KR100931219B1 - FEIEN Alkali Erosion Resistant Refractory Composition for Steelmaking Process - Google Patents
FEIEN Alkali Erosion Resistant Refractory Composition for Steelmaking Process Download PDFInfo
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Abstract
본 발명은 내화조성물에 관한 것으로서, Si3N4를 2내지 30중량%, SiC를 2내지 30중량%, Al2O3 를 96%내지 40중량%, 잔부는 CaO, MgO, Fe2O3, SiO2, C중 하나 이상의 조합의 불순물을 포함하는 FINEX 제철공정용 알칼리 침식 저항성 내화조성물을 특징으로 한다.The present invention relates to a refractory composition, 2 to 30% by weight of Si 3 N 4 , 2 to 30% by weight of SiC, 96 to 40% by weight of Al 2 O 3 , the remainder is CaO, MgO, Fe 2 O 3 An alkali erosion resistant refractory composition for a FINEX steelmaking process comprising impurities of at least one combination of Si, SiO 2 and C.
FINEX 제철공정용 내화물의 경우에, 공정과정 중에 알칼리에 의한 침식이 많이 일어나므로 내화물의 저항성이 강하여야 하는데, 본 발명의 내화 조성물을 사용할 경우, 알칼리에 대한 저항성이 우수하므로 FINEX 제철공정용 내화 조성물로써 우수한 효과가 발생한다. In the case of the FINEX steelmaking refractories, the resistance of the refractory should be strong because many erosions occur due to alkali during the process. If the fireproof composition of the present invention is used, the fireproof composition for the FINEX steelmaking process is excellent. As a result, excellent effects occur.
Description
본 발명은 내화조성물에 관한 것으로서, 더욱 상세하게는, Si3N4를 2내지 30중량%, SiC를 2내지 30중량%, Al2O3 를 96%내지 40중량%, 잔부는 CaO, MgO, Fe2O3, SiO2, C중 하나 이상의 조합의 불순물을 포함하는 것을 특징으로 하는 FINEX 제철공정용 알칼리 침식 저항성 내화조성물이다. FINEX 제철공정 중 발생하는 일산화탄소에는 알칼리 성분이 포함되는데, 알칼리에 의한 내화조성물이 침식되므로, 본 발명에 의한 내화조성물을 사용할 경우에는 알칼리에 대한 침식성을 저하시켜서 내화조성물의 박리현상을 줄일 수 있고, 박리된 내화물에 의한 조업효율의 저하를 막을 수 있다.The present invention relates to a fireproof composition, more specifically, 2 to 30% by weight of Si 3 N 4 , 2 to 30% by weight of SiC, 96% to 40% by weight of Al 2 O 3 , the remainder is CaO, MgO , Fe 2 O 3 , SiO 2 , C is an alkali erosion resistant refractory composition for the FINEX steelmaking process, characterized in that it contains impurities. Carbon monoxide generated during the FINEX steelmaking process contains an alkali component, and since the refractory composition by alkali is eroded, when using the refractory composition according to the present invention, it is possible to reduce the erosion resistance of the alkali composition by reducing the corrosion resistance of the refractory composition, The fall of operation efficiency by the peeled refractory can be prevented.
종래에는 통상의 제철법으로서, 용융선철을 제조하기 위하여 고로에 장입하는 원료를 전처리 공정에서 코크스와 괴상의 철광석으로 가공한 다음 이와 같이 덩 어리 상태의 원료를 이용하여 용융선철을 제조하여 왔다. 그러나 이러한 전처리 공정이 필요한 종래의 고로법은 석탄의 코크스화 과정과 괴상의 철광석으로 소결하는 과정에서 많은 유해 가스를 배출하여 환경오염문제를 야기하고 있다.Conventionally, as a general steelmaking method, molten pig iron has been manufactured using raw materials in the form of lumps after processing raw materials charged into the blast furnace to prepare molten pig iron in coke and bulk iron ore in a pretreatment step. However, the conventional blast furnace method that requires such a pretreatment process is causing a lot of harmful gases in the process of coking coal and sintering into a massive iron ore, causing environmental pollution.
따라서 최근들어 이러한 환경오염문제를 극복하면서 아울러 자원고갈에 대한 대비책으로 새로운 제철법인 용융환원법에 대하여 많은 관심과 연구가 집중되고 있다. Therefore, in recent years, much attention and research has been focused on the new steelmaking method, the molten reduction method, in order to overcome the environmental pollution problem and to prepare for resource depletion.
