Geochemical fractionation of hazardous elements in fresh and drilled weathered South African coal fly ashes

The chemical reactions of dry-disposed ash dump, ingressed oxygen, carbon dioxide, and infiltrating rainwater affect mineralogical transformation, redistribution, and migration of chemical species. Composite samples of weathered coal fly ash taken at various depths and fresh coal fly ash were examin...

Full description

Autores:
Akinyemi, S. A.
Gitari, W. M.
Thobakgale, R.
Petrik, L. F.
Nyakuma, B. B.
Hower, J. C.
Ward, C. R.
Silva, Marcos Leandro
Silva Oliveira, Luis Felipe
Tipo de recurso:
http://purl.org/coar/resource_type/c_816b
Fecha de publicación:
2020
Institución:
Corporación Universidad de la Costa
Repositorio:
REDICUC - Repositorio CUC
Idioma:
eng
OAI Identifier:
oai:repositorio.cuc.edu.co:11323/5817
Acceso en línea:
https://hdl.handle.net/11323/5817
https://repositorio.cuc.edu.co/
Palabra clave:
Weathered ash
Fresh ash
Organic petrography
Sequential extraction
Metal mobility
Mineral transformations
Rights
openAccess
License
CC0 1.0 Universal
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oai_identifier_str oai:repositorio.cuc.edu.co:11323/5817
network_acronym_str RCUC2
network_name_str REDICUC - Repositorio CUC
repository_id_str
dc.title.spa.fl_str_mv Geochemical fractionation of hazardous elements in fresh and drilled weathered South African coal fly ashes
title Geochemical fractionation of hazardous elements in fresh and drilled weathered South African coal fly ashes
spellingShingle Geochemical fractionation of hazardous elements in fresh and drilled weathered South African coal fly ashes
Weathered ash
Fresh ash
Organic petrography
Sequential extraction
Metal mobility
Mineral transformations
title_short Geochemical fractionation of hazardous elements in fresh and drilled weathered South African coal fly ashes
title_full Geochemical fractionation of hazardous elements in fresh and drilled weathered South African coal fly ashes
title_fullStr Geochemical fractionation of hazardous elements in fresh and drilled weathered South African coal fly ashes
title_full_unstemmed Geochemical fractionation of hazardous elements in fresh and drilled weathered South African coal fly ashes
title_sort Geochemical fractionation of hazardous elements in fresh and drilled weathered South African coal fly ashes
dc.creator.fl_str_mv Akinyemi, S. A.
Gitari, W. M.
Thobakgale, R.
Petrik, L. F.
Nyakuma, B. B.
Hower, J. C.
Ward, C. R.
Silva, Marcos Leandro
Silva Oliveira, Luis Felipe
dc.contributor.author.spa.fl_str_mv Akinyemi, S. A.
Gitari, W. M.
Thobakgale, R.
Petrik, L. F.
Nyakuma, B. B.
Hower, J. C.
Ward, C. R.
Silva, Marcos Leandro
Silva Oliveira, Luis Felipe
dc.subject.spa.fl_str_mv Weathered ash
Fresh ash
Organic petrography
Sequential extraction
Metal mobility
Mineral transformations
topic Weathered ash
Fresh ash
Organic petrography
Sequential extraction
Metal mobility
Mineral transformations
description The chemical reactions of dry-disposed ash dump, ingressed oxygen, carbon dioxide, and infiltrating rainwater affect mineralogical transformation, redistribution, and migration of chemical species. Composite samples of weathered coal fly ash taken at various depths and fresh coal fly ash were examined using organic petrographic, X-ray diffraction, X-ray fluorescence techniques, and successive extraction procedures. Results obtained show relative enrichment of glass, Al–Fe-oxides, calcite, and tridymite in the weathered CFA, but the fresh CFA is enriched in mullite, inertinite, maghemite, and ettringite. The enrichment of the weathered CFA in amorphous glass suggests higher reactivity when compared to fresh CFA. The evident depletion of soluble oxides in the weathered CFA is attributed to flushing of the soluble salts by percolating rainwater. Comparative enrichment of examined elements in water-soluble, exchangeable, reducible, and residual fractions of the weathered CFA is partly due to the slow release of adsorbed chemical species from the alumina-silicate matrix and diffusion from the deeper sections of the particles of coal fly ash. Sodium and potassium show enrichment in the oxidisable fraction of fresh CFA. The estimated mobility factor indicates mobility for Ca, Mg, Na, Se, Mo, and Sb and K, Sr, V, Cu, Cr, Se, and B in fresh and weathered CFAs, respectively.
publishDate 2020
dc.date.accessioned.none.fl_str_mv 2020-01-14T19:25:13Z
dc.date.available.none.fl_str_mv 2020-01-14T19:25:13Z
dc.date.issued.none.fl_str_mv 2020-01-03
dc.type.spa.fl_str_mv Pre-Publicación
dc.type.coar.spa.fl_str_mv http://purl.org/coar/resource_type/c_816b
dc.type.content.spa.fl_str_mv Text
dc.type.driver.spa.fl_str_mv info:eu-repo/semantics/preprint
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dc.type.version.spa.fl_str_mv info:eu-repo/semantics/acceptedVersion
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status_str acceptedVersion
dc.identifier.uri.spa.fl_str_mv https://hdl.handle.net/11323/5817
