KR100461737B1 - Ramming refractories for molten trough cover of blast furnace - Google Patents
Ramming refractories for molten trough cover of blast furnace Download PDFInfo
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- KR100461737B1 KR100461737B1 KR10-1999-0033162A KR19990033162A KR100461737B1 KR 100461737 B1 KR100461737 B1 KR 100461737B1 KR 19990033162 A KR19990033162 A KR 19990033162A KR 100461737 B1 KR100461737 B1 KR 100461737B1
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- C—CHEMISTRY; METALLURGY
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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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- C—CHEMISTRY; METALLURGY
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B35/101—Refractories from grain sized mixtures
- C04B35/103—Refractories from grain sized mixtures containing non-oxide refractory materials, e.g. carbon
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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
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/52—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite
- C04B35/522—Graphite
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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
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/56—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides
- C04B35/565—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides based on silicon carbide
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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
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/62204—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products using waste materials or refuse
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/12—Opening or sealing the tap holes
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Abstract
본 발명은 고로 출선통 커버용 래밍내화물에 관한 것으로, 본 발명에 따른 고로 출선통 커버용 래밍내화물은, 알루미나가 60 중량% 이상 포함된 알루미나-탄화규소-흑연질 폐내화물의 입도가 5mm보다 크고 10mm보다 작거나 같은 것을 10-15 중량%, 3mm 보다 크고 5mm보다 작거나 같은 것을 20-30 중량%, 1mm 보다 크고 3mm보다 작거나 같은 것을 20-25 중량%, 1mm보다 작거나 같은 것을 15-20 중량%, 미분의 탄화규소를 12-15 중량%, 미분의 흑연을 3-8 중량%, 외삽된 페놀수지를 미량 사용하여 제조된 구성이며, 폐내화물을 파쇄한 후 파쇄한 전량을 표면처리 없이 바로 골재로 사용함으로써 폐내화물을 재활용처리하고 파쇄한 폐내화물을 4등급을 입도조정하여 일정 범위의 사용량으로 혼합함으로써 용선 및 슬래그에 대한 내침식성이 우수한 고로 출선통 커버용 래밍내화물을 제공한다.The present invention relates to a ramming refractories for blast furnace line cover, the ramming refractories for blast furnace line cover according to the present invention, the particle size of the alumina-silicon carbide-graphite waste refractories containing more than 60% by weight of alumina is larger than 5mm 10-15% by weight less than or equal to 10mm, 20-30% by weight greater than or equal to 3mm, 20-30% by weight greater than or equal to 1mm, 20-25% by weight less than or equal to 3mm, 15- less than 1mm 20% by weight, 12-15% by weight of finely divided silicon carbide, 3-8% by weight of finely divided graphite, and a small amount of extrapolated phenolic resin. Recycled waste refractory material by using it as aggregate without waste, and crushed waste refractory material by adjusting the particle size of 4 grades and mixing it to a certain range of usage. to provide.
Description
본 발명은 고로 출선통 커버용 래밍내화물에 관한 것으로, 더욱 상세하게는 용선 및 슬래그에 대한 내침식성이 우수한 알루미나-탄화규소-흑연(Al2O3-SiC-C)질 폐내화물을 이용한 고로 출선통 커버용 래밍내화물에 관한 것이다.The present invention relates to a ramming refractories for blast furnace tap cover, and more particularly to blast furnaces using alumina-silicon carbide-graphite (Al 2 O 3 -SiC-C) vaginal waste refractories having excellent corrosion resistance to molten iron and slag. It relates to ramming refractories for barrel covers.