FINEX 제철공정은 값이 저렴한 가루형태의 철광석과 석탄을 가공없이 직접 사용하여 쇳물을 생산함으로써, 설비투지와 오염물질 배출을 대폭 줄일 수 있는 환경친화적인 제철공정이다. 따라서 종래의 고로 위에서 철광석과 코크스를 집어넣고 아래에서 고온의 바람을 불어넣어 쇳물을 녹여내던 고로법이나, 값이 비싼 원료를 사용해야 하는 코렉스 공법보다도 훨씬 효율적인 제선 공법이다. 또한, FINEX 제철공정은 코크스 공정이나 소결 공정과 같은 철광석과 원료탄의 예비처리 설비가 필요없어 투자비가 적게 들고, 공해물질이 발생하지 않는 혁신적인 신제철 공정이고, 풍부하고 값이 싼 지름 8m 이하의 철광석과 일반탄을 사용하기 때문에 코크스 및 소결 공정을 생략할 수 있어 코렉스 공법보다도 효율적인 공법이다.FINEX Steelmaking is an environmentally friendly steelmaking process that can reduce waste and pollutant emissions by producing wastewater by directly using inexpensive powdered iron ore and coal without processing. Therefore, iron ore and coke are put on top of a conventional blast furnace to blow hot water from the bottom of the blast furnace method or more expensive steelmaking method than the Korex method that requires the use of expensive raw materials. In addition, FINEX steelmaking process is an innovative new steelmaking process that requires less preliminary treatment of iron ore and raw coal such as coke process and sintering process. Coke and sintering process can be omitted because plain coal is used, which is more efficient than the Corex method.
뿐만 아니라 FINEX 제철공정은 환경 친화적 공법으로, 예비처리에서 발생하는 환경오염 물질인 황산화물(SOx), 질소산화물(NOx), 이산화탄소 배출량이 고로법보다 현저히 낮아지는데, 이는 FINEX 제철공정의 유통환원로가 탈황 작용을 하고 용융로에서 순산소를 사용하기 때문이다.In addition, the FINEX steelmaking process is an environmentally friendly process, and the emissions of sulfur oxides (SOx), nitrogen oxides (NOx), and carbon dioxide, which are environmental pollutants from pretreatment, are significantly lower than the blast furnace method. Desulfurization and use of pure oxygen in the furnace.
FINEX 제철공정은 크게 분체형태의 철광석(분광석)을 유동 환원로내에서 환 원시키는 유동환원공정과 이와 같이 직접환원된 분철광을 용융가스화로 내에서 용융시키는 용융공정으로 이루어져 있다. The FINEX steelmaking process consists of a flow reduction process for reducing iron ore (spectral ore) in powder form in a flow reduction furnace and a melting process for melting the directly reduced ferrite ore in a melt gasifier.
분광석의 환원공정은 유동 환원로 내에서 진행되며, 환원 가스로는 용융 가스화로에서 석탄의 연소에 의해 발생한 다량의 일산화탄소를 사용한다. 용융 가스화로에서 발생한 일산화탄소 가스는 석탄 및 알칼리를 일부 함유한다. 일산화 탄소 중에 함유된 알칼리는 내화물 표면에 흡착되어 내화물 가동면을 변질시키고 이는 내화물 박리의 주원인이 된다. The reduction process of the spectroscopy proceeds in a flow reduction furnace, and the reducing gas uses a large amount of carbon monoxide generated by the combustion of coal in a melt gasifier. Carbon monoxide gas from the melt gasifier contains some coal and alkali. Alkali contained in carbon monoxide adsorbs on the surface of the refractory to deteriorate the refractory movable surface, which is a major cause of refractory peeling.
박리된 내화물은 공정을 따라 유동하게 되고 내화물의 박리가 과도하게 발생하게 되면 그 양이 많아져 공정의 유로를 막아 FINEX 제철공정의 조업효율을 저하시키므로 FINEX 제철공정의 안정적인 운용에 심각한 장애요인으로 작용한다. Exfoliated refractory flows along the process, and if excessive refractory occurs, the amount increases and it blocks the flow path of the process, reducing the operating efficiency of the FINEX steelmaking process, which acts as a serious obstacle to the stable operation of the FINEX steelmaking process. do.
본 발명은 상기와 같은 문제점을 해결하기 위하여 안출된 것으로서, FINEX 제철공정 중에 용융가스화로에서 발생하는 일산화탄소가 포함하고 있는 알칼리에 의한 박리현상을 막기위해, 알칼리에 대한 저항성이 큰 Si3N4-SiC-Al2O3 내화조성물을 제공하는 것을 발명의 목적으로 한다. The present invention has been made to solve the above problems, Si 3 N 4 -having a high resistance to alkali in order to prevent the peeling phenomenon by the alkali containing carbon monoxide generated in the molten gasifier during the FINEX steelmaking process. It is an object of the invention to provide a SiC-Al 2 O 3 refractory composition.
