KR100446872B1 - Batch composition of refractories for preventing oxidation of back surface in carbon contained acidic and neutral refractory brick - Google Patents

Batch composition of refractories for preventing oxidation of back surface in carbon contained acidic and neutral refractory brick Download PDF

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KR100446872B1
KR100446872B1 KR10-1999-0059893A KR19990059893A KR100446872B1 KR 100446872 B1 KR100446872 B1 KR 100446872B1 KR 19990059893 A KR19990059893 A KR 19990059893A KR 100446872 B1 KR100446872 B1 KR 100446872B1
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carbon
refractory brick
oxidation
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weight
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KR20010060407A (en
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홍기곤
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주식회사 포스코
재단법인 포항산업과학연구원
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • 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
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • 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
    • C04B35/515—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
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • 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
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/40—Metallic constituents or additives not added as binding phase

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Ceramic Products (AREA)

Abstract

본 발명은 전로 및 티밍래들 등의 각종 요로에 사용되는 카본함유 산중성 내화벽돌의 산화방지용 내화조성물에 관한 것으로, 본 발명에 따른 카본함유 산중성 내화벽돌의 배면산화 방지용 내화조성물은, 입도가 1 mm 이하인 알루미나 분말과 비정질 카본이 중량비로 5:95 내지 80:20의 조성으로 혼합되고, 여기에 Al, Mg, Si로 이루어진 군에서 선택된 하나 이상의 금속분말이 외삽으로 2 내지 10 중량% 이하 첨가된 것으로써, 내화벽돌의 줄눈부의 손상 및 배면산화가 방지되는 효과가 있다.The present invention relates to a fire resistant composition for preventing oxidation of carbon-containing acid neutral refractory bricks used in various urinary furnaces such as converters and teaming ladles. Alumina powder of 1 mm or less and amorphous carbon are mixed in a weight ratio of 5:95 to 80:20, and at least one metal powder selected from the group consisting of Al, Mg, and Si is added by 2 to 10% by weight by extrapolation. By doing so, there is an effect of preventing damage and joint oxidation of the joint of the refractory brick.

Description

카본함유 산중성 내화벽돌의 배면산화 방지용 내화조성물{BATCH COMPOSITION OF REFRACTORIES FOR PREVENTING OXIDATION OF BACK SURFACE IN CARBON CONTAINED ACIDIC AND NEUTRAL REFRACTORY BRICK}BATCH COMPOSITION OF REFRACTORIES FOR PREVENTING OXIDATION OF BACK SURFACE IN CARBON CONTAINED ACIDIC AND NEUTRAL REFRACTORY BRICK}

본 발명은 전로 및 티밍래들 등의 각종 요로에 사용되는 카본함유 산중성 내화벽돌의 산화방지용 내화조성물에 관한 것으로, 더욱 상세하게는 입도가 1 mm 이하인 알루미나 분말과 비정질 카본이 중량비로 5:95 내지 80:20의 조성으로 혼합되고, 여기에 Al, Mg, Si로 이루어진 군에서 선택된 하나 이상의 금속분말이 외삽으로 2 내지 10 중량% 이하 첨가된 카본함유 산중성 내화벽돌의 배면산화 방지용 내화조성물에 관한 것이다.The present invention relates to an oxidation-resistant refractory composition of carbon-containing acid-resistant refractory bricks used in various urinary furnaces, such as converters and teaming ladles. More specifically, alumina powder having a particle size of 1 mm or less and amorphous carbon in a weight ratio of 5:95 To a refractory composition for preventing oxidation of the backside of the carbon-containing acid-resistant refractory brick in which at least one metal powder selected from the group consisting of Al, Mg, and Si is extrapolated from 2 to 10% by weight. It is about.

