KR100770171B1 - Refractory composition for melter-gasifier of finex - Google Patents
Refractory composition for melter-gasifier of finex Download PDFInfo
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- 239000000203 mixture Substances 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 claims abstract description 18
- 239000012535 impurity Substances 0.000 claims abstract description 9
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 18
- 238000002844 melting Methods 0.000 claims description 17
- 230000008018 melting Effects 0.000 claims description 17
- 230000009970 fire resistant effect Effects 0.000 claims description 12
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 2
- 239000000155 melt Substances 0.000 claims description 2
- 238000002309 gasification Methods 0.000 claims 2
- 238000005260 corrosion Methods 0.000 abstract description 6
- 230000007797 corrosion Effects 0.000 abstract description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 2
- 229910052593 corundum Inorganic materials 0.000 abstract 2
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 abstract 1
- 229910052681 coesite Inorganic materials 0.000 abstract 1
- 229910052906 cristobalite Inorganic materials 0.000 abstract 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 abstract 1
- 239000000377 silicon dioxide Substances 0.000 abstract 1
- 235000012239 silicon dioxide Nutrition 0.000 abstract 1
- 229910052682 stishovite Inorganic materials 0.000 abstract 1
- 229910052905 tridymite Inorganic materials 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 29
- 229910052742 iron Inorganic materials 0.000 description 14
- 230000003628 erosive effect Effects 0.000 description 12
- 239000002893 slag Substances 0.000 description 9
- 238000005452 bending Methods 0.000 description 5
- 238000005299 abrasion Methods 0.000 description 4
- 239000003245 coal Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 229910000805 Pig iron Inorganic materials 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000010309 melting process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
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- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3206—Magnesium oxides or oxide-forming salts thereof
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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/327—Iron group oxides, their mixed metal oxides, or oxide-forming salts thereof
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Abstract
Description
본 발명은 내화 조성물에 관한 것으로, 더욱 상세하게는 FINEX 용융로에 사용되는 내화 조성물에 관한 것이다.The present invention relates to fire resistant compositions, and more particularly to fire resistant compositions used in FINEX melting furnaces.
고로법이라고 하는 통상의 제철법은 용융선철을 제조하기 위하여 고로에 장입하는 원료를 전처리 공정에서 코크스와 괴상의 철광석으로 가공한 다음 이와 같이 덩어리 상태의 원료를 이용하여 용융선철을 제조하여 왔다.In general, a steelmaking method called a blast furnace method has been processing molten pig iron by using a raw material in the form of agglomerate after processing the raw material charged into the blast furnace in the pretreatment process to produce molten pig iron.
그러나 이러한 전처리 공정이 필요한 기존의 고로법은 석탄의 코크스화 과정과 괴상의 철광석으로 소결하는 과정에서 많은 유해 가스를 배출하여 환경오염문제를 야기하고 있다.However, the existing blast furnace method requiring such a pretreatment process causes environmental pollution problems by emitting a lot of harmful gases during the coking process of coal and sintering into a massive iron ore.
따라서, 최근 들어 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 such environmental pollution problems and to prepare for resource depletion.
현재 개발되고 있는 용융환원 제철법 중 FINEX 공정은 미립의 석탄과 분체 형태의 철광석을 최초 채광한 상태에서 입도만 분리하여 그대로 사용함에 따라 고 로법에 비해 원료비가 저렴하여 상업화가 진행되고 있다. Currently, the FINEX process is being commercialized due to the low raw material cost compared to the blast furnace method, as the FINEX process separates the particle size from the first mined state of fine coal and powder iron ore.
FINEX 공정은 크게 분체 형태의 철광석(분광석)을 유동 환원로 내에서 환원시키는 유동환원공정과, 이와 같이 직접 환원된 분철광을 용융가스화로 내에서 용융시키는 용융공정으로 이루어져 있다. The FINEX 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.
