A method for recovering lithium from waste lithium-ion batteries, the method including: a dissolution step of dissolving active material powder obtained by pre-processing waste lithium-ion batteries in a mineral acid; a neutralization step of adding at least one selected from the group consisting of sodium hydroxide and potassium hydroxide to a solution obtained in the dissolution step; a solvent extraction step of separating at least one metal excluding lithium from a solution obtained in the neutralization step by organic solvent extraction to obtain an alkali mixed salt aqueous solution; a separation step of separating each of a lithium salt and a salt of at least one selected from the group consisting of sodium and potassium from the alkali mixed salt aqueous solution; and a lithium recovery step of recovering lithium from a first lithium salt aqueous solution obtained in the separation step.
A method for recovering lithium from waste lithium ion batteries includes: dissolving active material powder obtained by pre-processing the waste lithium ion batteries in a mineral acid to obtain a solution; neutralizing the solution with lithium hydroxide; re-adding lithium hydroxide to the acid solution to which lithium hydroxide has been added and filtering precipitates to obtain a first lithium salt aqueous solution as a filtrate; and subjecting the first lithium salt aqueous solution to membrane electrolysis using an ion exchange membrane to obtain a lithium hydroxide aqueous solution, an acid, and a second lithium salt aqueous solution that is more dilute than the first lithium salt aqueous solution, and the lithium hydroxide aqueous solution obtained is reused in the neutralization step and/or the lithium hydroxide re-addition step, and the acid obtained is reused as the mineral acid used in the dissolution step.
H01M 10/54 - Récupération des parties utiles des accumulateurs usagés
B09B 3/80 - Destruction de déchets solides ou transformation de déchets solides en quelque chose d'utile ou d'inoffensif impliquant une étape d'extraction
To provide a method for recovering valuable metals by a wet process from waste lithium-ion batteries, in which the amount of reducing agent added is very small or, preferably, the addition of a reducing agent is not required. A method for recovering valuable metals according to the present invention includes a dissolution step in which active material powder containing at least one selected from the group consisting of manganese, cobalt, and nickel obtained by pre-treating waste lithium-ion batteries and copper are introduced into a mineral acid to obtain an acid dissolution solution. At least one selected from the group consisting of the manganese leaching rate, the cobalt leaching rate, and the nickel leaching rate in the acid dissolution solution after the dissolution step is 90% or more.
C22B 3/20 - Traitement ou purification de solutions, p. ex. de solutions obtenues par lixiviation
C22B 3/26 - Traitement ou purification de solutions, p. ex. de solutions obtenues par lixiviation par extraction liquide-liquide utilisant des composés organiques
C22B 3/44 - Traitement ou purification de solutions, p. ex. de solutions obtenues par lixiviation par des procédés chimiques
C25B 1/46 - Production simultanée d'hydroxydes des métaux alcalins et de chlore, de ses oxyacides ou de ses sels, p. ex. électrolyse chlore-alcali dans des cellules à diaphragmes
C25B 9/00 - Cellules ou assemblages de cellulesÉléments de structure des cellulesAssemblages d'éléments de structure, p. ex. assemblages d'électrode-diaphragmeCaractéristiques des cellules relatives aux procédés
H01M 10/54 - Récupération des parties utiles des accumulateurs usagés
C22B 3/26 - Traitement ou purification de solutions, p. ex. de solutions obtenues par lixiviation par extraction liquide-liquide utilisant des composés organiques
C22B 3/06 - Extraction de composés métalliques par voie humide à partir de minerais ou de concentrés par lixiviation dans des solutions inorganiques acides
C25B 1/34 - Production simultanée d'hydroxydes des métaux alcalins et de chlore, de ses oxyacides ou de ses sels, p. ex. électrolyse chlore-alcali
C25B 9/00 - Cellules ou assemblages de cellulesÉléments de structure des cellulesAssemblages d'éléments de structure, p. ex. assemblages d'électrode-diaphragmeCaractéristiques des cellules relatives aux procédés
H01M 10/54 - Récupération des parties utiles des accumulateurs usagés
5.
METHOD FOR RECOVERING LITHIUM FROM LITHIUM-SALT-CONTAINING AQUEOUS SOLUTION
Provided is a method for recovering lithium from lithium-salt-containing aqueous solution by using small-scale equipment in a short time. The method for recovering lithium from lithium-salt-containing aqueous solution includes an aluminum hydroxide producing step of producing aluminum hydroxide in the aqueous liquid containing a lithium salt. In one embodiment of this lithium recovery method, aluminum phosphate is removed from a first slurry containing a mixture of lithium phosphate obtained from a first aqueous lithium salt solution and aluminum hydroxide to provide a second aqueous lithium salt solution, a second slurry obtained by adding an aluminum salt to the second aqueous lithium salt solution is adjusted to a specific condition, and a precipitate of aluminum phosphate is filtered off and removed from the second aqueous lithium salt solution to provide a high-purity aqueous lithium salt solution.
