A process for preparing high purity alumina from aluminium chloride hexahydrate solids. The process comprises digesting aluminium chloride hexahydrate solids having one or more inorganic impurities in hydrochloric acid to produce an aluminium chloride liquor, precipitating aluminium chloride hexahydrate solids from the liquor in one or more crystallisation stage(s) such that at least some of the inorganic impurities remains in the liquor, separating the precipitated aluminium chloride hexahydrate solids from the liquor to produce a hydrochloric acid process stream comprising the inorganic impurities, processing the separated aluminium chloride hexahydrate solids to form high purity alumina, optionally lowering the concentration of hydrogen chloride in the hydrochloric acid process stream, and removing at least some of the inorganic impurities from the hydrochloric acid process stream to produce a hydrochloric acid recycle stream which is recycled for use as the hydrochloric acid in the digestion step.
A process for preparing high purity alumina from aluminium-bearing materials is provided. The process digesting an aluminium bearing material to provide an aluminium chloride liquor, a first crystallisation vessel for crystallising aluminium chloride hexahydrate solids from the aluminium chloride liquor, optionally one or more subsequent crystallisation vessels for dissolving and recrystallising the aluminium chloride hexahydrate solids, and thermal treatment means for thermally treating the aluminium chloride hexahydrate solids to provide high purity alumina.
01 - Produits chimiques destinés à l'industrie, aux sciences ainsi qu'à l'agriculture
06 - Métaux communs et minerais; objets en métal
40 - Traitement de matériaux; recyclage, purification de l'air et traitement de l'eau
Produits et services
Alumina; Alumina fibre; Alumina trihydrate; Alumina (Aluminium oxide); Aluminium acetate; Aluminium alum; Aluminium chloride; Aluminium compounds; Aluminium halides; Aluminium hydrate; Aluminium silicate; Aluminium salts; Aluminium iodide; Bauxite; Activators to increase rate of chemical reaction; Chemical additives; Chemical additives for use in manufacture; Chemical additives for use in the casting of metals; Chemical additives for use in the moulding of metals; Chemical preparations for aiding water quality; Chemical preparations for forming coatings on metals; Chemical preparations for soil treatment; Chemical preparations for the binding of liquid waste; Chemical preparations for use in foundries; Chemical preparations for use in the manufacture of surface coatings; Chemical preparations for use in water treatment; Chemical products for use in foundry casting and tempering; Chemical products for use in metal processing; Chemical products for use in manufacturing; Chemical products for use in the extraction of minerals; Extraction chemicals; Chemical additives for use in industry; Chemical preparations for use in the metallurgical industry; Chemicals used in industry; Industrial chemicals; Chemical products for use in industry. Aluminium; Aluminium alloys; Aluminium discs; Aluminium doors; Aluminium foil; Aluminium foil paper laminates; Aluminium foils being packaging materials; Aluminium foils being wrapping materials; Aluminium framed modular platforms for use in theatres; Aluminium frames; Aluminium ladder rungs; Aluminium moulds; Aluminium profiles; Aluminium sheets; Aluminium slabs; Aluminium strips; Aluminium windows; Aluminium wire; Bauxite reinforced aluminium; Bauxite reinforced aluminium alloys; Building panels of aluminium; Ceramic reinforced aluminium; Ceramic reinforced aluminium alloys; Coated aluminium; Containers made of aluminium alloys (other than for household use); Extruded aluminium alloys; Extruded aluminium profiles; Extruded aluminium sections; Extrusions of aluminium; Roof flashings of aluminium; Prefabricated aluminium scaffolding frames. Metallurgical processing; Processing of minerals including bauxite; Processing of waste materials; Carbon offsetting services (recycling); Recycling; Recycling of metals; Recycling plants services; Chemical recycling of waste products; Refining; Refining services; Treatment of industrial waste; Metallurgical smelting; Alumina refining; Processing bauxite.
01 - Produits chimiques destinés à l'industrie, aux sciences ainsi qu'à l'agriculture
06 - Métaux communs et minerais; objets en métal
40 - Traitement de matériaux; recyclage, purification de l'air et traitement de l'eau
Produits et services
Alumina; alumina fibre; alumina trihydrate; alumina
(aluminium oxide); aluminium acetate; aluminium alum;
aluminium chloride; aluminium compounds; aluminium halides;
aluminium hydrate; aluminium silicate; aluminium salts;
aluminium iodide; bauxite; activators to increase rate of
chemical reaction; chemical additives; chemical additives
for use in manufacture; chemical additives for use in the
casting of metals; chemical additives for use in the
moulding of metals; chemical preparations for aiding water
quality; chemical preparations for forming coatings on
metals; chemical preparations for soil treatment; chemical
preparations for the binding of liquid waste; chemical
preparations for use in foundries; chemical preparations for
use in the manufacture of surface coatings; chemical
preparations for use in water treatment; chemical products
for use in foundry casting and tempering; chemical products
for use in metal processing; chemical products for use in
manufacturing; chemical products for use in the extraction
of minerals; extraction chemicals; chemical additives for
use in industry; chemical preparations for use in the
metallurgical industry; chemicals used in industry;
industrial chemicals; chemical products for use in industry. Aluminium; aluminium alloys; aluminium discs; aluminium
doors; aluminium foil; aluminium foil paper laminates;
aluminium foils being packaging materials; aluminium foils
being wrapping materials; aluminium framed modular platforms
for use in theatres; aluminium frames; aluminium ladder
rungs; aluminium moulds; aluminium profiles; aluminium
sheets; aluminium slabs; aluminium strips; aluminium
windows; aluminium wire; bauxite reinforced aluminium;
bauxite reinforced aluminium alloys; building panels of
aluminium; ceramic reinforced aluminium; ceramic reinforced
aluminium alloys; coated aluminium; containers made of
aluminium alloys (other than for household use); extruded
aluminium alloys; extruded aluminium profiles; extruded
aluminium sections; extrusions of aluminium; roof flashings
of aluminium; prefabricated aluminium scaffolding frames. Metallurgical processing; processing of materials;
processing of waste materials; carbon offsetting services
(recycling); recycling; recycling of metals; recycling
plants; chemical recycling of waste products; refining;
refining services; treatment of industrial waste;
metallurgical smelting.
