材料科学および工学ジャーナル

Study on Recycling of Galvanic Sludge containing Copper for Pure Copper Production

Abstract

Ma-ud N, Khumkoa S, Buahombura P, Piyawit W, Patcharawit T, Thongnak S and Yingnakorn T

Metal containing waste sludge from electronic industrial has been rapidly accumulating due to the surge of global demands for electronic components. This study looks into the feasibility of recycling copper from galvanic waste through hydrometallurgy combining with electrometallurgy process. The parameters of copper selective leaching including types of leaching solution, acid concentrations, and liquid-solid ratios were systematically studied. The optimum selective leaching conditions were 1 M and 2 M sulfuric acid with 24 h leaching duration, 100/1000 g/cc solid-liquid ratio offering copper leach recovery of 42,540 and 45,850 mg/l, respectively. Copper purification was successfully obtained from electrolytic refining process. The effects of electrolysis voltage to the amount and purity of copper cathode were studied. It was found that the optimum parameters for copper purification were using 2 M sulfuric acid with electrolytic voltage of 2.2 V. Under these conditions, the recovery of pure copper was raised up to 92%.