KR20050006857A - a composition for ladle adiabatic keeping warm stuff - Google Patents

a composition for ladle adiabatic keeping warm stuff Download PDF

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Publication number
KR20050006857A
KR20050006857A KR1020030046829A KR20030046829A KR20050006857A KR 20050006857 A KR20050006857 A KR 20050006857A KR 1020030046829 A KR1020030046829 A KR 1020030046829A KR 20030046829 A KR20030046829 A KR 20030046829A KR 20050006857 A KR20050006857 A KR 20050006857A
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South Korea
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ladle
composition
heat reserving
molten steel
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KR1020030046829A
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Korean (ko)
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이수용
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호진산업(주)
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Priority to KR1020030046829A priority Critical patent/KR20050006857A/en
Publication of KR20050006857A publication Critical patent/KR20050006857A/en

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/02Linings

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

PURPOSE: To provide a composition for ladle heat reserving material having excellent adiabaticity that is injected into a ladle after secondary refining at steelmaking plant to maintain a constant temperature at all times by suppressing temperature drop of molten steel during transfer of ladle and from casting starting to casting finishing. CONSTITUTION: The composition for ladle adiabatic heat reserving material comprises 60 wt.% or less of SiO2, 40 wt.% or less of Al2O3 and 7 wt.% or less of fixed carbon, wherein the heat reserving material having the composition is injected into molten steel in a ladle to prevent generation of dust and obtain effects of oxidation prevention and heat reserving of the surface of molten steel, and wherein the heat reserving material has a specific gravity of 0.7 g/cc or less, a moisture content of 3% or less and a grain size of 3 to 15 m/m 90% or more. The composition for ladle adiabatic heat reserving material comprises 55 wt.% or less of SiO2, 35 wt.% or less of Al2O3, 5 wt.% or less of Fe2O3, 2 wt.% or less of MnO and 5 wt.% or less of fixed carbon, wherein the heat reserving material having the composition has high adiabaticity and good spreadability and generates less dust, and the heat reserving material is injected onto the surface of molten steel in ladle to suppress temperature drop of molten steel according to the passage of time, and wherein the heat reserving material has a specific gravity of 0.7 g/cc or less, a moisture content of 2% or less and a grain size of 3 to 15 m/m 90% or more.

Description

래들 단열 보온재의 조성물{a composition for ladle adiabatic keeping warm stuff}A composition for ladle adiabatic keeping warm stuff}

본 발명은 래들 단열 보온재에 관한 것으로서, 보다 상세하게는 제강공장 이차정련 처리 종료후 래들 내에 투입되어 용강의 온도강하를 방지할 수 있는 래들 단열 보온재의 조성물에 관한 것이다.The present invention relates to a ladle thermal insulation thermal insulation, and more particularly to a composition of the ladle thermal insulation thermal insulation that can be introduced into the ladle after the secondary refining treatment of the steel mill to prevent the temperature drop of the molten steel.

잘 알려진 바와 같이, 제강공정에서 전로출강 이후 래들(ladle)에 수강된 용강은 제품용도에 따라 2차 정련을 거쳐서 조괴 또는 연속 주조된다. 상기 전로출강 이후 주입완료까지는 용강 2차 정련을 할 경우 가스교반, 분말취입 및 탈가스처리와 주입작업을 포함하여 장시간이 소요되므로 출강 이후의 용강 온도관리는 조업안정과 품질향상을 위해 가장 기본적 요소가 되고 있다.As is well known, molten steel received in ladles after converter tapping in the steelmaking process is subjected to secondary refining or ingot casting in accordance with product usage. Since the molten steel secondary refining takes place for a long time, including gas stirring, powder injection, degassing, and injection operations, the molten steel temperature management after tapping is the most basic element for operation stability and quality improvement. It is becoming.

또한, 래들 용강 온도저하가 심하여서 전로출강 온도를 그만큼 더 높이게 되면 전로 내화물 수명이 크게 단축되고 출강시의 합금철 및 탈산제의 손실량이 증가하여 조업 불안정과 품질저하는 물론 합금철의 제조원가를 상승시켰다.In addition, if the temperature of the slab molten steel is severe and the converter tapping temperature is higher, the refractory life of the converter is greatly shortened and the loss of ferroalloy and deoxidizer during the tapping increases, resulting in unstable operation and deterioration of quality as well as the manufacturing cost of ferroalloy. .

이와 같은 이유로 전로출강으로부터 주입완료까지의 용강온도의 저하는 최소화하는 것이 바람직하며, 이를 위하여 래들 단열 보온재가 사용되어진다.For this reason, it is desirable to minimize the decrease in the molten steel temperature from the converter exit steel to the completion of injection, and for this purpose, a ladle insulation insulating material is used.

