Grinding Assistance in the Transformation of Gibbsite to Corundum
- Autores
- Torres Sánchez, Rosa María; Boix, A.; Mercader, Roberto Carlos
- Año de publicación
- 2002
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- After gibbsite was milled for 5 min in a Cr-steel oscillating mill, corundum was obtained by heating the powder for 3 h at 800 °C. We found that iron contamination, produced by the milling process, is essential to attain the transformation at this low temperature and is located at the surface of the gibbsite particles. The knowledge of the oxidation state and location of the contaminant elements, necessary to control the solid-state reactions and/or phase transformations induced by the milling, was realized in this work by a characterization performed by chemical analysis, x-ray photoelectron spectroscopy, Mossbauer spectroscopy, and isoelectric point determination. The iron contamination amounted to about 3% (as Fe₂O₃) for the sample milled for 60 min. That the iron contamination that occurred mainly on the gibbsite amorphous surface was concluded after a comparison of the isoelectric point determination of the milled samples with that of a mechanical mixture of gibbsite and hematite. X-ray diffraction studies showed that gibbsite looses its crystallinity after the first 5 min of milling.
Centro de Tecnología de Recursos Minerales y Cerámica
Instituto de Física La Plata - Materia
-
Química
Física
gibbsite
corundum
iron contamination - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- http://creativecommons.org/licenses/by/4.0/
- Repositorio
.jpg)
- Institución
- Universidad Nacional de La Plata
- OAI Identificador
- oai:sedici.unlp.edu.ar:10915/136992
Ver los metadatos del registro completo
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Grinding Assistance in the Transformation of Gibbsite to CorundumTorres Sánchez, Rosa MaríaBoix, A.Mercader, Roberto CarlosQuímicaFísicagibbsitecorundumiron contaminationAfter gibbsite was milled for 5 min in a Cr-steel oscillating mill, corundum was obtained by heating the powder for 3 h at 800 °C. We found that iron contamination, produced by the milling process, is essential to attain the transformation at this low temperature and is located at the surface of the gibbsite particles. The knowledge of the oxidation state and location of the contaminant elements, necessary to control the solid-state reactions and/or phase transformations induced by the milling, was realized in this work by a characterization performed by chemical analysis, x-ray photoelectron spectroscopy, Mossbauer spectroscopy, and isoelectric point determination. The iron contamination amounted to about 3% (as Fe₂O₃) for the sample milled for 60 min. That the iron contamination that occurred mainly on the gibbsite amorphous surface was concluded after a comparison of the isoelectric point determination of the milled samples with that of a mechanical mixture of gibbsite and hematite. X-ray diffraction studies showed that gibbsite looses its crystallinity after the first 5 min of milling.Centro de Tecnología de Recursos Minerales y CerámicaInstituto de Física La Plata2002-03info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf712-717http://sedici.unlp.edu.ar/handle/10915/136992enginfo:eu-repo/semantics/altIdentifier/issn/0884-2914info:eu-repo/semantics/altIdentifier/issn/2044-5326info:eu-repo/semantics/altIdentifier/doi/10.1557/jmr.2002.0102info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by/4.0/Creative Commons Attribution 4.0 International (CC BY 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:32:32Zoai:sedici.unlp.edu.ar:10915/136992Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:32:32.975SEDICI (UNLP) - Universidad Nacional de La Platafalse |
| dc.title.none.fl_str_mv |
Grinding Assistance in the Transformation of Gibbsite to Corundum |
| title |
Grinding Assistance in the Transformation of Gibbsite to Corundum |
| spellingShingle |
Grinding Assistance in the Transformation of Gibbsite to Corundum Torres Sánchez, Rosa María Química Física gibbsite corundum iron contamination |
| title_short |
Grinding Assistance in the Transformation of Gibbsite to Corundum |
| title_full |
Grinding Assistance in the Transformation of Gibbsite to Corundum |
| title_fullStr |
Grinding Assistance in the Transformation of Gibbsite to Corundum |
| title_full_unstemmed |
Grinding Assistance in the Transformation of Gibbsite to Corundum |
| title_sort |
Grinding Assistance in the Transformation of Gibbsite to Corundum |
| dc.creator.none.fl_str_mv |
Torres Sánchez, Rosa María Boix, A. Mercader, Roberto Carlos |
| author |
Torres Sánchez, Rosa María |
| author_facet |
Torres Sánchez, Rosa María Boix, A. Mercader, Roberto Carlos |
| author_role |
author |
| author2 |
Boix, A. Mercader, Roberto Carlos |
| author2_role |
author author |
| dc.subject.none.fl_str_mv |
Química Física gibbsite corundum iron contamination |
| topic |
Química Física gibbsite corundum iron contamination |
| dc.description.none.fl_txt_mv |
After gibbsite was milled for 5 min in a Cr-steel oscillating mill, corundum was obtained by heating the powder for 3 h at 800 °C. We found that iron contamination, produced by the milling process, is essential to attain the transformation at this low temperature and is located at the surface of the gibbsite particles. The knowledge of the oxidation state and location of the contaminant elements, necessary to control the solid-state reactions and/or phase transformations induced by the milling, was realized in this work by a characterization performed by chemical analysis, x-ray photoelectron spectroscopy, Mossbauer spectroscopy, and isoelectric point determination. The iron contamination amounted to about 3% (as Fe₂O₃) for the sample milled for 60 min. That the iron contamination that occurred mainly on the gibbsite amorphous surface was concluded after a comparison of the isoelectric point determination of the milled samples with that of a mechanical mixture of gibbsite and hematite. X-ray diffraction studies showed that gibbsite looses its crystallinity after the first 5 min of milling. Centro de Tecnología de Recursos Minerales y Cerámica Instituto de Física La Plata |
| description |
After gibbsite was milled for 5 min in a Cr-steel oscillating mill, corundum was obtained by heating the powder for 3 h at 800 °C. We found that iron contamination, produced by the milling process, is essential to attain the transformation at this low temperature and is located at the surface of the gibbsite particles. The knowledge of the oxidation state and location of the contaminant elements, necessary to control the solid-state reactions and/or phase transformations induced by the milling, was realized in this work by a characterization performed by chemical analysis, x-ray photoelectron spectroscopy, Mossbauer spectroscopy, and isoelectric point determination. The iron contamination amounted to about 3% (as Fe₂O₃) for the sample milled for 60 min. That the iron contamination that occurred mainly on the gibbsite amorphous surface was concluded after a comparison of the isoelectric point determination of the milled samples with that of a mechanical mixture of gibbsite and hematite. X-ray diffraction studies showed that gibbsite looses its crystallinity after the first 5 min of milling. |
| publishDate |
2002 |
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2002-03 |
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info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Articulo http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
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article |
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publishedVersion |
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http://sedici.unlp.edu.ar/handle/10915/136992 |
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eng |
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eng |
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openAccess |
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