KR100732447B1 - Recycling Method of Residual Castables for Teeming Ladle using Alumina cement and ladle slag - Google Patents
Recycling Method of Residual Castables for Teeming Ladle using Alumina cement and ladle slag Download PDFInfo
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- KR100732447B1 KR100732447B1 KR1020010029832A KR20010029832A KR100732447B1 KR 100732447 B1 KR100732447 B1 KR 100732447B1 KR 1020010029832 A KR1020010029832 A KR 1020010029832A KR 20010029832 A KR20010029832 A KR 20010029832A KR 100732447 B1 KR100732447 B1 KR 100732447B1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
- F27D1/1678—Increasing the durability of linings; Means for protecting
- F27D1/1684—Increasing the durability of linings; Means for protecting by a special coating applied to the lining
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
- F27D1/1678—Increasing the durability of linings; Means for protecting
- F27D1/1684—Increasing the durability of linings; Means for protecting by a special coating applied to the lining
- F27D2001/1689—Increasing the durability of linings; Means for protecting by a special coating applied to the lining obtained from materials added to the melt
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- General Engineering & Computer Science (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
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Abstract
알루미나 시멘트와 레이들 슬래그를 이용한 잔존 유입재 덧붙임 시공방법에 관한 것으로, 본 발명의 목적은 슬래그 코팅층의 내화도를 향상시키고 덧붙임 유입재와의 반응성을 극대화하여 사용중 박리탈락 방지 및 저융점 화합물 생성에 따른 잔존 유입재의 내화도 저하 최소화로 설비사고 가능성을 줄이며, 또한 덧붙임 시공을 수회 반복함으로써 잔존 유입재 재활용율을 향상시키는 것이다. 이를 위해 본 발명에 따른 알루미나 시멘트와 레이들 슬래그를 이용한 잔존 유입재 덧붙임 시공방법은, 레이들 수리 직후의 레이들에 턴디쉬 조업 직전에 알루미나 시멘트를 슬래그에 투입하여 레이들 슬래그와 알루미나 시멘트가 중량비로 5:1 ∼ 50:1 이 되도록 조절하고, 주조 중 탕면이 하향하면서 잔존 유입재에 슬래그 코팅층이 1∼10 mm 두께로 형성되도록 하여 주조완료후 상온으로 냉각시키고, 신규 유입재를 슬래그가 코팅된 잔존 유입재에 50∼70mm의 두께로 시공하고 통상의 조건인 1000℃∼1200℃로 예열하는 것을 특징으로 한다.The present invention relates to a method of adding a residual inflow material using alumina cement and ladle slag. The object of the present invention is to improve the fire resistance of the slag coating layer and maximize the reactivity with the addition inflow material, thereby preventing peeling off during use and producing a low melting point compound. It is possible to reduce the possibility of equipment accidents by minimizing the reduction of fire resistance of residual influents, and to improve the recycling rate of residual influents by repeating the additional construction several times. To this end, the method of adding the residual inflow material using the alumina cement and the ladle slag according to the present invention is to put the alumina cement into the slag immediately before the tundish operation to the ladle immediately after the ladle repair, so that the ladle slag and the alumina cement have a weight ratio. Furnace 5: 1 to 50: 1, and the slag coating layer is formed in the remaining inlet material with a thickness of 1 ~ 10 mm in the remaining inlet material while casting down, cooled to room temperature after casting is completed, and the new inlet material is coated with slag It is characterized in that it is constructed with a thickness of 50 to 70 mm on the remaining residual inflow material and preheated to 1000 ° C. to 1200 ° C. under normal conditions.
알루미나시멘트, 슬래그, 유입재, 덧붙임시공Alumina Cement, Slag, Infill, Addition
Description
본 발명은 레이들(ladle)용 잔존 유입재의 재활용 방법에 관한 것으로, 더욱 상세하게는 레이들 슬래그(slag)에 알루미나 시멘트를 혼합하여 슬래그를 개질한 후, 잔존 유입재의 표면에 코팅(coating)하여 신규 유입재를 덧붙임 시공하는 알루미나 시멘트와 레이들 슬래그를 이용한 잔존 유입재 재활용 방법에 관한 것이다.The present invention relates to a method for recycling residual inflow material for ladle, and more particularly, by mixing alumina cement with ladle slag to modify slag, and then coating the surface of the remaining inflow material. The present invention relates to a method for recycling residual input materials using alumina cement and ladle slag.
