Investigation of barium treatment of chromite ore processing residue
Barium addition to chromite ore processing residue COPR was investigated in order to address a the pronounced heaving phenomena that are associated with mainly the presence of ettringite and b hexavalent chromium leaching. Sulfate was added to representative samples of grey-black GB and hard-brown H...
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| مؤلفون آخرون: | , , , , , , |
| التنسيق: | article |
| منشور في: |
2017
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| الوصول للمادة أونلاين: | http://hdl.handle.net/10725/5967 http://libraries.lau.edu.lb/research/laur/terms-of-use/articles.php https://compass.astm.org/download/STP37685S.32648.pdf |
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| _version_ | 1864513478226608128 |
|---|---|
| author | Wazne, Mahmoud |
| author2 | Chrysochoou, Maria Dermatas, Dimitris Moon, Doek Hyun Christodoulatos, Christos French, Chris Morris, John Kaouris, Maria |
| author2_role | author author author author author author author |
| author_facet | Wazne, Mahmoud Chrysochoou, Maria Dermatas, Dimitris Moon, Doek Hyun Christodoulatos, Christos French, Chris Morris, John Kaouris, Maria |
| author_role | author |
| dc.creator.none.fl_str_mv | Wazne, Mahmoud Chrysochoou, Maria Dermatas, Dimitris Moon, Doek Hyun Christodoulatos, Christos French, Chris Morris, John Kaouris, Maria |
| dc.date.none.fl_str_mv | 2017-07-27T06:48:15Z 2017-07-27T06:48:15Z 2017 2017-08-10 |
| dc.identifier.none.fl_str_mv | 1546-962X http://hdl.handle.net/10725/5967 Chrysochoou, M., Dermatas, D., Moon, D. H., Christodoulatos, C., Wazne, M., French, C., ... & Kaouris, M. (2006). Investigation of barium treatment of chromite ore processing residue (COPR). In Contaminated Sediments: Evaluation and Remediation Techniques. ASTM International. http://libraries.lau.edu.lb/research/laur/terms-of-use/articles.php https://compass.astm.org/download/STP37685S.32648.pdf |
| dc.language.none.fl_str_mv | en |
| dc.relation.none.fl_str_mv | Journal of ASTM International |
| dc.rights.*.fl_str_mv | info:eu-repo/semantics/openAccess |
| dc.title.none.fl_str_mv | Investigation of barium treatment of chromite ore processing residue |
| dc.type.none.fl_str_mv | Article info:eu-repo/semantics/publishedVersion info:eu-repo/semantics/article |
| description | Barium addition to chromite ore processing residue COPR was investigated in order to address a the pronounced heaving phenomena that are associated with mainly the presence of ettringite and b hexavalent chromium leaching. Sulfate was added to representative samples of grey-black GB and hard-brown HB COPR to simulate worst-case conditions of sulfate influx and ettringite formation. Both the X-ray powder diffraction XRPD and the modeling results showed that ettringite is a thermodynamically favored reaction in COPR. The subsequent addition of barium lead to the formation of both barite and barium chromate, observed as solid solution between the two phases. Modeling results confirmed that barium sulfate is the more stable species that will dissolve ettringite and that barium chromate will also dissolve COPR chromate phases when sulfate is depleted. The Toxicity Characteristic Leaching Procedure TCLP test on GB samples showed that the optimal stoichiometry to maintain Cr and Ba TCLP concentrations below the U.S. Environmental Protection Agency regulatory limit of 5 and 100 ppm, respectively, lies between 1:1 Ba to sulfate plus chromate ratio and 1.5:1. The respective optimal stoichiometry for the HB COPR was found to be higher, between 2:1 and 5:1. Considering that COPR is actually a Crcontaminated cement form, a further area of research is the identification of barium-containing wastes i.e., heavy-metal sludges, contaminated soils, etc. that would be suitable for combination with COPR; in this way, an environmentally sustainable yet cost-effective treatment application can be realized. |
| eu_rights_str_mv | openAccess |