그러나, 종래의 래들 보온재는 일반적으로 널리 알려진 공급용 Al2O3와 SiO2및 점토 등의 물질로 조성되어 있기 때문에 상기 조성물들에 의존한 보온성 효과만을 기대할 수밖에 없고 또한 용강중에 부상 분리되어 표면층으로 떠오르는 개재물의 흡수능력이 떨어지는 단점이 있었다.However, since the conventional ladle thermal insulation material is generally composed of well-known materials such as Al 2 O 3 for supply, SiO 2 and clay, only the thermal insulation effect depending on the compositions can be expected, and it is also separated from the molten steel to the surface layer. There was a drawback of poor absorption of rising inclusions.

따라서, 상기한 바와 같은 문제점을 해결하기 위한 본 발명의 목적은 래들에 투입되어 용강의 온도강하를 방지할 수 있는 래들 단열 보온재의 조성물을 제공함에 있다.Accordingly, an object of the present invention for solving the problems as described above is to provide a composition of ladle insulation thermal insulation material that can be added to the ladle to prevent the temperature drop of the molten steel.

본 발명의 다른 목적은 용강의 온도를 항상 일정온도로 유지시킬 수 있는 래들 단열 보온재의 조성물을 제공함에 있다.Another object of the present invention is to provide a composition of ladle insulation insulation that can maintain the temperature of the molten steel at a constant temperature at all times.

상기한 바와 같은 목적을 달성하기 위한 본 발명은, SiO2≤55%, Al2O3≤35%, Fe2O3≤5%, MnO ≤2% 및 고정탄소 ≤5%로 이루어짐을 특징으로 한다.The present invention for achieving the above object, characterized in that consisting of SiO 2 ≤ 55%, Al 2 O 3 ≤ 35%, Fe 2 O 3 ≤ 5%, MnO ≤ 2% and fixed carbon ≤ 5% do.

이하 본 발명에 따른 바람직한 실시 예를 상세히 설명하면 다음과 같다.Hereinafter, a preferred embodiment according to the present invention will be described in detail.

후술될 상세한 설명에서는 상술한 기술적 과제를 이루기 위해 본 발명에 있어 한 개의 대표적인 실시 예를 제시할 것이다. 그리고 본 발명으로 제시될 수 있는 다른 실시 예들은 본 발명의 구성에서 설명으로 대체한다.DETAILED DESCRIPTION In the following detailed description, one representative embodiment of the present invention is set forth in order to achieve the above technical problem. And other embodiments that can be presented with the present invention are replaced by the description in the configuration of the present invention.

우선 본 발명에서 제안하고자 하는 래들 단열 보온재의 개념을 살펴보면, 제강공장 이차정련 처리 종료후 래들 내부에 투입되어 래들 이송시 및 주조 개시부터 말기까지의 온도강하를 억제하여 항상 일정온도를 유지할 수 있도록 단열성이 뛰어난 보온재의 조성물을 제안하고자 하는 것이다.First, the concept of the ladle insulation thermal insulation material to be proposed in the present invention, it is put into the ladle after the secondary refining process of the steelmaking plant to suppress the temperature drop from ladle transfer and start casting to the end of the insulation to maintain a constant temperature at all times It is to propose a composition of this excellent heat insulating material.

또한 본 발명에 있어서, 하기에서 후술될 각 실시 예에서 상한값(≤)은 설정하고 하한값를 설정하지 않은 이유는, 상기 상한값을 초과하지 않는 범위 내에서 각 조성물들을 배합하여 보온재를 제조하게 되면 본 발명에 따른 보온재의 효과를 달성할 수 있고, 만약 상기 상한값을 초과하게 되면 본 발명의 효과를 달성할 수 없기 때문이다.In addition, in the present invention, the reason why the upper limit (≤) is set in each of the embodiments to be described below, and the lower limit is not set, is to prepare the insulation by blending each composition within a range not exceeding the upper limit. This is because the effect of the insulating material can be achieved, and if the upper limit is exceeded, the effect of the present invention cannot be achieved.

따라서, 본 발명에서는 전술한 바와 같이 상한값을 설정하고 하한값을 설정하지 않은 것은 본 발명의 권리범위를 확장하려는 것이 아니라 본 발명에 따른 최상의 효과를 달성할 수 있도록 하기 위함이다.Therefore, in the present invention, as described above, the upper limit value and the lower limit value are not set to extend the scope of the present invention, but to achieve the best effect according to the present invention.

이하 본 발명의 바람직한 실시 예에 의거 상세히 설명하겠는 바, 상기 본 발명이 실시예에 의해 한정되는 것은 아니다.Hereinafter will be described in detail based on the preferred embodiment of the present invention, the present invention is not limited by the embodiment.

[실시예 1]Example 1

SiO2≤60%와 Al2O3≤40% 및 고정탄소(fixed carbon) ≤7%를 혼합한 다음, 이를 성형기에 투입하여 원형의 과립상태로 성형한 후, 이를 다시 통상의 열풍발생기와 건조기 및 냉각기를 이용하여 건조시키고 냉각시켜 본 발명의 래들 단열 보온재를 제조하였다.SiO 2 ≤60%, Al 2 O 3 ≤40% and fixed carbon ≤7% are mixed and then put into a molding machine to form a circular granular state, which is then again converted into a conventional hot air generator and a dryer. And dried using a cooler and cooled to prepare a ladle thermal insulation insulating material of the present invention.

