CN103031405A - Steel making technology for hot addition and transit of liquid steel slag in electric furnace - Google Patents

Steel making technology for hot addition and transit of liquid steel slag in electric furnace Download PDF

Info

Publication number
CN103031405A
CN103031405A CN2011103858966A CN201110385896A CN103031405A CN 103031405 A CN103031405 A CN 103031405A CN 2011103858966 A CN2011103858966 A CN 2011103858966A CN 201110385896 A CN201110385896 A CN 201110385896A CN 103031405 A CN103031405 A CN 103031405A
Authority
CN
China
Prior art keywords
slag
steel
electric furnace
furnace
liquid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN2011103858966A
Other languages
Chinese (zh)
Other versions
CN103031405B (en
Inventor
解英明
陈跃军
俞海明
李栋
段建勇
兰飞鹏
钟文斌
李立明
王瑞利
胡永胜
姜新平
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xinjiang Bayi Iron and Steel Co Ltd
Original Assignee
Xinjiang Bayi Iron and Steel Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Xinjiang Bayi Iron and Steel Co Ltd filed Critical Xinjiang Bayi Iron and Steel Co Ltd
Priority to CN201110385896.6A priority Critical patent/CN103031405B/en
Publication of CN103031405A publication Critical patent/CN103031405A/en
Application granted granted Critical
Publication of CN103031405B publication Critical patent/CN103031405B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • 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
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies

Abstract

The invention relates to a steel making technology for hot addition and transit of liquid steel slag in an electric furnace. Taking the operation of a 120 ton-converter and a 70-ton direct current electric furnace for example, the steel making technology comprises the steps of: firstly adding 5-15t of liquid steel slag of the converter after steel tapping of the electric furnace, and then adding 40-60t of a first bath of steel scrap, or adding the liquid steel slag after electric furnace penetration, wherein the addition time is 0.8-5.0min; carrying out normal steel making operation; discharging one fourth to one third of steel slag when the first batch of material is added to the steel furnace for 4-6min or is nearly melted down, and then carrying out normal operation; adding 300-1500kg of lime to a second batch of material, wherein the tapping temperature of the electric furnace is 1600-1700 DEG C, and a 6-30m<3> slag pot is used for containing the liquid steel slag; reserving a 30-50cm distance above a liquid slag surface to prevent the slag to be lifted, pulled and transported from overflowing; controlling the addition and transit time of the liquid slag in 3-5min and the temperature to be above 1350 DEG C; and obtaining a reasonable specific value between the addition amount of the steel slag and the power consumption of electric furnace smelling according to a computational formula. The steel making technology is suitable for the smelting of the direct-current electric furnace, an alternating-current electric furnace, an intermediate frequency furnace, an induction furnace and an electro-slag furnace.

