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WO2012002338A1 - 粒状金属鉄を用いた溶鋼製造方法 - Google Patents

粒状金属鉄を用いた溶鋼製造方法 Download PDF

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Publication number
WO2012002338A1
WO2012002338A1 PCT/JP2011/064717 JP2011064717W WO2012002338A1 WO 2012002338 A1 WO2012002338 A1 WO 2012002338A1 JP 2011064717 W JP2011064717 W JP 2011064717W WO 2012002338 A1 WO2012002338 A1 WO 2012002338A1
Authority
WO
WIPO (PCT)
Prior art keywords
iron
molten
metallic iron
granular metallic
granular
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.)
Ceased
Application number
PCT/JP2011/064717
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English (en)
French (fr)
Japanese (ja)
Inventor
修 津下
宮原　逸雄
修三 伊東
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.)
Kobe Steel Ltd
Original Assignee
Kobe Steel 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 Kobe Steel Ltd filed Critical Kobe Steel Ltd
Priority to AU2011271929A priority Critical patent/AU2011271929A1/en
Priority to RU2013103510/02A priority patent/RU2013103510A/ru
Priority to CA 2801606 priority patent/CA2801606A1/en
Priority to US13/807,442 priority patent/US20130098202A1/en
Priority to CN2011800308731A priority patent/CN102959095A/zh
Publication of WO2012002338A1 publication Critical patent/WO2012002338A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/52—Manufacture of steel in electric furnaces
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/52—Manufacture of steel in electric furnaces
    • C21C5/5252—Manufacture of steel in electric furnaces in an electrically heated multi-chamber furnace, a combination of electric furnaces or an electric furnace arranged for associated working with a non electric furnace
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24—Binding; Briquetting ; Granulating
    • C22B1/242—Binding; Briquetting ; Granulating with binders
    • C22B1/244—Binding; Briquetting ; Granulating with binders organic
    • C22B1/245—Binding; Briquetting ; Granulating with binders organic with carbonaceous material for the production of coked agglomerates
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B5/00—General methods of reducing to metals
    • C22B5/02—Dry methods smelting of sulfides or formation of mattes
    • C22B5/10—Dry methods smelting of sulfides or formation of mattes by solid carbonaceous reducing agents
    • 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

