从铜阳极泥高压釜浸出液中回收碲和硒的新工艺

A novel process for recovery of Te and Se from copper slimes autoclave leach solution

在铜阳极泥加压氧化浸出过程中,超过65％的碲在脱铜过程中同时析出.在浸出条件恶劣的情况下,大约10％ ～15％的硒也会同时溶解.目前对浸出液的处理方式是让浸出液通过一层铜屑进行循环.浸出液经沉积形成碲化铜和硒化铜,溶液再经过滤进行分离.为了提高反应效率,降低工艺成本,尽量减少铜的加入量,缩短停留时间,降低能耗,在实验室中研究了一种化学还原剂,并进行了沉积工艺试验.本文给出了试验结果,并对工艺化学进行了探讨.

In pressure oxidation leaching of copper anode slimes, more than 65% of the tellurium is co-extracted during decopperizing. About 10% - 15% of the selenium is also dissolved simultaneously by severe leach condi- tions. Current operation for the treatment of the leachate is to constantly recirculate the leach solution through a bed of copper turnings. The tellurium and selenium are precipitated from the leach liquor as copper telluride and copper selenide and separated from the solution by filtration. In order to improve the reaction efficiency and reduce the process cost, viz. minimize the copper addition, cut retention time, and reduce the energy consumption; a chemi- cal reducing agent is studied and the cementation process tested in the laboratory. In this paper, the test results are presented and the process chemistry is discussed.