Preparation of ceramic composite powders from waste colliery minestones

An investigation was carried out to examine the potential for producing ceramic composites from waste colliery minestones. The nature of the raw materials had a marked influence on the kinetics and the product morphology. The product phases and product composition were dependent on the reaction temperature. Mullite-SiC composite powders could be formed at temperatures below 1300‡C while AlO-SiC was the final product of reduction at higher temperatures.