St. Petersburg State Mining University (Russia):

Mezenin A. O., Postgraduate, anton_mezenin@mail.ru

REC «MekhanobrTekhnika» (Russia):

Dmitriev S. V., Leading Engineer, dmitriev_sv@npkmt.spb.ru

St. Petersburg State Mining University (Russia):

Kuskov V. B., Associate Professor, opikvb@mail.ru

Lvov V. V., Associate Professor, opilvv@mail.ru

The article presents the results of finely disseminated hematite ore samples dry processing on electromagnetic separator EVS-15/5. The effects of separator throughput rate, clearance between roll and vibrofeeder chute, magnetic field induction and material size, fed to processing (size fractions –2+0 and –6+2 mm), upon magnetic processing results with feed delivered to processing as pseudo-liquefied layer, are considered. Relationships between separator throughput rate, induction on roll teeth and valuable component recovery are shown graphically. Separators' processing regimes, used in the experiments, are described in detail. It was revealed, that with separator throughput rate increase, magnetic product yield and iron recovery in that product are increased with magnetic product iron content decrease. With clearance between roll and vibrofeeder chute being increased, grade remains approximately on the same level, and magnetic product yield and, consequently, iron recovery in that product, are increased. With magnetic field induction increase, magnetic product yield and iron recovery in that product are increased with iron content decrease. It was established, that the obtained results prove the significant advantage of finely disseminated weakly-magnetic ferrous ores separation in pseudo-liquefied layer in comparison with stable transport of –2+0 mm particles. With particles size of –6+2 mm, a certain decrease in processing results is observed. Application of vibratory pseudo-liquefaction effect permits to significantly increase dry magnetic processing results owing to overcoming of adhesive force, permitting to recover paramagnetic particles from material layer depth, and not only from material layer surface.

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