Experimental Research on Recovery Copper and Iron from Copper Smelting Slags by Direct Reduction Roasting-magnetic Separation

This is an article in the field of metallurgical engineering. Torecover copper and iron from a copper smelting slag flotation tailingwith iron grade of 37.42% and copper grade of 1.86%, according to the characteristics of its ore properties, the bituminous coal was used as a reductant, the process of direct reduction roasting - magnetic separation was applied.The experimental results show that copper smelting slag, bitumite and quicklime (as a co-reducing agent) are mixed in the mass ratio of 100∶25∶20, and at the conditions of roasting temperature of 1 200 ℃, time of 80 min, the roasted ores gringding fineness of -0.045 mm 80%, and magnetic strength of 0.139 T, the copper-bearing iron ore concentrate can be obtained with an iron grade of 90.98%, iron recovery of 90.13%, copper grade of 5.82% and copper recovery of 87.38%, thus realizing the comprehensive recovery of copper and iron from copper smelting slags.