Novel process for selectively separating and recovering tellurium from tellurium slag

被引：0
|
作者：
Guo X.-Y. [1 ,2 ,3 ]
Xu Z.-P. [1 ,2 ,3 ]
Li D. [1 ,2 ,3 ]
Tian Q.-H. [1 ,2 ,3 ]
Zhang Z. [1 ,2 ,3 ]
机构：
[1] School of Metallurgy and Environment, Central South University, Changsha
[2] Hunan Key Laboratory of Nonferrous Metal Resources Recycling, Changsha
[3] Hunan Engineering Research Center of Nonferrous Metal Resources Recycling, Changsha
来源：
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2018年 / 28卷 / 05期
基金：
中国国家自然科学基金;
关键词：
Leaching efficiency; Novel process; Recovery; Separation; Tellurium slag;
D O I：
10.19476/j.ysxb.1004.0609.2018.05.17
中图分类号：
学科分类号：
摘要：
A novel process, including sodium sulfide leaching and sodium sulfite reduction, was proposed to selectively separate and recover tellurium from tellurium slag, which came from basic refining of bismuth crude. The effects of Na2S concentration, leaching temperature and time, liquid to solid ratio on leaching efficiency of tellurium, and Na2SO3 multiple of stoichiometric, reacting temperature and time on reduction efficiency of tellurium were investigated. The results show that the leaching efficiency of tellurium reaches 87.77% under the conditions of Na2S concentration 40 g/L, leaching temperature 50 ℃, leaching time 1 h, L/S 8, and the reduction efficiency of tellurium reaches 98.51% under the conditions of Na2SO3 multiple of stoichiometric 2.0, reacting temperature 30 ℃, reacting time 30 min. The content of tellurium in the reduction product reaches 97.34%, and the XRD results show that reduction product is a single Te element phase. Tellurium can be effectively extracted and recovered from tellurium slag by sodium sulfide leaching and sodium sulfite reduction. The process is simple, clean and low cost, which is promising for industrialization in the future. © 2018, Science Press. All right reserved.
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页码：1008 / 1015
页数：7
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