일반적으로 전로 및 티밍래들과 같은 제강용 요로에는 Al2O3-SiC-C, Al2O3-C 또는 Al2O3-MgO-C질의 카본함유 산중성 내화벽돌이 사용되고 있다. 이러한 카본함유 산중성 내화벽돌은 용강이나 슬래그에 대한 내식성은 우수하지만, 장기간 사용시 내화벽돌의 줄눈부 및 배면에 산화가 수반되어 내화벽돌의 열화로 인한 노체수명의 단축이 초래된다.Generally, carbon-containing acid-resistant firebrick of Al 2 O 3 -SiC-C, Al 2 O 3 -C or Al 2 O 3 -MgO-C is used for steel making furnaces such as converters and Timing ladles. Such carbon-containing acid neutral refractory bricks have excellent corrosion resistance to molten steel or slag, but when used for a long time, the joints and the back of the refractory bricks are oxidized, resulting in shortening of the life span due to deterioration of the refractory bricks.

카본함유 산중성 내화벽돌에 사용되는 수계 몰탈은 예열시 수증기의 발생으로 인해 내화벽돌의 특성을 저하시키고, 특히 배면에서는 카본함유 산중성 내화벽돌의 산화손상을 조장하는 단점이 있다.Aqueous mortar used in the acid-containing refractory brick containing carbon deteriorates the characteristics of the refractory brick due to the generation of water vapor during preheating, and in particular, the rear side has the disadvantage of promoting oxidation damage of the acid-containing refractory brick containing carbon.

따라서, 카본함유 산중성 내화벽돌의 배면산화를 방지하여 그 수명을 연장시키고 또한 내화벽돌의 산화손상이 발생하지 않는 내화조성물의 개발이 필요하다.Therefore, it is necessary to prevent the backside oxidation of carbon-containing acid neutral refractory bricks to extend their lifespan and to develop a refractory composition that does not cause oxidative damage of the refractory bricks.

본 발명은 상기한 바와 같은 문제점을 해결하기 위한 것으로, 그 목적은 카본함유 산중성 내화벽돌의 줄눈손모 및 배면산화를 방지하여 내화벽돌의 내용성을 증진시키는 카본함유 산중성 내화벽돌의 배면산화 방지용 내화조성물을 제공하는 데 있다.The present invention is to solve the problems as described above, the object is to prevent the rear wear of carbon-containing acid neutral refractory bricks and to prevent the back oxidation of the carbon-containing acid neutral refractory brick to prevent the oxidation of the back To provide a fireproof composition.

상기한 바와 같은 목적을 달성하기 위하여, 본 발명에 따른 카본함유 산중성 내화벽돌의 배면산화 방지용 내화조성물은 입도가 1 mm 이하인 알루미나 분말과 비정질 카본이 중량비로 5:95 내지 80:20의 조성으로 혼합되고, 여기에 Al, Mg, Si로 이루어진 군에서 선택된 하나 이상의 금속분말이 외삽으로 2 내지 10 중량% 이하 첨가되는 것을 특징으로 한다.In order to achieve the object as described above, the refractory composition for preventing the rear oxidation of the carbon-containing acid neutral refractory brick according to the present invention is composed of alumina powder having a particle size of 1 mm or less and amorphous carbon in a weight ratio of 5:95 to 80:20. It is mixed, it is characterized in that at least one metal powder selected from the group consisting of Al, Mg, Si is added by extrapolation 2 to 10% by weight or less.

이하, 본 발명에 따른 카본함유 산중성 내화벽돌의 배면산화 방지용 내화조성물에 대해 상세히 설명한다.Hereinafter, the refractory composition for preventing the rear oxidation of the carbon-containing acid neutral refractory brick according to the present invention will be described in detail.

본 발명에서 사용되는 알루미나 분말로서 특별히 한정하는 것은 없으며 전융 알루미나 분말, 소결 알루미나 분말 중 어느 것을 사용하여도 무방하나, 불순물의영향을 최소화하기 위하여 순도가 98% 이상인 것이 바람직하다.There is no particular limitation on the alumina powder used in the present invention, and any one of an alumina powder and a sintered alumina powder may be used, but in order to minimize the influence of impurities, the purity is preferably 98% or more.

