摘要
离子吸附型稀土矿浸出工艺中,稀土浸出的同时也会有大量的铝、铁等非稀土杂质随之浸出。选用组氨酸作为络合剂选择性络合铝离子,再加入非离子表面活性剂,利用浊点萃取法萃取分离稀土料液中的铝离子,考察溶液pH、反应温度、萃取平衡时间、组氨酸的用量、组氨酸反应时间及Triton X-114的用量对除铝效果的影响,结果显示M_(组氨酸)∶M_(铝)=3∶1,将溶液pH调至4.5,恒温40℃,反应10 min后加入10 mL Triton X-114,平衡时间10 min,铝离子单次萃取率可达70.85%,稀土萃取率仅为4.45%。确定了组氨酸与铝离子的反应方程式,通过多次萃取研究,组氨酸络合萃取溶液中铝离子的最低萃取浓度c_(Al)=0.0539 g/L±0.003 g/L,分离系数β_((Al/RE))=52.19,说明利用组氨酸作为络合剂与浊点萃取方法相结合时,混合溶液中铝离子能有效与稀土离子分离。
In the ion adsorption type rare earth ore leaching process,the leaching of rare earth is accompanied by the leaching of a large amount of aluminum,iron,and other non-rare earth impurities.Use histidine as a complexing agent to selectively complex aluminum ions,and then non-ionic surfactants are added to extract and separate aluminum ions from the rare earth feed solution using cloud point extraction.The effects of solution pH,reaction temperature,equilibrium time,amount of histidine,reaction time,and amount of Triton X-114 on the effect of aluminum removal are investigated,and the results show that the substance ratio of histidine added to aluminum is 3∶1.The pH of the solution is adjusted to 4.5,the constant temperature is 40℃,and 10 mL Triton X-114 is added after 10 min of reaction.After 10 min of equilibration time,the single extraction rate of aluminum ions could reach 70.85% and the loss rate of rare earth is only 4.45%.The reaction equation of histidine with aluminum ions was determined,and the lowest extraction concentration of aluminum ions in the histidine complex extraction solution,c_(Al)=0.0539 g/L±0.003 g/L,and the separation coefficient,β_((Al/RE))=52.19,were studied by multiple extractions,indicating that the aluminum ions in the mixed solution can be effectively separated from the rare earth ions when using histidine as a complexing agent in combination with the cloud point extraction method.
作者
高亮
李金辉
温耀儒
龙光武
高阳
刘晋彪
王瑞祥
徐志峰
GAO Liang;LI Jin-hui;WEN Yao-ru;LONG Cuang-wu;GAO Yang;LIU Jin-biao;WANG Rui-xiang;XU Zhi-feng(Faculty of Materials Metallurgy and Chemistry,Jiangxi University of Science and Technology,Ganzhou 341000,China;Ganzhou Engineering Technology Research Center of Green Metallurgy and Process Intensification,Ganzhou 341000,China;Key Laboratory of Ionic Rare Earth Resources and Environment,Ministry of Natural Resources,Ganzhou 341000,China;Ganzhou Achteck Tool Technology Co.,Ltd.,Ganzhou 341000,China;Jiangxi College of Applied Technology,Ganzhou 341000,China)
出处
《稀土》
CAS
CSCD
北大核心
2024年第3期19-29,I0003,共12页
Chinese Rare Earths
基金
国家自然科学基金项目(51974140,52064018)
国家重大项目研发计划项目(2019YFC1908404,2019YFC1908405)
江西省科技厅重大项目(20192ACB70017)
江西省离子型稀土资源绿色开发与高值利用国家重点实验室培育计划(20194AFD44003)
江西省高等学校井冈学者特聘教授岗位资助。
关键词
稀土
组氨酸
选择性络合
浊点萃取
除铝
rare earth
histidine
selective complexation
cloud point extraction
aluminum removal
