The laws of phase formation in silica gel products obtained using a limestone residue are established. Results of x-ray diffraction, petrographic, and other analyses show that the process of transformation of quartz into high-temperature modifications of silica gel proceeds at a markedly higher rate if the limestone residue is used in a mixture with pyrite cinder rather than with a conventional lime-iron additive. This is related to certain special features of the mineralizer composition and the physicochemical processes involved in the firing. The temperature dependence and kinetics of the conversion of silica gel into its high-temperature structural modifications during the firing of dinas with dry mineralizers were studied in the course of heating in the temperature range from 1200 to 1420°C and during a hold at the maximum heat-treatment temperature. Equations describing the structural transformation processes are derived. A relationship between the physico-chemical properties of the samples and the features of the phase formation processes is demonstrated.
Refractories and Industrial Ceramics – Springer Journals
Published: Nov 26, 2007
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