Remediation of chromite ore processing residue using ferrous sulfate and calcium polysulfide

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dc.contributor.author Wazne, Mahmoud
dc.contributor.author Moon, Deok Hyun
dc.contributor.author Jagupilla, Santhi Chandra
dc.contributor.author Christodoulatos, Christos
dc.contributor.author Dermatas, Dimitris
dc.contributor.author Chrysochoou, Maria
dc.date.accessioned 2016-03-01T12:36:36Z
dc.date.available 2016-03-01T12:36:36Z
dc.date.copyright 2007
dc.date.issued 2016-03-01
dc.identifier.issn 1226-4806 en_US
dc.identifier.uri http://hdl.handle.net/10725/3228
dc.description.abstract Batch tests were conducted to assess the potential use of ferrous sulfate and calcium polysulfide for the remediation of chromite ore processing residue (COPR). The remediation process entails addition of ferrous sulfate or calcium polysulfide to chemically reduce hexavalent chromium [Cr(VI)] to trivalent chromium [Cr(III)] in slurry form and pH adjustment to precipitate Cr(III) as chromium hydroxide. The present study investigates the effects of COPR particle size, treatment pH, and chemical dosage on the performance of the treatment. Smaller particle size resulted in increases in alkaline digestion and Toxicity Characteristic Leaching Procedure (TCLP) Cr(VI) concentrations for the untreated samples. The chemical reduction of Cr(VI) with ferrous iron and sulfides was non-stoichiometric. Four times the stoichiometric amount of ferrous iron of two times the stoichiometric amount of polysulfide were needed to meet both the New Jersey Department of Environmental Protection (NJDEP) regulatory limit of 240 mg/kg for Cr(VI) and EPA TCLP regulatory limit of 5 mg/L for chromium [C,r]. pH adjustment was necessary to prevent the formation of ettringite, a swell causing mineral, upon the introduction of sulfate to the COPR material via ferrous sulfate or calcium polysulfide. The slow hydration of some COPR minerals caused the pH of the treated COPR to creep upward during the curing period. However, when sufficient acid was added, the pH value was controlled at less than 9.27 for a curing period of 1.5 years, which prevented the formation of ettringite. en_US
dc.language.iso en en_US
dc.title Remediation of chromite ore processing residue using ferrous sulfate and calcium polysulfide 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 Geosciences Journal en_US
dc.journal.volume 11 en_US
dc.journal.issue 2 en_US
dc.article.pages 105-110 en_US
dc.keywords Chromite en_US
dc.keywords COPR en_US
dc.keywords Ettringite en_US
dc.keywords Ferrous en_US
dc.keywords Polysulfide en_US
dc.identifier.doi http://dx.doi.org/10.1007/BF02913922 en_US
dc.identifier.ctation Wazne, M., Moon, D. H., Jagupilla, S. C., Jagupilla, S. C., Christodoulatos, C., Dermatas, D., & Chrysochoou, M. (2007). Remediation of chromite ore processing residue using ferrous sulfate and calcium polysulfide. Geosciences Journal, 11(2), 105-110. en_US
dc.author.email mahmoud.wazne@lau.edu.lb
dc.identifier.url http://link.springer.com/article/10.1007/BF02913922

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