01 - Produits chimiques destinés à l'industrie, aux sciences ainsi qu'à l'agriculture
06 - Métaux communs et minerais; objets en métal
40 - Traitement de matériaux; recyclage, purification de l'air et traitement de l'eau
Produits et services
Alumina; alumina fibre; alumina trihydrate; alumina (aluminium oxide); aluminium acetate; aluminium alum; aluminium chloride; aluminium compounds; aluminium halides; aluminium hydrate; aluminium silicate; aluminium salts; aluminium iodide; bauxite; activators to increase rate of chemical reaction; chemical additives; chemical additives for use in manufacture; chemical additives for use in the casting of metals; chemical additives for use in the moulding of metals; chemical preparations for aiding water quality; chemical preparations for forming coatings on metals; chemical preparations for soil treatment; chemical preparations for the binding of liquid waste; chemical preparations for use in foundries; chemical preparations for use in the manufacture of surface coatings; chemical preparations for use in water treatment; chemical products for use in foundry casting and tempering; chemical products for use in metal processing; chemical products for use in manufacturing; chemical products for use in the extraction of minerals; extraction chemicals; chemical additives for use in industry; chemical preparations for use in the metallurgical industry; chemicals used in industry; industrial chemicals; chemical products for use in industry Aluminium; aluminium alloys; aluminium discs; aluminium doors; aluminium foil; aluminium foil paper laminates; aluminium foils being packaging materials; aluminium foils being wrapping materials; aluminium framed modular platforms for use in theatres; aluminium frames; aluminium ladder rungs; aluminium moulds; aluminium profiles; aluminium sheets; aluminium slabs; aluminium strips; aluminium windows; aluminium wire; bauxite reinforced aluminium; bauxite reinforced aluminium alloys; building panels of aluminium; ceramic reinforced aluminium; ceramic reinforced aluminium alloys; coated aluminium; containers made of aluminium alloys (other than for household use); extruded aluminium alloys; extruded aluminium profiles; extruded aluminium sections; extrusions of aluminium; roof flashings of aluminium; prefabricated aluminium scaffolding frames Metallurgical processing; processing of materials; processing of waste materials; carbon offsetting services (recycling); recycling; recycling of metals; recycling plants; chemical recycling of waste products; refining; refining services; treatment of industrial waste; metallurgical smelting
01 - Produits chimiques destinés à l'industrie, aux sciences ainsi qu'à l'agriculture
06 - Métaux communs et minerais; objets en métal
40 - Traitement de matériaux; recyclage, purification de l'air et traitement de l'eau
Produits et services
(1) Alumina; alumina fibre; alumina trihydrate; alumina (aluminium oxide); aluminium acetate; aluminium alum; aluminium chloride; aluminium compounds; aluminium halides; aluminium hydrate; aluminium silicate; aluminium salts; aluminium iodide; bauxite; activators to increase rate of chemical reaction; chemical additives; chemical additives for use in manufacture; chemical additives for use in the casting of metals; chemical additives for use in the moulding of metals; chemical preparations for aiding water quality; chemical preparations for forming coatings on metals; chemical preparations for soil treatment; chemical preparations for the binding of liquid waste; chemical preparations for use in foundries; chemical preparations for use in the manufacture of surface coatings; chemical preparations for use in water treatment; chemical products for use in foundry casting and tempering; chemical products for use in metal processing; chemical products for use in manufacturing; chemical products for use in the extraction of minerals; extraction chemicals; chemical additives for use in industry; chemical preparations for use in the metallurgical industry; chemicals used in industry; industrial chemicals; chemical products for use in industry.
(2) Aluminium; aluminium alloys; aluminium discs; aluminium doors; aluminium foil; aluminium foil paper laminates; aluminium foils being packaging materials; aluminium foils being wrapping materials; aluminium framed modular platforms for use in theatres; aluminium frames; aluminium ladder rungs; aluminium moulds; aluminium profiles; aluminium sheets; aluminium slabs; aluminium strips; aluminium windows; aluminium wire; bauxite reinforced aluminium; bauxite reinforced aluminium alloys; building panels of aluminium; ceramic reinforced aluminium; ceramic reinforced aluminium alloys; coated aluminium; containers made of aluminium alloys (other than for household use); extruded aluminium alloys; extruded aluminium profiles; extruded aluminium sections; extrusions of aluminium; roof flashings of aluminium; prefabricated aluminium scaffolding frames. (1) Metallurgical processing; processing of materials; processing of waste materials; carbon offsetting services (recycling); recycling; recycling of metals; recycling plants; chemical recycling of waste products; refining; refining services; treatment of industrial waste; metallurgical smelting.
A method for calcination of hydrated alumina, the method comprising the steps of: heating the hydrated alumina in a dehydrating zone to reduce the water content of the hydrated alumina and provide partially calcined alumina; and heating the partially calcined alumina in a calcining zone to provide alumina, wherein the step of heating the hydrated alumina in a dehydrating zone uses at least in part, stored thermal energy, electrical energy, renewable energy or nuclear energy including combinations thereof and the step of heating the partially calcined alumina in a calcining zone uses at least in part, electrical energy or chemical potential energy including combinations thereof, and where the hydrated alumina is heated at least in part with stored thermal energy, the method is alternately operable in a thermal energy charging state and in a thermal energy discharging state.
C01F 7/44 - Déshydratation de l’oxyde ou de l'hydroxyde d'aluminium, c. à d. toutes les conversions d'une forme en une autre impliquant une perte d’eau
A process for preparing high purity alumina from aluminium-bearing materials is provided. The process digesting an aluminium bearing material to provide an aluminium chloride liquor, a first crystallisation vessel for crystallising aluminium chloride hexahydrate solids from the aluminium chloride liquor, optionally one or more subsequent crystallisation vessels for dissolving and recrystallising the aluminium chloride hexahydrate solids, and thermal treatment means for thermally treating the aluminium chloride hexahydrate solids to provide high purity alumina.
C01F 7/22 - Préparation de l'oxyde ou de l'hydroxyde d'aluminium à partir de minerais alumineux à l'aide d'acides ou de sels à l'aide d'halogénures ou d’acides halogénés
C01F 7/306 - Décomposition thermique de chlorures hydratés, p.ex. du trichlorure d'aluminium hexahydraté
A process for preparing high purity alumina from aluminium-bearing materials originating from the Bayer process. The process comprising digesting the aluminium-bearing materials with hydrochloric acid to produce an aluminium chloride liquor and acid-insoluble solids and separating said solids from the aluminium chloride liquor, depleting the aluminium chloride liquor of one or more impurities, producing aluminium chloride hexahydrate solids from the produced aluminium chloride liquor, and thermally decomposing the produced aluminium chloride hexahydrate solids to produce high purity alumina.
A method for controlling the carbon output from an alumina refinery, the method comprising the steps of capturing water vapour from a flash train in the refinery, compressing the captured water vapour and utilising at least a portion of the energy in the captured water vapour to heat a process stream within the alumina refinery.
C01F 7/06 - Préparation des aluminates de métaux alcalins; Oxyde ou hydroxyde d'aluminium obtenus à partir de ceux-ci par traitement de minéraux alumineux ou de matières premières assimilables à des déchets avec de l'hydroxyde alcalin, p.ex. par lixiviation de la bauxite selon le procédé Bayer
C01F 7/14 - Oxyde ou hydroxyde d'aluminium obtenus à partir d'aluminates de métaux alcalins
F28D 21/00 - Appareils échangeurs de chaleur non couverts par l'un des groupes
A fertilizer composition comprising an ammonium nitrate material and an effective amount of a stabilizer material to result in a specific impulse reduction of at least 10% when compared the specific impulse of a commercially available ammonium nitrate composition. The stabilizer material may comprise huntite or magnesite. In one embodiment, stabilizer material is about 10 to about 25 wt. % of the total fertilizer composition.
