新疆某铀矿床碱法浸出元素迁移探究

Study on Element Migration of Alkali Leaching in a Uranium Deposit in Xinjiang

为探索新疆某可地浸砂岩型铀矿床开采工艺参数和浸出过程中的元素迁移规律,在室内开展不同HCO3-浓度梯度(0.6、1、3、5、7g/L)的碱法摇瓶试验,同时对比是否添加氧化剂对浸出的影响。结果表明:碱法浸出铀浓度与加入HCO3-浓度正相关,且添加氧化剂时,浸出效果明显更优。HCO3-浓度在0.6~1g/L时,铀浸出效果不明显,HCO3-浓度增加到3g/L时,铀浓度出现增长突变,继续增大HCO3-浓度时,铀浓度虽呈增长趋势,但增长幅度较小。综合考虑效益、成本等因素,最佳HCO3-浓度为3g/L,且添加氧化剂更有利于浸出。

In order to explore mining technological parameters of a in-situ leachable sandstone-type uranium deposit in Xinjiang and element migration law during leaching,alkaline flask tests with different HCO3-concentration gradients(0.6,1,3,5 and 7 g/L)were carried out in laboratory,and influence of oxidizing agent on leaching was compared.The results show that uranium concentration in alkaline leaching is positively correlated with HCO3-concentration,and leaching effect is obviously better when oxidant is added.When HCO3-concentration is 0.6—1 g/L,uranium leaching effect is poor,but uranium concentration shows a sudden increase when HCO3-concentration rises to 3 g/L.However,when HCO3-concentration continues to rise,uranium concentration rises with a small growth.Considering the benefit,cost and other factors,it is concluded that the optimal concentration of HCO3-is 3 g/L and adding oxidant is more beneficial to leaching.