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WO2003029498A1 - Procede de pretraitement de fer fondu et procede de raffinage - Google Patents

Procede de pretraitement de fer fondu et procede de raffinage Download PDF

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Publication number
WO2003029498A1
WO2003029498A1 PCT/JP2002/010108 JP0210108W WO03029498A1 WO 2003029498 A1 WO2003029498 A1 WO 2003029498A1 JP 0210108 W JP0210108 W JP 0210108W WO 03029498 A1 WO03029498 A1 WO 03029498A1
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WO
WIPO (PCT)
Prior art keywords
hot metal
pretreatment
flux
blowing
dephosphorization
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/JP2002/010108
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English (en)
Japanese (ja)
Inventor
Hiroshi Hirata
Hiromi Ishii
Hiroaki Hayashi
Yuji Ogawa
Naoto Sasaki
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.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
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 Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to EP02772944.1A priority Critical patent/EP1457574B1/fr
Priority to KR1020047004598A priority patent/KR100658807B1/ko
Publication of WO2003029498A1 publication Critical patent/WO2003029498A1/fr
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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/068—Decarburising
    • 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
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/02—Dephosphorising or desulfurising
    • 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
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/04—Removing impurities other than carbon, phosphorus or sulfur
    • 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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0025—Adding carbon material
    • 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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • 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
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/30—Regulating or controlling the blowing
    • C21C5/32—Blowing from above