Description

Electric furnace heat is converted the process for making of converter liquid steel slag
Technical field
The present invention relates to converter slag and process and Electric Furnace Steelmaking, especially give prominence to the scientific utilization at bessemer furnace slag, can effectively reduce the lime consumption of Electric furnace steel making, be the consumption reduction type technique of enterprise.
Background technology
The basicity of the basicity of bessemer furnace slag and the slag of electrosmelting is different, and wherein the dual alkalinity of bessemer furnace slag is between 2.8～4.2, and magnesian content maintains between 8%～14% in the slag; Keep higher basicity and be in order to keep slag that the stronger oxygen that transmits to the molten bath is arranged, carry out the dephosphorization decarburization at slag interface, and the demand that satisfies slag splashing; Contain a large amount of physical thermals in the middle of the traditional converter liquid steel slag, treatment process is that hot application, heat are vexed, tray, roller slag, the wind method such as quench, and heat energy recycle efficient wherein is lower; In the EAF Steelmaking Process, for needing the ton steel, dephosphorization adds the lime of 45-60kg, the scope of dual alkalinity the best of electric furnace slag is between 2.0～2.5, content of magnesia in the slag is between 4%～8%, it satisfies beyond the demand of electric furnace dephosphorization decarburization, main technique is to impel slag to have best foaming height, and wherein magnesium oxide plays the effect of adjusting slag fluidity and increasing the middle foaming of slag particle; The main energy 70% of electric furnace derives from electric energy and is converted to heat energy, and energy-conservation main method is to increase chemical heat, the usage quantity of namely jet organic-fuel and increase oxygen.
Searching document is learned: 1. " Clean Steel Production In Eaf " Shanghai Metals 2001(4 of Gao Shaoping): 1.2. Qiu Shao qi, Zhu Guihua, " Electric furnace steel making principle and technique " metallurgical industry press 2001.7.3. sharp along adding " wide steel electric furnace hot metal charge process practice " southern iron and steel 2000(12): 27.4. Zhang Jianliang, Liu Yuquan, Zhang Zongwang " a kind of New High Quality Charge Used for EAF steel research " steel research 2001(4): 69.5. Peng Bing, Zhang Chuanfu etc. " Electric Arc Furnace In Abroad steel-making latest developments " steel research 2000(3): 47.6. Song Jia roc, Jiang Guilian " the 150t ultra-high power electric arc furnace is produced the Technology of high-quality steel " steel-making 2000 (5): 17.In smelting, the heat energy of converter liquid steel slag and slag high alkalinity characteristic be converted into the energy and resource and the technology that is used has no disclosure.
Technique success of the present invention the converter liquid steel slag is applied to Electric furnace steel making, both saved a part of lime raw material that Electric furnace steel making needs, also saved the melting electric consumption of part, can also improve production capacity, saved the cost that converter slag is processed, the technical support of high-quality is provided for the energy-saving and emission-reduction of enterprise.
Summary of the invention
The object of the invention is to: with the economize on electricity of the heat energy in the middle of the liquid bessemer furnace slag for EAF Steelmaking Process, the slag of high alkalinity is used for substituting most of lime that EAF Steelmaking Process is used, and reaches the purpose of saving the lime usage quantity.
The object of the present invention is achieved like this: electric furnace heat is converted the process for making of converter liquid steel slag, the example that is operating as with 120 tons of converters and 70 tons of direct current furnaces, behind electric furnace steel tapping, at first convert the liquid steel slag 5-15t that adds converter, then convert and add first steel scrap 40-60 ton, or after electric furnace is worn well, liquid steel slag is blended into, converts that to add the time be 0.8-5.0min, then make steel normally operation; Electric furnace enters stove 4-6min at the first batch of material, or approaches when molten clear, banishes 1/4th to 1/3rd slag, then changes routine work over to; With addition of the lime of 300-1500kg, the tapping temperature of electric furnace is 1600-1700 ℃ in the second batch of material;
Wherein the splendid attire liquid steel slag uses the slag ladle of 6-30m3, keeps the distance of 30-50cm on its melt cinder face, prevents that the slag that lifts roping from overflowing;
Wherein converting of melt cinder adds the transhipment time and is controlled in the 35min, and temperature is more than 1350 ℃;
Wherein with calculation formula, obtain the reasonable ratio of the slag amount of being blended into and electrosmelting electrisity consumption.
Described process for making, the calculation formula between the slag amount of being blended into and the electrosmelting power consumption:
Current consumption in the formula is not more than 1MWh with the error of reality, i.e. 1Mwh=10 3Kwh.
Action principle of the present invention: the liquid steel slag of converter converted be added in the electric furnace, carry out the smelting of steel scrap, namely utilize the basicity of liquid steel slag, 2.8～4.2, Σ CaO/ Σ SiO2 and thermal capacitance be 0.8KJ/kg ℃, utilized again calcium oxide rich in good electroconductibility and heat energy and the slag etc., particularly electric furnace heat is converted after the liquid steel slag of converter, slag charge lime only need to add 1/4th to 1/3rd of original technique (not converting the technique that adds the converter liquid steel slag), just can satisfy the smelting demand; Because reduced lime adding amount, reduced accordingly the consumption of lime, also reduced the needed heat energy of fusing lime, the physical thermal that liquid bessemer furnace slag of while is brought into has also been saved the part electric energy, thereby realizes energy-saving and cost-reducing purpose; The liquid steel slag of converter, (subzero 30 degrees centigrade～40 degrees centigrade above freezing) wait for 40～90min under normal weather condition, and it is liquid that 2/3rds slag still can keep, and just viscosity slightly increases, still can satisfy the needs that heat is converted, show technical progress.
 
