Ural State Mining University (Ekaterinburg, Russia):

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

Iron ore processing is sensitive to the magnetic properties of magnetite and titanomagnetite. When the magnetic hardness of magnetite is high, respective demagnetizing operations are added to the process to break the magnetite floccules. Preliminary demagnetization of the hydrocyclone feed in the beneficiation of titanomagnetite ore allowed improving the classification efficiency by 22.6 %. Demagnetization of the screw separator feed resulted in an increase in the mass fraction of iron in the magnetite concentrate recovered upstream of the last grinding stage from 58 to 63 %. Preliminary slurry demagnetization positively affects the hydraulic screening process. At high slurry dilution, when the solids mass fraction is 20 %, the screening performance may be improved without preliminary demagnetization. Demagnetization upstream of filtration can reduce the moisture content of the concentrate by 0.4 to 0.5 %. The effectiveness of preliminary demagnetization depends on the coercive force of the magnetite from a particular deposit. Wet magnetic separation in an alternating field can significantly inhibit magnetite flocculation as compared to separation in a constant magnetic field. During additional processing of magnetite concentrate in an alternating magnetic field, the mass fraction of iron in the concentrate grew significantly from 62.32 to 66.44 %. This allows considering separation in an alternating magnetic field as a method for improving the iron concentrate grade.

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