| Abstrakt: |
Abstract: On the basis of experience gained with melting glasses containing chromates in the batch, the authors assume that alkali chromates react at high temperatures in air spontaneously with silica, forming Cr2O3 and alkali silicate, and liberating oxygen. The assumption was experimentally verified on mixtures of SiO2 with sodium and potassium chromates, at 2:1 and 4:1 ratios, using DTA, GTA, X-ray diffraction and gas chromatography of the gaseous reaction products. It has been proved by GTA that the reaction of SiO2 with Na2CrO4 takes place over the range of 1073 to 1120°C, and that with K2CrO4 at 1220 to 1360°C. |
