Ural State Mining University, Ekaterinburg, Russia

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

The possibility of obtaining a superconcentrate for nonblast-furnace iron production using technology using a four-stage grinding scheme and fine screening in the second and third stages of grinding has been studied. Three four-stage schemes for grinding and beneficiation of titano-magnetite ore were tested in laboratory conditions, differing in the sizes of the screening sieves used in the second (0.4–0.63 mm) and third (0.1–0.315 mm) stages of grinding. The tested four-stage schemes with fine screening in the second and third stages made it possible to obtain super-concentrates (66.05–66.4% Fe), suitable for metallization and nonblast-furnace iron production. The mass fraction of titanomagnetite in the obtained concentrates was more than 95%. The maximum concentrate yield (16.02%) and iron recovery into the concentrate (67.61%) were achieved using a screening scheme with an increased size of the sieve openings (0.63 and 0.315 mm) in the second and third stages of grinding. The scheme using screens with large sieve openings in the second and third stages of grinding makes it possible to reduce the overgrinding of rock and ore minerals in the second and third stages and to prepare the middling product for subsequent production of superconcentrate from it using wet magnetic separation after the fourth stage of ball grinding. Features of the tested schemes are the removal of tailings in larger sizes in the second and third stages of grinding and the implementation of the main grinding and opening of minerals in the last stage of ball grinding.

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