CN1178839A - Molten iron deslagging dephosphorizing technology - Google Patents
Molten iron deslagging dephosphorizing technology Download PDFInfo
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- CN1178839A CN1178839A CN 97109165 CN97109165A CN1178839A CN 1178839 A CN1178839 A CN 1178839A CN 97109165 CN97109165 CN 97109165 CN 97109165 A CN97109165 A CN 97109165A CN 1178839 A CN1178839 A CN 1178839A
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- slag
- molten iron
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- converter
- wash heat
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Abstract
The present invention relates to technology of dephosphorizing molten iron to produce low-phosphorus steel. Technologically, it features that by using steel ladle as deslagging ladle, molten iron is dephosphorized through nitrogen blowing stirring and low-phosphours moten iron is eparated from high-phosphorus slag and is blown in converter to produce low-phosphorus steel through slag-free steelmaking. The said technological process reduces phosphorus content from 0.1% to below 0.02%.
Description
The present invention relates to the pre-treatment of molten iron, particularly the dephosphorization technology of molten iron.
The low phosphoretic steel of dephosphorization of molten iron production is eldest child's difficult problem of smelting technology.
China's tradition dephosphorizing process is to carry out in converter, and its production efficiency is lower, and consumption of materials is big, the production cost height.
The SRP technology of SUMITOMO CHEMICAL metal industry company exploitation (simple refinery practice), adopt " two blow one " technology to match with a dephosphorization stove and a cover RH de-gassing vessel, carry out man-to-man serialization streamline operration, the smelting cycle of producing low phosphoretic steel shortens half, phosphorus content in the molten iron can be reduced to below 0.02% from 0.1%, flux saves 1/3rd, but also has complex process, investment is big, underuses weak points such as converter slag in latter stage sensible heat.Technical publications is referring to " Wakayama factory of Sumitomo Metal company builds novel steelshop of 21st century ", " metal Leader, the world " 1115 phases, 1996.9.30." adopt the steelshop of SRP new production process ", " metal Leader, the world ", 1126 phases, 1996.12.23.
The objective of the invention is to simplify SRP technology, design " molten iron deslagging takes off phosphine technology " that a kind of existing converter steelmaking workshop can both be adopted, this technology not only keeps the advantage of whole SRP technologies, also have reduce investment outlay, technology simply, grasp, be convenient to characteristics such as enforcement easily.
The crux of dephosphorization must satisfy thermodynamic condition, promptly carries out under low temperature, high basicity high oxidation slag condition.The present invention substitutes dephosphorization stove in the SRP technology with the ladle of routine as the wash heat bag, the liquid warm sludge of converter is poured in the wash heat bag, and added molten iron and carry out dephosphorization.This wash heat bag has bag end slide gate nozzle, is used for annotating iron to converter, and the high phosphorus slag after the wash heat is separated with low-phosphorous molten iron; Also have bag bottom blowing nitrogen system, liquid towards warm sludge, molten iron stir, and help dephosphorization and prevent that ' " accident takes place, again through " slag free tapping ", the low phosphoretic steel of " not having residual steel slag splashing " explained hereafter in big spray.
The present invention compared with prior art has following beneficial effect:
1, makes the wash heat bag with conventional ladle and substitute the dephosphorization stove, reduce investment outlay, be easy to carry out technological transformation and implement in existing converter mill;
2, make phosphorus content be reduced to below 0.02% the low phosphoretic steel of production from 0.1%;
3, deslagging dephosphorizing technology is simple, and operation is easily grasped;
4, adopt " not having residual steel slag splashing " technology, furnace service life is long;
5, adopt " annotating the sheet iron strip slag " technology, the metal loss amount is low, and waste work of treatment amount less and be convenient to comprehensive utilization;
6, adopt " slag free tapping " technology, tap is accurate, and yield of alloy is not only high but also accurate.
Embodiment established technology program and feature:
1, makes the wash heat bag with conventional ladle and substitute the dephosphorization stove, the capacity of wash heat bag is decided according to the liquid warm sludge amount of converter with to the iron water amount sum, the wash heat cylinder-packing is by the alkaline carbon fire resistant materials preparation of anti-high basicity slag and high-carbon iron water erosion, and wash heat is wrapped bag end slide gate nozzle and bag bottom blowing nitrogen system are set;
2, the wash heat bag is seated on the ladle transport trolley, comes and goes to run on to slag tap between position and the wash heat position, and the wash heat position is provided with dedusting and charging system;
3, the liquid warm sludge that will go up a converter is poured the wash heat bag into, again to hot metal charging, stir dephosphorization by bag bottom blowing nitrogen after, the high phosphorus slag separates with low-phosphorous molten iron;
4, behind the deslagging dephosphorizing, low-phosphorous molten iron is injected converter (allowing " annotating the sheet iron strip slag ") by slide gate nozzle at the bottom of the bag of wash heat bag;
5, the high phosphorus slag is poured into conventional slag ladle outward transport;
6, enter the low-phosphorous molten iron blowing of converter after, adopt " slag free tapping " technology, quantitatively produce low phosphoretic steel;
7, behind the converter tapping, remaining steel is drained (comprising a small amount of slag) by tap hole, behind employing " not having residual steel slag splashing " technology fettling, the slag that its complementary energy is discharged out of the furnace enters the wash heat bag;
8, carry out next stove " wash heat " schedule of operation.
Claims (2)
1, a kind of molten iron deslagging dephosphorizing technology, it is characterized in that getting the liquid warm sludge of a converter and add molten iron in the wash heat bag, carry out dephosphorization treatment by the nitrogen flushing stirring, the high phosphorus slag is separated with low-phosphorous molten iron, pour the high phosphorus slag into the slag ladle outward transport, low-phosphorous molten iron injects converter smelting, adopts the tapping of " slag free tapping " technology; Behind the converter tapping, the remaining steel that will have a small amount of slag by tap hole drains, and adopts " not having residual steel slag splashing " technology, and the slag that again its complementary energy is discharged out of the furnace enters the wash heat bag subsequently, carries out next slag wash-out phosphorus program.
2, molten iron deslagging dephosphorizing technology according to claim 1, it is characterized in that the wash heat bag makes with conventional ladle, its capacity is decided according to the liquid warm sludge amount of converter with to the iron water amount sum, the wash heat cylinder-packing is by the alkaline carbon fire resistant materials preparation of anti-high basicity slag and high-carbon iron water erosion, and wash heat is wrapped bag end slide gate nozzle and bag bottom blowing nitrogen system are set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97109165 CN1178839A (en) | 1997-07-17 | 1997-07-17 | Molten iron deslagging dephosphorizing technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97109165 CN1178839A (en) | 1997-07-17 | 1997-07-17 | Molten iron deslagging dephosphorizing technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1178839A true CN1178839A (en) | 1998-04-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97109165 Pending CN1178839A (en) | 1997-07-17 | 1997-07-17 | Molten iron deslagging dephosphorizing technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1178839A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105849024A (en) * | 2013-11-19 | 2016-08-10 | 通力股份公司 | Providing control commands to an elevator system with a personal terminal device |
-
1997
- 1997-07-17 CN CN 97109165 patent/CN1178839A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105849024A (en) * | 2013-11-19 | 2016-08-10 | 通力股份公司 | Providing control commands to an elevator system with a personal terminal device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |