Influence of pre-reduction of ore on the temperature profile inside a submerged-arc furnace producing ferro-chromium

The temperature profile inside the submerged-are furnace (S.A.F) has a sign ificant influence on the quality of the ferro-chromium produced. This profi le is controlled by the degree of pre-reduction the ore is subjected to. A mathematical model has been developed to describe the temperature profile i nside the S.A.F and the influence of pre-reduction on the profile has been explored. Increasing levels of pre-reduction increases the temperatures in the various zones of the furnace. Other factors remaining the same, this is expected to increase the level of silicon in the hot metal. This can be co ntrolled by controlling the heat generated in the furnace.