Provided is a method with which it is possible to produce a high-purity lithium hydroxide or lithium salt with a high yield in a short time from an aqueous lithium salt solution that has a low lithium concentration. This method for recovering lithium from a low concentration aqueous lithium salt solution comprises: a lithium extraction step for having lithium in the low concentration aqueous lithium salt solution adsorbed onto a lithium adsorbent, and eluting lithium in the lithium adsorbent that has adsorbed lithium by means of a mineral acid, so as to obtain a first aqueous lithium salt solution from the low concentration aqueous lithium salt solution; a purification step for purifying the first aqueous lithium salt solution so as to obtain a third aqueous lithium salt solution; an evaporative concentration step for evaporating and concentrating the third aqueous lithium salt solution so as to obtain a fourth aqueous lithium salt solution; and a membrane electrolysis step for subjecting the fourth aqueous lithium salt solution to membrane electrolysis so as to obtain an aqueous lithium hydroxide solution, a mineral acid, and a fifth aqueous lithium salt solution that is more dilute than the fourth aqueous lithium salt solution.
C22B 3/20 - Traitement ou purification de solutions, p. ex. de solutions obtenues par lixiviation
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
Provided is a method for treating brackish water after lithium membrane electrolysis to prevent quality deterioration of lithium hydroxide and degradation of equipment. This method for treating brackish water after lithium membrane electrolysis comprises: a first membrane electrolysis step for performing membrane electrolysis on a first lithium chloride solution to obtain a lithium hydroxide solution, hydrochloric acid, and a second lithium chloride solution that is more dilute than the first lithium chloride solution; and a second membrane electrolysis step for performing membrane electrolysis on the lithium chloride solution containing a chlorate generated in the first membrane electrolysis step.
C25B 9/00 - Cellules ou assemblages de cellulesÉléments de structure des cellulesAssemblages d'éléments de structure, p. ex. assemblages d'électrode-diaphragmeCaractéristiques des cellules relatives aux procédés
C25B 15/08 - Alimentation ou vidange des réactifs ou des électrolytesRégénération des électrolytes
H01M 10/54 - Récupération des parties utiles des accumulateurs usagés
8.
METHOD FOR OBTAINING HIGHLY-PURE LITHIUM SALT FROM LOW-GRADE LITHIUM CARBONATE
Provided is a method for obtaining a highly-pure lithium salt from low-grade lithium carbonate without consuming great amount of energy and without generating a large quantity of waste products. This method for obtaining a highly-pure lithium salt from low-grade lithium carbonate comprises: an acid dissolution step for dissolving the low-grade lithium carbonate in a mineral acid; an impurity removal step for removing impurities from a crude lithium salt solution obtained in the acid dissolution step; and a membrane electrolysis step for performing membrane electrolysis on a first lithium salt solution obtained in the impurity removal step to produce a second lithium salt solution and a highly-pure lithium hydroxide solution. A mineral acid generated in the membrane electrolysis step is used in the acid dissolution step. The lithium salt concentration of the second lithium salt solution is lower than the lithium salt concentration of the first lithium salt solution.
Provided is a method for recovering lithium from an aqueous lithium salt solution, the method including a membrane electrolysis step having high efficiency. With this method, lithium hydroxide is less likely to be generated in and on an electrolytic membrane. This membrane electrolysis method for an aqueous lithium salt solution includes: a negative electrode chamber charging step for charging at least one selected from the group consisting of a first aqueous lithium hydroxide solution having a lithium hydroxide concentration of 10% by mass or less and water into a negative electrode chamber of a membrane electrolysis apparatus; and a membrane electrolysis step for performing membrane electrolysis until the lithium hydroxide concentration in the negative electrode chamber reaches a predetermined concentration. The negative electrode chamber charging step and the membrane electrolysis step are preferably repeated sequentially.
C25B 1/46 - Production simultanée d'hydroxydes des métaux alcalins et de chlore, de ses oxyacides ou de ses sels, p. ex. électrolyse chlore-alcali dans des cellules à diaphragmes
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 3/20 - Traitement ou purification de solutions, p. ex. de solutions obtenues par lixiviation
The method for dissolving battery powder in hydrochloric acid according to the present invention includes: stirring battery powder containing valuable metals obtained from waste lithium batteries in hydrochloric acid with a concentration of 50 to 150 g/L at a mass ratio of 250 to 1000% relative to hydrogen chloride in the hydrochloric acid to provide a hydrochloric acid suspension of the battery powder; and adding a predetermined amount of hydrochloric acid to the hydrochloric acid suspension to set the concentration of hydrochloric acid in the hydrochloric acid suspension to 150 to 350 g/L, and then adjusting and stirring the hydrochloric acid suspension such that the proportion of battery powder in the hydrochloric acid suspension to a mass ratio of 50 to 200% relative to hydrogen chloride in the hydrochloric acid suspension to provide a hydrochloric acid solution of the battery powder.
