KR100349173B1 - Slag coating method for protection of torpedo ladle car linig refractories - Google Patents

Slag coating method for protection of torpedo ladle car linig refractories Download PDF

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KR100349173B1
KR100349173B1 KR1019970069249A KR19970069249A KR100349173B1 KR 100349173 B1 KR100349173 B1 KR 100349173B1 KR 1019970069249 A KR1019970069249 A KR 1019970069249A KR 19970069249 A KR19970069249 A KR 19970069249A KR 100349173 B1 KR100349173 B1 KR 100349173B1
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magnesia
slag
ladle car
torpedo ladle
car
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KR1019970069249A
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Korean (ko)
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KR19990050186A (en
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정두화
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주식회사 포스코
재단법인 포항산업과학연구원
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/12—Travelling ladles or similar containers; Cars for ladles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/02—Linings

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Abstract

PURPOSE: A slag coating method for protecting lining refractories of furnace wall in torpedo ladle car is provided to lengthen the life span of the furnace wall lining refractories of the torpedo ladle car by coating a molten mixture of residual slag and magnesia material on the operating surface of the furnace wall lining refractories of the torpedo ladle car. CONSTITUTION: In a method for protecting furnace wall lining refractories(12) made of alumina-silicon carbide-carbon material of torpedo ladle car(10) for pretreating and transporting molten iron, the slag coating method for protecting lining refractories of furnace wall in torpedo ladle car comprises the processes of discharging the pretreated molten iron from the torpedo ladle car; injecting 2 to 5 wt.% of magnesia material for the residual slag weight into slag remained in the torpedo ladle car, and maintaining the magnesia material together with the residual slag in the torpedo ladle car for 10 to 20 minutes so that the magnesia material is melted into the residual slag in the torpedo ladle car; and tilting the torpedo ladle car using a torpedo ladle car tilting apparatus(13) so that slag coating layer(3) is formed by coating slag on the operating surface of the furnace wall lining refractories, wherein the magnesia material is a material selected from the group consisting of sintered seawater magnesia clinker, natural sintered magnesia clinker, crushed materials of firebricks made of magnesia-carbon of waste refractories generated from steelmaking, and waste of spray material made of magnesia.

Description

혼선차 노벽내화물 보호를 위한 슬래그 코팅방법{Slag coating method for protection of torpedo ladle car linig refractories}Slag coating method for protection of torpedo refractories {Slag coating method for protection of torpedo ladle car linig refractories}

본 발명은 용선을 예비처리하여 운반하는 혼선차의 노벽내화물의 보호방법에관한 것으로, 보다 상세하게는 혼선차 노벽내화물의 가동면에 잔존하는 슬래그와 마그네사이질 원료의 용융혼합물을 코팅하여 혼선차의 노벽내화물의 장수명화를 위한 코팅방법에 관한 것이다.The present invention relates to a method for protecting the furnace wall refractory material of a mixed car, which is carried out by pretreatment of molten iron. More specifically, the molten mixture of slag and magnesium raw material remaining on the movable surface of the mixed car furnace wall refractory is coated. It relates to a coating method for long life of the furnace wall refractory.

고로-전로간 용선의 운반은 혼선차(Torpedo Ladle Car)에 의해 이루어지고 있으며, 최근 전로조업의 부하를 경감시키기 위해 혼선차에서 용선예비처리(탈인, 탈류)가 실시되고 있다.The transfer of the blast furnace-to-conduction charter is carried out by Torpedo Ladle Car, and in order to reduce the load of the converter operation, a charter preliminary treatment (dephosphorization, dehydration) has been carried out in the hybrid car recently.

혼선차에서 사용하는 내화물은 Al2O3-SiC-C질 불소성 내화벽돌이 주류를 이루고 있다. 이러한 Al2O3-SiC-C질 내화물도 혼선차의 기능이 용선운반 기능뿐만 아니라 용선예비처리 기능이 추가되면서 점점 고급화되고 있는 추세이다.The refractory used in the crossroad car is mainly composed of Al 2 O 3 -SiC-C fluorine refractory bricks. The Al 2 O 3 -SiC-C quality refractory material is also increasingly advanced as the function of the crossroad car is added to the molten iron transportation function as well as the molten iron transportation function.

