Affiliation:
1. Departamento Cristalografía, Mineralogía y Química Agrícola, Universidad de Sevilla, 41012 Sevilla, Spain
Abstract
The use of aluminum-rich clays and bauxites as refractory materials is common. Upon firing, these materials form mullite crystals in the shape of needles embedded in a siliceous and vitreous matrix, with mullite being responsible for the refractory properties. In this study, bauxite samples for use in refractory applications have been characterized. Chemical analysis revealed that the alumina content varied between 34 and 40%, with silica values generally being high (around 40%), except for one sample (26%). Two samples were found to be the most suitable for use as “refractory clay” refractories. However, high silica or Fe oxide contents can affect mineralogical transformations at high temperatures. Mineralogical analysis confirmed the presence of several minerals in the bauxite materials, including kaolinite, halloysite, anatase, rutile, gibbsite and boehmite. Differential thermal analysis (DTA) showed the decomposition of gibbsite and its partial transformation to boehmite and alumina, and the dehydroxylation of kaolinite, with primary mullite crystallization observed at a high temperature. These findings provide valuable information for the selection and optimization of bauxite materials for refractory applications, considering their chemical composition and mineralogical characteristics.
Funder
Spanish Ministerio de Educación y Ciencia
V Plan Propio de Investigación de la Universidad de Sevilla
Subject
General Energy,General Engineering,General Chemical Engineering
Reference55 articles.
1. Tendencias Generales En La Industria Española de Cerámica y Refractarios;Bol. Soc. Esp. Ceram. Vidr.,1994
2. Jenkins, B., and Mullinger, P. (2022). Industrial and Process Furnaces: Principles, Design and Operation, Butterworth-Heinemann.
3. Walker, H. (2005). Handbook of Refractory Practice, Harbison Walker Refractories Company.
4. Influence of in Situ Phase Formation on Microstructural Evolution and Properties of Castable Refractories;Sarpoolaky;Ceram. Int.,2002
5. Production of Sintered High Alumina Refractories from Turkish Bauxite Ore;Mergen;Adv. Appl. Ceram.,2004