KR20020000605A - A method for reducing visible dust during pouring dephosphorized melts into ladle - Google Patents

A method for reducing visible dust during pouring dephosphorized melts into ladle Download PDF

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KR20020000605A
KR20020000605A KR1020000035396A KR20000035396A KR20020000605A KR 20020000605 A KR20020000605 A KR 20020000605A KR 1020000035396 A KR1020000035396 A KR 1020000035396A KR 20000035396 A KR20000035396 A KR 20000035396A KR 20020000605 A KR20020000605 A KR 20020000605A
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ladle
molten iron
converter
dust
visible dust
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KR1020000035396A
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Korean (ko)
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이승계
정기정
차학민
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이구택
포항종합제철 주식회사
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Publication of KR20020000605A publication Critical patent/KR20020000605A/en

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    • 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
    • C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
    • 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
    • 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
    • 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
    • C21C7/0006—Adding metallic additives

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

PURPOSE: A method for preventing visible dust in tapping dephosphorized hot metal from converter is able to decrease air pollution. CONSTITUTION: The method for preventing visible dust is characterized in that after dephosphorization of hot metal received in a converter by blowing, an additive containing Si or SiO2 is injected into a ladle within a range of 2.3 to 3.5Kg/ton-molten steel, wherein the additive is at least one selected from Fe-Si and silica.

Description

탈린 용선 출탕시 가시분진 발생 방지방법{A METHOD FOR REDUCING VISIBLE DUST DURING POURING DEPHOSPHORIZED MELTS INTO LADLE}A METHOD FOR REDUCING VISIBLE DUST DURING POURING DEPHOSPHORIZED MELTS INTO LADLE}

본 발명은 용선의 출탕시 분진 발생을 방지하는 방법에 관한 것으로, 보다 상세하게는 전로에서 탈린된 용선을 레이들내에 출탕시 가시분진(visible dust) 발생을 효과적으로 방지할 수 있는 방법에 관한 것이다.The present invention relates to a method of preventing dust generation during tapping of molten iron, and more particularly, to a method capable of effectively preventing visible dust when tapping molten iron desorbed from a converter into a ladle.

일반적으로 고로에서 출선된 용선을 전로에 출탕하기 전 예비처리공정에서 미리 탈린작업을 행하게 된다. 고로의 예비처리단계에서 탈린 작업을 행하게 되면 용선의 온도조절이나 탈린 반응 효율이 저하되는 단점 때문에 최근에는 직접 전로에서 취련을 통해 탈탄과 더불어 탈린작업을 행하고 있는 추세이다. 그러나, 전로에서 용선을 탈린작업을 행하게 되면 온도조절 등이 용이하다는 잇점은 있으나, 전로 탈린이 완료된 후 탈린된 용선을 레이들에 장입하기 위하여 출탕을 할 때 가시분진이 발생하여 환경오염을 야기하게 된다.In general, the delineation work is performed in advance in the pretreatment process before tapping the molten iron from the blast furnace to the converter. In the pre-treatment stage of the blast furnace, because of the disadvantages that the temperature control of the molten iron and the dephosphorization reaction efficiency is deteriorated, in recent years, there is a trend to perform dephosphorization and decarburization along with decarburization through direct blowing in the converter. However, there is an advantage that it is easy to control the temperature if decontamination of the molten iron in the converter is carried out.However, when the tapping is carried out to charge the ladle after decontamination of the molten iron, visible dust is generated, causing environmental pollution. do.

