A Study of the Reaction Rates between Silica and Other Oxides at Various Temperatures. Part IV: Influence of the Form in which the Non-silica Constituents are Introduced upon their Rates of Reaction with Silica.

JSGT 1953 V37 T182-T189

A study has been made of the reaction rates of various compounds of sodium, calcium, magnesium, boron and aluminium, with silica, the extent of the reaction after firing at various temperatures for different times having been estimated by the x-ray-diffraction technique previously described. The results obtained indicate that the fluorides react at a much higher rate than any of the other compounds used and that the nitrates and the carbonates of the different metals react more readily than the corresponding sulphates or chlorides. The presence of combined water in the material introduced increases the rate of reaction, also a compound which contains one or more of the metallic oxides, and which can be broken down or melted at comparatively low temperatures, reacts with silica more rapidly than the oxides when introduced as separate constituents of the mixture or as the carbonates.

Abd-El-Moneim Abou-El-Azm