Potentialities of the method of burning-off admixtures in production of heat-insulating refractories

Abstract

A brief analysis of techniques for manufacturing lightweight refractories is presented. It is noted that the shortest drying time of the green and reduced fuel and power expenditures are achieved by using low-waste and material-saving production methods, on the one hand, and intensification of the processes, on the other. Requirements on an active burning-off admixture that would radically improve the process are formulated. The scientific principles for making lightweight materials by the method of self-compacting mixtures are given. It is shown that the mixing water should be removed from the molds rapidly by creating an excessive internal pressure in the mixture placed in a closed perforated volume, rather than by evaporation. The mechanism of filtration transfer of moisture and self-compaction of the material is described for mineral-polystyrene mixtures and different methods of thermal energy supply to the molds.