不同溶浸剂和浸出条件对铀矿废渣中铀浸出的研究

Study on leaching of uranium from waste residue of uranium mine by different leaching agents and leaching conditions

随着我国核电的不断发展,铀矿开采的力度也势必会加大。但由于我国的铀矿资源品位相对较低,所以产生的铀矿废渣的数量也将大幅度增加。本实验为了回收铀矿废渣中的铀资源,研究了溶浸剂浓度和表面活性剂对铀矿废渣中铀浸出率的影响,并考察了不同浸出时间和浸出温度对铀浸出率的影响。其结果表明:当溶浸剂(硫酸)浓度为15%时,铀矿废渣中铀的浸出率可以达到67%左右;在硫酸溶浸剂中添加表面活性剂(MES),可以有效提高低品位铀矿废渣的浸出效率,使得浸出率达到80%以上;且含表面活性剂(MES)的溶浸剂对含铀废渣的最佳浸出温度为30℃;最佳浸出时间为4h。

With the continuous development of nuclear power in China,the intensity of uranium mining will certainly increase.However,due to the relatively low grade of uranium ore resources in China,the amount of uranium ore residue generated will also increase significantly.In order to recover uranium resources in uranium ore residue,the effects of leaching agent concentration and surfactant on uranium leaching rate in uranium ore residue were studied,and the effects of different leaching time and leaching temperature on uranium leaching rate were investigated.The results show that when the concentration of the leaching agent(sulfuric acid)is 15%,the leaching rate of uranium in the uranium ore residue can reach about 67%;adding a surfactant(MES)to the sulfuric acid leaching agent can effectively improve the leaching efficiency and the leaching efficiency of uranium ore residue can reach more than 80%.Moreover the optimal leaching temperature of leaching agent containing MES for uranium-containing waste residue is 30℃;the optimal leaching time is 4h.