Controlled foamy slag process

Details Controlled foamy slag process Controlled foamy slag process

C - Chemistry, Metallurgy

21

B

C21B 13/00 (2006.01) C21B 3/00 (2006.01) C21C 5/32 (2006.01) C21C 5/36 (2006.01)

Patent

CA 2159231

A method of improving the post-combustion heat recovery in a basic oxygen furnace by controllably forming a foamy slag. The foamy slag is generatedby increasing the lance height and reducing the rate of lance height reduction during the oxygen blowing cycle. The foamy slag is controlled to prevent slopping by calculating the approximate starting point of the peak decarburization periodfor the charge and then adjusting the oxygen flow rate to be at a minimum at thecommencement of the peak decarburization period.

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