Arc steelmaking
AssigneeFoseco International Limited
InventorEvan Thomas Richard Jones
Life of this patent
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Abstract
The invention provides a slag conditioner for use in electric arc steelmaking which comprises 30 to 80% by weight of alumina, 10 to 30% by weight of aluminium 5 to 40% by weight fluorspar and 0 to 20% by weight of alkali metal carbonate. The conditioner is added with lime to deoxidized steel suitably in an amount of from 5 to 15 Kg/tonne of steel to promote rapid reduction of the initial refining slag iron oxide content together with increased slag fluidity and a faster rate of lime dissolution to form a reactive slag.
Claims12
A slag conditioner for use in electric arc steelmaking, which conditioner comprises by weight:
- alumina--30 to 80%
- aluminium--10 to 30%
- fluorspar--5 to 40%
- and up to 20% by weight of alkali metal carbonate.
A slag conditioner for use in electric arc steelmaking, which conditioner comprises, by weight:
- alumina--30 to 80%
- aluminium--10 to 30%
- fluorspar--5 to 40%
- and up to 15% by weight of at least one oxide selected from alkaline earth metal oxide.
A slag forming agent comprising a slag conditioner for use in electric arc steelmaking, which conditioner comprises, by weight:
- alumina--30 to 80%
- aluminium--10 to 30%
- fluorspar--5 to 40%
- admixed with lime.
A method of making steel in an electric arc steelmaking furnace comprising the steps of deoxidising the steel and forming a slag by adding to the steel lime and a slag conditioner which comprises by weight:
- alumina--30 to 80%
- aluminium--10 to 30%
- fluorspar--5 to 40%.
Dependencies are inferred from the claim text.