盐酸浸出氧化铝赤泥回收镓

研究了拜耳法赤泥盐酸浸出镓的过程。采用正交试验考察浸出温度、时间、液固比和酸度对镓浸出率的影响。结果表明,在最佳浸出条件下:8mol/L盐酸、液固比4.0、109℃浸出5h,镓浸出率达到95.4%。用50%TBP+50%煤油一次萃取,镓萃取率达到98%。用0.5%食盐水反萃,镓反萃率为96.8%。反萃液用0.5mol/L NaOH溶液中和、过滤、烘干后,固体中镓的质量百分数为4.32%,从赤泥中富集了136倍。镓的总回收率达到85%以上。

Gallium Recovery from Alumina Red Mud with Hydrochloric Acid Leaching

The hydrochloric acid leaching process of gallium from Bayer red mud was studied.The effects of leaching temperature,time,ratio of liquid to solid(L/S) and concentration of hydrochloric acid on the leaching rate of gallium were investigated with orthogonal test.The results show that the leaching rate of gallium is 95.4% under the optimum conditions including hydrochloric acid concentration of 8 mol/L,L/S=4.0,5 hours leaching at 109 ℃.The extraction rate of gallium reaches 98% with 50% TBP+50% kerosene,the stripping rate of gallium is 96.8% with 0.5% salt solution.The stripping solution is neutralized with 0.5mol/L NaOH solution and then filtrated and dried.The gallium mass percentage is 4.32% in solid and is enriched 136-fold from the red mud.The total gallium recovery is above 85%.