Journal
MINERALS
Volume 10, Issue 2, Pages -Publisher
MDPI
DOI: 10.3390/min10020142
Keywords
mineralogy; applications; kaolinite; rheological properties; shrinkage; traditional ceramics
Funding
- Generalitat de Catalunya [SGR-2017SGR1687, 2017SGR0707]
- [FBG 307466]
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This research characterizes the kaolinitic clays from Cretaceous-Paleocene lateritic deposits of Terra Alta (south Catalonia) to evaluate their possible applications. The outcrops and quarries belong to the Horta de Sant Joan and Pinell de Brai areas. The chemical composition, mineralogy, rheological behavior, particle size distribution and plasticity are determined. The Fe and Ti4+ contents prevent them from being directly used as raw material for white ceramics. The mineralogy consists of kaolinite with quartz, illite, hematite, and minor K-feldspar and calcite. Most of the area comprises medium plastic clays that are classified as fired clays and can be used as ceramic and construction materials. In Horta de Sant Joan, a kaolinitic-rich level, up to 75 wt % of kaolinite, is highly crystalline with low plasticity and can be classified as flint clay, useful as a refractory clay. The evaluated kaolinitic clays can also be used to obtain a triaxial ceramic when they are mixed with feldspar to act as a fluxing agent and chamotte.
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