KR100723131B1 - Batch composition for taphole mix of blast furnace - Google Patents
Batch composition for taphole mix of blast furnace Download PDFInfo
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- KR100723131B1 KR100723131B1 KR1020010051230A KR20010051230A KR100723131B1 KR 100723131 B1 KR100723131 B1 KR 100723131B1 KR 1020010051230 A KR1020010051230 A KR 1020010051230A KR 20010051230 A KR20010051230 A KR 20010051230A KR 100723131 B1 KR100723131 B1 KR 100723131B1
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
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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
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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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
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
- C04B35/632—Organic additives
- C04B35/634—Polymers
- C04B35/63496—Bituminous materials, e.g. tar, pitch
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Abstract
본 발명은 고로 출선구의 폐쇄에 사용되는 내화물에 관한 것으로, 그 목적은 용선 및 슬랙에 의한 침식과 마모에 대한 저항성이 우수한 고로 출선구 폐쇄용 내화물을 제공하는 것이다.The present invention relates to a refractory used for closing the blast furnace outlet, the object is to provide a refractory for closing the blast furnace outlet excellent in resistance to erosion and wear caused by molten iron and slack.
상기 목적을 달성하기 위한 본 발명은, 중량%로 전융질 알루미나: 27-42%, 탄화규소: 10-20%, 스피넬: 5-9%, 하소알루미나: 4-6%, 산화크롬: 3-5%, 점토: 9-12%, 코크스: 6-11%, 핏치: 3-6%, 금속실리콘: 3-5%, 질화규소철:6-8%로 조성되는 기본조성에 외삽으로 타르 12~17%로 조성되는 고로 출선구 폐쇄용 내화물에 관한 것을 그 기술적요지로 한다.
In order to achieve the above object, the present invention, in terms of weight percent of the all-aluminum alumina: 27-42%, silicon carbide: 10-20%, spinel: 5-9%, calcined alumina: 4-6%, chromium oxide: 3- 5%, clay: 9-12%, coke: 6-11%, pitch: 3-6%, metal silicon: 3-5%, silicon nitride: 6-8%. The technical subject matter shall be the refractory for closing the blast furnace exit, which is made up of 17%.
고로 출선구, 내침식성, 전융질 알루미나, 하소알루미나 Blast Furnace Outlet, Corrosion Resistance, All-Alumina, Calcined Alumina
Description
본 발명은 고로 출선구의 폐쇄에 사용되는 내화물에 관한 것으로, 보다 상세하게는 고로 출선구의 폐쇄에 적합한 내침식성이 우수한 내화물에 관한 것이다.
The present invention relates to a refractory used for closing the blast furnace outlet, and more particularly to a refractory excellent corrosion resistance suitable for closing the blast furnace outlet.
최근에는 대형고로의 출현에 따른 고온, 고압조업으로 출선량, 출선회수가 증가되고 있는 추세이므로, 고로의 노황유지 및 출선작업부하 저감을 위한 대책으로 장시간의 출선에 견딜 수 있는 내침식성이 우수한 내화물이 요구되고 있다.
In recent years, with the high temperature and high pressure operation in line with the emergence of large blast furnaces, the number of draws and the number of draws are increasing. This is required.
고로 출선구 폐쇄용 내화물에 관한 종래의 기술들 중에서 대표적인 것으로는 일본특허공개공보 99-29366, 특허공개공보 99-1374를 들 수 있다.
Representative examples of the related arts related to blast furnace exit closing refractory materials include Japanese Patent Application Laid-Open No. 99-29366 and Japanese Patent Application Laid-Open No. 99-1374.
상기 일본 특허공개공보 99-29366호는 알루미나질 원료:30~50중량%, 실리카질 원료를 2~5중량%, 탄화규소를 15~25중량%, 탄소질원료를 5~10중량%, 질화물을 15~30중량%, 금속분말을 5~15중량%에서 구성된 내화골재 100에 대해, 결합재의 액상타르를 외삽으로 10~17중량% 첨가한 고로출선구개질용 머드재에 관한 것이다. 이 머드재는 용선, 슬랙에 대한 마모강도를 향상하여 용적안정성과 조직의 치밀화를 목적으로 한 것이다.
Japanese Patent Application Laid-Open No. 99-29366 discloses an alumina raw material: 30-50% by weight, silica raw material 2-5% by weight, silicon carbide 15-25% by weight, carbonaceous raw material 5-10% by weight, nitride To 15 to 30% by weight, the metal powder is 5 to 15% by weight of the refractory aggregate 100 composed of, relates to a mud material for blast furnace forehead modification modified by extrapolating 10 to 17% by weight of liquid tar of the binder. This mud material is intended to improve the wear strength of molten iron and slack for the purpose of volume stability and densification of tissue.
