Provided is a method for recovering valuable materials from lithium ion secondary batteries, said method comprising: a heat treatment step for obtaining a heat-treated material by subjecting a lithium ion secondary battery to a heat treatment; a first classification step for obtaining a coarse-grain product 1 and a fine-grain product, by crushing the heat-treated material and classifying the resulting crushed material using a classification point from 600 µm to 2,400 µm; a pulverization step for pulverizing the fine-grain product to obtain a pulverized material; a second classification step for obtaining a coarse-grain product 2 and a very fine-grain product 1, by classifying the pulverized material using at least one classification point that is smaller than the classification point in the first classification step and is from 75 µm to 1,200 µm; and a magnetic sorting step for sorting, using magnetic force, the very fine-grain product 1 yielded by the second classification step.
C22B 3/22 - Traitement ou purification de solutions, p.ex. de solutions obtenues par lixiviation par des procédés physiques, p.ex. par filtration, par des moyens magnétiques
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
RECYCLED POSITIVE ELECTRODE MATERIAL, METHOD FOR PRODUCING SAME, METHOD FOR USING RECYCLED POSITIVE ELECTRODE MATERIAL, RECYCLED POSITIVE ELECTRODE, AND LITHIUM ION SECONDARY BATTERY
Provided is a recycled positive electrode material comprising: lithium, nickel, cobalt, and manganese; 0.3 mass% to 3 mass% of aluminium; and less than 1 mass% of at least one of copper and iron.
H01M 4/525 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs d'oxydes ou d'hydroxydes inorganiques de nickel, de cobalt ou de fer d'oxydes ou d'hydroxydes mixtes contenant du fer, du cobalt ou du nickel pour insérer ou intercaler des métaux légers, p.ex. LiNiO2, LiCoO2 ou LiCoOxFy
C22B 3/06 - Extraction de composés métalliques par voie humide à partir de minerais ou de concentrés par lixiviation dans des solutions inorganiques acides
C22B 3/22 - Traitement ou purification de solutions, p.ex. de solutions obtenues par lixiviation par des procédés physiques, p.ex. par filtration, par des moyens magnétiques
C22B 3/44 - Traitement ou purification de solutions, p.ex. de solutions obtenues par lixiviation par des procédés chimiques
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
H01M 4/131 - PROCÉDÉS OU MOYENS POUR LA CONVERSION DIRECTE DE L'ÉNERGIE CHIMIQUE EN ÉNERGIE ÉLECTRIQUE, p.ex. BATTERIES Électrodes Électrodes composées d'un ou comprenant un matériau actif Électrodes pour accumulateurs à électrolyte non aqueux, p.ex. pour accumulateurs au lithium; Leurs procédés de fabrication Électrodes à base d'oxydes ou d'hydroxydes mixtes, ou de mélanges d'oxydes ou d'hydroxydes, p.ex. LiCoOx
H01M 4/505 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs d'oxydes ou d'hydroxydes inorganiques de manganèse d'oxydes ou d'hydroxydes mixtes contenant du manganèse pour insérer ou intercaler des métaux légers, p.ex. LiMn2O4 ou LiMn2OxFy
H01M 10/54 - Récupération des parties utiles des accumulateurs usagés
This method for processing a solar cell module comprises: a preparation step of removing a frame member from the solar cell module to obtain a removed frame; a crushing step of crushing the removed frame to obtain a crushed material; and an electrostatic separation step of subjecting the crushed material to electrostatic separation, wherein in the electrostatic separation step, the crushed material is electrically charged, and separation is performed according to density and conductivity.
22 is added to a liquid that is obtained by the neutralized cake solid-liquid separation step; a calcium carbonate solid-liquid separation step in which a liquid that is obtained by the calcium carbonate crystallization step is subjected to solid-liquid separation; and a calcium adsorptive removal step in which calcium is adsorbed and removed by means of a chelating resin after the calcium carbonate solid-liquid separation step.