Definitions

  • the present invention relates to a hot metal pretreatment method for performing desiliconization and dephosphorization of hot metal using a refining vessel capable of being blown up and down, and a hot metal refining method for performing decarburization processing of hot metal after the hot metal pretreatment.
  • Hot metal pretreatment methods have been used. In the pretreatment of hot metal, it is common to initially perform a desiliconization process by adding a solid oxygen source such as iron oxide to the hot metal and then dephosphorizing by adding a dephosphorizing flux to the hot metal. there were.
  • a lime source was added as a flux to form a highly basic dephosphorized slag, and a solid oxygen source such as iron oxide was also added as a flux for dephosphorization.
  • a preliminarily dephosphorizing container a torpedo car or a ladle was used, and a method of preliminarily dephosphorizing by injecting a dephosphorizing flux into the hot metal contained therein was used. Note that the solid oxygen, iron oxide and that of oxygen contained in the (FeO, Fe 2 0 3) in a solid oxygen source, iron ore, Dust which need use as a flux or coolant mill A material containing iron oxide such as a scale 5.
  • a converter-type refining vessel capable of top-bottom blowing has been used as a hot metal pretreatment vessel, and hot metal pretreatment for simultaneous desiliconization and dephosphorization of hot metal has been used. It has come to be. Since strong stirring by top and bottom blowing is used, dephosphorization can be promoted even with slag having a low basicity, so that desiliconization and dephosphorization can be performed simultaneously. Since gaseous oxygen can be sufficiently used as an oxygen source, the temperature of the hot metal after the pretreatment is higher than in the conventional case where only solid oxygen is used or gas oxygen is used in a very small amount.
  • the pretreatment refining flux may be added to the refining vessel from above by means of injection, or by injection by adding the bottom blown gas into the hot metal as a carrier gas. By employing the flux injection, the dephosphorization efficiency in the pretreatment can be improved.
  • the lower the hot metal temperature at the end of pretreatment the higher the dephosphorization capacity. Therefore, even though the thermal margin can be improved by using gaseous oxygen in the pretreatment, if the hot metal temperature after the pretreatment is increased unnecessarily, the dephosphorization ability in the pretreatment is sufficiently exhibited. You cannot do that.
  • a carbon source is added to the hot metal during the hot metal pretreatment or decarburization refining, it can be used as a heat source during the decarburization process, and the heat tolerance of the refining can be increased.
  • a method of adding a carbon source during the decarburization process a method of adding lump anthracite from above is conceivable, but there is a problem that the outlet of the gas generated due to the upward flow of gas generated by blowing acid is large. .
  • decarburization [0108] In order to secure the basicity of the slag at the time, it is necessary to increase the amount of quicklime, which is not preferable.
  • Japanese Patent Application Laid-Open No. Sho 62-170409 discloses a method for improving the slag slag property (Mn ore or Flux mixed with calcium fluoride (fluorite) etc. is added to the upper part, and desiliconized flux (iron oxide) is blown into the hot metal, and a gas Z solid oxygen source is supplied to the hot metal surface while the desiliconized flux is supplied.
  • a method is described in which a carbon source is blown into the hot metal with a carrier gas after the completion of the desiliconization reaction to increase the carbon concentration of the hot metal.
  • the reason for adding CaO-based flux to the upper part is that when CaO-based flux containing iron oxide used for dephosphorization is injected into the hot metal together with the carbon source, the oxygen potential in the hot metal due to the carbon injection is increased. The reason is that the dephosphorization reaction is inhibited and the phosphorus content is reduced.
  • the present invention enables refinement without using fluorite in the hot metal pretreatment and decarburization processes, minimizes the formation of dephosphorization slag in the decarburization process, and efficiently adds a carbon source to the hot metal. It is an object of the present invention to provide a hot metal pretreatment method and a refining method for improving the heat tolerance. Disclosure of the invention
  • the amount of flux blown into the hot metal during the desiliconization reaction can be significantly reduced. Therefore, if the carbon source as a heat source is blown into the hot metal together with the carrier gas at the time of the desiliconization reaction, it becomes possible to add only the carbon source into the hot metal before the start of the flux blowing. Since the dephosphorizing flux containing lime-based components and the carbon source are not injected at the same time, the dephosphorization is not hindered by the injected carbon. In addition, by eliminating simultaneous injection of carbon source and iron oxide-based flux, This also has the effect of eliminating the risk of ignition due to the reaction between the carbon source and iron oxide.
  • the dephosphorization efficiency in the hot metal pretreatment is greatly improved and the refining is improved. It has been clarified that the overall thermal tolerance can be improved at the same time.
  • the present invention has been made based on the above findings, and the gist thereof is as follows.
  • a flux containing one or more of quick lime, limestone, and iron oxide and containing at least iron oxide as a main component is blown into the hot metal to remove hot metal.
  • a hot metal pretreatment method for performing silicon dephosphorization wherein a carbon source is blown into the hot metal during the desiliconization reaction, and the carbon source blowing is started before the flux blowing is started.
  • FIG. 1 is a schematic view showing a hot metal pretreatment furnace used in the present invention.
  • a refining vessel 1 that can be blown up and down as shown in FIG. 1 is used.
  • the top blowing mainly blows oxygen gas 8 from the tip of the top blowing lance 3 onto the surface of the hot metal.
  • the top-blown oxygen used during the desiliconization reaction can be used as an oxygen source for desiliconization.
  • the upper blowing is used to increase the oxygen potential of the slag to prevent re-phosphorus, and to supplement the heat dissipated to control the temperature to a predetermined temperature.
  • the bottom blowing is performed using a bottom blowing nozzle 2 provided at the bottom of the purification vessel 1.
  • a bottom blowing nozzle 2 provided at the bottom of the purification vessel 1.
