CN101358268A - Method for producing raw material pure iron by mother liquid carburization and VOD refine - Google Patents
Method for producing raw material pure iron by mother liquid carburization and VOD refine Download PDFInfo
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- CN101358268A CN101358268A CNA2008101965410A CN200810196541A CN101358268A CN 101358268 A CN101358268 A CN 101358268A CN A2008101965410 A CNA2008101965410 A CN A2008101965410A CN 200810196541 A CN200810196541 A CN 200810196541A CN 101358268 A CN101358268 A CN 101358268A
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- vod
- raw material
- mother liquor
- refining
- pure iron
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
A method for producing raw material pure iron by mother liquor recarburizing and VOD refining relates to the technical field of smelting, in particular to a production process for smelting pure iron with scrap steel as the raw material. The scrap steel is molten into mother liquor to be poured into a ladle, and the mother liquor is de-slagged to be placed in a VOD refining furnace. When the vacuum degree in the VOD refining furnace is 22500 to 25500Pa, oxygen is blown in for refining, then white lime, fluorite, aluminum particles and casi are added in the refining furnace and argon is blown in from the bottom part of the VOD refining furnace for refining, the waste gas produced by the reaction is removed after the reaction is completed. Then the vacuum is relieved, the refining furnace is lifted out of the vacuum tank and the molten steel is poured out for ingot casting when the molten steel temperature is 1590 to 1620 DEG C. The method is characterized in that highly carbonaceous recarbonizers are added in after the scrap steel is molten into the mother liquor. The invention has simple process, can effectively improve the temperature of the molten steel at the late stage of oxygen blowing and the purity of the finished steel.
Description
Technical field
The present invention relates to technical field of smelting, particularly a kind of production technique of making raw material raw materials for metallurgy pure iron with steel scrap.
Background technology
Pure iron as raw material is the important source material of producing magneticsubstance, electrical heating alloys, Precise Alloy and special metal material, that prior art mostly adopts is blast-melted, converter smelting or electrosmelting and by AOD refining furnace or VOD refining furnace smelting ferroferrite, because two kinds of methods are all higher to raw-material requirement, the input cost height of production unit, so, the applicant proposed a kind of novel process in 2007, saw the disclosure of number of patent application 200710023829.3.In this application, earlier steel scrap is melted in induction furnace, form mother liquor, in the VOD refining furnace, adopt vacuum system to carry out decarburization, dephosphorization, desulfurizing and refining again, at last again through die casting, stocking, this technical scheme is made raw material because of utilizing steel scrap, has reduced material cost, and facility investment is few and have the value of production application.But because the VOD smelting technology of pure iron as raw material and Precise Alloy is compared with stainless steel, there are not other elements participation oxidizing reactions such as chromium, under identical oxygen blast condition, deoxidation speed is fast, easier generation splash and excessive steel, the oxidizing reaction heat release is few, oxygen blast appears easily and after temperature low, cause refining to produce energy and strengthen at cost.Refining high-quality feedstocks pure iron is selected for use cold-reduced sheet to cut edge and is expected to make raw material, and its carbon content only is about 0.10%.The oxidation heat liberation of the main closing gold element of VOD refining improves liquid steel temperature, and main heat release unit have carbon, silicon, manganese, chromium etc.The VOD refining process, 2.36 ℃/min of oxygen blast average temperature rising.The requirement of refining process thermal equilibrium promptly will compensate because reduction period adds slag charge, cause temperature to reduce, and gassed out zone is walked heat under the high vacuum, guarantees that again tapping temperature is controlled at 1610 ℃ (± 10 ℃), has strict demand to oxygen blast later stage liquid steel temperature.
Summary of the invention
The object of the invention is to invent a kind of method for producing raw material pure iron by mother liquid carburization and VOD refine that can keep just producing steel temperature, raising Finished Steel purity.
The present invention becomes mother liquor to pour ladle into scrap melting, slagging-off is placed in the VOD refining furnace, when vacuum tightness is 22500～25500Pa in the VOD refining furnace, be blown into the oxygen refining, add lime, fluorite, aluminum shot, silico-calcium again, in reaching the blowing argon gas refining of VOD refining furnace bottom, bleed after reaction finishes to remove and react the waste gas that generates, then, remove vacuum, when liquid steel temperature is 1590～1620 ℃, work hanging out a jar ingot casting; It is characterized in that after scrap melting becomes mother liquor, adding high carbonaceous carburelant.