Definitions

  • the present invention relates to a method for producing molten steel by melting granular metallic iron produced in a reduction melting furnace such as a rotary hearth furnace in an electric arc furnace.
  • iron materials such as scrap, pig iron (cold iron), and reduced iron are batch charged into the furnace with scrap buckets from the top of the furnace, and after melting, the furnace lid is opened and the iron materials are removed. Additional charging was performed in batches and the method of melting was taken. For this reason, there has been a problem of deterioration of the working environment in which heat loss and time loss and a large amount of dust are scattered outside the furnace during opening of the furnace lid and charging of the iron material.
  • pig iron cold iron
  • large-scale charging and melting cannot be realized by continuous charging.
  • oxygen addition operation has become established, the amount of oxygen used has increased, and the amount of carbon source used commensurate with the amount of oxygen input has also increased.
  • carbon in hot metal and cold iron As this carbon source, carbon in hot metal and cold iron, lump coke, powder coke, etc. are used.
  • this granular metallic iron has slag components removed in advance and can increase the carbon content, so it can be used together with oxygen blowing by continuously charging into an electric arc furnace instead of reduced iron.
  • the melting energy in the electric arc furnace can be greatly reduced and the productivity of molten steel can be greatly improved.
  • the present invention is a molten steel production that can be more efficiently melted when producing molten steel by continuously charging and melting granular metal iron produced in a reduction melting furnace such as a rotary hearth furnace into a steel arc furnace. It aims to provide a method.
  • the present invention provides a method for producing molten steel using the following granular metallic iron.
  • a step of heating a raw material containing a carbonaceous reducing material and an iron oxide-containing substance in a reduction melting furnace, solid-reducing the iron oxide in the raw material to produce metallic iron, and further heating the produced metallic iron A method for producing molten steel including a step of melting in an electric arc furnace all charged iron raw materials made of granular metal iron and other iron raw materials produced by a method including melting and aggregating while separating from slag components There, The content of carbon in the granular metallic iron is 1.0 to 4.5% by mass, and the carbon in the granular metallic iron is burned by using in combination with oxygen blowing.
  • the use rate of the granular metallic iron with respect to the total charged iron raw material is 40 to 80% by mass, and the other iron raw material is initially charged into the electric arc furnace to form molten iron, and then the granular metal is contained in the molten iron.
  • the granular metal iron is continuously charged into the molten iron while always forming the molten slag layer formed on the molten iron so as to cover the lower end of the electrode.
  • the manufacturing method as described in any one.
  • the granular metal iron produced in a reduction melting furnace and having a carbon content of 1.0 to 4.5 mass% is used in combination with oxygen blowing to burn carbon in the granular metal iron, 40-80% by mass of the total charged iron raw material was used, and this was melted by continuously charging it into molten iron made by initially charging other iron raw materials into the arc furnace. It has become possible to greatly reduce the energy and raise the energy efficiency of the electric arc furnace, and to greatly improve the productivity of molten steel.
  • FIG. 1 schematic structure of the molten steel manufacturing equipment which concerns on one Embodiment of this invention is shown.
  • the facility according to the present embodiment is an example of a case where a rotary hearth furnace 1 and an electric arc furnace 2 as a reduction melting furnace are installed in close proximity.
  • the granular metallic iron A used by this invention is manufactured as follows, for example.
  • a raw material containing a carbonaceous reducing material such as coal and an iron oxide-containing substance such as iron ore is agglomerated into pellets or briquettes. Then, this agglomerated material is placed on a hearth (not shown) on which carbon material C is laid, and heated in the rotary hearth furnace 1 to, for example, about 1350 to 1400 ° C. to reduce the iron oxide in the raw material to solid reduction. After that, the metallic iron to be produced is further heated to about 1400 to 1550 ° C. to be melted and agglomerated while being separated from the slag component. Thereafter, the mixture is cooled to about 1000 to 1100 ° C.
  • the carbon content in this granular metallic iron A is 1.0 to 4.5% by mass.
  • the reason why the lower limit of the carbon content is set to 1.0% by mass is to secure a necessary C amount according to the type of steel to be manufactured and to enhance versatility as an iron raw material.
  • the reason why the upper limit of the carbon content is 4.5% by mass is that the carbon content is used without weighting the load of additional processing such as decarburization processing.
  • a preferable range of the carbon content in the granular metallic iron A is 1.5 to 3.5% by mass.
  • the carbon content in the granular metallic iron A can be easily adjusted by adjusting the blending amount of the carbonaceous reducing material in the agglomerate and the atmosphere in the rotary hearth furnace 1.
