Ural State Mining University (Ekaterinburg, Russia)
Pelevin A. E., Professor, Doctor of Engineering Sciences, Associate Professor, a-pelevin@yandex.ru

Laboratory studies were conducted to evaluate methods for increasing the yield of dry magnetic separation (DMS) tailings to 30 % for titanomagnetite ore, with the iron content in tailings maintained below 6 %. Experiments were performed using ore feed sizes of P95 = 6, 10, and 30 mm, and both sequential and parallel enrichment schemes for large and small size fractions were tested. Theoretical analysis indicated that reducing the feed size from P95 = 30 mm to P95 = 10 mm allows for a decrease in the magnetic field induction required by the separator, resulting in lower capital and operating costs. Further justification was provided for the superior efficiency of two-drum separators compared to single-drum designs. Reducing the feed size from P95 = 30 mm to P95 = 6 mm increased tailings yield from 25.75 % to 36.75 %, while simultaneously lowering the iron content from 7.68% to 5.73%. However, processing at P95 = 6 mm increases crushing costs, reduces separator throughput, and leads to greater dust generation during dry separation. Implementing DMS with separate enrichment of size classes –12+6 mm and –6+0 mm improves technological performance but requires fine screening and complicates the process flow. Therefore, the recommended approach is DMS at a feed size of P95 = 10 mm using a two-drum separator with different magnetic field inductions for the upper and lower drums.

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