dc.identifier.instname.spa.fl_str_mv Corporación Universidad de la Costa
dc.identifier.reponame.spa.fl_str_mv REDICUC - Repositorio CUC
dc.identifier.repourl.spa.fl_str_mv https://repositorio.cuc.edu.co/
url https://hdl.handle.net/11323/5817
https://repositorio.cuc.edu.co/
identifier_str_mv Corporación Universidad de la Costa
REDICUC - Repositorio CUC
dc.language.iso.none.fl_str_mv eng
language eng
dc.rights.spa.fl_str_mv CC0 1.0 Universal
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http://creativecommons.org/publicdomain/zero/1.0/
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eu_rights_str_mv openAccess
dc.publisher.spa.fl_str_mv Universidad de la Costa
institution Corporación Universidad de la Costa
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spelling Akinyemi, S. A.Gitari, W. M.Thobakgale, R.Petrik, L. F.Nyakuma, B. B.Hower, J. C.Ward, C. R.Silva, Marcos LeandroSilva Oliveira, Luis Felipe2020-01-14T19:25:13Z2020-01-14T19:25:13Z2020-01-03https://hdl.handle.net/11323/5817Corporación Universidad de la CostaREDICUC - Repositorio CUChttps://repositorio.cuc.edu.co/The chemical reactions of dry-disposed ash dump, ingressed oxygen, carbon dioxide, and infiltrating rainwater affect mineralogical transformation, redistribution, and migration of chemical species. Composite samples of weathered coal fly ash taken at various depths and fresh coal fly ash were examined using organic petrographic, X-ray diffraction, X-ray fluorescence techniques, and successive extraction procedures. Results obtained show relative enrichment of glass, Al–Fe-oxides, calcite, and tridymite in the weathered CFA, but the fresh CFA is enriched in mullite, inertinite, maghemite, and ettringite. The enrichment of the weathered CFA in amorphous glass suggests higher reactivity when compared to fresh CFA. The evident depletion of soluble oxides in the weathered CFA is attributed to flushing of the soluble salts by percolating rainwater. Comparative enrichment of examined elements in water-soluble, exchangeable, reducible, and residual fractions of the weathered CFA is partly due to the slow release of adsorbed chemical species from the alumina-silicate matrix and diffusion from the deeper sections of the particles of coal fly ash. Sodium and potassium show enrichment in the oxidisable fraction of fresh CFA. The estimated mobility factor indicates mobility for Ca, Mg, Na, Se, Mo, and Sb and K, Sr, V, Cu, Cr, Se, and B in fresh and weathered CFAs, respectively.Akinyemi, S. A.Gitari, W. M.Thobakgale, R.Petrik, L. F.Nyakuma, B. B.Hower, J. C.Ward, C. R.Silva, Marcos Leandro-will be generated-orcid-0000-0001-6044-8737-600Silva Oliveira, Luis FelipeengUniversidad de la CostaCC0 1.0 Universalhttp://creativecommons.org/publicdomain/zero/1.0/info:eu-repo/semantics/openAccesshttp://purl.org/coar/access_right/c_abf2Weathered ashFresh ashOrganic petrographySequential extractionMetal mobilityMineral transformationsGeochemical fractionation of hazardous elements in fresh and drilled weathered South African coal fly ashesPre-Publicaciónhttp://purl.org/coar/resource_type/c_816bTextinfo:eu-repo/semantics/preprinthttp://purl.org/redcol/resource_type/ARTOTRinfo:eu-repo/semantics/acceptedVersionPublicationCC-LICENSElicense_rdflicense_rdfapplication/rdf+xml; charset=utf-8701https://repositorio.cuc.edu.co/bitstreams/40beb1aa-0322-423a-bc28-a701431e7d72/download42fd4ad1e89814f5e4a476b409eb708cMD52LICENSElicense.txtlicense.txttext/plain; charset=utf-81748https://repositorio.cuc.edu.co/bitstreams/e2aeb0b9-a21d-4b47-b31d-4f3c39e7fe4b/download8a4605be74aa9ea9d79846c1fba20a33MD53ORIGINALGeochemical fractionation of hazardous elements in fresh and drilled weathered South African coal fly ashes.pdfGeochemical fractionation of hazardous elements in fresh and drilled weathered South African coal fly ashes.pdfapplication/pdf245712https://repositorio.cuc.edu.co/bitstreams/ee383d3a-bb92-4274-8a26-f0061380ea0f/downloadefe6493d4779a6bb4822f279a1af19a2MD51THUMBNAILGeochemical fractionation of hazardous elements in fresh and drilled weathered South African coal fly ashes.pdf.jpgGeochemical fractionation of hazardous elements in fresh and drilled weathered South African coal fly ashes.pdf.jpgimage/jpeg51453https://repositorio.cuc.edu.co/bitstreams/125299cd-cd8b-4223-8622-1a70a02fe803/downloade48fdb378d46785b5a641fd519804b81MD55TEXTGeochemical fractionation of hazardous elements in fresh and drilled weathered South African coal fly ashes.pdf.txtGeochemical fractionation of hazardous elements in fresh and drilled weathered South African coal fly ashes.pdf.txttext/plain1788https://repositorio.cuc.edu.co/bitstreams/a8e233bb-e369-4c58-879b-b1167367b4f3/downloadd9db4502bc891ed6dfdb78185c9eecc6MD5611323/5817oai:repositorio.cuc.edu.co:11323/58172024-09-17 10:55:30.058http://creativecommons.org/publicdomain/zero/1.0/CC0 1.0 Universalopen.accesshttps://repositorio.cuc.edu.coRepositorio de la Universidad de la Costa CUCrepdigital@cuc.edu.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