  • it also has the function of blowing flux 9 together with carrier gas 7 from the bottom blow nozzle 2 into the hot metal.
  • top and bottom blown converters are used, one of them can be used for hot metal pretreatment and the other can be used for decarburization.
  • Preliminary treatment is performed in a converter for hot metal pretreatment, and then the hot metal is transferred to a converter for decarburization to perform decarburization.
  • the flux blown into the hot metal together with the carrier gas is one or more of quick lime, limestone, and iron oxide, and is a flux mainly containing a component containing at least iron oxide.
  • the flux used for dephosphorization contains CaO sources such as quicklime and limestone as well as iron oxide.
  • a flux containing iron oxide as a main component may be blown as a desiliconization aid.
  • iron oxide used as a flux component Various materials such as iron ore, mill scale, and sintering dust can be used.
  • the desiliconization reaction in the hot metal pretreatment is mainly performed using top-blown gaseous oxygen as the oxygen source.
  • a flux containing iron oxide may be blown together with the carrier gas during the desiliconization reaction and used as an auxiliary oxygen source for desiliconization, but even in that case, only gaseous oxygen is used as the oxygen source at the beginning of the desiliconization. Desiliconization, and do not blow the desiliconization flux.
  • a carbon source is blown into the hot metal from the bottom blow nozzle together with the carrier gas.
  • the carbon source anthracite powder ⁇ coatus powder or the like can be used.
  • the carbon source blowing is started. Therefore, there is always a time when the carbon source is blown without blowing the flux. Since the carbon source is injected alone, the problem of dephosphorization obstruction that occurs when the carbon source is injected simultaneously with the dephosphorization flux does not occur.
  • the hot metal temperature during and after the desiliconization reaction should be higher than before. I can do it. Therefore, slagging of the injected flux can be promoted, and the dephosphorization reaction during hot metal pretreatment can be significantly promoted.
  • the flux injection start timing may be at any time during the desiliconization reaction. At least at the end of the desiliconization reaction, blow in the flux. Otherwise, the dephosphorization reaction following the desiliconization reaction cannot be performed smoothly.
  • the means for determining the [Si] concentration during desiliconization may be determined by estimating the amount of desiliconization from the amount of acid supply and the efficiency of desiliconization reaction based on the initial molten iron [Si] value.
  • the effect of the present invention can be enjoyed even if there is a time when the carbon source and the flux are simultaneously blown during the desiliconization reaction.
  • the blowing of the flux is started after the blowing of the carbon source is completed, the waste of the dephosphorizing flux due to the simultaneous blowing of the dephosphorizing flux and the carbon source is reduced. This is more preferable because it can eliminate the risk of ignition that can be avoided when simultaneously injecting a flux containing iron oxide and a carbon source at the same time.
  • the hot metal temperature after the desiliconization reaction is high and the slag of the dephosphorized slag is good, so that the subsequent dephosphorization reaction proceeds well.
  • the carbon source is blown, the heat tolerance of refining can be increased, so that the hot metal temperature at the end of dephosphorization after hot metal pretreatment can be lowered.
  • a predetermined dephosphorization reaction is performed without using fluorite for hot metal pretreatment. 2/10108
  • the dephosphorization ability in the hot metal pretreatment is excellent, it is not necessary to perform an additional dephosphorization treatment in the decarburization treatment. Therefore, as described in the above (5) of the present invention, it becomes possible to reduce the phosphorus concentration in the molten steel to a predetermined concentration without using fluorite for the decarburization treatment.
  • top blowing oxygen gas 8 is blown onto hot metal 5 using top blowing lance 3.
  • bottom blowing six double pipe bottom blowing nozzles 2 provided at the bottom of the converter are used, and oxygen gas or inert gas is blown into the hot metal from the inner pipe. From the space between the inner tube and the outer tube, a hydrocarbon gas is blown as a cooling gas when oxygen gas is blown from the inner tube, and an inert gas such as nitrogen is blown when an inert gas is blown from the inner tube.
  • the flux 9 stored in the flux hopper 4 can be blown together with the carrier gas 7 from the bottom blowing tuyere 2.
  • a carbon source 9c, quicklime 9a, and sintered dust 9b are used.
  • Si0 using 2 6.7 wt% anthracite.
  • a mixture of quicklime powder 9a and sintered dust 9b in a mass ratio of 1: 1 or sintered dust 9b alone was used.
  • the particle size of the blowing material was set to 1.5 ⁇ or less.
  • the top blowing during the degassing reaction time increased the oxygen potential of the slag 6 to prevent reversion, and set the flow rate so as to compensate for the heat dissipated and control the temperature to a predetermined temperature.
  • Table 1 shows the injection status of the flux of carbon source and flux mainly in the pretreatment in each example.
  • Table 2 shows the detailed basic unit, component and temperature results for each example. Examples 1 and 2 of the present invention are examples to which the present invention is applied, and Comparative Examples 1 to 4 are examples using the conventional technology.
  • Pretreatment furnace Decarburization furnace Desiliconization period Dephosphorization period End temperature
  • Comparative Example 2 Sintered dust injected Ca0 + Sintered dust Normally carbon material added Injection (added above lump) Comparative Example 3 Fluxes Fluxes Normally carbonaceous material added No blown None Comparative Example 4 Fluxes Fluxes Finish temperature Carbon material added No blowing No blowing Up None
  • Example 1 of the present invention desiliconization was performed only by the upwardly blown oxygen during the desiliconization reaction time, while a carbon source was blown over the entire desiliconization reaction time.
  • a carbon source was blown over the entire desiliconization reaction time.
  • quicklime powder and a sinter dust mixture were blown in as fluxes for dephosphorization.
  • the blowing of the carbon source was completed before the [S i] concentration was reduced to 0.15% by mass, and the dephosphorization was completed after the [S i] concentration was reduced to 0.15% by mass.
  • quicklime powder and a sinter dust compounding agent were injected. The other conditions are the same as in Example 1 of the present invention.
