3,5-二硝基水杨酸改性硅胶脱除稀土料液中的铝  

Removal aluminum from RE leaching solution using 3,5-dinitrosalicylic acid modified silica gel

作　　者：杨洋 李金辉 高岩 徐志峰 王瑞祥 YANG Yang;LI Jin-hui;GAO Yan;XU Zhi-feng;WANG Rui-xiang(School of Metallurgy and Chemical Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China;Henan Institute of Metallurgy Co.,Ltd.,Zhengzhou 450053,China)

机构地区：[1]江西理工大学冶金与化学工程学院,赣州341000 [2]河南省冶金研究所有限责任公司,郑州450053

出　　处：《中国有色金属学报》2020年第2期447-455,共9页The Chinese Journal of Nonferrous Metals

基　　金：江西省教育厅项目(GJJ160593);江西省科技厅项目(20161ACG70010);江西省博士后基金资助项目(2017KY17)。

摘　　要：针对离子吸附型稀土矿浸出液中铝元素含量高、对稀土后续分离影响大的问题,本研究以3,5-二硝基水杨酸(DNS)作为有机配体,以硅胶作为基体材料,通过化学合成3,5-二硝基水杨酸化学键合硅胶进行吸附除铝研究。结果表明:当3,5-二硝基水杨酸与Al^3+的配位比为1:1、溶液pH=3.5、3,5-二硝基水杨酸改性硅胶用量为2 g时,溶液中Al^3+去除率达90%以上,稀土几乎无损失。采用紫外吸收的方法对机理进行研究,结果显示稀土料液中的Al^3+通过取代3,5-二硝基水杨酸分子中羟基上的H^+与其形成络合物,进而实现稀土与铝的分离。由吸附动力学研究可知,3,5-二硝基水杨酸改性硅胶对Al^3+的吸附符合二级吸附动力学模型,其R^2为0.98813。In view of the high content of aluminum in leaching solution obtained by ion-adsorption rare earth mining and the great influence on the subsequent separation of rare earths,silica gel as the basic material was modified with 3,5-dinitrosalicylic acid(DNS)as the organic ligand through chemical synthesis,which was used for adsorption and aluminum removal from leaching solution of RE.The results show that when the coordination ratio of 3,5-dinitrosalicylic acid to Al^3+is 1:1,the solution pH value is 3.5 and the amount of the modified silica gel with DNS is 2 g,the Al^3+removal rate is over 90%,and the RE loss is 0%nearly.The results of UV spectrum analysis show that Al^3+can form a complex through replacing of H+on the hydroxyl group of the DNS,which achieves the separation of Al^3+and RE^3+.According to the study of adsorption kinetics,the adsorption of aluminum ions by modified silica gel with DNS conforms to the second-order adsorption kinetics model,and its R^2 is 0.98813.

关 键 词：稀土 除铝 3 5-二硝基水杨酸 改性硅胶 选择性配位 

分 类 号：TF821[冶金工程—有色金属冶金]