
doi: 10.1007/bf01295024
The ecologically dangerous chromium oxide CrO3 is formed in refractories on the phase boundaries. Upon contact of chromite with alkalis and the oxides CaO, BaO, and SrO, the conversion Cr3+ → Cr6+ in air is accelerated, and occurs with remarkable speed. Therefore, in chromium-containing refractories or in materials in contact with them, the content of alkalis and calcium oxide should be minimal.
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