또한, 상기 일본 특허공개공보 99-1374호는 내화골재와, 탄소질원료와, 내화점토와 , 바인더를 배합하여 되는 출선구용 머드재료서 상기 바인더가 석탄입자와, 아민류 등과 같은 유기용제, 석탄입자와 타르증류물을 함유하는 출선구 폐쇄용내화물로서 조강성 및 내식성 향상을 목적으로 한 것이다.
In addition, Japanese Patent Application Laid-Open No. 99-1374 is a mud material for an exit port in which refractory aggregates, carbonaceous raw materials, refractory clays, and binders are mixed. The binders are organic solvents such as coal particles, amines, and coal particles. It is for the purpose of improving the roughness and corrosion resistance as a receptacle for closing the exit opening containing a distillate of tar.
이들은 모두 출선구 폐쇄용 내화물의 구비조건인 용선, 슬랙에 대한 내침식성 및 용적안정성 향상을 목적으로 하고 있으나, 고온에서의 용적안정성 및 출선말기에 슬랙에 의해 출선구의 확대가 일어나는 등 내침식성에 문제점이 있다.
They are all aimed at improving the corrosion resistance and volume stability of molten iron and slag, which are the conditions for the refractory for closing the exit port.However, the volume stability at high temperature and the expansion of the exit port due to slack at the end of the departure point are There is a problem.
이에, 본 발명자들은 상기 문제점을 해결하기 위해 연구와 실험을 거듭하고, 그 결과에 근거하여 본 발명을 제안하게 된 것으로서, 본 발명은 용선 및 슬랙에 의한 침식과 마모에 대한 저항성이 우수한 고로 출선구 폐쇄용 내화물을 제공하는데, 그 목적이 있다. Accordingly, the present inventors have repeatedly studied and experimented to solve the above problems, and based on the results, the present invention proposes the present invention, and the present invention has excellent resistance to erosion and abrasion by molten iron and slack. To provide a refractories for closure, the purpose is to.
상기 목적을 달성하기 위한 본 발명의 고로출선구 폐쇄용 내화물은, 중량%로 전융 질 알루미나: 27-42%, 탄화규소: 10-20%, 스피넬: 5-9%, 하소알루미나: 4-6%, 산화크롬: 3-5%, 점토: 9-12%, 코크스: 6-11%, 핏치: 3-6%, 금속실리콘: 3-5%, 질화규소철:6-8%로 조성되는 기본조성에 외삽으로 타르 12~17%로 조성되는 것이다.
Refractory for closing the blast furnace outlet of the present invention for achieving the above object, by weight% electrolytic alumina: 27-42%, silicon carbide: 10-20%, spinel: 5-9%, calcined alumina: 4-6 %, Chromium oxide: 3-5%, clay: 9-12%, coke: 6-11%, pitch: 3-6%, metal silicon: 3-5%, silicon nitride: 6-8% Extrapolation to the composition is 12 to 17% tar.
이하, 본 발명을 보다 상세히 설명한다.Hereinafter, the present invention will be described in more detail.
본 발명자들은 고로출선구 내화물의 내침성 등의 제반물성을 개선하기 위하여, The inventors of the present invention, in order to improve the overall physical properties, such as resistance to blast furnace outlet refractory,
(1) 출선구 폐쇄용 내화물의 내침식성을 고려하여 침식에 강한 전융알루미나를 골재로 선택하면서 (1) In consideration of the erosion resistance of the refractories for closing the exit opening,
(2) 폐쇄재의 내침식성 증진을 위해서는 골재를 연결하는 결합부에 초미분원료인 하소알루미나를 첨가하여 소결을 촉진시켜 내화물조직을 치밀하게 하고, (2) In order to enhance the corrosion resistance of the closure material, calcination is promoted by adding calcined alumina, which is an ultra fine powder, to the joints connecting the aggregates, thereby densifying the refractory structure,
(3) 알루미나-마그네시아계 스피넬을 첨가하여 팽창성을 높여서 구재(잔존)와 신재질간의 접착력을 좋게 하고, (3) Alumina-magnesia spinel is added to increase the expandability to improve adhesion between old and new materials.
(4) 산화크롬을 사용하여 고온에서 저융물생성을 억제함으로써, 용선 및 슬랙에 의한 침식과 마모에 대한 저항성을 개선하는데, 특징이 있는 것이다.
(4) It is characterized by improving the resistance to erosion and abrasion by molten iron and slack by suppressing the formation of low melt at high temperature using chromium oxide.