C25B 1/46 - Production simultanée d'hydroxydes des métaux alcalins et de chlore, de ses oxyacides ou de ses sels, p. ex. électrolyse chlore-alcali dans des cellules à diaphragmes
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 3/20 - Traitement ou purification de solutions, p. ex. de solutions obtenues par lixiviation
Provided is a method for treating waste lithium-ion batteries, the method capable of providing battery powder without treatment of fluorine generated by thermal decomposition. In the present invention, a waste lithium-ion battery is heat-treated in a range of temperatures equal to or more than a temperature at which an electrolytic solution is evaporated to dryness and less than a temperature at which fluororesin is thermally decomposed.
The problem to be solved by the present invention is to provide a method for extracting aluminum without causing precipitation of aluminum from an acid dissolution solution. A method for extracting aluminum according to the present invention includes an aluminum extraction step for mixing an acid dissolution solution containing aluminum with an organic solvent containing mono-2-ethylhexyl 2-ethylhexylphosphonate and extracting the aluminum from the acid dissolution solution under conditions in which the equilibrium pH is less than 1.8. When this acid dissolution solution also contains fluorine, the method for extracting aluminum of the present invention includes a step for adjusting the aluminum concentration of this raffinate to a desired range, co-precipitating the fluorine by adjusting the equilibrium pH to 2-7 to generate aluminum hydroxide, and separating and removing the fluorine by solid-liquid separation.
C22B 3/38 - Traitement ou purification de solutions, p. ex. de solutions obtenues par lixiviation par extraction liquide-liquide utilisant des composés organiques contenant du phosphore
B09B 3/80 - Destruction de déchets solides ou transformation de déchets solides en quelque chose d'utile ou d'inoffensif impliquant une étape d'extraction
B09B 5/00 - Opérations non couvertes par une seule autre sous-classe ou par un seul autre groupe de la présente sous-classe
C22B 3/06 - Extraction de composés métalliques par voie humide à partir de minerais ou de concentrés par lixiviation dans des solutions inorganiques acides
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
The present invention addresses the problem of providing a method which is for recovering lithium from waste lithium ion batteries, and which enables recovering of lithium at a high recovery rate. This method for recovering lithium from waste lithium ion batteries comprises: a dissolution step for dissolving, by means of a mineral acid, active material powder which is obtained by pretreating the waste lithium ion batteries; a neutralization step for adding, to a solution obtained in the dissolution step, at least one selected from the group consisting of sodium hydroxide and potassium hydroxide; a solvent extraction step for separating, from the solution obtained in the neutralization step, at least one kind of a metal other than lithium through organic solvent extraction, to thereby obtain an alkaline mixed salt aqueous solution; a separation step for separating, from the alkaline mixed salt aqueous solution, a lithium salt, and a salt of at least one selected from the group consisting of sodium and potassium; and a lithium recovery step for recovering lithium from a first lithium salt aqueous solution obtained in the separation step.
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 3/20 - Traitement ou purification de solutions, p. ex. de solutions obtenues 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 3/26 - Traitement ou purification de solutions, p. ex. de solutions obtenues par lixiviation par extraction liquide-liquide utilisant des composés organiques
C22B 3/38 - Traitement ou purification de solutions, p. ex. de solutions obtenues par lixiviation par extraction liquide-liquide utilisant des composés organiques contenant du phosphore
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
C25B 1/46 - Production simultanée d'hydroxydes des métaux alcalins et de chlore, de ses oxyacides ou de ses sels, p. ex. électrolyse chlore-alcali dans des cellules à diaphragmes
H01M 10/54 - Récupération des parties utiles des accumulateurs usagés
15.