일반적으로 레이들용 유입재는 사용후 두께 50mm 이상이 잔존 유입재로 발생되는데, 종래에는 주로 브레이커(breaker)를 사용하여 이를 전량 폐기처분하였다.In general, the inflow material for ladle is generated as a residual inflow material more than 50mm after use, in the prior art was mainly discarded by using a breaker (breaker).
또한, 일본특허공개공보 JP9280746호에서와 같이 슬래그(slag)가 부착된 용융 금속용기의 내장 내화물을 보수하는 방법에 있어서, 부착 슬래그의 융점을 저하시키는 슬래그 개질재를 미리 내장 내화물의 표면에 도포한 후 부정형 내화물을 시공함으로써 용융 금속용기의 내장 내화물을 보수하는 방법도 있다.In addition, in the method for repairing the internal refractories of a molten metal container with slag as in Japanese Patent Application Laid-Open No. JP9280746, a slag modifier for lowering the melting point of the attached slag is applied to the surface of the internal refractories in advance. There is also a method for repairing the internal refractories of the molten metal container by constructing a post-shaped refractory.
그러나, 사용후 발생되는 잔존 유입재를 전량 폐기하는 방법은 폐기물의 발생량 및 신유입재의 시공량을 증가시키는 단점이 있으며, 일본특허공개공보 JP9280746호와 같은 방법은 개질재를 필요로 할 뿐만 아니라 개질재를 도포하는데 시간이 소요되므로 단가상승 및 시공시간 증가라는 단점이 있다.However, the method of discarding the total amount of residual influent generated after use has the disadvantage of increasing the amount of waste generated and the amount of new influent input, and methods such as Japanese Patent Application Laid-Open No. JP9280746 require not only reforming but also reforming. Since it takes time to apply the ash has the disadvantages of unit cost rise and construction time increase.
레이들용 잔존 유입재를 재활용하는 방법으로서, 용강배제 후에 발생되는 레이들 슬래그를 이용하여 노체경동을 통하여 잔존 유입재의 표면에 슬래그 코팅층을 5∼15mm 두께로 형성시킨 후 상온으로 냉각시키고, 신규유입재를 50~70mm 의 두께로 시공하고 통상의 조건인 1000℃ ~ 1200℃로 예열하는 잔존 유입재 덧붙임 시공방법이 있다. As a method of recycling the residual inflow material for ladle, by using the ladle slag generated after the molten steel removal slag coating layer formed on the surface of the residual inflow material to a thickness of 5 to 15mm through the furnace tilting, cooled to room temperature, new inflow There is a method of adding the remaining inflow material, which is constructed with a thickness of 50 to 70 mm and preheated to 1000 ° C. to 1200 ° C. under normal conditions.
그러나 이 방법에서는 슬래그의 조성 및 슬래그의 온도에 따라 잔존 유입재의 표면에 생성시키는 슬래그 코팅층의 두께가 의존하므로 목적하는 코팅재의 두께 확보가 용이하지 않고 소요시간이 길다는 단점이 있다.However, in this method, since the thickness of the slag coating layer to be formed on the surface of the remaining inflow material depends on the composition of the slag and the temperature of the slag, it is difficult to secure the thickness of the desired coating material and the required time is long.
또 다른 잔존 유입재 덧붙임 시공방법에서는 용강배제 후 발생되는 레이들 슬래그와 규석질 원료를 중량비로 50:1 ∼ 100:1 이 되도록 혼합한 후 노체경동을 통하여 잔존 유입재의 표면에 슬래그 코팅층을 3∼10mm 두께로 형성시켜 신규 유입재를 시공한다. In the method of adding additional residual inflow material, the ladle slag and the siliceous material generated after molten steel are mixed in a weight ratio of 50: 1 to 100: 1, and then the slag coating layer is coated on the surface of the remaining inflow material by furnace sloping. Form a 10mm thick new construction material.
그러나, 이 방법에서는 슬래그 코팅층에 CAS(CaO-Al2O3-SiO2)계 또는 CMS(CaO-MgO-SiO2)계 등의 저융점 화합물 형성에 의하여 내화도가 저하되어 사용중 덧붙임 유입재의 잔존이 작아지면 박리 탈락되거나 레이들의 대기 시간이 길어지면 잔존 유입재와 덧붙임 계면의 열팽창 계수의 차이에 의한 스폴링(spalling) 발생으로 신규 유입재의 박리 탈락이 초래되는 단점이 있다. However, in this method, the fire resistance decreases due to the formation of low melting point compounds such as CAS (CaO-Al 2 O 3 -SiO 2 ) or CMS (CaO-MgO-SiO 2 ) based on the slag coating layer. If it becomes smaller, the peeling drop-off or the waiting time of the ladle is long, there is a disadvantage that spalling occurs due to the difference in the thermal expansion coefficient of the remaining inflow material and the additive interface peeling off the new inflow material.
