CN100363508C - Electric furnace to converter steel making production process - Google Patents
Electric furnace to converter steel making production process Download PDFInfo
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- CN100363508C CN100363508C CNB2005101014290A CN200510101429A CN100363508C CN 100363508 C CN100363508 C CN 100363508C CN B2005101014290 A CNB2005101014290 A CN B2005101014290A CN 200510101429 A CN200510101429 A CN 200510101429A CN 100363508 C CN100363508 C CN 100363508C
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The present invention relates to a pneumatic steelmaking production process of an electric furnace, which comprises the furnace material components of (by weight percentage) 80% to 90% of iron melt and 10 to 20% of scrap steel, foundry iron and other cold materials, and the iron melt is continuously blended in the electric furnace at the speed of 1.0 to 3.5 tons per minute according to the state of the furnace; the scrap steel passes through one conveyer belt with preheating function, and is added in the electric furnace at the addition speed of 1.0 to 3.5 tons per minute, and lime is added in the electric furnace for slagging; a coherent jet oxygen lance arranged on a furnace wall ejects oxygen flow towards the molten steel in the electric furnace, the temperature of the molten steel in the electric furnace is controlled to be within the range of 1550 DEG C to 1580 DEG C, and a Fe-Si alloy deoxidizer or a Fe-Mn alloy deoxidizer is added in a ladle in a tapping process. The present invention provides an electric furnace smelting process for adopting the iron melt to replace the scrap steel without using electric energy, and the process has the advantages of great economy, reduced outer overflow of flue gas and improved operating environment; the production cost is equivalent to the production cost of converter steel.
Description
[technical field]
The present invention relates to the complete converter steel making production process of a kind of continuous steelmaking electric arc furnace, especially relate to a kind ofly under the situation of not using electric energy, adopt a large amount of molten iron to add the electric furnace to converter steel making production process of a small amount of steel scrap in the furnace charge component structure.
[background technology]
Explanation of nouns: CONSTEEL: continuous steelmaking.
The production technique of electric-arc furnace steelmaking commonly used is based on cold charge steel scrap technology, furnace charge component structure is with steel scrap, be aided with metal charges such as the pig iron, scrap iron, and auxiliary oxygen blast, add slag former, can tap when reaching certain tapping condition, carry out external refining then, the shortcoming of this method is to need to consume a large amount of electric energy melting batch.
In addition, current a kind of new arc furnace steeling process also appearred, be exactly in electric furnace, to add a certain amount of molten iron, wherein the weight percent content of molten iron is generally below 50%, the adding of molten iron is to adopt hot metal ladle directly to be blended in the electric furnace, the melting thermal source is still based on electrode power supply, auxiliary oxygen blast, and other method with traditional arc smelting steel is identical.The shortcoming of this production technique is: steel scrap, pig iron usage quantity are main heat energy greater than 50% with electric energy, and need to consume a large amount of electrodes, and the production cost height has bigger gap with the production cost of converter steelmaking.
[summary of the invention]
In order to overcome the above-mentioned shortcoming of prior art, the present invention is directed to the present different present situations that make the electric steel cost apparently higher than the converter steel cost owing to furnace charge component structure and energy-provision way, a kind of electric energy that do not use that provides, with the electric furnace to converter steel making production process of the furnace charge component structural similitude of converter, thereby make electric steel production cost and converter steel basic identical.
The technical solution adopted for the present invention to solve the technical problems is: a kind of electric furnace to converter steel making production process, the weight percent content of each component is in the furnace charge: molten iron is 80%-90%, steel scrap, the ratio of the pig iron and other cold burden is 10-20%, and in electric furnace, be blended into molten iron continuously with the speed of 1.0-3.5 ton/min according to the stove shape, steel scrap is by a conveying belt with preheat function, adding speed with 2.5-0.5 ton/min joins the electric furnace from the furnace wall, simultaneously, in electric furnace, add lime, carry out slag making, by the molten steel injection of oxygen stream of cluster fluidic oxygen gun in electric furnace that is installed in the furnace wall, liquid steel temperature is controlled in 1550 ℃-1580 ℃ the scope in the electric furnace, in tapping process, in ladle, add Fe-Si or Fe-Mn alloy reductor.
