Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 384, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2019.121462
Keywords
Bioleaching; High-pressure acid leaching residue; Metals removal; Community structure
Categories
Funding
- National key R & D program Task, China [2017YFD0801304]
- Research Innovation Project for Graduate Student of Central South University [502221802]
- Deep Sea Biological Resource Program, China [DY135-B2]
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Removal of metals from high pressure acid leaching (HPAL) residue was essential to alleviate potential environmental threat and avoid valuable metals loss. However, cost-effective metals extraction from HPAL residue remains a difficulty. In this study, a hybrid bioleaching process was developed for Co and Cu extraction from HPAL residue of Cu-Co sulfide ores. Results for microbial community structure optimization showed that moderate thermophilum consortium with coexistence of iron oxidizer and sulfur oxidizer was more efficient on metal extraction compared with mesophiles. Further addition of citric acid, Fe (II) and S-0 significantly enhanced the release of metals through improving the total biomass, attached cells and community diversity. As a result, 87.91% of cobalt and 58.52% of copper were extracted at initial pH 1.4 and pulp density of 50 g/L by hybrid bioleaching. The hazardous potential assessments revealed that the bioleached residue could be disposed safely. These findings demonstrated that organic acids assisting bioleaching with community adjusting was a promising strategy for metals removal from HPAL residue.
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