혼선차의 용선예비처리 공정은 일반적으로 탈규-탈류 또는 탈규-탈인-탈류 순으로 진행되는데, 탈규처리제로서는 밀 스케일(mill scale, FeO계), 탈류 및 탈인 처리제로서는 FeO-CaO-CaF2계, Na2CO3계 등이 사용되고 있다. 용선처리제는 혼선차 내화물과 격렬한 반응을 하기 때문에 용선예비처리율이 높아질수록 내화물의 사용수명은 감소하게 된다. 이러한 문제를 해소하기 위해 현재까지는 내화물의 재질을 고급화하거나 노수리시 보수재를 사용하는 것으로 대응해 왔으나, 보수재의 코팅보수 및 재질적 보완으로는 이제 한계에 이르렀다.Hot metal pre-treatment process of the crosstalk difference is generally talgyu-desulfurized or talgyu-dephosphorization-desulfurization there is net proceeds to, talgyu agent as mill scale (mill scale, FeO based), desulfurization and dephosphorization treatment agent as FeO-CaO-CaF 2 based, Na 2 CO 3 system and the like are used. The molten iron treatment agent reacts violently with the cross-car refractory material, and as the molten iron preliminary treatment rate increases, the service life of the refractory material decreases. In order to solve this problem, up to now, the material of refractory materials has been upgraded or repaired at the time of repair, but the repair and coating of the repair materials and material supplements have reached its limit.

본 발명은 상기의 문제점을 해결하기 위한 것으로, 조업시 발생되는 혼선차 슬래그를 개질하여 혼선차의 노벽내화물에 코팅함으로써 이 코팅층이 노벽내화물을보호하도록 하여 내화물을 장수명화하는데, 그 목적이 있다.The present invention has been made to solve the above problems, by modifying the crosstalk slag generated during the operation to coat the furnace wall refractory material of the crosstalk car, so that the coating layer to protect the furnace wall refractory life, the object is long life.

도 1은 혼선차에 장입된 용선을 배선하고, 잔존하는 슬래그상부에 마그네시아질 원료를 투입한 상태를 나타내는 개략도1 is a schematic diagram showing a state in which a molten iron charged into a cross talk car is wired, and a magnesia raw material is introduced into the remaining slag upper part.

도 2는 혼선차의 잔존슬래그에 투입된 마그네시아를 용융시킨후 혼선차를 경동시켜 슬래그를 코팅시킨 상태를 나타내는 개략도2 is a schematic view showing a state in which slag is coated by melting the magnesia introduced into the remaining slag of the crosstalk car and then tilting the crosstalk car.

도 3은 실험실적 침식시험시 마그네시아를 투입하여 실험한 시편을 나타내는 모식도Figure 3 is a schematic diagram showing the specimen tested by the injection of magnesia in the laboratory erosion test

도 4는 실험실적 침식시험시 마그네시아를 투입하지 않고 실험한 시편의 상태를 나타내는 모식도Figure 4 is a schematic diagram showing the state of the specimen tested without the injection of magnesia in the laboratory erosion test

*도면의 주요부분에 대한 부호의 설명** Description of the symbols for the main parts of the drawings *

1... 슬래그 2....마그네시아질 원료 3...슬래그 코팅층1 ... slag 2 .... magnesia raw material 3 ... slag coating layer

10...혼선차 12...노벽내화물 13...혼선차 경동장치10 Crosstalk 12 Road refractory 13 Crosstalk tilting device

상기 목적을 달성하기 위한 본 발명은, 용선을 예비처리하고 운반하는 혼선차의 알루미나-탄화규소-카본질 노벽내화물 보호 방법에 있어서, 상기 혼선차에서 예비처리된 용선을 배선한 후 혼선차에 잔존하는 슬래그에 마그네시아질 원료를 투입하여 용융시키고, 이어 혼선차를 경동하여 슬래그를 노벽내화물의 가동면에 코팅하는 것을 포함하여 구성된다.In order to achieve the above object, the present invention provides a method for protecting alumina-silicon carbide-carbon furnace wall refractory material of a cross-car for pretreating and transporting molten iron, wherein the molten iron pre-treated in the cross-car is wired and remains in the cross-car. Magnesium material is added to the slag to melt the molten, and then the slag is coated on the movable surface of the furnace wall refractory material by tilting the crosstalk difference.

이하, 본 발명을 상세히 설명한다.Hereinafter, the present invention will be described in detail.

본 발명은 혼선차의 용선을 배선한 직후 혼선차 내부에 잔존하는 슬래그 상부에 마그네시아질 원료를 투입하여 MgO성분이 부하된 슬래그를 만들고, 혼선차를 경동시켜 MgO성분이 부화된 슬래그를 노벽 내화물에 코팅하는데, 그 특징이 있다.According to the present invention, a slag loaded with a MgO component is added to the upper surface of the slag remaining inside the mixed vehicle immediately after wiring the molten iron of the mixed vehicle to make a slag loaded with a MgO component. Coating, which is characterized.

