Author/Authors :
Wu، نويسنده , , Xuelan and Wu، نويسنده , , Shunke and Qin، نويسنده , , Wenqing and Ma، نويسنده , , Xihong and Niu، نويسنده , , Yinjian and Lai، نويسنده , , Shaoshi and Yang، نويسنده , , Congren and Jiao، نويسنده , , Bai-fen and Ren، نويسنده , , Liuyi، نويسنده ,
Abstract :
Zinc residue with high gallium, a waste solid product of hydrometallurgical zinc process is dumped continuously, causing the loss of gallium. Reductive leaching of zinc residue was investigated as a process to recover gallium. It was found to be much more effective using sulfur dioxide as a reductant. The effects of SO2, sulfuric acid concentration, temperature, liquid-to-solid ratio and sulfur dioxide partial pressure were examined to optimize the leaching parameters. In the presence of SO2, the extraction of gallium was maximum of 91% while the extraction of zinc and iron were 90% and 96% under the optimal condition which was determined for 80 g of zinc residue as sulfuric acid concentration of 56 g/L, liquid-to-solid ratio of 7 mL/g, sulfur dioxide partial pressure of 200 kPa, leaching temperature of 100 °C for 120 min.
