REMOVAL OF ALKALIS FROM BLAST-FURNACES

Laboratory experiments are being undertaken to examine what influence is exerted on the removal of alkalies and sulphur from blast furnaces by charging a burden of slightly reduced basicity and by simultaneousl y injecting fluxes through the tuyeres. Just a small shift in the inpu t of fluxes from the furnace top to the tuyere level (20 kg/t HM) can both appreciably increase the removal of alkalies with the slag and im prove the desulphurisation. Such a mode of furnace operation appears s uitable to reduce the discharge of alkalies via the blast furnace top gas RE-HM and, at the same time, to attenuate the negative influences of alkalies on furnace operation.