Abstract
DC arc smelting is one of the recent techniques to smelt fine ore particles. First time in the world, Indian chromite ores were smelted in DC arc furnace in Pilot Plant of Mintek, South Africa, to produce high carbon ferrochrome (HCFeCr). Major objective was maximisation of Cr content in HCFeCr. Investigations include factors influencing chromium content, interdependence of C, Si and Cr, and control of reductants for maximising Cr. Screening increased Cr/Fe ratio of feed ore, most important factor, from 2·39 to 2·97, enabling to produce HCFeCr with 65·60%Cr, compared to 64%Cr product from unscreened ore. Product lower in Si, P and S, and 6% higher Cr recovery were achieved compared to conventional AC furnace route. Process holds tremendous potential for low cost HCFeCr production.
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