Steelmaking process

Details Steelmaking process Steelmaking process

C - Chemistry, Metallurgy

21

B

53/26

C21B 13/12 (2006.01) C21B 13/14 (2006.01) C21C 5/52 (2006.01)

Patent

CA 1141166

ABSTRACT OF THE DISCLOSURE: Residual materials which become available in metallurgy and contain oxides and volatilizable nonferrous metals or compounds thereof are treated in a rotary kiln with solid carbonaceous reducing agents and are thus directly reduced in a high proportion to sponge iron whereas a substantial part of their nonferrous metal content is volatilized. The solids discharged from the rotary kiln are sieved with a parting size of about 3 to 10 mm, depending on the feed grading of the residual materials and their disintegration characteristics, so that a major part of the unmagnetic material is included in the fine fraction. The coarse fraction is subjected to electromagnetic separation. The magnetic fraction is subjected to an electro-slag resistance process. The unmagnetic fraction is incorporated in and bonded to the feed mixture for the rotary kiln by a tumbling or pelletizing operation.

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