Preparation of pure SbCl3 from
lead anode slime bearing high antimony and low silver
lead anode slime bearing high antimony and low silver
(1. College of Chemical Engineering and Materials, Zhejiang University of Technology, Hangzhou 310014, China;
2. Department of Science and Technology, Guangxi China Tin Group Co., Ltd., Liuzhou 545006, China)
2. Department of Science and Technology, Guangxi China Tin Group Co., Ltd., Liuzhou 545006, China)
Abstract: A novel treatment process of lead anode slime bearing high antimony and low silver was developed by a potential-controlled chloridization leaching and continuous distillation. The experimental results show a high Sb3+concentration, 489.2 g/L, in the leaching solution for two-stage countercurrent leaching process, and the leaching rates of Sb, Cu, Bi more than 99% when the potential is controlled at 450 mV. When the leaching solution is distillated and concentrated at 120 °C, almost all the silicon compound is evaporated into the concentration distillate and exists as amorphous hydrated silica. By the continuous distillation, high pure SbCl3 could be prepared, and AsCl3 is enriched in the distillate while metals Bi, Cu are enriched in the continuous distillation residue. As a result, the recovery rate of Sb is more than 95%.
Key words: lead anode slime; potential-controlled chloridization leaching; continuous distillation; antimony trichloride