KR100475696B1 - A slag making material made of waste firebrick and its manufacturing process - Google Patents
A slag making material made of waste firebrick and its manufacturing process Download PDFInfo
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- KR100475696B1 KR100475696B1 KR10-2003-0023211A KR20030023211A KR100475696B1 KR 100475696 B1 KR100475696 B1 KR 100475696B1 KR 20030023211 A KR20030023211 A KR 20030023211A KR 100475696 B1 KR100475696 B1 KR 100475696B1
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/16—Waste materials; Refuse from building or ceramic industry
- C04B18/165—Ceramic waste
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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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/26—Carbonates
- C04B14/28—Carbonates of calcium
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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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/30—Oxides other than silica
- C04B14/304—Magnesia
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/0076—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials characterised by the grain distribution
- C04B20/008—Micro- or nanosized fillers, e.g. micronised fillers with particle size smaller than that of the hydraulic binder
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/026—Comminuting, e.g. by grinding or breaking; Defibrillating fibres other than asbestos
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Ceramic Engineering (AREA)
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- Civil Engineering (AREA)
- Dispersion Chemistry (AREA)
- Nanotechnology (AREA)
- Environmental & Geological Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
본 발명은 용선에 함유된 불순물을 슬래그와 접촉시켜 제거하기 위해 용선에 투여되는 슬래그 조제재 및 그 제조방법에 관한 것으로, 상세하게는 폐기되는 내화벽돌을 일정크기의 입자나 분말상으로 재가공하여 제강공정에서 첨가되는 슬래그 조제재로 사용함으로써, 폐기물의 재활용 효과와 더불어 제강공정에서의 전기료 절감등의 생산성 향상의 효과를 가져오는 폐내화벽돌을 이용한 슬래그 조제재 및 그 제조방법에 관한 것이다.The present invention relates to a slag preparation to be administered to molten iron in order to remove the impurities contained in the molten iron in contact with the slag, and to a method of manufacturing the same. The present invention relates to a slag preparation using waste refractory bricks and a method of manufacturing the same, which are used as a slag preparation added in the present invention, which leads to an effect of recycling waste and productivity improvement such as saving of electricity in the steelmaking process.
본 발명에 따르면, 폐기되는 내화벽돌 중에서 알루미나질내화벽돌 또는 마그네시아질내화벽돌을 선별하여 1차 분쇄하는 공정과; 분쇄된 폐내화벽돌 60~80중량％와 생석회(CaO) 15~20중량％와 마그네시아(MgO) 5~15중량％의 비율로 혼합하는 공정과; 상기 혼합물을 입도 40mm이하가 되도록 2차 분쇄하는 공정과; 상기 혼합물을 입상물과 분상물로 구별하여 각각 따로 포장하는 공정;을 포함한 폐내화벽돌을 이용한 슬래그 조제재의 제조방법 및 이에 의해 제조된 슬래그 조제재가 제공된다.According to the present invention, a step of firstly pulverizing the alumina refractory brick or magnesia refractory brick from the refractory bricks discarded; Mixing 60 to 80% by weight of the crushed waste refractory brick, 15 to 20% by weight of quicklime (CaO) and 5 to 15% by weight of magnesia (MgO); Secondary grinding the mixture to a particle size of 40 mm or less; There is provided a method for producing a slag preparation using waste refractory bricks, and a slag preparation prepared therefrom, including the steps of separately dividing the mixture into granular materials and powdery products.
Description
본 발명은 용선에 함유된 불순물을 슬래그와 접촉시켜 제거하기 위해 용선에 투여되는 슬래그 조제재 및 그 제조방법에 관한 것으로, 상세하게는 폐기되는 내화벽돌을 일정크기의 입자나 분말상으로 재가공하여 제강공정에서 첨가되는 슬래그 조제재로 사용함으로써, 폐기물의 재활용 효과와 더불어 제강공정에서의 전기료 절감등의 생산성 향상의 효과를 가져오는 폐내화벽돌을 이용한 슬래그 조제재 및 그 제조방법에 관한 것이다.The present invention relates to a slag preparation to be administered to molten iron in order to remove the impurities contained in the molten iron in contact with the slag, and to a method of manufacturing the same. The present invention relates to a slag preparation using waste refractory bricks and a method of manufacturing the same, which are used as a slag preparation added in the present invention, which leads to an effect of recycling waste and productivity improvement such as saving of electricity in the steelmaking process.
