A. A. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Moscow:

K. G. Anisonyan, Senior Researcher, e-mail: kanisonyan@imet.ac.ru
D. Yu. Kopyev, Researcher
T. V. Olyunina, Senior Researcher
G. B. Sadykhov, Head of Laboratory, Chief Researcher

The paper presents the results of studies on the beneficiation of leucoxene ore from the Yaregskoe deposit (Komi Republic) with preliminary thermal petroleum removing by water vapor. It was shown that heat treatment of oil-bearing leucoxene ore allows to achieve complete extraction of oil into a separate fraction (8–9% by weight of the original ore) at heat treatment temperatures of 550–600 ^oC. The beneficiation possibility of the mineral part of the ore by electrostatic and magnetic separation methods was studied. It has been established that the use of electrostatic separation does not allow complete selective removal of free quartz grains due to the fact that during the thermal distillation, oil pyrolysis occurs, resulting in the formation of coke residue, which is located on the surface of ore grains in the form of thin films. In this regard, the possibility of electrostatic separation with preliminary washing of ore from oil with an organic solvent was investigated. At the same time, the through yield of the conductive fraction was 16% with a TiO₂ content of 40–50%. An increase in the number of purifications leads to a decrease in titanium extraction (up to 65–70%). Significant heterogeneity of the distribution of components by fractions occurs due to the presence of leucoxene and quartz intergrowths in the concentrate, which distribute the charge non-uniformly. Due to the fact that the resulting coke residue during pyrolysis can be used as a reducing agent, a combined process of heat treatment of ore was carried out, which combine the operations of oil distillation (550–600 ^oC) and magnetizing roasting (1100–1200 ^oC). As a result of magnetic separation of the reduced ore, a rich leucoxene concentrate (65% TiO₂) was obtained with TiO₂ extraction of about 90%. This combined process of heat treatment of oil-saturated leucoxene ore with subsequent magnetic separation will increase the efficiency of its beneficiation in comparison with the flotation method.

This work is supported by the Basic Research Program of the Presidium of the Russian Academy of Sciences №39 (Registration number R&D AAAA-A18-118032090120-7).

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