A process for preparing high purity alumina from aluminium-bearing materials originating from the Bayer process. The process comprising digesting the aluminium-bearing materials with hydrochloric acid to produce an aluminium chloride liquor and acid-insoluble solids and separating said solids from the aluminium chloride liquor, depleting the aluminium chloride liquor of one or more impurities, producing aluminium chloride hexahydrate solids from the produced aluminium chloride liquor, and thermally decomposing the produced aluminium chloride hexahydrate solids to produce high purity alumina.
C22B 7/00 - Mise en œuvre de matériaux autres que des minerais, p.ex. des rognures, pour produire des métaux non ferreux ou leurs composés
C01F 7/22 - Préparation de l'oxyde ou de l'hydroxyde d'aluminium à partir de minerais alumineux à l'aide d'acides ou de sels à l'aide d'halogénures ou d’acides halogénés
C01F 7/30 - Préparation de l'oxyde ou de l'hydroxyde d'aluminium par décomposition thermique ou par hydrolyse ou oxydation de composés de l'aluminium
C01F 7/46 - Purification de l'oxyde d'aluminium, de l'hydroxyde d'aluminium ou des aluminates
A process for preparing high purity alumina from aluminium-bearing materials originating from the Bayer process. The process comprising digesting the aluminium-bearing materials with hydrochloric acid to produce an aluminium chloride liquor and acid-insoluble solids and separating said solids from the aluminium chloride liquor, depleting the aluminium chloride liquor of one or more impurities, producing aluminium chloride hexahydrate solids from the produced aluminium chloride liquor, and thermally decomposing the produced aluminium chloride hexahydrate solids to produce high purity alumina.
C01F 7/22 - Préparation de l'oxyde ou de l'hydroxyde d'aluminium à partir de minerais alumineux à l'aide d'acides ou de sels à l'aide d'halogénures ou d’acides halogénés
C01F 7/46 - Purification de l'oxyde d'aluminium, de l'hydroxyde d'aluminium ou des aluminates
A fluid sampling device for sampling fluids in a fluid process vessel through a port in a wall of the vessel, the sampling device comprising a flexible tube with an open end in fluid communication with the fluid process vessel, means to attach the sampling device to the process vessel, wherein at least a portion of the flexible tube is adapted to extend into the process vessel, wherein the length of the flexible tube extending into the process vessel is at least 5 times the outer diameter of the flexible tube.
A fertilizer composition comprising an ammonium nitrate material; and an effective amount of a stabilizer material to result in a specific impulse reduction of at least 10 % when compared the specific impulse of a commercially available ammonium nitrate composition; wherein the stabilizer material comprises huntite and wherein the stabilizer material is about 10 to about 25 wt. % of the total fertilizer composition.
A fertilizer composition comprising an ammonium nitrate material; and an effective amount of a stabilizer material to result in a specific impulse reduction of at least 10 % when compared the specific impulse of a commercially available ammonium nitrate composition; wherein the stabilizer material comprises huntite and wherein the stabilizer material is about 10 to about 25 wt. % of the total fertilizer composition.
A method for controlling the concentration of impurities in Bayer liquors, the method comprising the steps of adding an oxide and/or a hydroxide of a metal other than aluminium to a Bayer liquor with a desired TA; forming a layered double hydroxide; and incorporating at least one impurity in said layered double hydroxide, wherein the impurities are selected from the group comprising phosphorus, vanadium and silicon.
B01J 20/04 - Compositions absorbantes ou adsorbantes solides ou compositions facilitant la filtration; Absorbants ou adsorbants pour la chromatographie; Procédés pour leur préparation, régénération ou réactivation contenant une substance inorganique contenant des composés des métaux alcalins, des métaux alcalino-terreux ou du magnésium
B01J 20/08 - Compositions absorbantes ou adsorbantes solides ou compositions facilitant la filtration; Absorbants ou adsorbants pour la chromatographie; Procédés pour leur préparation, régénération ou réactivation contenant une substance inorganique contenant des oxydes ou des hydroxydes des métaux non prévus dans le groupe contenant de la bauxite
B01J 20/28 - Compositions absorbantes ou adsorbantes solides ou compositions facilitant la filtration; Absorbants ou adsorbants pour la chromatographie; Procédés pour leur préparation, régénération ou réactivation caractérisées par leur forme ou leurs propriétés physiques
A method for controlling the concentration of impurities in Bayer liquors, the method comprising the steps of adding an oxide and/or a hydroxide of a metal other than aluminium to a Bayer liquor with a desired TA forming a layered double hydroxide; and incorporating at least one impurity in said layered double hydroxide, wherein the impurities are selected from the group comprising chloride, fluoride, sulfate and TOC.
B01J 20/04 - Compositions absorbantes ou adsorbantes solides ou compositions facilitant la filtration; Absorbants ou adsorbants pour la chromatographie; Procédés pour leur préparation, régénération ou réactivation contenant une substance inorganique contenant des composés des métaux alcalins, des métaux alcalino-terreux ou du magnésium
B01J 20/08 - Compositions absorbantes ou adsorbantes solides ou compositions facilitant la filtration; Absorbants ou adsorbants pour la chromatographie; Procédés pour leur préparation, régénération ou réactivation contenant une substance inorganique contenant des oxydes ou des hydroxydes des métaux non prévus dans le groupe contenant de la bauxite
B01J 20/28 - Compositions absorbantes ou adsorbantes solides ou compositions facilitant la filtration; Absorbants ou adsorbants pour la chromatographie; Procédés pour leur préparation, régénération ou réactivation caractérisées par leur forme ou leurs propriétés physiques
19.
METHOD FOR CONTROLLING THE CONCENTRATION OF IMPURITIES IN BAYER LIQUORS
A method for controlling the concentration of impurities in Bayer liquors, the method comprising the steps of adding an oxide and/or a hydroxide of a metal other than aluminium to a Bayer liquor with a desired TA; forming a layered double hydroxide; and incorporating at least one impurity in said layered double hydroxide, wherein the impurities are selected from the group comprising phosphorus, vanadium and silicon.
C01F 7/47 - Purification de l'oxyde d'aluminium, de l'hydroxyde d'aluminium ou des aluminates des aluminates, p.ex. l'élimination des composés de Si, Fe, Ga ou des composés organiques des liqueurs issues du procédé Bayer
B01J 20/04 - Compositions absorbantes ou adsorbantes solides ou compositions facilitant la filtration; Absorbants ou adsorbants pour la chromatographie; Procédés pour leur préparation, régénération ou réactivation contenant une substance inorganique contenant des composés des métaux alcalins, des métaux alcalino-terreux ou du magnésium
B01J 20/08 - Compositions absorbantes ou adsorbantes solides ou compositions facilitant la filtration; Absorbants ou adsorbants pour la chromatographie; Procédés pour leur préparation, régénération ou réactivation contenant une substance inorganique contenant des oxydes ou des hydroxydes des métaux non prévus dans le groupe contenant de la bauxite
B01J 20/28 - Compositions absorbantes ou adsorbantes solides ou compositions facilitant la filtration; Absorbants ou adsorbants pour la chromatographie; Procédés pour leur préparation, régénération ou réactivation caractérisées par leur forme ou leurs propriétés physiques
A method for controlling the concentration of impurities in Bayer liquors, the method comprising the steps of adding an oxide and/or a hydroxide of a metal other than aluminium to a Bayer liquor with a desired TA forming a layered double hydroxide; and incorporating at least one impurity in said layered double hydroxide, wherein the impurities are selected from the group comprising chloride, fluoride, sulfate and TOC.
