关键词: 铜冶炼渣, 直接还原焙烧, 磁选, 综合回收

Abstract: Copper smelting slag contains valuable metals such as copper and iron. Copper metal could be recovered directly by flotation， but iron minerals are difficult to separate directly by magnetic separation due to complex minerals composition. In this paper， copper smelting slag containing 38.76% iron and 2.26% copper was taken as the research object. Based on the analysis of ore properties， copper and iron were recovered from the copper slag by direct reduction roasting and magnetic separation process when bituminous coal was used as the reducing agent. The results showed that the copper smelting slag， bituminous coal and CaO were mixed at a mass ratio of 100∶25∶20， and then roasted in 1 200 ℃ for 80 minutes. The roasted samples were ground to -0.045 mm accounted for 80%， and then subjected to magnetic separation at magnetic field intensity of 111 kA/m. Finally， concentrates with 91.54% iron-containing and 6.06% copper-containing was obtained. The corresponding recovery rates were 90.54% of copper and 89.04% of iron， respectively， which provides basis for the production and utilization of the copper smelting slag.

Key words: copper smelting slag, direct reduction roasting, magnetic separation, comprehensive recovery