Long-term treatment issues with chromite ore processing residue (COPR)
A pugmill treatability study was conducted to remediate chromite ore processing residue (COPR) using ferrous sulfate heptahydrate (FeSO4·7H2O) as a reductant. Two different types of COPR, with respect to particle size and mineralogy, were tested in this study. Two different stoichiometric ratios of...
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2007
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| Online Access: | http://hdl.handle.net/10725/3227 http://dx.doi.org10.1016/j.jhazmat.2007.01.013 http://www.sciencedirect.com/science/article/pii/S0304389407000386 |
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| _version_ | 1864513460221509632 |
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| author | Moon, Deok Hyun |
| author2 | Wazne, Mahmoud Dermatas, Dimitris Christodoulatos, Christos Sanchez, Adriana M. Grubb, Dennis G. Chrysochoou, Maria Kim, Min Gyu |
| author2_role | author author author author author author author |
| author_facet | Moon, Deok Hyun Wazne, Mahmoud Dermatas, Dimitris Christodoulatos, Christos Sanchez, Adriana M. Grubb, Dennis G. Chrysochoou, Maria Kim, Min Gyu |
| author_role | author |
| dc.creator.none.fl_str_mv | Moon, Deok Hyun Wazne, Mahmoud Dermatas, Dimitris Christodoulatos, Christos Sanchez, Adriana M. Grubb, Dennis G. Chrysochoou, Maria Kim, Min Gyu |
| dc.date.none.fl_str_mv | 2007 2016-03-01T12:01:03Z 2016-03-01T12:01:03Z 2016-03-01 |
| dc.identifier.none.fl_str_mv | 0304-3894 http://hdl.handle.net/10725/3227 http://dx.doi.org10.1016/j.jhazmat.2007.01.013 Moon, D. H., Wazne, M., Dermatas, D., Christodoulatos, C., Sanchez, A. M., Grubb, D. G., ... & Kim, M. G. (2007). Long-term treatment issues with chromite ore processing residue (COPR): Cr 6+ reduction and heave. Journal of hazardous materials, 143(3), 629-635. http://www.sciencedirect.com/science/article/pii/S0304389407000386 |
| dc.language.none.fl_str_mv | en |
| dc.relation.none.fl_str_mv | Journal of Hazardous Materials |
| dc.rights.*.fl_str_mv | info:eu-repo/semantics/openAccess |
| dc.title.none.fl_str_mv | Long-term treatment issues with chromite ore processing residue (COPR) Cr6+ reduction and heave |
| dc.type.none.fl_str_mv | Article info:eu-repo/semantics/publishedVersion info:eu-repo/semantics/article |
| description | A pugmill treatability study was conducted to remediate chromite ore processing residue (COPR) using ferrous sulfate heptahydrate (FeSO4·7H2O) as a reductant. Two different types of COPR, with respect to particle size and mineralogy, were tested in this study. Two different stoichiometric ratios of FeSO4·7H2O to Cr6+ (5× and 8×) were applied to reduce Cr6+ to Cr3+. The effectiveness of FeSO4·7H2O treatment was assessed using the toxicity characteristic leaching procedure (TCLP) tests and X-ray absorption near edge structure (XANES) analyses. TCLP results obtained from the pugmill treatability study showed that TCLP Cr concentrations were less than the TCLP regulatory limit of 5 mg/L upon 8× FeSO4·7H2O treatment for up to 420 days but may fail to meet this regulatory limit in the long-term. XANES results obtained from samples cured for 300 days showed that all of the treated samples failed the New Jersey Department of Environmental Protection (NJDEP) clean up level for Cr6+ of 240 mg/kg. However, the Cr6+ concentration from the sample with the smaller particle size approached 240 mg/kg (338 mg/kg), suggesting that particle size reduction prior to the addition of reductant may improve the effectiveness of the treatment. COPR heaving was investigated with unconfined swell tests upon 5× and 8× FeSO4·7H2O treatment. The formation of ettringite, an expansive material, was investigated following the swell tests using X-ray powder diffraction (XRPD). Significant heaving (>50 vol%) was observed at curing times of 138 days for the 5× treatment and the ettringite formation was identified by XRPD analyses. |
| eu_rights_str_mv | openAccess |