알루미나 분말의 입자크기는 1 mm 이하인 것이 바람직하며, 그 이유는 입도가 1 mm를 초과할 경우 줄눈부의 틈새간격이 커져 줄눈부의 손상이 커지고 배면에서의 충진성이 저하되어 카본함유 내화벽돌의 산화방지 효과가 저하되기 때문이다.The particle size of the alumina powder is preferably 1 mm or less. The reason for this is that when the particle size exceeds 1 mm, the gap gap of the joint increases, resulting in increased damage to the joint and lowering the filling property on the back, thereby preventing oxidation of the refractory brick containing carbon. This is because the effect is reduced.

비정질 카본의 입자크기는 일반적으로 1 mm 이하이므로 입자크기에 대해 특별히 한정하는 것은 없으며, 불순물에 의한 반응을 억제하기 위하여 순도가 95% 이상인 것이 바람직하다.Since the particle size of amorphous carbon is generally 1 mm or less, there is no particular limitation on the particle size, and in order to suppress the reaction due to impurities, the purity is preferably 95% or more.

이러한 알루미나 분말과 비정질 카본을 중량비로 5:95 내지 80:20으로 혼합한다. 알루미나 분말의 함유량이 5 중량% 미만이면 알루미나 분말이 부족하여 카본함유 산중성 내화벽돌 배면산화 방지용 내화조성물의 충진이 불량하여 산화방지 효과가 저하되며, 알루미나 분말의 함유량이 80 중량%를 초과하면 알루미나 분말의 함유량이 과다하고 상대적으로 비정질 카본의 함유량이 적어지므로 카본함유 산중성 내화벽돌의 산화방지 효과가 저하되기 때문이다.Such alumina powder and amorphous carbon are mixed in a weight ratio of 5:95 to 80:20. If the content of the alumina powder is less than 5% by weight, the alumina powder is insufficient and the filling of the refractory composition for preventing acid oxidation refractory bricks having a carbon content is poor, and the antioxidant effect is lowered. If the content of the alumina powder exceeds 80% by weight, the alumina powder This is because the content of the powder is excessive and the content of amorphous carbon is relatively low, so that the antioxidant effect of the acid-containing refractory brick containing carbon is lowered.

이러한 알루미나 분말과 비정질 카본의 혼합물에 비정질 카본의 산화방지를 목적으로 Al, Mg, Si으로 이루어진 군에서 선택된 하나 이상의 금속분말을 첨가하며, 그 첨가량은 외삽으로 2 내지 10 중량% 이하가 되도록 한다. 이것은, 금속분말의 첨가량이 10 중량%를 초과하면 사용시 금속분말로부터 유래되는 산화물의 생성에 의한 체적팽창에 의하여 줄눈부의 틈이 커져 카본함유 산중성 내화벽돌의 손상을 초래하며, 금속분말의 첨가량이 2 중량% 미만이면 비정질 카본의 산화방지 효과가 미약하여 카본함유 산중성 내화벽돌의 줄눈부나 배면의 산화방지력이 저하되기때문이다.One or more metal powders selected from the group consisting of Al, Mg, and Si are added to the mixture of the alumina powder and the amorphous carbon for the purpose of preventing oxidation of the amorphous carbon, and the amount of the alumina powder is extrapolated to 2 to 10 wt% or less. This means that when the amount of the metal powder added exceeds 10% by weight, the gap between the joints increases due to the volume expansion caused by the production of oxides derived from the metal powder during use, resulting in damage of the acid-containing refractory brick containing carbon, and the amount of the metal powder added If it is less than 2% by weight, the antioxidant effect of amorphous carbon is weak, and the oxidation resistance of the joint or the back side of the acid-containing acid-resistant refractory brick containing carbon is lowered.