전로에서 용선의 출강시 발생되는 가시분진은 화학식1에 나타난 바와 같이, 대기중의 산소와 용선중의 탄소가 반응하여 발생되는 일산화탄소 기체에 의해 야기된다. 이때 발생된 일산화탄소 기체는 분위기 온도가 높기 때문에 급격한 속도로 상승하게 되고, 기체 상승시 주변에 존재하는 미세한 먼지 혹은 산화철 등과 함께 상승한다. 더욱이, 일산화탄소는 대기중에서 2차 산화하여 이산화탄소로 변화하기 때문에 지구 온난화 등의 환경문제를 일으킨다.As shown in Formula 1, the visible dust generated when the molten iron is pulled out of the converter is caused by the carbon monoxide gas generated by the reaction of oxygen in the atmosphere with carbon in the molten iron. At this time, the generated carbon monoxide gas rises at a rapid rate because the atmosphere temperature is high, and rises together with fine dust or iron oxide present in the surroundings when the gas rises. Moreover, carbon monoxide is converted into carbon dioxide by secondary oxidation in the atmosphere, causing environmental problems such as global warming.

2C + O2= 2CO(g)2C + O 2 = 2CO (g)

2CO(g) + O2= 2CO(g)2CO (g) + O 2 = 2CO (g)

한편, 대한민국 특허 제226920호에 의하면 분진을 발생시키지 않으면서 극저탄소 용강을 탈산처리 하는 방법이 제시되어 있다. 상기 특허에 의하면, 전로조업을 통해 1차 정련되어 레들에 출강된 0.002~0.04%의 탄소가 함유된 극저탄소용강을 진공탈가스 설비의 진공조를 이용하여 2차 정련하는 제강공정에 있어서 상기 극저탄소 용강중의 용존 탄소를 탈산한 직후, 상기 진공조의 내부에 CaC가 3%이상 함유되고 그 입자 크기가 3~30mm인 탈산제를 투입하여 극저탄소강을 탈산하는 방법에 관한 것이다. 그러나, 상기 특허는 진공조에서의 분진 발생 방지에 매우 효과적이지만, 분진이 다발로 발생되는 탈린 용선이 아닌 극저탄소 용강에 대하여 진공조에서의 분진 저감에 한정되고 있다.Meanwhile, Korean Patent No. 226920 discloses a method of deoxidizing ultra low carbon molten steel without generating dust. According to the patent, the ultra-low carbon molten steel containing 0.002% to 0.04% of carbon which is first refined through converter operation and then tapped onto the ladle is secondly refined in a steelmaking process using a vacuum tank of a vacuum degassing facility. Immediately after deoxidizing dissolved carbon in low carbon molten steel, it relates to a method of deoxidizing ultra low carbon steel by adding a deoxidizing agent containing 3% or more of CaC and a particle size of 3 to 30 mm in the interior of the vacuum chamber. However, the patent is very effective in preventing dust generation in a vacuum chamber, but is limited to dust reduction in a vacuum chamber for ultra low carbon molten steel, which is not a Tallinn molten iron in which dust is generated in a bundle.

이에 본 발명은 전로에서 탈린을 행한 후 탈린된 용선을 탈탄로에 장입하기 위하여 레이들에 출탕할 때 레이들에 첨가제를 투입하므로써, 출탕시 발생하는 가시분진을 효과적으로 저감시키는 방법을 제공하는데 그 목적이 있다.The present invention is to provide a method for effectively reducing the visible dust generated during tapping by adding an additive to the ladle when tapping the ladle in order to charge the delineated molten iron in the decarburization after the delineation in the converter. There is this.

도1은 본 발명의 첨가제의 첨가량에 따른 슬래그 발생정도와 용강의 승온정도를 보이는 그래프1 is a graph showing the degree of slag generation and the elevated temperature of molten steel according to the amount of the additive of the present invention added;

상기 목적달성을 위한 본 발명은 용선을 전로에 출선하여 전로 정련하는 방법에 있어서,In the present invention for achieving the above object in the method for refining the molten iron in the converter,

전로에 수선된 용선을 취련하여 탈린한 후, 탈린된 용선을 레이들에 출강할 때 Si를 포함한 첨가제를 용강 톤당 2.3~3.5Kg의 범위에서 레이들내에 투입하는 탈린 용선 출탕시 가시분진 발생 방지방법에 관한 것이다.After removing the molten iron from the converter and removing it, the method of preventing the occurrence of visible dust during the tapping of the molten iron in the ladle in which the additive containing Si is added to the ladle in the range of 2.3 to 3.5 kg per ton of molten steel when the molten iron is removed from the ladle. It is about.

