二氧化碲制备碲粉新工艺生产实践  

Production practice of a new process for preparing tellurium powder from tellurium dioxide

作　　者：董竞成 李玉东 叶钟林 章尚发 王鹏程 李鑫 朱思毅 徐勇 DONG Jingcheng;LI Yudong;YE Zhonglin;ZHANG Shangfa;WANG Pengcheng;LI Xin;ZHU Siyi;XU Yong(Southwest Copper Branch,Yunnan Copper Co.Ltd.,Kunming 650102,China;Yimen Copper Co.Ltd.,Yuxi 651100,China;China Copper Co.Ltd.,Kunming 6500051,China)

机构地区：[1]云南铜业股份有限公司西南铜业分公司,云南昆明650102 [2]易门铜业有限公司,云南玉溪651100 [3]中国铜业有限公司,云南昆明650051

出　　处：《中国有色冶金》2023年第6期60-66,共7页China Nonferrous Metallurgy

摘　　要：二氧化碲盐酸浸出-二氧化硫还原是生产碲的新工艺,该工艺流程短、设备配置简单、回收率高,具有较好的应用前景。本文考察该工艺中浸出温度、浸出时间、浸出液固比、预还原时间、还原时间、还原温度等参数对碲回收率的影响,并创新性地提出铁粉深度还原降低后液含碲措施,以提升碲还原率及回收率。主要得到以下结论:在浸出温度65℃、浸出时间60 min、浸出液固比3:1、预还原时间5 min、还原时间6 h、还原温度70℃的条件下,碲的浸出率为95.5%,还原率为91.5%,碲粉经洗涤浇铸后可获得满足Te9995牌号标准的精碲。通过铁粉深度还原含碲后液,可将碲的还原率进一步提升至96%,流程碲回收率达91.68%。相比于电积工艺,新工艺可缩短生产周期95%,实现了碲产品高效产出与经济效益提升。HCl leaching-SO_(2)reduction is a new process for the production of tellurium.Because of the short process,the simple equipment configuration,the high recovery rate,it has a good application prospect.In this paper,the effects of leaching temperature,leaching time,leaching liquid-solid ratio,pre-reduction time,reduction time,reduction temperature and other parameters on tellurium recovery rate were investigated.In order to improve the tellurium reduction rate and recovery rate,the measures of deep reduction of by iron powder were innovatively proposed.The main conclusions are as follows,under the conditions of leaching temperature 65℃,leaching time 60 min,leaching liquid-solid ratio 3:1,pre-reduction time 5 min,reduction time 6 h and reduction temperature 70℃,the leaching rate of tellurium is 95.5%,and the reduction rate is 91.5%.After washing and casting,the tellurium powder can be obtained to meet the Te9995 standard.The reduction rate of tellurium can be further increased to 96%by deep reduction of tellurium-containing solution with iron powder,and the recovery rate of tellurium in the process is 91.68%.Compared with the electrowinning process,the new process can shorten the production cycle by 95%,and realize the efficient output of tellurium products and the improvement of economic benefits.

关 键 词：二氧化碲 盐酸浸出 二氧化硫还原 预还原 铁粉深度还原 电积工艺 高纯碲粉 高效冶金 

分 类 号：TF84[冶金工程—有色金属冶金]