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2 087 566

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C1

(51)

IPC

(21) (22)

Application

95114773/02, 1995-08-15

(22)

Actual filing date

1995-08-15

(45)

Published

1997-08-20

(72)

Inventor

Potapova A.I.Nikonova E.S.Ershov V.P.Stel'Kina I.I.

(73)

Holder

Aktsionernoe Obshchestvo

METHOD OF PROCESSING ZINC PRECIPITATES Russian patent published in 1997 - IPC

Abstract RU 2087566 C1

FIELD: precious metal hydrometallurgy. SUBSTANCE: in a method of processing zinc precipitates including hydrochloric acid leaching, precipitate obtained is additionally leached with hydrofluoric acid to produce gold-containing solution and silver/lead chloride precipitate. Hydrofluoric acid solution is treated by known method to precipitate gold, whereas silver/lead chloride precipitate is leached with ammonium acetate solution to leach lead. Once lead acetate is separated, silver chloride is reduced by known procedure. Gold and silver precipitates are processed in separate cycles. EFFECT: ensured selectivity of gold and silver recovery. 2 cl, 2 tbl

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RU 2 087 566 C1

Authors

Potapova A.I.

Nikonova E.S.

Ershov V.P.

Stel'Kina I.I.

Dates

1997-08-20—Published

1995-08-15—Filed

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