Ferric leaching of the sphalerite contained in a bulk concentrate: Kinetic study

A novel process for the integral treatment of polymetallic sulphide ores is proposed. The process consists of a global flotation, two stages of ferric leaching, the first stage dissolves the sphalerite and the rest of secondary sulphides, and the second dissolves the chalcopyrite with a silver catal...

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Autores: Lorenzo Tallafigo, Juan, Iglesias González, María Nieves, Romero Aleta, Rafael, Mazuelos Rojas, Alfonso, Carranza Mora, Francisco
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2018
País:España
Institución:Universidad de Sevilla (US)
Repositorio:idUS. Depósito de Investigación de la Universidad de Sevilla
OAI Identifier:oai:idus.us.es:11441/152801
Acceso en línea:https://hdl.handle.net/11441/152801
https://doi.org/10.1016/j.mineng.2018.05.026
Access Level:acceso abierto
Palabra clave:Ferric leaching
Kinetics
Sphalerite
Bulk concentrate
Polymetallic sulphide
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spelling Ferric leaching of the sphalerite contained in a bulk concentrate: Kinetic studyLorenzo Tallafigo, JuanIglesias González, María NievesRomero Aleta, RafaelMazuelos Rojas, AlfonsoCarranza Mora, FranciscoFerric leachingKineticsSphaleriteBulk concentratePolymetallic sulphideA novel process for the integral treatment of polymetallic sulphide ores is proposed. The process consists of a global flotation, two stages of ferric leaching, the first stage dissolves the sphalerite and the rest of secondary sulphides, and the second dissolves the chalcopyrite with a silver catalyst, and finally a brine leaching to recover lead and silver (added as catalyst). The proposed process offers several advantages comparing to traditional pyrometallurgical techniques. This study is focused on the sphalerite dissolution with ferric sulphate, as the first stage of the treatment of Cu-Zn-Pb concentrates. The ferric ion concentration, the temperature and the particle size have an important role in the sphalerite oxidation. However, the initial sulphuric acid, ferrous ion and sulphate ion concentrations have no influence in the process rate. The formation of an elemental non-porous layer of sulphur along the reaction hinders the ferric ion transport to the sphalerite surface. Two kinetics regimes are proposed, in the beginning the chemical reaction is the rate controlling step, and, at 30% Zn extraction, the rate controlling step changes to diffusion through a non-porous film of elemental sulphur. The activation energy obtained for the chemical reaction has a value of 51.3 kJ/mol, and the apparent activation energy in the diffusional stage is the 47.7 kJ/mol. The reaction order with respect ferric ion is 0.26 and the reaction rate is proportional to the zinc sulphide amount in the first stage. The behaviour of sphalerite, contained in a bulk concentrate, is similar to the pure sphalerite or the sphalerite contained in a differential concentrate.CLC Company - PRJ201602665/0124ElsevierIngeniería Química2018info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersionapplication/pdfapplication/pdfhttps://hdl.handle.net/11441/152801https://doi.org/10.1016/j.mineng.2018.05.026reponame:idUS. Depósito de Investigación de la Universidad de Sevillainstname:Universidad de Sevilla (US)InglésMinerals Engineering, 125, 50-59.CLC PRJ201602665/0124https://doi.org/10.1016/j.mineng.2018.05.026info:eu-repo/semantics/openAccessoai:idus.us.es:11441/1528012026-06-17T12:51:07Z
dc.title.none.fl_str_mv Ferric leaching of the sphalerite contained in a bulk concentrate: Kinetic study
title Ferric leaching of the sphalerite contained in a bulk concentrate: Kinetic study
spellingShingle Ferric leaching of the sphalerite contained in a bulk concentrate: Kinetic study
Lorenzo Tallafigo, Juan
Ferric leaching
Kinetics
Sphalerite
Bulk concentrate
Polymetallic sulphide
title_short Ferric leaching of the sphalerite contained in a bulk concentrate: Kinetic study
title_full Ferric leaching of the sphalerite contained in a bulk concentrate: Kinetic study
title_fullStr Ferric leaching of the sphalerite contained in a bulk concentrate: Kinetic study
title_full_unstemmed Ferric leaching of the sphalerite contained in a bulk concentrate: Kinetic study
title_sort Ferric leaching of the sphalerite contained in a bulk concentrate: Kinetic study
dc.creator.none.fl_str_mv Lorenzo Tallafigo, Juan
Iglesias González, María Nieves
Romero Aleta, Rafael
Mazuelos Rojas, Alfonso
Carranza Mora, Francisco
author Lorenzo Tallafigo, Juan
author_facet Lorenzo Tallafigo, Juan
Iglesias González, María Nieves
Romero Aleta, Rafael
Mazuelos Rojas, Alfonso
Carranza Mora, Francisco
author_role author
author2 Iglesias González, María Nieves
Romero Aleta, Rafael
Mazuelos Rojas, Alfonso
Carranza Mora, Francisco
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Ingeniería Química
dc.subject.none.fl_str_mv Ferric leaching
Kinetics
Sphalerite
Bulk concentrate
Polymetallic sulphide
topic Ferric leaching
Kinetics
Sphalerite
Bulk concentrate
Polymetallic sulphide
description A novel process for the integral treatment of polymetallic sulphide ores is proposed. The process consists of a global flotation, two stages of ferric leaching, the first stage dissolves the sphalerite and the rest of secondary sulphides, and the second dissolves the chalcopyrite with a silver catalyst, and finally a brine leaching to recover lead and silver (added as catalyst). The proposed process offers several advantages comparing to traditional pyrometallurgical techniques. This study is focused on the sphalerite dissolution with ferric sulphate, as the first stage of the treatment of Cu-Zn-Pb concentrates. The ferric ion concentration, the temperature and the particle size have an important role in the sphalerite oxidation. However, the initial sulphuric acid, ferrous ion and sulphate ion concentrations have no influence in the process rate. The formation of an elemental non-porous layer of sulphur along the reaction hinders the ferric ion transport to the sphalerite surface. Two kinetics regimes are proposed, in the beginning the chemical reaction is the rate controlling step, and, at 30% Zn extraction, the rate controlling step changes to diffusion through a non-porous film of elemental sulphur. The activation energy obtained for the chemical reaction has a value of 51.3 kJ/mol, and the apparent activation energy in the diffusional stage is the 47.7 kJ/mol. The reaction order with respect ferric ion is 0.26 and the reaction rate is proportional to the zinc sulphide amount in the first stage. The behaviour of sphalerite, contained in a bulk concentrate, is similar to the pure sphalerite or the sphalerite contained in a differential concentrate.
publishDate 2018
dc.date.none.fl_str_mv 2018
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/11441/152801
https://doi.org/10.1016/j.mineng.2018.05.026
url https://hdl.handle.net/11441/152801
https://doi.org/10.1016/j.mineng.2018.05.026
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Minerals Engineering, 125, 50-59.
CLC PRJ201602665/0124
https://doi.org/10.1016/j.mineng.2018.05.026
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:idUS. Depósito de Investigación de la Universidad de Sevilla
instname:Universidad de Sevilla (US)
instname_str Universidad de Sevilla (US)
reponame_str idUS. Depósito de Investigación de la Universidad de Sevilla
collection idUS. Depósito de Investigación de la Universidad de Sevilla
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,300719

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