地浸终采残留液对某砂岩型铀矿的浸出性能研究

为推动终场采场残留液在地浸采铀中的利用,通过室内静态试验,研究了酸法地浸终采残留液对砂岩铀矿含矿岩芯的浸出条件和浸出动力学。试验结果表明:1)该砂岩岩芯适合酸法浸出;2)残留液对该矿在自然粒径下的最佳浸出条件:固液质量体积比为1∶8 g/mL,浸出时间为48 h,双氧水加入质量浓度为1 g/L,铀浸出率为77.36%。残留液的铀浸出动力学研究(反应活化能Ea=27.519 kJ/mol)结果表明,残留液对该铀矿的浸出过程主要受混合控制。该研究可为终场残留液在地浸采铀中的应用提供参考。

Study on Leaching Performance by In-situ Residual Solution for a Sandstone Type Uranium Deposit

In order to promote the utilization of the residual solution in the final stope for in-situ leaching of uranium, the leaching performance of the residual solution for a sandstone uranium ore was studied. Based on the laboratory static test, the leaching conditions and kinetics of the residual solution from the acid in-situ leaching final stope to anore bearing core were studied. The results show:1)the sandstone ore issuitable for acid leaching;2)the best leaching conditions of the residual solution for the ore under the natural particle size are as the follows: the mass volume ratio of solid to liquid is 1∶8 g/mL, the leaching time is 48 h, the mass concentration of hydrogen peroxide added is 1 g/L, and the uranium leaching rate is 77.36%. The uranium leaching kinetics and reaction activation energy(reaction activation energy Ea=27.519 kJ/mol) indicated that the process of leaching uranium by residual liquid was mainly controlled by mixing. This study can provide a theoretical reference for the application of the final field residual liquid in in-situ leaching of uranium.