Title:
電気アーク炉中でのクロム含有量の多いスラグの還元方法
Document Type and Number:
Japanese Patent JP5094879
Kind Code:
B2
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).
More Like This:
Inventors:
Reichel Johann
Rose Lutz
Rose Lutz
Application Number:
JP2009548593A
Publication Date:
December 12, 2012
Filing Date:
January 10, 2008
Export Citation:
Assignee:
SMS G Mark Actien Gezel Shaft
International Classes:
C21C5/52; C21B13/12; C22B7/04; C22B34/32
Domestic Patent References:
| JP4701331B2 | ||||
| JP2002531706A | ||||
| JP61015912A | ||||
| JP62158812A | ||||
| JP2002088410A | ||||
| JP2002194449A | ||||
| JP2009525402A |
Attorney, Agent or Firm:
Mitsufumi Esaki
Blacksmith
Katsunori Uenishi
Blacksmith
Katsunori Uenishi