Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Reexamination Certificate
2008-01-10
2011-10-25
Wyszomierski, George (Department: 1733)
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
C075S010420, C075S010480, C075S010630
Reexamination Certificate
active
08043401
ABSTRACT:
During the production of stainless steel, a slag is formed during the melting of the solid material in the electric arc furnace, the slag having a high degree of metal oxides, particularly chromium oxide. The chromium concentration often reaches values of more than 30%. Currently, such slags cannot be reduced to a desired degree due to their composition. In order to minimize the resulting high loss of recyclable material, the invention provides to charge the electric arc furnace with pellets, or briquettes (8), which are made of a defined mixture of an iron carrier as the ballast material, carbon, or carbon and silicon, as the reducing agent, and a binder, wherein they react beneath the slag layer (7) in the steel melt (6) with the metal oxides of the slag (7), particularly with the chromium oxide present, in a floating, chemical, and reducing manner. The reaction gases (12) produced in the process, which are mainly made of carbon monoxide, advantageously support a foaming of the slag (7).
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Reichel Johann
Rose Lutz
Lucas & Mercanti LLP
McGuthry Banks Tima M
SMS Siemag Aktiengesellschaft
Stoffel Klaus P.
Wyszomierski George
LandOfFree
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