  • Comparative Example 1 a carbon source and a sintering dust were blown from the bottom during the desiliconization reaction, and both the top-blown oxygen and the sintering dust were used as the desiliconization oxygen source. At the time of the dephosphorization reaction, quicklime powder and a sintering dust mix were blown in as flux for dephosphorization.
  • the carbon source was not injected during the desiliconization reaction time of the hot metal pretreatment, but instead lump anthracite was injected from above during the decarburization treatment.
  • Comparative Example 1 As in Comparative Example 2, [S i] and [C] in the hot metal reacted with the iron oxide in the sintered dust, and this was an endothermic reaction. In Comparative Example 1, since a carbon source was blown during the desiliconization reaction, [C] in the hot metal was always kept saturated. Since the reaction between [C] and iron oxide proceeds as the [C] concentration increases, the reaction between [C] and iron oxide proceeds more than in Comparative Example 2, and the degree of temperature decrease during the desiliconization reaction becomes larger.
  • Example 1 of the present invention the desiliconization reaction is performed using only the top-blown oxygen gas without blowing sintering dust during the desiliconization reaction time. Since the reaction between the hot metal [Si] and the oxygen gas is an exothermic reaction, the calorific value is larger than in Comparative Examples 1 and 2, and the hot metal temperature at the end of the desiliconization reaction can be increased. carbon The fact that [C] is kept saturated by the source injection makes it easy to reduce FeO in the slag as in Comparative Example 1. can be FeO production amount by many, to retain the slag FeO -Si 0 2 slag of low melting point. For the above reasons, in Example 1 of the present invention, the slag at the end of the desiliconization reaction can be made into a slag with good slagging, and the subsequent degassing reaction can advantageously proceed. .
  • Example 1 of the present invention at the time of the desiliconization reaction, since the desiliconization reaction is performed only with the top-blown oxygen without blowing the iron oxide-based flux, the hot metal temperature at the start of the dephosphorization reaction is high. Furthermore, since the dephosphorization flux added during the dephosphorization reaction is blown into the hot metal together with the carrier gas instead of being injected upward, the synergistic effect with the hot metal temperature gap makes it unnecessary to use fluorite. A dephosphorization reaction can proceed. Also, since the carbon source injection and the dephosphorization flux injection are performed at different times, the injected carbon source does not inhibit dephosphorization.
  • the temperature at the end of the hot metal pretreatment was kept at 1339 ° C, so that the [P] concentration after the treatment could be reduced to 0.012% by mass. For this reason, it is not necessary to perform additional dephosphorization in the subsequent decarburization treatment, but decarburization treatment was performed by generating 20 kg / t slag to reduce dust. Since fluorite was not added, there was no concern about elution of fluorine from the slag, and the slag could be effectively used. [Carbon source blowing was completed before the [Si] concentration dropped to 0.15% by mass, and dephosphorizing flux blowing was started. This makes it possible for the dephosphorization reaction to proceed even in the latter half of the desiliconization reaction.
  • Comparative Example 2 since the carbon source was not blown during desiliconization in comparison with Comparative Example 1, the [P] concentration after the pretreatment was 0.016% by mass, which was slightly better than Comparative Example 1. . Because the carbon source is not injected, the oxygen potential can be increased. On the other hand, there are S i0 2 Inpu' bets from anthracite was introduced by decarburization. Therefore, it was necessary to increase the amount of slag to 35 kg / t for the slag basicity secure.
  • Comparative Example 3 since the carbon source was not added, the heat tolerance was insufficient and Mn ore could not be added.
  • Comparative Example 4 although the pre-treatment end temperature was raised to improve the heat tolerance, the heat tolerance decreased due to the large amount of slag generated in the decarburization treatment, and the Mn ore was reduced to 5 kg / min. Only t could be added.
  • Examples 1 and 2 of the present invention a solid oxygen source was not used for desiliconization, and a flux blown into hot metal was used for dephosphorization, so that a high dephosphorization capacity was achieved in the pretreatment. I was able to.
  • carbon source is blown into the separate timing before the dephosphorization flux is blown during the desiliconization, carbon is added to the hot metal at a high yield without impairing the dephosphorization ability, and the heat tolerance of refining could be increased.
  • Example 1 Under the conditions of Example 1 and Comparative Example 3, continuous operation was performed for each of 20 channels, and the amount of refractory erosion was compared. As a result, it was confirmed that in Example 1, which did not use fluorite, the amount of erosion loss of the decarburization furnace refractories was 30% less than that of Comparative Example 2, which used 5 kg / t of fluorite in the decarburization furnace. It helped to reduce refractory costs.
  • the present invention relates to a hot metal refining method in which decarburization is performed after hot metal pretreatment in which desiliconization and dephosphorization is performed using a top and bottom blown refining vessel.
  • a carbon source is blown into the hot metal and then a dephosphorizing flux is blown, so that carbon can be added to the hot metal at a high yield to increase the heat tolerance of refining.
  • Sa Furthermore, a high dephosphorization ability can be realized in the pretreatment.
  • the degassing flux is started after the [Si] concentration has dropped to 0.15% by mass, the dephosphorization reaction can be caused even during the desiliconization reaction, and The ability to remove phosphorus can be improved.
  • the present invention is to increase the thermal tolerance of refining by adding carbon into hot metal at a high yield without impairing the dephosphorization ability by starting the dephosphorization flux injection after the carbon source injection. And the risk of ignition can be avoided.
  • the present invention is to perform the purification without using the fluorite in the hot metal pretreatment and without using the fluorite even in the decarburization process. Becomes possible. Thereby, the amount of refractory erosion can be reduced and the cost of refractory can be reduced.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

