Estudio preliminar de engobes cerámicos a partir de arcilla blanca de Micaya y Fe2O3 de Mutún
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Rev. Bol. Quim
Abstract
Se realizó la formulación de engobes cerámicos mediante el uso de materias primas naturales bolivianas, como arcilla blanca de Micaya (La Paz) y lamas de óxidos de hierro obtenidos del proceso de pre-concentrado de Mutún (Santa Cruz). Se caracterizaron las materias primas y productos por difracción de Rayos X y análisis térmico gravimétrico diferencial. Caolinita y cuarzo en arcilla blanca, y hematita, goetita y cuarzo en las lamas fueron identificadas. Se mezclaron diferentes concentraciones de óxido de hierro para la formulación de engobes, seguido de un tratamiento térmico a 950°C. Se identificaron las diferencias entre los óxidos naturales de lamas y óxido de hierro comercial usado como referencia. Las características y propiedades colorimétricas en el material final obtenido a partir de los óxidos comerciales y los óxidos de las lamas, son similares. Los resultados obtenidos permiten proponer estas lamas naturales como materia prima pigmento en la elaboración de engobes.
Preliminary study of ceramic slips from white clay from Micaya and Fe2O3 from Mutún. The formulation of ceramic slips was carried out using Bolivian natural raw materials, such as white clay from Micaya (La Paz) and iron oxide slats obtained from the pre-concentration process of Mutún (Santa Cruz). The raw materials and products were characterized by X-ray diffraction and differential gravimetric thermal analysis. Kaolinite and quartz in white clay, and hematite, goethite and quartz in the slats were identified. Different concentrations of iron oxide were mixed for the formulation of slips, followed by a heat treatment at 950°C. The differences between the natural oxides of the slats and commercial iron oxide used as a reference were identified. The characteristics and colorimetric properties in the final material obtained from the commercial oxides and the oxides of the slats are similar. The results obtained allow these natural slats to be proposed as raw pigment material in the elaboration of slips.
Preliminary study of ceramic slips from white clay from Micaya and Fe2O3 from Mutún. The formulation of ceramic slips was carried out using Bolivian natural raw materials, such as white clay from Micaya (La Paz) and iron oxide slats obtained from the pre-concentration process of Mutún (Santa Cruz). The raw materials and products were characterized by X-ray diffraction and differential gravimetric thermal analysis. Kaolinite and quartz in white clay, and hematite, goethite and quartz in the slats were identified. Different concentrations of iron oxide were mixed for the formulation of slips, followed by a heat treatment at 950°C. The differences between the natural oxides of the slats and commercial iron oxide used as a reference were identified. The characteristics and colorimetric properties in the final material obtained from the commercial oxides and the oxides of the slats are similar. The results obtained allow these natural slats to be proposed as raw pigment material in the elaboration of slips.
Description
Vol. 41, No. 2