이하, 본 발명에 대하여 상세히 설명한다.EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

우선, 본 발명은 용선의 종류에 관계없이 적용 가능하나, 바람직하게는 전로에서 탈린되어 레이들내에 출강되는 용선에 적용되면 분진 발생 방지에 더욱 효과적이다.First of all, the present invention is applicable regardless of the type of molten iron, but is preferably more effective in preventing dust generation when applied to molten iron which is derailed from the converter and pulled out in the ladle.

본 발명은 전로에 수선된 용선을 취련하여 탈린한 후, 탈린된 용선을 레이들에 출강할 때 SiO2를 포함한 첨가제를 투입함에 특징이 있다.The present invention is characterized by injecting an additive including SiO 2 when the molten iron is repaired in the converter, and then desorbed, and when the degreased molten iron is dropped into the ladle.

본 발명에 따라 전로로부터 용선을 레이들에 출탕할 때 탈린 용선중에 Si를 포함한 첨가제를 투입하게 되면 대기와 용선의 반응계면에 접촉을 차단하는 얇은 피막을 형성하므로써 대기중의 산소와 용선중의 탄소가 반응하지 못하도록 하여 분진 발생을 차단하게 된다. 물론 용강중의 탄소보다 산소 친화력이 강한 물질, 즉 Ca, Mn, Al, Ti 등을 첨가하여 탄소와의 반응을 억제할 수 있으나, 슬래그의 재화 등을 고려할 때 Si를 포함한 첨가제가 가장 양호하다.According to the present invention, when an additive containing Si is added to a molten molten iron when tapping a molten iron from a converter, the oxygen in the air and the carbon in the molten iron are formed by forming a thin film that blocks the contact between the atmosphere and the molten iron. This prevents the reaction from blocking dust generation. Of course, it is possible to suppress the reaction with carbon by adding a material having a stronger oxygen affinity than carbon in molten steel, that is, Ca, Mn, Al, Ti, etc., but the additive including Si is the best when considering slag goods.

상기 Si를 포함한 첨가제로는, 예를들면 규석, 규사 및 Fe-Si로 이루어진 그룹중에서 선택된 적어도 1종이상의 첨가제를 들 수 있다. 이들 첨가제들은 Si나 SiO2를 주성분으로 하므로 화학식2 내지 3과 같이, 탈탄로에서 투입되는 생석회와 반응하고, 이에따라 저융점의 복합산화물을 형성하여 슬래그의 재화를 촉진한다.Examples of the additive including Si include at least one additive selected from the group consisting of silica, silica and Fe-Si. Since these additives are mainly composed of Si or SiO 2 , as shown in Chemical Formulas 2 to 3, they react with quicklime introduced in a decarburization furnace, thereby forming a composite oxide having a low melting point, thereby promoting slag recycling.

Si + O2= SiO2(s)Si + O 2 = SiO 2 (s)

2Ca + O2= 2CaO(s)2Ca + O 2 = 2CaO (s)

그러나, 상기 첨가제는 필요이상 많은 양으로 투입하면 용강의 온도 상승에 따른 열적 부담이 발생할 뿐만아니라 슬래그량이 과다하게 발생하여 슬로핑(slopping)이 발생하여 바람직하지 못하다. 따라서, 이를 고려하여 본 발명의 경우 상기 첨가제는 용강 톤당 2.3~3.5Kg의 범위에서 레이들내에 투입하는 것이 바람직하며, 보다 바람직하게는 용강 톤당 약 3.0Kg으로 투입하는 것이다.However, when the additive is added in a larger amount than necessary, not only thermal burden occurs due to the temperature rise of the molten steel, but also excessive slag amount is generated, which is not preferable because of the slipping. Therefore, in consideration of this, in the case of the present invention, the additive is preferably added in the ladle in the range of 2.3 to 3.5 Kg per tonne of molten steel, and more preferably about 3.0 Kg per tonne of molten steel.

