Direct reduction method and rotary hearth furnace

Details Direct reduction method and rotary hearth furnace Direct reduction method and rotary hearth furnace

C - Chemistry, Metallurgy

21

B

C21B 13/00 (2006.01) C21B 13/10 (2006.01) C22B 1/216 (2006.01) C22B 5/10 (2006.01) F27B 3/10 (2006.01) F27B 9/16 (2006.01) F27B 9/30 (2006.01) F27D 7/00 (2006.01) F27D 99/00 (2010.01) F27B 9/36 (2006.01)

Patent

CA 2307422

Raw materials, including a metal oxide and a carbonaceous material, are supplied into a rotary hearth furnace. Then, the raw materials are heated and reduced by burners, which are arranged to cause a strong stirring action for an atmosphere around the raw materials, in an early reducing period that is defined as a period during which 70 - 80 % of a total amount of a flammable gas generated from the raw materials is generated. In a latter period subsequent to the early reducing period, the raw materials are heated and reduced by burners arranged to cause a weak stirring action for an atmosphere around the raw materials, whereby a metal is manufactured. With the present invention, productivity can be improved and the fuel consumption per unit product can be reduced.

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