본 발명은 내화 조성물에 관한 것으로서, Si3N4를 2내지 30중량%, SiC를 2내지 30중량%, Al2O3 를 96%내지 40중량%, 잔부는 CaO, MgO, Fe2O3, SiO2, C중 하나 이상의 조합의 불순물을 포함하는 것을 특징으로 하는 FINEX 제철공정용 알칼리 침식 저항성 내화조성물이다. The present invention relates to a fire-resistant composition, 2 to 30% by weight of Si 3 N 4 , 2 to 30% by weight of SiC, 96% to 40% by weight of Al 2 O 3 , the balance CaO, MgO, Fe 2 O 3 , SiO 2 , C is an alkali erosion resistant refractory composition for the FINEX steelmaking process, characterized in that it contains impurities.
본 발명에 따른 내화조성물은 Si3N4-SiC-Al2O3조성물로써, 각 성분의 함유량을 최적, 호적화하여 알칼리 저항성이 우수한 조성물을 제조할 수 있다. FINEX 제철공정용 내화물의 경우에, 공정과정 중에 알칼리에 의한 침식이 많이 일어나므로 내화물의 저항성이 강하여야 하는데, 본 발명의 내화 조성물을 사용할 경우, 알칼리에 대한 저항성이 우수하므로 FINEX 제철공정용 내화 조성물로써 우수한 효과가 발생한다.The fire resistant composition according to the present invention is a Si 3 N 4 -SiC-Al 2 O 3 composition, it is possible to prepare a composition excellent in alkali resistance by optimizing and contenting the content of each component. In the case of the FINEX steelmaking refractories, the resistance of the refractory should be strong because a lot of erosion by alkali occurs during the process, but if the fireproof composition of the present invention is used, the fireproof composition for the FINEX steelmaking process is excellent. As a result, excellent effects occur.
상기 목적을 달성하기 위해, 본 발명은 Si3N4를 2내지 30중량%, SiC를 2내지 30중량%, Al2O3 를 96내지 40중량%를 함유하고, 잔부는 CaO, MgO, Fe2O3, SiO2, C등의 기타 불가피한 불순물로 이루어진 것을 특징으로 하는 FINEX 제철공정용 알칼리 침식 저항성 내화조성물을 제공한다.In order to achieve the above object, the present invention contains 2 to 30% by weight of Si 3 N 4 , 2 to 30% by weight of SiC, 96 to 40% by weight of Al 2 O 3 , the remainder is CaO, MgO, Fe It provides an alkali erosion resistant refractory composition for a FINEX steelmaking process, which is composed of other unavoidable impurities such as 2 O 3 , SiO 2 , and C.
이하 본 발명을 상세히 설명한다. Hereinafter, the present invention will be described in detail.
FINEX 제철공정은 용융가스화로에서 발생된 환원용 가스인 일산화탄소가 철광석을 환원시켜 철을 만드는 공정이다. 그러나, 용융가스화로에서 발생된 일산환 탄소 가스(환원용 가스)에는 용융가스화로에서 발생한 분진과 알칼리 물질이 함유되어 있다. 이러한 알칼리 물질은 내화물의 표면에 흡착, 내화물의 박리현상을 유발하여 내화물을 손상시킬 뿐 아니라 박리된 내화물이 공정을 유동하다가 공정유로를 막히게 하는 문제점을 발생시키므로 FINEX 제철공정용 내화물은 알칼리 물질에 대한 내구성을 가져야 한다. FINEX steelmaking is a process in which carbon monoxide, a reducing gas generated from a melt gasifier, reduces iron ore to produce iron. However, the monocyclic carbon gas (reduction gas) generated in the melt gasifier contains dust and alkaline substances generated in the melt gasifier. These alkalis not only damage the refractory by adsorbing on the surface of the refractory and peeling of the refractory, but also cause the problem that the peeled refractory blocks the process flow while clogging the flow path. It must be durable.
