Preparation of high-purity tellurium powder by hydrometallurgical method
来源期刊：Rare Metals2014年第4期
论文作者：Yuan Liu Ya-Jie Zheng Zhao-Ming Sun
文章页码：479 - 484
摘 要：This hydrometallurgical method consists of oxidation leaching, sulfide impurities removing, and sulfur dioxide reduction. The crude tellurium powder was treated by H2O2 oxidation for 2.0 h at pH 2.5 when adding 50 ml H2O2（30 %） per 100 g raw material, a tellurium recover rate around 91 % is achieved. The tellurium leaching ratio can reach 98.9 % under 3.75 mol L-1NaOH concentration in liquid–solid ratio of 5:1 at 80 °C for 1.5 h. The overall separation of tellurium and other heavy metals is optimum at sulfide dosages of about 1.1 times of the theoretical values. The removal rates of Ag, Ni, Pb, and Cu from the solution are greater than 99.8 %, and As and Se removal rates are 98.6 % and 97.2 %, respectively. Over 99.5 %tellurium can be recovered by SO2 reaction when the operation is conducted at 85 °C in 6 mol L-1HCl solution.The tellurium powder with size of \5 lm and purity of[99.999 % is obtained.
Yuan Liu，Ya-Jie Zheng，Zhao-Ming Sun
School of Metallurgy and Environment,Central South University
摘 要：This hydrometallurgical method consists of oxidation leaching, sulfide impurities removing, and sulfur dioxide reduction. The crude tellurium powder was treated by H2O2 oxidation for 2.0 h at pH 2.5 when adding 50 ml H2O2（30 %） per 100 g raw material, a tellurium recover rate around 91 % is achieved. The tellurium leaching ratio can reach 98.9 % under 3.75 mol L-1NaOH concentration in liquid–solid ratio of 5:1 at 80 °C for 1.5 h. The overall separation of tellurium and other heavy metals is optimum at sulfide dosages of about 1.1 times of the theoretical values. The removal rates of Ag, Ni, Pb, and Cu from the solution are greater than 99.8 %, and As and Se removal rates are 98.6 % and 97.2 %, respectively. Over 99.5 %tellurium can be recovered by SO2 reaction when the operation is conducted at 85 °C in 6 mol L-1HCl solution.The tellurium powder with size of \5 lm and purity of[99.999 % is obtained.
关键词：
