CN1255558C - Production technology for melting steel by electric arc furnace converter - Google Patents
Production technology for melting steel by electric arc furnace converter Download PDFInfo
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- CN1255558C CN1255558C CNB2004100415025A CN200410041502A CN1255558C CN 1255558 C CN1255558 C CN 1255558C CN B2004100415025 A CNB2004100415025 A CN B2004100415025A CN 200410041502 A CN200410041502 A CN 200410041502A CN 1255558 C CN1255558 C CN 1255558C
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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
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Abstract
The present invention relates to producing technology for smelting steel by an electric arc furnace in a converter type, particularly to the producing technology using an electric arc furnace for the steel smelting operation in a converter type under the condition that the electric energy is not sufficiently supplied, which has the advantages of low electric consumption and high molten iron loading proportion, particularly the producing purpose of using a low-voltage level, an oxygen blowing and charging system for using the electric arc furnace to smelt the steel in a converter type under the condition that the electric energy is not sufficiently supplied is realized. The present invention realizes the purpose of the present invention by adjusting a furnace material mixing and loading system, an oxygen supplying system, a slag producing system, an electric supplying system, a steel producing system and other work procedures. The technology has the obvious advantage that the electric furnace can still maintain the normal production under an electrotonus or electric cut-off condition, and the production can not be stopped by that the electricity is cut off. In addition, a great amount of molten iron has low impurity absorption, and the molten iron ratio is higher than 55%. Thus, the residual elements in molten steel are greatly reduced, and an excellent condition is provided for the electric furnace to smelt the steel of which the residual element requirements are low. The present invention has the advantages of low electric consumption, low electrode consumption and high economic benefit.
Description
Technical field
The present invention is a kind of electric arc furnace converter steel making production process, especially under the under-supply situation of electric energy, utilizes electric arc furnace to carry out converter steel making operation production technique, relates to the smelting iron and steel technical field.
Background technology
Under the well-off situation of electric energy, the production technique of electric arc furnace smelting steel commonly used comprises that furnace charge packs into, power supply, oxygen supply, slag making, production processes such as tapping, based on the cold charge production technique, burden structure is aided with the pig iron based on steel scrap, scrap iron, mild steel, metal charges such as sponge iron, the steel scrap furnace charge divides in 2～3 stoves of packing into, after cloth finishes, insert electrode, can be after a defective material be worn well 2-3 minute, the bell of outwarding winding, add the 20-35t molten iron, the electrifying electrodes melting batch uses high-voltage progression, big electric current power supply, and auxiliary oxygen blast, treat steel scrap and molten iron molten clear after, add the secondary steel scrap, again energising, and auxiliary oxygen blast, in fusion process, add slag former, when tapping temperature and carbon, phosphorus, when Chemical Composition content such as alloying element meet the requirements, can tap, carry out external refining then.Traditional ultra-high power electric arc furnace, conduction time is long, generally about 35 minutes, and through after a while blowing.
The production technique that a kind of new ultra-high power electric arc furnace is smelted steel has appearred now, be exactly in electric furnace, to add a certain proportion of hot metal charge, iron water amount is less, ratio is generally 30～50%, the molten iron system of packing into is disposable packing into, and the melting thermal source is based on electrode power supply, auxiliary oxygen blast, the electrode power supply time, other method with traditional electric arc furnace smelting steel was identical generally about 20～40 minutes.The characteristics of this production technique commonly used are that current consumption is big, and the steel scrap usage quantity is big, and consumption of electrode is big.
Summary of the invention:
Goal of the invention: the big electric arc furnace converter steel making production process of ratio that the object of the present invention is to provide that a kind of current consumption is little, molten iron is packed into, particularly under the under-supply situation of electric energy, utilize small voltage progression, oxygen blast and charging system to realize the production purpose of electric arc furnace converter steel making.
For achieving the above object, the technical scheme of electric arc furnace converter steel making production process provided by the invention is:
A kind of electric arc furnace converter steel making production process comprises the furnace charge batching and the system of packing into, oxygen supply system, slagging regime, power supply system, tapping system, and its particular content is as follows:
The furnace charge batching and the system of packing into: the molten iron ratio is 55～70% in the burden structure, and packing into of steel scrap amount determined with the iron water amount ratio; Charging stock for electric furnace charging order is a defective material, molten iron, secondary molten iron, two defective materials.
Oxygen supply system: one time molten iron adds the back oxygen supply, based on the furnace wall rifle, controls total oxygen-supplying amount≤600m
3The secondary molten iron adds the main oxygen rifle in back to be not more than 65m
3The flow of/min, furnace wall rifle allow the flow oxygen supply with maximum, and when finding that splash is big, main oxygen rifle should stop oxygen supply immediately; After two defective materials add, all available maximum flow oxygen supply that allows of main oxygen rifle and furnace wall rifle, bell could oxygen supply after falling the position.
