CN101078033A - Technique for smelting raw material ferroferrite from waste steel - Google Patents
Technique for smelting raw material ferroferrite from waste steel Download PDFInfo
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- CN101078033A CN101078033A CNA2007100238293A CN200710023829A CN101078033A CN 101078033 A CN101078033 A CN 101078033A CN A2007100238293 A CNA2007100238293 A CN A2007100238293A CN 200710023829 A CN200710023829 A CN 200710023829A CN 101078033 A CN101078033 A CN 101078033A
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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
This invention relates to a method of smelt pure iron using scrap steel as raw material, which belongs to the ferrous metal smelting area. There are two improvements to current iron smelt technology. One is using scrap steel as raw material which could decrease the cost. Another is the utilization of the technology of vacuum oxygen blowing and vacuum carbon-deoxidization and adding residue with bottom argon blowing. The equipment investment of this invention is low and the technique index not only could reach the national standard but also could meet the special need of the consumer. It possesses a very good social benefit and economic benefit.
Description
Technical field
The present invention relates to a kind ofly make the technology of raw material raw materials for metallurgy pure iron, belong to the black metal smelting technology field with steel scrap.
Background technology
Pure iron as raw material is the important source material of producing magneticsubstance, electrical heating alloys, Precise Alloy, special metal material, the raw materials for metallurgy pure iron adopts blast-melted both at home and abroad now, smelt by inferior oxygen refining furnace of AOD or VOD refining furnace, starting material are required high, investment of production equipment is big, some domestic large enterprises throw huge fund for the needs that satisfy self production associated metal material and build production line raw materials for metallurgy pure iron, and some other enterprise needs pure iron as raw material considerable part dependence on import.Can utilize steel scrap and relevant device raw materials for metallurgy pure iron, satisfy the demand of domestic market on the one hand, turn waste into wealth by utilizing a large amount of steel scraps to reach on the other hand pure iron as raw material.
Summary of the invention
The purpose of this invention is to provide a kind of technology of making raw material raw materials for metallurgy pure iron with steel scrap, adopt present situation blast-melted and that investment of production equipment is big at existing domestic and international raw materials for metallurgy pure iron, product can not satisfy the demands and the deficiency of dependence on import, with less investment and equipment, realize raw materials for metallurgy pure iron from steel scrap.
The objective of the invention is to be achieved through the following technical solutions, a kind of technology of making raw material raw materials for metallurgy pure iron with steel scrap, comprise die casting, stocking, it is characterized in that described technology comprises successively also that before die casting the steel scrap that apolegamy is good melts mother liquor at induction furnace, carries out decarburization, dephosphorization, desulfurizing and refining in the VOD refining furnace.
Described steel scrap is a cold rolled sheet side cut material.
Described induction furnace fusing mother liquor adopts medium-frequency induction furnace, fusing time: 1-1.5 hour, 1650-1750 ℃ of mother liquor tapping temperature.
Described VOD refining furnace has the vacuum tank of vacuum system.
Described induction furnace fusing mother liquor is blended in Bao Wenwei 850-950 ℃ the VOD ladle, on stay the part headroom, after the ladle that tilts is thereafter skimmed, the VOD ladle is inserted in the vacuum tank, when vacuum tightness reaches 170-190Torr in the jar, beginning oxygen blast refining, oxygen blow duration is 5-15 minute; Add slag charge and the refining of reductor BOTTOM ARGON BLOWING again, it is 20-45 minute that Argon stirs refining time; Stop oxygen blast and the thermometric of taking a sample after, about gas clean-up 0.8-1.2Torr, carry out vacuum carbon deoxidization immediately; Stop to vacuumize, abolish vacuum, measure liquid steel temperature at 1550-1650 ℃ of lifting ingot casting.
Adding slag charge and the refining of reductor BOTTOM ARGON BLOWING adds lime, fluorite, aluminium block and silico-calcium piece by loading hopper, is benchmark with 25 tons of capacity VOD refining furnaces, and above-mentioned material proportioning is 1: 0.23: 0.23: 0.043.
The present invention is to the improvement of existing raw materials for metallurgy pure iron technology both at home and abroad, one of improvement is to utilize steel scrap, not only reduced raw-material cost, and turn waste into wealth, two of improvement is because of raw-material variation, employing is carried out oxygen blast dephosphorization under the vacuum condition, vacuum carbon deoxidization, is added slag charge BOTTOM ARGON BLOWING desulfurizing and refining in vacuum system with through the VOD refining furnace, the present device less investment, the every technical indicator of pure iron as raw material of smelting can not only meet national standard, and can also satisfy some users' special requirement, have high economic benefit and social benefit.
Embodiment
Further specify the present invention in conjunction with the embodiments, the present invention utilizes the scrap smelting pure iron as raw material, its technology comprise successively apolegamy material, induction furnace fusing mother liquor, in vacuum system and vacuum tank after the VOD refining furnace carries out refining, through die casting, stocking, check is at last dispatched from the factory.
The apolegamy material is started with from purchasing pure raw material, the control foreign matter content.The iron charge that is used for the raw materials for production pure iron at present all is the cold rolled sheet side cut material of outsourcing, carries out sample examination after marching into the arena earlier, and smelting can feed intake after meeting the requirements.
