Basic Refractories from Indigenous Chrome Ores

For manufacture of basic refractories of chrome-magnesite type use of high grade chrome ores with low SiO2, (<4%) and iron oxide (18–20% max) has been recommended. Such chrome ores are not readily available in India. As such, the possibility of utilising indigenous chrome ores with varying amounts of SiO2 and iron oxide for manufacture of chrome magnesite type of refractories has been discussed in this paper. Laboratory results indicate that chrome ores with even 8 to 10% SiO2 could be used and chrome concentrate with 7% SiO2 may be utilised. The ratio of chrome and magnesite varies with the quality of chrome ores used. Proper adjustment of grain sizes is an important factor.