Slagging regime: before adding a defective material, add packed lime in the electric furnace earlier; When adding furnace charge, add packed lime simultaneously at every turn.
Power supply system: under the under-supply situation of electric energy, heat up in electric furnace blowing later stage such as need power supply, under the prerequisite of confirming the refining furnace outage, use the small power power supply only, power supply intensity＜10000KW, power-on time＜10 minute show through test, best power-on time is at 3-8 minute, and guarantees that tapping temperature is not more than 1680 ℃.Electric furnace and refining furnace can not be powered simultaneously, to guarantee to be no more than given maximum power load.
The tapping system: during tapping, Fe-Si ferro-silicon reductor in the ladle; In the tapping process if the molten steel boiling phenomenon can add ferroaluminium Fe-Al in electric furnace.
Described charging system is meant that a defective material all allocates the frivolous material in the 20-25% left and right sides into, and two defective materials are allocated the frivolous material in the 5-10% left and right sides into, and the steel scrap that other adds about 5-10% is pulverized material, and specification is＜Φ 150mm bulk density＞4t/m
3,, avoid binder to improve bulk density.Bag is annotated surplus, briquetting and the bigger heavy scrap of shearing material equidimension in can not using.The maximum of described each oxygen rifle allows flow to be: main oxygen rifle flow≤80m
3/ min; Furnace wall rifle (Moudle rifle) is opened under manual mode, and flow can omnidistancely use 25m
3/ min; Auxiliary little oxygen rifle flow≤15m
3/ min.
Described slagging regime when feeding in raw material, expects that at every turn the bottom of basket need add packed lime in electric furnace, every bag of amount is 1 ton/bag; In converting process as find that slag is rare excessively, basicity＜2.0 o'clock can add the residue adjustment of 100～150kg magnesium ball at every turn.
Beneficial effect: the invention provides a kind of the power supply substantially or a small amount of low voltage progression power supply and mainly with oxygen blowing master's electric furnace smelting process, this technology great advantage is still can keep ordinary production in electrotonus or powering-off state electric furnace, be unlikely to because of power failure stops production, economic benefit is very huge.Another advantage is that owing to eat the very low molten iron of impurity in a large number, hot metal ratio reaches more than 55%, makes that residual element greatly reduce in the molten steel, has created good condition for the electrosmelting residual element require lower steel grade.It is low that the present invention also has current consumption, the characteristics that consumed electrode is little.
Embodiment
The present invention is further illustrated below in conjunction with embodiment.
Embodiment 1: utilize production technique provided by the invention to carry out the smelting of 20# tube blank steel.
Electric arc furnace is 100 tons of ultra-high power electric arc furnaces, and the molten iron ratio is 60% in the burden structure, and furnace charge charging order is steel scrap, molten iron, secondary molten iron, secondary steel scrap.One time steel scrap is all allocated about 30 tons in frivolous material into, and two defective materials are allocated 10 tons of frivolous material in the left and right sides into, and other adds pulverizing material about 10 tons, and specification is＜Φ 150mm bulk density＞4t/m
3,, avoid binder to improve bulk density.Bag is annotated surplus, briquetting and the bigger heavy scrap of shearing material equidimension in can not using.
Oxygen supply system: one time molten iron adds the back oxygen supply, based on the furnace wall rifle, controls total oxygen-supplying amount≤600m
3It is 65m that the secondary molten iron adds the main oxygen rifle flow in back
3/ min, the furnace wall rifle allows the flow oxygen supply with maximum, and promptly the Moudle rifle is opened under manual mode, and flow can omnidistancely use 25m
3/ min finds that splash is bigger, and main oxygen rifle should stop oxygen supply immediately; After two defective materials add, all available maximum flow oxygen supply that allows of main oxygen rifle and furnace wall rifle, main oxygen rifle flow is 80m
3/ min, auxiliary little oxygen rifle flow 12m
3/ min.Oxygen supply must be after bell be fallen the position.
Slagging regime: before adding a defective material, add two tons of packed lime in the stove earlier; When in electric furnace, feeding in raw material, expect that at every turn the bottom of basket need add two tons of packed lime.In converting process as find that slag is rare excessively, basicity＜2.0 o'clock can add the residue adjustment of 100-150kg magnesium ball at every turn.
