C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 3/14 (2006.01) C22B 3/10 (2006.01) C22B 7/00 (2006.01) C22B 34/24 (2006.01)
Patent
CA 2356988
The invention relates to a process for treating tantalum and/or niobium containing raw materials such as wastes, slags, concentrates and ores. The tantalum and/or niobium containing raw materials are processed by repeated use of a solution of ammonium fluoride. From the tantalum and niobium containing aqueous solution a mixture of fluorides and oxide fluorides of tantalum and niobium are transformed into a firm condition. At an extraction stage pure, aqueous solutions containing fluoro acid complexes of niobium and fluoroammonium complexes of tantalum are obtained. From these tantalum and niobium are obtained as oxides in pure form by precipitating them as fluoride containing oxide hydrates by addition of ammonia. The obtained oxide hydrates are transformed into pure oxides by calcining at high temperatures.
L'invention concerne un procédé permettant de traiter des matières premières contenant du tantalum et/ou du niobium, tels que des déchets, des scories, des concentrés et des minerais. Les matières premières contenant du tantalum et/ou du niobium sont traitées de façon répétée avec une solution de fluorure d'ammonium. A partir de la solution aqueuse contenant du tantalum et du niobium, un mélange de fluorures et d'oxydes de fluorures de tantalum et de niobium est transformé dans un état ferme. Au niveau d'un étage d'extraction, on obtient des solutions aqueuses pures contenant des complexes d'acide fluoré de niobium et des fluorocomplexes d'ammonium de tantalum. A partir de là, on obtient du tantalum et du niobium comme oxydes de forme pure par leur précipitation comme fluorures contenant des hydrates d'oxyde par addition d'ammoniaque. Les hydrates d'oxyde obtenus sont transformés en oxydes pures par calcination à des températures élevées.
Galaganov Nikolai
Krupin Aleksandr.
Krupin Aleksandr.
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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