직접 환원된 분철광을 용융시키는 용융공정에서는 철광석, 석탄, 및 산소가 사용되므로, 철광석, 코크스, 및 고온의 공기가 사용되는 고로와 상이하고, 조업 온도 또한 고로에 비하여 높기 때문에 용융로를 이루는 내화 조성물의 침식이 가속화되는 문제점이 있다. Iron ore, coal, and oxygen are used in the melting process of melting the directly reduced ferrous ore, and thus, the refractory composition of the melting furnace is different from that of iron ore, coke, and hot air, and the operating temperature is higher than that of the blast furnace. There is a problem that the erosion of the is accelerated.
이와 같은 내화 조성물의 침식은 용융로에 있어 공정의 안정성을 떨어뜨리므로 공정운용에 심각한 장애요인으로 작용하고 있다.Such erosion of the refractory composition lowers the stability of the process in the smelter, and thus acts as a serious obstacle to process operation.
본 발명은 상기와 같은 종래의 문제점을 해결하기 위하여 제안된 것으로서, 그 목적은 FINEX 용융로에 사용되는 내화 조성물로서 내침식성, 및 내마모성이 우수한 내화 조성물을 제공하는 것이다.The present invention has been proposed to solve the above conventional problems, and an object thereof is to provide a fire resistant composition having excellent corrosion resistance and wear resistance as a fire resistant composition used in a FINEX melting furnace.
상기 목적을 달성하기 위하여, 본 발명은 Al2O3, N2, 및 불가피한 불순물을 포함하며, 상기 Al2O3의 함유량은 80 내지 98 중량%이고, N2의 함유량은 1 내지 10 중량%이며, 상기 불가피한 불순물의 함유량은 1 내지 10 중량%인 것인 FINEX 용융로용 내화 조성물을 제공한다. In order to achieve the above object, the present invention contains Al 2 O 3 , N 2 , and inevitable impurities, the content of Al 2 O 3 is 80 to 98% by weight, the content of N 2 is 1 to 10% by weight The content of the unavoidable impurity is 1 to 10% by weight to provide a fire resistant composition for a FINEX melting furnace.
상기 내화 조성물은 FINEX 용융로의 영구장 보호용으로 더욱 바람직하게 사용될 수 있다. The refractory composition may be more preferably used for permanent field protection of the FINEX melting furnace.
상기 불가피한 불순물로는 CaO, MgO, Fe2O3, SiO2, C, 및 이들의 조합으로 이루어진 군에서 선택되는 것 등을 들 수 있다.Examples of the unavoidable impurity include CaO, MgO, Fe 2 O 3 , SiO 2 , C, and those selected from the group consisting of a combination thereof.
이하 본 발명을 더욱 상세히 설명한다. Hereinafter, the present invention will be described in more detail.
FINEX 공정 중 용융로에 사용되는 내화 조성물은 용융로 내부의 고온 용선 및 슬래그와 접촉시 손상되지 않도록, 우수한 내침식성 및 내마모성이 요구된다. 일반적으로 내화 조성물은 고온의 용선 및 슬래그와 접촉시 화학적으로 반응하고, 상기 화학적 반응에 의하여 내화 조성물이 침식되고, 소실되는 현상이 발생한다. 따라서, 고온의 용선과 슬래그가 존재하는 FINEX 용융로에 사용되는 내화 조성물의 경우 높은 내침식성을 가지는 것이 바람직하다. Refractory compositions used in melting furnaces during the FINEX process require good erosion and wear resistance so as not to be damaged upon contact with hot molten iron and slag in the furnace. In general, the refractory composition chemically reacts upon contact with hot molten iron and slag, and the chemical reaction causes erosion and disappearance of the refractory composition. Therefore, it is desirable to have a high erosion resistance in the case of the refractory composition used in the FINEX melting furnace in which hot molten iron and slag exist.