H01M 10/54 - Récupération des parties utiles des accumulateurs usagés
B09B 3/40 - Destruction de déchets solides ou transformation de déchets solides en quelque chose d'utile ou d'inoffensif impliquant un traitement thermique, p.ex. évaporation
B09B 3/70 - Traitement chimique, p.ex. ajustement du pH ou oxydation
B09B 5/00 - Opérations non couvertes par une seule autre sous-classe ou par un seul autre groupe de la présente sous-classe
C22B 3/22 - Traitement ou purification de solutions, p.ex. de solutions obtenues par lixiviation par des procédés physiques, p.ex. par filtration, par des moyens magnétiques
C22B 3/24 - Traitement ou purification de solutions, p.ex. de solutions obtenues par lixiviation par des procédés physiques, p.ex. par filtration, par des moyens magnétiques par adsorption sur des substances solides, p.ex. par extraction avec des résines solides
C22B 3/44 - Traitement ou purification de solutions, p.ex. de solutions obtenues par lixiviation par des procédés chimiques
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
5.
RECYCLED POSITIVE ELECTRODE MATERIAL PRECURSOR, RECYCLED POSITIVE ELECTRODE MATERIAL, METHOD FOR PRODUCING SAME, AND RECYCLED LITHIUM ION SECONDARY BATTERY
Provided is a recycled positive electrode material precursor that includes a metal element α comprising at least one of nickel, cobalt, and manganese and a metal element β comprising at least one of iron, copper, and aluminum, wherein the content of the metal element β with respect to the recycled positive electrode material precursor is 0.5-20 mass%. The present invention also provides technology relating to the recycled positive electrode material precursor.
H01M 10/54 - Récupération des parties utiles des accumulateurs usagés
H01M 4/505 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs d'oxydes ou d'hydroxydes inorganiques de manganèse d'oxydes ou d'hydroxydes mixtes contenant du manganèse pour insérer ou intercaler des métaux légers, p.ex. LiMn2O4 ou LiMn2OxFy
H01M 4/525 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs d'oxydes ou d'hydroxydes inorganiques de nickel, de cobalt ou de fer d'oxydes ou d'hydroxydes mixtes contenant du fer, du cobalt ou du nickel pour insérer ou intercaler des métaux légers, p.ex. LiNiO2, LiCoO2 ou LiCoOxFy
This sorting method for valuable materials includes: a heat treatment step for performing a heat treatment on a lithium ion secondary battery including valuable materials; a crushing step for crushing the heated treated object obtained in the heat treatment step; and classification steps including a first classification step for classifying the crushed object obtained in the crushing step into an intermediate product and a coarse-grained product at a classification point of 0.6-2.4 mm, and a second classification step for classifying the intermediate product into a medium-grained product and a fine-grained product at a classification point of 40-300 μm.
A method for processing a solar cell module, the method comprising: a preparation step for preparing a solar cell sheet-like structure, which comprises at least a solar cell, a metal pattern that is wired from the solar cell, a resin sealing material that seals the solar cell and the metal pattern, and a resin protection member that is provided on one surface of the sealing material, by removing a glass substrate and a frame member from a solar cell module; a fracturing step for forming fractured matter, which contains powders derived from the respective members, by fracturing the solar cell sheet-like structure; and a separation step for separating the powders according to type, namely into metals and resins, by subjecting the fractured matter to electrostatic separation and air classification.
A method for recovering valuable materials from a lithium ion secondary battery, the method including: a heat treatment step for heat-treating a lithium ion secondary battery containing aluminum, carbon, and copper foil as constituent materials; and a wet sorting step for applying external force, in the presence of a liquid, to the heat-treated material obtained in the heat treatment step, and separating heavy products from light products, including copper.
A method for recovering a valuable substance, the method including a heat treatment step for heat-treating a subject material containing a valuable substance via a flame isolation means that isolates a flame for heat-treating the subject material such that the flame does not come into contact with a subject-material-accommodating means in which the subject material is accommodated, and a valuable substance recovery step for recovering the valuable substance from the heat-treated subject material obtained through the heat treatment step.
Provided is a method for recovering a valuable substance, the method comprising: a heat treatment step for heat-treating an object including a valuable substance by using a continuous furnace, which heat-treats the object, while moving an object accommodating means in which the object is accommodated, and keeping the object accommodating means away from a flame for the heat treatment; and a valuable substance recovering step for recovering a valuable substance from a heat-treated object obtained by the heat treatment step.
A valuable matter recovery method comprising: a heat treatment step for heat-treating an object containing a valuable matter by supporting an object storage means that houses the object by means of a support means capable of supporting said object housing means and by heating a gas present in a region where the support means is located by means of a flame used to heat-treat the object in such a manner as to keep the flame out of contact with the object storage means; and a valuable matter recovery step for recovering the valuable matter from the heat-treated object obtained in the heat treatment step.
