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Evaluation of ettringite-related swelling mechanisms for treated chromite ore processing residue.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Sanchez, Adriana M. Park, Jeong-Hun Wazne, Mahmoud Dermatas, Dimitris Cheong, Kyung Hoon Moon, Deok Hyun
Description	Author Affiliation: Moon DH ( Department of Environmental Engineering, Chosun University, Gwangju, 501-759, Republic of Korea, dmoon10@hotmail.com.)
Abstract	Accelerated one-dimensional unconfined swell tests were conducted for ferrous sulfate chromite ore processing residue (COPR) field-treated samples. The field-treated samples were subjected to wet and dry cycles over 100 days to accelerate the lithification of the samples. Parallel laboratory experiments were performed to investigate the effects of mineralogy on COPR swell under controlled conditions. The field and laboratory samples were treated with ferrous sulfate at a ferrous-to-Cr(6+) molar stoichiometric ratios of eight (8×) and five (5×). X-ray powder diffraction (XRPD) and scanning electron microscopy (SEM)-energy dispersive X-ray spectroscopy (EDX) analyses were used to investigate the mineralogical changes upon treatment. The swell results indicated that significant COPR swelling was observed in all of the tested samples. The swelling was more pronounced in the 5× treated COPR sample than in the 8× treated COPR sample. Moreover, the laboratory-treated samples showed greater swelling behavior as compared with the field-treated samples, which was most probably due to the high dry density of the COPR, indicating that dry density was a more dominant factor than lithification. XRPD and SEM-EDX results confirmed that significant ettringite formation occurred in all treated samples.
ISSN	09441344
Issue Number	1
Volume Number	22
e-ISSN	16147499
Journal	Environmental Science and Pollution Research
Language	English
Publisher	Springer
Publisher Date	2015-01-01
Publisher Place	Germany
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Environmental Pollution Ferrous Compounds Chemistry Industrial Waste Minerals Extraction And Processing Industry Microscopy, Electron, Scanning Spectrometry, X-ray Emission X-ray Diffraction Evaluation Studies Journal Article Discipline Environmental Science Discipline Environmental Chemistry
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Health, Toxicology and Mutagenesis Pollution Medicine

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Evaluation of ettringite-related swelling mechanisms for treated chromite ore processing residue

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

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Swelling related to ettringite crystal formation in chromite ore processing residue

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Evaluation of ettringite-related swelling mechanisms for treated chromite ore processing residue.

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