Investigating Physicochemical Methods to Recover Rare-Earth Elements from Appalachian Coals

被引:0
作者
Yesenchak, Rachel [1 ]
Montross, Scott [2 ]
Sharma, Shikha [1 ]
机构
[1] West Virginia Univ, Dept Geol & Geog, Morgantown, WV 26506 USA
[2] US DOE, Natl Energy Technol Lab, Albany, OR 97321 USA
关键词
rare-earth elements; REE; coal; underclay; citric acid; FIRE-CLAY COAL; ACID; SEPARATION; EXTRACTION; MINERALS; YTTRIUM;
D O I
10.3390/min14111106
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 demand for rare-earth elements is expected to grow due to their use in critical technologies, including those used for clean energy generation. There is growing interest in developing unconventional rare-earth element resources, such as coal and coal byproducts, to help secure domestic supplies of these elements. Within the U.S., Appalachian Basin coals are particularly enriched in rare-earth elements, but recovery of the elements is often impeded by a resistant aluminosilicate matrix. This study explores the use of calcination and sodium carbonate roasting pre-treatments combined with dilute acid leaching to recover rare-earth elements from Appalachian Basin coals and underclay. The results suggest that rare-earth element recovery after calcination is dependent on the original mineralogy of samples and that light rare-earth minerals may be more easily decomposed than heavy rare-earth minerals. Sodium carbonate roasting can enhance the recovery of both light and heavy rare-earth elements. Maximum recovery in this study, ranging from 70% to 84% of total rare-earth elements, was achieved using a combination of calcination and sodium carbonate roasting, followed by 0.25 M citric acid leaching.
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页数:18
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