The adsorption of silver on potassium cyanocobalt(II)ferrate(II) |
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Authors: | Wald M Soyka W Kaysser B |
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Institution: | Zentralinstitut für Analytische Chemie der Kernforschungsanlage Jülich, 517 Jülich, Bundesrepublik Deutschland. |
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Abstract: | A procedure is described for recovering silver from industrial sewage (mining and photo-industry etc) with the aid of the ion-exchanger potassium cyanocobalt(II)ferrate(II) (KCFC). Silver is easily removed by simple mixing with KCFC, even from solutions containing less than 1 g of silver per ton of solution. The process is performed at room temperature at pH < 7. There is no interference from a 600-fold amount of Ca, Cu(II), Zn, Cd, Pb, and Fe(II). Pure silver may be obtained by dissolution of the ion-exchanger in potassium cyanide solution, subsequent precipitation as sulphide, and roasting, or by melting it out of the ion-exchanger after heat treatment in a high-frequency furnace. With 1 kg of KCFC, 1.25 kg of silver may be extracted from solution. The process is simple and economic. |
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