일반적으로 혼선차의 슬래그는 CaO-SiO2-FeO-Al2O3계로 이루어진 화합물인데, 융점이 낮아 1300℃정도 이하이면 용융되어 점도가 낮은 상태를 이룬다. 이러한 슬래그에 MgO성분의 원료를 투입하면 MgO가 용융되어 MgO-Fe2O3계 화합물(마그네시오 페라이트:MgFe2O4)이 생성된다. 이 마그네시오 페라이트는 융점(1750℃)이 높아 열적으로 안정하며, 염기성 산화물에 속하기 때문에 화학적으로도 용선예비처리인 FeO, CaO, Na2CO3등에 강한 특성을 지니고 있다. 따라서, 이 마그네시오 페라이트가 내화물의 가동면에 노출된 알루미나 골재에 선택적으로 부착되어 내화물을 보호해 준다.In general, the slag of cross-talk difference is a compound composed of CaO-SiO 2 -FeO-Al 2 O 3 system, when the melting point is lower than about 1300 ℃ to achieve a state of low viscosity. When the input raw material for the MgO content in the slag is such that the molten MgO MgO-Fe 2 O 3 based compound: a (Magnesite Please ferrite MgFe 2 O 4) is generated. This magneto ferrite is thermally stable due to its high melting point (1750 ° C.), and belongs to basic oxides, and thus has strong chemical properties such as FeO, CaO, Na 2 CO 3, and the like. Therefore, this magneto ferrite is selectively attached to the alumina aggregate exposed on the movable surface of the refractory to protect the refractory.

이를 위해서는 먼저, 도 1에 도시된 바와 같이, 혼선차(10)에서 통상의 방법으로 예비처리된 용선을 배선한 직후 혼선차에 잔존하는 슬래그(1)에 마그네시아질 원료(2)를 투입하여야 한다. 이때, 잔류되는 슬래그(1)량은 조건에 따라 다르나, 개략적으로 용선 1톤당 약 30kg 정도이다.To this end, first, as shown in FIG. 1, the magnesia raw material 2 should be introduced into the slag 1 remaining in the crosstalk immediately after wiring the molten iron pretreated by the conventional method in the crosstalk vehicle 10. . At this time, the amount of slag (1) remaining depends on the conditions, but is approximately 30kg per ton of molten iron.

도 1에서 미설명부호 11은 "혼선차의 철피"를 나타내고, 12는 "노벽 내화물"을 나타내고, 그리고 13은 "혼선차 경동장치"를 나타낸다.In Fig. 1, reference numeral 11 denotes a "bark of a crossroad car", 12 represents a "furnace refractory wall", and 13 represents a "crossroad car tilt device."

그리고, 본 발명에 적합한 마그네시아질 원료는 마그네시오 페라이트의 코팅에 유용한 것이면 되며, 그 예로는 소결 해수마그네시아 크링커나 천연산 소결마그네시아 크링커등이 있다. 이외에도 자원재활용 측면에서 제철소 제강공정중 발생하는 마그네시아질 폐내화물의 마그네시아-카본 내화벽돌의 분쇄물 또는, RH에 침적관 보수에 사용되는 마그네시아질 스프레이재의 미부착물 등도 이용할 수 있다.In addition, the magnesia raw material suitable for the present invention may be useful for the coating of magnesio ferrite, and examples thereof include sintered seawater magnesia clinker and natural sintered magnesia clinker. In addition, from the aspect of recycling of resources, crushed magnesia-carbon refractory bricks of magnesia waste refractories generated during the steelmaking process in steelworks, or unattached materials of magnesia spray materials used for repairing the immersion pipe in RH can be used.

이와 같은 마그네시아질 원료의 입도는 미세할수록 용융성 및 코팅성 측면에서는 바람직하나, 분진발생, 용융성 등을 고려해서 1-3mm 크기의 입도가 바람직하다.The finer the particle size of the magnesia raw material, the more preferable in terms of meltability and coating property, but in consideration of dust generation, meltability, etc., a particle size of 1-3 mm is preferable.

