KR100336853B1 - Converter reinforcing material using slag of linz donawitz converter - Google Patents

Converter reinforcing material using slag of linz donawitz converter Download PDF

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Publication number
KR100336853B1
KR100336853B1 KR1019970036496A KR19970036496A KR100336853B1 KR 100336853 B1 KR100336853 B1 KR 100336853B1 KR 1019970036496 A KR1019970036496 A KR 1019970036496A KR 19970036496 A KR19970036496 A KR 19970036496A KR 100336853 B1 KR100336853 B1 KR 100336853B1
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South Korea
Prior art keywords
converter
slag
mgo
reinforcing material
dolomite
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KR1019970036496A
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Korean (ko)
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KR19990012917A (en
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박상득
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주식회사 포스코
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/0003—Linings or walls
    • F27D1/0006—Linings or walls formed from bricks or layers with a particular composition or specific characteristics
    • 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
    • C21C5/42—Constructional features of converters
    • C21C5/44—Refractory linings

Abstract

PURPOSE: A converter reinforcing material using slag generated during refining hot metal in linz donawitz converter is provided. CONSTITUTION: The converter reinforcing material is prepared by adding CaMgCO3 and MgO to slag of linz donawitz converter, and it comprises T.Fe 15 to 25 wt.%, SiO2 10 to 15 wt.%, MgO 15 to 25 wt.%, MnO 2 to 5 wt.%, Al2O3 0.1 to 0.2 wt.%, P2O3 2.5 to 5.5 wt.%, S 0.1 to 0.2 wt.%, CaO and incidental impurities.

Description

엘디에스 전로 슬래그를 이용한 전로 보강재Converter reinforcement using LDS converter slag

본 발명은 LDS(Linze Donawitze Stirring) 전로에서 순산소 취입중에 생성되는 슬래그(Slag)에 MgO 및 백운석(CaMgCO3)을 조정 투입하여 중량물 장입으로 인해 파손되는 전로노체 부위의 보강재로 사용하는 슬래그를 이용한 전로 보강재에 관한 것이다.The present invention adjusts and inputs MgO and dolomite (CaMgCO 3 ) into slag generated during pure oxygen injection in a LDS (Linze Donawitze Stirring) converter using slag used as a reinforcement material of the converter body part damaged by the loading of heavy materials. It relates to converter reinforcement.

일반적으로 LDS 전로 조업은 주원료인 용선과 고철의 비율을 88∼95%로 사용하게 되어있으나 고생산성과 증산의 목적으로 저 HMR(Hot Metal Ratio)으로 조업하게 되어 고철량이 많게되어 그 중량에 의해 노체하부에 낙하되면서 내화물을 파손시키는 경향이 늘어나고 있다.In general, the LDS converter uses the ratio of molten iron and scrap as the main raw materials at 88 ~ 95%, but operates with a low HMR (hot metal ratio) for the purpose of high productivity and production capacity. The tendency to break the refractory is increasing as it falls to the lower part.

즉, Mg-C질의 내화물은 3000 회 정도면 장입측 하부에 영구장 연와가 노출이 되어 보강을 필요로 하며 그에따라 8시간에 800∼1500Kg/1회의 비율로 하기 표 1과 같은 니더(Kneader)재, Mg-C 질, 드라이 믹서 캐스터(Dry Mixer Caster) 등의 보강재를 투입하여 조업을 지속하고 있다.In other words, Mg-C refractories are exposed to the permanent long edges in the lower side of the charging side in about 3000 times and require reinforcement. Reinforcement materials such as ash, Mg-C quality, and dry mixer casters have been put into operation.

구 분division CaO(wt.%)CaO (wt.%) MgO(wt.%)MgO (wt.%) SiO2(wt.%)SiO 2 (wt.%) T.Fe(wt.%)T.Fe (wt.%) Pitch & Resin(wt.%)Pitch & Resin (wt.%) 기 타(wt.%)Other (wt.%) 니더재(소성 Dolomite 계)Kneader materials (firing Dolomite series) 5050 3030 1.51.5 1.01.0 1515 2.52.5 Mg-C 질(Mg Dolomite 계)Mg-C quality (Mg Dolomite type) 3535 4545 1.51.5 1.01.0 1515 2.52.5

상기와 같은 열간 보수재는 경화기구인 Pitch 와 Resin에 분말형태의 소성 Dolomite계나 Mg Dolomite계를 혼합하여 노내로 투입하여 로를 수회 경동하여 용손된 곳을 채우면서 경화시키는데 그 경화시간이 장시간 소요되어 생산성을 저하시키며 상기 재료가 고가인 이유로 원가상승의 주요인이 되는 문제점이 있었다.Such hot repair materials are mixed with powdered plastic Dolomite or Mg Dolomite based on Pitch and Resin, which are hardening mechanisms. There is a problem in that it is the main cause of the cost increase because the material is expensive.