일반적으로 고로 출선통에는 출선시 용선 온도의 저하 및 용선과 슬래그에 의한 비산을 방지하기 위해 커버를 사용하고 있으며, 출선통 커버는 샤모트질 또는 저급질 알루미나 캐스타블 내장내화물로 축조되어 있다. 이 때 출선통의 용탕면에서 커버까지의 거리가 가깝기 때문에 커버는 용탕면으로부터 열을 많이 받아 손상되기 쉽고, 출선시 용선과 슬래그가 비산하면서 내장내화물과 반응하여 반용융상태로 흘러내려 커버가 손상되기 쉽다. 또한 출선 말기의 공취 및 출선통 개공시의 산소 취입에 의하여 빠른 속도로 튕겨져 나오는 용선 및 슬래그가 커버를 가격하므로 손상이 더욱 심해진다.In general, a blast furnace drawer uses a cover to prevent a drop in molten iron temperature and scattering by molten iron and slag. The drawer cover is constructed of chamotte or low-grade alumina castable internal refractories. At this time, since the distance from the molten metal surface to the cover is close, the cover is easily damaged due to the heat from the molten surface, and when the molten iron and slag are scattered, it reacts with the internal refractories and flows down to the semi-melt state to damage the cover. Easy to be In addition, since the molten iron and slag bounced off at a high speed due to the air blowing at the end of the tapping line and the opening of the tap opening, the damage is more severe.
이와 같은 커버의 손상을 방지하기 위한 종래의 기술들 중에서 대표적인 것으로는 일본에서 제안된 특허공개공보 평9-278548호 및 특허공개공보 평6-345548호가 있다.Representative examples of the conventional techniques for preventing such damage of the cover are Japanese Patent Application Laid-open No. Hei 9-278548 and Japanese Patent Application Laid-open No. Hei 6-345548.
일본 특허공개공보 평9-278548호에서는 고로에서 사용한 후의 카본 함유 내화물을 파쇄하여 얻어진 1-5 mm의 입자를 가열산화처리하고 표면처리하여 건닝(gunning) 보수재로 사용한다. 일본 특허공개공보 평6-345548호는 폐내화물 조립을 내화원료와 배합하기 전에 미리 몰탈 및 물과 혼련하는 것을 특징으로 하는 유입재 제조방법에 관한 것이다.In Japanese Patent Application Laid-Open No. 9-278548, 1-5 mm particles obtained by crushing carbon-containing refractory material after use in a blast furnace are subjected to heat oxidation treatment and surface treatment to be used as a gunning repair material. Japanese Patent Application Laid-open No. Hei 6-345548 relates to a method for producing an influent, characterized in that the waste refractory assembly is kneaded with mortar and water before blending with a refractory raw material.
그러나 이러한 종래 기술들은 모두 폐내화물을 파쇄하고 표면처리한 후 그 일부인 조립만을 선택하여 건닝재와 유입재에 이용하는 것으로서, 대량 발생하는 폐내화물의 근본적인 처리방법은 되지 못한다.However, all of these prior arts are used for the drying material and the inflow material by crushing and refining waste refractories, and then selecting only a part of the assemblage, which is not a fundamental treatment method for the large amount of waste refractories.
본 발명은 상기한 바와 같은 문제점을 해결하기 위해 안출된 것으로, 그 목적은 폐내화물을 파쇄한 후 파쇄한 전량을 표면처리 하지 않고 골재로 사용하여 용선 및 슬래그에 대해 내침식성이 우수한 고로 출선통 커버용 래밍내화물을 제공하는 데 있다.The present invention has been made in order to solve the problems described above, the purpose is to cover the blast furnace blast furnace excellent in corrosion resistance against molten iron and slag by using aggregate as the aggregate without surface treatment after crushing waste refractories To provide a ramming refractory for the.
