Desorption of REEs from Halloysite and Illite: A Link to the Exploitation of Ion-Adsorption RE Ore Based on Clay Species

被引：9

作者：

Qiu, Sen ^{[1
,2
]}

Yan, Huashan ^{[1
,2
]}

Hong, Bengen ^{[3
]}

Long, Qibang ^{[2
]}

Xiao, Jie ^{[2
]}

Li, Fujian ^{[1
,4
]}

Tong, Lichao ^{[3
]}

Zhou, Xiaowen ^{[1
,2
]}

Qiu, Tingsheng ^{[1
,2
]}

机构：

[1] Jiangxi Univ Sci & Technol, Collaborat Innovat Ctr Dev & Utilizat Rare Met Re, Minist Educ & Jiangxi Prov, Ganzhou 341000, Peoples R China

[2] Jiangxi Univ Sci & Technol, Coll Resource & Environm Engn, Ganzhou 341000, Peoples R China

[3] Longyan Rare Earth Dev Co Ltd, Longyan 361000, Peoples R China

[4] Chinese Acad Sci, Inst Proc Engn, Beijing Key Lab Ion Liquids Clean Proc, CAS Key Lab Green Proc & Engn,State Key Lab Multi, Beijing 100045, Peoples R China

来源：

MINERALS | 2022年 / 12卷 / 08期

基金：

中国国家自然科学基金;

关键词：

rare earth; clays; adsorption; desorption; electrostatic attraction; RARE-EARTH-ELEMENTS; KAOLINITE; REDISTRIBUTION; FRACTIONATION; MINERALS; STATE;

D O I：

10.3390/min12081003

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

The adsorption/desorption characteristics for light and heavy rare earth elements (REEs) on halloysite and illite (which are beneficial for the utilization of ion-adsorption RE ore) were systematically investigated and compared. Additionally, halloysite and illite were fully charactered by XRD, SEM, microscope, zeta potential, nitrogen adsorption-desorption isotherms and buffer pH to build the relationship between adsorption/desorption mechanisms and the minerals' properties. The results of experiments show that the adsorption rate of halloysite is higher than illite, although they are both very fast and follow the pseudo-second-order kinetic model. The adsorption capacity of halloysite and illite increases with an increase in adsorption pH and remains constant when pH is higher than 4. Due to the narrow interlamellar spacing of halloysite and the fact that it is a nanotube, RE ions are adsorbed only through electrostatic attraction, whereas the adsorption and desorption pH have a significant effect on the recovery of RE ions from illite, because of the diverse adsorption mechanism. The results illustrated that the structure and surface properties of clays are also the key factors that affect RE ions leaching.

引用

页数：14

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