Embodiment
Embodiment
The key points for operation of converter: 120t bessemerizes the end deslagging, and its slag is poured in the special-purpose slag ladle (take cast steel as material), is transported to electric furnace; Treat the 70t electric furnace steel tapping, the liquid steel slag of converter is converted be added in the electric furnace, and then add raw scrap material, implement to smelt operation.
Production Flow Chart:
1) tests as example take converter and direct current furnace;
2) gone out steel at electric furnace, at first added liquid steel slag 10t, then added steel scrap 50t, in particular cases also can wear after the well by electric furnace, liquid steel slag is blended in the electric furnace well, converts to add time 3.0min; The roping of converter liquid steel slag was controlled in the 25min to the transhipment time of electric furnace, waited for that converting the time that adds is controlled in the 35min, and temperature is controlled at more than 1350 ℃;
3) liquid steel slag is converted the time that adds electric furnace and is controlled in the 35min, overtime, and easily crust in the surface, and crust is seriously return the slag field and is processed; Wherein the splendid attire liquid steel slag uses the slag ladle of 20m3, keeps the distance of 40cm on its melt cinder face, prevents that the slag that lifts roping from overflowing.
4) with addition of lime 500-1500kg, purpose is that electric-furnace slag basicity was about 2.0 after the assurance electric furnace melted clearly to 70 tons electric furnace in the second batch of material, and the basicity of converter liquid slag is higher, when add-on is more.
5) electric furnace is converted and is added after the hot bessemer furnace slag, after the first batch of material enters stove 5min, perhaps approaches when molten clear, banishes 1/4th to 1/3rd slag, then changes conventional smelting operation over to; Banish the purpose of slag, both reduced the basicity of slag, reduced again the acidic substance SiO in the slag 2, P 2O 5Content.
6) the bessemer furnace slag amount of being blended into is larger, and power consumption is lower; To tap 1630 ℃ as standard, the current consumption between the slag amount of being blended into and the eaf tapping point melting electric consumption is not more than 1 MWh, i.e. 1Mwh=10 with the error of reality 3Kwh.
For example: 80 tons of electric furnace Intake Quantitys, heat are converted 8 tons in slag, and the electric word formula of smelting tapping is: 80 * 400-500 * 8)/and 1000=28MWh; Be that electric word arrives 28 MWh, be the power consumption electricity word of Theoretical Calculation, be not more than 1 MWh with the error of reality.
The economic benefit that the present invention produces:
1) compares with the full scrap smelting of identical Intake Quantity, add liquid steel slag 1%(industry situation slag and account for all furnace charges, the mass percent that comprises the steel scrap pig iron), the ton steel is saved power consumption 5KWh, such as one 150 tons electric furnace, add 15 tons of liquid bessemer furnace slags, electric power consumption per ton steel is saved 50 KWh, and according to 0.4 yuan of calculating of electricity price, the ton steel reduces by 20 yuan of electric costs, calculate 3000 yuan of every stove energy-saving efficiencies according to 150 tons of steel.
2) save 0.5～5.5 ton in lime, in the smelting process oxygen blast simple to operate, Composition Control is easy, every stove is saved 200～2000 yuan of lime costs of use.
3) smelting cycle of electric furnace shortens 3～8min, and 3～10 tons of the unit-hour outputs of increase electric furnace according to 50 yuan of calculating of ton steel benefit, increase benefit 150-500 unit; For company reduces lime output, the quantity discharged of reduction slag etc. are benefit indirectly.
Process for making of the present invention is applicable to the general steel of direct current furnace, ac electric arc furnace and the smelting of special steel, or the smelting of the smelting of mother liquor of stainless steel, intermediate frequency furnace cast steel, the smelting of induction furnace, the smelting of electroslag furnace.