상기한 바와 같은 목적을 달성하기 위하여, 본 발명에 따른 고로 출선통 커버용 래밍내화물은, 알루미나가 60 중량% 이상 포함된 알루미나-탄화규소-흑연질 폐내화물의 입도가 5mm 보다 크고 10mm보다 작거나 같은 것을 10-15 중량%, 3mm 보다 크고 5mm보다 작거나 같은 것을 20-30 중량%, 1mm 보다 크고 3mm보다 작거나 같은 것을 20-25 중량%, 1mm보다 작거나 같은 것을 15-20 중량%, 미분의 탄화규소를 12-15 중량%, 미분의 흑연을 3-8 중량%, 외삽된 페놀수지를 미량 사용하여 제조된 것이다.In order to achieve the object as described above, the ramming refractories for blast furnace starter cover according to the present invention, the alumina-silicon carbide-graphite waste refractories containing more than 60% by weight of alumina particle size is greater than 5mm and less than 10mm 10-15% by weight, 20-30% by weight greater than or equal to 3mm, 20-30% by weight greater than or equal to 1mm, 20-25% by weight greater than or equal to 1mm, 15-20% by weight less than or equal to 1mm, 12-15% by weight of finely divided silicon carbide, 3-8% by weight of finely divided graphite, and a small amount of extrapolated phenol resin.
이하, 본 발명에 따른 고로 출선통 커버용 래밍내화물에 대해 상세히 설명한다.Hereinafter, the ramming refractory for blast furnace starter cover according to the present invention will be described in detail.
본 발명에서 사용한 알루미나-탄화규소-흑연질 내화물에는 혼선차용 내장벽돌이 있다. 혼선차용 내장벽돌은, 내침식성은 우수하나 내스폴링(spalling)성이 나쁜 알루미나의 특성을 흑연으로 보완하고 또한 탄화규소의 첨가에 의해 흑연이 산화되는 것을 방지하도록 제조된 내화물이다. 이 때 원료 중에서 알루미나의 함량이 높을수록 내침식성이 우수해지는데, 일반적으로 혼선차용 내장벽돌은 알루미나 성분을 60 중량% 이상 함유하고 있으며 페놀수지를 결합제로 하여 불소성으로 제조하고 있다.The alumina-silicon carbide-graphite refractory used in the present invention includes a built-in brick for crossroad cars. The built-in brick for crossroad cars is a refractory manufactured to supplement the characteristics of alumina having excellent corrosion resistance but poor spalling resistance with graphite and to prevent the oxidation of graphite by the addition of silicon carbide. At this time, the higher the content of alumina in the raw material, the better the erosion resistance. Generally, a mixed-car interior brick contains at least 60% by weight of alumina component and is manufactured with phenolic resin as a binder.
따라서 본 발명에서는 혼선차용 내장벽돌로 사용하고 난 후의 폐내화물이 용선 및 슬래그에 대한 내침식성이 우수하다는 점에 착안하여 이를 재활용한다. 재활용을 위해 혼선차용 내장벽돌의 표면에 부착된 이물질을 제거한 후, 파쇄하여 입도를 4등급 즉, 5mm 보다 크고 10mm보다 작거나 같은 것(극대립), 3mm 보다 크고 5mm보다 작거나 같은 것(대립), 1mm 보다 크고 3mm보다 작거나 같은 것(조립), 1mm보다 작거나 같은 것(세립)으로 분류하여 사용한다.Therefore, the present invention recycles the waste refractories after use as a built-in brick for the crossroad car is excellent in corrosion resistance to molten iron and slag. Remove the foreign matter adhering to the surface of the cross-brick car for recycling, and then crush it to make the particle size grade 4, that is, greater than 5mm and less than or equal to 10mm (maximum opposition), greater than 3mm and less than or equal to 5mm (opposition) ), Classified as larger than 1mm and less than or equal to 3mm (assembly), smaller than or equal to 1mm (fine grain).