B09B 3/40 - Destruction de déchets solides ou transformation de déchets solides en quelque chose d'utile ou d'inoffensif impliquant un traitement thermique, p.ex. évaporation
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
Provided is a treatment method that is for petroleum drilling produced water and that comprises: a step for subjecting petroleum drilling produced water to an aggregation/precipitation treatment, and thereby separating the produced water into clear water and precipitates; and a step for subjecting the clear water to an evaporation/condensation treatment to obtain condensed water that is allowed to be discharged and concentrated water in which oil components and the like are concentrated.
The present invention provides a method for recovering a valuable substance, by said method a valuable substance being recovered from a lithium ion secondary battery. This method for recovering a valuable substance comprises: a heat treatment step wherein a lithium ion secondary battery is subjected to a heat treatment, thereby obtaining a heat-treated material; a crushing/classifying step wherein a crushed material obtained by crushing the heat-treated material is subjected to classification, thereby obtaining a coarse grain product and a fine grain product, each of which contains the valuable substance; a water leaching step wherein the fine grain product is immersed in water, thereby obtaining a water leaching slurry; a wet magnetic separation step wherein the water leaching slurry is subjected to wet magnetic separation, thereby separating the water leaching slurry into a magnetically attracted material and a magnetically non-attracted material slurry; and an acid leaching step wherein an acidic solution is added to the magnetically non-attracted material slurry obtained by the wet magnetic separation and/or a magnetically non-attracted material obtained by subjecting the magnetically non-attracted material slurry to solid-liquid separation, and solid-liquid separation is performed after leaching the magnetically non-attracted material at a pH of less than 4, thereby obtaining an acid leachate and an acid leaching residue.
H01M 10/54 - Récupération des parties utiles des accumulateurs usagés
C22B 3/04 - Extraction de composés métalliques par voie humide à partir de minerais ou de concentrés par lixiviation
C22B 3/06 - Extraction de composés métalliques par voie humide à partir de minerais ou de concentrés par lixiviation dans des solutions inorganiques acides
C22B 3/22 - Traitement ou purification de solutions, p.ex. de solutions obtenues par lixiviation par des procédés physiques, p.ex. par filtration, par des moyens magnétiques
C22B 3/24 - Traitement ou purification de solutions, p.ex. de solutions obtenues par lixiviation par des procédés physiques, p.ex. par filtration, par des moyens magnétiques par adsorption sur des substances solides, p.ex. par extraction avec des résines solides
C22B 3/44 - Traitement ou purification de solutions, p.ex. de solutions obtenues par lixiviation par des procédés chimiques
14.
METHOD FOR RECOVERING LITHIUM AND METHOD FOR PROCESSING LITHIUM ION SECONDARY BATTERY
The present invention provides a method for recovering lithium, and the like, said method for recovering lithium enabling recovery of lithium from a lithium ion secondary battery. This method for recovering lithium comprises: a heat treatment step for obtaining a heat-treated material by subjecting a lithium ion secondary battery, wherein a voltage of 80% or more relative to the rated voltage remains, to a heat treatment; a crushing step for obtaining a crushed material by crushing the heat-treated material; and a lithium recovery step for recovering lithium from the crushed material.
H01M 10/54 - Récupération des parties utiles des accumulateurs usagés
C22B 3/04 - Extraction de composés métalliques par voie humide à partir de minerais ou de concentrés par lixiviation
C22B 3/22 - Traitement ou purification de solutions, p.ex. de solutions obtenues par lixiviation par des procédés physiques, p.ex. par filtration, par des moyens magnétiques
C22B 3/44 - Traitement ou purification de solutions, p.ex. de solutions obtenues par lixiviation par des procédés chimiques
The present invention provides a method for concentrating a valuable metal contained in a lithium ion secondary battery, wherein a lithium ion secondary battery or a positive electrode material of the lithium ion secondary battery containing at least one of cobalt and nickel is treated so as to concentrate a valuable metal comprising at least one of cobalt and nickel. This method for concentrating a valuable metal contained in a lithium ion secondary battery comprises a heat treatment step wherein the lithium ion secondary battery or a positive electrode material thereof is subjected to a heat treatment, thereby forming a grain aggregate that contains at least one of cobalt and nickel, which are valuable metals.
