Title:
PRELIMINARY TREATMENT METHOD FOR MOLTEN PIG IRON
Document Type and Number:
Japanese Patent JP3797206
Kind Code:
B
Abstract:
PROBLEM TO BE SOLVED: To provide a method for removing Mn and Cr together with S and P from molten pig iron, which can moderately regulate for tapping the low-Cr molten pig iron or low-Mn molten pig iron in operating a blast furnace, and can increase a degree of freedom for blending raw materials.
SOLUTION: This method comprises forming top slag through desulfurizing molten pig iron containing Si of 0.08% or more, and blowing an oxidizing agent and a flux, while maintaining the basicity Bi(CaO/SiO2) of the top slag to 1.8 or higher, which is defined in the equation: Bi=(CaO in the blown flux)/(SiO2 in the blown flux + generated SiO2 by oxidation of Si in molten pig iron during blowing).
Inventors:
Mitsuzono, Masayuki
Suda, Mamoru
Fujimura, Toshio
Nomura, Hiroshi
Suda, Mamoru
Fujimura, Toshio
Nomura, Hiroshi
Application Number:
JP2001000358226
Publication Date:
April 28, 2006
Filing Date:
November 22, 2001
Export Citation:
Assignee:
KAWASAKI STEEL CORP
International Classes:
C21C1/04; C21C1/02; C21C1/00; C21C1/02; (IPC1-7): C21C1/04; C21C1/02
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