[전융질 알루미나]Electrolytic Alumina
내화물에서 알루미나로는 전융알루미나, 소결알루미나 등과 같은 고순도의 인공 합성원료와 천연의 보키사이트 등이 사용되고 있다. 이중에서 결정입자가 조대한 전융알루미나가 내침식성에 있어서 효과적이므로, 본 발명의 내화조성물에서는 전융질알루미나를 27~42% 사용한다. 전융질 알루미나의 사용량이 27중량% 이하가 되면 내침식성이 저하되어 부적당하며 42중량%이상이 되면 내침식성은 양호하지만 재질자체의 경도가 높게되어 개공성이 불량하게 된다.
As alumina in refractory materials, high-purity artificial synthetic raw materials such as electrolytic alumina, sintered alumina, and natural bokisite are used. Among these, since the coarse electrolytic alumina having coarse crystal grains is effective in erosion resistance, the refractory composition of the present invention uses 27 to 42% of the electrolytic alumina. If the amount of the all-aluminum alumina is less than 27% by weight, the corrosion resistance is inadequate and is inadequate. If it is more than 42% by weight, the corrosion resistance is good, but the hardness of the material itself is high, resulting in poor porosity.
[탄화규소]Silicon Carbide
탄화규소는 슬랙에 대한 침식저항성을 높이고 탄소의 산화방지에 효과적이므로 10~20중량% 사용한다. 탄화규소의 사용량이 10중량%이하이면 탄화규소의 산화에 의하여 생성되는 산화규소의 생성량이 적어 산화억제효과가 저하되며, 20중량% 이상 사용은 탄화규소가 자체소결성이 없으므로 강도를 저하시킨다.
Silicon carbide should be used in an amount of 10 to 20% by weight because it increases erosion resistance against slack and is effective in preventing oxidation of carbon. When the amount of silicon carbide is less than 10% by weight, the amount of silicon oxide produced by the oxidation of silicon carbide is small, the oxidation inhibitory effect is reduced, and the use of more than 20% by weight of silicon carbide is not self-sintering, so the strength is lowered.
[스피넬][Spinel]
스피넬은 팽창성을 부여하는데 효과적이다. 일반적으로 스피넬은 알루미나-마그네시아계 스피넬을 지칭한다. 대표적인 스피넬 크링커는 Al2O3가 약 72중량%, MgO가 약 28중량% 함유된 것을 예로 들 수 있다(내용확인 바람). 스피넬 미분의 사용량이 5중량%이하이면 팽창성을 유도하는데 효과가 없으며, 9중량%이상이 되면 팽창이 커서 사용중에 균열이 생기게된다.
Spinel is effective for imparting expandability. Spinel generally refers to alumina-magnesia based spinel. Representative spinel clinker may include, for example, about 72% by weight of Al 2 O 3 and about 28% by weight of MgO. If the amount of spinel fine powder is less than 5% by weight, it is not effective to induce expandability. If the amount of spinel fine powder is more than 9% by weight, the expansion is large and cracks are generated during use.
[하소 알루미나][Calcined alumina]
상기 하소알루미나는 초미분원료로서 활성이 있으므로 폐쇄용내화물의 소결을 촉진시켜 내화물의 결합부를 치밀하고 강고하게 하는 역할을 한다. 본 발명에서는 하소 알루미나를 4~6중량% 사용하는데, 그 사용량이 4중량%이하에서는 사용량이 부족하여 소결촉진에 기여를 못하며, 6중량%이상에서는 사용량이 과다하여 고온에서 과소결로 인한 수축이 심하여 작업성이 불량하게 된다.
Since the calcined alumina is active as an ultra fine powder, it serves to promote the sintering of the closed refractory material and to tightly and firmly bond the refractory bonding portion. In the present invention, the calcined alumina is used 4 ~ 6% by weight, the amount of the use is less than 4% by weight is insufficient to contribute to the promotion of sintering, the use of more than 6% by weight is excessive shrinkage due to excessive sintering at high temperature Workability becomes poor.
[산화크롬][Chrome Oxide]
상기 산화크롬은 소결을 촉진하고, 고온에서 저융물생성을 억제하는 역할을 한다. 본 발명에서 산화크롬은 3~5중량% 사용하는데, 그 사용량이 3중량%이하에서는 소결촉진효과가 적고, 5중량%이상에서는 융점이 저하되어 저융물 생성량이 많게 된다.
The chromium oxide promotes sintering and serves to suppress low melt formation at high temperatures. In the present invention, chromium oxide is used in 3 to 5% by weight, the amount is less than 3% by weight of the sintering promoting effect, less than 5% by weight of the melting point is lowered to produce a lot of low melt.