In the described oxygen supply process, single cluster fluidic oxygen gun provides 3180Nm
3/ h and 3480Nm
3The Oxygen Flow of two grades of/h.
In the described oxygen supply process, the best is by the molten steel injection of oxygen stream of three cluster fluidic oxygen guns in electric furnace.
In the described slagging process, when smelting beginning, the lime that adds 600-1000kg in the electric furnace, slag making is in advance smelted whole process and is the stream slag operation, so the adding of slag charge should add with many batches of a small amount of principles according to the quantity of slag in the stove, the alkali of slag is useless should to be controlled at 2.5-3.0, should in slag, spray into carbon dust by the furnace wall cluster fluidic oxygen gun according to the foamy slag situation simultaneously, with the thickness of guaranteeing foamy slag between 250mm-400mm.
Described tapping technology is that weight reaches 135 ton hours and should stop to feed in raw material in the stove, strengthen oxygen blast intensity, carbon is dropped to below 0.10%, temperature is controlled at 1650 ℃, adding 1800kgFe-Mn and 600kgFe-Si carry out deoxidation in tapping process, and add 800kg lime and the slag making of 150kg fluorite.
At the molten steel that should in stove, leave the 30-50 ton after the tapping, so that next furnace operating can guarantee that also oxidation sludge does not flow in the ladle simultaneously.
Positively effect of the present invention is: provide a kind of a large amount of molten iron to substitute steel scrap, do not use the electric furnace smelting process of electric energy, this technology has very big economy, production cost and converter steel production cost are suitable substantially, reduce 500-800 unit/ton, remarkable in economical benefits with the production cost of traditional cold furnace burdening electric furnace; Owing to do not use electric energy, still can guarantee ordinary production at power shortage or outage supply situation; Because a large amount of very low molten iron of assorted degree that uses greatly reduces the molten steel residual element, require lower steel grade to create good condition simultaneously to steel quality and residual element; The use electrode is few, thus in ordinary production, cancelled the electrode hole syphon, and adopt the cooled plate of sealing, and make flue gas emit a large amount of minimizings outward, dust removing effects is better, has improved operating environment greatly.
[embodiment]
Electric furnace is 90 tons of CONSTEEL electric arc furnace, and tap is 90 tons, and the furnace charge of adding is 100 tons, and wherein iron water amount is 85 tons, and steel scrap and other cold burden are 15 tons, and steel scrap is small-sized steel scrap.
Steel scrap adds: the total amount that steel scrap adds is 15 tons, smelt beginning and just in stove, add steel scrap with the speed of 2 tons/min, make the steel temperature of staying in the stove reduce to 1550-1580 ℃ rapidly, reduce feed rate then, be controlled at about 0.5 ton/min, add at molten iron and to add steel scrap in preceding about 5 minutes, as liquid steel temperature is too high before tapping, can add a small amount of steel scrap and adjust temperature.
Molten iron adds: begin to add molten iron by Molten iron chute in stove after steel scrap adds about 2 minutes, the adding speed of beginning is advisable with 1.5 tons/min, progressively strengthen then, treat in the stove that the speed with 3.0 tons/min adds behind the reacting balance, should add speed by good molten iron according to the smelting mode control in the stove, molten iron up to about 85 tons all adds, and the time of adding should be controlled at 35-40 minute.
Oxygen supply: oxygen supply of the present invention is after molten iron has added about 1 minute, starts oxygen rifle oxygen supply in stove in fire door left side, and oxygen supply intensity is 3180Nm
3/ h progressively starts two oxygen rifles oxygen supply in addition then, and oxygen supply intensity is specifically regulated according to charge weight in the stove, should use high strength to come oxygen decarburization after molten iron adds, to reach the tapping condition as early as possible.
Temperature controlling in the stove: the control of liquid steel temperature is the core of whole smelting control in the stove, because the characteristics of CONSTEEL electric furnace are to smelt whole process all to carry out under liquid state, so should be controlled at liquid steel temperature 1550 ℃-1580 ℃ scope, to guarantee decarburization, dephosphorization effect, simultaneously also can effectively control the big boiling of molten steel, often thermometric guarantees that temperature is accurate in the stove simultaneously, before tapping temperature is carried to about 1650 ℃.The adding speed of molten iron and the adding speed of steel scrap, oxygen blown intensity all should be regulated and control around temperature.
