DESULFURIZING MIX AND METHOD FOR DESULFURIZING MOLTEN IRON

摘要

A desulfurization composition contains from about 3 % to about 20 % particulate metallic aluminum, about 5 % to about 30 % particulate alumina, about 0.5 % to about 12 % particulate hydrocarbon material or other gas generating composition and the balance lime plus impurities. Preferably aluminum dross is the source of aluminum and alumina. The desulfurization composition is injected into molten iron from a blast furnace preferably in an amount of 0.7 to 7.5 kilograms desulfurizer per ton (907.2 kg.) of hot metal. The desulfurizing composition can be injected as a blend or co-injected into the hot metal through a lance using a carrier gas or dumped into the hot metal as it is being poured into the ladle. At least for torpedo ladles, the desulfurization composition can be placed in the ladle before the hot metal is poured into it.