2026-04-14T03:17:34Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/1568182025-11-20T13:57:22Zcom_2072_1057col_2072_478778col_2072_478917col_2072_478923

00925njm 22002777a 4500 dc Garcia Vallès, Maite author Alfonso Abella, María Pura author Martínez Manent, Salvador author Roca Pascual, Núria author 2020-04-22T10:56:21Z 2020-04-22T10:56:21Z 2020-02-07 2020-04-22T10:56:22Z This research characterizes the kaolinitic clays from Cretaceous-Paleocene lateritic depòsits 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. Mineralogia Argila Caolí Ceràmica Mineralogy Clay Kaolin Pottery Mineralogical and thermal characterization of kaolinitic clays from Terra Alta (Catalonia, Spain)