METHOD FOR DEPHOSPHORIZING MOLTEN PIG IRON

Title:

METHOD FOR DEPHOSPHORIZING MOLTEN PIG IRON

Document Type and Number:

Japanese Patent JP3898964

Kind Code:

B2

Abstract:

PROBLEM TO BE SOLVED: To provide a method for effectively removing phosphorous by accelerating conversion of lime into slag, in a process of removing phosphorus from molten pig iron with the use of a top and bottom combined blown converter.
SOLUTION: This method for dephosphorizing the molten pig iron with the use of the top and bottom combined blown converter, is characterized by using a refining agent containing quicklime (CaO) as a main component, charging Al into the molten pig iron, and then performing dephosphorization blowing. In the above method, an Al charge is preferably in a range of 0.02-0.40 (mass%) in terms of an [Al] concentration in the molten pig iron.

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Inventors:

Harashima Wakai
Yoshimoto Demoto
Hiroshi Anjo

Application Number:

JP2002058648A

Publication Date:

March 28, 2007

Filing Date:

March 05, 2002

Export Citation:

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Assignee:

Nippon Steel Corporation

International Classes:

C21C5/35; C21C1/02; (IPC1-7): C21C5/35; C21C1/02

Domestic Patent References:

JP2000248307A
JP2001303117A
JP2002220616A

Attorney, Agent or Firm:

Tomoyuki Yabuki
Tsugeko Shigeo

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