The present invention adds an amount of carburelant of carbon content more than 98% in the electrosmelting later stage, the mother liquor carbon content is brought up to more than 0.2% from 0.1%, thereby can be dropped to 1680 ℃ to first furnace tapping temperature by 1720 ℃.Promptly created good thermal conditions, overcome again in acid lined furnace along with furnace temperature rising SiO to oxygen blast dephosphorization under the low temperature
2Become big after the decomposition gradually, and SiO takes place
2Reduction causes and increases silicon.Technology of the present invention is simple, can effectively improve the liquid steel temperature in oxygen blast later stage, can effectively improve the purity of finished steel.
In order to improve effect, carbon containing quality 〉=98% in the carburelant of the present invention.
In addition, mother liquor carbon content 〉=0.2% behind the adding carburelant.
Embodiment
Concrete steps:
1, raw materials for production cold rolled sheet iron side cut material is carried out analytical test, use the batching back.
2, in induction furnace, raw material adopted about Frequency Induction Heating to 1700 ℃, form mother liquor.
3, add the carburelant of carbonaceous amount 〉=98% after scrap melting becomes mother liquor, making the mother liquor carbon content is more than 0.2%.
4, the scum silica frost on the removal mother liquor.
5, the mother liquor that removes slag is placed in the VOD refining furnace.
6, open vacuum pump, when vacuum tightness is 22500～25500Pa in the VOD refining furnace, be blown into the oxygen refining 8～10 minutes.
7, extract waste gas, making the interior vacuum tightness of VOD refining furnace is 250～280Pa, 4～6 minutes time.
8, add lime, fluorite, aluminum shot, silico-calcium, in reaching VOD refining furnace bottom blowing argon gas refining 25～40 minutes.
9, remove vacuum, the liquid steel temperature that goes out jar is 1610 ± 10 ℃.
Claims (3)
1, method for producing raw material pure iron by mother liquid carburization and VOD refine, become mother liquor to pour ladle into scrap melting, slagging-off is placed in the VOD refining furnace, when vacuum tightness is 22500～25500Pa in the VOD refining furnace, be blown into the oxygen refining, add lime, fluorite, aluminum shot, silico-calcium again, in reaching the blowing argon gas refining of VOD refining furnace bottom, bleed after reaction finishes and remove the waste gas that reaction generates, then, remove vacuum, when liquid steel temperature is 1590～1620 ℃, work hanging out a jar ingot casting; It is characterized in that after scrap melting becomes mother liquor, adding high carbonaceous carburelant.
2,, it is characterized in that carbon containing quality 〉=98% in the described carburelant according to the described method for producing raw material pure iron by mother liquid carburization and VOD refine of claim 1.
3,, it is characterized in that adding mother liquor carbon content 〉=0.2% behind the carburelant according to the described method for producing raw material pure iron by mother liquid carburization and VOD refine of claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101965410A CN101358268A (en) | 2008-09-10 | 2008-09-10 | Method for producing raw material pure iron by mother liquid carburization and VOD refine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101965410A CN101358268A (en) | 2008-09-10 | 2008-09-10 | Method for producing raw material pure iron by mother liquid carburization and VOD refine |
Publications (1)
| Publication Number | Publication Date |
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| CN101358268A true CN101358268A (en) | 2009-02-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008101965410A Pending CN101358268A (en) | 2008-09-10 | 2008-09-10 | Method for producing raw material pure iron by mother liquid carburization and VOD refine |
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| CN (1) | CN101358268A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101993973A (en) * | 2009-08-10 | 2011-03-30 | 鞍钢股份有限公司 | Method for producing high-purity pure iron |
-
2008
- 2008-09-10 CN CNA2008101965410A patent/CN101358268A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101993973A (en) * | 2009-08-10 | 2011-03-30 | 鞍钢股份有限公司 | Method for producing high-purity pure iron |
| CN101993973B (en) * | 2009-08-10 | 2013-05-01 | 鞍钢股份有限公司 | Method for producing high-purity pure iron |
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Open date: 20090204 |