Magnitogorsk State Technical University, Magnitogorsk, Russia:

V. B. Chizhevsky, Professor, Doctor of Engineering Sciences
V. N. Petukhov, Professor, Doctor of Engineering Sciences
N. V. Fadeeva, Associate Professor, Candidate of Engineering Sciences, natali_fadeeva@mail.ru
N. V. Gmyzina, Associate Professor, Candidate of Engineering Sciences

The influence of the conditions of ore pretreatment before grinding on the selectivity of mineral dissociation and separation is estimated. The possibility of intensifying grinding, reducing energy consumption and increasing efficiency of magnetite ore processing due to better dissociation of minerals after magnetoimpulse treatment is shown. The material constitution of magnetite ores from the Maly Kuibas and Techenskoe deposits is studied. The ores are finely disseminated; the size of the magnetite grains reaches a few microns. The microscopic research was carried out on the SIA Mineral C7 installation Photolab. Magnetoimpulse treatment of ores implemented on the installation capable to create the magnetic field strength up to 3.55×102 kA/m and to change parameters of processing cycles. Subsequent grinding was executed on a 1.2 dm³ batch mill with determination of the granulometric composition of the ground products on a mechanical shaker. Wet magnetic separation was performed on electromagnetic tube analyzer 298 SE-00.000PS. The effect of the magnetic field strength, duration of magnetic pulse treatment and the presence of balls, as well as the electric power consumption as per the granulometric composition of the ground ores was studied. The optimum intensity is 1.28×102 kA/m, and the optimum pulse duration is 1 s. The presence of balls during magnetoimpulse treatment intensifies the process of grinding: the size -0.071 mm in the ground ores increases from 47.82 and 44.52% to 61.33 and 54.89% at the simultaneous reduction in the grinding time. The wet magnetic separation of ore ground after МРР increases the mass fraction of iron in the magnetic product from 60.89 and 58.61% to 62.09 and 59.61% at the rise I recovery from 70.36 and 66.56% to 74.32 and 69.28%, which is due to the better dissociation of intergrown minerals.

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