또한, 용융로 내부에서 고온의 용선 및 슬래그가 정체되어 있지 않고 유동하므로, 내화 조성물은 유동하는 고온의 용선 및 슬래그와 접촉시 기계적 마모가 발생하여 소실되는 경향이 있다. 이는 고온의 용선 및 슬래그와 내화 조성물이 화학적으로 반응하여 내화 조성물이 소실되는 화학적 침식과는 다르다. 따라서, 유동하는 고온의 용선 및 슬래그와 접촉하는 FINEX 용융로에 사용되는 내화 조성물은 기계적 마모 저항성도 가져야 한다. In addition, since hot molten iron and slag flow in the furnace without stagnation, the refractory composition tends to be lost due to mechanical wear occurring upon contact with the flowing hot molten iron and slag. This is different from chemical erosion, where hot molten iron and slag and the refractory composition are chemically reacted to lose the refractory composition. Therefore, the refractory composition used in the FINEX smelter in contact with flowing hot molten iron and slag must also have mechanical wear resistance.
따라서 본 발명은 상기 조건에 사용될 수 있는 내침식성 및 내마모성이 우수한 Al2O3-N2 내화 조성물을 선택하여 이들의 물리적 특성을 측정함으로써 최적의 내 침식성 및 내마모성을 나타내는 조성비를 아래와 같이 실험하였다. 또한, 상기 Al2O3-N2 내화 조성물은 FINEX 용융로의 영구장 보호용 내화 조성물로 더욱 바람직하게 사용될 수 있다. Therefore, the present invention is Al 2 O 3 -N 2 excellent in corrosion resistance and abrasion resistance that can be used in the above conditions By selecting the refractory compositions and measuring their physical properties, the composition ratio showing the optimum erosion resistance and abrasion resistance was tested as follows. In addition, the Al 2 O 3 -N 2 refractory composition may be more preferably used as a refractory composition for permanent field protection of the FINEX melting furnace.
하기한 실시예는 본 발명의 바람직한 일 실시예일 뿐 본 발명이 하기한 실시예에 의해 한정되는 것은 아니다.The following examples are only preferred embodiments of the present invention, and the present invention is not limited to the following examples.
(실시예 1)(Example 1)
서로 다른 함량의 N2를 함유하는 Al2O3-N2 내화 조성물을 1550℃에서 소성하여 제작하였다. 제작한 내화 조성물을, 1600℃로 유지되어 액체 상태인 FINEX 용융로의 용선 및 슬래그에 8시간 동안 침적시켰다. 상기 침적시킨 내화 조성물을 꺼내어 Al2O3-N2 내화 조성물의 부피를 측정함으로써 내 침식율을 측정하였다. 이러한 방법으로 측정된 각각의 시편들의 침식율을 아래의 표 1에 정리하였다.Al 2 O 3 -N 2 containing N 2 of different content The fire resistant composition was produced by baking at 1550 ° C. The produced refractory composition was kept at 1600 ° C. for 8 hours in the molten iron and slag of the FINEX melting furnace in a liquid state. Take out the deposited refractory composition and Al 2 O 3 -N 2 Erosion resistance was measured by measuring the volume of the refractory composition. The erosion rate of each specimen measured in this way is summarized in Table 1 below.
표 1은 N2 함량에 따른 Al2O3-N2 내화 조성물의 내침식성의 변화를 나타낸 것으로, 표 1에 나타난 것과 같이 N2 함량이 1 내지 10중량%인 경우, 높은 내침식성을 유지하는 것을 알 수 있다. 따라서, FINEX 용융로에 사용되는 내화 조성물로는 N2 함량이 1 내지 10중량%인 Al2O3-N2 내화재질을 사용하는 것이 바람직하다. Table 1 shows Al 2 O 3 -N 2 according to the N 2 content As a change in the erosion resistance of the refractory composition, as shown in Table 1, when the N 2 content is 1 to 10% by weight, it can be seen that high corrosion resistance is maintained. Therefore, as the refractory composition used in the FINEX melting furnace, Al 2 O 3 -N 2 having an N 2 content of 1 to 10% by weight. It is preferable to use a refractory material.