[점토][clay]
상기 점토는 가소성을 부여하기 위하여 사용되며, 9~12중량% 사용한다. 그 사용량이 9중량%이하에서는 가소성부족으로 작업성이 좋지 않고 충진시 균열이 생겨 용선 및 슬랙의 침투로 개공성 불량이 될 뿐 만 아니라 심도저하의 원인이 된다. 그러나 사용량이 12중량%이상에서는 슬랙과 반응하여 저융물을 다량 생성하므로 침식이 심하여 출선말기에 출선구경 확대를 초래한다.
The clay is used to give plasticity, it is used 9 to 12% by weight. If the amount is less than 9% by weight, the plasticity is insufficient, the workability is not good, cracking occurs during filling, not only the poor porosity due to the penetration of molten iron and slack, but also causes the depth of depth. However, when the amount of use is more than 12% by weight, a large amount of low melt is generated by reacting with the slack, so that erosion is severe, leading to an expansion of the diameter of the starting line at the end of the starting line.
[코크스][cokes]
상기 코크스는 미세기공을 형성케하여 가스유출을 좋게하고 개공성을 높이는 역할을 한다. 본 발명에서 사용량은 6~11중량%로 하는데, 사용량이 6중량%이하에서는 미세기공 형성효과가 작고, 11중량%이상에서는 미세기공 생성이 과다하여 강도를 저하시킨다. The coke serves to form fine pores to improve gas outflow and increase porosity. In the present invention, the amount used is 6 to 11% by weight, the amount of use is less than 6% by weight, the effect of forming micropores is small, and more than 11% by weight of the micropore is excessively reduced in strength.
[핏치][Pitch]
상기 핏치는 기공율을 낮추고 슬랙에 대한 내침식성을 높이는 역할을 한다. 본 발명에서 사용량은 3~6중량% 사용하는데, 그 사용량이 3중량%이하에서는 슬랙에 대한 내침식성 개선 효과가 적고, 사용량이 6중량%이상에서는 기공율이 불규칙하게 커져서 내침식성은 현저하게 저하된다.
The pitch serves to lower porosity and increase corrosion resistance to slack. In the present invention, the usage amount is used 3 to 6% by weight, the amount is less than 3% by weight, the effect of improving the erosion resistance to slack is less, when the amount is more than 6% by weight the porosity is irregularly large, the corrosion resistance is significantly reduced. .
[금속실리콘과 질화규소철][Metal Silicon and Silicon Nitride]
상기 금속실리콘 및 질화규소철은 고온에서 소결을 촉진하여 고온강도를 높이는 작용을 하며 단독 사용보다는 양 원료의 병행사용이 효과적이다. 금속실리콘과 질화규소철은 각각 사용량이 3중량%이하와 6중량%이하에서는 소결촉진효과가 작으므로 고온강도가 크지 않다. 사용량이 5중량%이상과 8중량%이상에서는 강도증진효과는 있으나 과소결로 조직이 치밀하게되어 개공성이 불량하게된다.
The metal silicon and silicon nitride promote the sintering at a high temperature to increase the high temperature strength, and the parallel use of both raw materials is more effective than the single use. When the amount of metal silicon and silicon nitride is less than 3% by weight and less than 6% by weight, respectively, the sintering promoting effect is small, so that the high temperature strength is not large. If the amount is more than 5% by weight and more than 8% by weight, the effect of strength is increased, but due to oversintering, the structure becomes dense and the porosity is poor.
[타르][tar]
타르는 결합제로서 첨가하는데 그 첨가량은 외삽으로 12~17중량% 첨가하는 것이 바람직하다. 타르의 첨가량이 12중량% 미만이면 작업성이 떨어지고, 17중량%를 초과하면 휘발분이 많아서 좋지 않다.
Tar is added as a binder, but the amount is preferably 12 to 17 wt% by extrapolation. If the added amount of tar is less than 12% by weight, workability is inferior, and if it exceeds 17% by weight, it is not good because there are many volatile matters.
이하, 본 발명을 실시예를 통하여 보다 구체적으로 설명한다. Hereinafter, the present invention will be described in more detail with reference to Examples.
[실시예]EXAMPLE
하기 표1와 같은 조성비를 가진 고로 출선구 폐쇄용 내화물의 조성물에 15중량%의 타-르를 외삽으로 가해 혼련하여 40x40x160mm의 크기로 성형한 후, 이 시편의 선변화율, 곡강도, 내침식성 및 개공성을 평가하고 그 결과를 나타내었다.
