两段酸浸法浸出铜烟尘中的铜锌铟

Extraction of Copper, Zinc and Indium from Copper Dust with a Two-Stage Acid Leach Technique

以某铜烟尘为处理对象,采用常压酸浸回收铜锌、氧压酸浸回收铟的两段酸浸法浸出其中的铜、锌、铟。常压酸浸法浸出铜烟尘中锌和铜的最佳条件为:浸出温度95℃,硫酸浓度180 g/L,搅拌速率350 r/min,液固比4∶1,浸出时间120 min,此时铜、锌、铟浸出率分别为84.25%、95.35%和9.98%。采用氧压酸浸法浸出铜烟尘中的铟,最佳条件为:浸出温度220℃,搅拌速率650 r/min,釜内氧分压0.60 MPa,液固比4∶1,硫酸浓度180 g/L,浸出时间150 min,此时铜、锌、铟浸出率分别为93.12%、97.89%和99.50%。

A two-step acid leaching technique was employed for treatment of a kind of copper dust for recovering copper,zinc and indium therein.In an experimental study,the first stage of atmospheric pressure acid leaching for recovering copper and zinc was performed under the optimal conditions including leaching temperature of 95℃,sulfuric acid concentration of 180 g/L,agitation speed of 350 r/min,liquid-solid ratio of 4∶1 and leaching time of 120 min,resulting in the leaching rates of Cu,Zn and In at 84.25%,95.35%and 9.98%respectively;the second stage of oxygen pressure acid leaching for recovering indium was performed with the optimal conditions including leaching temperature of 220℃,agitation speed of 650 r/min,partial oxygen pressure of 0.60 MPa,liquid-solid ratio of 4∶1,sulfuric acid concentration of 180 g/L and leaching time of 150 min,with the leaching rates of Cu,Zn and In at 93.12%,97.89%and 99.50%,respectively.