Sustainable Mining and Metallurgy

The copper content of copper smelting slag in an oxygen-enriched bottom blowing copper smelting slag in Shanxi is 4.19%. In order to better recover the copper metal in the smelting slag, an roughing test was carried out to determine the optimal grinding fineness and reagent system. Under the conditions, a comparative test study of the conventional process and the optimized process was carried out. The experimental results show that the final grinding fineness is -0.045mm accounting for 85%, and the rapid flotation reagent system is Z-200 and butyl xanthate each 200g/t, pine oil 50g/t. The conventional process before optimization is to carry out two-stage flotation after the rapid flotation tailings enter the two-stage grinding, including one roughing, three scavengings, and the scavenging concentrate is returned to the previous operation in sequence. The optimized process flow is that the fast flotation tailings enter the second-stage grinding and then carry out the second-stage flotation, including one roughing, two cleanings and two scavengings, the first tailings and the first scavenging tailings are combined into the middle ore and returned to the middle ore for regrinding, the second cleaning and the second scavenging order are returned to the last operation. Under the condition that the first-stage grinding fineness is -0.074mm accounting for 60% and the second-stage grinding fineness is -0.045mm accounting for 85%, the optimized process can obtain the index of copper concentrate grade of 33.02% and the recovery rate of 94.32%.