从高锡高砷铜阳极泥中浸出铜镍的工艺研究

采用硝酸氧化酸性浸出法从高锡高砷铜阳极泥中浸出铜镍,主要考察了硝酸添加量、反应温度、硫酸浓度、固液比和反应时间等因素对铜镍浸出效果的影响。实验结果表明,在铜阳极泥质量20.0 g、2.0 mol/L硫酸溶液100 mL、固液比1/5、浸出温度85℃、浓硝酸用量2.0 mL、搅拌速度500 r/min和浸出时间90 min时,Cu和Ni平均浸出率分别达到94.58%和80.22%,而As、Sb和Sn浸出率仅为4.52%,1.11%和0.15%,实现了Cu、Ni从阳极泥中的有效分离。

Preparation of high pure tellurium from raw tellurium containing Cu and Se by chemical method

High pure tellurium was prepared from raw tellurium containing copper and selenium by chemical method containing oxidation with concentrated nitric acid, leaching with hydrochloric acid, reducing with sulfur dioxide and treating in hydrogen atmosphere at high temperature. Removal ratio of Cu in raw tellurium reaches 99% after raw tellurium is oxidized and leached with HNO3（69%） under the following conditions： 0.96 times stoichiometric quantity of concentrated nitric acid, 4：1 of ratio of liquid to solid, 20 °C of reaction temperature and 30 min of reaction time. Leaching ratio of Te reaches 99% after Te is leached with hydrochloric acid under the following conditions： 1.67 times stoichiometric quantity of hydrochloric acid, 4：1 of ratio of liquid to solid, 20 °C of reaction temperature and 30 min of reaction time. Tellurium powder（99.95%） is obtained when Te（IV） in leachate is reduced with sulfur dioxide. The purity of tellurium increases from 99.954% to 99.999 6% after tellurium（99.95%） is treated in hydrogen atmosphere at 723.15 K for 30 min.