Ural State Mining University, Ekaterinburg, Russia

A. E. Pelevin, Dr. Eng., Prof., Associate Prof., Dept. of Mineral Processing, e-mail: a-pelevin@yandex.ru

The possibility of using wet magnetic separation for preliminary enrichment of finely crushed ore has been studied. Using titanomagnetite ore with a particle size of 13+0 mm as an example, tests of dry and wet separation were carried out in three modes, ensuring a yield of nonmagnetic product from 15 to 35 %. Dry separation modes were changed by rotating the gate at a constant magnetic field induction of 0.15 Tesla. During wet separation, each mode corresponded to magnetic field inductions of 0.3, 0.35 and 0.4 Tesla. For dry enrichment, a separator with a top feed of material is used, for wet enrichment, a separator with a bottom feed of material is used. The use of wet magnetic separation for pre-enrichment has shown greater efficiency. With the same mass fraction of iron in tailings, their yield is greater when using wet magnetic separation compared to dry one. The obtained middling products of magnetic separations are enriched according to a three-stage grinding and enrichment scheme to obtain concentrates for pelletizing with a mass fraction of iron of 62%. The use of wet magnetic separation compared to dry one made it possible, in general, according to the titanomagnetite ore enrichment scheme, to increase the extraction of iron into the concentrate by 0.6–0.77 % while reducing the mass fraction of iron in the total tailings by 0.11–0.14 %. However, the quality of the concentrate has not changed.

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