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Title: Bioleaching of rare earth elements from waste phosphors and cracking catalysts

Journal Article · · Hydrometallurgy
 [1];  [1];  [1];  [2];  [1]
  1. Idaho National Lab. (INL), Idaho Falls, ID (United States). Biological and Chemical Processing Dept.
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Biosciences and Biotechnology Division

Four microbial cultures were evaluated for organic acid production and their potential utility for leaching of rare earth elements (REE) from retorted phosphor powder (RPP) and spent fluidized cracking catalyst (FCC). Three of the cultures (2 bacterial, 1 fungal) were isolated from environmental and industrial materials known to contain rare earth elements. The other was the well-known and industrially important bacterium Gluconobacter oxydans. Gluconic acid was the predominant identified organic acid produced by all of the cultures; citric and acetic acid were among the other acids detected. There was also maximum REE leaching by cell free culture supernatants obtained with Gluconobacter and the FCC; 49% of total REE was recovered, with preferential recovery of lanthanum over cerium. The phosphor powder was more difficult to leach; only ~2 % total REE was leached from RPP with Gluconobacter. Tests with the RPP indicated that the extent of REE solubilization was similar whether whole cell cultures or cell-free supernatants were used. However, Gluconobacter cell-free culture supernatants with 10-15 mM gluconic acid outperformed abiotically prepared leaching solutions with 30 mM gluconic acid concentrations. Abiotic tests showed that increasing gluconic acid concentrations increased leaching efficiency; for example, total REE leaching from FCC increased from 24 to 36 to 45% when gluconic acid was increased from 10 to 30 to 90 mM. Our research shows that utilizing microorganisms that produce gluconic acid can result in effective leaching of REE from waste materials, and optimizing gluconic acid production will improve recovery.

Research Organization:
Idaho National Lab. (INL), Idaho Falls, ID (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Advanced Manufacturing Office
Grant/Contract Number:
AC07-05ID14517; AC52-07NA27344
OSTI ID:
1357607
Alternate ID(s):
OSTI ID: 1359167
Report Number(s):
INL/JOU-16-37735; PII: S0304386X16305473
Journal Information:
Hydrometallurgy, Vol. 166, Issue C; ISSN 0304-386X
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 81 works
Citation information provided by
Web of Science

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Cited By (6)

Spent FCC E-Cat: Towards a Circular Approach in the Oil Refining Industry journal December 2018
Recovery of lanthanides from hydrocarbon cracking spent catalyst through chemical and biotechnological strategies journal February 2019
Bio-Reclamation of Strategic and Energy Critical Metals from Secondary Resources journal June 2017
Biotransformation of lanthanum by Aspergillus niger journal November 2018
Scandium, yttrium, and lanthanide contents in soil from Serbia and their accumulation in the mushroom Macrolepiota procera (Scop.) Singer journal January 2019
Role of microorganisms in bioleaching of rare earth elements from primary and secondary resources journal November 2018