L'invention concerne un procédé de prétraitement de fer fondu faisant intervenir une cuve de raffinage à soufflage par le haut. Selon l'invention, la désiliconisation et la déphosphoration du fer fondu sont effectuées par soufflage d'un flux comportant un composant primaire contenant de l'oxyde de fer et de l'oxyde de calcium et/ou du calcaire, dans le fer fondu. Ledit procédé est caractérisé en ce qu'une source de carbone est soufflée dans le fer fondu lors de la désiliconisation, et le soufflage de la source de carbone précède le soufflage du flux. Le soufflage du flux démarre de préférence après qu'une concentration de [Si] est ramenée à 0,15 % en poids et/ou après achèvement du soufflage de la source de carbone. Ledit procédé permet de s'affranchir de l'utilisation de spathfluor lors du prétraitement du fer fondu et des étapes de décarbonation, de minimiser la formation de scories de déphosphoration dans l'étape de décarbonation, et d'augmenter le degré de réduction de chaleur par addition d'une source de carbone au fer fondu.
PCT/JP2002/010108 2001-09-27 2002-09-27 Procede de pretraitement de fer fondu et procede de raffinage Ceased WO2003029498A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP02772944.1A EP1457574B1 (fr) 2001-09-27 2002-09-27 Procede de pretraitement de fer fondu et procede de raffinage
KR1020047004598A KR100658807B1 (ko) 2001-09-27 2002-09-27 용선의 전처리 방법 및 정련 방법

