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IPC

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Application

98104347/02, 1998-03-10

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Start date

1998-03-10

(22)

Actual filing date

1998-03-10

(45)

Published

2000-04-20

(72)

Inventor

Voropanova L.A.

(73)

Holder

Voropanova Lidija Alekseevna

METHOD OF REMOVING IMPURITIES FROM PRECIOUS METALS Russian patent published in 2000 - IPC

Abstract RU 2147618 C1

FIELD: precious metal purification. SUBSTANCE: impurities are extracted with oleic acid/triethanolamine mixture in inert diluent (motor oil) continuously maintaining optimal pH value. In particular, extractant may contain 10- 12% oleic acid and 4.5-6.0% triethanolamine. Selective removal of impurities from aqueous solutions of precious metals can be achieved by performing fractional extraction by gradually increasing or decreasing pH value and maintaining this value constant in each step of periodical extraction process. EFFECT: enhanced efficiency of process involving low-volatile and accessible extractant. 4 cl, 3 dwg, 1 tbl, 3 ex

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RU 2 147 618 C1

Authors

Voropanova L.A.

Dates

2000-04-20—Published

1998-03-10—Filed

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