低品位铀矿浸出试验研究

Study on Leaching of Low-Grade Uranium Mines

在分析某低品位难处理铀矿工艺矿物学性质的基础上,开展了不同硫酸浓度、铁浓度和温度等因素对铀浸出的影响研究。通过X射线衍射仪和扫描电镜等手段分析铀矿浸出过程中的物相和形貌特征变化,揭示了硫酸和氧化剂Fe^3+对低品位难处理铀矿浸出的作用机理。研究结果表明,该铀矿石在硫酸浓度214.5g/L、Fe^3+浓度11.1g/L的条件下45℃浸出48h,铀浸出率达到98.38%;Fe^3+的增加可破坏脉石结构,且其氧化作用可加快铀的浸出速率。

Based on analysis of mineralogical properties of low-grade refractory uranium ore,effects of concentration of sulfuric acid,iron concentration and temperature on uranium leaching were carried out.Changes of phase and morphology during uranium leaching were analyzed by XRD and SEM.The mechanism of sulfuric acid and oxidant Fe^3+ on leaching of low-grade refractory uranium were revealed.The results show that uranium leaching rate is 98.38% under the conditions including temperature of 45 ℃,leaching time of 48 h,sulfuric acid concentration of 214.5 g/L,and Fe^3+ concentration of 11.1 g/L.Increase of Fe^3+ concentration can destroy gangue structure,and its oxidation reaction can accelerate leaching of uranium.