High-Temperature Mineral Formation after Firing Clay Materials Associated with Mined Coal in Teruel (Spain)
Open Access
- 29 April 2020
- journal article
- research article
- Published by MDPI AG in Applied Sciences
- Vol. 10 (9), 3114
- https://doi.org/10.3390/app10093114
Abstract
The production of porcelain stoneware has experienced a considerable increase. Therefore, it was necessary to undertake an investigation that would allow knowing the mineralogical evolution that porcelain stoneware undergoes during the firing process, as well as establishing the influence of the formation of mullite and other mineral or vitreous phases and their quantification. The firing transformations of mine spoils associated with mined coal in the Utrillas-Escucha-Estercuel and Ariño-Andorra areas are studied in this paper. The mineralogical composition of the bulk mine spoils is kaolinite, illite, chlorite, and smectites (in traces), with quartz and feldspar, and minor hematite, calcite, and dolomite. The main objective is to understand the generation of high-temperature mineral phases after firing, and their quantification. The formation of mullite and other high-temperature phases are studied from samples that include variable proportions of illite. Samples with a high content of illite generate mullite at 995 °C. Cristobalite was not detected as a high-temperature phase. Mullite is the most abundant mineral. The hercynite content is higher at low temperatures (995 °C), and hematite content is higher at 1150 °C. The vitreous phase represents about 50% of fired bodies. Despite observing a porous microstructure, the non-porous areas are well sintered.This publication has 14 references indexed in Scilit:
- High-Temperature Mineral Phases Generated in Natural Clinkers by Spontaneous Combustion of CoalMinerals, 2019
- Properties and possible ceramic uses of clays from lignite mine spoils of NW SpainApplied Clay Science, 2015
- Mineralogical analysis of ceramic tiles by FTIR: A quantitative attemptApplied Clay Science, 2015
- Clays and bodies for ceramic tiles: Reappraisal and technological classificationApplied Clay Science, 2014
- Influence of firing temperature and mineralogical composition on bending strength and porosity of ceramic tile bodiesApplied Clay Science, 2008
- Classification and statistical analysis of mine spoils chemical composition from Oliete basin (Teruel, NE Spain)Environmental Geology, 2008
- Use of mine spoils from Teruel coal mining district (NE, Spain)Environmental Geology, 2008
- Modificación microestructural de minerales arcillosos en ball clays de Teruel mediante tratamiento térmicoBoletín de la Sociedad Española de Cerámica y Vidrio, 2006
- TEM study of mineral transformations in fired carbonated clays: relevance to brick makingClay Minerals, 2004
- Firing transformations of cretaceous clays used in the manufacturing of ceramic tilesApplied Clay Science, 1999