Na2SO3浸出法提纯粗硒工艺研究

Study on Crude Selenium Purifying by a Sulfite Sodium Leaching Method

摘要:

采用Na2SO3浸出法提纯粗硒，研究浸硒过程Na2SO3溶液浓度、浸出温度、浸出时间、搅拌速度和净化过程Na2S溶液浓度对提纯粗硒的影响，采用XRD、SEM对所得样品进行表征。结果表明，Na2SO3溶液浓度为300 g/L、浸出温度为98 ℃、浸出时间为2 h、搅拌速度为150 r/min、Na2S溶液浓度为2 g/L时，粗硒的提纯效果最佳，硒的浸出率达98.6%，精硒纯度达99.98 %。XRD分析结果表明，所得样品的纯度得到了进一步的提高。SEM分析表明，所得精硒颗粒呈纺锤状、粒度分布均匀

Abstract:

A sodium sulfite leaching method was adopted to purify selenium. Effects of concentration of sodium sulfite solution, leaching temperature, leaching time, stirring speed in selenium leaching process and concentration of sodium sulfide solution in the purification process on selenium purification were studied. The sample was analyzed by XRD and SEM. The results show that under the conditions of sodium sulfite solution of 300g/L, leaching temperature of 98 oC, leaching time of 2 h, stirring speed of 150 r/min and sodium sulfide solution of 2 g/L, the integrated effect of selenium purification is best. The leaching rate of selenium is 98.6% and the purity of fine selenium is 99.98%. XRD analysis shows that the purity of the sample is further improved. SEM analysis shows that the as-prepared selenium powders are shuttle-like and in homogeneous distribution.