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AssigneesThyssen Stahl AG, SKW Trostberg Aktiengesellschaft
InventorsWalter Meichsner, Werner Gmohling, Manfred Tutte, Karl-Heinz Peters
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A fine-grained agent for desulfurizing molten iron comprising industrial calcium carbide, dried coal which contains at least 15% by weight of volatile constituents and which, immediately after being passed into the molten iron, releases at least 80 standard liters of gas per kg of coal, and optionally contains 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 comminuted to a grain size of 90% <200 .mu.m. 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.
A fine-grain agent for the desulfurization of molten iron, which is based on calcium carbide and which is injected in fluidized form into an iron melt by means of a gas, the agent consisting essentially of industrial calcium carbide and a dried coal which contains at least 15% by weight of volatile components and which evolves a gas volume of at least 80 standard liters of gas/kg of coal at the temperature of the iron melt.
Dependencies are inferred from the claim text.