이하, 본 발명을 실시예를 통하여 구체적으로 설명한다.Hereinafter, the present invention will be described in detail through examples.

[실시예1]Example 1

300톤급 전로에서 용선을 정련하여 탈린처리하였다. 이때, 용선의 조성은 탈린처리 전에는 C: 4.5%, Si: 0.30%, Mn: 0.33%, P: 0.10%, S: 0.005%, 잔부 Fe이었으며, 탈린 후 용선중의 P 함량은 0.02% 정도였다. 탈린이 완료된 후의 용강의 온도는 약 1350℃이었다.The molten iron was refined in the 300-ton converter and desalted. At this time, the composition of the molten iron was C: 4.5%, Si: 0.30%, Mn: 0.33%, P: 0.10%, S: 0.005%, balance Fe, and the P content in the molten iron after de-lining was about 0.02%. . The temperature of the molten steel after Tallinn was completed was about 1350 degreeC.

상기 탈린된 용선을 레이들에 출탕하면서 Fe-Si를 용강 톤당 1.5~5Kg의 범위에서 레이들내에 투입하고, 그에 따른 용강의 승온 정도와 슬래그의 발생정도를 측정하여 그 결과를 도1에 나타내었다.Fe-Si was introduced into the ladle in the range of 1.5 to 5 kg per ton of molten steel while tapping the delineated molten iron on the ladle, and the resultant temperature was measured and the degree of slag generation was measured. .

도1에 나타난 바와 같이, 레이들내에 투입되는 Fe-Si의 양이 용강 톤당 3.5Kg이상일 때 용강중의 슬래그량이 40톤 이상으로 많아져 슬로핑이 발생하였다. 또한, Fe-Si의 양이 2.3Kg이하로 투입되면 용강의 온도가 60℃이상 승온되지 않아 바람직하지 않음을 알 수 있었다.As shown in Figure 1, when the amount of Fe-Si in the ladle is more than 3.5Kg per ton of molten steel, the amount of slag in the molten steel increases to more than 40 tons, the slope occurs. In addition, when the amount of Fe-Si is added below 2.3Kg, it was found that the temperature of the molten steel is not preferable because it is not heated to 60 ℃ or more.

[실시예2]Example 2

실시예1과 같이 탈린 용선을 전로로부터 레이들내로 출강하는 동안 각각 Fe-Si와 Si분말을 용강 톤당 3Kg씩 투입하고, 이때 발생되는 가시분진 발생 정도를 관측하고 그 결과를 표1에 나타내었다.In the same manner as in Example 1, Fe-Si and Si powders were added at 3 kg per ton of molten steel, respectively, while tapping molten iron from the converter into the ladle. The degree of visible dust generated at this time was observed and the results are shown in Table 1.

본 실시예에서 가시분진 발생 정도는 대형, 중형, 소형으로 구분하여 관측하였는데, 여기서 대형이라 함은 공장 외부로 분진이 배출되며 그 지속시간이 5분 이상인 경우를, 중형은 공장 외부로 분진이 배출되며 그 지속시간이 1분 이상 5분 미만인 경우를 그리고, 소형은 공장 외부로 분진 배출이 없거나 배출되더라도 1분 미만인 경우를 의미한다. 또한, 종래의 경우는 어떠한 첨가제를 투입하지 않은 경우이다.In this embodiment, the visible dust generation was observed by dividing into large, medium, and small, where large is dust discharged to the outside of the factory and the duration is more than 5 minutes, medium is dust discharged to the outside of the factory If the duration is more than 1 minute and less than 5 minutes, and the small size means less than 1 minute even if there is no dust discharged to the outside of the factory. In the conventional case, no additive is added.

