Bioleaching of rare earth elements from waste phosphors and cracking catalysts [electronic resource]

• Ngôn ngữ: eng
• Ký hiệu phân loại: 541.3 Miscellaneous topics in physical chemistry
• Thông tin xuất bản: Washington, D.C. : Oak Ridge, Tenn. : United States. Dept. of Energy. Office of Energy Efficiency and Renewable Energy ; Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2016
• Mô tả vật lý: Size: p. 34-40 : , digital, PDF file.
• Bộ sưu tập: Metadata
• ID: 260771
• Chủ đề: 1. 37 inorganic, organic, physical, and analytical chemistry; 2. 60 applied life sciences; 3. Fluid catalytic cracking catalyst; 4. Gluconic acid; 5. Heterotrophic bioleaching; 6. Rare earth elements; 7. Retorted phosphor powders; 8. Urban biomining

Tóm tắt

 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.