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New approaches for extracting and recovering metals from mine tailings
Open accessAbstract
Waste materials from metal mining, such as mineral tailings, often contain significant amounts of potentially valuable metals particularly where, as in many historic operations, the efficiency of flotation technologies used to concentrate target minerals was not as good as those currently available. A two-stage mineral leaching and metal recovery protocol was developed to extract copper from tailings generated as waste materials in two mines currently operating in Spain and Serbia. The most effective extraction of copper (84 to >90%) was achieved by bioleaching the tailings at 45 °C, using a defined microbial consortium, where elemental sulfur was added to the tailings and the pH of leach liquors allowed to fall to ∼pH 1, at which point anaerobic conditions were imposed. The thermo-tolerant acidophiles Acidithiobacillus caldus and Sulfobacillus thermosulfidooxidans emerged as the dominant bacteria present in both tailings leachates under these conditions. Copper present in the pregnant leach solutions (PLS) produced were next precipitated as a sulfide phase using hydrogen sulfide generated in a low pH (4.0) sulfidogenic bioreactor. The off-line system used allowed the copper present in PLS to be precipitated selectively without the need to adjust the pH of the PLS, though small amounts of silver present in PLS from one of the tailings samples co-precipitated with copper sulfide. Experimental data also suggested that it would be possible to extract silver from bioleached solid residues (where it was mostly found) using a simple chemical extractant. The results suggested that bio-processing these waste materials would have economic as well as environmental benefits.
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Cites
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Environmental impact of direct lithium extraction from brines
Vera, M. L., Torres, W. R., Galli, C. I., Chagnes, A., & Flexer, V. (2023) · Nature Reviews Earth & Environment · doi:10.1038/s43017-022-00387-5 · Cited by 766
Towards circular economy in mining: Opportunities and bottlenecks for tailings valorization
Kinnunen, P. H.-M., & Kaksonen, A. H. (2019) · Journal of Cleaner Production · doi:10.1016/j.jclepro.2019.04.171 · Cited by 312
Transparency on greenhouse gas emissions from mining to enable climate change mitigation
Azadi, M., Northey, S. A., Ali, S. H., & Edraki, M. (2020) · Nature Geoscience · doi:10.1038/s41561-020-0531-3 · Cited by 261
Towards sustainable extraction of technology materials through integrated approaches
Pell, R., Tijsseling, L., Goodenough, K., Wall, F., Dehaine, Q., Grant, A., Deak, D., Yan, X., & Whattoff, P. (2021) · Nature Reviews Earth & Environment · doi:10.1038/s43017-021-00211-6 · Cited by 147
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Metadata
- Authors
- Falagán, C., Grail, B. M., & Johnson, D. B.
- Venue
- Minerals Engineering
- Publisher
- Elsevier BV
- Published
- 2017-05
- Volume
- 106
- Pages
- 71-78
- ISSN
- 0892-6875 (ISSN-L)
- OpenAlex
- W2531482858
- Cited by
- 326
- References
- 1
- FWCI
- 8.21
- Type
- journal article
- Language
- en
- Open access
- hybrid
- Licence
- www.elsevier.com/tdm/userlicense/1.0/ (tdm)
- creativecommons.org/licenses/by/4.0/ (vor)
- Funders
- Natural Environment Research Council (NE/L014076/1)
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