일반적으로 부정형 내화물에서 내침식성을 포함한 물성의 최적치는 크기가 다른 여러 등급의 입도를 가진 내화물을 혼합하여 최밀충진구조가 되었을 때 얻어진다. 이에 따라 본 발명에서는 래밍시공 후의 내화물 조직을 최밀충진구조로 하기 위하여 알루미나-탄화규소-흑연질의 폐내화물을 파쇄한 후 이를 체갈림하여, 각각의 입도에 따른 원료 사용량을 5mm 보다 크고 10mm보다 작거나 같은 범위에서는 10-15 중량%, 3mm 보다 크고 5mm보다 작거나 같은 범위에서는 20-30 중량%, 1mm 보다 크고 3mm보다 작거나 같은 범위에서는 20-25 중량%, 1 mm보다 작거나 같은 범위에서는 15-20 중량%으로 하였다. 각 입도별로 상기한 사용량의 범위를 벗어난 경우에는 최밀충진구조로 시공되지 않아 기공율이 크고 강도가 저하되어서 용선 및 슬래그의 침입으로 인한 침식이 심하였다.In general, the optimal value of physical properties including corrosion resistance in amorphous refractory materials is obtained when the refractory structure is mixed with particles of various grades of different sizes. Accordingly, in the present invention, the alumina-silicon carbide-graphite waste refractories are crushed in order to make the refractory structure after the ramming construction the closest filling structure, and then the sieves are shredded, and the amount of raw materials used for each particle size is larger than 5 mm and smaller than 10 mm. 10-15 weight percent in the same range, 20-30 weight percent in the range greater than 3 mm and less than or equal to 5 mm, 20-25 weight percent in the range greater than 1 mm and less than or equal to 3 mm, 15 in the range less than or equal to 1 mm It was made into -20 weight%. If the particle size is out of the above-mentioned range of use, it is not constructed with the closest packing structure, so that the porosity is large and the strength is lowered, so that erosion due to intrusion of molten iron and slag is severe.
상기한 바와 같이 알루미나-탄화규소-흑연질의 폐내화물 입자를 입도별 사용량의 범위 내에서 혼합한 후, 여기에 입도 0.074 mm의 탄화규소를 12-15 중량%, 입도 0.074 mm의 흑연을 3-8 중량%, 페놀수지(외삽)를 12 중량% 혼합한다. 이와 같이 알루미나-탄화규소-흑연질의 폐내화물 입자와 혼합하는 첨가원료인 탄화규소, 흑연 및 페놀수지에 대해 설명하면 다음과 같다.As described above, after mixing the alumina-silicon carbide-graphite waste refractory particles within the range of particle size used, 12-15% by weight of silicon carbide having a particle size of 0.074 mm and graphite having a particle size of 0.074 mm were 3-8. 12% by weight of phenol resin (extrapolated) is mixed. As described above, silicon carbide, graphite, and phenol resins, which are additive materials mixed with alumina-silicon carbide-graphite waste refractory particles, will be described.
먼저, 탄화규소는 알루미나-탄화규소-흑연질의 폐내화물 내에 최소한 10 중량% 이상 함유되어 있으나 사용 중에 산화되어버려 그 양이 부족하므로 보충해주어야 하기 때문에 별로도 혼합하는 것이다. 탄화규소는 슬래그에 대한 내침식성이 우수하며, 특히 미분일 때 그 효과가 우수하다. 본 발명에서는 입도 0.074 mm의 탄화규소를 12-15 중량% 사용하는데, 사용량이 12 중량% 미만일 경우에는 슬래그에 대한 내침식성의 향상효과가 적고, 15 중량%를 초과하면 점력이 없는 탄화규소가 너무 많아서 시공성이 불량하고 미반응의 탄화규소가 쉽게 산화되어버리므로 오히려 내침식성이 저하된다. 따라서, 탄화규소의 적당한 사용량은 12-15 중량%이다.First, silicon carbide is contained in at least 10% by weight or more in the alumina-silicon carbide-graphite waste refractories, but since it is oxidized during use and lacks in amount, it is mixed separately. Silicon carbide has excellent corrosion resistance to slag, especially when fine powder. In the present invention, 12-15% by weight of silicon carbide having a particle size of 0.074 mm is used, but when the amount is less than 12% by weight, the effect of improving corrosion resistance against slag is less, and when the content exceeds 15% by weight, silicon carbide without viscosity is too large. Because of the poor workability and unreacted silicon carbide is easily oxidized, the corrosion resistance is rather deteriorated. Therefore, a suitable amount of silicon carbide is 12-15% by weight.