또한, 덧붙임 시공을 수회 반복할 경우, 슬래그 코팅층에 생성된 저융점 화합물이 잔존 유입재 내부로 확산되면서 잔존 유입재의 내화도 저하를 초래하여, 사용중 잔존 유입재 표면 노출시, 급격한 침식에 의한 용강 유출 등의 설비 사고 발생 위험성이 있으므로 반복하여 덧붙임 시공을 할 수 없는 단점이 있다.In addition, if the repeated construction is repeated several times, the low melting point compound generated in the slag coating layer is diffused into the residual inflow material, causing a decrease in the fire resistance of the remaining inflow material. Because there is a risk of equipment accidents, there is a disadvantage that can not be added repeatedly.
이에 본 발명은 상기와 같은 단점을 극복하기 위하여 안출된 것으로, 슬래그 코팅층의 내화도를 향상시키고 덧붙임 유입재와의 반응성을 극대화하여 사용중 박리탈락 방지 및 저융점 화합물 생성에 따른 잔존 유입재의 내화도 저하 최소화로 설비사고 가능성을 줄여 안정조업을 도모하는 데 그 목적이 있다.Therefore, the present invention was devised to overcome the above disadvantages, and to improve the fire resistance of the slag coating layer and to maximize the reactivity with the additive inflow material to prevent peeling off during use and to minimize the fire resistance reduction of the remaining inflow material due to the production of low melting point compounds. The purpose is to reduce the possibility of equipment accidents and promote stable operation.
본 발명의 또 다른 목적은, 덧붙임 시공을 수회 반복함으로써 잔존 유입재의 재활용율을 향상시키는 방법을 제공하는 것이다.Still another object of the present invention is to provide a method of improving the recycling rate of residual influent by repeating the addition process several times.
상기한 바와 같은 목적을 달성하기 위한 본 발명의 알루미나 시멘트와 레이들 슬래그를 이용한 잔존 유입재 덧붙임 시공방법은, 레이들 수리 직후의 레이들에 턴디쉬 조업 직전에 알루미나 시멘트를 슬래그에 투입하여 레이들 슬래그와 알루미나 시멘트가 중량비로 5:1 ∼ 50:1 이 되도록 조절하고 주조 중 탕면이 하향하면서 잔존 유입재에 슬래그 코팅층이 1∼10 mm 두께로 형성되도록 하여 주조완료후 상온으로 냉각시키고 신규 유입재를 슬래그가 코팅된 잔존 유입재에 50∼70mm의 두께로 시공하고 통상의 조건인 1000℃∼1200℃로 예열하는 것을 특징으로 한다.Residual inflow material addition construction method using the alumina cement and ladle slag of the present invention for achieving the object as described above, the alumina cement in the ladle immediately before the tundish operation to the ladle immediately after repairing the ladle by ladle The slag and alumina cement are adjusted to be 5: 1 to 50: 1 in weight ratio, and the slag coating layer is formed to a thickness of 1 to 10 mm in the remaining inflow material while the hot water surface is down during casting, and then cooled to room temperature after completion of casting. It is characterized in that the slag is coated in the remaining inlet material with a thickness of 50 to 70mm and preheated to 1000 ℃ to 1200 ℃ normal conditions.
본 발명에서 레이들 슬래그와 혼합되는 알루미나 시멘트 원료는 레이들 슬래 그와 알루미나 시멘트가 중량비로 5:1 ∼ 50:1 이어야 하는 이유는 다음과 같다. 혼합비가 5:1 미만이면 슬래그 코팅재의 점도가 급격히 증가되어 유동성이 저하되므로 잔존 유입재의 표면에 슬래그 코팅층 두께 제어가 곤란한 문제를 야기시키며, 혼합비가 50:1을 초과하면 슬래그의 점도가 부족하여 1mm 이상의 슬래그 코팅층이 형성되지 않으므로 잔존 유입재와 신규 유입재의 접착계면력이 저하되어 사용시 접착면으로 지금이 침투하여 신규 유입재의 탈락을 유발시키기 때문이다. In the present invention, the alumina cement material mixed with the ladle slag is ladle slag and the alumina cement should be in a weight ratio of 5: 1 to 50: 1 as follows. If the mixing ratio is less than 5: 1, the viscosity of the slag coating material is rapidly increased and the fluidity is lowered. Therefore, it is difficult to control the thickness of the slag coating layer on the surface of the remaining inflow material.If the mixing ratio is more than 50: 1, the slag viscosity is insufficient and 1 mm. Since the above slag coating layer is not formed, the adhesion interfacial force between the remaining inflow material and the new inflow material is lowered, so that the current infiltrates into the adhesive surface and causes the dropping of the new inflow material.
