Impact of brownmillerite hydration on Cr(VI) sequestration in chromite ore processing residue

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dc.contributor.author Moon, Deok Hyun
dc.contributor.author Wazne, Mahmoud
dc.date.accessioned 2016-02-29T13:13:50Z
dc.date.available 2016-02-29T13:13:50Z
dc.date.copyright 2011
dc.date.issued 2016-02-29
dc.identifier.issn 1226-4806 en_US
dc.identifier.uri http://hdl.handle.net/10725/3213
dc.description.abstract Experimental and modeling studies were conducted to delineate the reaction progress of chromite ore processing residue (COPR) upon hydration and the roles of brownmillerite and calcium aluminum chromium oxide hydrates (CAC) in the scavenging of hexavalent chromium. A kinetic study was conducted by preparing slurry samples with both synthetic brownmillerite and actual COPR samples at ambient temperatures. The hydration reaction of brownmillerite using synthetic brownmillerite was very fast (within 1 hour) and was completed within 2 days. However, the hydration of brownmillerite embedded in COPR to its hydration byproducts was not clearly observed after 7 days of aging. Newly formed Ca4Al2O6(CrO4)·14H2O (CAC-14) was observed after 1 hour of aging in both samples. However, the rate of formation of CAC-14 with synthetic brownmillerite was much faster than the COPR embedded brownmillerite. The reaction progress of synthetic brownmillerite and COPR upon chromate influx was simulated by a reaction path modeling program. The phase transformation of both samples can be predicted by the constructed model. Moreover, the formation of CACs upon chromate addition was predicted by the model, suggesting an effective sink for Cr(VI). en_US
dc.language.iso en en_US
dc.title Impact of brownmillerite hydration on Cr(VI) sequestration in 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 Geosciences Journal en_US
dc.journal.volume 15 en_US
dc.journal.issue 3 en_US
dc.article.pages 287-296 en_US
dc.keywords Chromite ore processing residue en_US
dc.keywords Brownmillerite en_US
dc.keywords Calcium aluminum chromium oxide hydrates en_US
dc.keywords Hexavalent chromium en_US
dc.identifier.doi http://dx.doi.org/10.1007/s12303-011-0023-y en_US
dc.identifier.ctation Moon, D. H., & Wazne, M. (2011). Impact of brownmillerite hydration on Cr (VI) sequestration in chromite ore processing residue. Geosciences Journal, 15(3), 287-296. en_US
dc.author.email mahmoud.wazne@lau.edu.lb
dc.identifier.url http://link.springer.com/article/10.1007/s12303-011-0023-y

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