| format | article |
| id | LAURepo_b20a6ae19c8ed17bc6daa3dd44956db7 |
| identifier_str_mv | 0304-3894 Moon, D. H., Wazne, M., Dermatas, D., Christodoulatos, C., Sanchez, A. M., Grubb, D. G., ... & Kim, M. G. (2007). Long-term treatment issues with chromite ore processing residue (COPR): Cr 6+ reduction and heave. Journal of hazardous materials, 143(3), 629-635. |
| language_invalid_str_mv | en |
| network_acronym_str | LAURepo |
| network_name_str | Lebanese American University repository |
| oai_identifier_str | oai:laur.lau.edu.lb:10725/3227 |
| publishDate | 2007 |
| repository.mail.fl_str_mv | |
| repository.name.fl_str_mv | |
| repository_id_str | |
| spelling | Long-term treatment issues with chromite ore processing residue (COPR)Cr6+ reduction and heaveMoon, Deok HyunWazne, MahmoudDermatas, DimitrisChristodoulatos, ChristosSanchez, Adriana M.Grubb, Dennis G.Chrysochoou, MariaKim, Min GyuA pugmill treatability study was conducted to remediate chromite ore processing residue (COPR) using ferrous sulfate heptahydrate (FeSO4·7H2O) as a reductant. Two different types of COPR, with respect to particle size and mineralogy, were tested in this study. Two different stoichiometric ratios of FeSO4·7H2O to Cr6+ (5× and 8×) were applied to reduce Cr6+ to Cr3+. The effectiveness of FeSO4·7H2O treatment was assessed using the toxicity characteristic leaching procedure (TCLP) tests and X-ray absorption near edge structure (XANES) analyses. TCLP results obtained from the pugmill treatability study showed that TCLP Cr concentrations were less than the TCLP regulatory limit of 5 mg/L upon 8× FeSO4·7H2O treatment for up to 420 days but may fail to meet this regulatory limit in the long-term. XANES results obtained from samples cured for 300 days showed that all of the treated samples failed the New Jersey Department of Environmental Protection (NJDEP) clean up level for Cr6+ of 240 mg/kg. However, the Cr6+ concentration from the sample with the smaller particle size approached 240 mg/kg (338 mg/kg), suggesting that particle size reduction prior to the addition of reductant may improve the effectiveness of the treatment. COPR heaving was investigated with unconfined swell tests upon 5× and 8× FeSO4·7H2O treatment. The formation of ettringite, an expansive material, was investigated following the swell tests using X-ray powder diffraction (XRPD). Significant heaving (>50 vol%) was observed at curing times of 138 days for the 5× treatment and the ettringite formation was identified by XRPD analyses.PublishedN/A2016-03-01T12:01:03Z2016-03-01T12:01:03Z20072016-03-01Articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article0304-3894http://hdl.handle.net/10725/3227http://dx.doi.org10.1016/j.jhazmat.2007.01.013Moon, D. H., Wazne, M., Dermatas, D., Christodoulatos, C., Sanchez, A. M., Grubb, D. G., ... & Kim, M. G. (2007). Long-term treatment issues with chromite ore processing residue (COPR): Cr 6+ reduction and heave. Journal of hazardous materials, 143(3), 629-635.http://www.sciencedirect.com/science/article/pii/S0304389407000386enJournal of Hazardous Materialsinfo:eu-repo/semantics/openAccessoai:laur.lau.edu.lb:10725/32272019-02-04T08:46:38Z |
| spellingShingle | Long-term treatment issues with chromite ore processing residue (COPR) Moon, Deok Hyun |
| status_str | publishedVersion |
| title | Long-term treatment issues with chromite ore processing residue (COPR) |
| title_full | Long-term treatment issues with chromite ore processing residue (COPR) |
| title_fullStr | Long-term treatment issues with chromite ore processing residue (COPR) |
| title_full_unstemmed | Long-term treatment issues with chromite ore processing residue (COPR) |
| title_short | Long-term treatment issues with chromite ore processing residue (COPR) |
| title_sort | Long-term treatment issues with chromite ore processing residue (COPR) |
| url | http://hdl.handle.net/10725/3227 http://dx.doi.org10.1016/j.jhazmat.2007.01.013 http://www.sciencedirect.com/science/article/pii/S0304389407000386 |