COMBINED CARBOTHERMAL METHOD FOR PROCESSING PEROVSKITE CONCENTRATE IN VACUUM WITH PRODUCTION OF CALCIUM AND TITANIUM SLAG

摘要

1. A method of opening a perovskite concentrate in vacuum by combined carbothermal processing, characterized in that in one step a charge is prepared consisting of a perovskite concentrate and a carbon-containing material, suitable for the formation of calcium carbide and titanium carbide (oxycarbide), followed by the dissociation of calcium carbide into elemental calcium and graphite. 2. The method according to claim 1, characterized in that the process is carried out in a vacuum in one apparatus in two stages: the first - the formation of a solid mixture of calcium carbide and titanium carbide (oxycarbide) - is carried out at a temperature (1100-1300 ° C) and a residual pressure of 10 100 Pa; the second - the dissociation of calcium carbide to obtain elemental calcium and carbon - is carried out at a temperature of 1400-1500 ° C and a pressure of less than 10 Pa. 3. The method according to claim 1, characterized in that the high-temperature treatment of the charge produces a slag consisting mainly of titanium carbide (oxycarbide), which is well chlorinated at lower temperatures. The method according to claim 1, characterized in that high-temperature treatment of the charge produces a slag suitable for chlorination according to the existing technology without preliminary preparation (without charging carbon-containing materials). The method according to claim 1, characterized in that during the high-temperature treatment of the charge in two stages, the valuable components contained in the perovskite concentrate (such as tantalum, niobium and rare earth metals) are concentrated in the residue after the distillation of calcium in the first stage of the process and can be utilized according to existing chlorine technology.