이러한 금속분말은 상용의 금속분말을 사용하여도 무방하나 다만, 금속분말의 첨가효과가 충분히 발휘되도록 입자크기가 50 ㎛ 이하인 것이 바람직하며, 불순물에 의한 반응을 억제하기 위하여 순도가 95% 이상인 것이 바람직하다.The metal powder may be a commercially available metal powder, but the particle size is preferably 50 μm or less so as to sufficiently exhibit the effect of adding the metal powder, and the purity is 95% or more in order to suppress the reaction by impurities. Do.

상기한 바와 같은 내화조성물을 시공할 때에는 시공성의 확보를 위하여 물 또는 오일 중 어느것을 사용하여도 무방하며, 경우에 따라서는 물이나 오일의 첨가없이 내화조성물을 사용할 수도 있다.When constructing a refractory composition as described above, either water or oil may be used to secure workability, and in some cases, a refractory composition may be used without addition of water or oil.

이하, 본 발명의 일실시예를 상세히 설명한다.Hereinafter, an embodiment of the present invention will be described in detail.

실시예 1, 실시예 2 및 실시예 3으로서, 입도가 1 mm 이하인 소결 알루미나 분말과 비정질 카본을 중량비로 각각 5:95, 40:60 및 80:20으로 혼합하였다. 여기에 금속분말을 외삽으로 첨가하였는데, 실시예 1에서는 Mg을 2 중량%, Al을 6 중량%, Si을 2 중량% 첨가하였고, 실시예 2에서는 Al을 3 중량%, Si을 2 중량% 첨가하였으며, 실시예 3에서는 Al을 2 중량% 첨가하였다. 이러한 조성의 내화조성물에 오일을 15 중량% 첨가하여 티밍래들의 메탈 라인용 Al2O3-MgO-C질의 내화벽돌의 배면에 적용하였다.As Example 1, Example 2 and Example 3, sintered alumina powder having a particle size of 1 mm or less and amorphous carbon were mixed in a weight ratio of 5:95, 40:60 and 80:20, respectively. Metal powder was extrapolated thereto. In Example 1, 2% by weight of Mg, 6% by weight of Al and 2% by weight of Si were added. In Example 2, 3% by weight of Al and 2% by weight of Si were added. In Example 3, 2 wt% Al was added. 15 wt% of oil was added to the refractory composition of this composition and applied to the back surface of the Al 2 O 3 -MgO-C fired brick for the metal line of the Timing ladle.

이 티밍래들에 용강을 120회 출강하여 조업한 후, Al2O3-MgO-C질 내화벽돌의 잔존량이 50 mm인 것을 기준으로 하였을 때 내화벽돌 배면의 산화층의 평균두께를 측정하였으며, 그 결과를 조성과 함께 표 1에 나타내었다.After the molten steel was operated by tapping 120 times on the Timing Ladle, the average thickness of the oxide layer on the back side of the refractory brick was measured based on the residual amount of Al 2 O 3 -MgO-C-quality refractory brick of 50 mm. The results are shown in Table 1 together with the composition.

또한, 티밍래들의 120회 출강후, 비교예 2를 기준으로 하였을 때, Al2O3-MgO-C질 내화벽돌의 줄눈부위의 비교손상지수를 표 1에 나타내었으며, 비교예 2에 대해서는 다음에 설명하기로 한다.In addition, the comparative damage index of the joint area of Al 2 O 3 -MgO-C vaginal refractory bricks is shown in Table 1 after 120 times of Timing Ladle, based on Comparative Example 2. This will be explained in.

한편, 비교예로서 본 발명에서 언급한 알루미나 분말의 입도와, 알루미나 분말과 비정질 카본의 혼합비 또는 금속분말의 첨가량 범위에서 벗어난 조성으로 내화조성물을 제조하고 이를 본 발명의 실시예와 같은 방법으로 티밍래들에 적용하여 내화벽돌 배면의 산화층의 평균두께 및 줄눈부 손상지수를 측정하였으며, 그 결과와 조성이 본 발명의 실시예와 함께 표 1에 나타나있다.Meanwhile, as a comparative example, a refractory composition was prepared in a composition outside of the particle size of the alumina powder mentioned in the present invention, the mixing ratio of the alumina powder and the amorphous carbon, or the addition amount of the metal powder, and the same as the embodiment of the present invention. The average thickness and joint damage index of the oxide layer on the back of the refractory bricks were measured by applying to the field, and the results and compositions are shown in Table 1 together with the examples of the present invention.

