Effect of magnetic pulse pretreatment on grindability of a magnetite ore and its implication on magnetic separation

Abstract

The pulsed power is a potential means for energy saving and presents an alternative to the conventional mechanical communication for minerals. The effect of magnetic pulse treatment on grindability of a magnetite ore was investigated by grindability tests. The results of the investigation show that the pulsed treatment has little effect on the particle size distribution of the magnetite ore. Significant micro-cracks or fractures are not found by SEM analysis in magnetic pulse treated sample. Magnetic separation of magnetic pulse treated and untreated magnetite ore indicates that iron recovery increases from 81.3% in the untreated sample to 87.7% in the magnetic pulse treated sample, and the corresponding iron grade increases from 42.1% to 44.4%. The results demonstrate that the magnetic pulse treatment does not significantly weaken the mineral grain boundaries or facilitate the liberation of minerals, but is beneficial to magnetic separation.

Keywords

magnetite iron ore / magnetic pulse pretreatment / mineral liberation / magnetic separation

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