A. V. Topchiev Institute of Petrochemical Synthesis RAS, Moscow, Russia:

K. L. Zanaveskin, Senior Researcher, e-mail: zakon82@mail.ru

L. N. Zanaveskin, Head of a Sector, e-mail: zanaveskin@ips.ac.ru

Karpov Scientific Research Institute of Physics and Chemistry, Obninsk, Russia:
A. N. Maslennikov, Junior Researcher, e-mail: anmaslennikoff@gmail.com
M. N. Makhin, Senior Researcher, e-mail: makhin.maxim@gmail.com

More than a half of Russian titanium ore reserves is placed in Yaregskoe oiltitanium deposit (Komi Republic). As a result of this ore concentration, leucoxene concentrate is obtained, containing up to 65% of TiO₂ and ~30% of SiO₂. Leucoxene is a titanium carrier in concentrate. It is impossible to refinine the concentrate to >65% of TiO₂ by physical separation methods. We considered the peculiarities of the process of autoclave leaching concentration of such concentrate and experimentally proved, that the concentrated product is suitable for reprocessing with TiCl₄ obtaining in boiling layer reactors. Physical properties of raw materials (including its durability, shape and particle size) are important for the process of reduction chlorination in boiling layer reactors. We experimentally investigated the influence of leucoxene concentrate grain sizes on its concentration process by leaching using water solution NaOH, and on the concentrated raw materials chlorination in boiling layer reactor. Granulometric composition of autoclave concentrate makes a significant influence on its processing with TiCl₄ obtaining in boiling layer reactor. On the one hand, application of ground raw materials allows the slight increasing of the reaction rate, on the other — leads to increasing of dust burden of TiO₂ from reaction mass. At the same time, the grain size of quartz-leucoxene concentrate has almost no influence on its processing rate with obtaining of autoclave concentrate by leaching method. It is better to use the quartz-leucoxene concentrate with natural grain size for decreasing of TiO₂ losses.
The investigation was carried out with the support of the grant of Russian Scientific Fund (project No. 15-13-00171).

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