Phase transformations of a talc ore under heated chlorine atmosphere

Autores
Orosco, Roberto Pablo; Ruiz Salado, Maria del Carmen; Gonzalez, Jorge Alberto
Año de publicación
2013
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The effect of Cl2 on the phase transformations of the minerals present in a talc (Mg3Si4O10(OH)2) unpurified with clinochlore (Mg5Al2Si3O10(OH)8), magnesite (MgCO3), dolomite (MgCa(CO3)2), hematite (Fe2O3) and pyrite (FeS2) was studied with the purpose of deferricating the mineral and obtaining protoenstatite (MgSiO3), which is the basic component of steatite ceramics. Isothermal and non-isothermal assays in N2 and Cl2–N2 atmospheres were performed using a thermogravimetric device at temperatures between 600 and 980 °C. The reagents and the products were analyzed by differential thermal analysis (DTA), X-ray diffraction (XRD), X-ray fluorescence (XRF), scanning electron microscopy (SEM), and electron probe microanalysis (EPMA). Results obtained showed that the following phenomena were produced in Cl2: (a) The transformation of vitreous silica (SiO2), from the chlorination reaction of talc, into enstatite (MgSiO3) started at about 700 °C, being dolomite the mineral that favored this reaction. At 800 °C, more enstatite was formed as a result of the reaction between vitreous silica not transformed, MgCl2 and O2 derived from the chlorination of dolomite and magnesite; then, polymorphic transformation of enstatite into protoenstatite was produced. (b) At about 950 °C, CaCl2 produced as a result of dolomite chlorination led to the destruction of the protoenstatite structure, and to the subsequent formation of cristobalite, with release of O2 and gaseous MgCl2. (c) The elimination of iron as FeCl3(g) takes place in all the temperature interval investigated. The most favorable chlorination temperature was 900 °C, since protoenstatite structure was destroyed at higher temperatures and an efficient elimination of iron present in the talc sample was not possible at lower temperatures.
Fil: Orosco, Roberto Pablo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico San Luis. Instituto de Investigaciones en Tecnología Química; Argentina
Fil: Ruiz Salado, Maria del Carmen. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico San Luis. Instituto de Investigaciones en Tecnología Química; Argentina. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia; Argentina
Fil: Gonzalez, Jorge Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico San Luis. Instituto de Investigaciones en Tecnología Química; Argentina. Universidad Nacional de Cuyo; Argentina
Materia
CHLORINATION
PROTOENSTATITE
TALC
THERMOGRAVIMETRY
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/2207
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/2207
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Phase transformations of a talc ore under heated chlorine atmosphereOrosco, Roberto PabloRuiz Salado, Maria del CarmenGonzalez, Jorge AlbertoCHLORINATIONPROTOENSTATITETALCTHERMOGRAVIMETRYhttps://purl.org/becyt/ford/2.4https://purl.org/becyt/ford/2The effect of Cl2 on the phase transformations of the minerals present in a talc (Mg3Si4O10(OH)2) unpurified with clinochlore (Mg5Al2Si3O10(OH)8), magnesite (MgCO3), dolomite (MgCa(CO3)2), hematite (Fe2O3) and pyrite (FeS2) was studied with the purpose of deferricating the mineral and obtaining protoenstatite (MgSiO3), which is the basic component of steatite ceramics. Isothermal and non-isothermal assays in N2 and Cl2–N2 atmospheres were performed using a thermogravimetric device at temperatures between 600 and 980 °C. The reagents and the products were analyzed by differential thermal analysis (DTA), X-ray diffraction (XRD), X-ray fluorescence (XRF), scanning electron microscopy (SEM), and electron probe microanalysis (EPMA). Results obtained showed that the following phenomena were produced in Cl2: (a) The transformation of vitreous silica (SiO2), from the chlorination reaction of talc, into enstatite (MgSiO3) started at about 700 °C, being dolomite the mineral that favored this reaction. At 800 °C, more enstatite was formed as a result of the reaction between vitreous silica not transformed, MgCl2 and O2 derived from the chlorination of dolomite and magnesite; then, polymorphic transformation of enstatite into protoenstatite was produced. (b) At about 950 °C, CaCl2 produced as a result of dolomite chlorination led to the destruction of the protoenstatite structure, and to the subsequent formation of cristobalite, with release of O2 and gaseous MgCl2. (c) The elimination of iron as FeCl3(g) takes place in all the temperature interval investigated. The most favorable chlorination temperature was 900 °C, since protoenstatite structure was destroyed at higher temperatures and an efficient elimination of iron present in the talc sample was not possible at lower temperatures.Fil: Orosco, Roberto Pablo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico San Luis. Instituto de Investigaciones en Tecnología Química; ArgentinaFil: Ruiz Salado, Maria del Carmen. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico San Luis. Instituto de Investigaciones en Tecnología Química; Argentina. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia; ArgentinaFil: Gonzalez, Jorge Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico San Luis. Instituto de Investigaciones en Tecnología Química; Argentina. Universidad Nacional de Cuyo; ArgentinaElsevier Science2013-02-20info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/2207Orosco, Roberto Pablo; Ruiz Salado, Maria del Carmen; Gonzalez, Jorge Alberto; Phase transformations of a talc ore under heated chlorine atmosphere; Elsevier Science; Thermochimica Acta; 554; 20-2-2013; 15-240040-6031enginfo:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0040603112005631info:eu-repo/semantics/altIdentifier/doi/10.1016/j.tca.2012.11.029info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-nd/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:11:58Zoai:ri.conicet.gov.ar:11336/2207instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:11:58.238CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Phase transformations of a talc ore under heated chlorine atmosphere
title Phase transformations of a talc ore under heated chlorine atmosphere
spellingShingle Phase transformations of a talc ore under heated chlorine atmosphere
Orosco, Roberto Pablo
CHLORINATION
PROTOENSTATITE
TALC
THERMOGRAVIMETRY
title_short Phase transformations of a talc ore under heated chlorine atmosphere
title_full Phase transformations of a talc ore under heated chlorine atmosphere
title_fullStr Phase transformations of a talc ore under heated chlorine atmosphere
title_full_unstemmed Phase transformations of a talc ore under heated chlorine atmosphere
title_sort Phase transformations of a talc ore under heated chlorine atmosphere
dc.creator.none.fl_str_mv Orosco, Roberto Pablo
Ruiz Salado, Maria del Carmen
Gonzalez, Jorge Alberto
author Orosco, Roberto Pablo
author_facet Orosco, Roberto Pablo
Ruiz Salado, Maria del Carmen
Gonzalez, Jorge Alberto
author_role author
author2 Ruiz Salado, Maria del Carmen
Gonzalez, Jorge Alberto
author2_role author
author
dc.subject.none.fl_str_mv CHLORINATION
PROTOENSTATITE
TALC
THERMOGRAVIMETRY
topic CHLORINATION
PROTOENSTATITE
TALC
THERMOGRAVIMETRY
purl_subject.fl_str_mv https://purl.org/becyt/ford/2.4
https://purl.org/becyt/ford/2
dc.description.none.fl_txt_mv The effect of Cl2 on the phase transformations of the minerals present in a talc (Mg3Si4O10(OH)2) unpurified with clinochlore (Mg5Al2Si3O10(OH)8), magnesite (MgCO3), dolomite (MgCa(CO3)2), hematite (Fe2O3) and pyrite (FeS2) was studied with the purpose of deferricating the mineral and obtaining protoenstatite (MgSiO3), which is the basic component of steatite ceramics. Isothermal and non-isothermal assays in N2 and Cl2–N2 atmospheres were performed using a thermogravimetric device at temperatures between 600 and 980 °C. The reagents and the products were analyzed by differential thermal analysis (DTA), X-ray diffraction (XRD), X-ray fluorescence (XRF), scanning electron microscopy (SEM), and electron probe microanalysis (EPMA). Results obtained showed that the following phenomena were produced in Cl2: (a) The transformation of vitreous silica (SiO2), from the chlorination reaction of talc, into enstatite (MgSiO3) started at about 700 °C, being dolomite the mineral that favored this reaction. At 800 °C, more enstatite was formed as a result of the reaction between vitreous silica not transformed, MgCl2 and O2 derived from the chlorination of dolomite and magnesite; then, polymorphic transformation of enstatite into protoenstatite was produced. (b) At about 950 °C, CaCl2 produced as a result of dolomite chlorination led to the destruction of the protoenstatite structure, and to the subsequent formation of cristobalite, with release of O2 and gaseous MgCl2. (c) The elimination of iron as FeCl3(g) takes place in all the temperature interval investigated. The most favorable chlorination temperature was 900 °C, since protoenstatite structure was destroyed at higher temperatures and an efficient elimination of iron present in the talc sample was not possible at lower temperatures.