| format | article |
| id | LAURepo_d8e4edf5b75efed4c2facc935282ddf8 |
| identifier_str_mv | 1546-962X Chrysochoou, M., Dermatas, D., Moon, D. H., Christodoulatos, C., Wazne, M., French, C., ... & Kaouris, M. (2006). Investigation of barium treatment of chromite ore processing residue (COPR). In Contaminated Sediments: Evaluation and Remediation Techniques. ASTM International. |
| language_invalid_str_mv | en |
| network_acronym_str | LAURepo |
| network_name_str | Lebanese American University repository |
| oai_identifier_str | oai:laur.lau.edu.lb:10725/5967 |
| publishDate | 2017 |
| repository.mail.fl_str_mv | |
| repository.name.fl_str_mv | |
| repository_id_str | |
| spelling | Investigation of barium treatment of chromite ore processing residueWazne, MahmoudChrysochoou, MariaDermatas, DimitrisMoon, Doek HyunChristodoulatos, ChristosFrench, ChrisMorris, JohnKaouris, MariaBarium addition to chromite ore processing residue COPR was investigated in order to address a the pronounced heaving phenomena that are associated with mainly the presence of ettringite and b hexavalent chromium leaching. Sulfate was added to representative samples of grey-black GB and hard-brown HB COPR to simulate worst-case conditions of sulfate influx and ettringite formation. Both the X-ray powder diffraction XRPD and the modeling results showed that ettringite is a thermodynamically favored reaction in COPR. The subsequent addition of barium lead to the formation of both barite and barium chromate, observed as solid solution between the two phases. Modeling results confirmed that barium sulfate is the more stable species that will dissolve ettringite and that barium chromate will also dissolve COPR chromate phases when sulfate is depleted. The Toxicity Characteristic Leaching Procedure TCLP test on GB samples showed that the optimal stoichiometry to maintain Cr and Ba TCLP concentrations below the U.S. Environmental Protection Agency regulatory limit of 5 and 100 ppm, respectively, lies between 1:1 Ba to sulfate plus chromate ratio and 1.5:1. The respective optimal stoichiometry for the HB COPR was found to be higher, between 2:1 and 5:1. Considering that COPR is actually a Crcontaminated cement form, a further area of research is the identification of barium-containing wastes i.e., heavy-metal sludges, contaminated soils, etc. that would be suitable for combination with COPR; in this way, an environmentally sustainable yet cost-effective treatment application can be realized.PublishedN/A2017-07-27T06:48:15Z2017-07-27T06:48:15Z20172017-08-10Articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article1546-962Xhttp://hdl.handle.net/10725/5967Chrysochoou, M., Dermatas, D., Moon, D. H., Christodoulatos, C., Wazne, M., French, C., ... & Kaouris, M. (2006). Investigation of barium treatment of chromite ore processing residue (COPR). In Contaminated Sediments: Evaluation and Remediation Techniques. ASTM International.http://libraries.lau.edu.lb/research/laur/terms-of-use/articles.phphttps://compass.astm.org/download/STP37685S.32648.pdfenJournal of ASTM Internationalinfo:eu-repo/semantics/openAccessoai:laur.lau.edu.lb:10725/59672021-03-19T10:00:48Z |
| spellingShingle | Investigation of barium treatment of chromite ore processing residue Wazne, Mahmoud |
| status_str | publishedVersion |
| title | Investigation of barium treatment of chromite ore processing residue |
| title_full | Investigation of barium treatment of chromite ore processing residue |
| title_fullStr | Investigation of barium treatment of chromite ore processing residue |
| title_full_unstemmed | Investigation of barium treatment of chromite ore processing residue |
| title_short | Investigation of barium treatment of chromite ore processing residue |
| title_sort | Investigation of barium treatment of chromite ore processing residue |
| url | http://hdl.handle.net/10725/5967 http://libraries.lau.edu.lb/research/laur/terms-of-use/articles.php https://compass.astm.org/download/STP37685S.32648.pdf |