Leaching Mechanisms of Cr(VI) from Chromite Ore Processing Residue

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dc.contributor.author Wazne, Mahmoud
dc.contributor.author Jagupilla, Santhi Chandra
dc.contributor.author Moon, Deok Hyun
dc.contributor.author Christodoulatos, Christos
dc.contributor.author Koutsospyros, Agamemnon
dc.date.accessioned 2016-03-01T07:57:28Z
dc.date.available 2016-03-01T07:57:28Z
dc.date.copyright 2007
dc.date.issued 2016-03-01
dc.identifier.issn 0047-2425 en_US
dc.identifier.uri http://hdl.handle.net/10725/3221
dc.description.abstract Batch leaching tests, qualitative and quantitative x-ray powder diffraction (XRPD) analyses, and geochemical modeling were used to investigate the leaching mechanisms of Cr(VI) from chromite ore processing residue (COPR) samples obtained from an urban area in Hudson County, New Jersey. The pH of the leaching solutions was adjusted to cover a wide range between 1 and 12.5. The concentration levels for total chromium (Cr) and Cr(VI) in the leaching solutions were virtually identical for pH values >5. For pH values <5, the concentration of total Cr exceeded that of Cr(VI) with the difference between the two attributed to Cr(III). Geochemical modeling results indicated that the solubility of Cr(VI) is controlled by Cr(VI)-hydrocalumite and Cr(VI)-ettringite at pH >10.5 and by adsorption at pH <8. However, experimental results suggested that Cr(VI) solubility is controlled partially by Cr(VI)-hydrocalumite at pH >10.5 and by hydrotalcites at pH >8 in addition to adsorption of anionic chromate species onto inherently present metal oxides and hydroxides at pH <8. As pH decreased to <10, most of the Cr(VI) bearing minerals become unstable and their dissolution contributes to the increase in Cr(VI) concentration in the leachate solution. At low pH ( <1.5), Cr(III) solid phases and the oxides responsible for Cr(VI) adsorption dissolve and release Cr(III) and Cr(VI) into solution. en_US
dc.language.iso en en_US
dc.title Leaching Mechanisms of Cr(VI) from Chromite Ore Processing Residue en_US
dc.type Article en_US
dc.description.version Published en_US
dc.author.school SOE en_US
dc.author.idnumber 201205627 en_US
dc.author.woa N/A en_US
dc.author.department Civil Engineering en_US
dc.description.embargo N/A en_US
dc.relation.journal Journal of Environmental Quality en_US
dc.journal.volume 37 en_US
dc.journal.issue 6 en_US
dc.article.pages 2125-2134 en_US
dc.identifier.doi http://dx.doi.org/10.2134/jeq2007.0443 en_US
dc.identifier.ctation Wazne, M., Jagupilla, S. C., Moon, D. H., Christodoulatos, C., & Koutsospyros, A. (2008). Leaching mechanisms of Cr (VI) from chromite ore processing residue. Journal of environmental quality, 37(6), 2125-2134. en_US
dc.author.email mahmoud.wazne@lau.edu.lb
dc.identifier.url https://dl.sciencesocieties.org/publications/jeq/abstracts/37/6/2125

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