Experimental Validation of Influence Exerted by Characteristics of Dry Magnetic Separation Feed on the Process Efficiency
D. N. Shibaeva1, D. A. Asanovich1, A. A. Kompanchenko2
1Mining Institute, Kola Science Center, Russian Academy of Sciences, Apatity, Russia
2Geological Institute, Kola Science Center, Russian Academy of Sciences, Apatity, Russia
Keywords: Iron ore, dry magnetic separation, separation efficiency, total iron content, size grade, size modulus, enrichment factor
Abstract
The influence of changeability of dry magnetic separation feed characteristics on the separation process efficiency is considered at the fixed operation modes of equipment is examined as a case-study of the Olenegorsk deposit ore. It is found that the major effect is exerted by the content of total iron: its increase in the feed is independent of the maximum linear size in the size grade and of the size modulus, and is accompanied with Fetot content growth in the magnetic fraction. The results of dry magnetic separation of a narrow particle size range prove that for - 80 + 2 mm, the correlation of Fetot content of the magnetic fraction (at В = 0.16 T) has a high approximation coefficient of 0.9461, which is reflective of a weak contribution of the feed size to separation efficiency. Regarding influence exerted on separation performance by the size modulus, it is found that the absence of ore pretreatment by sifting ensures reduction in loss of Fetot with the nonmagnetic fraction in 70% of cases.
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