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酸法浸铀过程中浸出液铀浓度及化学成分通常会随时间发生改变，同时伴随有黏土矿物的产生。以内蒙古芒来铀矿石为研究对象，开展了4种酸度(5、10、15、20 g/L H_2SO4)条件下室内酸法浸泡浸铀试验，对试验过程中浸出液化学成分及铀浸出特征与矿物的黏土化蚀变特征进行了系统探讨。研究结果表明，铀浸出过程中六价铀浸出迅速而四价铀浸出较慢，铀渣计浸出率为83.73%～88.07%;矿石中的含铀、含钠、含钾、含钙、含铁、含铝等矿物发生溶解，使溶浸液中的U6+、U4+、Na+、K+、Ca2+、Al3+、Fe2+、Fe3+浓度大幅增高；矿石中的长石类矿物发生了明显的黏土化蚀变，黏土矿物以伊利石为主。这些研究成果可以为该铀矿的开发工艺技术的确定和预防含矿层堵塞提供技术支撑。
Abstract：During acid leaching of uranium, the chemical composition of leachate usually changes significantly, along with the production of clay minerals.Taking the Inner Mongolia Manglai uranium ore as the research object, the indoor acid immersion uranium test under four acidity(5,10,15,20 g/L H_2SO4)conditions was carried out, and the changes of U6+,U4+,Na+,K+,Ca2+,Mg2+ and Al3+ in the leachate during the test were analyzed, and the clayification alteration characteristics of minerals and characteristics of uranium leaching during the test process were systematically discussed.The results show that the leaching rate of uranium in slag is 83.73%-88.07%,while the leaching rate of uranium(Ⅵ)is fast and that of uranium(Ⅳ)is slow.The minerals containing uranium, sodium, potassium, calcium, iron and aluminum in the ore dissolve, making the concentration of U6+,U4+,Na+,K+,Ca2+,Al3+,Fe2+ and Fe3+ in the leaching solution increase significantly.Feldspar minerals in the ore have obvious clay alteration and illite is the main clay minerals.These research results can provide technical support for determining the development technology of Manglai uranium deposit and preventing the blockage of ore-bearing strata.
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基本信息:
中图分类号:TL212.12
引用信息:
[1]吴怡娴,刘金辉,阳奕汉,等.芒来铀矿石酸法铀浸出与矿物黏土化特征[J].有色金属(冶炼部分),2023(10):87-95.
基金信息:
国家自然科学基金核技术创新联合基金项目(U1967209); 中国铀业有限公司—东华理工大学核资源与环境国家重点实验室联合创新基金项目(NRE2021-17)
2023-09-20
2023-09-20