Recovery of copper and cobalt from ancient slag

摘要

About 2.5 million tonnes of copper smelter slag are availabL in Kure, northern part of Turkey. This slag contains large amounts of metallic values such as copper and cobalt. A representative slag sample containing 0.98 percent Cu, 0.49 percent Co am 51.47 percent Fe was used in the experimental studies. Two different methods, direct acid leaching and acid baking followed by hot water leaching were used for recovering Cu and G from the slag. The effects of leaching time, temperature an< acid concentration on Cu- and Co-dissolving efficiencies were investigated in the direct acid leaching tests. The optimum leaching conditions were found to be a leaching time of 2 h acid concentration of 120 g L~(-1) and temperature of 60 deg C Under these conditions, 78 percent Cu and 90 percent Co were extracted In the acid baking + hot water leaching tests, 74 percent Co was dissolved after 1 h of roasting at 200 deg C using a 3 : 1 acid : slag ratio, whereas the Cu-dissolving efficiency was 79 percent and the total slag weight loss was approximately 50 percent.