METHOD FOR RECOVERING LITHIUM FROM WASTE LITHIUM ION BATTERIES
The present invention provides a method for recovering a valuable metal from waste lithium ion batteries, the method being capable of recovering lithium at a high recovery rate, and enabling recycling of resources. A method for recovering lithium from waste lithium ion batteries according to the present invention comprises: a dissolution step in which an active material powder that is obtained by subjecting the waste lithium ion batteries to a pretreatment is dissolved into a mineral acid so as to obtain a solution; a neutralization step in which the solution is neutralized with lithium hydroxide; a lithium hydroxide re-addition step in which lithium hydroxide is added again to the acid solution, to which lithium hydroxide has been added, and precipitates are filtered so as to obtain a first aqueous lithium salt solution as a filtrate; and a membrane electrolysis step in which the first aqueous lithium salt solution is subjected to membrane electrolysis using an ion exchange membrane so as to obtain an aqueous lithium hydroxide solution, an acid and a second aqueous lithium salt solution that is more dilute than the first aqueous lithium salt solution. The aqueous lithium hydroxide solution obtained in the membrane electrolysis step is reused in at least one step that is selected from the group consisting of the neutralization step and the lithium hydroxide re-addition step; and the acid obtained in the membrane electrolysis step is reused as the mineral acid that is used in the dissolution step.
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 3/26 - Traitement ou purification de solutions, p. ex. de solutions obtenues par lixiviation par extraction liquide-liquide utilisant des composés organiques
C22B 3/38 - Traitement ou purification de solutions, p. ex. de solutions obtenues par lixiviation par extraction liquide-liquide utilisant des composés organiques contenant du phosphore
C22B 3/44 - Traitement ou purification de solutions, p. ex. de solutions obtenues par lixiviation par des procédés chimiques
C25B 1/46 - Production simultanée d'hydroxydes des métaux alcalins et de chlore, de ses oxyacides ou de ses sels, p. ex. électrolyse chlore-alcali dans des cellules à diaphragmes
H01M 10/54 - Récupération des parties utiles des accumulateurs usagés
16.
METHOD FOR RECOVERING LITHIUM FROM LITHIUM-SALT-CONTAINING AQUEOUS SOLUTION
Provided is a method for recovering lithium from an aqueous solution in which a lithium salt is dissolved, the lithium being recovered in a short time using small equipment. The method for recovering lithium from a lithium-salt-containing aqueous solution includes an aluminum hydroxide generation step for generating aluminum hydroxide in the lithium-salt-containing aqueous solution. In one embodiment of this lithium recovery method, it is preferable that the lithium is recovered while aluminum phosphate is reused. Furthermore, in another embodiment of this lithium recovery method, it is preferable that: aluminum phosphate is removed from a first slurry that contains a mixture of lithium phosphate and aluminum hydroxide and is obtained from a first lithium salt aqueous solution to obtain a second lithium salt aqueous solution; a second slurry obtained by adding an aluminum salt to the second lithium salt aqueous solution is adjusted to specific conditions; and a precipitate of aluminum phosphate is filtered out from the second lithium salt aqueous solution, and a high-purity lithium salt aqueous solution is obtained.
C01F 7/148 - Séparation de l'hydroxyde obtenu, p. ex. par filtration ou déshydratation
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
Provided is a method for producing a high-purity aqueous lithium salt solution, the method allowing filtering aluminum phosphate in a short time. The method for producing a high-purity aqueous lithium salt solution includes: a step of adjusting the pH of a slurry containing a mixture of lithium phosphate and aluminum hydroxide obtained from a first aqueous lithium salt solution being a raw material to a range of 2 to 3 to obtain a precipitate of aluminum phosphate; a step of filtering off and removing the precipitate of aluminum phosphate to obtain a second aqueous lithium salt solution; and a step of purifying the second aqueous lithium salt solution to obtain a high-purity aqueous lithium salt solution.
Provided is a phosphorous recovery method which can reduce the load on the environment. This phosphorous recovery method includes: a slurrying step for obtaining a slurry containing a mixture of lithium phosphate and aluminum hydroxide by adding a phosphate and aluminum salt to a lithium salt aqueous solution, which is a raw material containing lithium salt in a range of 0.1-70 g/L as lithium; and a phosphorous recovery step for adjusting the pH of a filtrate obtained by filtering out the aluminum phosphate and the aluminum hydroxide from the slurry to 5-8, and recovering, as phosphorous, a sludge containing the aluminum phosphate obtained by solid-liquid separation.
Provided is a method by which high-purity valuable metals can be recovered from a waste lithium-ion battery. A method for recovering a valuable metal from a waste lithium-ion battery comprises: a dissolution step for dissolving an active material powder, obtained by pre-treating the waste lithium-ion battery, in first mineral acid to obtain an acid dissolution solution; and a solvent extraction step for separating manganese, cobalt, and nickel, among metals contained in the active material powder, from the acid dissolution solution through solvent extraction to obtain a first lithium salt aqueous solution as a residual liquid of the solvent extraction.
