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...
- 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
id |
RCUC2_818427ff552cb71b502423de8f50fbe4 |
---|---|
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 |
dc.type.redcol.spa.fl_str_mv |
http://purl.org/redcol/resource_type/ARTOTR |
dc.type.version.spa.fl_str_mv |
info:eu-repo/semantics/acceptedVersion |
format |
http://purl.org/coar/resource_type/c_816b |
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 |
dc.rights.uri.spa.fl_str_mv |
http://creativecommons.org/publicdomain/zero/1.0/ |
dc.rights.accessrights.spa.fl_str_mv |
info:eu-repo/semantics/openAccess |
dc.rights.coar.spa.fl_str_mv |
http://purl.org/coar/access_right/c_abf2 |
rights_invalid_str_mv |
CC0 1.0 Universal http://creativecommons.org/publicdomain/zero/1.0/ http://purl.org/coar/access_right/c_abf2 |
eu_rights_str_mv |
openAccess |
dc.publisher.spa.fl_str_mv |
Universidad de la Costa |
institution |
Corporación Universidad de la Costa |
bitstream.url.fl_str_mv |
https://repositorio.cuc.edu.co/bitstreams/40beb1aa-0322-423a-bc28-a701431e7d72/download https://repositorio.cuc.edu.co/bitstreams/e2aeb0b9-a21d-4b47-b31d-4f3c39e7fe4b/download https://repositorio.cuc.edu.co/bitstreams/ee383d3a-bb92-4274-8a26-f0061380ea0f/download https://repositorio.cuc.edu.co/bitstreams/125299cd-cd8b-4223-8622-1a70a02fe803/download https://repositorio.cuc.edu.co/bitstreams/a8e233bb-e369-4c58-879b-b1167367b4f3/download |
bitstream.checksum.fl_str_mv |
42fd4ad1e89814f5e4a476b409eb708c 8a4605be74aa9ea9d79846c1fba20a33 efe6493d4779a6bb4822f279a1af19a2 e48fdb378d46785b5a641fd519804b81 d9db4502bc891ed6dfdb78185c9eecc6 |
bitstream.checksumAlgorithm.fl_str_mv |
MD5 MD5 MD5 MD5 MD5 |
repository.name.fl_str_mv |
Repositorio de la Universidad de la Costa CUC |
repository.mail.fl_str_mv |
repdigital@cuc.edu.co |
_version_ |
1811760742422020096 |
