NIOBIUM PENTOXIDE PREPARATION PROCESS Russian patent published in 2004 - IPC

Abstract RU 2237738 C2

FIELD: inorganic compounds technology.

SUBSTANCE: invention relates to hydrometallurgical processing of tantalum raw material and consists in that, in order to remove impurities, niobium raffinate, after extraction of tantalum with tributyl phosphate, is partially neutralized and resulting hydroxide is dissolved in subsequent raffinate portions, after which acidified with hydrofluoric and sulfuric acids to form solution containing, g/l: Nb ~60, HF ~70, H2SO4 350-400. This solution is subjected to extraction of niobium in 5 countercurrent stages at organic phase/aqueous phase ratio 0.7:1 and in 3 countercurrent stages at organic phase/aqueous phase ratio 1:0.7. As a result, refined niobium solution is obtained, from which niobium pentoxide is prepared as commercial product using techniques well known to those in the art.

EFFECT: enabled preparation commercial niobium pentoxide by processing composition-unstable columbo-tantalite concentrates.

2 cl, 1 tbl

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RU 2 237 738 C2

Authors

Kazantsev Valerij Nikolaevich

Berezko Vladimir Vasil'Evich

Zhukov Valerij Vasil'Evich

Dates

2004-10-10Published

2002-04-01Filed