Power supply system: under the under-supply situation of electric energy, blowing later stage such as need power supply heat up, during if ration the power supply, under the prerequisite of confirming the refining furnace outage, use 12 step voltage progression, No. 4 current curve power supplies only, output power is less than 10000KW, and power-on time 3-5 minute, and guarantee that tapping temperature is not more than 1680 ℃.Electric furnace and refining furnace can not be powered simultaneously, to guarantee to be no more than given maximum power load.
Tapping system: during tapping, forbid to add deoxidizing slag-forming agents such as Si-C in the ladle, carry out deoxidation but add Fe-Si ferro-silicon 200kg, in the tapping process if the molten steel boiling phenomenon, can in electric furnace, add ferroaluminium Fe-Al50-100kg, add silicomanganese 200kg behind the stove.
Through smelting after a while, go out qualified molten steel, enter crystallizer and carry out strand.
Embodiment 2: utilize the present invention to smelt the 45# steel.
Electric arc furnace is 100 tons of ultra-high power electric arc furnaces, and the molten iron ratio is 65% in the burden structure, and furnace charge charging order is steel scrap, molten iron, secondary molten iron, secondary steel scrap.One time steel scrap is all allocated about 25 tons in frivolous material into, and two defective materials are allocated 10 tons of frivolous material in the left and right sides into, and other adds 10 tons of left and right sides imports and pulverizes material, and specification is＜Φ 150mm bulk density＞4t/m
3,, avoid binder to improve bulk density.Bag is annotated surplus, briquetting and the bigger heavy scrap of shearing material equidimension in can not using.
Oxygen supply system: one time molten iron adds the back oxygen supply, based on the furnace wall rifle, controls total oxygen-supplying amount≤600m
3It is 65m that the secondary molten iron adds the main oxygen rifle flow in back
3/ min, the furnace wall rifle allows the flow oxygen supply with maximum, and promptly the Moudle rifle is opened under manual mode, and flow can omnidistancely use 25m
3/ min finds that splash is bigger, and main oxygen rifle should stop oxygen supply immediately; After two defective materials add, all available maximum flow oxygen supply that allows of main oxygen rifle and furnace wall rifle, main oxygen rifle flow is 80m
3/ min, auxiliary little oxygen rifle flow 12m
3/ min.Oxygen supply must be after bell be fallen the position.
Slagging regime: before adding a defective material, add two tons of packed lime in the stove earlier; When in electric furnace, feeding in raw material, expect that at every turn the bottom of basket need add two tons of packed lime.In converting process as find that slag is rare excessively, basicity＜2.0 o'clock can add the residue adjustment of 100-150kg magnesium ball at every turn.
Power supply system: under the under-supply situation of electric energy, blowing later stage such as need power supply heat up, during if ration the power supply, under the prerequisite of confirming the refining furnace outage, use 12 step voltage progression, No. 4 current curve power supplies only, output power is less than 10000KW, and power-on time 5-8 minute, and guarantee that tapping temperature is not more than 1680 ℃.Electric furnace and refining furnace can not be powered simultaneously, to guarantee to be no more than given maximum power load.
Tapping system: during tapping, forbid to add deoxidizing slag-forming agents such as Si-C in the ladle, carry out deoxidation but add Fe-Si ferro-silicon 200kg, in the tapping process if the molten steel boiling phenomenon, can in electric furnace, add ferroaluminium Fe-Al50-100kg, add silicomanganese 200kg behind the stove.
Through smelting after a while, go out qualified molten steel, enter crystallizer and carry out strand.
Claims (7)
1, a kind of electric furnace to converter steel making production process comprises furnace charge batching and the system of packing into, oxygen supply system, slagging regime, power supply system and tapping system, it is characterized in that:
The furnace charge batching and the system of packing into: the molten iron ratio is 55～70% in the burden structure, and packing into of steel scrap amount determined with the iron water amount ratio; Charging stock for electric furnace charging order is steel scrap, molten iron, secondary molten iron, secondary steel scrap;
Oxygen supply system: one time molten iron adds the back oxygen supply, based on the furnace wall rifle, controls total oxygen-supplying amount≤600m
3The secondary molten iron adds the main oxygen rifle in back to be not more than 65m
3The flow oxygen supply of/min, the furnace wall rifle allows the flow oxygen supply with maximum, and when finding that splash is big, main oxygen rifle should stop oxygen supply immediately; After the adding of two defective materials, all available maximum flow oxygen supply that allows of main oxygen rifle and furnace wall rifle, bell is fallen position ability oxygen supply afterwards, utilizes auxiliary little oxygen oxygen supply simultaneously;
Slagging regime: before adding a defective material, add packed lime in the electric furnace earlier; When adding furnace charge, add packed lime simultaneously at every turn;
Power supply system: under the under-supply situation of electric energy, electric furnace blowing later stage power supply heats up, under the prerequisite of confirming the refining furnace outage, the power supply of use small power, power supply intensity＜10000KW, power-on time＜10 minute, and guarantee that tapping temperature is not more than 1680 ℃, electric furnace and refining furnace be power supply simultaneously;
Tapping system: during tapping, add Fe-Si ferro-silicon reductor in the ladle; When occurring the molten steel boiling phenomenon in the tapping process, in electric furnace, add ferroaluminium Fe-Al.