슬래그 코팅은 주조 중 탕면이 하향하면서 이루어져 코팅층을 형성하며, 잔존 유입재의 표면에 슬래그 코팅층을 1~10mm 두께로 형성시킨 후 상온으로 냉각시키고, 신규유입재를 50~70mm 의 두께로 시공하고 통상의 조건인 1000℃~1200℃로 예열하여 시공하게 된다.The slag coating forms a coating layer with the hot water face down during casting, and forms a slag coating layer on the surface of the remaining inflow material to a thickness of 1 to 10 mm, then cools it to room temperature, and constructs a new inflow material to a thickness of 50 to 70 mm. Preheating is performed at 1000 ° C. to 1200 ° C., which is a condition.
본 발명에서는 유입재 및 레이들 슬래그의 조성으로서 특별히 한정하는 것은 없으며, 통상의 레이들용 유입재 및 레이들 슬래그를 사용하여도 무방하다.In the present invention, the composition of the inflow material and ladle slag is not particularly limited, and an ordinary inflow material for ladle and ladle slag may be used.
본 발명에서 잔존유입재의 표면에 형성되는 슬래그 코팅층의 두께가 1~10mm 이어야 하는 이유는 다음과 같다. 슬래그 코팅층의 두께가 1mm 미만이면 잔존 유입재와 신규 유입재의 접착계면력이 미약하여 사용시에 잔존 유입재와 신규 유입재의 접촉면을 통하여 지금이 침투되어 신규 유입재가 탈락을 초래하며, 슬래그 코팅층의 두께가 10mm을 초과하면 잔존 유입재와 신규 유입재의 경계면에 생성되는 접착층의 내화도가 미약하여 경계면이 용강에 노출시 급격한 내용성의 저하를 초래하기 때문이다.The reason why the thickness of the slag coating layer formed on the surface of the residual inflow material in the present invention should be 1 to 10 mm is as follows. If the thickness of the slag coating layer is less than 1mm, the adhesive interfacial force between the remaining inflow material and the new inflow material is weak, and the new inflow material penetrates through the contact surface between the remaining inflow material and the new inflow material. This is because if the thickness exceeds 10 mm, the fire resistance of the adhesive layer formed on the interface between the remaining inflow material and the new inflow material is weak, resulting in a rapid decrease in the contents when the interface is exposed to molten steel.
본 발명에서 신규 유입재의 시공두께가 50~70mm이어야 하는 이유는 다음과 같다. 시공두께가 50mm 미만이면 슬래그 코팅층에 의한 신규 유입재의 변질층 두께의 증가로 내용성이 저하되며, 70mm 을 초과하면 예열시 열전달의 미약으로 잔존 유입재와 신규 유입재의 접착계면력이 저하되므로 잔존 유입재와 신규 유입재의 계면으로 지금이 침투되어 신규 유입재의 탈락을 초래하기 때문이다.The reason why the construction thickness of the new inflow material in the present invention should be 50 to 70 mm is as follows. If the construction thickness is less than 50mm, the solvent resistance decreases due to the increase in the thickness of the deteriorated layer of the new inflow material by the slag coating layer. If the thickness exceeds 70mm, the residual inflow material and the new inflow material have poor adhesion due to weak heat transfer. This is because the current penetrates into the interface between the ash and the new inflow, resulting in the dropout of the new inflow.
본 발명에서는 예열조건으로 특별히 한정하는 것은 없으며, 용강수강시 열적 스폴링(spalling)의 발생을 방지하기 위하여 통상적으로 사용하는 예열조건인 1000℃에서 1200℃면 충분하다.In the present invention, there is no particular limitation to the preheating condition, and it is sufficient that 1200 ° C to 1200 ° C, which is a preheating condition commonly used to prevent the occurrence of thermal spalling during molten steel, is sufficient.
이하, 실시예를 통하여 본 발명을 상세히 설명한다.Hereinafter, the present invention will be described in detail through examples.