B09B 3/00 - Destruction de déchets solides ou transformation de déchets solides en quelque chose d'utile ou d'inoffensif
B09B 5/00 - Opérations non couvertes par une seule autre sous-classe ou par un seul autre groupe de la présente sous-classe
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
C22B 23/02 - Obtention du nickel ou du cobalt par voie sèche
H01M 4/587 - Matériau carboné, p.ex. composés au graphite d'intercalation ou CFx pour insérer ou intercaler des métaux légers
H01M 10/54 - Récupération des parties utiles des accumulateurs usagés
H01M 50/20 - Montures; Boîtiers secondaires ou cadres; Bâtis, modules ou blocs; Dispositifs de suspension; Amortisseurs; Dispositifs de transport ou de manutention; Supports
Provided is a separation method for valuable resources, the method comprising: a heat treatment step for heat-treating an object containing valuable resources to melt aluminum and separate a molten material; a crushing step for crushing a heat-treated material left after separating the molten material to obtain a crushed material; a magnetic separation step, performed on the crushed material, for separating the valuable resources by magnetic force; and a wind separation step, performed on the valuable resources, for separating one valuable resource from another valuable resource by wind force.
B07B 7/01 - Séparation sélective des matériaux solides portés par des courants de gaz, ou dispersés dans ceux-ci utilisant la pesanteur
B07B 9/00 - Combinaisons d'appareils à cribler ou tamiser ou à séparer des solides par utilisation de courants de gaz; Disposition générale des installations, p.ex. schéma opératoire
B07B 15/00 - Combinaisons d'appareils à séparer les solides par voie sèche, applicables aux matériaux en vrac, p.ex. aux objets manipulés en vrac
B09B 3/00 - Destruction de déchets solides ou transformation de déchets solides en quelque chose d'utile ou d'inoffensif
B09B 5/00 - Opérations non couvertes par une seule autre sous-classe ou par un seul autre groupe de la présente sous-classe
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
A metal recovery method comprising a crushing step of crushing a solar battery module or a solar battery sheet-like structure to form a crushed material and a selection step of selecting the crushed material, wherein the method being characterized in that the solar battery sheet-like structure is a product produced by removing a glass substrate and a frame member from a solar battery module and provided with at least a solar battery cell, a metal pattern that is wired from the solar battery cell, and a sealing material that can seal the solar battery cell and the metal pattern.
Provided is a method for separating lithium, with which lithium is separated from a lithium solution containing 200 mg/L or more of lithium and 20 mg/L or more of fluorine. The method includes: a first removal step for adding a first component, which solidifies fluorine contained in the lithium solution, to the lithium solution, removing the solidified fluorine and obtaining a fluorine-depleted liquid; and a second removal step for adding a second component, which solidifies the first component remaining in the fluorine-depleted liquid, to the fluorine-depleted liquid, removing the solidified first component and obtaining a first component-depleted liquid.
H01M 10/54 - Récupération des parties utiles des accumulateurs usagés
C22B 3/04 - Extraction de composés métalliques par voie humide à partir de minerais ou de concentrés par lixiviation
C22B 3/06 - Extraction de composés métalliques par voie humide à partir de minerais ou de concentrés par lixiviation dans des solutions inorganiques acides
C22B 3/22 - Traitement ou purification de solutions, p.ex. de solutions obtenues par lixiviation par des procédés physiques, p.ex. par filtration, par des moyens magnétiques
C22B 3/44 - Traitement ou purification de solutions, p.ex. de solutions obtenues par lixiviation par des procédés chimiques
This method for treating an object to be treated is characterized by having: a methane fermentation step for decomposing organic matter in the object to be treated by means of a methane fermentation method to obtain methane fermentation treatment water; a step for oxidizing ammonia in the methane fermentation treatment water through the action of aerobes to make a nitric acid, and obtaining nitrified water by decomposing organic matter; and an evaporative concentration step for obtaining concentrated water and condensed water by evaporating and concentrating the nitrified water.
[Problem] To provide a method for regenerating used cerium oxide-based abrasive particles in which treatment can be performed using a small amount of chemicals without the use of fluorides, the method for regenerating used cerium oxide-based abrasive particles being such that degradation over time of the abrasive performance of the regenerated cerium oxide-based abrasive is reduced. [Solution] This method comprises: dispersing used cerium oxide-based abrasive particles in water to obtain a slurry; making alkaline the slurry containing the used cerium oxide-based abrasive particles; removing a coagulant or another chemical used to recover the abrasive; making the abrasive particles into a slurry again; rendering the pH thereof acidic, whereby the abrasive particles and glass microparticles generated by polishing are separated; and heat-treating the recovered abrasive particles, whereby the used cerium oxide-based abrasive particles are regenerated.
