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A field assessment of bauxite residue rehabilitation strategies
Science of The Total Environment, 2019Bauxite residue, the by-product of the alumina industry, is mainly stored in land-based bauxite residue disposal areas (BRDAs). Environmental concern has been raised due to the large volumes in stockpile, the high alkalinity of the material, as well as the presence of elevated concentrations of trace elements.
Elisa Di Carlo +2 more
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Alkalinity conversion of bauxite refinery residues by neutralization
Journal of Hazardous Materials, 2010Red mud remains the largest environmental issue for the alumina industry due to its high pH (>13), fine-grained nature (>90% is 50 g/kg), and soluble alkalinity (approximately 30 g/kg as equivalent CaCO(3)), which reduce the transport and reuse options of red mud.
Johnston, M +3 more
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Thixotropic behaviour of concentrated bauxite residue suspensions
Rheologica Acta, 1985An experimental study on the time-dependent rheology of highly concentrated and flocculated suspensions of bauxite residue (red mud) is presented. Both the thixotropic breakdown with shear and recovery at rest have been quantitatively examined using a vane-shear instrument and a capillary rheometer. It is demonstrated that both the yield stress and the
Q. D. Nguyen, D. V. Boger
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An ecological assessment of rehabilitated bauxite residue
Ecological Engineering, 2014Abstract Assessment of soil biological communities and activity may be a valuable indicator of ecological stress and ecosystem function in rehabilitated bauxite residues. Establishment of keystone species and evidence of processes such as decomposition have been demonstrated on a number of mine spoil types but not on alkaline, sodic bauxite residue.
R. Courtney, E. Feeney, A. O’Grady
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Rheology of concentrated bauxite residue suspensions
2017In the Bayer process where aluminium oxide is extracted from bauxite, a solid residue is generated and accumulated in enormous quantities. A typical alumina refinery may produce 10,000 tonnes per day of dry solid waste, one-third to one-half of which is fine mud, known as red mud, and the remainder is sand-sized materials.
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Accelerating Bauxite Residue Remediation with Microbial Biotechnology
2019Biological neutralisation of pH, driven by the microbial fermentation of added organic carbon substrates such as glucose, has recently emerged as a promising technique for remediation of bauxite residue, dropping pH from >11 to
Santini, T. C. +9 more
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Transforming bauxite residue into soil
2016The annual production of red mud, a by-product from the Bayer process of alumina production, is estimated at 120 Mt. Red mud deposit could be bioremediated (Grafe and Klauber 2011). A low cost and sustainable in situ remediation method for transformation of bauxite residue into soil is designed and tested.
Hennebert, Pierre +3 more
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Manufactured soil: A new use for bauxite residue
Science of The Total EnvironmentBauxite processing residue produced at an Alumina refinery was used to produce manufactured soil. The residue was first acidified and then leached to remove excess salts. Green waste compost was added at rates of 5 and 10 % w/w, with or without the addition of 20 % w/w dune sand.
X, Weng, R J, Haynes, Y F, Zhou
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Induction of Biological Activity in Bauxite Residue
2016Bauxite residue lakes constitute the major environmental problem at alumina processing plants because their high alkalinity content is hostile to flora and fauna. Bench experiments have been conducted to determine if bauxite residue can be made non-hostile through biological activity.
F. S. Williams, M. K. Hamdy
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