Desulphuration of metals
AssigneeFoseco International Limited
InventorsStephen M. Cooper, Thomas H. Webster, Helmut Jaunich
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Abstract
Injectable composition for desulphurizing molten ferrous metals, especially iron, comprises alkaline earth metal, preferably magnesium, and sintered mixture of lime and at least one fluxing agent. Magnesium is preferably 8 to 60% of composition and lime preferably is 45 to 95% of the sintered mixture. Fluxing agent is preferably alumina and fluoride. Composition enables rapid and efficient desulphurization and does not give large amounts of slag.
Claims10
An injectable composition, for desulphurising a molten ferrous metal, comprising an alkaline earth metal and lime, in which the lime is in the form of a sintered mixture of lime and at least one fluxing agent usable with lime to form a desulphurising slag for molten ferrous metals, the mixture of lime and fluxing agent having been sintered at 1100.degree.-1200.degree. C. and then screened, said composition being characterized by a reduced rate of water adsorption on exposure to the atmosphere and consequently improved storage ability in comparison to a corresponding composition wherein the lime is not sintered.
A method of desulphurising a molten ferrous metal by injecting into the metal a composition comprising an alkaline earth metal and lime, in which the lime in the composition is in the form of a sintered mixture of lime and at least one fluxing agent usable with lime to form a desulphurising slag for molten ferrous metals, the mixture of lime and fluxing agent having been sintered at 1100.degree.-1200.degree. C. and then screened, said composition being characterized by a reduced rate of water adsorption on exposure to the atmosphere and consequently improved storage ability in comparison to a corresponding composition wherein the lime is not sintered.
Dependencies are inferred from the claim text.