상기와 같은 문제점을 해결하기 위하여 본 발명은 LDS 전로 노내정련중 발생하는 슬래그를 응집 조제하여 전로 노체의 내벽 연화의 용손부에 보강재로 사용할 수 있는 슬래그를 이용한 전로 보강재를 제공하는 것을 그 목적으로 한다.In order to solve the above problems, an object of the present invention is to provide a converter reinforcement using slag that can be used as a reinforcement in the molten portion of the inner wall of the converter furnace by coagulating the slag generated during the LDS converter furnace refining. .

본 발명은 상기와 같은 목적을 달성하기 위하여 종래 전로작업중 발생하여 폐기 처리되던 슬래그(Slag)에 백운석(CaMgCO3) 및 산화마그네슘(MgO)를 첨가하여 그 조성이 중량%로 T.Fe : 15∼25, SiO2: 10∼15, MgO : 15∼25, MnO : 2∼5, Al2O3: 0.1∼0.2, P2O3: 2.5∼5.5, S : 0.1∼0.2이고, 나머지가 불가피한 불순물 및 CaO로 구성되는 것을 특징으로 하는 LDS 전로 슬래그를 이용한 전로보강재를 제공하게 된다.In order to achieve the above object, the present invention adds dolomite (CaMgCO 3 ) and magnesium oxide (MgO) to slag, which is generated and disposed of during conventional converter operation, to a weight% of T.Fe: 15 to 25, SiO 2 : 10 to 15, MgO: 15 to 25, MnO: 2 to 5, Al 2 O 3 : 0.1 to 0.2, P 2 O 3 : 2.5 to 5.5, S: 0.1 to 0.2, and the rest is unavoidable impurity And to provide a converter reinforcement using the LDS converter slag, characterized in that consisting of CaO.

상기의 본 발명에서 MgO 또는 백운석(CaMgCO3)의 투입량은 슬래그내의 MgO의양이 15~25 중량%가 되도록 조절하는데, 그 이유는 MgO가 15중량% 이하이면 요구하는 점성을 충족하지 못하면 25중량% 이상이면 오히려 응고되어 제 역할을 수행하지 못하기 때문이다.In the present invention, the amount of MgO or dolomite (CaMgCO 3 ) is adjusted so that the amount of MgO in the slag is 15 to 25% by weight, because the MgO is not more than 15% by weight if it does not meet the required viscosity 25% by weight This is because if it is abnormal, it solidifies and cannot perform its role.

상기와 같은 본 발명은 기존 LDS 전로 조업과정에서 발생하던 중량%로 T.Fe : 15∼25, SiO2: 15∼25, CaO : 40∼50, MgO : 2∼5, MnO : 3∼5.5, Al2O3: 0.3∼0.8, P2O3: 2.5∼5.5, S : 0.1∼0.2인 슬래그에 점성증가의 역할을 하는 MgO의 함량을 높이기 위하여 MgO 또는 백운석(CaMgCO3)을 투입하여 전로내 용강의 출강작업 완료후에 전로를 수회 경동하여 노내연와의 용손된 부분을 채우면서 짧은 시간에 경화시키는 보강재로써 작용한다.The present invention as described above is the weight percent generated in the existing LDS converter operation process T.Fe: 15 to 25, SiO 2 : 15 to 25, CaO: 40 to 50, MgO: 2 to 5, MnO: 3 to 5.5, MgO or Dolomite (CaMgCO 3 ) was added to the slag with Al 2 O 3 : 0.3 to 0.8, P 2 O 3 : 2.5 to 5.5, S: 0.1 to 0.2 to increase the content of MgO that increases viscosity. After completing the tapping work of molten steel, the converter is tilted several times to fill the molten portion with the furnace internal lead and act as a reinforcing material to harden in a short time.

상기 조업중 MgO 또는 백운석(CaMgCO3)는 전로조업 말기 즉, 전로내 용강의 출강후에 투입하는데 그 이유는 정련중에 MgO 또는 백운석(CaMgCO3)을 투입하게 되면 용강중의 불순물인 인(P)과 황(S)을 제거하는 것을 저해하기 때문이다.MgO or dolomite (CaMgCO 3 ) during the operation is put at the end of the converter operation, that is, after the tapping of the molten steel in the converter because the MgO or dolomite (CaMgCO 3 ) during the refining process, the impurities in the molten steel (P) and sulfur This is because it inhibits the removal of (S).

이하 실시예를 통하여 본 발명을 보다 상세하게 설명한다.Hereinafter, the present invention will be described in more detail with reference to the following examples.

