Abstract
The present study deals with energy savings in brick manufacture. Laboratory driven experiments with additions of Greek lignite (low rank coal) and Spanish claystone have been performed. In particular, co-firing of clay raw material with organic additives is performed in order to minimise the fuel consumption while maintaining the good quality of the brick. Using XRD, ESEM and DTA techniques, mineralogical compositions and mineral transformations were observed both in raw material and in clay-lignite mixtures. For the analyses of hydrated phases, a low-cost and useful modification of a traditional diffractometer has been demonstrated. Fuel saving in brick firing was also revealed with the addition of lignite to claystone samples. Due to the natural variability of both clays and lignites, the results of this study do not necessarily imply that coal-clay mixtures may always have similar performance.
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