C01F 7/47 - Purification de l'oxyde d'aluminium, de l'hydroxyde d'aluminium ou des aluminates des aluminates, p.ex. l'élimination des composés de Si, Fe, Ga ou des composés organiques des liqueurs issues du procédé Bayer
B01J 20/04 - Compositions absorbantes ou adsorbantes solides ou compositions facilitant la filtration; Absorbants ou adsorbants pour la chromatographie; Procédés pour leur préparation, régénération ou réactivation contenant une substance inorganique contenant des composés des métaux alcalins, des métaux alcalino-terreux ou du magnésium
B01J 20/08 - Compositions absorbantes ou adsorbantes solides ou compositions facilitant la filtration; Absorbants ou adsorbants pour la chromatographie; Procédés pour leur préparation, régénération ou réactivation contenant une substance inorganique contenant des oxydes ou des hydroxydes des métaux non prévus dans le groupe contenant de la bauxite
B01J 20/28 - Compositions absorbantes ou adsorbantes solides ou compositions facilitant la filtration; Absorbants ou adsorbants pour la chromatographie; Procédés pour leur préparation, régénération ou réactivation caractérisées par leur forme ou leurs propriétés physiques
A fluid sampling device for sampling fluids in a fluid process vessel through a port in a wall of the vessel, the sampling device comprising a flexible tube with an open end in fluid communication with the fluid process vessel, means to attach the sampling device to the process vessel, wherein at least a portion of the flexible tube is adapted to extend into the process vessel, wherein the length of the flexible tube extending into the process vessel is at least 5 times the outer diameter of the flexible tube.
A fluid sampling device for sampling fluids in a fluid process vessel through a port in a wall of the vessel, the sampling device comprising a flexible tube with an open end in fluid communication with the fluid process vessel, means to attach the sampling device to the process vessel, wherein at least a portion of the flexible tube is adapted to extend into the process vessel, wherein the length of the flexible tube extending into the process vessel is at least 5 times the outer diameter of the flexible tube.
An online sampling device comprising: a sampler; an analyser; a delay member; and ancillary equipment, wherein the delay member is downstream from the analyser and is adapted to inhibit exposure of a sample to the ancillary equipment and the ancillary equipment employs a sample removal fluid to remove sample from the device.
Methods, and related products and compositions, of increasing the stability of a Bayer process liquor are described. A method of increasing the stability of a Bayer process liquor includes contacting the Bayer process liquor with a ppm quantity of a low molecular weight dextran. Also described are methods, and related products and compositions, for controlling the precipitation of aluminum-containing compounds from a Bayer process liquor.
C01F 7/06 - Préparation des aluminates de métaux alcalins; Oxyde ou hydroxyde d'aluminium obtenus à partir de ceux-ci par traitement de minéraux alumineux ou de matières premières assimilables à des déchets avec de l'hydroxyde alcalin, p.ex. par lixiviation de la bauxite selon le procédé Bayer
C01F 7/04 - Préparation des aluminates de métaux alcalins; Oxyde ou hydroxyde d'aluminium obtenus à partir de ceux-ci
C01F 7/14 - Oxyde ou hydroxyde d'aluminium obtenus à partir d'aluminates de métaux alcalins
C01F 7/47 - Purification de l'oxyde d'aluminium, de l'hydroxyde d'aluminium ou des aluminates des aluminates, p.ex. l'élimination des composés de Si, Fe, Ga ou des composés organiques des liqueurs issues du procédé Bayer
A method for controlling mercury emissions from aqueous alkaline solutions from the Bayer circuit, the method comprising the steps of: introducing a source of copper ions to an aqueous alkaline solution containing sulfide ions; precipitating a copper species; and precipitating a mercury species; thereby facilitating mercury removal from the aqueous alkaline solution.
C01F 7/06 - Préparation des aluminates de métaux alcalins; Oxyde ou hydroxyde d'aluminium obtenus à partir de ceux-ci par traitement de minéraux alumineux ou de matières premières assimilables à des déchets avec de l'hydroxyde alcalin, p.ex. par lixiviation de la bauxite selon le procédé Bayer
26.
PROCESS FOR THE DESTRUCTION OF ORGANICS IN BAYER PROCESS STREAMS
A process for the destruction of organics in a Bayer process stream, the process comprising the steps of: a) Passing a volume of a Bayer process stream to a reactor vessel in which is provided a population of a mixed bacterial culture; and b) Retaining that volume of the Bayer process stream in the reactor vessel for a period of time during which at least 10% by mass as carbon of the organic compounds destroyed originate from non-oxalate organic compounds, wherein the mixed bacterial culture comprises a mix of bacterial species capable of destroying organics and which has previously been adapted to the Bayer process stream, or a stream of substantially similar composition, prior to introduction to the reactor vessel.
Odorant from a process stream is removed by passing the stream (18) to a counter-current contacting device (12) for stripping odorants. The odorants passes from the contacting device (12) as contaminated steam (26) while the remaining process stream passes directly to a “tube side” of a falling film evaporator (14) and is heated producing steam that passes into the counter-current contacting device (12) to strip that process stream and produce the contaminated steam (26). This contaminated steam from the contacting device (12) passes through a vapor compression step (16) from which it is introduced into a “shell side” of the falling film evaporator (14) and in which it heats the process stream passing from the contacting device (12) into the evaporator (14). The contaminated steam that is not condensed in the falling film evaporator passes as a low flow vent gas (50) in which the odorants have been concentrated.
A method of increasing the stability of a Bayer process liquor, the method comprising at least the step of: contacting the Bayer process liquor with a ppm quantity of a low molecular weight dextran. Also described is a method for controlling the precipitation of aluminium- containing compounds from a Bayer process liquor.
C01F 7/06 - Préparation des aluminates de métaux alcalins; Oxyde ou hydroxyde d'aluminium obtenus à partir de ceux-ci par traitement de minéraux alumineux ou de matières premières assimilables à des déchets avec de l'hydroxyde alcalin, p.ex. par lixiviation de la bauxite selon le procédé Bayer
Odorant from a process stream is removed by passing the stream (18) to a counter-current contacting device (12) for stripping odorants. The odorants passes from the contacting device (12) as contaminated steam (26) whilst the remaining process stream passes directly to a "tube side" of a falling film evaporator (14) and is heated producing steam that passes into the counter-current contacting device (12) to strip that process stream and produce the contaminated steam (26). This contaminated steam from the contacting device (12) passes through a vapour compression step (16) from which it is introduced into a "shell side" of the falling film evaporator (14) and in which it heats the process stream passing from the contacting device (12) into the evaporator (14). The contaminated steam that is not condensed in the falling film evaporator passes as a low flow vent gas (50) in which the odorants have been concentrated.
