从含硒酸泥中提取硒的试验研究

Research on Extraction of Selenium From Acid Mud Containing Selenium

研究了采用加钙固硒脱汞—湿法提硒工艺从含硒酸泥中分离硒、汞,考察了焙烧温度、焙烧时间和物料与石灰的质量配比对固硒率的影响,以及硫酸质量浓度、浸出时间对烧渣中硒浸出率的影响,确定了适宜的固硒及浸出参数。试验结果表明:在焙烧温度350～500℃、焙烧时间2h、物料与石灰的质量比100∶40～100∶55条件下,固硒率达99%以上;在硫酸质量浓度500g/L、常温下浸出2h条件下,硒浸出率高达90%以上。

Extraction of selenium from acid mud containing selenium by roasting with calcium to preserve selenium and remove mercury-hydrometallurgical process. The effect of roasting temperature, roasting time,mass ratio between acid reed and lime on selenium preservation rate and sulfuric acid concentration and leaching time on selenium leaching rate from preservation selenium slag were examined. The reasonable parameters and conditions were determined. The results show that the selenium preservation rate is more than 99% in the roasting temperature range of 350-500 ℃ and roasting time of 2 h, the mass ratio between acid mud and lime of （100：40）-（100 ： 55）. The selenium leaching rate is more than 90% under the conditions of sulfuric acid concentration of 500 g/L and leaching time of 2 h.