다음으로, 흑연 역시 알루미나-탄화규소-흑연질의 폐내화물 내에 함유되어 있으나 탄화규소와 마찬가지로 사용 중에 쉽게 산화되어 소실되어버리므로 보충해주어야 하기 때문에 첨가하는 것이다. 흑연은 불순물이 적고 비교적 순도가 높은인상흑연을 사용하고, 흑연은 슬래그에 대한 젖음방지효과가 뛰어나므로 침윤방지의 역할을 한다. 본 발명에서는 입도 0.074 mm의 흑연을 3-8 중량% 사용하는데, 사용량이 3 중량% 미만일 경우에는 슬래그에 대한 침윤방지의 향상효과가 적고, 8 중량%를 초과하면 사용량이 과다하여 혼련이 잘 되지 않고 분리된 흑연이 쉽게 산화되어버리므로 내침식성이 저하된다. 따라서, 흑연의 적당한 사용량은 3-8 중량%이다.Next, graphite is also contained in the alumina-silicon carbide-graphite waste refractories, but like silicon carbide, it is easily oxidized and disappears during use, so it is added. Graphite uses a relatively high purity of graphite, which is less impurity, and graphite is excellent in preventing wetting against slag, thus acting as an infiltration prevention. In the present invention, 3-8% by weight of graphite having a particle size of 0.074 mm is used. When the amount is less than 3% by weight, the effect of improving infiltration prevention against slag is less. Since the separated graphite is easily oxidized, the corrosion resistance is lowered. Therefore, a suitable amount of graphite is 3-8% by weight.
마지막으로, 페놀수지는 결합제의 역할을 하며, 사용량은 외삽으로 전체원료 100에 대해 12 중량% 정도면 적당하다.Finally, the phenol resin acts as a binder, and the amount of the phenol resin is extrapolated to 12 wt% based on 100 of the total raw materials.
이하, 본 발명의 실시예에 따른 고로 출선통 커버용 래밍내화물에 대해 설명한다.Hereinafter, a ramming refractory for a blast furnace tap cover according to an embodiment of the present invention.
표 1은 본 발명의 실시예 1-4 및 비교예 1-12의 조성을 종래예의 조성과 함께 나타낸 것이다.Table 1 shows the compositions of Examples 1-4 and Comparative Examples 1-12 of the present invention together with the compositions of the prior art.
본 발명의 실시예 1-4에 따른 고로 출선통 커버용 래밍내화물을 제조하기 위해 표 1에 나타난 조성으로 각각의 원료를 평량하여 혼련기의 바닥이 가열되는 웨트 팬 믹서(wet pan mixer)에서 80℃ 정도로 가온하면서 혼련하였다. 이 때 결합제로 사용된 페놀수지가 용융하여 원료 입자 표면에 코팅된다. 다음, 40×40×160 mm의 크기로 시편을 성형하여 공기 중에서 24시간 자연건조시킨 후, 건조기에서 110℃로 24시간동안 건조시켰다. 건조된 시편을 전기로에서 1000℃ 및 1450℃에서 각각 3시간 동안 유지하여 소성한 후 곡강도를 측정하고 이를 냉간강도로 하였다. 열간강도는 열간강도시험기를 이용하여 1000℃에서 30분 동안 유지한 후 열간상태에서의 강도를 측정하였다. 내침식성시험을 위해 소형 고주파유도 용해로를 이용하여 1550℃에서 1시간 동안 유지한 후 용선과 슬래그를 부어내고 시편의 침윤층 깊이와 침식깊이를 측정하였다.80 in a wet pan mixer in which the bottom of the kneader is heated by weighing each raw material with the composition shown in Table 1 to prepare a ramming refractories for blast furnace starter covers according to Examples 1-4 of the present invention. It knead | mixed while warming about degreeC. At this time, the phenol resin used as the binder is melted and coated on the surface of the raw material particles. Next, the specimen was molded into a size of 40 × 40 × 160 mm, naturally dried in air for 24 hours, and then dried at 110 ° C. for 24 hours in a dryer. The dried specimens were calcined by holding the dried specimens at 1000 ° C. and 1450 ° C. for 3 hours, respectively, and measured for bending strength. The hot strength was maintained at 1000 ° C. for 30 minutes using a hot strength tester, and then the strength in the hot state was measured. For a erosion resistance test, using a small high-frequency induction melting furnace for 1 hour at 1550 ℃, molten iron and slag was poured and the depth of erosion layer and erosion depth of the specimen was measured.
