JPS5475418A - Hot iron dephosphorization method - Google Patents
Hot iron dephosphorization methodInfo
- Publication number
- JPS5475418A JPS5475418A JP14375577A JP14375577A JPS5475418A JP S5475418 A JPS5475418 A JP S5475418A JP 14375577 A JP14375577 A JP 14375577A JP 14375577 A JP14375577 A JP 14375577A JP S5475418 A JPS5475418 A JP S5475418A
- Authority
- JP
- Japan
- Prior art keywords
- slag
- hot iron
- iron
- furnace
- blowing
- 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
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
Abstract
PURPOSE:To refine a low phosphorus steel by preliminarily refining hot iron in a converter type dephosporization furnace; increasing the FeO content of slag; and sufficiently mixing the hot iron with the molten slag at a specific temp. with stirring to carry out decarburization and dephosphorization. CONSTITUTION:Hot iron is charged into a bottom blowing converter type dephosphorization furnace and subjected to oxygen blowing in the presence of slag with the ratio of CaO/SiO2=1.2-2.6 to carry out desiliconization and decarburization to about 2.8%. The blowing is then stopped, and an iron type coolant is charged into the furnace to regulate the FeO content of the slag to 10-30%. While adjusting the temp. of the hot iron to 1280-1450 deg.C, a non-oxidizing gas is blown from a nozzle at the furnace bottom. The hot iron and the molten slag are violently stirred with the blown gas, whereby the iron is decarburized with the FeO in the slag, and at the same time, P is oxidized and fixed in the slag as lime phosphate. Thus, a low phosphorus steel is manufactured easily.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14375577A JPS5475418A (en) | 1977-11-29 | 1977-11-29 | Hot iron dephosphorization method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14375577A JPS5475418A (en) | 1977-11-29 | 1977-11-29 | Hot iron dephosphorization method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5475418A true JPS5475418A (en) | 1979-06-16 |
Family
ID=15346257
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14375577A Pending JPS5475418A (en) | 1977-11-29 | 1977-11-29 | Hot iron dephosphorization method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5475418A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57137408A (en) * | 1981-02-17 | 1982-08-25 | Kawasaki Steel Corp | Dephosphorization treatment of molten iron |
| JPH02209410A (en) * | 1989-02-07 | 1990-08-20 | Nippon Steel Corp | Method for melting scrap in molten iron pre-treating furnace |
-
1977
- 1977-11-29 JP JP14375577A patent/JPS5475418A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57137408A (en) * | 1981-02-17 | 1982-08-25 | Kawasaki Steel Corp | Dephosphorization treatment of molten iron |
| JPS6356286B2 (en) * | 1981-02-17 | 1988-11-08 | Kawasaki Steel Co | |
| JPH02209410A (en) * | 1989-02-07 | 1990-08-20 | Nippon Steel Corp | Method for melting scrap in molten iron pre-treating furnace |
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