Slagging process: when smelting beginning, the lime that adds 800kg in the stove, slag making in advance, smelt whole process and be the stream slag operation, so the adding of slag charge should add with many batches of a small amount of principles according to the quantity of slag in the stove, the basicity of slag should be controlled at 2.5-3.0, should can in slag, spray into carbon dust by wall lance according to the foamy slag situation simultaneously, between 250-400mm, in the present embodiment, whole process all should make foamy slag thickness remain on about 300mm with the thickness of guaranteeing foamy slag.The quantity of slag should in time be replenished slag charge more after a little while in stove, and bits are crossed and can be added a small amount of rhombspar when rare and regulate.Foamy slag is crossed when hanging down can spray carbon in stove, note having cleared up fire door, guarantees that the stream slag is unobstructed.
Tapping technology: weight reaches 135 tons of left and right sides Shi Ying and stops to feed in raw material in stove, strengthens oxygen blast intensity, and carbon is dropped to below 0.10%, temperature is controlled at 1650 ℃, and temperature is too high replenishes an amount of steel scrap cooling, and temperature is crossed and lowly can be replenished an amount of molten iron temperature raising, when reaching the tapping condition, just can tap.Adding 1800kgFe-Mn and 600kgFe-Si carry out deoxidation in tapping process, and add about 800kg lime and the slag making of 150kg fluorite.Tap is about 90 tons.
Next furnace operating should in stove, leave the molten steel of 40-45 ton after the tapping, so that can guarantee that also oxidation sludge does not flow in the ladle simultaneously.
When actually operating, the above-mentioned technology of the uncomfortable employing of first stove of new stove first stove and big fettling should adopt the cold charge furnace charge, and the traditional operation technology of electrode power supply melting waste steel is good to guarantee electric furnace refractory materials sintering.
Claims (3)
1. electric furnace to converter steel making production process, the weight percent content of each component is in the furnace charge: molten iron is 80%-90%, steel scrap, the ratio of the pig iron and other cold burden is 10-20%, in electric furnace, be blended into molten iron according to the stove shape continuously with the speed of 1.0-3.5 ton/min, steel scrap is by a conveying belt with preheat function, adding speed with 2.5-0.5 ton/min adds the electric furnace from the furnace wall, and in electric furnace, add lime, carry out slag making, by the molten steel injection of oxygen stream of cluster fluidic oxygen gun in electric furnace that is installed in the furnace wall, liquid steel temperature is controlled in 1550 ℃-1580 ℃ the scope in the electric furnace, in the tapping process, in ladle, add Fe-Si or Fe-Mn alloy reductor, it is characterized in that: in described slagging process, when smelting beginning, the lime that adds 600-1000kg in the electric furnace, slag making in advance, smelt whole process and be the stream slag operation, so the adding of slag charge should add with many batches of a small amount of principles according to the quantity of slag in the stove, the basicity of slag should be controlled at 2.5-3.0, should in slag, spray into carbon dust by the furnace wall cluster fluidic oxygen gun according to the foamy slag situation simultaneously, with the thickness of guaranteeing foamy slag between 250mm-400mm.
2. a kind of electric furnace to converter steel making production process according to claim 1 is characterized in that: in the described oxygen supply process, single cluster fluidic oxygen gun provides 3180Nm
3/ h and 3480Nm
3The Oxygen Flow of two grades of/h.