  • the carbon in the granular metallic iron A is likely to gather near the surface of the granular metallic iron A.
  • A also has a higher carbon concentration near the surface.
  • the granular metallic iron A charged in the molten iron F of the electric arc furnace 2 starts to be easily melted from the vicinity of the surface having a high carbon concentration and a low melting point.
  • the carbon in the molten high carbon concentration molten iron is combusted with oxygen by using it together with oxygen blowing, that is, by blowing oxygen into the electric arc furnace 2, and the heat of combustion in the granular metal iron A
  • the high melting point portion with a low carbon concentration is also easily dissolved.
  • This granular metallic iron A and scrap D as another iron raw material are combined to make a total charged iron raw material, and the usage ratio of the granular metallic iron A to the total charged iron raw material is 40 to 80% by mass.
  • the scrap D is initially charged (batch charged) into the electric arc furnace 2 and arc-heated at the electrode 7 to be melted to produce molten iron F.
  • the reason why the use ratio of the granular metallic iron A to the total charged iron raw material is 40 to 80% by mass is as follows.
  • the carbon content of the granular metallic iron was 2.5% by mass.
  • FIG. 2 shows the change in dissolution energy required to dissolve the entire charged iron raw material due to the difference in the usage rate of granular metallic iron and the charging method.
  • FIG. 3 shows the change of the molten steel production rate by the difference in the usage rate of granular metal iron, and the charging method.
  • the usage rate of the granular metallic iron A is less than 40% by mass, that is, when the usage rate of the scrap D, which is another iron raw material, exceeds 60% by mass, the scrap due to the capacity restriction of a scrap bucket (not shown) for batch charging It becomes necessary to perform the initial charging of D in two steps, and as shown in FIG. 3, even if the granular metallic iron A is continuously charged, the molten steel production rate is greatly reduced.
  • the decarburization time is determined by the input power capacity of the arc furnace 2 when the granular metallic iron A is “high-temperature continuous charging”. Since it becomes longer than time and this decarburization time will determine the productivity of molten steel, as shown in FIG.
  • the ratio of the granular metallic iron A to the total charged iron raw material was 40 to 80% by mass.
  • the charging speed of the granular metallic iron A per 1 MW of input power is preferably 40 to 100 kg / min / MW for the following reasons.
  • a 500 kg high frequency induction furnace (rated: 350 kW, 1000 Hz), a raw material supply apparatus (hopper capacity: 200 kg, raw material charging speed: 0 to 15 kg / min), A monitor camera for observing the melting state and a data recording device for recording the molten metal temperature and the raw material charging speed were used.
  • the granular metal iron has a maximum dissolution rate of 2.5 to 3.0 times per 1 MW of input power compared to the reduced iron.
  • the maximum dissolution rate of granular metallic iron is 2.5 to 3.0 times the maximum dissolution rate of reduced iron in this way, because the amount of slag component contained in reduced iron is compared to that of granular metallic iron.
  • high-frequency induction heating was used instead of arc heating as a heating source for the dissolution test.
  • granular metal iron has an apparent density almost the same as that of molten iron, so it melts in a floating state in molten iron. Since molten iron is sufficiently heated by high frequency induction heating, the dissolution rate of granular metallic iron is sufficiently high.
  • reduced iron has almost the same density as molten slag, so it melts in a floating state in molten slag. Unlike arc heating, molten slag cannot be heated sufficiently by high-frequency induction heating. This is considered to be due to the fact that the dissolution rate of reduced iron is greatly reduced compared to granular metallic iron.
  • the melting test apparatus is as small as 500 kg, the heat loss is remarkably larger than that of a 90t electric arc furnace in actual operation. Therefore, the maximum melting per unit input power of granular metal iron obtained in the melting test is as follows. The speed is expected to be even greater when used in an actual arc furnace. Accordingly, the melting rate per 1 MW of the input power of the granular metal iron was estimated as follows when the granular metal iron was continuously charged into the 90t electric arc furnace in actual operation.
  • the melting power basic unit of the granular metallic iron in this melting test apparatus is 714 kWh / t when the charging speed is 4 kg / min, and 584 kWh when the charging speed is 7 kg / min. / T was obtained.
  • the maximum dissolution rate [R] per 1 MW of the input power of granular metallic iron is corrected by dividing by the input power efficiency [C] / 100, and the actual operation of 90 t In the electric arc furnace, the maximum dissolution rate per 1 MW of the input power of granular metallic iron was estimated (see the column of “Maximum dissolution rate after correction” in Table 2 above).
  • the maximum dissolution rate per 1 MW of input power of granular metallic iron varies depending on the carbon content and charging temperature of the granular metallic iron, but is in the range of 40 to 100 kg / min / MW. I know that there is. Therefore, it is recommended that the charging speed of granular metallic iron A per 1 MW of input power is 40 to 100 kg / min / MW.