Induction furnace fusing mother liquor adopts 12 tons of medium-frequency induction furnaces of capacity, the heating molten steel temperature can reach 1550-1800 ℃, smelting time: 1-1.5 hour, 12 tons of anti-material crucible size of capacity medium-frequency induction furnace: Φ 1220mm suitable for reading, 1050mm at the bottom of the Φ, degree of depth 1850mm, initial Intake Quantity are 12 tons, and the later stage can be adorned the 16-17 ton;
VOD refining furnace vacuum system and vacuum tank, vacuum system comprise 5 grades of vapor jet pumps (5 grades of main pumps, 2 grades of service pumps, 1 grade of ejector priming), exhaust capacity～150Kg/hr (under the 67Pa), final vacuum can reach 0.5Torr, about 150-60Torr, carry out the oxygen blast refining, about 10 minutes of time; Vacuum tank diameter 3536mm, vacuum tank height 4200mm, vacuum container cover diameter 3700mm.
The smelting technology process, induction furnace fusing mother liquor, time 1-1.5 hour, the mother liquor tapping temperature was 1650-1750 ℃, chemical ingredients requires: about C0.1%, Si≤0.10%, P≤0.015%, S≤0.030%, Mn≤0.15%, Cr, Ni≤0.10%;
Mother liquor is blended into VOD refining furnace (magnesia chrome brick block ladle), Bao Wen 〉=900 ℃, inject mother liquor after, on stay headroom 350-700mm;
Slagging-off, after mother liquor was blended into ladle, the inclination ladle was manually skimmed, all refining slag Ex-alls just, total analysis is carried out in sampling simultaneously;
The VOD refining furnace is gone into jar, and before the VOD refining furnace enters vacuum tank 5-10 minute, water pump and boiler began to start, and prepare air feed; After closing main stop valve and opening each water discharge valve, the beginning draining is opened the steam main valve after about 1 minute, drive vacuum pumps at different levels again, begin to take out preliminary vacuum, after vacuum tightness reaches 250Torr, ladle enters vacuum tank, connects BOTTOM ARGON BLOWING thermometric and measurement overhead clearance afterwards, builds vacuum cover then conscientiously.
The oxygen blast refining, when vacuum tightness in the jar reaches the 180Torr left and right sides, beginning oxygen blast refining, about oxygen pressure 0.8MPa, oxygen rifle height 1-1.2 meter, general oxygen blow duration is 8-10 minute, when finding that little oxygen electromotive force obviously descends, vacuum tightness obviously raises simultaneously, and after the spent air temperture balance, can stop oxygen blast.
Add the refining of slag charge BOTTOM ARGON BLOWING, finish substantially after the vacuum carbon deoxidization, promptly add 80 kilograms in lime 300-350 kilogram, fluorite, and add 80 kilograms of aluminium blocks, silico-calcium piece 15-20 kilogram by loading hopper, continue BOTTOM ARGON BLOWING and stir refining, it is 25-40 minute that general Argon stirs refining time;
Vacuum carbon deoxidization, stop oxygen blast and the thermometric of taking a sample after, gas clean-up (about 1Torr) is carried out vacuum carbon deoxidization immediately;
Stopping to vacuumize, should possess following condition, can stop to vacuumize 1) electromotive force of little oxygen analyzer begins to descend; 2) spent air temperture obviously descends; 3) vacuum tightness rises, and the limit reaches about 0.5Torr;
Abolish vacuum, open cover, hang out after the little clad, measure liquid steel temperature, require to lift by crane ingot casting at 1590-1600 ℃.
(1) the vacuum refinement dephosphorization under the low Si condition of the low C of the present invention, the vacuum condition of VOD and oxygen blown oxidizing atmosphere, created favourable thermodynamics and kinetics condition to dephosphorization: under higher vacuum condition, can be with dephosphorisation reaction 4P+5O
2-2P
2O
5Reaction product P
2O
5Directly get rid of from gas phase, thereby help the carrying out of dephosphorisation reaction greatly, dephosphorization rate is 25-50% generally speaking, reaches as high as 60.5% (being reduced to 0.006% from original content 0.016%);
(2) vacuum C of the present invention is taken off O, after stopping oxygen supply, and take a sample, after the thermometric, be gas clean-up, when vacuum tightness reaches the 1Torr left and right sides, utilize the C-O profile of equilibrium under the vacuum condition to move down, rely on C and O reaction in the molten steel, form CO and from gas phase, get rid of;
(3) add the slag charge BOTTOM ARGON BLOWING and stir refining, after stopping oxygen supply, promptly add 80 kilograms in lime 300-350 kilogram, fluorite by reinforced hopper, and 80 kilograms of bulk deoxidation agent aluminium blocks, silico-calcium piece 15-20 kilogram, Argon 5-7 minute, carry out refining; Main purpose is to utilize high basicity slag and reducing atmosphere, carries out desulfurization, and desulfurization degree is generally about 20-50%.
