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• W2258583775 abstract "Alternative technological approach is proposed enabling utilization of raw materials from an oil refinery, such as waste guard layers from reactors. Reagent grade and purified MgO, Cr2O3, Fe2O3, and nitric acid (HNO3), were used as additional precursors. The homogeneous mixtures obtained were formed into pellets and sintered at different temperatures. The main phase was proved by X-ray phase analysis (XRD) and compared to ICPDS database. The main phase in the ceramics synthesized was solid solution of spinel MgAl2O4 and magnesiochromite. These minerals are classified as chromspinelide MgCr1.2Al0.4Fe0.4O4 and alumochromite MgCr1.6Al0.4O4. Additional SEM observations, combined with EDX analysis were performed, evincing agglomeration at lower temperatures, followed by agglomerate crumbling, at elevated calcination temperature. The complete transformation of initial precursors into the final ceramic compounds was found to occur at 800 °C – 1 h. The ceramic samples synthesized had high density of 1.72–1.93 g/cm3 and large absorption area – 32.93% which is probably due to the high porosity of the sample. En este trabajo se propone un método para el aprovechamiento de materiales provenientes de residuos de las refinerías de petróleo, utilizando para ello los desechos de las capas protectoras de los reactores químicos. Usando como precursores adicionales, reactivos de alta pureza tales como MgO, Cr2O3, Fe2O3, y ácido nítrico (HNO3), se han preparado mezclas homogéneas en forma de pastillas, que se han sometido calcinadas a diferentes temperaturas. Las fases obtenidas han sido analizadas mediante difractometría de rayos X. La fase dominante de los pigmentos cerámicos obtenidos está compuesta por una solución sólida de tipo espinela MgAl2O4 y cromato de magnesio. Esos productos se clasifican como espinelas de cromo MgCr1.2Al0.4Fe0.4O4 y cromato de aluminio MgCr1.6Al0.4O4. Adicionalmente, se han realizado observaciones mediante microscopia electrónica de barrido combinada con análisis químico por energías dispersivas de rayos X. Los materiales resultantes presentan aglomerados debido a las bajas temperaturas de calcinación. Se ha establecido que después de una exposición a 800 °C durante una hora, los precursores se transformaron completamente en pigmentos cerámicos. Los pigmentos cerámicos obtenidos poseen una alta densidad en el rango de 1,85 a 2,60 g/cm3 y una porosidad abierta entre 28,9 y 32,93% a 700 °C." @default.
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• W2258583775 date "2016-03-01" @default.
• W2258583775 modified "2023-09-26" @default.
• W2258583775 title "Alternative technological approach for synthesis of ceramic pigments by waste materials recycling" @default.
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• W2258583775 doi "https://doi.org/10.1016/j.bsecv.2016.01.002" @default.
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