비교예 1에서는 알루미나 분말의 입도를 본 발명의 범위에서 벗어난 1 mm 초과인 것을 사용하고 금속분말의 첨가량은 Mg을 10 중량%, Si을 1 중량% 첨가하였다. 비교예 2 및 3에서는, 입도가 1 mm 이하인 소결 알루미나 분말과 비정질 카본을 각각 본 발명의 범위에서 벗어난 혼합비인 1:99 및 90:10의 중량비로 혼합하였다. 비교예 4 및 5에서는 1 mm 이하 입도의 소결 알루미나 분말과 비정질 카본을 각각 10:90 및 20:80의 중량비로 혼합하고 여기에 금속분말의 첨가량을 본 발명의 범위에서 벗어난 것으로 혼합하였다. 즉, 비교예 4에서는 Mg을 1 중량% 첨가하였으며, 비교예 5에서는 Mg을 8 중량%, Al을 2 중량%, Si을 2 중량% 첨가하였다.In Comparative Example 1, a particle size of the alumina powder exceeding 1 mm outside the range of the present invention was used, and the metal powder was added in an amount of 10 wt% Mg and 1 wt% Si. In Comparative Examples 2 and 3, the sintered alumina powder and the amorphous carbon having a particle size of 1 mm or less were mixed in a weight ratio of 1:99 and 90:10, respectively, which were outside the scope of the present invention. In Comparative Examples 4 and 5, the sintered alumina powder and the amorphous carbon having a particle size of 1 mm or less were mixed at a weight ratio of 10:90 and 20:80, respectively, and the addition amount of the metal powder was mixed out of the scope of the present invention. That is, in Comparative Example 4, 1% by weight of Mg was added. In Comparative Example 5, 8% by weight of Mg, 2% by weight of Al, and 2% by weight of Si were added.

실시예Example 비교예Comparative example 1One 22 33 1One 22 33 44 55 소결 알루미나의 입도 (mm)Particle Size of Sintered Alumina (mm) 1 이하1 or less 1 이하1 or less 1 이하1 or less 1 초과Greater than 1 1 이하1 or less 1 이하1 or less 1 이하1 or less 1 이하1 or less 소결 알루미나와 비정질 카본의 혼합비 (중량비)Mixing ratio of sintered alumina and amorphous carbon (weight ratio) 5:955:95 40:6040:60 80:2080:20 50:5050:50 1:991:99 90:1090:10 10:9010:90 20:8020:80 금속분말(외삽, 중량%)Metal powder (extrapolated, weight%) MgMg 22 -- -- -- 22 -- 1One 88 AlAl 66 33 22 1010 22 33 -- 22 SiSi 22 22 -- 1One -- 33 -- 22 배면 산화층의 두께 (mm)Back oxide layer thickness (mm) 22 33 55 2525 1717 1616 2626 1414 줄눈부 손상지수Joint Damage Index 0.10.1 0.10.1 0.20.2 1.41.4 1.01.0 1.11.1 0.90.9 1.31.3

표 1에 도시된 바와 같이, 실시예 1 내지 3의 결과, 내화벽돌의 배면 산화층은 각각 2 mm, 3 mm 및 5 mm 정도로 매우 얇은 것으로서, 배면산화 방지의 역할을 충분히 수행한 것이다. 또한 줄눈부 손상지수 또한 0.1 또는 0.2로서 매우 낮아서 비교예 2에 비해 줄눈부의 손상이 현격히 낮음을 알 수 있다.As shown in Table 1, as a result of Examples 1 to 3, the back oxide layer of the refractory brick was very thin, about 2 mm, 3 mm, and 5 mm, respectively, and sufficiently performed the role of the back oxidation prevention. In addition, the joint damage index is also very low as 0.1 or 0.2, it can be seen that the damage of the joint is significantly lower than that of Comparative Example 2.