표 2는 본 발명의 실시예 1-4 및 비교예 1-12에 대한 시공성, 침식성, 열간강도 및 냉간강도 측정결과를 종래예의 측정결과와 함께 나타낸 것이다.Table 2 shows the results of the workability, erosion, hot strength and cold strength measurement of Example 1-4 and Comparative Example 1-12 of the present invention with the results of the conventional example.
표 2에 나타난 바와 같이, 본 발명의 실시예 1-4는 비교예 1-12 및 종래예에 비해 시공성 및 내침식성이 우수하고, 열간강도와 냉간강도가 더 컸다.As shown in Table 2, Example 1-4 of the present invention was superior in workability and erosion resistance, and had greater hot and cold strength than Comparative Examples 1-12 and the prior art.
이에 반해 비교예 1-12의 실험조건 및 그 결과를 살펴보면 다음과 같다. 폐내화물의 입도 5mm 보다 크고 10mm보다 작거나 같은 것의 사용량이 본 발명의 범위를 벗어난 비교예 1 및 2의 경우, 그 중 비교예 1에서는 침식을 억제하는 입도 5mm 보다 크고 10mm보다 작거나 같은 것의 사용량이 부족하여 침식이 심하였고, 5mm 보다 크고 10mm보다 작거나 같은 것의 사용량이 과다한 비교예 2에서는 래밍시공 시에 작업성이 불량하여 골재와 결합부간에 결합력이 약하고 골재가 탈락되어버리므로 부적합하였다.On the contrary, the experimental conditions and results of Comparative Examples 1-12 are as follows. In the case of Comparative Examples 1 and 2 in which the particle size of the waste refractory material is larger than 5 mm and smaller than or equal to 10 mm is outside the scope of the present invention, in Comparative Example 1, the amount of particle size larger than 5 mm and smaller than or equal to 10 mm is used. This lack of erosion was severe, excessive use of more than 5mm and less than or equal to 10mm in Comparative Example 2 was not suitable because the workability during the ramming construction poor binding strength between the aggregate and the joint and the aggregate is dropped.
비교예 3은 폐내화물의 입도 3mm 보다 크고 5mm보다 작거나 같은 것의 사용량이 부족한 경우로서, 래밍시공 시 치밀한 조직을 얻기 어려우므로 침식이 심하여 부적합하였다. 비교예 4는 폐내화물의 입도 3mm 보다 크고 5mm보다 작거나 같은 것의 사용량이 과다한 경우로서, 미분에 비해 골재량이 많으므로 시공시 최밀충진되기 어렵고 따라서 열간강도 및 냉간강도가 저하하였다.Comparative Example 3 is a case in which the amount of waste refractory particles larger than 3mm and less than or equal to 5mm is insufficient, and it is difficult to obtain dense tissue during ramming, so erosion is severe and unsuitable. Comparative Example 4 is a case where the amount of waste refractory is larger than 3mm and less than or equal to 5mm, the amount of aggregate used is excessive, the amount of aggregates compared to the fine powder is difficult to be closest to the construction and thus the hot strength and cold strength are reduced.