한편, 전술한 바와 같은 조성물로 이루어진 보온재를 래들 내에 투입하게 되면 분진이 전혀 발생하지 않고 용탕표면의 산화방지 및 보온역할을 하며, 이러한 보온재의 물리적 성질은 표 1과 같다.On the other hand, when the insulating material made of the composition as described above is put into the ladle, no dust is generated at all to prevent oxidation and thermal insulation of the molten surface, the physical properties of these insulating materials are shown in Table 1.

부피비중Volume specific gravity 수분moisture 입 도Mouth dildo ≤0.7≤0.7 ≤3%≤3% 3~15m/m 90% 이상3 ~ 15m / m 90% or more

[실시예 2]Example 2

SiO2≤55%와 Al2O3≤35%, Fe2O3≤5% 및 MnO ≤2%, 그리고 고정탄소 ≤5%를 혼합한 다음, 이를 성형기에 투입하여 원형의 과립상태로 성형한 후, 이를 다시 통상의 열풍발생기와 건조기 및 냉각기를 이용하여 건조시키고 냉각시켜 본 발명의 래들 단열 보온재를 제조하였다.SiO 2 ≤55%, Al 2 O 3 ≤35%, Fe 2 O 3 ≤5% and MnO ≤2%, and fixed carbon ≤5% were mixed and then fed into a molding machine to form circular granules. Then, it was dried and cooled again using a conventional hot air generator, a dryer and a cooler to prepare a ladle insulation thermal insulation of the present invention.

이때, 상기한 바와 같은 화학성분으로 조성된 보온재는 고단열성으로서 양호한 퍼짐성 및 투입시 화염과 분진 발생이 적고 또한 출강된 래들 용강표면상에 투입되어 시간경과에 따른 용강의 온도강하 억제를 목적으로 사용된다.At this time, the thermal insulation material composed of the chemical components as described above has high thermal insulation properties, has good spreadability and little flame and dust generation at the time of injection, and is used for the purpose of suppressing the temperature drop of the molten steel over time as it is put on the surface of the molten steel. do.

한편, 이러한 특성을 가지는 본 발명의 래들 단열 보온재는 표 2와 같은 물리적 성질을 가지고 있다.On the other hand, ladle insulation thermal insulation of the present invention having such a property has the physical properties as shown in Table 2.

부피비중Volume specific gravity 수 분moisture 입 도Mouth dildo ≤0.7≤0.7 ≤2%≤2% 3~15m/m 90% 이상3 ~ 15m / m 90% or more

이상으로 살펴본 바와 같이, 본 발명은 고단열성을 유지하고 퍼짐성이 양호할 뿐만 아니라 래들 내에 보온재를 투입시 화염 및 분진발생이 거의 발생하지 않는 장점이 있다.As described above, the present invention has the advantage of maintaining high insulation and good spreadability as well as generating little flame and dust when the insulation is added to the ladle.

또한, 본 발명은 용강중의 가스나 제품에서 발생하는 가스가 용강중에 잔류 또는 침투되지 않고 용이하게 외부로 방출할 수 있도록 통기성이 뛰어난 이점이 있다.In addition, the present invention has an advantage of excellent breathability so that the gas generated in the molten steel or the product gas can be easily released to the outside without remaining or penetrated in the molten steel.

그리고, 상기 보온재의 입자는 강도가 높기 때문에 수송시 부서지지 않을 뿐만 아니라 벨트 컨베이어로 수송한 후 래들 내에 투입시 방산 현상이 없는 상승적인 효과가 있다.In addition, since the particles of the thermal insulation material have high strength, the particles of the thermal insulation material are not broken when transported, and have a synergistic effect without dissipation when they are introduced into the ladle after being transported to the belt conveyor.

Claims (2)

래들 단열 보온재의 조성물에 있어서,In the composition of the ladle insulation insulation, SiO2≤60%,SiO 2 ≤60%, Al2O3≤40%,Al 2 O 3 ≤40%, 고정탄소 ≤7%로 이루어짐을 특징으로 하는 래들 단열 보온재의 조성물.Ladle insulation insulation composition, characterized in that consisting of fixed carbon ≤7%. 래들 단열 보온재의 조성물에 있어서,In the composition of the ladle insulation insulation, SiO2≤55%,SiO 2 ≤55%, Al2O3≤35%,Al 2 O 3 ≤35%, Fe2O3≤5%, 및Fe 2 O 3 ≦ 5%, and MnO ≤2%, 그리고MnO ≤2%, and 고정탄소 ≤5%로 이루어짐을 특징으로 하는 래들 단열 보온재의 조성물.Ladle insulation thermal insulation composition, characterized in that consisting of fixed carbon ≤5%.
KR1020030046829A 2003-07-10 2003-07-10 a composition for ladle adiabatic keeping warm stuff KR20050006857A (en)

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