Fil: Orosco, Roberto Pablo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico San Luis. Instituto de Investigaciones en Tecnología Química; Argentina
Fil: Ruiz Salado, Maria del Carmen. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico San Luis. Instituto de Investigaciones en Tecnología Química; Argentina. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia; Argentina
Fil: Gonzalez, Jorge Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico San Luis. Instituto de Investigaciones en Tecnología Química; Argentina. Universidad Nacional de Cuyo; Argentina
description The effect of Cl2 on the phase transformations of the minerals present in a talc (Mg3Si4O10(OH)2) unpurified with clinochlore (Mg5Al2Si3O10(OH)8), magnesite (MgCO3), dolomite (MgCa(CO3)2), hematite (Fe2O3) and pyrite (FeS2) was studied with the purpose of deferricating the mineral and obtaining protoenstatite (MgSiO3), which is the basic component of steatite ceramics. Isothermal and non-isothermal assays in N2 and Cl2–N2 atmospheres were performed using a thermogravimetric device at temperatures between 600 and 980 °C. The reagents and the products were analyzed by differential thermal analysis (DTA), X-ray diffraction (XRD), X-ray fluorescence (XRF), scanning electron microscopy (SEM), and electron probe microanalysis (EPMA). Results obtained showed that the following phenomena were produced in Cl2: (a) The transformation of vitreous silica (SiO2), from the chlorination reaction of talc, into enstatite (MgSiO3) started at about 700 °C, being dolomite the mineral that favored this reaction. At 800 °C, more enstatite was formed as a result of the reaction between vitreous silica not transformed, MgCl2 and O2 derived from the chlorination of dolomite and magnesite; then, polymorphic transformation of enstatite into protoenstatite was produced. (b) At about 950 °C, CaCl2 produced as a result of dolomite chlorination led to the destruction of the protoenstatite structure, and to the subsequent formation of cristobalite, with release of O2 and gaseous MgCl2. (c) The elimination of iron as FeCl3(g) takes place in all the temperature interval investigated. The most favorable chlorination temperature was 900 °C, since protoenstatite structure was destroyed at higher temperatures and an efficient elimination of iron present in the talc sample was not possible at lower temperatures.
publishDate 2013
dc.date.none.fl_str_mv 2013-02-20
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/2207
Orosco, Roberto Pablo; Ruiz Salado, Maria del Carmen; Gonzalez, Jorge Alberto; Phase transformations of a talc ore under heated chlorine atmosphere; Elsevier Science; Thermochimica Acta; 554; 20-2-2013; 15-24
0040-6031
url http://hdl.handle.net/11336/2207
identifier_str_mv Orosco, Roberto Pablo; Ruiz Salado, Maria del Carmen; Gonzalez, Jorge Alberto; Phase transformations of a talc ore under heated chlorine atmosphere; Elsevier Science; Thermochimica Acta; 554; 20-2-2013; 15-24
0040-6031
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0040603112005631
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.tca.2012.11.029
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier Science
publisher.none.fl_str_mv Elsevier Science
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.070432

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