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000168601 005__ 20260212204407.0
000168601 0247_ $$2doi$$a10.3390/min16020178
000168601 0248_ $$2sideral$$a148017
000168601 037__ $$aART-2026-148017
000168601 041__ $$aeng
000168601 100__ $$0(orcid)0000-0002-2169-4561$$aYuste, Alfonso$$uUniversidad de Zaragoza
000168601 245__ $$aExploring Lower Cretaceous Karst Bauxite from South-Central Pyrenean Unit (NE Spain): Genesis and Ceramic Potential
000168601 260__ $$c2026
000168601 5060_ $$aAccess copy available to the general public$$fUnrestricted
000168601 5203_ $$aThis study investigates a karst bauxite deposit from NE Spain with a dual objective incorporating the novel aspect of directly linking genetic processes to industrial ceramic performance. First, the bauxite is mineralogically and texturally characterized using X-ray diffraction and field emission scanning electron microscopy. Second, the mineralogical and textural transformations of the bauxite during firing at 1000, 1200 and 1300 °C are analyzed, together with their effects on the physical properties of the fired products. The Lower Cretaceous bauxite is autochthonous, shows a pisolithic structure, and formed in situ under tropical monsoon conditions through intense chemical weathering involving dissolution–crystallization processes. For ceramic testing, the bauxite was mixed with illitic–kaolinitic clays in a 90/10 proportion. During firing, kaolinite and illite destabilize and transform into mullite, initially by solid-state reactions at 1000 °C and subsequently by crystallization from a vitreous phase at higher temperatures, producing larger crystals and composition closer to the empirical mullite formula. The formation of vitreous phase and mullite leads to reduced porosity and increased density and linear shrinkage, particularly between 1000 and 1200 °C. Specimens fired at 1300 °C show higher mechanical strength, related to higher mullite content and a larger size of its crystals. The results demonstrate the potential interest of these bauxites for ceramic manufacturing.
000168601 536__ $$9info:eu-repo/grantAgreement/ES/MCIU/PID2021-123127OB-I00$$9nfo:eu-repo/grantAgreement/ES/MICINN/JDC2022-048348-I
000168601 540__ $$9info:eu-repo/semantics/openAccess$$aby$$uhttps://creativecommons.org/licenses/by/4.0/deed.es
000168601 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000168601 700__ $$0(orcid)0000-0002-4970-6333$$aBauluz, Blanca$$uUniversidad de Zaragoza
000168601 700__ $$aLaita, Elisa
000168601 7102_ $$12000$$2120$$aUniversidad de Zaragoza$$bDpto. Ciencias de la Tierra$$cÁrea Cristalografía Mineralog.
000168601 773__ $$g16, 2 (2026), 178 [23 pp.]$$pMinerals (Basel)$$tMinerals$$x2075-163X
000168601 8564_ $$s14166066$$uhttps://zaguan.unizar.es/record/168601/files/texto_completo.pdf$$yVersión publicada
000168601 8564_ $$s2429964$$uhttps://zaguan.unizar.es/record/168601/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000168601 909CO $$ooai:zaguan.unizar.es:168601$$particulos$$pdriver
000168601 951__ $$a2026-02-12-20:41:35
000168601 980__ $$aARTICLE