从低品位铀尾矿中氧化浸出铀
发布时间：2018-11-29 10:11
【摘要】：针对低品位铀尾矿因脉石含量高、物相赋存状态复杂而造成的铀浸出率低的问题,提出添加辅助氧化剂破坏脉石结构而实现强化浸出铀的思路。采用单因素实验法对比常规酸浸和3种氧化剂(H_2O_2、MnO_2和Fe~(3+))强化酸浸对铀浸出率的影响。结果表明:当浸出温度、硫酸浓度和液固比分别为30℃、1 mol/L和20:1时,采用常规酸浸6 h后铀的浸出率仅为78%,而在相同的浸出条件下,强化酸浸1.5 h铀的浸出率可达到95%。浸出渣的XRD及SEM-EDS分析结果表明,H_2O_2及MnO_2均能破坏脉石晶体结构,减少颗粒团聚,但添加MnO_2后生成新的硅酸锰盐晶体,Fe~(3+)不能破坏脉石结构,但其氧化作用在一定程度上能加快铀的浸出。
[Abstract]:Aiming at the problem of low uranium leaching rate caused by high gangue content and complex phase occurrence of low-grade uranium tailings, the idea of strengthening uranium leaching by adding auxiliary oxidant to destroy the structure of gangue is put forward. The effects of conventional acid leaching and three kinds of oxidants (H _ 2O _ 2MnO _ 2 and Fe~ _ (3) on the leaching rate of uranium were compared by single factor experiment. The results show that when the leaching temperature, sulfuric acid concentration and liquid-solid ratio are 30 鈩，
本文编号：2364714
[Abstract]:Aiming at the problem of low uranium leaching rate caused by high gangue content and complex phase occurrence of low-grade uranium tailings, the idea of strengthening uranium leaching by adding auxiliary oxidant to destroy the structure of gangue is put forward. The effects of conventional acid leaching and three kinds of oxidants (H _ 2O _ 2MnO _ 2 and Fe~ _ (3) on the leaching rate of uranium were compared by single factor experiment. The results show that when the leaching temperature, sulfuric acid concentration and liquid-solid ratio are 30 鈩，
本文编号：2364714
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