Title:
SMELTING REDUCTION METHOD FOR METAL OXIDE
Document Type and Number:
Japanese Patent JP2803558
Kind Code:
B2
Abstract:
PURPOSE: To provide a smelting reduction method of a metal oxide, by which the wear of a furnace refractory is restrained and the service life of the furnace refractory can be prolonged.
CONSTITUTION: Magnesia-containing material is added to slag and the temp. of molten iron is raised and also, the magnesia content in the slag is made higher than the saturated solubility by 1-20%, i.e., the solid magnesia-containing material is in existence in the slag through temp.raising and slag-making period for executing the slag-making at the initial stage, and smelting reductio period for charging and reducing the metal oxide. At the time of keeping the magnesia content in the slag within the super saturation range, elution of the magnesia from the furnace refractory is restrained and the erosion of the furnace refractory caused by the elution of the magnesia is greatly reduced. Further, in the temp. raising and slag-making period, since a quickly meltable material such as magnesia clinker is added as the magnesia source, the magnesia content can be kept in the saturated condition even in the temp.raising and slag-making period, and the wear of the furnace refractory is further reduced.
Inventors:
Nakamura Hideo
Miyato Yasuto
Shigeru Inoue
Hideaki Mizukami
Atsushi Watanabe
Kato Hisaki
Jiro Tanabe
Miyato Yasuto
Shigeru Inoue
Hideaki Mizukami
Atsushi Watanabe
Kato Hisaki
Jiro Tanabe
Application Number:
JP2959594A
Publication Date:
September 24, 1998
Filing Date:
February 28, 1994
Export Citation:
Assignee:
Nippon Steel Tube Co., Ltd.
International Classes:
C21B11/08; C21B11/00; C21B13/10; C21C5/36; C22B5/10; C22B23/02; (IPC1-7): C22B5/10; C21B11/00; C21C5/36; C22B23/02
Domestic Patent References:
| JP734144A |
Attorney, Agent or Firm:
Shigeru Takano