Recovery of Valuable Metals from Copper Smelter Slag by Sulfation Roasting
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In the present paper, recovery of valuable metals from copper smelter slag of Balkhash copper plant (Kazakhstan) was investigated. To recover Fe, Zn and Cu to water-soluble form, the mixture of 150 g of copper slag and 60 g of 85% sulfuric acid was granulated and then roasted in the temperature range of 473–643 K (200–370 °C) followed by sulfuric acid leaching. Once the roasting temperature and duration are, respectively, 643 K (370 °C) and 150 min, the recovery% values of metals to water-soluble form reaches, accordingly: Fe—80.6, Zn—88.7, Cu—81.8. The resulting calcine was subjected to sulfuric acid leaching; after solid: liquid separation, a filtrate was obtained with the following composition, g/L: Fe2+—0.60; Zn2+—3.58; Cu2+—1.03. On adding ammonia water into the filtrate, 98% of iron was selectively precipitated, thereby separating from zinc and copper.
KeywordsCopper smelter slag Leaching Roasting
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