Odorant from a process stream is removed by passing the stream (18) to a counter-current contacting device (12) for stripping odorants. The odorants passes from the contacting device (12) as contaminated steam (26) whilst the remaining process stream passes directly to a "tube side" of a falling film evaporator (14) and is heated producing steam that passes into the counter-current contacting device (12) to strip that process stream and produce the contaminated steam (26). This contaminated steam from the contacting device (12) passes through a vapour compression step (16) from which it is introduced into a "shell side" of the falling film evaporator (14) and in which it heats the process stream passing from the contacting device (12) into the evaporator (14). The contaminated steam that is not condensed in the falling film evaporator passes as a low flow vent gas (50) in which the odorants have been concentrated.
A drilling apparatus (100) for clearing of a blockage in a tapping point on a pipeline or vessel under pressure. The drilling apparatus (100) may also be used for installation of a tapping point on a pipeline or vessel under pressure. The drilling apparatus (100) comprises a body (11) adapted for connection to the tapping point. The body (11) defines an internal passage (18) through which a drill shaft (41) can be advanced to the tapping point for clearing the blockage therein. The drilling apparatus (100) further comprises a first drive means (51) for rotating the drill shaft (41) to perform a drilling operation and a second drive means (52) for moving the first drive means (51) to cause axial movement of the drill shaft (41). The drilling apparatus (100) further comprises a control means (not shown) operable remotely to selectively control operation of the first drive means (51) and the second drive means (52). The body (11) has provision to allow the drill shaft (41) to penetrate the tapping point while isolating the fluid contents under pressure within the pipeline or vessel.
B23B 41/08 - Machines ou dispositifs à aléser ou à percer spécialement adaptés à un travail particulier; Accessoires spécialement conçus à cet effet pour aléser, percer ou tarauder des trous dans des tubes sous pression
B23B 47/20 - Entraînements; Transmissions pour l'avance ou le retour de l'outil ou de la pièce principalement par l'énergie électrique
F16L 41/04 - Installation de prises de branchement sur les parois de tuyaux, c. à d. établissement de dérivations sur tuyaux pendant qu'ils transportent des fluides; Accessoires à cet effet
A method for concentrating spent Bayer process liquor, the method comprising the steps of: Passing at least a portion of a calciner flue gas to a separator to provide a dehydrated gas stream and a water vapour enriched stream Contacting the spent Bayer process liquor with the water vapour enriched stream; and Evaporating water from the spent Bayer process liquor, thereby concentrating the spent Bayer process liquor.
A method for precipitating boehmite from a pre-precipitation Bayer liquor, the method comprising the steps of: treating the pre-precipitation liquor to decrease both the total caustic concentration and the total alkalinity of the pre-precipitation liquor; and pre-precipitating boehmite from the treated pre-precipitation liquor, wherein at least a portion of the boehmite is precipitated at a temperature of at least 105 °C.
C01F 7/06 - Préparation des aluminates de métaux alcalins; Oxyde ou hydroxyde d'aluminium obtenus à partir de ceux-ci par traitement de minéraux alumineux ou de matières premières assimilables à des déchets avec de l'hydroxyde alcalin, p.ex. par lixiviation de la bauxite selon le procédé Bayer
C01F 7/14 - Oxyde ou hydroxyde d'aluminium obtenus à partir d'aluminates de métaux alcalins
34.
METHOD FOR CONTROLLING THE PRECIPITATION OF ALUMINA
A method for controlling the precipitation of alumina from a Bayer process solution, the method comprising the steps of: contacting the Bayer process solution with a solid support comprising an extractant, wherein the solid support is substantially water insoluble; removing sodium ions from the Bayer process solution; reducing the concentration of hydroxide ions in the Bayer process solution; and precipitating alumina in the Bayer process solution.
C01F 7/47 - Purification de l'oxyde d'aluminium, de l'hydroxyde d'aluminium ou des aluminates des aluminates, p.ex. l'élimination des composés de Si, Fe, Ga ou des composés organiques des liqueurs issues du procédé Bayer
35.
ELECTROLYTIC METHOD FOR CONTROLLING THE PRECIPITATION OF ALUMINA
A method for controlling the precipitation of alumina from a Bayer process solution, the method comprising the steps of: applying a potential between a first region comprising a Bayer process liquor and a second region comprising a caustic solution, wherein an ion permeable membrane is provided between the first region and the second region; and causing transfer of an ion across the ion permeable membrane from one region to the other region, wherein the Bayer process liquor is not directed to the second region.
A method for preparing aluminium oxide from a Bayer process solution, the method comprising the steps of: precipitating a first alumina product and providing a first spent liquor; separating at least a portion of the first alumina product and the first spent liquor; treating at least a portion of the first spent liquor to decrease both the total caustic concentration and the total alkalinity of the treated first spent liquor; precipitating a second alumina product from the treated first spent liquor and providing a second spent liquor; separating at least a portion of the second alumina product and the second spent liquor; calcining at least a portion of the first alumina product in a calciner; and calcining at least a portion of the second alumina product in the calciner, wherein the first alumina product is gibbsite or boehmite, or a combination thereof and the second alumina product is gibbsite or boehmite, or a combination thereof.
C01F 7/06 - Préparation des aluminates de métaux alcalins; Oxyde ou hydroxyde d'aluminium obtenus à partir de ceux-ci par traitement de minéraux alumineux ou de matières premières assimilables à des déchets avec de l'hydroxyde alcalin, p.ex. par lixiviation de la bauxite selon le procédé Bayer
C01F 7/34 - Préparation de l'hydroxyde d'aluminium par précipitation à partir de solutions contenant des sels d'aluminium
C01F 7/46 - Purification de l'oxyde d'aluminium, de l'hydroxyde d'aluminium ou des aluminates
A method for precipitating boehmite from a Bayer process solution, the method comprising the steps of: treating at least a portion of a first spent liquor to decrease both the total caustic concentration and the total alkalinity of the liquor; combining at least a portion of the treated spent liquor with at least a portion of a green liquor; precipitating boehmite from the combination of the green liquor and the treated spent liquor and producing a second spent liquor; and separating at least a portion of the boehmite and the second spent liquor.
