Calcium chromate mineral phases with high CaO content
Mirtič, Breda
A corrosion of chrome magnesia brick occurs during the process of cement clinker burning. Due to the diffusion of calcium into the porous brick, evaporated chromium from chromite grains reacts with ...the calcium, and crystallisation of calcium chromate mineral phases is possible. Migration of evaporated chromium from the brick to the surface of the cement clinker is also predicted. Chromium reacts with lime or/and alkaline elements from cement clinker and is deposited as a green mould on the surface of the clinker. Calcium chromate with a Ca3(CrO4)2 composition is proved by x-ray diffraction. Ca3(CrO4)2 is formed in the temperature interval from 959°C up to 1143°C when the CaO/Cr2O3 ratio is > 3/1 in an oxidizing atmosphere. All calcium chromate mineral phases are synthesised in a laboratory furnace. They are stable in an oxidizing atmosphere at different tempertures, if the CaO/Cr2O3 molar ratio is > 3/1. Their regions of stability are determined by thermo-balance measurments. Mineral phases is proved by x-ray diffraction, light and electron microscopy.
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