상기와 같은 마그네시아질 원료를 혼선차 내부에 잔존슬래그에 투입하는데, 그 투입량은 잔존하는 슬래그량을 고려해야 하는데, 구체적으로 슬래그중량을 기준으로 2-5중량%가 바람직하다. 그 이유는 2중량% 미만에서는 코팅성이 없으며, 5.0중량%를 넘으면 슬래그의 온도를 저하시키거나 슬래그 발생량을 증가시켜 바람직하지 못하다.The above-mentioned magnesia raw material is introduced into the remaining slag in the mixed vehicle, and the amount of the magnesia material should be taken into account in the amount of the remaining slag, and specifically 2-5% by weight based on the weight of the slag. The reason is that there is no coating property at less than 2% by weight, and if it exceeds 5.0% by weight, the slag temperature is lowered or the amount of slag generated is not preferable.

상기와 같은 양으로 투입하여 용융시키는데, 이때의 용융은 특별한 방법이있는 것이 아니라, 마그네시아질 원료를 고온의 슬래그에 투입하고 일정시간 유지하면 된다. 바람직하게는 투입후 10분이상 보다 바람직하게는 10-20분 유지하는 것이다. 그 이유는 10분 미만 유지하면 마그네시아의 용출이 적어 MgO-Fe2O3계 화합물의 생성이 어려울 수 있으며, 너무 오랜시간 유지하면 노내 온도가 저하되어 코팅작업에 불리하다.In the above-mentioned amount, the molten metal is melted, and there is no special method for melting the molten magnesium raw material into the hot slag and maintained for a certain time. Preferably 10 minutes or more after the addition is more preferably maintained for 10-20 minutes. The reason for this is that less than 10 minutes of elution of magnesia may be difficult to produce the MgO-Fe 2 O 3 compounds, and if maintained for too long, the temperature inside the furnace is lowered, which is disadvantageous for coating work.

상기와 같이 마그네시아질 원료를 투입하고 적정시간 유지후 혼선차를 경동하여 도 2에 도시된 것처럼, 혼선차 노벽내화물의 가동면에 마그네시아질 원료가 용융된 슬래그 코팅층(3)을 형성한다. 이때의 경동은 특별한 방법이 없고, 단지 슬래그가 혼선차 노벽내화물에 적절히 코팅되도록 만 하면 된다.As shown in FIG. 2, after adding the magnesia raw material and maintaining the proper time, the slag coating layer 3 in which the magnesia raw material is melted is formed on the movable surface of the mixed vehicle furnace wall refractory. At this time, there is no special method, and only the slag needs to be properly coated on the crossroad furnace refractory.

이와 같이 본 발명에 따라 혼선차의 내화물 가동면에 MgO-Fe2O3계의 화합물인 마그네시오 페라이트를 코팅하면, 용선수선 또는 용선예비처리시 용선이나 슬래그로부터 내화물을 보호할 수 있는 것이다.As described above, by coating the MgO-Fe 2 O 3 compound Magnesio Ferrite on the refractory movable surface of the crosstalk vehicle according to the present invention, it is possible to protect the refractory from the molten iron or slag during the molten iron or molten iron preliminary treatment.

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

도 3과 도 4는 실험실적 모사실험을 한 후 내화벽돌을 채취하여 관찰하고 그 내화물의 잔존 상태를 모식도로 나타낸 것이다.3 and 4 show the residual state of the refractory brick after collecting and observing the refractory brick after the laboratory simulation.

먼저, 도 3은 알루미나-탄화규소-카본질 내화벽돌(20)의 가동면 표면에 마그네시아질 원료를 슬래그량에 대해 2.5% 투입한 슬래그의 코팅층(21)을 코팅시켜 침식실험한 결과를 모식적으로 나타낸 것이다. 이때, 도 3에 코팅된 슬래그는 마그네시오 페라이트였다.First, FIG. 3 schematically illustrates the results of erosion experiments by coating a coating layer 21 of slag into which a magnesia raw material is added 2.5% of the slag amount on the movable surface of the alumina-silicon carbide-carbon refractory brick 20. It is shown as. At this time, the slag coated in Figure 3 was the magneto ferrite.

그리고, 도 4는 알루미나-탄화규소-카본질 내화벽돌(20)의 가동면 표면에 마그네시아를 투입하지 않아 슬래그 코팅층이 형성되지 않은 것으로 침식실험을 하고 그 결과를 모식도로 나타낸 것이다.In addition, FIG. 4 shows that the slag coating layer is not formed because no magnesia is added to the movable surface of the alumina-silicon carbide-carbon refractory brick 20, and the results are shown schematically.