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.coTk9URTogUExBQ0UgWU9VUiBPV04gTElDRU5TRSBIRVJFClRoaXMgc2FtcGxlIGxpY2Vuc2UgaXMgcHJvdmlkZWQgZm9yIGluZm9ybWF0aW9uYWwgcHVycG9zZXMgb25seS4KCk5PTi1FWENMVVNJVkUgRElTVFJJQlVUSU9OIExJQ0VOU0UKCkJ5IHNpZ25pbmcgYW5kIHN1Ym1pdHRpbmcgdGhpcyBsaWNlbnNlLCB5b3UgKHRoZSBhdXRob3Iocykgb3IgY29weXJpZ2h0Cm93bmVyKSBncmFudHMgdG8gRFNwYWNlIFVuaXZlcnNpdHkgKERTVSkgdGhlIG5vbi1leGNsdXNpdmUgcmlnaHQgdG8gcmVwcm9kdWNlLAp0cmFuc2xhdGUgKGFzIGRlZmluZWQgYmVsb3cpLCBhbmQvb3IgZGlzdHJpYnV0ZSB5b3VyIHN1Ym1pc3Npb24gKGluY2x1ZGluZwp0aGUgYWJzdHJhY3QpIHdvcmxkd2lkZSBpbiBwcmludCBhbmQgZWxlY3Ryb25pYyBmb3JtYXQgYW5kIGluIGFueSBtZWRpdW0sCmluY2x1ZGluZyBidXQgbm90IGxpbWl0ZWQgdG8gYXVkaW8gb3IgdmlkZW8uCgpZb3UgYWdyZWUgdGhhdCBEU1UgbWF5LCB3aXRob3V0IGNoYW5naW5nIHRoZSBjb250ZW50LCB0cmFuc2xhdGUgdGhlCnN1Ym1pc3Npb24gdG8gYW55IG1lZGl1bSBvciBmb3JtYXQgZm9yIHRoZSBwdXJwb3NlIG9mIHByZXNlcnZhdGlvbi4KCllvdSBhbHNvIGFncmVlIHRoYXQgRFNVIG1heSBrZWVwIG1vcmUgdGhhbiBvbmUgY29weSBvZiB0aGlzIHN1Ym1pc3Npb24gZm9yCnB1cnBvc2VzIG9mIHNlY3VyaXR5LCBiYWNrLXVwIGFuZCBwcmVzZXJ2YXRpb24uCgpZb3UgcmVwcmVzZW50IHRoYXQgdGhlIHN1Ym1pc3Npb24gaXMgeW91ciBvcmlnaW5hbCB3b3JrLCBhbmQgdGhhdCB5b3UgaGF2ZQp0aGUgcmlnaHQgdG8gZ3JhbnQgdGhlIHJpZ2h0cyBjb250YWluZWQgaW4gdGhpcyBsaWNlbnNlLiBZb3UgYWxzbyByZXByZXNlbnQKdGhhdCB5b3VyIHN1Ym1pc3Npb24gZG9lcyBub3QsIHRvIHRoZSBiZXN0IG9mIHlvdXIga25vd2xlZGdlLCBpbmZyaW5nZSB1cG9uCmFueW9uZSdzIGNvcHlyaWdodC4KCklmIHRoZSBzdWJtaXNzaW9uIGNvbnRhaW5zIG1hdGVyaWFsIGZvciB3aGljaCB5b3UgZG8gbm90IGhvbGQgY29weXJpZ2h0LAp5b3UgcmVwcmVzZW50IHRoYXQgeW91IGhhdmUgb2J0YWluZWQgdGhlIHVucmVzdHJpY3RlZCBwZXJtaXNzaW9uIG9mIHRoZQpjb3B5cmlnaHQgb3duZXIgdG8gZ3JhbnQgRFNVIHRoZSByaWdodHMgcmVxdWlyZWQgYnkgdGhpcyBsaWNlbnNlLCBhbmQgdGhhdApzdWNoIHRoaXJkLXBhcnR5IG93bmVkIG1hdGVyaWFsIGlzIGNsZWFybHkgaWRlbnRpZmllZCBhbmQgYWNrbm93bGVkZ2VkCndpdGhpbiB0aGUgdGV4dCBvciBjb250ZW50IG9mIHRoZSBzdWJtaXNzaW9uLgoKSUYgVEhFIFNVQk1JU1NJT04gSVMgQkFTRUQgVVBPTiBXT1JLIFRIQVQgSEFTIEJFRU4gU1BPTlNPUkVEIE9SIFNVUFBPUlRFRApCWSBBTiBBR0VOQ1kgT1IgT1JHQU5JWkFUSU9OIE9USEVSIFRIQU4gRFNVLCBZT1UgUkVQUkVTRU5UIFRIQVQgWU9VIEhBVkUKRlVMRklMTEVEIEFOWSBSSUdIVCBPRiBSRVZJRVcgT1IgT1RIRVIgT0JMSUdBVElPTlMgUkVRVUlSRUQgQlkgU1VDSApDT05UUkFDVCBPUiBBR1JFRU1FTlQuCgpEU1Ugd2lsbCBjbGVhcmx5IGlkZW50aWZ5IHlvdXIgbmFtZShzKSBhcyB0aGUgYXV0aG9yKHMpIG9yIG93bmVyKHMpIG9mIHRoZQpzdWJtaXNzaW9uLCBhbmQgd2lsbCBub3QgbWFrZSBhbnkgYWx0ZXJhdGlvbiwgb3RoZXIgdGhhbiBhcyBhbGxvd2VkIGJ5IHRoaXMKbGljZW5zZSwgdG8geW91ciBzdWJtaXNzaW9uLgo= |