Method for dephosphorization of hot metal, and refining agent
AssigneeJfe Steel Corporation
InventorsYusuke Fujii, Yoshie Nakai, Mikihiro Mori, Takahiko Maeda, Naoki Kikuchi, Noritaka Nishiguchi
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Abstract
When performing dephosphorization treatment of hot metal by adding a refining agent as a lime source and an oxygen source (dephosphorizing agent(s) and a gaseous oxygen source into the hot metal accommodated in a hot metal holding container, the refining agent used is a refining agent having an Ig-loss value of from 4.0% by mass to 35.0% by mass and including 60% by mass or more of quicklime.
Claims8
A method for dephosphorizing hot metal, wherein, during performing dephosphorization treatment of the hot metal by adding a refining agent as a lime source and an oxygen source to the hot metal accommodated in a hot metal holding container, the refining agent having an Ig-loss value of from 5.0% by mass to 24.0% by mass and including 60% by mass or more of quick lime and further including one or both of calcium carbonate and calcium hydroxide, wherein the % by mass refers to a total mass of the refining agent,
- wherein when adding the refining agent, the refining agent is injected under a bath surface of the hot metal.
A refining agent having an Ig-loss value of from 5.0% by mass to 24.0% by mass, including 60% by mass or more of quick lime and further including one or both of calcium carbonate and calcium hydroxide, and used for dephosphorization treatment of hot metal by injection under a bath surface of the hot metal, wherein the % by mass refers to a total mass of the refining agent.
Dependencies are inferred from the claim text.