〈실시예〉<Example>

86∼92%의 용선에 8∼14%의 고철을 전로 노내에서 장입하여 정련을 실시하였다.Refining was carried out by charging 8-14% of scrap iron in a furnace of 86-92% in a converter furnace.

이 때 전로 정련 조업중에 첨가되는 냉각매용재는 동일하게 첨가하였으며 정련말기에 발생하는 슬래그의 조성과 상기 슬래그의 점성증가를 위하여 사용되는MgO 및 CaMgCO3를 첨가한 후의 슬래그의 조성을 표 2에 나타내었다.At this time, the coolant solvent added during the converter refining operation was added in the same manner, and the composition of slag generated at the end of refining and the composition of slag after adding MgO and CaMgCO 3 used for increasing the viscosity of the slag were shown in Table 2. .

구 분division T.FeT.Fe SiO2 SiO 2 CaOCaO MgOMgO MnOMnO Al2O3 Al 2 O 3 P2O5 P 2 O 5 SS 염기도basicity 종래슬래그Conventional slag 15~2515-25 12~2512-25 40~5040-50 2~52 ~ 5 3~5.53 ~ 5.5 0.3~0.80.3 ~ 0.8 2.5~5.52.5 ~ 5.5 0.1~0.20.1-0.2 1.5~3.01.5 ~ 3.0 발명슬래그Invention slag 15~2015-20 10~1510-15 40~5040-50 15~2515-25 2~5.52 ~ 5.5 0.2~0.30.2 ~ 0.3 2.5~5.52.5 ~ 5.5 0.1~0.20.1-0.2 3.3~6.03.3 ~ 6.0

상기 표 2에 나타난 바와 같은 본 발명의 슬래그가 담긴 전로를 수회 경동후조업을 재개한 결과를 하기 표 3에 나타내었다.Table 3 shows the results of resuming the after-stage operation of the converter containing the slag of the present invention as shown in Table 2 above.

구 분division 노내온도(℃)Furnace Temperature (℃) 전로경동횟수Conversion count 경화시간(Hr)Curing time (Hr) 부착수명(CH)Attachment Life (CH) 종래슬래그Conventional slag 16001600 7 ~ 87 to 8 22 33 발명슬래그Invention slag 16001600 7 ~ 87 to 8 1.51.5 1515 소성 DolomiteCalcined Dolomite 16001600 7 ~ 87 to 8 4.54.5 1010 Mg-DolomiteMg-Dolomite 16001600 7 ~ 87 to 8 4.54.5 1212

상기와 같은 본 발명에 의하여 종래에는 폐기처리되던 슬래그를 재활용함으로써 그에 따른 비용절감 및 보강재로써의 경화시간 및 지속시간 측면에서 종래의 것보다 훨씬 뛰어난 효과를 제공한다.By the present invention as described above it provides a far superior effect than the conventional in terms of cost reduction and curing time and duration as a reinforcing material by recycling the slag that was conventionally disposed.

Claims (1)

LDS 전로의 슬래그에 CaMgCO3및 MgO를 첨가하여 그 조성이 중량%로 T.Fe : 15∼25, SiO2: 10∼15, MgO : 15∼25, MnO : 2∼5, Al2O3: 0.1∼0.2, P2O3: 2.5∼5.5, S : 0.1∼0.2이고, 나머지가 불가피한 불순물 및 CaO로 구성되는 것을 특징으로 하는 LDS 전로 슬래그를 이용한 전로 보강재.CaMgCO 3 and MgO were added to the slag of the LDS converter, and the composition was T.Fe: 15-25, SiO 2 : 10-15, MgO: 15-25, MnO: 2-5, Al 2 O 3 : A converter reinforcing material using an LDS converter slag, which is 0.1 to 0.2, P 2 O 3 : 2.5 to 5.5, S: 0.1 to 0.2, and the remainder is composed of inevitable impurities and CaO.
KR1019970036496A 1997-07-31 1997-07-31 Converter reinforcing material using slag of linz donawitz converter KR100336853B1 (en)

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Publication number Priority date Publication date Assignee Title
KR100862799B1 (en) * 2002-08-02 2008-10-13 주식회사 포스코 Method for Preventing Slag Inclusion in Converter Steel Tapping
KR100946128B1 (en) * 2002-08-05 2010-03-10 주식회사 포스코 Method for Refining Molten Steel Using Converter

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR910006500A (en) * 1989-09-09 1991-04-29 정명식 Slag Coating Method for Protection of Furnace Wall

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR910006500A (en) * 1989-09-09 1991-04-29 정명식 Slag Coating Method for Protection of Furnace Wall

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