从铜阳极泥中提取精硒的工艺研究

Process study on extraction of fine selenium from copper anode slime

以国外某铜阳极泥为原料,设计出了一套生产工艺流程,在温度为80~85℃、氢氧化钠浓度为250g/L、固液比为1∶4的条件下进行浸出,母液用1∶1硫酸调节pH值为4~5时沉硒,粗硒通过高温熔炼、氧化除碲得精硒.经过该工艺流程的处理,硒的一次回收率可达88.5%以上,精硒的质量可达99.5%.

A foreign copper anode slime was used as raw material in a production process.For the leaching,the temperature was 80-85 ℃,the sodium hydroxide concentration was 250g/L,and the solid-liquid ratio was 1∶4.Selenium was precipitated,when pH value of mother liquor,mixed with the same amount of sulfuric acid,was 4-5.Fine selenium was obtained from crude selenium through high temperature melting and oxidation removal of tellurium.Such production process made the recovery rate of selenium reach above88.5% at one time and the quality of fine selenium 99.5%.