C01F 7/06 - Préparation des aluminates de métaux alcalins; Oxyde ou hydroxyde d'aluminium obtenus à partir de ceux-ci par traitement de minéraux alumineux ou de matières premières assimilables à des déchets avec de l'hydroxyde alcalin, p.ex. par lixiviation de la bauxite selon le procédé Bayer
C01F 7/14 - Oxyde ou hydroxyde d'aluminium obtenus à partir d'aluminates de métaux alcalins
A method for the treatment of contaminants in an aqueous stream, the method comprising the steps of: decreasing the pH of the aqueous stream; passing at least a portion of the aqueous stream through a membrane; separating the aqueous stream into a permeate and a retentate; air stripping of at least a portion of the retentate to reduce the odour of the retentate.
A torque reaction mechanism comprising a coupling arrangement (170) operable between an apparatus (10) having a rotary drive input (120) such as a drive socket, and a powered driving tool (160) for delivering rotational torque to the rotary drive input (120). The coupling arrangement (170) acts to transfer reaction torque away from the operator of the powered driving tool (160). The coupling arrangement (170) comprises a first (fixed) coupling element (171) disposed around the rotary drive input (120), and a second (corresponding) coupling element (172) on the powered driving tool 160. The arrangement is such that cooperation between the two coupling elements (171, 172) is adapted to allow displacement therebetween in the direction corresponding to the axis of rotation of the driving tool (160) while constraining the two coupling elements against relative rotation about the axis of rotation. With this arrangement, reaction torque arising from operation of the powered driving tool (160) is transferred through the coupling element (172) on the tool (160) to the respective fixed coupling element (171). In this way, an operator holding the powered driving tool (160) merely has to guide the tool during its operation and does not have to counteract any reaction torque. The first coupling element (171) is configured as a sleeve (175) disposed around the rotary drive input (120). The second coupling element 172 is configured as a block (177) which is rigidly mounted on the body (163) of the driving tool (160) and which is adapted to be received in the sleeve (175) for sliding movement therealong.
B25B 33/00 - Outils à main non couverts par l'un des groupes de la présente sous-classe
F16D 3/06 - Accouplements extensibles, c. à d. avec moyens permettant le mouvement entre parties accouplées durant leur entraînement adaptés à des fonctions particulières spécialement adaptés pour permettre un déplacement axial
B25B 21/02 - Outils portatifs à moteur pour serrer ou desserrer les vis ou les écrous; Accessoires pour appareils à percer ayant les mêmes buts avec des moyens pour communiquer un choc à la tige du tournevis ou à la douille de la clé à écrou
B25F 3/00 - Associations d'outils pour différents travaux avec un seul moyen d'entraînement mécanique portatif; Raccords appropriés
An operating mechanism (40) for a valve (11) having a valve body (13) defining a valve seat (19) and a valve member (21) moveable into and out of engagement with the valve seat (19). The valve member (21) comprises a valve disc (25), a valve stem (23), and a bush (29) through which the valve stem (23) extends in threaded engagement therewith whereby relative rotation between the bush (29) and the valve stem (23) causes axial displacement of the valve stem (23) relative to the bush (29). The operating mechanism (40) comprises two operating drive sockets (104, 106) in opposed relation, each of which is drivingly connected to the bush (29). The operating mechanism (40) also comprises two unlocking drive sockets (118, 120) in opposed relation, each of which is drivingly connected to the bush (29). The drive ratio between the operating drive sockets (104, 106) and the bush (29), and the drive ratio between the unlocking drive sockets (118, 120) and the bush (29) are different from each other such that a larger torque is delivered to the bush (29) from operation of either one of the unlocking drive sockets (118, 120) in comparison to the torque delivered to the bush (29) from operation of the either one of the operating drive sockets (104, 106) for the same torque input. With this arrangement, either one of the unlocking drive sockets (118, 120) can be used for unlocking the valve; that is, to move the valve member (21) into a 'just open' or throttled position in which the valve disc (25) is out of sealing engagement with the valve seat (19) without rotation of the valve stem (23). Further, either one of the operating drive sockets (104, 106) can be used for opening and closing the valve (11), as well as valve locking. Because there are two operating drive sockets (104, 106) in opposed relation, and also two unlocking drive sockets (118, 120) also in opposed relation, an operator can access the operating mechanism (40) from either side thereof according to what is more convenient.
F16K 1/02 - Soupapes ou clapets, c. à d. dispositifs obturateurs dont l'élément de fermeture possède au moins une composante du mouvement d'ouverture ou de fermeture perpendiculaire à la surface d'obturation à tige filetée
F16K 1/04 - Soupapes ou clapets, c. à d. dispositifs obturateurs dont l'élément de fermeture possède au moins une composante du mouvement d'ouverture ou de fermeture perpendiculaire à la surface d'obturation à tige filetée et dont l'élément de fermeture fait corps avec la tige, p.ex. soupapes principales
F16K 1/32 - Soupapes ou clapets, c. à d. dispositifs obturateurs dont l'élément de fermeture possède au moins une composante du mouvement d'ouverture ou de fermeture perpendiculaire à la surface d'obturation - Détails
F16K 31/00 - Moyens de fonctionnement; Dispositifs de retour à la position de repos
E03B 7/00 - Canalisations principales ou réseaux de distribution
E03B 9/00 - Procédés ou installations de soutirage d'eau
E03B 7/02 - Réseaux de canalisations publiques ou autres canalisations maîtresses analogues
A method for the calcination of aluminium trihydroxide, the method comprising the steps of: directly contacting the aluminium trihydroxide with steam; and calcining at least a portion of the aluminium trihydroxide to alumina and/or aluminium oxyhydroxide.
C01F 7/44 - Déshydratation de l’oxyde ou de l'hydroxyde d'aluminium, c. à d. toutes les conversions d'une forme en une autre impliquant une perte d’eau
C01F 7/30 - Préparation de l'oxyde ou de l'hydroxyde d'aluminium par décomposition thermique ou par hydrolyse ou oxydation de composés de l'aluminium
A method for concentrating spent Bayer process liquor, the method comprising the steps of: recovering heat from a Bayer process calciner flue gas; applying at least a portion of the recovered heat to the spent Bayer process liquor; and evaporating water from the spent Bayer process liquor, thereby concentrating the spent Bayer process liquor.
C01F 7/04 - Préparation des aluminates de métaux alcalins; Oxyde ou hydroxyde d'aluminium obtenus à partir de ceux-ci
F28D 15/02 - Appareils échangeurs de chaleur dans lesquels l'agent intermédiaire de transfert de chaleur en tubes fermés passe dans ou à travers les parois des canalisations dans lesquels l'agent se condense et s'évapore, p.ex. tubes caloporteurs
43.
METHOD FOR MANAGEMENT OF CONTAMINANTS IN ALKALINE PROCESS LIQUORS
A method for the management of contaminants in an alkaline process circuit, the method including the steps of: adding a source of silica to an alkaline process liquor from the alkaline process circuit; adding a source of alumina to the alkaline process liquor; and forming a geopolymer.
