Removal of Arsenic from Zinc Sulfide Concentrate by an Isodynamic Magnetic Separator

摘要

Zinc sulfide concentrate composed of mainly marmatite, arsenopyrite was subjected to magnetic separation in order to remove arsenic included in the ore. The stage separation was conducted at 2,000 Oe, 5,000 Oe and 10,000 Oe in magnetic field intensity under dry atmospheric condition using an isodynamic separator. Arsenic compounds such as arsenopyrite are concentrated in the non-magnetics. The arsenic grade of the magnetics is decreased with an increase in magnetic field intensity from 0.12 to 0.04 percent. 8.26 percent in the weight of feed sample is recovered as the non-magnetics at 10,000 Oe, and its arsenic grade reaches about 0.96 percent. This implies that around 63 percent of arsenic is able to remove out from the ore. Accordingly, zinc grade and its weight percentage in the magnetics increases with an increase in magnetic field intensity till 48.46 percent and 66.90 percent, respectively, at 10,000 Ge, suggesting that the recovery of zinc in the magnetics attains around 96 percent.