  • the charging position of the granular metallic iron A on the molten iron F surface is preferably within the electrode pitch circle.
  • the apparent density of the granular metallic iron A according to the present invention is almost equal to the molten iron F
  • the granular metallic iron A introduced into the molten metal of the electric arc furnace 2 penetrates the molten slag layer E.
  • the molten iron layer F enters the molten iron layer F, and melting proceeds by arc heating through the molten slag layer E and the molten iron layer F.
  • heat transfer to the granular metallic iron A is insufficient, and there is a possibility that the undissolved residue of the granular metallic iron A is accumulated in the molten iron layer F. Arise.
  • the charging position of the granular metallic iron A on the molten iron F surface is within the electrode pitch circle, whereby the arc heat is more directly and efficiently transmitted to the granular metallic iron A and remains unmelted. Is prevented, and the productivity of the molten steel G is further improved.
  • the average particle diameter of the granular metallic iron A is preferably 1 to 50 mm.
  • a more preferable average particle diameter of the granular metallic iron A is 2 to 25 mm.
  • the average particle diameter is a mass average particle diameter calculated from the representative diameter between each sieve mesh and the mass between the sieve meshes after classification by a sieving method.
  • d k is a representative diameter between the meshes D k and D k + 1
  • d k (D k + D k + 1 ) / 2.
  • the molten slag layer E formed on the molten iron layer F is formed to melt while always covering the lower end of the electrode 7. Preferably it is done. Thereby, the heat of the arc can be transmitted to the molten iron layer F more efficiently without escaping to the upper space, and the dissolution rate of the granular metallic iron A is further improved.
  • the forming height of the molten slag layer E can be adjusted, for example, by blowing oxygen into the molten iron layer F and generating CO gas by decarburization reaction of carbon in the molten iron layer F.
  • the granular metallic iron A produced in the rotary hearth furnace 1 is continuously charged into the molten iron F of the electric arc furnace 2 at a high temperature of 400 to 700 ° C. without being cooled to room temperature.
  • the preferable charging temperature of the granular metallic iron A is set to 400 to 700 ° C. is as follows. That is, since a certain temperature is required from the viewpoint of effective utilization of sensible heat of the granular metallic iron A, the lower limit temperature is set to 400 ° C., and the granular metallic iron A, the slag component B, and the flooring carbon material C are separated by magnetic separation. At this time, since it is necessary to magnetize the granular metallic iron A, the upper limit temperature was set to 700 ° C. lower than the Curie temperature (770 ° C.) of iron.
  • N 2 or the like is preferably blown to create an inert gas atmosphere.
  • the rotary hearth furnace is exemplified as the furnace type of the reduction melting furnace, but a linear furnace may be used.
  • the agglomerated material formed by agglomerating a carbonaceous reducing material and an iron oxide containing material was illustrated as a raw material containing a carbonaceous reducing material and an iron oxide containing material, it does not agglomerate. These may be used in powder form.
  • the high temperature specification conveyor is exemplified as the high temperature state granular metal iron transfer device.
  • the insulated container may be transferred using a transfer carriage and a crane.
  • a rotary hearth furnace and an electric arc furnace were installed close was illustrated, when a rotary hearth furnace and an electric arc furnace are installed apart, a rotary hearth furnace If the granular metallic iron produced in step 1 is cooled to room temperature, the granular metallic iron is once melted and solidified, so it is denser than reduced iron, so there is no need to take special measures to prevent reoxidation. It can be transported to the electric arc furnace using ordinary transportation means.
  • scrap was illustrated as another iron raw material initially charged to an electric arc furnace, reduced iron or granular metal iron may be used, and these 2 or more types may be used together. .
  • the granular material continuously charged in the molten iron made from the other iron raw material initially charged is necessary to use 40 to 80% by mass of metallic iron with respect to the total charged iron raw material.
  • the ratio of the total granular metallic iron to the total charged iron raw materials is the initial charged amount. Since the ratio is the sum of the continuous charge, there is a possibility that the usage ratio is higher than 40 to 80% by mass. Therefore, it is necessary to adjust the total ratio to be 40 to 80% by mass.
  • the granular metal iron produced in a reduction melting furnace and having a carbon content of 1.0 to 4.5 mass% is used in combination with oxygen blowing to burn carbon in the granular metal iron, 40-80% by mass of the total charged iron raw material was used, and this was melted by continuously charging it into molten iron made by initially charging other iron raw materials into the arc furnace. It has become possible to greatly reduce the energy and raise the energy efficiency of the electric arc furnace, and to greatly improve the productivity of molten steel.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Manufacture Of Iron (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Manufacture And Refinement Of Metals (AREA)
PCT/JP2011/064717 2010-06-28 2011-06-27 粒状金属鉄を用いた溶鋼製造方法 Ceased WO2012002338A1 (ja)

