Process for the direct production of steel

Details Process for the direct production of steel Process for the direct production of steel

C - Chemistry, Metallurgy

21

C

53/45

C21C 5/28 (2006.01)

Patent

CA 1110075

ABSTRACT OF THE DISCLOSURE A process for the direct production of steel from particulate iron oxides or concentrates including two major steps in which in Step (1) the iron oxides are converted to iron carbide and in Step (2) steel is produced directly from the carbide in the basic oxygen furnace or the electric furnace. In the production of the carbide the oxides are reduced and carburized in a single operation using a mixture of hydrogen as a reducing agent and carbon bearing substances such as propane primarily as carburizing agents. Iron carbide thus produced is introduced as all or part of the charge into a basic oxygen furnace to produce steel directly without the blast furnace step. In order to make the steel making process auto-thermal, heat is supplied either by using the hot iron carbide from Step (1) or preheating the iron carbide or by in- cluding sufficient fuel in the iron carbide to supply the required heat by combustion. This divisional application is particularly directed to a process of making steel from iron carbide in the basic oxygen furnace which comprises adding pig iron to the iron carbide charge and controlling the temperature of the charge by the addition of iron carbide.

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