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Title: Speciation of rare earth elements in acid mine drainage precipitates by sequential extraction

Journal Article · · Minerals Engineering
 [1];  [2];  [3];  [3]
  1. Chinese Academy of Sciences (CAS), Beijing (China); Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
  2. Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
  3. West Virginia Univ., Morgantown, WV (United States)

Recent efforts have shown that acid mine drainage precipitates (AMDp) may be a promising source of rare earth elements and critical materials (REE/CM). To better understand this resource, several particle characterization studies were conducted on AMDp samples from three AMD treatment sites in Northern and Central Appalachia. This work included the determination of particle size, size distribution, morphology, mineralogy, chemical speciation, and rare earth content. While the particle characteristics and mineralogy varied considerably from site to site, sequential extraction tests showed that the largest portion of REEs (45% to 75%) were found in soluble phases bound to Fe-Mn oxides. Further, carbonates (5% to 16%) and insoluble residues (4% to 24%) were also found to be significant in some samples, suggesting that different AMD chemistry and AMD treatment approaches can lead to substantial variation in the deportment of REEs to the various chemical phases. Altogether, the results suggest that chemical extraction of REEs from AMDp can be achieved under mild conditions with high recovery values; however, the significant site-by-site variation will necessitate detailed testing of individual samples to determine the overall economic viability.

Research Organization:
West Virginia Univ., Morgantown, WV (United States); Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
Sponsoring Organization:
USDOE Office of Fossil Energy (FE)
Grant/Contract Number:
FE0026927
OSTI ID:
1908177
Journal Information:
Minerals Engineering, Vol. 168; ISSN 0892-6875
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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