Claims (6)
1, a kind of technology of making raw material raw materials for metallurgy pure iron with steel scrap, comprise die casting, stocking, it is characterized in that described technology comprises successively also that before die casting the steel scrap that apolegamy is good melts mother liquor at induction furnace, carries out decarburization, dephosphorization, desulfurizing and refining in the VOD refining furnace.
2, according to claim 1ly make the technology of raw material raw materials for metallurgy pure iron, it is characterized in that described steel scrap is the cold rolled sheet material of cutting edge with steel scrap.
3, according to claim 1ly make the technology of raw material raw materials for metallurgy pure iron, it is characterized in that described induction furnace fusing mother liquor adopts medium-frequency induction furnace, fusing time 1-1.5 hour, 1650-1750 ℃ of mother liquor tapping temperature with steel scrap.
4, according to claim 1ly make the technology of raw material raw materials for metallurgy pure iron, it is characterized in that described VOD refining furnace has the vacuum tank of vacuum system with steel scrap.
5, the technology of making raw material raw materials for metallurgy pure iron with steel scrap according to claim 1, it is characterized in that described induction furnace fusing mother liquor is blended in Bao Wenwei 850-950 ℃ the VOD ladle, on stay the part headroom, thereafter after the ladle that tilts is skimmed, the VOD ladle is inserted in the vacuum tank, when vacuum tightness reaches 170-190Torr in the jar, beginning oxygen blast refining, oxygen blow duration is 5-15 minute; Add slag charge and the refining of reductor BOTTOM ARGON BLOWING again, it is 20-45 minute that Argon stirs refining time; Stop oxygen blast and the thermometric of taking a sample after, about gas clean-up 0.8-1.2Torr, carry out vacuum carbon deoxidization immediately; Stop to vacuumize, abolish and measure liquid steel temperature after the vacuum at 1550-1650 ℃ of lifting ingot casting.
6, the technology of making raw material raw materials for metallurgy pure iron with steel scrap according to claim 5, it is characterized in that adding slag charge and the refining of reductor BOTTOM ARGON BLOWING, both added lime, fluorite, aluminium block and silico-calcium piece by loading hopper, with 25 tons of capacity VOD refining furnaces is benchmark, and above-mentioned material proportioning is 1: 0.23: 0.23: 0.043.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100238293A CN101078033A (en) | 2007-06-19 | 2007-06-19 | Technique for smelting raw material ferroferrite from waste steel |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007100238293A CN101078033A (en) | 2007-06-19 | 2007-06-19 | Technique for smelting raw material ferroferrite from waste steel |
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| CN101078033A true CN101078033A (en) | 2007-11-28 |
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| CNA2007100238293A Pending CN101078033A (en) | 2007-06-19 | 2007-06-19 | Technique for smelting raw material ferroferrite from waste steel |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102337370A (en) * | 2011-10-26 | 2012-02-01 | 沈阳博联特熔融还原科技有限公司 | Device and method for smelting industrial pure iron |
| CN103333993A (en) * | 2013-07-11 | 2013-10-02 | 武汉钢铁(集团)公司 | Dephosphorizing method of vacuum induction furnace |
| CN103397131A (en) * | 2013-08-11 | 2013-11-20 | 山西太钢不锈钢股份有限公司 | Pure iron smelting method |
| CN106555030A (en) * | 2016-12-06 | 2017-04-05 | 上海宏钢电站设备铸锻有限公司 | The ladle of vacuum-oxygen decarbonizing stove is slagged tap the method for toppling over |
| CN109355551A (en) * | 2018-12-10 | 2019-02-19 | 攀枝花钢城集团有限公司 | A kind of production method of vanadium iron |
| CN113136476A (en) * | 2021-04-25 | 2021-07-20 | 新余华峰特钢有限公司 | Slag-removing smelting method for waste steel |
-
2007
- 2007-06-19 CN CNA2007100238293A patent/CN101078033A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102337370A (en) * | 2011-10-26 | 2012-02-01 | 沈阳博联特熔融还原科技有限公司 | Device and method for smelting industrial pure iron |
| CN102337370B (en) * | 2011-10-26 | 2013-05-01 | 辽宁博联特冶金科技有限公司 | Device and method for smelting industrial pure iron |
| CN103333993A (en) * | 2013-07-11 | 2013-10-02 | 武汉钢铁(集团)公司 | Dephosphorizing method of vacuum induction furnace |
| CN103397131A (en) * | 2013-08-11 | 2013-11-20 | 山西太钢不锈钢股份有限公司 | Pure iron smelting method |
| CN103397131B (en) * | 2013-08-11 | 2015-02-25 | 山西太钢不锈钢股份有限公司 | Pure iron smelting method |
| CN106555030A (en) * | 2016-12-06 | 2017-04-05 | 上海宏钢电站设备铸锻有限公司 | The ladle of vacuum-oxygen decarbonizing stove is slagged tap the method for toppling over |
| CN109355551A (en) * | 2018-12-10 | 2019-02-19 | 攀枝花钢城集团有限公司 | A kind of production method of vanadium iron |
| CN113136476A (en) * | 2021-04-25 | 2021-07-20 | 新余华峰特钢有限公司 | Slag-removing smelting method for waste steel |
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