C01F 7/34 - Préparation de l'hydroxyde d'aluminium par précipitation à partir de solutions contenant des sels d'aluminium
C01F 7/46 - Purification de l'oxyde d'aluminium, de l'hydroxyde d'aluminium ou des aluminates
C01F 7/47 - Purification de l'oxyde d'aluminium, de l'hydroxyde d'aluminium ou des aluminates des aluminates, p.ex. l'élimination des composés de Si, Fe, Ga ou des composés organiques des liqueurs issues du procédé Bayer
C01B 33/12 - Silice; Ses hydrates, p.ex. acide silicique lépidoïque
C01B 33/14 - Silice colloïdale, p.ex. sous forme de dispersions, gels, sols
A method of reducing the calcia concentration of a green Bayer process liquor containing calcia and phosphate, the method comprising the step of: contacting the green Bayer process liquor with a quantity of apatite; thereby inducing the precipitation of further apatite and reducing the calcia concentration of the green Bayer process liquor.
C01F 7/04 - Préparation des aluminates de métaux alcalins; Oxyde ou hydroxyde d'aluminium obtenus à partir de ceux-ci
C01F 7/06 - Préparation des aluminates de métaux alcalins; Oxyde ou hydroxyde d'aluminium obtenus à partir de ceux-ci par traitement de minéraux alumineux ou de matières premières assimilables à des déchets avec de l'hydroxyde alcalin, p.ex. par lixiviation de la bauxite selon le procédé Bayer
C01F 7/46 - Purification de l'oxyde d'aluminium, de l'hydroxyde d'aluminium ou des aluminates
45.
METHOD FOR CONTROLLING THE PRECIPITATION OF ALUMINA
A method for controlling the precipitation of alumina from Bayer process solutions, the method comprising the steps of: contacting the Bayer process solution with a substantially water- immiscible solution comprising an extractant; extracting at least a portion of the metal cations present in the Bayer process solution into the substantially water-immiscible solution; thereby reducing the concentration of hydroxide ions in the Bayer process solution.
C01F 7/34 - Préparation de l'hydroxyde d'aluminium par précipitation à partir de solutions contenant des sels d'aluminium
C01F 7/47 - Purification de l'oxyde d'aluminium, de l'hydroxyde d'aluminium ou des aluminates des aluminates, p.ex. l'élimination des composés de Si, Fe, Ga ou des composés organiques des liqueurs issues du procédé Bayer
A method for the biodegradation of organic compounds in a Bayer circuit, the method including the steps of: treating a portion of the Bayer circuit to provide a pH of between about 8 and about 12 wherein the portion of the Bayer circuit comprises an alkaliphilic microorganism and an electron acceptor and the microorganism is capable of anaerobic respiration in the presence of the electron acceptor, such that at least a portion of the organic compounds are anaerobically degraded by the microorganism.
C01F 7/47 - Purification de l'oxyde d'aluminium, de l'hydroxyde d'aluminium ou des aluminates des aluminates, p.ex. l'élimination des composés de Si, Fe, Ga ou des composés organiques des liqueurs issues du procédé Bayer
C22B 3/18 - Extraction de composés métalliques par voie humide à partir de minerais ou de concentrés à l'aide de micro-organismes ou d'enzymes, p.ex. de bactéries ou d'algues
A centrifugal pump seal assembly (10) for forming a seal between an impeller (12) and its casing (14), the seal assembly (10) comprising at least one sealing member (20) supported on the casing (14) and being capable of movement to a position at which it sealingly contacts the impeller (14), the movement of the sealing member (20) being actuated by fluid pressure generated at the outlet side (18) of the casing (14), and wherein the seal is maintained by the continual fluid pressure applied to the sealing member (14) when the pump is in use.
Apparatus (10) for use with a valve (11) to perform a grinding operation on the valve. The valve (11) has a valve body (13) defining a valve seat (19) and a valve member (21) moveable into and out of engagement with the valve seat (19). The valve member (21) comprises a valve disc (25) and a valve stem (23). The valve (11) also has a bush (29) through which the valve stem (23) extends in threaded engagement therewith whereby relative rotation between the bush (29) and the valve stem (23) causes axial displacement of the valve stem (23) relative to the bush (29). The apparatus (10) comprises a drive transmission means (55) for providing a driving connection to the bush (29) and the valve stem (23). The drive transmission means (55) has first and second modes of operation, wherein in the first mode of operation the drive transmission means causes the bush (29) to rotate with the valve stem (23) such that the valve stem rotates without undergoing axial movement and wherein in the second mode of operation the drive transmission means (55) causes relative rotation between the bush (29) and the valve stem (23) such that the valve stem undergoes axial movement while rotating. The apparatus (10) has means including hand wheel (245) for selectively causing the drive transmission means (55) to operate in either one of the first and second modes of operation during rotation of the valve stem (23).
F16K 29/00 - Dispositions pour le mouvement des corps de soupapes autre que celui d'ouverture ou de fermeture de la soupape, p.ex. pour le rodage, pour empêcher le gommage
F16K 1/24 - Soupapes ou clapets, c. à d. dispositifs obturateurs dont l'élément de fermeture possède au moins une composante du mouvement d'ouverture ou de fermeture perpendiculaire à la surface d'obturation dont le corps de soupape est initialement soulevé de son siège à l'ouverture et tourne ensuite autour d'un axe parallèle au siège
F16K 1/50 - Dispositifs empêchant la rotation des corps de soupapes
F16K 1/02 - Soupapes ou clapets, c. à d. dispositifs obturateurs dont l'élément de fermeture possède au moins une composante du mouvement d'ouverture ou de fermeture perpendiculaire à la surface d'obturation à tige filetée
F16K 1/32 - Soupapes ou clapets, c. à d. dispositifs obturateurs dont l'élément de fermeture possède au moins une composante du mouvement d'ouverture ou de fermeture perpendiculaire à la surface d'obturation - Détails
F16K 31/04 - Moyens de fonctionnement; Dispositifs de retour à la position de repos magnétiques utilisant un moteur
F16K 1/04 - Soupapes ou clapets, c. à d. dispositifs obturateurs dont l'élément de fermeture possède au moins une composante du mouvement d'ouverture ou de fermeture perpendiculaire à la surface d'obturation à tige filetée et dont l'élément de fermeture fait corps avec la tige, p.ex. soupapes principales
F16K 31/05 - Moyens de fonctionnement; Dispositifs de retour à la position de repos magnétiques utilisant un moteur spécialement conçus pour manœuvrer les soupapes à fonctionnement manuel ou pour la manœuvre conjuguée au moteur et à la main
An operating mechanism (10) for a valve (11). The valve (11) has a valve body (13) defining a valve seat (19) and a valve member (21) moveable into and out of engagement with the valve seat (19). The valve member (21) comprises a valve disc (25) and a valve stem (23). The valve (11) also has a bush (29) through which the valve stem (23) extends in threaded engagement therewith whereby relative rotation between the bush (29) and the valve stem (23) causes axial displacement of the valve stem (23) relative to the bush (29). The apparatus (10) comprises a locking drive input (109) and an unlocking drive input (119), each of which is drivingly connected to the bush (29). The drive ratio between the respective drive inputs (109, 119) and the bush (29) are different from each other such that a larger torque is delivered to the bush (29) from the unlocking drive input (119) in comparison to the torque delivered to the bush (29) from the locking drive input (109) for the same torque input.
F16K 29/00 - Dispositions pour le mouvement des corps de soupapes autre que celui d'ouverture ou de fermeture de la soupape, p.ex. pour le rodage, pour empêcher le gommage
F16K 1/02 - Soupapes ou clapets, c. à d. dispositifs obturateurs dont l'élément de fermeture possède au moins une composante du mouvement d'ouverture ou de fermeture perpendiculaire à la surface d'obturation à tige filetée
F16K 1/04 - Soupapes ou clapets, c. à d. dispositifs obturateurs dont l'élément de fermeture possède au moins une composante du mouvement d'ouverture ou de fermeture perpendiculaire à la surface d'obturation à tige filetée et dont l'élément de fermeture fait corps avec la tige, p.ex. soupapes principales
F16K 31/04 - Moyens de fonctionnement; Dispositifs de retour à la position de repos magnétiques utilisant un moteur
F16K 31/05 - Moyens de fonctionnement; Dispositifs de retour à la position de repos magnétiques utilisant un moteur spécialement conçus pour manœuvrer les soupapes à fonctionnement manuel ou pour la manœuvre conjuguée au moteur et à la main
A heat exchange apparatus (10) comprising an arrangement of relatively small diameter tubes (30) extending substantially longitudinally through a shell (12), the shell (12) having provided an inlet (16) and an outlet (18) for the ingress and egress of a material from which heat is to be transferred, and the tubes (30) being provided with both an inlet and an outlet for a material to which heat is to be transferred, wherein there are at least two such shell and tube arrangements provided and between which the material to be heated is to be transferred, and a transfer line connecting the at least two shell and tube arrangements, characterised in that the transfer line is provided in a form that discourages settling of solids entrained in the material to be heated.
F28D 7/16 - Appareils échangeurs de chaleur comportant des ensembles de canalisations tubulaires fixes pour les deux sources de potentiel calorifique, ces sources étant en contact chacune avec un côté de la paroi d'une canalisation les canalisations étant espacées parallèlement
F28D 7/10 - Appareils échangeurs de chaleur comportant des ensembles de canalisations tubulaires fixes pour les deux sources de potentiel calorifique, ces sources étant en contact chacune avec un côté de la paroi d'une canalisation les canalisations étant disposées l'une dans l'autre, p.ex. concentriquement
F28F 13/08 - Dispositions pour modifier le transfert de chaleur, p.ex. accroissement, diminution en affectant le mode d'écoulement des sources de potentiel calorifique en faisant varier la section transversale des canaux d'écoulement
Abstract A separator apparatus (10) characterised by a fluid inlet (12), a fluid outlet (14), a separated solids outlet (30) and a swirl vane (22), the swirl vane (22) being located down stream of the fluid inlet (12) but upstream of the fluid outlet (14) and separated solids outlet (30), the swirl vane (22) further being arranged so as to impart to the fluid flow passing therethrough a flow such that entrained particles move radially outward due to inertia, the fluid outlet (14) being arranged in-line with the fluid inlet (12) and swirl vane (22) whereas the solids outlet (30) is fed by a radially arranged collector.
B04C 3/06 - Structures des entrées ou sorties de la chambre où se produit le tourbillon
B01D 21/26 - Séparation du sédiment avec emploi de la force centrifuge
B01D 45/16 - Séparation de particules dispersées dans des gaz ou des vapeurs par gravité, inertie ou force centrifuge en utilisant la force centrifuge produite par le mouvement hélicoïdal du courant gazeux
52.
METHOD FOR THE CAUSTICISATION OF BAYER PROCESS SOLUTIONS
A method for the causticisation of a Bayer process solution, the method including the steps of: adding a source of phosphate to the Bayer process solution; adding a causticising agent to the Bayer process solution; and forming a calcium phosphate precipitate, thereby causticising the Bayer process solution.
C01F 7/06 - Préparation des aluminates de métaux alcalins; Oxyde ou hydroxyde d'aluminium obtenus à partir de ceux-ci par traitement de minéraux alumineux ou de matières premières assimilables à des déchets avec de l'hydroxyde alcalin, p.ex. par lixiviation de la bauxite selon le procédé Bayer
53.
METHOD OF CATALYTIC WET OXIDATION OF ORGANIC CONTAMINANTS OF ALKALINE SOLUTIONS
A method for the catalytic wet oxidation of organic contaminants of an alkaline solution, the method including the step of exposing the alkaline solution to an oxidising agent and a catalyst, under conditions suitable for the catalytic wet oxidation of organic contaminants, the method characterised in that the alkaline solution is exposed to the oxidising agent and the catalyst while the ratio of the concentration of free caustic in the alkaline solution (expressed in grams per litre equivalent of sodium carbonate) to the concentration of organic contaminants in the alkaline solution (expressed as grams per litre equivalent of carbon) is at least approximately 4.
C01F 7/04 - Préparation des aluminates de métaux alcalins; Oxyde ou hydroxyde d'aluminium obtenus à partir de ceux-ci
C01F 7/06 - Préparation des aluminates de métaux alcalins; Oxyde ou hydroxyde d'aluminium obtenus à partir de ceux-ci par traitement de minéraux alumineux ou de matières premières assimilables à des déchets avec de l'hydroxyde alcalin, p.ex. par lixiviation de la bauxite selon le procédé Bayer
A liquor analyser apparatus and method intended for use in real-time or near real-time in-field/on-line analysis of Bayer process liquors to determine the total alumina, total caustic, and total alkali concentrations, and if required, the total concentration of impurities, in the liquor is disclosed. The apparatus and method obviates the need for laboratory analysis, aside of any calibration analysis for initial set-up. The apparatus provides concentrations of alumina, total caustic and total alkali by relying on accurate determination of liquor temperature, density, sound velocity, conductivity and maximum conductivity of the liquor under isothermal dilution. The apparatus is formed around a vessels (11), (13), and (15) with sensors to measure these parameters. The vessels (11), (13), and (15) are fluidly connected in series, with vessel (15) draining to a reservoir (17). A pump (19) is provided to recirculate fluid from the reservoir (17) to the vessels (11), (13), (15) in a closed circuit manner. The vessels (11), (13), (15) and reservoir (17) are contained within a water jacket chamber (21) which is maintained at a suitable constant temperature. The apparatus has a sample inlet (23) and a water inlet (25), and a drain (27). An overflow (29) from the reservoir (17) connects to the drain to discharge fluid during dilution analysis of the fluid. Sample flows are controlled by automatic operation of valves MV1, MV2, MV3, and MV4. Water flow control is controlled via solenoid valves SV1, SV2, SV3, and SV4. Operation is automated by a PLC.
G01N 11/00 - Recherche des propriétés d'écoulement des matériaux, p.ex. la viscosité, la plasticité; Analyse des matériaux en déterminant les propriétés d'écoulement