B24B 57/02 - Dispositifs pour l'alimentation, l'application, le triage ou la récupération de produits de meulage, polissage ou rodage pour l'alimentation en produits de meulage, polissage ou rodage à l'état fluide, vaporisés, pulvérisés ou liquéfiés
The purpose of the present invention is to provide a recycling method which achieves a high removal efficiency for a silicon component and an aluminum component and thus makes it possible to recover simply a polishing agent having polishing performance equivalent to that of a fresh polishing agent from a spent cerium oxide-based glass-polishing agent. A recycling method for recovering a polishing agent from a spent cerium oxide-based glass-polishing agent, including adjusting the pH of a spent cerium oxide-based glass-polishing agent slurry to 0.5 to 3.0.
Provided is a method that easily recycles an abrasive agent having an abrasive performance equivalent to a pre-use new abrasive agent, and that has a high rate of elimination of silicon components and aluminum components from a used cerium oxide glass abrasive agent containing a flocculating agent. The method for recycling the abrasive agent from a used cerium oxide glass abrasive agent containing a flocculating agent includes a step for adjusting the pH of a slurry of the used cerium oxide glass abrasive agent containing a flocculating agent into the range of 10.0-14.0, and then adjusting the pH of the slurry into the range of 1.0-3.0.
B24B 57/02 - Dispositifs pour l'alimentation, l'application, le triage ou la récupération de produits de meulage, polissage ou rodage pour l'alimentation en produits de meulage, polissage ou rodage à l'état fluide, vaporisés, pulvérisés ou liquéfiés
B24B 37/00 - Machines ou dispositifs de rodage; Accessoires
Provided is a method for recovering valuable materials from lithium ion secondary cells, including: a heat treatment step for heating, to a temperature of 250ºC to 550ºC, lithium ion secondary cells having a positive electrode containing aluminum as the positive electrode current collector, and a negative electrode containing copper as the negative electrode current collector, to obtain a heated material; a sorting step for sorting the positive electrodes and the negative electrodes in the heated material; a crushing step for respectively crushing the positive electrodes and the negative electrodes sorted in the sorting step, to respectively obtain a crushed positive electrode material and a crushed negative electrode material; a first sieve sorting step for sieving out the crushed positive electrode material and recovering the aluminum; and a second sieve sorting step for sieving out the crushed negative electrode material and recovering the copper.
Provided is a method for recovering valuable metal from a liquid containing a valuable metal by, in an electrolysis tank that has a positive electrode and a cylindrical negative electrode and that holds the liquid containing the valuable metal, performing electrolytic recovery while rotating the cylindrical negative electrode, precipitating the valuable metal at the cylindrical negative electrode.
A method for recovering valuable material from a positive electrode in a lithium-ion secondary battery, that includes a processing step in which the positive electrode for the lithium-ion secondary battery including aluminum as a collector and including the valuable material is processed using a sodium hydroxide aqueous solution having a sodium hydroxide concentration of 2-40 mass%.
A method for recovering valuable material from a positive electrode in a lithium-ion secondary battery that includes a collector comprising aluminum and includes valuable material comprising at least either cobalt or nickel, said method including: a heating step in which the positive electrode in the lithium-ion secondary battery is heated to 500-600°C, preferably 590-610°C; and a sieve screening step in which the positive electrode after the heating step is sieve-screened using a sieve having mesh openings of no more than 2.0 mm, and recovered material containing the valuable material and having a collector content of no more than 2 mass% is obtained.
Provided is a lithium carbonate production method in which a solution that contains lithium ions and carbonate ions is electrified to precipitate lithium carbonate.
Provided is an iron powder which has an organic halogen compound processing performance equivalent to or higher than that of conventional organic halogen compound processing materials, without containing a substance such as copper that places burden on the environment. Also provided is a method for producing an iron powder for processing organic halogen compounds, which is characterized by comprising: a step wherein an iron powder is immersed in one or more solvents selected from among water and organic solvents that have lower vapor pressure than water and contain oxygen; a step wherein the iron powder immersed in the solvents is subjected to solid-liquid separation, thereby obtaining iron powder dampened with the solvents; and a step wherein the iron powder dampened with the solvents is dried, while being maintained at a temperature less than 40˚C.