15 weight% of tar is extrapolated to the composition of the blast furnace closure refractories having the composition ratio as shown in Table 1 and kneaded to form a size of 40x40x160 mm, and then the linearity, bending strength, erosion resistance, and opening Siege was evaluated and the results are shown.
300℃ 및 1500℃에서의 선변화율과 소성강도를 측정하고, 내침식성은 고주파 유도용해로에서 고로 슬랙을 사용하여 1550℃에서 1시간 유지한 후 출선하여 시편의 잔존두께를 측정하였다. 개공성은 시편제조용 굴삭기(core boring machine)을 이용하여 일정한 시간에 굴삭되는 깊이를 측정하여 판단하였다. The rate of change and the plastic strength at 300 ° C and 1500 ° C were measured, and the erosion resistance was maintained at 1550 ° C for 1 hour using blast furnace slag in a high frequency induction furnace to measure the remaining thickness of the specimen. Openness was determined by measuring the depth to be excavated at a certain time using a core boring machine.
표 1에서 알 수 있는 바와 같이, 본 발명의 범위를 만족하는 발명예(1-5)는 비교예 (1-7)과 종래재와 비교하여 선변화율이 비교적 작고, 소성강도가 크고 내침식성 및 개공성이 우수함을 알 수 있었다.
As can be seen from Table 1, Inventive Example (1-5), which satisfies the scope of the present invention, has a relatively small line change rate, a large plastic strength, a high corrosion resistance, and a comparison with Comparative Example (1-7) and the conventional materials. It was found that the porosity was excellent.
상기한 바와 같이, 본 발명에 따른 고로 출선구 폐쇄용내화물은 내침식성이 우수한 고내식성 재질로서 개공시간이 단축되고 출선시간 연장 및 출선회수 저감에 유용한 효과가 있는 것이다.As described above, the blast furnace closure refractories according to the present invention is a highly corrosion resistant material having excellent corrosion resistance, which has a useful effect in shortening the opening time and extending the departure time and reducing the number of departure times.
Claims (1)
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| Application Number | Priority Date | Filing Date | Title |
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| KR1020010051230A KR100723131B1 (en) | 2001-08-24 | 2001-08-24 | Batch composition for taphole mix of blast furnace |
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| Application Number | Priority Date | Filing Date | Title |
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| KR1020010051230A KR100723131B1 (en) | 2001-08-24 | 2001-08-24 | Batch composition for taphole mix of blast furnace |
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| KR20030017100A KR20030017100A (en) | 2003-03-03 |
| KR100723131B1 true KR100723131B1 (en) | 2007-05-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101449184B1 (en) | 2012-12-21 | 2014-10-10 | 주식회사 포스코 | Batch Composition for Blast Furnace Tap Hole |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105174985A (en) * | 2015-11-03 | 2015-12-23 | 张婷 | Stable-taphole blast furnace stemming |
| CN109627027B (en) * | 2019-02-20 | 2022-02-01 | 中钢洛耐科技股份有限公司 | Aluminum-magnesium-iron-chromium spinel composite material and preparation method thereof |
| CN114195483B (en) * | 2021-12-03 | 2023-05-16 | 徐州宏阳新材料科技股份有限公司 | Repairing mass for submerged arc furnace and construction method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03279271A (en) * | 1990-03-29 | 1991-12-10 | Shinagawa Rozai Kk | Mud material for iron spout in blast furnace |
| JPH0672776A (en) * | 1992-08-24 | 1994-03-15 | Nippon Steel Corp | Refractory for casting mold |
| JPH0782046A (en) * | 1993-09-14 | 1995-03-28 | Nippon Steel Corp | Mud for tapping hole of blast furnace |
| JPH11199337A (en) * | 1997-12-29 | 1999-07-27 | Kawasaki Refract Co Ltd | Tapping hole-blocking material |
-
2001
- 2001-08-24 KR KR1020010051230A patent/KR100723131B1/en not_active IP Right Cessation
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03279271A (en) * | 1990-03-29 | 1991-12-10 | Shinagawa Rozai Kk | Mud material for iron spout in blast furnace |
| JPH0672776A (en) * | 1992-08-24 | 1994-03-15 | Nippon Steel Corp | Refractory for casting mold |
| JPH0782046A (en) * | 1993-09-14 | 1995-03-28 | Nippon Steel Corp | Mud for tapping hole of blast furnace |
| JPH11199337A (en) * | 1997-12-29 | 1999-07-27 | Kawasaki Refract Co Ltd | Tapping hole-blocking material |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101449184B1 (en) | 2012-12-21 | 2014-10-10 | 주식회사 포스코 | Batch Composition for Blast Furnace Tap Hole |
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| KR20030017100A (en) | 2003-03-03 |
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