반면에, 본 발명의 범위를 벗어난 비교예 1 내지 5에서는 배면 산화층의 두께가 14 mm 내지 25mm로 매우 두껍기 때문에 배면산화가 거의 방지되지 못하였으며, 줄눈부의 손상 역시 본 발명의 실시예에 비해 매우 심함을 알 수 있다.On the other hand, in Comparative Examples 1 to 5 outside the scope of the present invention, since the thickness of the rear oxide layer was very thick, from 14 mm to 25 mm, the rear oxidation was hardly prevented, and the damage of the joint was also very severe compared to the embodiment of the present invention. It can be seen.

상기한 바와 같이, 본 발명에 따른 카본함유 산중성 내화벽돌의 배면 산화방지용 내화조성물을 이용하면 내화벽돌의 줄눈부의 손상 및 배면산화가 방지되는 효과가 있다.As described above, when the refractory composition for preventing oxidation of the acid-containing acid-resistant refractory brick containing carbon according to the present invention is used, damage and back oxidation of the joint of the refractory brick are prevented.

Claims (2)

입도가 1 mm 이하인 알루미나 분말과 비정질 카본이 중량비로 5:95 내지 80:20의 조성으로 혼합되고, 여기에 Al, Mg, Si으로 이루어진 군에서 선택된 하나이상의 금속분말이 외삽으로 2 내지 10 중량% 첨가된 카본함유 산중성 내화벽돌의 배면산화 방지용 내화조성물.Alumina powder having a particle size of 1 mm or less and amorphous carbon are mixed in a weight ratio of 5:95 to 80:20, and at least one metal powder selected from the group consisting of Al, Mg, and Si is extrapolated from 2 to 10% by weight. Refractory composition for prevention of back oxidation of added carbon-containing acid neutral refractory brick. 제 1 항에 있어서, 상기 알루미나 분말은 순도가 98% 이상인 것을 사용하고, 상기 비정질 카본은 순도가 95% 이상인 것을 사용하며, 상기 금속분말은 입도가 50 ㎛ 이하이고, 순도가 95% 이상인 것을 사용하는 것을 특징으로 하는 카본함유 산중성 내화벽돌의 배면산화 방지용 내화조성물.According to claim 1, wherein the alumina powder is used with a purity of 98% or more, the amorphous carbon is used with a purity of 95% or more, the metal powder is used having a particle size of 50 ㎛ or less, purity of 95% or more A refractory composition for preventing back oxidation of a carbon-containing acid neutral firebrick, characterized in that
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KR100601086B1 (en) * 2001-12-22 2006-07-14 주식회사 포스코 Refractory mortar for basic refractory bricks
KR100569752B1 (en) * 2001-12-22 2006-04-10 주식회사 포스코 Refractory mortar with acid and neutral compositions
KR100770172B1 (en) * 2006-07-07 2007-10-25 재단법인 포항산업과학연구원 Refractory composition for tap hole in melter-gasifier of finex

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KR840003593A (en) * 1981-10-26 1984-09-15 사까다 데쓰오 Carbon-containing firebrick
KR960022375A (en) * 1994-12-28 1996-07-18 김만제 Carbon-containing fireproof composition
JPH08319170A (en) * 1995-05-25 1996-12-03 Toshiba Ceramics Co Ltd Alumina carbon prepared unshaped refractory for molten metal
KR19980052567A (en) * 1996-12-24 1998-09-25 서상기 Magnesia-alumina-carbon basic bricks for ladle

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KR840003593A (en) * 1981-10-26 1984-09-15 사까다 데쓰오 Carbon-containing firebrick
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