3. a kind of electric furnace to converter steel making production process according to claim 1, it is characterized in that: described tapping technology is that weight reaches 135 ton hours and should stop to feed in raw material in the stove, strengthen oxygen blast intensity, carbon is dropped to below 0.10%, temperature is controlled at 1650 ℃, adding 1800kgFe-Mn and 600kgFe-Si carry out deoxidation in tapping process, and add 800kg lime and the slag making of 150kg fluorite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101014290A CN100363508C (en) | 2005-11-24 | 2005-11-24 | Electric furnace to converter steel making production process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101014290A CN100363508C (en) | 2005-11-24 | 2005-11-24 | Electric furnace to converter steel making production process |
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| Publication Number | Publication Date |
|---|---|
| CN1775959A CN1775959A (en) | 2006-05-24 |
| CN100363508C true CN100363508C (en) | 2008-01-23 |
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|---|---|---|---|
| CNB2005101014290A Expired - Fee Related CN100363508C (en) | 2005-11-24 | 2005-11-24 | Electric furnace to converter steel making production process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3548640B1 (en) | 2016-12-02 | 2022-09-21 | Tenova S.p.A. | Convertible metallurgical furnace and modular metallurgical plant comprising said furnace for conducting production processes for the production of metals in the molten state, in particualr steel or cast iron |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102041349A (en) * | 2010-12-22 | 2011-05-04 | 本钢板材股份有限公司 | Method for smelting steel by adopting induction furnace |
| CN102534112B (en) * | 2012-02-01 | 2014-07-16 | 江苏省沙钢钢铁研究院有限公司 | Electric furnace full-blowing steelmaking method |
| CN102634637B (en) * | 2012-05-16 | 2013-08-14 | 中天钢铁集团有限公司 | Operation technology for electric furnace converter |
| CN103205529B (en) * | 2013-03-29 | 2014-12-10 | 江苏省沙钢钢铁研究院有限公司 | Zero-power-consumption steelmaking method for electric arc furnace |
| CN103468862B (en) * | 2013-09-26 | 2015-05-27 | 西宁特殊钢股份有限公司 | Efficient full-iron steelmaking method allowing molten iron to be added into pig iron in electric-arc furnace |
| CN108103261A (en) * | 2017-12-29 | 2018-06-01 | 唐山市德龙钢铁有限公司 | A kind of mini-mill steelmaking method based on converter |
| CN108103262A (en) * | 2017-12-29 | 2018-06-01 | 唐山市德龙钢铁有限公司 | A kind of converter steel making method for improving ton steel scrap ratio |
| 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 |
| CN110714109A (en) * | 2019-10-17 | 2020-01-21 | 柳州钢铁股份有限公司 | Method for controlling smoke emission of converter scrap steel |
| CN112410505B (en) * | 2020-09-30 | 2022-06-14 | 盐城市联鑫钢铁有限公司 | Efficient low-cost smelting process for electric furnace |
| CN118064672B (en) * | 2024-04-19 | 2024-07-16 | 江苏利淮钢铁有限公司 | Technological method for adding molten iron into vector electric furnace molten pool |
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| KR20020041079A (en) * | 2000-11-27 | 2002-06-01 | 이구택 | A method for operating electric arc furnace using hot melt |
| US6424671B1 (en) * | 1999-02-11 | 2002-07-23 | National Research Development Corporation | Process for making steel |
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| CN1598000A (en) * | 2004-07-27 | 2005-03-23 | 南京钢铁联合有限公司 | Production technology for melting steel by electric arc furnace converter |
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2005
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Patent Citations (4)
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|---|---|---|---|---|
| US6424671B1 (en) * | 1999-02-11 | 2002-07-23 | National Research Development Corporation | Process for making steel |
| KR20020041079A (en) * | 2000-11-27 | 2002-06-01 | 이구택 | A method for operating electric arc furnace using hot melt |
| KR20030047539A (en) * | 2001-12-11 | 2003-06-18 | 주식회사 포스코 | Method for manufacturing the melting steel with increasing the decarburizing velocity in the electrical arc furnace |
| CN1598000A (en) * | 2004-07-27 | 2005-03-23 | 南京钢铁联合有限公司 | Production technology for melting steel by electric arc furnace converter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3548640B1 (en) | 2016-12-02 | 2022-09-21 | Tenova S.p.A. | Convertible metallurgical furnace and modular metallurgical plant comprising said furnace for conducting production processes for the production of metals in the molten state, in particualr steel or cast iron |
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| CN1775959A (en) | 2006-05-24 |
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Granted publication date: 20080123 Termination date: 20181124 |