C22B 3/26 - Traitement ou purification de solutions, p. ex. de solutions obtenues par lixiviation par extraction liquide-liquide utilisant des composés organiques
C22B 3/38 - Traitement ou purification de solutions, p. ex. de solutions obtenues par lixiviation par extraction liquide-liquide utilisant des composés organiques contenant du phosphore
The present invention provides a method for leaching lithium, the method enabling the achievement of a lithium compound that has a purity sufficient for use in batteries by leaching lithium from lithium titanium oxide that is contained, as a negative electrode active material or the like, in waste lithium ion batteries. A method for leaching lithium according to the present invention leaches lithium from a powder that contains lithium titanium oxide that is obtained from waste lithium ion batteries, and is characterized in that the powder is immersed in a mineral acid that is at a specific concentration and is heated to a temperature of not less than 80°C but less than 95°C.
Provided is a method for dissolving battery powder in hydrochloric acid, whereby a large amount of battery powder can be dissolved in hydrochloric acid after a single treatment and excellent workability is achieved. In this method for dissolving battery powder in hydrochloric acid, valuable metal-containing battery powder obtained from waste lithium batteries is stirred in hydrochloric acid having a concentration of 50-150 g/L at a mass ratio of 250-1000% relative to hydrogen chloride in the hydrochloric acid to obtain a hydrochloric acid suspension of the battery powder, a predetermined amount of hydrochloric acid is then added to the hydrochloric acid suspension to adjust the concentration of hydrochloric acid in the hydrochloric acid suspension to 150-350 g/L, and the resulting mixture is stirred and adjusted so that the proportion of the battery powder in the hydrochloric acid suspension is 50-200% by mass relative to hydrogen chloride in the hydrochloric acid suspension to obtain a hydrochloric acid solution of the battery powder.
Provided is a method for recovering lithium from waste lithium-ion batteries, that facilitates lithium recovery at a high recovery rate and facilitates recycling of resources. In this method for recovering lithium from waste lithium-ion batteries: active material powder obtained by preprocessing waste lithium-ion batteries is dissolved in a mineral acid; alkali metal hydroxide is added to the obtained acid solution; then at least one type of metal excluding lithium, out of the metals included in the active material powder, is separated by solvent extraction; and a first aqueous solution of an alkali metal salt is obtained. The first aqueous solution of an alkali metal salt is electrolyzed using an ion exchange membrane. An aqueous solution of alkali metal hydroxide obtained by electrolysis is either used as an alkali metal hydroxide to be added to acid solutions or is used in solvent extraction. The acid obtained by electrolysis is used as a mineral acid.
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
B09B 5/00 - Opérations non couvertes par une seule autre sous-classe ou par un seul autre groupe de la présente sous-classe
C22B 3/06 - Extraction de composés métalliques par voie humide à partir de minerais ou de concentrés par lixiviation dans des solutions inorganiques acides
C22B 3/20 - Traitement ou purification de solutions, p. ex. de solutions obtenues 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 3/26 - Traitement ou purification de solutions, p. ex. de solutions obtenues par lixiviation par extraction liquide-liquide utilisant des composés organiques
C22B 3/44 - Traitement ou purification de solutions, p. ex. de solutions obtenues par lixiviation par des procédés chimiques
Provided is a treatment method for chlorine gas whereby chlorine gas generated when a battery powder is dissolved in hydrochloric acid to leach a valuable metal using the hydrochloric acid can be rendered harmless or used effectively. This treatment method for chlorine gas generated when a battery powder containing a valuable metal obtained from a waste lithium ion battery is dissolved in hydrochloric acid to leach the valuable metal using the hydrochloric acid includes a step for reacting the chlorine gas with at least one substance selected from the group consisting of reducing agents, alkali metal hydroxides and alkaline earth metal hydroxides. Examples of the reducing agent include: a first aqueous ferrous chloride solution containing ferric chloride; and hydrogen gas.
With respect to recovery of a valuable metal from a waste lithium ion battery (LiB) and a waste material from the LiB production, the purpose of the present invention is to solve: the problem of recovering a valuable metal from an active material powder that is obtained by subjecting the waste LiB and the waste material from the LiB production to a pretreatment (discharging, heat treatment, pulverization and classification); and the problem of recovering and circulating carbon dioxide. A method for processing a waste lithium ion battery according to the present invention is characterized by comprising: a step in which an active material powder is obtained by subjecting a waste lithium ion battery to operations such as discharging, heat treatment, pulverization and classification; a combustion step in which the carbon content in the active material powder is combusted so as to be converted into carbon dioxide; a carbon dioxide recovering step in which the carbon dioxide generated during the combustion of the active material in the combustion step is absorbed and carbonated; a wet treatment step in which the active material powder combusted in the combustion step is wet dissolved, thereby forming a solution of a valuable metal in the active material; and a lithium carbonation step in which lithium carbonate is obtained by adding carbon dioxide, which has been absorbed in the carbon dioxide recovering step, into a lithium solution.
