Fine-grained agent for desulfurizing molten iron

Details Fine-grained agent for desulfurizing molten iron Fine-grained agent for desulfurizing molten iron

C - Chemistry, Metallurgy

21

C

53/94

C21C 1/02 (2006.01) C21C 7/064 (2006.01)

Patent

CA 1261633

ABSTRACT A fine-grained agent for desulfurizing molten iron comprises industrial calcium carbide, dried coal which con- tains at least 15% by weight of volatile constituents and which, immediately after being passed into the molten iron, releases at least 80 standard litres of gas per kg of coal, and optionally fine-grained magnesium. The coals used are lignites, flame coal, gas-flame coal, gas coal or coking coal. The agent is prepared by addition of the dried coal to the calcium carbide, if appropriate pre-crushed, and common comminution to a grain size of 90% < 200 µm. The fine- grained magnesium is present in the agent either in uniform distribution, or it is stored and fluidized separately from the carbide/coal mixture and added to the carbide/coal mixture in the transport line or in the lance, if appropriate with variation during injection.

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