질화규소(Si3N4)는 상온과 고온에서 강도, 파괴인성, 열충격 저항성, 내산화성이 우수하고, 탄화규소(SiC)는 고온강도가 높고, 내마모성, 내산화성, 내식성, 크립저항성 등의 특성이 우수하여 고온 구조재료로 장점이 있으며, 산화알루미나(Al2O3)는 높은 내열성과 내화학성, 내식성, 고강도의 특성이 있다.Silicon nitride (Si 3 N 4 ) has excellent strength, fracture toughness, thermal shock resistance, and oxidation resistance at room temperature and high temperature, and silicon carbide (SiC) has high temperature strength, and has characteristics such as abrasion resistance, oxidation resistance, corrosion resistance, and creep resistance. It has excellent advantages as a high temperature structural material, and alumina oxide (Al 2 O 3 ) has high heat resistance, chemical resistance, corrosion resistance and high strength.
따라서 본 발명은 이러한 조건에 사용될 수 있는 알칼리 침식 저항성이 우수한 Si3N4-SiC-Al2O3 내화물을 선택하여 이들의 물리적 특성을 측정함으로써 최적의 알칼리 침식 저항성을 나타내는 조성비를 아래와 같이 실험하였다. Therefore, in the present invention, by selecting the Si 3 N 4 -SiC-Al 2 O 3 refractory having excellent alkali erosion resistance that can be used in these conditions and measuring their physical properties, the composition ratio showing the optimal alkali erosion resistance was tested as follows. .
먼저, SiC 분체에 의한 Si3N4-SiC-Al2O3 내화물의 알칼리 침식특성에 대하여 설명한다. First, the alkali erosion characteristics of Si 3 N 4 -SiC-Al 2 O 3 refractory by SiC powder will be described.
이를 위하여 서로 다른 함량의 Si3N4와 SiC를 함유한 Si3N4-SiC-Al2O3 내화물 시편들을 1550℃에서 소성하여 제작한 후 제조된 각각의 시편을 1550℃로 유지되어 액체 상태인 FINEX 슬래그 및 알칼리 혼합물에 3시간 침적한 후 꺼내어 Si3N4-SiC-Al2O3 내화물 시편들의 잔존을 측정함으로써 내침식성을 평가하였다. 이러한 방법으로 측정된 각각의 시편들의 내 침식성을 아래의 표 1에 정리하였다 To this end, Si 3 N 4 -SiC-Al 2 O 3 refractory specimens containing different amounts of Si 3 N 4 and SiC were calcined at 1550 ° C., and then each prepared specimen was maintained at 1550 ° C. in a liquid state. Erosion resistance was evaluated by immersion in phosphorus FINEX slag and alkali mixture for 3 hours and then taken out and measuring the remaining of Si 3 N 4 -SiC-Al 2 O 3 refractory specimens. The erosion resistance of each specimen measured in this way is summarized in Table 1 below.
표 1Table 1
표 1에 나타나 있는 바와 같이 Si3N4를 2내지 30중량%, SiC를 2내지 30중량%, Al2O3 를 96내지 40중량%를 함유할 경우 알칼리에 대한 침식저항성이 향상된 다는 것을 알 수 있다.As shown in Table 1, it is found that the erosion resistance to alkali is improved when 2 to 30 wt% of Si 3 N 4 , 2 to 30 wt% of SiC, and 96 to 40 wt% of Al 2 O 3 are improved. Can be.
이상의 실험결과에서 알 수 있듯이 FINEX 제철공정용 알칼리 저항성 내화물은 Si3N4를 2내지 30중량%, SiC를 2내지 30중량%, Al2O3를 96내지 40중량%를 함유한 것이 바람직하다는 것을 알 수 있다. As can be seen from the above experiment, it is preferable that the alkali resistant refractory material for the FINEX steelmaking process contains 2 to 30% by weight of Si 3 N 4 , 2 to 30% by weight of SiC, and 96 to 40% by weight of Al 2 O 3 . It can be seen that.
상기에서는 본 발명의 바람직한 실시예에 대하여 설명하였지만, 본 발명은 이에 한정되는 것이 아니고 특허청구범위와 발명의 상세한 설명 범위안에서 여러가지로 변형하여 실시하는 것이 가능하며, 이 또한 본 발명의 범위에 속하는 것은 당연하다.Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention, which are naturally within the scope of the present invention. Do.
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| KR19980038995U (en) * | 1996-12-20 | 1998-09-15 | 김종진 | Blower refractory for converter |
| KR20010069014A (en) * | 2000-01-11 | 2001-07-23 | 한종웅 | refractory material and method for fabricating the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR19980038995U (en) * | 1996-12-20 | 1998-09-15 | 김종진 | Blower refractory for converter |
| KR20010069014A (en) * | 2000-01-11 | 2001-07-23 | 한종웅 | refractory material and method for fabricating the same |
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