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CC BY-NC-ND V4.0, Open Access
Journal article
Potential of blended byproduct caps for management of bauxite residues: How do texture and weathering impact geochemistry?
Resources, conservation and recycling, Vol.215, 108077
2025
Abstract
This study evaluated how successive leaching of caustic bauxite residues of different textures, coupled with blending with locally available byproducts, might improve geochemical characteristics of capping materials. Three bauxite residue textures (fines, fines plus 10 % residue sand and residue sand) were blended with three byproducts (fly ash, sewage water and eucalypt mulch) individually or in combination. Treatments were subject to leaching of three wetting/drying cycles over 18 weeks to mimic field weathering. The pH, salinity and Na concentration of blended materials decreased after leaching regardless of texture. Alkaline minerals (sodalite and calcite) content also decreased during weathering due to enhanced dissolution. Combined byproducts improved multiple chemical properties simultaneously more than any single byproduct. Further decreases in pH, sodicity and concentration of toxic elements are needed to improve suitability of blended capping materials for meeting closure targets, including vegetation establishment.
Details
- Title
- Potential of blended byproduct caps for management of bauxite residues: How do texture and weathering impact geochemistry?
- Authors/Creators
- Golam Taki - The University of Western AustraliaPauline F. Grierson - School of Biological Sciences, The University of Western Australia, 35 Stirling Highway, Crawley, Western Australia, 6009, AustraliaHelen E.A. Brand - Australian Nuclear Science and Technology OrganisationDaniel V. Murphy - Murdoch University, Centre for Sustainable Farming SystemsTalitha C. Santini - The University of Western Australia
- Publication Details
- Resources, conservation and recycling, Vol.215, 108077
- Publisher
- Elsevier B.V.
- Number of pages
- 13
- Grant note
- South32 Worsley Alumina Pty LtdAustralian GovernmentUniversity of Western AustraliaAINSE Limited
The authors would like to thank South32 Worsley Alumina Pty Ltd for funding this research. Part of this research was undertaken on the powder diffraction beamline (10BM1) at the Australian Synchrotron, part of ANSTO. The first author thanks the Australian Government for a Research Training Program Fees Offset scholarship and The University of Western Australia for the University Postgraduate Award. The first author also thanks AINSE Limited for providing financial assistance (AINSE-PGRA) .
- Identifiers
- 991005726582107891
- Copyright
- © 2024 The Author(s).
- Murdoch Affiliation
- Centre for Sustainable Farming Systems
- Language
- English
- Resource Type
- Journal article
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- Domestic collaboration
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- 7 Engineering & Materials Science
- 7.229 Mineral & Metal Processing
- 7.229.2385 Red Mud Valorization
- Web Of Science research areas
- Engineering, Environmental
- Environmental Sciences
- ESI research areas
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