Title:
METHOD FOR DESILICONIZING MOLTEN IRON
Document Type and Number:
Japanese Patent JP3680626
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To improve the siliconizing efficiency and also, to restrain the generation of a slag foaming at the desiliconizing treatment by receiving molten iron from a molten iron runner for blast furnace through a tilting trough in a molten iron receiving vessel and injecting a desiliconizing agent together with gas directly to the dropping stream.
SOLUTION: When a molten iron 4 is received into the molten iron receiving vessel 2 from the molten iron runner for blast furnace through the tilting trough, the desiliconizing agent 6 together with the carrier gas 5 are directly injected into the molten iron stream 3 from an injecting lance 1. At this time, since the desiliconized slag foaming is not generated, the siliconized slag 7 does not overflow from the vessels. The desiliconizing agent 6 is not especially restricted by using a solid oxygen supplying agent and this adding quantity is desirably about 5-20 kg/T-pig and the average grain diameter is made to about 4-1 mm from the view point of the restraint of foaming and the maintaining of desiliconizing efficiency in the molten iron receiving vessel 2. As the carrier gas 5, Ar gas or N2 gas is desirably used and the injecting pressure is made to 1.0-30 kgf/cm2.
Inventors:
Tatsuo Kobayashi
Application Number:
JP9875299A
Publication Date:
August 10, 2005
Filing Date:
April 06, 1999
Export Citation:
Assignee:
SUMITOMO METAL INDUSTRIES,LTD.
International Classes:
C21C1/04; (IPC1-7): C21C1/04
Domestic Patent References:
| JP11071608A | ||||
| JP61052312A | ||||
| JP2000144228A |
Attorney, Agent or Firm:
Shoichi Hirose