Effect of pretreatment prior to leaching on a chalcopyrite mineral in acid media using NaCl and KNO3

Chalcopyrite is the most abundant copper ore mined in Chile. Hydrometallurgical plants are currently changing to concentration by flotation-matte smelting deposits when oxide minerals run out and chalcopyrite appears in deposits. The change from hydrometallurgical processing to flotation is mainly d...

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Autores: Quezada Reyes, Víctor Alejandro, Roca, Antoni (Roca Vallmajor), Benavente, Oscar, Cruells Cadevall, Montserrat, Keith, Brian, Melo, Evelyn
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2020
País:España
Institución:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/181521
Acceso en línea:https://hdl.handle.net/2445/181521
Access Level:acceso abierto
Palabra clave:Clorurs
Nitrats
Calcopirita
Chlorides
Nitrates
Chalcopyrite
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spelling Effect of pretreatment prior to leaching on a chalcopyrite mineral in acid media using NaCl and KNO3Quezada Reyes, Víctor AlejandroRoca, Antoni (Roca Vallmajor)Benavente, OscarCruells Cadevall, MontserratKeith, BrianMelo, EvelynClorursNitratsCalcopiritaChloridesNitratesChalcopyriteChalcopyrite is the most abundant copper ore mined in Chile. Hydrometallurgical plants are currently changing to concentration by flotation-matte smelting deposits when oxide minerals run out and chalcopyrite appears in deposits. The change from hydrometallurgical processing to flotation is mainly dependent on whether comminution costs can be absorbed given the copper grade. It is important to develop alternative technologies to work profitably with low-grade copper sulphide ores. One alternative that has been recently studied is the pretreatment of low copper grade sulphide minerals, especially chalcopyrite, to improve leaching efficiency. The curing time, as pretreatment, improves dissolution kinetics and shortens leaching time. This study used a pure sample of chalcopyrite mineral with 28.5% copper. Chalcanthite (copper sulphate) represented 9% of total copper in the sample. The effect of curing time as a function of copper extraction prior to leaching was evaluated using different concentrations of sodium chloride (NaCl), potassium nitrate (KNO3) and sulphuric acid (H2SO4). A 23% copper dissolution was obtained prior to leaching using 25 kg/t NaCl, 15 kg/t H2SO4 and 15 days of curing time. The ANOVA analysis reported that curing time was the most important variable (56.4 and 54.7% of contribution) in tests with NaCl and KNO3. According to the results, KNO3 does not have a significant effect on copper extraction prior to leaching.Elsevier2020info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/181521Articles publicats en revistes (Ciència dels Materials i Química Física)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésReproducció del document publicat a: https://doi.org/10.1016/j.jmrt.2020.07.055Journal of Materials Research and Technology, 2020, vol. 9, num. 5, p. 10316-10324https://doi.org/10.1016/j.jmrt.2020.07.055cc-by (c) Quezada Reyes, Víctor Alejandro et al., 2020https://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/1815212026-05-27T06:46:51Z
dc.title.none.fl_str_mv Effect of pretreatment prior to leaching on a chalcopyrite mineral in acid media using NaCl and KNO3
title Effect of pretreatment prior to leaching on a chalcopyrite mineral in acid media using NaCl and KNO3
spellingShingle Effect of pretreatment prior to leaching on a chalcopyrite mineral in acid media using NaCl and KNO3
Quezada Reyes, Víctor Alejandro
Clorurs
Nitrats
Calcopirita
Chlorides
Nitrates
Chalcopyrite
title_short Effect of pretreatment prior to leaching on a chalcopyrite mineral in acid media using NaCl and KNO3
title_full Effect of pretreatment prior to leaching on a chalcopyrite mineral in acid media using NaCl and KNO3
title_fullStr Effect of pretreatment prior to leaching on a chalcopyrite mineral in acid media using NaCl and KNO3
title_full_unstemmed Effect of pretreatment prior to leaching on a chalcopyrite mineral in acid media using NaCl and KNO3
title_sort Effect of pretreatment prior to leaching on a chalcopyrite mineral in acid media using NaCl and KNO3
dc.creator.none.fl_str_mv Quezada Reyes, Víctor Alejandro
Roca, Antoni (Roca Vallmajor)
Benavente, Oscar
Cruells Cadevall, Montserrat
Keith, Brian
Melo, Evelyn
author Quezada Reyes, Víctor Alejandro
author_facet Quezada Reyes, Víctor Alejandro
Roca, Antoni (Roca Vallmajor)
Benavente, Oscar
Cruells Cadevall, Montserrat
Keith, Brian
Melo, Evelyn
author_role author
author2 Roca, Antoni (Roca Vallmajor)
Benavente, Oscar
Cruells Cadevall, Montserrat
Keith, Brian
Melo, Evelyn
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Clorurs
Nitrats
Calcopirita
Chlorides
Nitrates
Chalcopyrite
topic Clorurs
Nitrats
Calcopirita
Chlorides
Nitrates
Chalcopyrite
description Chalcopyrite is the most abundant copper ore mined in Chile. Hydrometallurgical plants are currently changing to concentration by flotation-matte smelting deposits when oxide minerals run out and chalcopyrite appears in deposits. The change from hydrometallurgical processing to flotation is mainly dependent on whether comminution costs can be absorbed given the copper grade. It is important to develop alternative technologies to work profitably with low-grade copper sulphide ores. One alternative that has been recently studied is the pretreatment of low copper grade sulphide minerals, especially chalcopyrite, to improve leaching efficiency. The curing time, as pretreatment, improves dissolution kinetics and shortens leaching time. This study used a pure sample of chalcopyrite mineral with 28.5% copper. Chalcanthite (copper sulphate) represented 9% of total copper in the sample. The effect of curing time as a function of copper extraction prior to leaching was evaluated using different concentrations of sodium chloride (NaCl), potassium nitrate (KNO3) and sulphuric acid (H2SO4). A 23% copper dissolution was obtained prior to leaching using 25 kg/t NaCl, 15 kg/t H2SO4 and 15 days of curing time. The ANOVA analysis reported that curing time was the most important variable (56.4 and 54.7% of contribution) in tests with NaCl and KNO3. According to the results, KNO3 does not have a significant effect on copper extraction prior to leaching.
publishDate 2020
dc.date.none.fl_str_mv 2020
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/181521
url https://hdl.handle.net/2445/181521
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a: https://doi.org/10.1016/j.jmrt.2020.07.055
Journal of Materials Research and Technology, 2020, vol. 9, num. 5, p. 10316-10324
https://doi.org/10.1016/j.jmrt.2020.07.055
dc.rights.none.fl_str_mv cc-by (c) Quezada Reyes, Víctor Alejandro et al., 2020
https://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv cc-by (c) Quezada Reyes, Víctor Alejandro et al., 2020
https://creativecommons.org/licenses/by/4.0/
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 Articles publicats en revistes (Ciència dels Materials i Química Física)
reponame:Dipòsit Digital de la UB
instname:Universidad de Barcelona
instname_str Universidad de Barcelona
reponame_str Dipòsit Digital de la UB
collection Dipòsit Digital de la UB
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,300719

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