Stabilization methods for the treatment of weathered arsenopyrite mine wastes: Arsenic immobilization under selective leaching conditions

[EN]The release of arsenic from weathered arsenopyrite mine wastes represents a grave environmental issue, especially when dealing with former mining areas. The evaluation and development of measures to manage this type of wastes in a sustainable and economic way are required. In this study differen...

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Detalles Bibliográficos
Autores: Álvarez Ayuso, Esther, Murciego Murciego, Ascensión
Tipo de recurso: artículo
Estado:Versión borrador
Fecha de publicación:2021
País:España
Institución:Universidad de Salamanca (USAL)
Repositorio:GREDOS. Repositorio Institucional de la Universidad de Salamanca
OAI Identifier:oai:gredos.usal.es:10366/154475
Acceso en línea:http://hdl.handle.net/10366/154475
Access Level:acceso abierto
Palabra clave:Mine wastes
Arsenic
Stabilization
Calcite
Ferric sulfate
Aluminum salt slags
2506 Geología
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spelling Stabilization methods for the treatment of weathered arsenopyrite mine wastes: Arsenic immobilization under selective leaching conditionsÁlvarez Ayuso, EstherMurciego Murciego, AscensiónMine wastesArsenicStabilizationCalciteFerric sulfateAluminum salt slags2506 Geología[EN]The release of arsenic from weathered arsenopyrite mine wastes represents a grave environmental issue, especially when dealing with former mining areas. The evaluation and development of measures to manage this type of wastes in a sustainable and economic way are required. In this study different methods based on the application of chemical amendments were assessed as stabilization systems. For this purpose, weathered arsenopyrite mine wastes with the occurrence of amorphous ferric arsenates (AFA)/scorodite as main secondary products, as determined by X-ray diffraction (XRD) and polarizing microscopy, were used. Stabilization studies were performed employing two different amendments applied at diverse doses, namely a combination of calcite and ferric sulfate (CC + Fe(III) salt) and a by-product generated from the processing of aluminum salt slags (BP-AlOx). The efficacy of such treatments was assessed using both batch and column leaching essays. Under the equilibrium conditions imposed by the applied standard batch leaching tests, both of the treatments at their optimal conditions attained important reductions in the leachable As concentrations (95–98% and 52–79%, respectively), making mine wastes acceptable at controlled landfills as established by international legislation. Nevertheless, under flow leaching conditions the treatment employing CC + Fe(III) salt was shown not to be an appropriate long-term stabilization method. Conversely, the treatment with BP-AlOx proved to be more perdurable, decreasing considerably the As release (>50%) under prolonged leaching conditions. This stabilization system allowed simultaneously an important transformation of AFA to scorodite. Additionally, it partially neutralized the acidity generated from mine wastes without exceeding the pH values above which the solubilization of scorodite could be enhanced importantly.Elsevier202420242021info:eu-repo/semantics/articleinfo:eu-repo/semantics/draftapplication/pdfhttp://hdl.handle.net/10366/154475reponame:GREDOS. Repositorio Institucional de la Universidad de Salamancainstname:Universidad de Salamanca (USAL)Inglésinfo:eu-repo/semantics/openAccessoai:gredos.usal.es:10366/1544752026-06-07T06:28:51Z
dc.title.none.fl_str_mv Stabilization methods for the treatment of weathered arsenopyrite mine wastes: Arsenic immobilization under selective leaching conditions
title Stabilization methods for the treatment of weathered arsenopyrite mine wastes: Arsenic immobilization under selective leaching conditions
spellingShingle Stabilization methods for the treatment of weathered arsenopyrite mine wastes: Arsenic immobilization under selective leaching conditions
Álvarez Ayuso, Esther
Mine wastes
Arsenic
Stabilization
Calcite
Ferric sulfate
Aluminum salt slags
2506 Geología
title_short Stabilization methods for the treatment of weathered arsenopyrite mine wastes: Arsenic immobilization under selective leaching conditions
title_full Stabilization methods for the treatment of weathered arsenopyrite mine wastes: Arsenic immobilization under selective leaching conditions
title_fullStr Stabilization methods for the treatment of weathered arsenopyrite mine wastes: Arsenic immobilization under selective leaching conditions
title_full_unstemmed Stabilization methods for the treatment of weathered arsenopyrite mine wastes: Arsenic immobilization under selective leaching conditions
title_sort Stabilization methods for the treatment of weathered arsenopyrite mine wastes: Arsenic immobilization under selective leaching conditions
dc.creator.none.fl_str_mv Álvarez Ayuso, Esther
Murciego Murciego, Ascensión
author Álvarez Ayuso, Esther
author_facet Álvarez Ayuso, Esther
Murciego Murciego, Ascensión
author_role author
author2 Murciego Murciego, Ascensión
author2_role author
dc.subject.none.fl_str_mv Mine wastes
Arsenic
Stabilization
Calcite
Ferric sulfate
Aluminum salt slags
2506 Geología
topic Mine wastes
Arsenic
Stabilization
Calcite
Ferric sulfate
Aluminum salt slags
2506 Geología
description [EN]The release of arsenic from weathered arsenopyrite mine wastes represents a grave environmental issue, especially when dealing with former mining areas. The evaluation and development of measures to manage this type of wastes in a sustainable and economic way are required. In this study different methods based on the application of chemical amendments were assessed as stabilization systems. For this purpose, weathered arsenopyrite mine wastes with the occurrence of amorphous ferric arsenates (AFA)/scorodite as main secondary products, as determined by X-ray diffraction (XRD) and polarizing microscopy, were used. Stabilization studies were performed employing two different amendments applied at diverse doses, namely a combination of calcite and ferric sulfate (CC + Fe(III) salt) and a by-product generated from the processing of aluminum salt slags (BP-AlOx). The efficacy of such treatments was assessed using both batch and column leaching essays. Under the equilibrium conditions imposed by the applied standard batch leaching tests, both of the treatments at their optimal conditions attained important reductions in the leachable As concentrations (95–98% and 52–79%, respectively), making mine wastes acceptable at controlled landfills as established by international legislation. Nevertheless, under flow leaching conditions the treatment employing CC + Fe(III) salt was shown not to be an appropriate long-term stabilization method. Conversely, the treatment with BP-AlOx proved to be more perdurable, decreasing considerably the As release (>50%) under prolonged leaching conditions. This stabilization system allowed simultaneously an important transformation of AFA to scorodite. Additionally, it partially neutralized the acidity generated from mine wastes without exceeding the pH values above which the solubilization of scorodite could be enhanced importantly.
publishDate 2021
dc.date.none.fl_str_mv 2021
2024
2024
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/draft
format article
status_str draft
dc.identifier.none.fl_str_mv http://hdl.handle.net/10366/154475
url http://hdl.handle.net/10366/154475
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:GREDOS. Repositorio Institucional de la Universidad de Salamanca
instname:Universidad de Salamanca (USAL)
instname_str Universidad de Salamanca (USAL)
reponame_str GREDOS. Repositorio Institucional de la Universidad de Salamanca
collection GREDOS. Repositorio Institucional de la Universidad de Salamanca
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,300719

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