METHOD FOR OPENING PEROVSKITE CONCENTRATE Russian patent published in 2014 - IPC C22B5/10 C22B26/20 C22B34/12 C22B34/24 C22B59/00 

FIELD: metallurgy.

SUBSTANCE: method involves carbothermal vacuum treatment. Prior to carbothermal treatment, a charge is prepared, which consists of perovskite concentrate and carbon-containing material in the ratio suitable for formation of calcium carbide, and titanium carbides and oxycarbides. Opening is performed in one unit in two stages. At the first stage, carbothermal treatment is performed at the temperature of 1100-1300°C and residual pressure of 10-100 Pa so that solid mixture of calcium carbides and titanium carbides and oxycarbides is obtained. The second stage is performed at the temperature of 1400-1500°C and pressure of 5-10 Pa for dissociation of calcium carbide and its stripping so that elementary calcium and carbon is obtained and with concentration in the residue of precious components of titanium, tantalum, niobium and rare-earth metals, which are contained in perovskite concentrate and are subject to chlorination.

EFFECT: improving specific productivity, reducing technological operations and use of a cheap reducing agent - carbon-containing materials.

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