비교예 5는 폐내화물의 입도 1mm 보다 크고 3mm보다 작거나 같은 것의 사용량이 부족한 경우로서, 조립의 사용량이 적으므로 시공시 굵은 입자들에 의해 형성된 빈 공간을 충진시키기에는 그 사용량이 부족하므로 골재와 미분간의 결합력이 약하다. 따라서 강도가 저하되고 용선 및 슬래그에 의하여 침윤층이 두텁고 침식 또한 심하였다. 비교예 6은 폐내화물의 입도 1mm 보다 크고 3mm보다 작거나 같은 것의 사용량이 과다한 경우로서, 비교예 5와는 대조적으로 굵은 입자들에 의해 형성된 빈 공간을 충진하고 여분의 입자들이 존재하므로 이 입자들이 결합되지 못하여 침식에 의해 씻겨나가(washing) 버리므로 침식이 심하였다.Comparative Example 5 is a case where the amount of waste refractories larger than 1mm and less than or equal to 3mm is insufficient, and since the amount of assembly is small, the amount of the insufficient amount is insufficient to fill the empty space formed by the coarse particles during construction. Low differential binding force. Therefore, the strength was lowered, the infiltration layer was thick and erosion was severe due to the molten iron and slag. Comparative Example 6 is a case where the amount of waste refractory is larger than 1mm and less than or equal to 3mm excessively used, in contrast to Comparative Example 5 is filled with the empty space formed by the coarse particles and because the extra particles are present, these particles are combined The erosion was severe because it could not be washed away by erosion.
비교예 7은 폐내화물의 입도 1mm보다 작거나 같은 것의 사용량이 부족한 경우로서, 1mm 보다 크고 3mm보다 작거나 같은 것의 입자로 충진하고 남은 미세한 공간을 1mm보다 작거나 같은 것의 입자로 충진해야 하는데, 이를 하지 못하여 침식보다는 침윤층이 두터웠다. 비교예 8은 폐내화물의 입도 1mm보다 작거나 같은 것의 사용량이 과다한 경우로서, 생성된 미세공간을 충진하고 골재와 결합하고도 여분의 입자들이 남아서 이 입자들이 씻겨나가버리므로 침식이 심하였다.Comparative Example 7 is a case where the amount of waste refractory is less than or equal to 1mm of the amount used is insufficient, and filled with particles larger than 1mm and less than or equal to 3mm, and the remaining fine space is filled with particles smaller than or equal to 1mm. It could not have been thicker than the erosion layer. Comparative Example 8 is a case where the amount of the waste refractory is less than or equal to 1mm excessively used, and the erosion was severe because the particles are washed away by filling the generated microspace and combining with the aggregate.
비교예 9는 입도 0.074 mm의 탄화규소의 사용량이 부족한 경우로서, 산화에 의해 소실되어 감량된 함량을 보충하지 못하여 슬래그에 의한 침윤층이 두터웠다. 비교예 10은 입도 0.074 mm의 탄화규소의 사용량이 과다한 경우로서, 과잉의 탄화규소는 결합력이 작고 쉽게 산화되어버리므로 무게감량이 크고 내화물 조직이 느슨하여 용선 및 슬래그에 의한 침입을 받기 쉬워지므로 부적합하였다.In Comparative Example 9, when the amount of silicon carbide having a particle size of 0.074 mm was insufficient, the infiltrated layer due to slag was thick because it was lost by oxidation and could not compensate for the reduced content. Comparative Example 10 is a case where the amount of silicon carbide having a particle size of 0.074 mm is excessive, and the excess silicon carbide has a small bonding force and easily oxidizes, so that the weight loss is large and the refractory structure is loose, making it easy to invade by molten iron and slag. It was.
비교예 11은 입도 0.074 mm의 흑연 사용량이 부족한 경우로서, 산화에 의해 소실되어버리는 흑연량을 보충하지 못하여 슬래그에 의한 내젖음성이 저하하여 부적합하였다. 비교예 12는 입도 0.074 mm의 흑연 사용량이 과다한 경우로서, 흑연 자체가 윤활성이 있으므로 충진이 잘 되지 않고 산화되어버리는 양이 많아서 내화물 조직이 느슨하여 강도가 저하되어 사용에 부적합하였다.In Comparative Example 11, when the amount of graphite having a particle size of 0.074 mm was insufficient, the amount of graphite lost by oxidation could not be compensated, and the wettability due to slag was lowered, which was not suitable. Comparative Example 12 is a case where the amount of graphite having a particle size of 0.074 mm is excessive, the graphite itself is lubricating, so the filling is not good and the amount of oxidation is large, so that the refractory structure is loose and the strength is lowered, which is not suitable for use.