Provided is a waste lithium-ion battery treatment method capable of obtaining battery powder without the need to treat fluorine generated by pyrolysis. The present invention is characterized in that a waste lithium-ion battery is heat-treated in a range of temperature at which an electrolyte evaporates to dry or higher but lower than a temperature at which a fluorine resin is pyrolyzed.
The present invention provides a method for producing a high-purity aqueous lithium salt solution, said method being capable of separating aluminum phosphate by filtration in a short period of time. This method for producing a high-purity aqueous lithium salt solution comprises: a step wherein the pH of a slurry that contains a mixture of aluminum hydroxide and lithium phosphate obtained from a first aqueous lithium salt solution, which is a starting material, is adjusted within the range of from 2 to 3, thereby obtaining a sediment of aluminum phosphate; a step wherein the sediment of aluminum phosphate is removed by being separated by means of filtration, thereby obtaining a second aqueous lithium salt solution; and a step for obtaining a high-purity aqueous lithium salt solution by purifying the second aqueous lithium salt solution.
A lithium carbonate production device is provided which can efficiently produce lithium carbonate without requiring a large pressure for supplying carbon dioxide gas, by a simple structure. A lithium carbonate production device (1) includes: a sealed reaction tank (2) which stores a lithium hydroxide aqueous solution A; a supply unit (3) for the lithium hydroxide aqueous solution; a carbon dioxide gas supply unit (4); a circulation unit (21) for the lithium hydroxide aqueous solution; and a nozzle which is provided at the head of the circulation unit (21) for the lithium hydroxide aqueous solution, and has a diameter which gradually decreases from a base end side to a head side.
B01J 19/00 - Procédés chimiques, physiques ou physico-chimiques en généralAppareils appropriés
B01J 19/26 - Réacteurs du type à injecteur, c.-à-d. dans lesquels la distribution des réactifs de départ dans le réacteur est effectuée par introduction ou injection au moyen d'injecteurs
B01J 4/00 - Dispositifs d'alimentationDispositifs de commande d'alimentation ou d'évacuation
Provided is a lithium carbonate production device that does not require large pressure to supply a carbonic acid gas, and that can efficiently produce lithium carbonate with a simple configuration. A lithium carbonate production device 1 comprises: a sealed reaction vessel 2 that stores a lithium hydroxide solution A; a lithium hydroxide solution supply means 3; a carbonic acid gas supply means 4; a lithium hydroxide solution circulation means 21; and a nozzle provided to a tip end of the lithium hydroxide solution circulation means 21, the nozzle configured so that the diameter thereof is gradually reduced from the base end toward the tip end.
Provided is a novel use application of 5-methyl-2-hexanone. An extraction agent for metals contains 5-methyl-2-hexanone as an active ingredient, and can be used for the extraction of a chlorine complex or a fluorine complex of a metal capable of forming a chlorine complex or a fluorine complex from an aqueous solution of the chlorine complex of the metal or an aqueous solution of the fluorine complex of the metal.
C22B 3/26 - Traitement ou purification de solutions, p. ex. de solutions obtenues par lixiviation par extraction liquide-liquide utilisant des composés organiques
C22B 61/00 - Obtention des métaux non prévus ailleurs dans la présente sous-classe
30.
Method for recovering rhenium, method for selectively recovering rhenium from solution including rhenium and other metals, and method for increasing content ratio of rhenium in solution including rhenium and other metals
A method is provided which can separate rhenium from a solution containing rhenium by a simple procedure in a shorter time. A method of selectively recovering rhenium from a solution containing rhenium and one or more different metals is also provided. A method of recovering rhenium is used. The method involves (A) adding an electron donor (aliphatic secondary alcohol or aliphatic secondary thioalcohol) and a ketone compound to a solution containing perrhenate ions, (B) irradiating the solution after the addition step with ultraviolet light to precipitate a reduced species of the perrhenate ions contained in the solution, and (C) separating the reduced species of perrhenate ions from the solution, the reduced species being precipitated during the ultraviolet light irradiation.
C22B 3/44 - Traitement ou purification de solutions, p. ex. de solutions obtenues par lixiviation par des procédés chimiques
31.
