( 1. 中南大学 冶金科学与工程学院，长沙 410083；
2. 金川集团公司， 金昌 737100；
3. 北京科技大学 冶金生态学院， 北京 100083)
摘 要: 采用SO2作还原剂从含碲的硫酸溶液中制取碲粉， 并确定了SO2从硫酸溶液中还原碲的最佳条件： 反应温度80 ℃， NaCl浓度1.2 mol/L， SO2流量0.1 m3/h， 反应时间40 min， 碲的还原率达到99.63%。 还原所得粗碲粉经亚硫酸钠脱硒， 盐酸酸洗除杂处理， 硒、 砷、 锡、 铜的脱出率分别达到99%、 93%、 80%、 87.5%，得到含碲99.669%的金属碲粉。 XRD和SEM表征表明还原碲粉的形态为针状晶体。
关键字: 碲粉; 二氧化硫; 还原
（ 1. School of Metallurgical Science and Engineering, Central South University, Changsha 410083,China；
2. Jinchuan Group LTD., Jinchang 737100, China;
3. School of Metallurgical and Ecological Engineering,
University of Science and Technology Beijing, Beijing 100083, China）
Abstract: The powders of Te were prapared from sulfuric acid solution bearing Te with SO2 as the reducing agent. The experiments show the optimum process parameters are as follows: reaction temperature 80 ℃, NaCl concentration 1.2 mol/L, SO2 flow rate 0.1 m3/h, reaction time 40 min.Under the optimum condition, 99.63% Te is reduced. After the treatment with NaSO3 and hydrochloric acid, 99% Se, 93% As, 80% Sn and 87.5% Cu are removed from the raw powdered-tellurium, and the powders of 99.669% Te are prepared. The results of XRD and SEM indicate that the powdered-tellurium is crystalline with needle form.
Key words: powdered-tellurium; sulfur dioxide; reduction