상기한 바와 같이, 본 발명의 실시예 1-4는 비교예 1-12에 비해 시공성 및 내침식성이 우수하고, 열간강도 및 냉간강도가 더 우수함을 나타내었다.As described above, Example 1-4 of the present invention showed excellent workability and erosion resistance, and better hot and cold strength than Comparative Examples 1-12.
상기한 바와 같이, 본 발명에서는 폐내화물을 파쇄한 후 파쇄한 전량을 표면처리 없이 바로 골재로 재활용하기 때문에 대량 발생하는 폐내화물을 처리하는 효과가 있다.As described above, in the present invention, since the entire amount of the crushed waste is refracted and immediately recycled to aggregate without surface treatment, there is an effect of treating a large amount of waste refractories.
또한, 파쇄한 폐내화물을 4등급으로 입도조정하여 일정 범위의 사용량으로 혼합함으로써 용선 및 슬래그에 대한 내침식성이 향상되는 효과가 있다.In addition, by crushing the crushed waste refractory to 4 grades by mixing in a certain amount of use has the effect of improving the corrosion resistance to molten iron and slag.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100468449B1 (en) * | 2000-12-20 | 2005-01-29 | 주식회사 포스코 | Tap hole mix for blast furnace |
| KR100505110B1 (en) * | 2000-12-22 | 2005-07-29 | 재단법인 포항산업과학연구원 | Unshaped refractories composition |
| KR100742862B1 (en) * | 2001-08-24 | 2007-07-26 | 주식회사 포스코 | Batch composition for tap hole of blast furnace |
| CN110981508A (en) * | 2019-12-10 | 2020-04-10 | 山东九龙新材料有限公司 | Refractory ramming material for repairing bottom brick of hot-metal ladle and repairing method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0664962A (en) * | 1992-08-21 | 1994-03-08 | Nippon Steel Corp | Refractory lining for furnace |
| KR950017850A (en) * | 1993-12-29 | 1995-07-20 | 조말수 | Castable Refractory Composition Containing Crude Aggregate |
| US5672146A (en) * | 1994-12-01 | 1997-09-30 | Her Majesty The Queen In Right Of Canada, As Represented By The Minister Of Energy, Mines And Resources Canada | EAF dust treatment |
| KR19990007639A (en) * | 1998-10-15 | 1999-01-25 | 이기강 | Ceramic composition using solid waste and its manufacturing method |
| KR19990053885A (en) * | 1997-12-24 | 1999-07-15 | 신현준 | Castable Refractory Containing Graphite |
-
1999
- 1999-08-12 KR KR10-1999-0033162A patent/KR100461737B1/en not_active IP Right Cessation
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0664962A (en) * | 1992-08-21 | 1994-03-08 | Nippon Steel Corp | Refractory lining for furnace |
| KR950017850A (en) * | 1993-12-29 | 1995-07-20 | 조말수 | Castable Refractory Composition Containing Crude Aggregate |
| US5672146A (en) * | 1994-12-01 | 1997-09-30 | Her Majesty The Queen In Right Of Canada, As Represented By The Minister Of Energy, Mines And Resources Canada | EAF dust treatment |
| KR19990053885A (en) * | 1997-12-24 | 1999-07-15 | 신현준 | Castable Refractory Containing Graphite |
| KR19990007639A (en) * | 1998-10-15 | 1999-01-25 | 이기강 | Ceramic composition using solid waste and its manufacturing method |
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|---|---|
| KR20010017579A (en) | 2001-03-05 |
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