METHOD OF NOBLE METAL EXTRACTION Russian patent published in 2013 - IPC C22B11/00 C22B3/44

Abstract RU 2494159 C1

FIELD: metallurgy.

SUBSTANCE: method of noble metal extraction from solid stock comprises dissolving of noble metal and base metals in acid. Noble metal is extracted with the help of substituted quaternary ammonium salts (SQAS). Noble metal can be oxidised and reduced. Said substituted quaternary ammonium salts represent the following form H_0-3R_4-1NX, where H= hydrogen, R= organic group, N= nitrogen and X= halogen. This method uses, for example, tetramethyl ammonium chloride. Au-SQAS is separated by flushing with solvent. Rh-SQAS is dissolved in acid and oxidised to precipitate the salts, and separated. SQAS is added to filtrate and cooled to precipitate Rh-AQAS to be separated. Rh-SQAS is cleaned before formation of final product. Other metals are separated by boiling the initial acid solution with precipitation of metal salts, cooling and separation. The pulp is separated by dissolution and separation.

EFFECT: simplified extraction.

20 cl, 4 dwg, 4 tbl, 2 ex

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RU 2 494 159 C1

Authors

Tomas Dzhozef L.

Brem Dzheral'D F.

Dates

2013-09-27—Published

2011-05-02—Filed