(실시예 2)(Example 2)
서로 다른 함량의 N2를 함유하는 Al2O3-N2 내화 조성물을 1550℃에서 소성하여 제작하였다. 제작한 Al2O3-N2 내화 조성물의 시편을 카본 도가니에 넣고 1400℃에서 30분 동안 유지한 후, 곡강도를 측정하였다. 일반적으로 높은 강도를 가지는 물질이 높은 내마모성을 가지므로, 고온의 환원분위기에서 곡강도를 측정하면 고온에서의 내마모성을 평가할 수 있다. 이러한 방법으로 측정한 각각의 시편들의 곡강도를 하기 표 2에 정리하였다.Al 2 O 3 -N 2 containing N 2 of different content The fire resistant composition was produced by baking at 1550 ° C. Created by Al 2 O 3 -N 2 Specimens of the fire resistant composition were placed in a carbon crucible and held at 1400 ° C. for 30 minutes, and then the bending strength was measured. In general, materials having high strength have high wear resistance, and thus, the wear resistance at high temperature can be evaluated by measuring the bending strength in a high temperature reducing atmosphere. The bending strength of each specimen measured in this way is summarized in Table 2 below.
표 2는 N2 함량에 따른 Al2O3-N2 내화 조성물의 곡강도 변화를 나타낸 것으로, 표 2에 나타난 것과 같이 N2 함량이 1 내지 10중량%인 경우, Al2O3-N2 내화 조성물이 높은 내마모성을 유지함을 알 수 있다. Table 2 shows Al 2 O 3 -N 2 according to the N 2 content As shown in Table 2, the bending strength of the refractory composition is changed. When the N 2 content is 1 to 10 wt%, as shown in Table 2, Al 2 O 3 -N 2 It can be seen that the fire resistant composition maintains high wear resistance.
또한, 상기 Al2O3-N2 내화 조성물을 FINEX 용융로의 영구장 보호용 내화 조성물로 사용할 경우, 내침식성 및 내마모성이 우수한 FINEX 용융로의 영구장 보호용 내화 조성물을 얻을 수 있음을 알 수 있다. In addition, the Al 2 O 3 -N 2 When the refractory composition is used as a fire protection composition for permanent field protection of a FINEX melting furnace, it can be seen that a fireproof composition for permanent field protection of a FINEX melting furnace having excellent corrosion resistance and abrasion resistance can be obtained.
본 발명에 따른 Al2O3-N2 내화 조성물은 각 성분의 함유량을 최적화 함으로써 FINEX 용선 및 슬래그에 대한 내침식성과 내마모성이 우수하여 용융로의 내화 조성물로서 사용하기에 적합하다. Al 2 O 3 -N 2 according to the present invention By optimizing the content of each component, the fire resistant composition is excellent in corrosion resistance and abrasion resistance to FINEX molten iron and slag, and is suitable for use as a fire resistant composition in a melting furnace.
본 발명의 단순한 변형 또는 변경은 모두 이 분야의 통상의 지식을 가진 자에 의하여 용이하게 실시될 수 있으며 이러한 변형이나 변경은 모두 본 발명의 영역에 포함되는 것으로 볼 수 있다.All simple modifications or changes of the present invention can be easily carried out by those skilled in the art, and all such modifications or changes can be seen to be included in the scope of the present invention.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5023212A (en) | 1988-03-11 | 1991-06-11 | Pechiney Electrometallurgie | Electrically melted multiphase material based on alumina and aluminium oxycarbide and oxynitride |
| JPH05221618A (en) * | 1992-02-12 | 1993-08-31 | Katsutoshi Yoneya | Production of aluminum nitride powder |
| KR20050031309A (en) * | 2003-09-29 | 2005-04-06 | 주식회사 포스코 | Refractory composition for using fluidized reduction furnace of finex |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5023212A (en) | 1988-03-11 | 1991-06-11 | Pechiney Electrometallurgie | Electrically melted multiphase material based on alumina and aluminium oxycarbide and oxynitride |
| JPH05221618A (en) * | 1992-02-12 | 1993-08-31 | Katsutoshi Yoneya | Production of aluminum nitride powder |
| KR20050031309A (en) * | 2003-09-29 | 2005-04-06 | 주식회사 포스코 | Refractory composition for using fluidized reduction furnace of finex |
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