Abstract
An experimental study is carried out to determine the possibility of utilizing the recycled sinter ore dust for refinging flux for hot metal. The dust has good physical and chemical properties as an injection powder, however, it contains masses of about 0.24% S and a substantial amount of sulfur which can be picked up by the hot metal during the injection treatment. Therefore, sinter ore dust is mixed with burnt lime, fluorspar and sodium carbonate to increase the sulfide capacity of the flux. The fluxes are tested for hot metal dephosphorization and desulfurization in laboratory and plant scale experiments. The fluxes show an excellent dephosphorization efficiency without sulfur pick up. In case of the flux containing sodium carbonate masses of 10%, sulfur in hot metal is simultaneously removed. In addition, a higher manganese yield in hot metal is obtained in case of a sodium carbonate containing flux at the end of injection treatment.
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