title: The adsorption of silver on potassium cyanocobalt(II)ferrate(II).
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.
authors.affiliation: Zentralinstitut für Analytische Chemie der Kernforschungsanlage Jülich, 517 Jülich, Bundesrepublik Deutschland.
authors.forename: M
authors.initials: M
authors.lastname: Wald
authors.forename: W
authors.initials: W
authors.lastname: Soyka
authors.forename: B
authors.initials: B
authors.lastname: Kaysser