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2 147 619

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IPC

(21) (22)

Application

98113999/02, 1998-07-23

(24)

Start date

1998-07-23

(22)

Actual filing date

1998-07-23

(45)

Published

2000-04-20

(72)

Inventor

Smelov V.S.Chubukov V.V.

(73)

Holder

Gosudarstvennyj Nauchnyj Tsentr Rossijskoj Federatsii Vserossijskij Nauchno-Issledovatel'Skij Institut Neorganicheskikh Materialov Im.Akad.A.A.Bochvara

METHOD FOR PRECIPITATION OF PLATINOIDS DURING EXHAUSTED NUCLEAR FUEL PROCESSING Russian patent published in 2000 - IPC

Abstract RU 2147619 C1

FIELD: hydrometallurgy. SUBSTANCE: platinoids are precipitated from high-activity nitrate solutions using formaldehydesulfoxylic acid sodium salt as precipitating agent in amounts corresponding following relationship: logN = 1.7 +0.8log[HNO₃] where N is molar ratio of precipitating agent excess to platinoids and [HNO₃] molarity of nitric acid. Optimum precipitation temperature lies within a range of 70 to 80 C. Method allows determining combination of physico-chemical conditions for selective recovery of platinoids from solutions containing more than one dozen of dissolved metals. EFFECT: enabled quantitative recovery (>99%), high selectivity and purification of platinoids (10³ in average). 5 cl, 4 tbl, 3 ex

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RU 2 147 619 C1

Authors

Smelov V.S.

Chubukov V.V.

Dates

2000-04-20—Published

1998-07-23—Filed