Melting of Pre-Reduced Chromite Pellet Bearing Carbon

As the raw material for hot metal containing chromium from 20% to 40%, carbon-beared chromite pellets made from three kinds of typical chromite were reduced at 1 300 ℃ for 30 min and then kept at 1 550-1 600℃ for 10 min. The effect of Cr2 O3/FeO mass ratio in pellets on chromium content in hot metal and the yield of chromium were investigated. The results indicated that the highest chromium content is in hot metal produced from South African UG2 ore, but slag volume produced with Indian chromite is the smallest. The yield of chromium is only 60% to 75%, due to short melting time, high melting point and large surface tension of the slag with high Al2 O3 and MgO content, which influences the separation between metal and slag.