구분division 적용횟수(charge 수)Application count (charge) 첨가제의 종류Type of additive 가시분진 발생횟수Number of visible dusts 분진 발생율(%)Dust generation rate (%) 대형large 중형Medium 소형small type 종래예Conventional example 2121 -- 1717 44 00 100100 발명예1Inventive Example 1 1717 SiO2 SiO 2 1One 44 22 4141 발명예2Inventive Example 2 1414 Fe-SiFe-Si 00 00 1One 77

표1에 나타난 바와 같이, 탈린 용선을 전로로부터 레이들에 출탕할 때 종래에는 100% 가시분진이 발생하였으나, SiO2를 투입한 발명예(1)의 경우 41% 정도 발생하였으며, Fe-Si를 투입한 발명예(2)의 경우 7% 정도만 발생되어 가시분진이 대폭 감소됨을 알 수 있었다.As shown in Table 1, 100% of the visible dust was conventionally generated when tapping the molten iron in the ladle from the converter, but in the case of Inventive Example (1) injected with SiO 2 , about 41% was generated. In the Invented Example (2), only about 7% was generated, and it was found that visible dust was greatly reduced.

상술한 바와 같이, 본 발명에 의하면 탈린 용선을 출탕하는 경우 대기중 산소와 용선중의 탄소의 반응에 의한 가시분진 발생을 대폭적으로 감소시킬 수 있으며, 이에 따라 정련작업성을 크게 개선할 뿐만아니라 지구 온난화 등 환경오염 문제 등을 개선하는 커다란 효과가 있다.As described above, according to the present invention, when tapping the molten molten iron, the generation of visible dust due to the reaction of oxygen in the air with carbon in the molten iron can be greatly reduced, thereby greatly improving the refining workability and the earth. There is a big effect to improve environmental pollution such as warming.

Claims (2)

용선을 전로에 출선하여 전로 정련하는 방법에 있어서,In the method of smelting the chartered ship in the converter, 전로에 수선된 용선을 취련하여 탈린한 후, 탈린된 용선을 레이들에 출강할 때 Si나 SiO2를 포함한 첨가제를 용강 톤당 2.3~3.5Kg의 범위에서 레이들내에 투입함을 특징으로 하는 탈린 용선 출탕시 가시분진 발생 방지방법After removing the molten iron from the converter, the molten iron is removed, and when the molten iron is removed from the ladle, an additive including Si or SiO 2 is introduced into the ladle in the range of 2.3 to 3.5 kg per ton of molten steel. How to prevent visible dust when tapping 제1항에 있어서, 상기 첨가제는 규석, 규사 및 Fe-Si로 이루어진 그룹중에서 선택된 적어도 1종이상임을 특징으로 하는 탈린 용선 출탕시 가시분진 발생 방지방법The method of claim 1, wherein the additive is at least one selected from the group consisting of silica, silica and Fe-Si.
KR1020000035396A 2000-06-26 2000-06-26 A method for reducing visible dust during pouring dephosphorized melts into ladle KR20020000605A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR950014325A (en) * 1993-11-09 1995-06-15 조말수 Refining agent for aluminum deoxidation steel
KR950018508A (en) * 1993-12-14 1995-07-22 조말수 Method of manufacturing carbon dioxide welding rod steel
KR960017864A (en) * 1994-11-30 1996-06-17 김만제 Slag preparation
KR970043125A (en) * 1995-12-05 1997-07-26 김종진 Slag deoxidation method of ultra low carbon molten steel
KR19990047461A (en) * 1997-12-04 1999-07-05 이구택 Method for deoxidizing ladle slag of aluminum deoxidized steel

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR950014325A (en) * 1993-11-09 1995-06-15 조말수 Refining agent for aluminum deoxidation steel
KR950018508A (en) * 1993-12-14 1995-07-22 조말수 Method of manufacturing carbon dioxide welding rod steel
KR960017864A (en) * 1994-11-30 1996-06-17 김만제 Slag preparation
KR970043125A (en) * 1995-12-05 1997-07-26 김종진 Slag deoxidation method of ultra low carbon molten steel
KR19990047461A (en) * 1997-12-04 1999-07-05 이구택 Method for deoxidizing ladle slag of aluminum deoxidized steel

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