This paper proposes an innovative carbothermal reduction roasting low-carbon redox refining process for recovering valuable metals, including copper, zinc, nickel, tin and lead, from electroplating sludge. First, the valuable metals are volatilized into the flue gas by carbothermal reduction roasting. At a reduction temperature of 1473 K, a carbon content of 20%, and a reaction time of 60 min, the ratio of Pb, Sn and Zn removal reached 90.77%, 95.14% and 99.92%, respectively. At an oxidation temperature of 1573 K, a SiO2 content of 6% and a reaction time of 180 min, a water-quenching slag suitable for building materials was obtained by low-carbon oxidation reduction refining. Finally, at a reduction temperature of 1473 K, 8% C addition, and a reaction time of 20 min, copper and nickel were enriched on an anode copper plate and the copper content reached more than 98%, meeting the requirements for copper electrolysis.
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Financial support were provided by the National Nature Science Foundation of China (Nos. 51804136 and 51764016), Jiangxi Province Nature Science Foundation (No. 20181BAB216017), China Postdoctoral Science Foundation (Nos. 2019T120625 and 2019M652276), Key Projects of Jiangxi Key R&D Plan (No. 20192ACB70017), Jiangxi Science and Technology Landing Project (No. KJLD13046), Funded by the Research Fund Program of State Key Laboratory of Rare Metals Separation and Comprehensive Utilization (No. GK-201803).