Priority Applications (5)

Application Number Priority Date Filing Date Title
AU2011271929A AU2011271929A1 (en) 2010-06-28 2011-06-27 Process for producing molten steel using particulate metallic iron
RU2013103510/02A RU2013103510A (ru) 2010-06-28 2011-06-27 Способ получения жидкой стали с применением гранулированного металлического железа
CA 2801606 CA2801606A1 (en) 2010-06-28 2011-06-27 Process for producing molten steel using granular metallic iron
US13/807,442 US20130098202A1 (en) 2010-06-28 2011-06-27 Process for producing molten steel using granular metallic iron
CN2011800308731A CN102959095A (zh) 2010-06-28 2011-06-27 使用粒状金属铁的钢液制造方法

Applications Claiming Priority (2)

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JP2010-146114 2010-06-28
JP2010146114A JP2012007225A (ja) 2010-06-28 2010-06-28 粒状金属鉄を用いた溶鋼製造方法

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US (1) US20130098202A1 (ru)
JP (1) JP2012007225A (ru)
CN (1) CN102959095A (ru)
AU (1) AU2011271929A1 (ru)
CA (1) CA2801606A1 (ru)
RU (1) RU2013103510A (ru)
TW (1) TW201215682A (ru)
WO (1) WO2012002338A1 (ru)

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JP2014043645A (ja) * 2012-08-03 2014-03-13 Kobe Steel Ltd 金属鉄の製造方法
WO2014126495A1 (en) * 2013-02-13 2014-08-21 Siemens Aktiengesellschaft Apparatus and method for automatic controlling direct reduction process of iron oxide containing material
CN114829635A (zh) * 2019-12-25 2022-07-29 株式会社神户制钢所 钢水的制造方法

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CN102925610A (zh) * 2012-10-22 2013-02-13 西安桃园冶金设备工程有限公司 电-煤法熔分还原炼铁工艺
FI127179B (fi) * 2015-09-15 2017-12-29 Outotec Finland Oy Menetelmä ja järjestely uuniprosessin ominaisuuksien seuraamiseksi ja prosessiseurantayksikkö
JP6682932B2 (ja) * 2016-03-16 2020-04-15 日本製鉄株式会社 アーク式電気炉における金属溶解方法
JP6658241B2 (ja) * 2016-04-14 2020-03-04 日本製鉄株式会社 金属原料の溶解方法
KR102359738B1 (ko) * 2018-04-17 2022-02-09 닛폰세이테츠 가부시키가이샤 용강의 제조 방법
JP7094259B2 (ja) * 2019-11-21 2022-07-01 株式会社神戸製鋼所 溶鋼の製造方法
DE102020205493A1 (de) * 2020-04-30 2021-11-04 Sms Group Gmbh Verfahren zum Herstellen von flüssigem Roheisen aus einem DRI-Produkt
JP7588942B2 (ja) * 2021-12-22 2024-11-25 株式会社神戸製鋼所 電気炉への還元鉄装入方法

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JPS52101609A (en) * 1976-02-24 1977-08-25 Ishikawajima Harima Heavy Ind Co Ltd Arc furnace for continuous melting and refining of reduced iron
JPS5449913A (en) * 1977-09-29 1979-04-19 Nat Res Inst Metals Production of molten iron or molten steel
JPS5613420A (en) * 1979-07-12 1981-02-09 Nikko Sangyo:Kk Method and apparatus for rapid melting of direct-reduced iron
JPH07286208A (ja) * 1994-04-15 1995-10-31 Nippon Steel Corp スクラップ連続投入式アーク炉の操業方法
JPH1121607A (ja) * 1997-07-07 1999-01-26 Nkk Corp アーク炉操業方法
JPH11344287A (ja) * 1998-04-01 1999-12-14 Nkk Corp アーク炉操業方法
JP2001279315A (ja) * 2000-03-30 2001-10-10 Midrex Internatl Bv 粒状金属鉄の製法および該金属鉄を用いた溶鋼の製法
JP2002327211A (ja) * 2001-04-26 2002-11-15 Nkk Corp 冷鉄源の溶解方法

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014043645A (ja) * 2012-08-03 2014-03-13 Kobe Steel Ltd 金属鉄の製造方法
WO2014126495A1 (en) * 2013-02-13 2014-08-21 Siemens Aktiengesellschaft Apparatus and method for automatic controlling direct reduction process of iron oxide containing material
CN114829635A (zh) * 2019-12-25 2022-07-29 株式会社神户制钢所 钢水的制造方法
CN114829635B (zh) * 2019-12-25 2023-04-21 株式会社神户制钢所 钢水的制造方法

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RU2013103510A (ru) 2014-08-10
CA2801606A1 (en) 2012-01-05
CN102959095A (zh) 2013-03-06
JP2012007225A (ja) 2012-01-12
US20130098202A1 (en) 2013-04-25
AU2011271929A1 (en) 2013-01-10
AU2011271929A9 (en) 2013-07-25
TW201215682A (en) 2012-04-16

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