실시예 1 내지 4에서는 260ch 사용후 잔존 두께가 평균 50mm인 300톤 용량의 레이들에 턴디쉬 조업직전에 알루미나 시멘트를 슬래그에 투입하여 레이들 슬래그와 알루미나 시멘트가 중량비로 각각 5:1, 50:1, 20:1, 20:1 이 되도록 조절하고, 주종 중 탕면이 하향하면서 잔존 유입재에 슬래그 코팅층을 각각 10, 1, 5, 8 mm 두께로 형성되도록 하여 주조완료 후 상온으로 냉각시켰다.In Examples 1 to 4, alumina cement was added to slag immediately before the tundish operation in a ladle of 300 tons having an average thickness of 50 mm after using 260 ch, and ladle slag and alumina cement were 5: 1 and 50: 1, 20: 1, 20: 1 was adjusted, and the slag coating layer was formed in the remaining inflow material while the hot water face of the main bell downwards to form a thickness of 10, 1, 5, 8 mm, respectively, and cooled to room temperature after completion of casting.
레이들의 냉각이 완료된 후에 통상의 알루미나-마그네시아질 유입재를 각각 60, 60, 50, 70 mm의 두께로 시공하고 1100℃로 예열하여 120ch까지 사용하였다.After the cooling of the ladle was completed, the usual alumina-magnesia inlet was applied to a thickness of 60, 60, 50, and 70 mm, respectively, preheated to 1100 ° C., and used up to 120 ch.
120ch 사용 후 신규 유입재의 잔존두께를 측정하고, 코팅층 형성 상태 및 60ch 사용 후 잔존 유입재와 신규 유입재 계면으로의 지금침투 여부를 관찰하였으며, 그 결과를 표 1에 나타내었다. After the use of 120ch, the residual thickness of the new inflow material was measured, and the coating layer formation state and whether the current penetration into the interface between the remaining inflow material and the new inflow material after using 60ch were observed, and the results are shown in Table 1.
또한, 슬래그와 알루미나 시멘트의 혼합비, 슬래그 코팅층의 두께 및 신규 유입재의 시공두께가 실시예의 범위에서 벗어난 범위에서 비교예 1~4를 수행하였으 며, 그 결과를 표 1에 함께 나타내었다. In addition, Comparative Examples 1 to 4 were carried out in a range in which the mixing ratio of the slag and the alumina cement, the thickness of the slag coating layer, and the construction thickness of the new inflow material were outside the range of the examples, and the results are shown in Table 1 together.
표 1에 나타난 바와 같이, 실시예 1~4에서는 본 발명의 목적이 달성되었으나, 본 발명의 범위를 벗어난 비교예 1~4에서는 코팅층의 제어가 곤란하거나 신규유입재의 지금침투로 인한 탈락 등이 발생되었다. As shown in Table 1, in Examples 1 to 4, the object of the present invention was achieved, in Comparative Examples 1 to 4 outside the scope of the present invention, it is difficult to control the coating layer or dropout due to the current penetration of the new inflow material. It became.
또한, 조업안정을 위한 레이들의 대기시간에 따른 영향을 본 발명의 실시예 1과 종래의 공지기술과를 비교하여 표 2에 나타내었다. In addition, the effect of the ladle waiting time for the operation stability is shown in Table 2 in comparison with Example 1 of the present invention and the conventional known technology.
표 2에 나타난 바와 같이, 본 발명의 실시예1은 통상의 레이들의 ch당 대기시간인 100분을 경과하여도 120ch 사용시까지 덧붙임 유입재의 박리탈락이 발생되지 않았으나, 규석질을 사용하여 슬래그를 개질한 종래의 공지기술에서는 30ch 사용시점에서 덧붙임 유입재의 스폴링에 의한 대형 탈락현상이 발생하여 60ch 이상에서는 덧붙임 유입재의 잔존이 모두 소멸하였다. As shown in Table 2, in Example 1 of the present invention, even after 100 minutes of waiting time per ch of ladle, peeling dropping of the inflow material did not occur until the use of 120ch, but the slag was reformed using silica. In the related art, a large dropout phenomenon occurs due to spalling of the additive inflow material at the time of use of 30ch, and all of the residuals of the additional inflow material disappeared at 60ch or more.
또한, 본 발명에 의한 잔존 유입재의 슬래그 개질층과 종래의 공지기술에 의한 잔존 유입재의 슬래그 개질층을 수거하여 1650℃에서 레이들 슬래그 및 용강에 의하여 1시간 동안 회전침식시험을 실시하여 내식성을 평가한 결과를 표 3에 나타내었다. In addition, the slag reformed layer of the residual inflow material according to the present invention and the slag reformed layer of the remaining inflow material according to the conventional known art is collected and subjected to a rotary erosion test for 1 hour by ladle slag and molten steel at 1650 ℃ to evaluate the corrosion resistance One result is shown in Table 3.
표 3에서 침식지수는 실시예 1을 100으로 했을 경우의 비교지수로서, 이에 나타난 바와 같이, 본 발명의 실시예1에 비해 종래의 공지기술의 내식성이 700 및 500으로서 급격히 저하되었음을 알 수 있었다. In Table 3, the erosion index is a comparative index when Example 1 is set to 100. As shown in FIG. 3, it was found that the corrosion resistance of the conventional publicly known technologies is rapidly lowered to 700 and 500 as compared to Example 1 of the present invention.
이상 설명한 바와 같은 본 발명에 따른 잔존 유입재 덧붙임 시공방법에 의하면, 잔존 유입재를 재활용하므로 폐기물 저감에 기여하는 효과가 있다.According to the method for adding the residual inflow material according to the present invention as described above, the residual inflow material is recycled, thereby contributing to waste reduction.
또한, 슬래그 코팅층의 내화도를 향상시키고 덧붙임 유입재와의 반응성을 극대화시킴으로써 사용중 박리탈락이 방지되는 효과가 있고, 저융점 화합물 생성에 따른 잔존 유입재의 내화도 저하를 최소화하는 효과가 있으며, 이로 인해 설비사고 가능성을 줄이고 안정조업을 수행하는 효과가 있다.In addition, by improving the fire resistance of the slag coating layer and maximizing the reactivity with the additive inlet material, there is an effect of preventing the peeling off during use, and the effect of minimizing the reduction of the fire resistance of the remaining inlet material due to the production of low melting point compounds, thereby causing equipment accidents It has the effect of reducing the possibility and performing stable operations.
그리고, 덧붙임 시공을 수회 반복함으로써 잔존 유입재 재활용율을 향상시키는 효과가 있다.And, by repeating the addition several times, there is an effect of improving the recycling rate of the remaining influent.
Claims (4)
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Citations (6)
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|---|---|---|---|---|
| JPS5518557A (en) * | 1978-07-25 | 1980-02-08 | Nippon Steel Corp | Ladle for carrying molten slag |
| JPH0926268A (en) * | 1995-07-10 | 1997-01-28 | Kawasaki Steel Corp | Method for reducing initial wear of slag line part for molten steel ladle lining |
| JPH09280746A (en) * | 1996-04-17 | 1997-10-31 | Nippon Steel Corp | Method for repairing lining refractory of molten metal container |
| JPH10139555A (en) * | 1996-11-08 | 1998-05-26 | Shinagawa Refract Co Ltd | Monolithic refractories for lining secondary refining ladle |
| KR20020050985A (en) * | 2000-12-22 | 2002-06-28 | 신현준 | Recycling Method of Residual Castables for Teeming Ladle |
| JP2002234776A (en) * | 2001-02-01 | 2002-08-23 | Shinagawa Refract Co Ltd | Monolithic refractory composition for molten steel ladle |
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2001
- 2001-05-29 KR KR1020010029832A patent/KR100732447B1/en not_active IP Right Cessation
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5518557A (en) * | 1978-07-25 | 1980-02-08 | Nippon Steel Corp | Ladle for carrying molten slag |
| JPH0926268A (en) * | 1995-07-10 | 1997-01-28 | Kawasaki Steel Corp | Method for reducing initial wear of slag line part for molten steel ladle lining |
| JPH09280746A (en) * | 1996-04-17 | 1997-10-31 | Nippon Steel Corp | Method for repairing lining refractory of molten metal container |
| JPH10139555A (en) * | 1996-11-08 | 1998-05-26 | Shinagawa Refract Co Ltd | Monolithic refractories for lining secondary refining ladle |
| KR20020050985A (en) * | 2000-12-22 | 2002-06-28 | 신현준 | Recycling Method of Residual Castables for Teeming Ladle |
| KR100515601B1 (en) * | 2000-12-22 | 2005-09-16 | 재단법인 포항산업과학연구원 | Recycling Method of Residual Castables for Teeming Ladle |
| JP2002234776A (en) * | 2001-02-01 | 2002-08-23 | Shinagawa Refract Co Ltd | Monolithic refractory composition for molten steel ladle |
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