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Title
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Processes determining the behaviour of chromium in chromite ore processing residue used as landfill
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Author
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Abstract
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| The processes determining the chemical behaviour of chromium have been assessed with respect to chromite ore processing residue (COPR), which has been deposited as landfill in parts of the South East of Glasgow. This chemical residue has a pH of about 12 and contains both trivalent and hexavalent chromium. Measured aqua regia extract-able Cr concentrations are 300 mmol/kg dry material, of which at least 5% is in the Cr(VI) oxidation state. Oxidation of Cr(III) on the landfill sites is highly unlikely because of the chemistry and pH of the material, and therefore it can be assumed that the source of Cr(VI) is finite. Processes which determine the behaviour of chromium in COPR are the aqueous speciation of Cr(III) and Cr(VI), dissolution of solid phases, and, from the point of view of remediative treatment, the reduction of Cr(VI) to Cr(III). For both dissolution and reduction, the kinetics of these reactions must be taken into account. |
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Language
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English
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Source (journal)
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Land contamination and reclamation. - Richmond
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Publication
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Richmond
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EPP
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1999
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ISSN
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0967-0513
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Volume/pages
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7
(1999)
, p. 271-279
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