Process for desulfurizing molten pig iron
AssigneeNippon Steel Corporation
InventorsToshiharu Mitsuo, Takeshi Shoji, Shin-ichi Sanuki
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Abstract
The present invention provides an improved process for desulfurization of molten pig iron by a first step of adding powdered aluminum to the molten pig iron and a second step of adding CaO to the molten pig iron, the improvement comprising adding the aluminum as a powdery mixture with CaO, alumina or both, whereby splashing associated with the addition of aluminum alone is reduced.
Claims10
In a method for the desulfurization of molten pig iron by adding powdered aluminum and CaO to the molten pig iron, the improvement which comprises adding aluminum as a powder with CaO, alumina or both, whereby splashing associated with the addition of aluminum alone is reduced and wherein the aluminum is added in a quantity sufficient to have an aluminum concentration in the molten pig iron by weight % of (0.01-0.1).times.(the concentration of silicon in the molten pig iron by weight %)+(0.2-1.0).times. (concentration of sulfur by weight % to be removed from the molten pig iron).
Dependencies are inferred from the claim text.