B22F 1/00 - Poudres métalliques; Traitement des poudres métalliques, p.ex. en vue de faciliter leur mise en œuvre ou d'améliorer leurs propriétés
A62D 3/34 - Déshalogénation au moyen de réactifs susceptibles d'effectuer la dégradation
A62D 3/37 - Procédés pour rendre les substances chimiques nuisibles inoffensives ou moins nuisibles en effectuant un changement chimique dans les substances par réaction avec des agents chimiques par réduction, p.ex. hydrogénation
B09C 1/02 - Extraction au moyen de liquides, p.ex. lavage, lixiviation
B09C 1/08 - Régénération de sols pollués par des procédés chimiques
C02F 1/70 - Traitement de l'eau, des eaux résiduaires ou des eaux d'égout par réduction
A method for recovering a valuable material from a lithium-ion secondary battery, including: a roasting step for roasting a lithium-ion secondary battery including a valuable material in a metallic battery case, and obtaining a roasted material; a separating step for stirring the roasted material with a liquid and separating, from within the metallic battery case, a content containing the valuable material; and a sorting step for sorting the metallic battery case from the content that has been separated in the separating step, and obtaining a recovered material containing the valuable material.
The disclosed method for recovering a cerium oxide polishing agent involves at least a crushing step of mixing caked polishing-agent waste containing a cerium oxide polishing agent and polished glass debris with an acid aqueous solution or an alkali aqueous solution, and crushing the caked polishing-agent waste with a crushing machine.
B24B 57/02 - Dispositifs pour l'alimentation, l'application, le triage ou la récupération de produits de meulage, polissage ou rodage pour l'alimentation en produits de meulage, polissage ou rodage à l'état fluide, vaporisés, pulvérisés ou liquéfiés
H01L 21/304 - Traitement mécanique, p.ex. meulage, polissage, coupe
31.
ORGANIC HALOGEN COMPOUND DECOMPOSITION AGENT CONTAINING IRON PARTICLES, AND PROCESS FOR PRODUCTION THEREOF
Provided are: a decomposition agent which needs not to contain copper, is composed of iron particles, and is capable of decomposing an organic halogen compound satisfactorily; and a process for producing the decomposition agent. The decomposition agent for an organic halogen compound comprises iron particles composed of iron and iron oxide, wherein the outermost surface layer of each of the iron particles has a metal iron content of 15 mass% or more when two rounds of ion beam etching are carried out under the following etching conditions: the degree of vacuum in a chamber: 2.0×10-2 Pa; the accelerating voltage of an ion gun: 10 kV; the emission current: 10 mA; and the etching time: 14 seconds.
The disclosed method sorts contaminated soil into gravel, coarse soil and fine soil without using water, and separates contaminants from the coarse soil easily and inexpensively. The soil cleaning method is characterized in that after a pre-treatment process of mixing dehydrating agent with the soil to reduce the water content to 10 mass% or less, the soil with water content reduced to 10 mass% or less in said pre-treatment process is fed into a dry magnetic separator and a magnetic separation process of separating and removing contaminants in the coarse soil as magnetic material is performed. Sorting the soil in a dry state into magnetic material and nonmagnetic material and recovering the magnetic material that is highly contaminated facilitates separation of fine soil from the contaminated soil and enables easy reduction of the contaminant content in the coarse soil.
Disclosed is an agent for decomposing an organic halogen-containing compound, which comprises an iron powder being composed of flat iron particles having a planar ratio of 2 or more. Further, disclosed is an agent for decomposing an organic halogen-containing compound which comprises a copper salt-containing iron powder being composed of iron particles having a copper salt adhered thereto wherein flat iron particles having a planar ratio of 2 or more have copper particles being finer than the iron particles adhered to the surface thereof.
A process for the production of an organohalogen compound decomposing agent by subjecting preliminarily produced iron powder to such plastic deformation as to give iron powder having flaky particle shape; and a process for the production of an organohalogen compound decomposing agent by mechanically mixing iron powder with a copper salt powder in a ball mill to form iron powder containing the salt through union of both powder particles, characterized in that the iron powder is subjected to such plastic deformation as to give iron powder having flaky particle shape.
brevets
