摘要
独居石是典型伴生铀、钍的稀土矿资源,通过现有的碱溶转化、优溶等步骤提取稀土后,所得优溶渣是富含铀、钍、稀土的重要二次资源。为与稀土提取保持一致的盐酸体系,研究优溶渣的盐酸浸出过程对整体回收工艺十分关键。采取单因素试验考察浸出过程条件对铀、钍、稀土浸出率的影响。结果表明,使用下述优化参数:盐酸浓度6 mol/L、浸出时间1.5~2 h、浸出温度60℃、液固体积质量比3 mL/g时,优溶渣中铀、钍、稀土的浸出率分别可达90%~95%、92%~93%、>60%,实现了较高的资源回收率。浸出渣的工艺矿物学分析表明,其主要由锆石、钍化合物和石英等脉石矿物组成。剩余的稀土组分则主要集中在未分解的独居石中,其余为少量磷钇矿和褐钇铌矿。试验结果可为独居石优溶渣的综合回收技术提供基础数据和支撑。
Monazite is a typical rare earth mineral resource associated with uranium and thorium.After extracting rare earth elements through existing steps such as alkaline dissolution transformation and acid preferential dissolution,the generated preferential dissolved residue is an important secondary resource rich in uranium,thorium,and rare earth.To maintain a consistent hydrochloric acid system with rare earth extraction,it is significant to study hydrochloric acid leaching process of preferential dissolved residue for the overall recovery process.A single factor experiment was conducted to investigate the effect of leaching process conditions on leaching rate of uranium,thorium,and rare earth.The results show that leaching rate of uranium,thorium and rare earth in preferential dissolved residue can reach 90%-95%,92%-93% and>60%,respectively under the optimization parameters including hydrochloric acid concentration of 6 mol/L,leaching time of 1.5-2 h,leaching temperature of 60℃,and L/S of 3 mL/g,which high resource recovery rate is achieved.The process mineralogical analysis of the leaching residue shows that it is mainly composed of gangue minerals such as zircon,thorium compounds and quartz.The remaining rare earth components are mainly concentrated in the undissolved monazite,and the rest part is a small amount of xenotime and fergusonite.The experimental results can provide basic data and useful support for the comprehensive recovery technology of monazite preferential dissolved residue.
作者
刘康
苏学斌
梁耕宇
程浩
王桂硕
张承天
刘忠臣
刘会武
向秋林
LIU Kang;SU Xuebin;LIANG Gengyu;CHENG Hao;WANG Guishuo;ZHANG Chengtian;LIU Zhongchen;LIU Huiwu;XIANG Qiulin(Beijing Research Institute of Chemical Engineering and Metallurgy,CNNC,Beijing 101149,China;China National Uranium Co.,Ltd.,Beijing 100013,China)
出处
《有色金属（冶炼部分）》
CAS
北大核心
2024年第2期99-106,共8页
Nonferrous Metals（Extractive Metallurgy)
基金
国家重点研发计划项目(2019YFC1907702)
中国核工业集团有限公司集中研发项目(中核科发[2021]-144号)
中国核工业集团有限公司领创基础研究项目(中核科发[2022]-440号)。
关键词
独居石
优溶渣
盐酸浸出
铀
钍
稀土
monazite
preferential dissolved residue
hydrochloric acid leaching
uranium
thorium
rare earth
