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US 8,673,047 B2Granted
Process for producing foamed slag
AssigneeSMS Siemag Aktiengesellschaft
InventorsJohann Reichel, Lutz Rose
Life of this patent
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Abstract
A process and material for producing foamed slag by which the foaming of a slag with a high chromium oxide content can be achieved. An electric arc furnace is charged with a mixture of metal oxides and carbon and, below the slag at the metal-slag interface, the metal oxide is reduced by carbon and limestone and becomes thermally discordant. The occurring gases cause the slag to foam due to the formation of bubbles.
Claims16
A process for producing a foamed slag on stainless steel melts in an electric arc furnace, comprising:
- charging the electric arc furnace with a mixture of metal oxides and carbon configured as a foamer;
- reducing the metal oxide by the carbon below a slag at a metal-slag interface;
- and
- foaming the slag due to a formation of bubbles by gases occurring due to the reducing,
- wherein the charge mixture is added in the form of molded articles comprising:
- 1) iron oxide in the form of at least one of Fe2O3 and Fe3O4 having a configuration selected from the group consisting of cinder, dry converter dust, dry EAF/LF electric arc furnace/ladle furnace dust, and converter wet dust;
- 2) at least one of coke, graphite, and carbon;
- and
- 3) ballast material comprising:
- for all stainless steel types, at least one of FeCr and ferritic scrap, or
- for stainless austenitic and duplex steel types, at least one of FeCr, ferritic scrap, austenitic scrap, duplex scrap, and nickel oxides (NiOx).
8 more elements
Dependencies are inferred from the claim text.