도 3 및 도 4에서 미설명부호 22는 내화물의 가동면이다.Reference numeral 22 in FIGS. 3 and 4 is a movable surface of the refractory.

도 3 및 도 4에서 알 수 있는 바와 같이, 마그네시오 페라이트의 코팅층(21)이 형성된 것(도 3)과 코팅되지 않은 것(도 4)에 대해 내화물의 침식율을 비교해 보면 코팅층이 형성되지 않은 경우 내화물의 침식이 2배이상 빨랐다.As can be seen in Figures 3 and 4, comparing the erosion rate of the refractory to the coating layer 21 of the magneto ferrite is formed (Fig. 3) and uncoated (Fig. 4) when the coating layer is not formed Refractories were more than twice as fast.

상술한 바와 같이, 본 발명에 의하면 조업시 발생되는 혼선차 슬래그를 개질하여 노벽내화물을 코팅함으로써 혼선차의 노벽내화물의 장수명화를 꾀할 수 있는 효과가 있다. 또한, 슬래그의 개질은 제강공정에서 발생하는 부산물을 이용할 수 도 있어 자원재활용하는 부수적인 효과도 있다.As described above, according to the present invention, the cross talk slag generated during the operation is modified to coat the furnace wall refractory, thereby achieving the long life of the road refractory car of the cross talk car. In addition, the reforming of the slag may use the by-products generated in the steelmaking process, there is a side effect of recycling the resources.

Claims (3)

용선를 예비처리하고 운반하는 혼선차의 알루미나-탄화규소-카본질 노벽내화물 보호 방법에 있어서, 상기 혼선차에서 예비처리된 용선을 배선한 후, 혼선차에 잔존하는 슬래그에 잔존 슬래그 중량을 기준으로 2-5중량%의 마그네시아질 원료를 투입하여 10-20분 동안 유지하여 용융시키고, 이어 혼선차를 경동하여 슬래그를 노벽내화물의 가동면에 코팅하는 것을 특징으로 하는 혼선차 노벽내화물 보호를 위한 슬래그 코팅방법A method for protecting alumina-silicon carbide-carbon furnace furnace refractory material of a crosstalk vehicle for pretreating and transporting molten iron, wherein after the molten iron pretreated in the crosstalk car is wired, Slag coating to protect the crossroad car furnace refractory car, characterized in that the slag is coated on the movable surface of the furnace wall refractory car by injecting -5% by weight of magnesia raw material, maintaining it for 10-20 minutes, and then melting the crosstalk car. Way 제1항에 있어서, 상기 마그네시아질 원료는 소결해수마그네시아 클링커, 천연산 소결마그네시아 클링커, 제강공정에 발생하는 폐내화물의 마그네시아-카본질 내화벽돌의 분쇄물 및 마그네시아질 스프레이재의 폐기물로 이루어진 그룹중에서 선택된 1종임을 특징으로 하는 혼선차 노벽내화물 보호를 위한 슬래그 코팅방법The method of claim 1, wherein the magnesia raw material is selected from the group consisting of sintered seawater magnesia clinker, natural sintered magnesia clinker, crushed magnesia-carbon refractory brick of waste refractory generated in the steelmaking process and waste of magnesia spray material Slag coating method for protection of cross-road car refractories 제1항 또는 제2항에 있어서, 상기 마그네시아질 원료의 입도는 1 - 3mm인 것을 특징으로 하는 혼선차 노벽내화물 보호를 위한 슬래그 코팅방법The slag coating method of claim 1 or 2, wherein the magnesia raw material has a particle size of 1-3 mm.
KR1019970069249A 1997-12-16 1997-12-16 Slag coating method for protection of torpedo ladle car linig refractories KR100349173B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100515601B1 (en) * 2000-12-22 2005-09-16 재단법인 포항산업과학연구원 Recycling Method of Residual Castables for Teeming Ladle
KR100515600B1 (en) * 2000-12-22 2005-09-16 재단법인 포항산업과학연구원 Recycling Method of Residual Castables for Teeming Ladle

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100601082B1 (en) * 1998-12-29 2006-09-27 재단법인 포항산업과학연구원 Magnesia-Graphite Spray Material and Manufacturing Method Thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100515601B1 (en) * 2000-12-22 2005-09-16 재단법인 포항산업과학연구원 Recycling Method of Residual Castables for Teeming Ladle
KR100515600B1 (en) * 2000-12-22 2005-09-16 재단법인 포항산업과학연구원 Recycling Method of Residual Castables for Teeming Ladle

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