Experimental Study on Beneficiation Process Optimization and Comprehensive Recovery of Iron from Tailings of a Low grade Copper-gold Ore in Mongolia
A low grade copper-gold ore in Mongolia contains 0.20 g/t gold,0.24％copper,1.80％sulfur and 1.7％magnetic iron.Copper minerals are mainly the chalcopyrite mineral,a small amount of Bornite and copper blue;The other sulfides are mainly pyrite;Magnetic minerals are mainly magnetite and hematite,which can be recovered comprehensively.Based on the ore properties of low content of target minerals and fine distribution size,the flotation-magnetic process of"Cu-S bulk flotation-mixed concentrate regrinding-Cu-S separation-comprehensive recovery of Fe from bulk flotation tailings"was recommended,and the closed-circuit flotation test obtained a copper-gold bulk concentrate containing 20.30％copper and 11.44 g/t gold,with recoveries of 86.00％copper and 69.40％gold.A final iron concentrate containing 65.34％iron was then obtained by the flotation-magnetic process,with recoveries of 23.80％iron and 91.70％magnetic iron.Compared with the original process,iron resource in flotation tailings can be comprehensively recovered while copper and gold concentrate grade were significantly improved.
low gradeCu-Au OreCu-S separationcomprehensive recovery of ironmagnetic separation
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