METHOD FOR RECOVERING RHENIUM, METHOD FOR SELECTIVELY RECOVERING RHENIUM FROM SOLUTION INCLUDING RHENIUM AND OTHER METALS, AND METHOD FOR INCREASING CONTENT RATIO OF RHENIUM IN SOLUTION INCLUDING RHENIUM AND OTHER METALS
[Problem] To provide a method allowing for the separation of rhenium from a solution including rhenium by a simple procedure and in a shorter amount of time, and to provide a method for selectively recovering rhenium from a solution including rhenium and other metals. [Solution] A method for recovering rhenium, said method characterized by including: an addition step for adding an electron donating agent, which is an aliphatic secondary alcohol or an aliphatic secondary thioalcohol, and a ketone compound to a solution including perrhenate ions; an ultraviolet irradiation step for precipitating a reductant of the perrhenate ions included in the solution by irradiating the solution, which has undergone the addition step, with ultraviolet rays; and a fractionation step for fractionating, from the solution, the reductant of the perrhenate ions obtained by precipitation at the ultraviolet irradiation step.
[Problem] To provide a coating solution which, when used for coating, enables the formation of an antireflective film having an improved high light transmittance, high surface hardness and a stain-proof function. [Solution] A coating solution prepared by dispersing colloidal silica and titania-silica in a solvent, wherein the ratio of the total molar amount of a silicon element that constitutes the solution to the total molar amount of a titanium element that also constitutes the solution (i.e., Si/Ti) is adjusted to 3 or more (i.e., Si/Ti ≥ 3), preferably 24 or more. When the coating solution is used for, for example, coating the surface of a lighting part for power generation purposes in a solar cell, it becomes possible to form an antireflective film, in which the light transmittance is increased by 1.5% or more and the surface hardness is 6H or more as measured by a scratching hardness test (a pencil method; JIS K5600-5-4) and which can exhibit a stain-proof function by the photocatalytic action of titania-silica, readily at a low temperature.
C09D 5/00 - Compositions de revêtement, p. ex. peintures, vernis ou vernis-laques, caractérisées par leur nature physique ou par les effets produitsApprêts en pâte
H01L 31/04 - Dispositifs à semi-conducteurs sensibles aux rayons infrarouges, à la lumière, au rayonnement électromagnétique d'ondes plus courtes, ou au rayonnement corpusculaire, et spécialement adaptés, soit comme convertisseurs de l'énergie dudit rayonnement e; Procédés ou appareils spécialement adaptés à la fabrication ou au traitement de ces dispositifs ou de leurs parties constitutives; Leurs détails adaptés comme dispositifs de conversion photovoltaïque [PV]
33.
METHOD FOR SEPARATING RARE EARTH ELEMENTS FROM OPTICAL GLASS WASTE
The present invention addresses the problem of separating with good efficiency the rare earths of La and Gd from optical glass waste. Carbon is added to pulverized optical glass waste and the mixture is subjected to reduction roasting in a nonoxidizing atmosphere in order to reduce the zinc oxide to zinc, and the zinc is selectively evaporated and removed. After the rare earth elements remaining in the roasting residue are eluted with hydrochloric acid or nitric acid, the Gd is extracted into the organic phase under acidic conditions at a pH of 2 or less using the extractant PC-88A (Daihachi Chemical Industry Co., Ltd., brand name). The La remaining in the aqueous phase is extracted into the organic phase under acidic conditions at a pH of 3 to 4 using the extractant PC-88A (Daihachi Chemical Industry Co., Ltd., brand name).
C22B 59/00 - Obtention des métaux des terres rares
B09B 3/00 - Destruction de déchets solides ou transformation de déchets solides en quelque chose d'utile ou d'inoffensif
C22B 3/26 - Traitement ou purification de solutions, p. ex. de solutions obtenues par lixiviation par extraction liquide-liquide utilisant des composés organiques
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
[Problem] To provide a water treatment device and water treatment method that increase the elimination efficiency for phosphorus. [Solution] In a water treatment system in which the phosphorus included in water to be treated is eliminated by being brought into contact with a phosphorus eliminating filter medium, the phosphorus eliminating filter medium is obtained by mixing slag with an average particle size of 0.1 mm or less with a clayey binder, granulating the mixture into particles with an average particle size of 0.3 mm or less and firing same. The water treatment system is provided with: a mixing tank in which the phosphorus eliminating filter medium is added to water to be treated; a filter medium adding device that adds the phosphorus eliminating filter medium to the mixing tank; a sedimentation separation tank or solid-liquid separation device that separates the phosphorus eliminating filter medium from the water to be treated, from which the phosphorus has been eliminated, by solid-liquid separation performed on the water to be treated that contains the phosphorus eliminating filter medium discharged from the mixing tank; and a filter medium adding device that re-adds the phosphorus eliminating filter medium separated from the water to be treated by the sedimentation separation tank or solid-liquid separation device or the phosphorus eliminating filter medium in which part of the phosphorus eliminating filter medium is extracted and undergoes reactivation treatment to the stirring tank, which has been supplied with new water to be treated.