Claims (3)

1. electric furnace heat is converted the process for making of converter liquid steel slag, it is characterized in that: with the example that is operating as of 120 tons of converters and 70 tons of direct current furnaces, behind electric furnace steel tapping, at first convert the liquid steel slag 5-15t that adds converter, then convert and add 40～60 tons of first steel scraps, or after electric furnace is worn well, liquid steel slag is blended into, converts that to add the time be 0.8-5.0min, then make steel normally operation; Electric furnace enters stove 4-6min at the first batch of material, or approaches when molten clear, banishes 1/4th to 1/3rd slag, then changes routine work over to; With addition of the lime of 300-1500kg, the tapping temperature of electric furnace is 1600-1700 ℃ in the second batch of material;
Wherein the splendid attire liquid steel slag uses the slag ladle of 6-30m3, keeps the distance of 30-50cm on its melt cinder face, prevents that the slag that lifts roping from overflowing;
Wherein converting of melt cinder adds the transhipment time and is controlled in the 35min, and temperature is more than 1350 ℃;
Wherein with calculation formula, obtain the reasonable ratio of the slag amount of being blended into and electrosmelting electrisity consumption.
2. process for making according to claim 1 is characterized in that: the calculation formula between the slag amount of being blended into and the electrosmelting power consumption:
Current consumption in the formula is not more than 1MWh with the error of reality, i.e. 1Mwh=10 3 Kwh.
3. process for making according to claim 1, it is characterized in that: this technique is applicable to the general steel of direct current furnace, ac electric arc furnace and the smelting of special steel, or the smelting of the smelting of mother liquor of stainless steel, intermediate frequency furnace cast steel, the smelting of induction furnace, the smelting of electroslag furnace.
CN201110385896.6A 2011-11-29 2011-11-29 Steel making technology for hot addition and transit of liquid steel slag in electric furnace Active CN103031405B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201110385896.6A CN103031405B (en) 2011-11-29 2011-11-29 Steel making technology for hot addition and transit of liquid steel slag in electric furnace

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201110385896.6A CN103031405B (en) 2011-11-29 2011-11-29 Steel making technology for hot addition and transit of liquid steel slag in electric furnace

Publications (2)

Publication Number Publication Date
CN103031405A true CN103031405A (en) 2013-04-10
CN103031405B CN103031405B (en) 2015-03-18

Family

ID=48018804

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201110385896.6A Active CN103031405B (en) 2011-11-29 2011-11-29 Steel making technology for hot addition and transit of liquid steel slag in electric furnace

Country Status (1)

Country Link
CN (1) CN103031405B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103499215A (en) * 2013-10-15 2014-01-08 攀钢集团攀枝花钢铁研究院有限公司 Device and method for hot charging short molten slag

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62287009A (en) * 1986-06-04 1987-12-12 Sumitomo Metal Ind Ltd Method for preventing rephosphorization in production of extra-low phosphorus steel
JPH083613A (en) * 1994-06-20 1996-01-09 Sumitomo Metal Ind Ltd Iron-making and steelmaking method
JP2653301B2 (en) * 1991-12-05 1997-09-17 住友金属工業株式会社 Reusing method of low P converter slag
CN1250813A (en) * 1998-12-08 2000-04-19 承德钢铁集团有限公司 Method for reforming slags system of smelting steel with low-Si molten iron or semisteel by using slag inclusion of converter as slag modifier
CN1357055A (en) * 1999-06-23 2002-07-03 Sms德马格股份公司 Method for receiving metallic chromium from slag contg. chromium oxide
CN1597997A (en) * 2004-08-17 2005-03-23 西安建筑科技大学 Grading using method for slag of steel-melting furnace
CN101403021A (en) * 2008-11-08 2009-04-08 山西太钢不锈钢股份有限公司 Utilization method for steel scoria
EP2213753A1 (en) * 2009-02-02 2010-08-04 AKADEMIA GORNICZO-HUTNICZA im. Stanislawa Staszica Method of production of a slag-forming compound for secondary steel refining in a ladle or ladle furnace
CN102181588A (en) * 2011-03-22 2011-09-14 重庆中渣冶金再生资源有限公司 Method for recycling refined casting residues during steelmaking in steel plant

