METHOD OF RECOVERING SILVER
PROBLEM TO BE SOLVED: To provide a method of efficiently recovering silver of high purity from a silver solution of low concentration by a simple device.SOLUTION: The method of recovering silver includes: extracting silver in a solvent from an acid aqueous solution whose silver concentration is equa...
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| creator | HATANO KAZUHIRO ONO EIKI |
| description | PROBLEM TO BE SOLVED: To provide a method of efficiently recovering silver of high purity from a silver solution of low concentration by a simple device.SOLUTION: The method of recovering silver includes: extracting silver in a solvent from an acid aqueous solution whose silver concentration is equal to or lower than 100 mg/L with tributyl phosphate as an extraction agent; and then recovering the silver in the solvent, wherein it is preferable that the silver quality of the recovered object of the silver is equal to or higher than 50%. Further, the extraction pH in the solvent extraction of silver is controlled to be equal to or below 1.0. The process of recovering the silver in the solvent includes a step of back-extracting the silver from the solvent containing the silver and a step of recovering the silver by cementation from a silver solution obtained by back extraction. When cementation is performed using copper components, the liquid from which the silver is separated after the cementation is supplied to a back extraction agent and repeatedly used. As the back extraction agent, a sodium thiosulfate solution, hydrochloric acid, a saline solution or nitric acid whose silver concentration is equal to or higher than 0.5 g/L is used. |
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Further, the extraction pH in the solvent extraction of silver is controlled to be equal to or below 1.0. The process of recovering the silver in the solvent includes a step of back-extracting the silver from the solvent containing the silver and a step of recovering the silver by cementation from a silver solution obtained by back extraction. When cementation is performed using copper components, the liquid from which the silver is separated after the cementation is supplied to a back extraction agent and repeatedly used. 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Further, the extraction pH in the solvent extraction of silver is controlled to be equal to or below 1.0. The process of recovering the silver in the solvent includes a step of back-extracting the silver from the solvent containing the silver and a step of recovering the silver by cementation from a silver solution obtained by back extraction. When cementation is performed using copper components, the liquid from which the silver is separated after the cementation is supplied to a back extraction agent and repeatedly used. 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Further, the extraction pH in the solvent extraction of silver is controlled to be equal to or below 1.0. The process of recovering the silver in the solvent includes a step of back-extracting the silver from the solvent containing the silver and a step of recovering the silver by cementation from a silver solution obtained by back extraction. When cementation is performed using copper components, the liquid from which the silver is separated after the cementation is supplied to a back extraction agent and repeatedly used. As the back extraction agent, a sodium thiosulfate solution, hydrochloric acid, a saline solution or nitric acid whose silver concentration is equal to or higher than 0.5 g/L is used.</abstract><oa>free_for_read</oa></addata></record> |
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| subjects | CHEMISTRY CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS FERROUS OR NON-FERROUS ALLOYS GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS METALLURGY PRETREATMENT OF RAW MATERIALS PRODUCTION AND REFINING OF METALS TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE TREATMENT OF ALLOYS OR NON-FERROUS METALS |
| title | METHOD OF RECOVERING SILVER |
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