Title:
METHOD FOR OPERATING ELECTRIC SMELTING FURNACE DECREASED IN ELECTRODE CONSUMPTION
Document Type and Number:
Japanese Patent JP3560677
Kind Code:
B2
Abstract:
PURPOSE: To subjecting various kinds of oxide raw materials, such as dust and sludge, to electric furnace refining while maintaining the voltage between an electrode and a furnace bottom in an adequate range.
CONSTITUTION: A tap voltage is increased or decreased in such a manner that the voltage (VT) between the electrode and the furnace bottom is kept in the range of 40 to 55V at the time of operating the electric smelting furnace to recover Ni-, Cr-contg. alloys by dissolving and reducing the oxide raw materials composed mainly of steel making dust and waste acid sludge. The supply rate of externally charged coke is so adjusted that the coke consumption unit attains ≤350kg/ton. The compounding of CaO and SiO2 contents is so adjusted as to maintain the basicity (BS) of the slag at 2.4 to 3.0. These controls are executed simultaneously in parallel. As a result, the electric furnace operation which maintains the high productivity and electric power efficiency and is decreased in electric power consumption is made possible.
Inventors:
Kenichi Katayama
Takashi Yamauchi
Akihiro Harada
Takashi Yamauchi
Akihiro Harada
Application Number:
JP9145095A
Publication Date:
September 02, 2004
Filing Date:
March 24, 1995
Export Citation:
Assignee:
Nisshin Steel Co., Ltd.
International Classes:
C22B4/04; C21B11/10; C22B7/04; (IPC1-7): C21B11/10; C22B4/04; C22B7/04
Domestic Patent References:
| JP8193212A |
Attorney, Agent or Firm:
Wataru Ogura
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