Ural State Mining University (Ekaterinburg, Russia):

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

EVRAZ KGOK (Kachkanar, Russia):
Sytykh N. A., Head of Quality Control Department

The processing technology for magnetite-containing ores involving increased magnetic field induction separators in the first stage of wet magnetic separation (WMS) is considered. The results of laboratory tests are shown, confirming the possibility of increasing the concentrate yield and iron recovery into the concentrate when the magnetic field of the separator is increased by induction from 0.12 to 0.25 T. The magnetic forces acting on particles in industrial separators with magnetic field induction of 0.16 and 0.25 T are calculated. The theoretical calculations demonstrate that an increase in magnetic field induction allows particles with lower magnetic susceptibility to be recovered into the magnetic product. This should lead to lower iron losses with the tails of the first WMS stage. The results of fullscale tests of the circuit using increased magnetic field induction separators at the first stage of wet magnetic separation are presented. With an increase in induction from 0.16 to 0.2–0.25 T, the concentrate yield grew by 0.35 % and iron recovery into the concentrate improved by 0.75 %. The mass fractions of Fe and Femagn in the total tailings decreased from 5.87 to 5.76 % and from 0.53 to 0.42 %, respectively. The mass fraction of iron in the concentrate decreased from 61.2 to 60.7 %, which is associated with the lower mass fraction of class –0.071 mm in the concentrate, dropping from 81.1 to 76.5 %. The increase in the concentrate particle size was due to the higher amounts of the magnetic product obtained when using increased magnetic field induction separators. This led to higher loads at the subsequent grinding stage. The final conclusion on the applicability of the technology considered shall be made based on the respective trade-off study of the available options.

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