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Technical Development of Impurity
Removal in Mineral Processing Reduction of Arsenic in Copper Concentrates
Professor Neville Plint
Director: Sustainable Minerals Institute
Our purpose is to create change for
Responsible Resource Development
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The University of Queensland’s Sustainable Mineral Institute
The University of Queensland’s Sustainable Mineral Institute
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The University of Queensland’s Sustainable Mineral Institute
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UQ is a top 50 University
Ranked No 1 in the world for mining and minerals engineering 2018
Shanghai Rankings global subject rankings
Game changing leaders1
2 Partnerships
3 Global impact
Future Focused
Institute’s strengths
1
2
Breadth and Depth 3
Multi-disciplinary
Values driven
4
Independent
4 Infrastructure
Unlocking Complex
Orebodies
Transforming Mine
Lifecycles
Digital Mine
Organisation
Governance and
Leadership
Transformational
Learning
Health and Safety
Social
Responsibility
Water
Management
Land Rehabilitation
Mining and
Metallurgy
Geology
Integrated, applied research addressing global challenges
Increasing demand and decreasing grades……
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Copper supply crunch earlier than predicted – experts, Hamish
Sampson, Analyst at CRU’s Copper Team. Mining.com
Complex Orebodies Program - Undeveloped copper deposits
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*S&P Market Intelligence; deposits that
contain >500kT Cu metal & are not
production-visible
Prof. Rick Valenta – Program Lead and Director, Sustainable
Mineral Institute. Complex orebody program.
Complex Orebodies Program - Undeveloped copper deposits
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535mT
Cu metal
Prof. Rick Valenta – Program Lead and Director, Sustainable
Mineral Institute. Complex orebody program.
Complex concentrates
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Source: Wood Mackenzie 2013, Teck- Aurubis, Expomin 2014 (Schwartz et al 2017)
Prof. Rick Valenta – Program Lead and Director, Sustainable
Mineral Institute. Complex orebody program.
Challenges of arsenic management across the value chain
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Mining Processing Smelting Hydro-met Tailing
Arsenic emissions upon roasting.
High financial penalties by smelters.
Economics of
selective mining
Similarity in physicochemical characteristics during flotation.
Lack of market for high arsenic concentrate.
Not amenable to conventional leaching technologies.
Requirement for Safe storage of final residues.
Ground and surface water contaminants.
Requirement for safe storage of final processing residues.
Adapted from Maedeh Tayebi-Khorami,
IMPC 2018 conference presentation
Is it possible to remove Arsenic bearing minerals by flotation?
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Chalcopyrite (CuFeS2) – 34wt% - Cu Chalcocite(CuS2) Enargite (Cu2AsS4) – 48wt%Cu
Dr. Lisa Forbes – Research leader, Sustainable Mineral,
Separations
What feed do we need for down stream processes?
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Focus of our research
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Dr. Lisa Forbes – Research leader, Sustainable Mineral,
Separations
Opportunity – selective separation
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Reference: Senior (2006), single
mineral study
Bulk Flotation
Eh +200
Arsenic Separation
Eh 0
High Cu - Low As
ConcentrateLow Cu - High As
Concentrate
Tailing
DamCopper Flotation
Eh +200
Can this approach be applied to a complex copper ore?
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Adapted from Maedeh Tayebi-Khorami,
IMPC 2018 conference presentation
Ore deposit behaves differently
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Adapted from Maedeh Tayebi-Khorami,
IMPC 2018 conference presentation
Differential size reduction
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Adapted from Maedeh Tayebi-Khorami,
IMPC 2018 conference presentation
Proposed flowsheet using size deportment and electrochemistry
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Reference – Tayebi-Khorabi, PhD Thesis, 2016, UQ
New developments that have the potential to enhance separation
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Reference: Kym Runge – Group Lead SMI-JKMRC
International collaborations to address arsenic
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# Springer International Publishing AG 2018
Reference: Chen et al , Chapter 18, A. van der Ent et al. (eds.), Agromining: Farming for Metals, Mineral
Resource Reviews, DOI 10.1007/978-3-319-61899-9_17
Land rehabilitation using phyto-extraction
Pteris vittata can grow in tailings with levels of As over 20,000ppm.
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Ref. P. Erskine and , A. van der Ent et al. unpublished results
Can plant teach us about selective separation?
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Reference: Adapted from Ali et al. (2009) and Briat (2010)
• Manage arsenic at source
• Value chain optimization – flexible integrated circuits
• Opportunities for further research
Conclusion
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Research conducted by Maedeh Tayebi-Khorami for her PhD thesis,
Supervised by M., Manlapig, E., Forbes, E., Bradshaw, D., Edraki, M
Sponsored by UQ/SMI and CSIRO
Contributions from Prof. Rick Valenta, Prof. Kym Runge and Prof. Peter Erskine
Acknowledgements
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Prof. Neville Plint | Director
Sustainable Minerals Institute
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Instagram.com/uniofqld
@SMI_UQ
Sustainable Minerals Institute
Thank you
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