Rare earth ion-adsorption clays in the presence of iron at basic pH: Adsorption mechanism and extraction method

被引：7

作者：

Feng, Xu ^{[1
]}

Onel, Oznur ^{[3
]}

Council-Troche, McAlister ^{[2
]}

MacCormac, Brendan L. ^{[3
]}

Noble, Aaron ^{[3
]}

Yoon, Roe-Hoan ^{[3
]}

Morris, John R. ^{[1
]}

机构：

[1] Virginia Polytech Inst & State Univ, Dept Chem, Blacksburg, VA 24061 USA

[2] Virginia Polytech Inst & State Univ, Virginia Maryland Coll Vet Med, Blacksburg, VA 24061 USA

[3] Virginia Polytech Inst & State Univ, Dept Min & Minerals Engn, Blacksburg, VA 24061 USA

来源：

APPLIED CLAY SCIENCE | 2023年 / 231卷

基金：

美国国家科学基金会;

关键词：

Rare earth elements; Kaolinite; Iron oxyhydroxide; Ion-adsorption clays; Ion-exchange; X-ray photoelectron spectroscopy; REE GEOCHEMISTRY; WEATHERED CRUST; GRANITIC-ROCKS; MINERALIZATION; ORE;

D O I：

10.1016/j.clay.2022.106744

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The uptake mechanism and influence of iron (Fe) co-adsorption on the binding of rare-earth elements (REEs) on kaolinite have been investigated. REEs and varying concentrations of Fe were co-adsorbed onto kaolinite at pH 10.5. Inductively coupled plasma mass spectrometry (ICP-MS), powder X-ray diffraction (PXRD), and X-ray photoelectron spectroscopy (XPS) were used to characterize how Fe co-adsorption influenced the uptake mechanism of REEs on kaolinite. Elemental analysis by ICP-MS revealed that the REE concentrations on kaolinite were unaffected by the presence of Fe. Crystal structure of kaolinite, determined by PXRD, was not altered after REE and Fe co-adsorption. XPS suggests that the adsorbed Fe is in the form of FeOOH, while the greatly attenuated REE XPS signals upon Fe co-adsorption implies that REEs are encapsulated by Fe species. Based on these results, we conclude that FeOOH layers were formed on top of REEs on the surface of kaolinite. Synthesized REE-Fe-kaolinite samples respond poorly to ion-exchange leaching, indicating that Fe is detrimental to the REE ion-exchange efficiency. The inhibition of ion-exchange REE extraction appears to be due to the passivating FeOOH layers. In contrast to ion-exchange methods, reductive leaching was found to dissolve the FeOOH passivating layers and liberate REEs such that they became available for ion-exchange leaching.

引用

页数：7

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