[Problem] To accelerate the discharge of gas generated during the decomposition of hydrogen peroxide from a decomposition material layer and suppress a decrease in decomposition efficiency due to the retention of bubbles of the gas in the decomposition material layer when the hydrogen peroxide is decomposed by passing water to be treated through the decomposition material layer filled with a granular decomposition material. [Solution] A hydrogen peroxide decomposition device has a configuration provided with: a decomposition tower through which water to be treated containing hydrogen peroxide is passed; a decomposition material layer which is formed by filling a granular decomposition material for decomposing the hydrogen peroxide into water and oxygen onto a support member that is disposed in the decomposition tower and has a plurality of water passage holes; a supply unit which supplies the water to be treated from the bottom side of the decomposition tower such that the water to be treated passes the decomposition material layer in an upward flow through the water passage holes of the support member; and a plurality of gas drainage flow adjustment rods which are supported on the support member disposed in the decomposition tower, extend from the lower surface of the decomposition material layer and protrude from the upper surface thereof, and are disposed at intervals within the decomposition layer.
Disclosed is a method for producing soil-resistant glass, the surface of which is covered with a coating film having a high film hardness. Also disclosed is soil-resistant glass. Specifically, a photocatalyst solution that contains titania or/and titania-silica having a photocatalytic function is coated over the surface of glass and heated at a temperature that is at least more than 100˚C, thereby forming a coating film that contains titania or/and titania-silica. The heating temperature is higher than 100˚C, and may be 300˚C or less. The time period to be heated at the heating temperature may be at least 2 minutes.
Provided are a water treatment method and a water treatment system with which COD (Chemical Oxygen Demand) can be eliminated at a high elimination rate. It is possible to eliminate COD at a high elimination rate by means of a structure wherein a chlorine oxidizer is added to water that contains organic matter and that is to be treated by COD elimination; the water is then passed through a manganese filter material(62); and the organic matter is decomposed by catalytic oxidation. It is also possible to use a structure whereby after the decomposition by catalytic oxidation in this case, the water is passed through an adsorption device (7) containing active carbon (71). It is further possible to use a structure whereby a coagulant is added before the water is passed through the manganese filter material(62) and the suspended matter is removed by a filtration device (4).
Provided are a water treatment method and a water treatment system whereby COD (Chemical Oxygen Demand) can be removed at a high removal rate. A method for removing COD comprising adding a chlorine-based oxidizing agent to organic matter-containing water to be treated and passing the water through a manganese-based filtering material to thereby catalytically oxidize and decompose the organic matters, wherein said manganese-based filtering material comprises a natural manganese dioxide (MnO2) crystal powder containing β-MnO2 which is held on the surface of a granular support by using a binder, without sintering or baking the crystal powder or heating the same to a temperature at which the crystalline transformation of β-MnO2 occurs.
A method of noble-metal separation/recovery by which noble metal ingredients can be efficiently isolated by a simple procedure using an easily available adsorbent and eluent. The method comprises passing through a cellulose column a metal hydrochloric-acid solution prepared by treating a metallic material with hydrochloric acid, passing a mixture of hydrochloric acid and 2-propanone to elute the noble metal ingredients adsorbed on the cellulose while developing them and thereby separate the metal hydrochloric-acid solution into a fraction containing light platinum-group metals and a fraction containing heavy platinum-group metals and gold, further separating the fraction containing light platinum-group metals into fractions respectively containing palladium, ruthenium, and rhodium using that mixture, separating the fraction containing heavy platinum-group metals and gold into fractions respectively containing gold, osmium, iridium, and platinum using a mixture of hydrochloric acid and 1-butanol, and then separately recovering the noble metals from the respective fractions as the elemental metals.
A method for separation and recovery of noble metals which makes it possible to isolate noble metal components efficiently by easy operation, that is, a method which comprises passing a solution of metals in hydrochloric acid prepared by treating a metal material with hydrochloric acid through the first cellulose column, eluting through development the noble metal component adsorbed on the cellulose with a hydrochloric acid/2-propanone mixture to obtain a fraction containing light platinum-group metals and a fraction containing heavy platinum -group metals and gold, separating the former fraction with the above mixture into fractions containing palladium, ruthenium and rhodium respectively, passing the fraction containing heavy platinum-group metals and gold through the second cellulose column to made them adsorbed on the cellulose, eluting them from the cellulose with a hydrochloric acid/1-butanol mixture to obtain fractions containing gold, osmium, iridium and platinum respectively, and recovering the noble metals from the fractions containing them respectively as simple substances.
C22B 3/04 - Extraction de composés métalliques par voie humide à partir de minerais ou de concentrés par lixiviation
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
C01G 55/00 - Composés du ruthénium, du rhodium, du palladium, de l'osmium, de l'iridium, ou du platine
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