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001295874A JP3854482B2 (ja) 2001-09-27 2001-09-27 溶銑の予備処理方法及び精錬方法
JP2001-295874 2001-09-27

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WO2003029498A1 true WO2003029498A1 (fr) 2003-04-10

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KR100909691B1 (ko) * 2002-12-18 2009-07-29 주식회사 포스코 진공탈가스설비에서 고순도 산화철을 이용한 용강탈린방법
JP4735169B2 (ja) * 2005-09-30 2011-07-27 Ｊｆｅスチール株式会社 溶銑の脱燐処理方法
JP5689024B2 (ja) * 2010-06-07 2015-03-25 株式会社神戸製鋼所 ダストを使用した溶銑の脱りん方法
US9493854B2 (en) 2011-12-20 2016-11-15 Jfe Steel Corporation Converter steelmaking method
JP5979017B2 (ja) * 2012-01-19 2016-08-24 Ｊｆｅスチール株式会社 溶銑の精錬方法
CN115574554A (zh) * 2022-09-27 2023-01-06 首钢集团有限公司 一种石灰粉干燥装置、转炉及石灰粉喷吹方法

Citations (4)

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JPS60221511A (ja) * 1984-04-17 1985-11-06 Nippon Steel Corp 溶鉄加炭溶解精錬法
JPH02228412A (ja) * 1989-02-28 1990-09-11 Kobe Steel Ltd 溶銑予備処理方法
JPH07278636A (ja) * 1994-04-13 1995-10-24 Nippon Steel Corp 溶銑の脱珪方法
JPH0920914A (ja) * 1995-06-30 1997-01-21 Nippon Steel Corp 溶銑の予備処理方法

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62170409A (ja) * 1986-01-21 1987-07-27 Kobe Steel Ltd 溶銑の予備処理方法
DE69423630T2 (de) * 1993-06-30 2000-11-09 Nippon Steel Corp., Tokio/Tokyo Stahlherstellung im konverter mit entphosphorungsstufe

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60221511A (ja) * 1984-04-17 1985-11-06 Nippon Steel Corp 溶鉄加炭溶解精錬法
JPH02228412A (ja) * 1989-02-28 1990-09-11 Kobe Steel Ltd 溶銑予備処理方法
JPH07278636A (ja) * 1994-04-13 1995-10-24 Nippon Steel Corp 溶銑の脱珪方法
JPH0920914A (ja) * 1995-06-30 1997-01-21 Nippon Steel Corp 溶銑の予備処理方法

Also Published As

Publication number Publication date
KR100658807B1 (ko) 2006-12-19
EP1457574A4 (fr) 2006-02-15
EP1457574B1 (fr) 2018-05-30
JP3854482B2 (ja) 2006-12-06
JP2003105418A (ja) 2003-04-09
EP1457574A1 (fr) 2004-09-15
KR20040033326A (ko) 2004-04-21

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