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http://hdl.handle.net/2445/194014
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DC Field | Value | Language |
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dc.contributor.author | Alfonso Abella, María Pura | - |
dc.contributor.author | Penedo, L.A. | - |
dc.contributor.author | Garcia Vallès, Maite | - |
dc.contributor.author | Martínez Manent, Salvador | - |
dc.contributor.author | Martinez, A. | - |
dc.contributor.author | Trujillo, J.E. | - |
dc.date.accessioned | 2023-02-23T10:26:17Z | - |
dc.date.available | 2023-02-23T10:26:17Z | - |
dc.date.issued | 2022-02-01 | - |
dc.identifier.issn | 1388-6150 | - |
dc.identifier.uri | http://hdl.handle.net/2445/194014 | - |
dc.description.abstract | Kaolin is widespread as a result of the alteration in the San José Sn-Ag deposit located in Oruro, Bolivia. This study presents a chemical, mineralogical and thermal characterization of the San José kaolinitic deposit, which is necessary to determine their optimal applications. Mineral phases of these white silty kaolinitic materials were determined by X-ray diffraction (XRD) and are quartz, kaolinite, K-feldspar, muscovite, illite and minor halloysite, dickite, plagioclase, jarosite, rutile, alunite and gypsum. The fraction < 63 µm contains 20-27 mass% of kaolinite. Differential thermal analysis (DTA) shows an endothermic peak at 520 °C associated with the dehydroxylation of kaolinite and an exothermic peak at ~ 980 °C related to the crystallization of mullite. TG curves show a total mass loss up to 1300 °C of about 8 mass%. The dilatometric curves show a shrinkage at about 890 °C produced by the collapse of metakaolinite into a spinel-like structure, and another shrinkage starts at 1010 °C, at the beginning of the sintering, when the spinel-like phase is transformed to mullite and amorphous SiO2. Lightness L* is 80-92, but only the mined materials have b* < 4, suitable for paper filling applications. | - |
dc.format.extent | 9 p. | - |
dc.format.mimetype | application/pdf | - |
dc.language.iso | eng | - |
dc.publisher | Springer | - |
dc.relation.isformatof | Reproducció del document publicat a: https://doi.org/10.1007/s10973-022-11245-3 | - |
dc.relation.ispartof | Journal of Thermal Analysis and Calorimetry, 2022, vol. 147, num. 9, p. 5413-5421 | - |
dc.relation.uri | https://doi.org/10.1007/s10973-022-11245-3 | - |
dc.rights | (c) The Author(s), 2022 | - |
dc.rights.uri | http://creativecommons.org/licenses/by/3.0/es/ | * |
dc.source | Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada) | - |
dc.subject.classification | Mineralogia | - |
dc.subject.classification | Caolí | - |
dc.subject.classification | Bolívia | - |
dc.subject.other | Mineralogy | - |
dc.subject.other | Kaolin | - |
dc.subject.other | Bolivia | - |
dc.title | Thermal behaviour of kaolinitic raw materials from San José (Oruro, Bolivia) | - |
dc.type | info:eu-repo/semantics/article | - |
dc.type | info:eu-repo/semantics/acceptedVersion | - |
dc.identifier.idgrec | 728102 | - |
dc.date.updated | 2023-02-23T10:26:17Z | - |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | - |
Appears in Collections: | Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada) |
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728102.pdf | 1.13 MB | Adobe PDF | View/Open |
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