Publication
Title
Processes determining the behaviour of chromium in chromite ore processing residue used as landfill
Author
Abstract
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.
Language
English
Source (journal)
Land contamination and reclamation. - Richmond
Publication
Richmond : EPP , 1999
ISSN
0967-0513
Volume/pages
7 (1999) , p. 271-279
UAntwerpen
Publication type
Subject
External links
Record
Identification
Creation 05.10.2018
Last edited 04.05.2021