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62287009A (en) * 1986-06-04 1987-12-12 Sumitomo Metal Ind Ltd Method for preventing rephosphorization in production of extra-low phosphorus steel
JP2653301B2 (en) * 1991-12-05 1997-09-17 住友金属工業株式会社 Reusing method of low P converter slag
JPH083613A (en) * 1994-06-20 1996-01-09 Sumitomo Metal Ind Ltd Iron-making and steelmaking method
CN1250813A (en) * 1998-12-08 2000-04-19 承德钢铁集团有限公司 Method for reforming slags system of smelting steel with low-Si molten iron or semisteel by using slag inclusion of converter as slag modifier
CN1357055A (en) * 1999-06-23 2002-07-03 Sms德马格股份公司 Method for receiving metallic chromium from slag contg. chromium oxide
CN1597997A (en) * 2004-08-17 2005-03-23 西安建筑科技大学 Grading using method for slag of steel-melting furnace
CN101403021A (en) * 2008-11-08 2009-04-08 山西太钢不锈钢股份有限公司 Utilization method for steel scoria
EP2213753A1 (en) * 2009-02-02 2010-08-04 AKADEMIA GORNICZO-HUTNICZA im. Stanislawa Staszica Method of production of a slag-forming compound for secondary steel refining in a ladle or ladle furnace
CN102181588A (en) * 2011-03-22 2011-09-14 重庆中渣冶金再生资源有限公司 Method for recycling refined casting residues during steelmaking in steel plant

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
刘树振: "《钢渣在炼钢领域中的应用》", 《炼钢》, no. 6, 31 December 1994 (1994-12-31), pages 54 - 59 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103499215A (en) * 2013-10-15 2014-01-08 攀钢集团攀枝花钢铁研究院有限公司 Device and method for hot charging short molten slag
CN103499215B (en) * 2013-10-15 2015-08-26 攀钢集团攀枝花钢铁研究院有限公司 A kind of hot charging device of melting short slag and method

Also Published As

Publication number Publication date
CN103031405B (en) 2015-03-18

Similar Documents

Publication Publication Date Title
CN105525055B (en) A kind of control method of converter less-slag melting carbon period splash
CN103469049B (en) Molybdenum oxide DIRECT ALLOYING process for making
CN102787196B (en) Method for smelting stainless steel by direct reduced iron
CN103266196B (en) Method for producing carbon steel by using low-temperature low-silicon molten iron in 90-ton converter
CN105671248B (en) A kind of smelting process of converter high efficiency dephosphorating
CN102787195B (en) Stainless-steel smelting method
CN103205524A (en) Method for smelting low-sulfur steel from semi-steel
CN104178594B (en) A kind of method of converter simply connected vanadium extraction steel-making
CN103352101A (en) Low-cost smelting technology of converter
CN103014230B (en) Method for producing low-phosphorus high-carbon steel by duplex hot-adding slag washing for electric furnace
CN104762488B (en) A kind of method of direct vanadium alloying in esr process
CN103205529A (en) Zero-power consumption steel-making method using electric-arc furnace
CN102839251B (en) Smelting method of low-phosphorous steel
CN102277470B (en) Method for smelting low-silicon cold heading steel
CN103643056B (en) The smelting process of low carbon ferromanganese
CN105132611A (en) Method for producing ultra-low phosphorous steel through single slag of converter
CN107287382A (en) A kind of method of remained converter slag slag removing and furnace protecting
CN103643094B (en) The smelting process of high carbon ferromanganese
CN103627846A (en) Method for performing direct alloying to molybdenum oxide for steelmaking
CN103205522B (en) Method for smelting plain carbon steel from semi-steel
CN101993972B (en) Arc furnace steelmaking method
CN107034334A (en) The double slag melting methods of half steel of the quick slagging of falling stove
CN103966387B (en) Adopt the method for semi-steel making
CN103031405B (en) Steel making technology for hot addition and transit of liquid steel slag in electric furnace
CN105177217A (en) Process for reducing steel slag quantity during converter smelting

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant