Abstract

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.

IPC Classes  ?

• C01F 7/306 - Thermal decomposition of hydrated chlorides, e.g. of aluminium trichloride hexahydrate
• B01D 9/00 - Crystallisation
• C01F 7/62 - Purification

Abstract

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.

IPC Classes  ?

• C01F 7/306 - Thermal decomposition of hydrated chlorides, e.g. of aluminium trichloride hexahydrate
• C01F 7/56 - Chlorides

Abstract

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.

IPC Classes  ?

• C05C 1/02 - Granulation; Pelletisation; Stabilisation; Colouring
• C05G 3/00 - Mixtures of one or more fertilisers with additives not having a specifically fertilising activity

Abstract

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.

IPC Classes  ?

• F16L 11/04 - Hoses, i.e. flexible pipes made of rubber or flexible plastics
• G01N 1/20 - Devices for withdrawing samples in the liquid or fluent state for flowing or falling materials

Abstract

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.

IPC Classes  ?

• C01F 7/00 - Compounds of aluminium
• C01F 7/06 - Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom by treating aluminous minerals or waste-like raw materials with alkali hydroxide, e.g. leaching of bauxite according to the Bayer process
• C01F 7/04 - Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
• C01F 7/14 - Aluminium oxide or hydroxide from alkali metal aluminates
• C01F 7/47 - Purification of aluminium oxide, aluminium hydroxide or aluminates of aluminates, e.g. removal of compounds of Si, Fe, Ga or of organic compounds from Bayer process liquors

Abstract

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.

IPC Classes  ?

• B01D 1/22 - Evaporating by bringing a thin layer of the liquid into contact with a heated surface
• B01D 19/00 - Degasification of liquids
• B01D 1/06 - Evaporators with vertical tubes
• B01D 5/00 - Condensation of vapours; Recovering volatile solvents by condensation
• B01D 1/28 - Evaporating with vapour compression
• B01D 1/30 - Accessories for evaporators
• B01D 3/38 - Steam distillation