2, electric furnace to converter steel making production process as claimed in claim 1 is characterized in that: the described furnace charge system of packing into is meant that a defective material all allocates the frivolous material of 20-25% into, and two defective materials are allocated the frivolous material of 5-10% into, and other adds the steel scrap of 5-10% and pulverizes material.
3, electric furnace to converter steel making production process as claimed in claim 1 is characterized in that: the maximum of described each oxygen rifle allows flow to be: main oxygen rifle flow≤80m
3/ min; The furnace wall rifle is opened under manual mode, the omnidistance 25m that uses of flow
3/ min; Auxiliary little oxygen rifle flow≤15m
3/ min.
4, electric furnace to converter steel making production process as claimed in claim 1 is characterized in that: described slagging regime, when in electric furnace, feeding in raw material, expect that at every turn the bottom of basket need add packed lime in advance.
5, electric furnace to converter steel making production process as claimed in claim 1 or 2 is characterized in that: described steel scrap is pulverized material and is meant that the gauge is＜Φ 150mm bulk density＞4t/m
3,, avoid binder in the electric furnace to improve bulk density.
6, described electric furnace to converter steel making production process as claimed in claim 1, it is characterized in that: power-on time was at 3-8 minute.
7, as claim 1 or 4 described electric furnace to converter steel making production process, it is characterized in that: slag is rare excessively in converting process, and basicity＜2.0 o'clock add the residue adjustment of 100～150kg magnesium ball at every turn.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100415025A CN1255558C (en) | 2004-07-27 | 2004-07-27 | Production technology for melting steel by electric arc furnace converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100415025A CN1255558C (en) | 2004-07-27 | 2004-07-27 | Production technology for melting steel by electric arc furnace converter |
Publications (2)
| Publication Number | Publication Date |
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| CN1598000A CN1598000A (en) | 2005-03-23 |
| CN1255558C true CN1255558C (en) | 2006-05-10 |
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| CNB2004100415025A Expired - Fee Related CN1255558C (en) | 2004-07-27 | 2004-07-27 | Production technology for melting steel by electric arc furnace converter |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100363508C (en) * | 2005-11-24 | 2008-01-23 | 广东韶钢松山股份有限公司 | Electric furnace to converter steel making production process |
| CN102534112B (en) * | 2012-02-01 | 2014-07-16 | 江苏省沙钢钢铁研究院有限公司 | Total-converting steelmaking method of electric furnace |
| CN102559994B (en) * | 2012-03-20 | 2013-11-27 | 江苏省沙钢钢铁研究院有限公司 | Method for drying electric furnace by using molten iron |
| CN103014231B (en) * | 2012-12-28 | 2015-03-11 | 攀枝花钢城集团瑞钢工业有限公司 | Oxygen supplying method for smelting slag steel and slag iron by electric arc furnace |
| CN103667588B (en) * | 2013-09-05 | 2015-08-26 | 通裕重工股份有限公司 | Electricity converter steelmaking process |
| CN105132620A (en) * | 2015-09-10 | 2015-12-09 | 山东西王特钢有限公司 | Cost-reducing steelmaking method |
| CN108570531A (en) * | 2018-04-28 | 2018-09-25 | 江苏省沙钢钢铁研究院有限公司 | A kind of smelting process reducing electric furnace steel making steel technology |
| CN110241287A (en) * | 2019-06-18 | 2019-09-17 | 浦项(张家港)不锈钢股份有限公司 | A kind of method of the ultra high electric arc furnace without electric smelting |
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2004
- 2004-07-27 CN CNB2004100415025A patent/CN1255558C/en not_active Expired - Fee Related
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Owner name: NANJING NANGANG INDUSTRY DEVELOPMENT CO., LTD. Free format text: FORMER OWNER: NANJING UNITE STEEL CO., LTD. Effective date: 20091120 |
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Effective date of registration: 20091120 Address after: Liuhe District of Nanjing City, Jiangsu Province, xiejiadian Patentee after: Nanjing Iron & Steel United Co., Ltd. Address before: Liuhe District of Nanjing City, Jiangsu Province, xiejiadian Patentee before: Nanjing Iron & Steel United Co., Ltd. |
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Granted publication date: 20060510 Termination date: 20120727 |