Ural State Mining University (Ekaterinburg, Russia):

Pelevin A. E., Professor, Doctor of Engineering Sciences, Assistant Professor, a-pelevin@yandex.ru

One of the promising methods for improving the quality of magnetite concentrate is its processing in a high-frequency alternating magnetic field, when magnetite particles are subjected to alternating processes of demagnetization and magnetization. This leads to the removal of rock particles from the floccules and higher magnetite mass fractions in the concentrate. The studies were completed using laboratory drum separators for wet and dry processing with a rotating magnetic system. In order to improve the concentrate quality at Vysokogorsky GOK, circuits with and without grinding were tested. The use of magnetic separation in an alternating magnetic field enabled improving the mass fraction of iron in the concentrate by 4.12 % (without grinding) and 5.68 % (with grinding). An increase in the frequency of the alternating magnetic field from 80 to 200 Hz resulted in an increase in the mass fraction of iron in the concentrate from 66.6 to 68.0 % in the circuit with additional concentrate grinding. The performance of a drum separator with a traveling magnetic field decreases with higher frequencies of the alternating magnetic field. This is due to a decrease in the velocity with which the magnetic particles recovered are transported to the concentrate discharge zone. Higher sizes of particles processed require lower alternating magnetic field frequencies. For the ore of the Sutarskoe deposit, the use of separation in an alternating magnetic field rendered high-grade magnetite concentrate with the mass fraction of iron of 69.9 % and silicon dioxide of 2.5 %, suitable for the metallization process. Material processing in an alternating magnetic field allows reducing the mass fraction of harmful impurities in the concentrate. In the processing of sulfide magnetite ore, the mass fraction of sulfur in the concentrate was reduced from 2.71 to 0.92 %.

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