JPS57126904A - Control method for air-permeability of blast furnace - Google Patents
Control method for air-permeability of blast furnaceInfo
- Publication number
- JPS57126904A JPS57126904A JP1356481A JP1356481A JPS57126904A JP S57126904 A JPS57126904 A JP S57126904A JP 1356481 A JP1356481 A JP 1356481A JP 1356481 A JP1356481 A JP 1356481A JP S57126904 A JPS57126904 A JP S57126904A
- Authority
- JP
- Japan
- Prior art keywords
- furnace
- blast furnace
- softening
- charged
- permeability
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
Abstract
PURPOSE:To improve air-permeability in the softening and melting zone of a blast furnace, to make the flow of in-furnace gas smooth and to stabilize blast furnace operation, by executing one or more of the distribution control of material charged at the top of the furnace, the charge of prereduced ore and the injection of reducing gas. CONSTITUTION:The softening contraction ratio of minerals or the like to be charged to a blast furnace is detected by a temperature-raised load-softening test proximate to a reducing condition in the blast furnace. In addition, the reliability of a softening viscosity on a temperature and a prereducing ratio is detected on the basis of the measured contraction value of prereduced charged materials under an isothermal fixed load condition. A reducing ratio in a 1,000 deg.C (the initiation temperature of softening contraction)-zone in the furnace, preferably in the 1,000 deg.C-zone at the periphery in the range from the furnace wall to a position being 15% of the radius of the furnace, obtained from a reaction mechanism model in the blast furnace is controlled at a level higher by 10% or more than that at which a softening viscosity is the minimum. In this regard, the air-permeability of the blast furnace is improved by executing one or more of the distribution control of materials charged at the top of the furnace, the charge of prereduced minerals and the injection of reducing gas through a shaft part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1356481A JPS57126904A (en) | 1981-01-30 | 1981-01-30 | Control method for air-permeability of blast furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1356481A JPS57126904A (en) | 1981-01-30 | 1981-01-30 | Control method for air-permeability of blast furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57126904A true JPS57126904A (en) | 1982-08-06 |
Family
ID=11836657
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1356481A Pending JPS57126904A (en) | 1981-01-30 | 1981-01-30 | Control method for air-permeability of blast furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57126904A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10040138B2 (en) | 2011-02-24 | 2018-08-07 | Ceratizit Austria Gesellschaft M.B.H. | Cutting insert for machining |
-
1981
- 1981-01-30 JP JP1356481A patent/JPS57126904A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10040138B2 (en) | 2011-02-24 | 2018-08-07 | Ceratizit Austria Gesellschaft M.B.H. | Cutting insert for machining |
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