제강공정은 쇳물에서 불순물을 제거해 강철로 만드는 공정이다. 고로에서 생산된 쇳물에는 탄소(C) 함유량이 많고, 인(P), 유황(S)과 같은 불순물이 다량 포함되어 있는데 이 쇳물을 용선이라 한다. 전로에 상기의 용선과 고철을 함께 넣은 후 순수한 산소를 불어 넣어 불순물인 인(P)이나 유황(S), 탄소(C) 성분을 걸러주는데, 이렇게 불순물을 제거한 깨끗한 쇳물을 용강이라고 한다.Steelmaking is the process of removing impurities from water to make steel. The molten iron produced in the blast furnace is high in carbon and contains a large amount of impurities such as phosphorus (P) and sulfur (S). This molten iron is called molten iron. After the molten iron and the scrap iron are put together in the converter, pure oxygen is blown to filter out impurities such as phosphorus (P), sulfur (S), and carbon (C). The clean water from which impurities are removed is called molten steel.
이와 같은 용융상태의 용선에 포함된 인(P), 유황(S) 등의 불순물과, 탈산과정에서 생성되는 비금속물은 강의 품질과 기계적 성질을 저하시키기 때문에 일정 수준 이하로 제거해 주어야 한다. 상기의 불순물은 용선이 슬래그와 접촉됨으로써 제거되는데, 슬래그의 생성을 위해 용선에 첨가되는 것이 슬래그 조제재이다. Impurities such as phosphorus (P) and sulfur (S) in the molten molten iron in this molten state, and non-metallic materials generated during the deoxidation process should be removed below a certain level because they degrade the quality and mechanical properties of the steel. The above impurity is removed by the molten iron contacting the slag, the slag preparation is added to the molten iron for the production of slag.
통상의 슬래그 조제재는 생석회(CaO)나 마그네시아(MgO)가 사용되고 있다. 상기의 조제재의 역할은 용강으로 만들기 위한 탈인작용과, 로벽연와를 보호하는 작용과, 슬래그 포밍(slag foaming)작업을 극대화시키는 작용을 한다. 따라서, 철 이외의 불순물을 제거하기 위해 첨가한 생석회가 불순물과 반응해 철 위에 부유하는 것이 슬래그이다. 따라서 슬래그는 다양한 불순물을 함유한 상태로 비중차에 의해 철과 분리되고, 부유된 슬래그는 냉각되어 처리된다.As a conventional slag preparation, quicklime (CaO) and magnesia (MgO) are used. The role of the preparation agent serves to dephosphorize the molten steel, protect the furnace wall and maximize the slag foaming. Therefore, slag is the quicklime added to remove impurities other than iron and reacts with impurities to float on iron. Therefore, slag is separated from iron by specific gravity in the state containing various impurities, and the suspended slag is cooled and processed.
그러나, 상기와 같은 통상의 제강공정은 첨가되는 생석회(CaO)에 의해 용해 속도가 저하되어 전기료가 증가되고, 슬래그 응집 효과가 미미한 문제점이 있다.However, the conventional steelmaking process as described above has a problem that the dissolution rate is lowered by the added quicklime (CaO), the electric charge is increased, and the slag aggregation effect is insignificant.
그리고, 폐기되는 여러 종류의 내화벽돌은 별도의 재활용 용도를 찾기 어려워 산업 폐기물로서 환경오염이나 처리 비용에서 많은 문제점을 가지고 있으나, 그 원료가 슬래그 조제재로 사용하기에 적합한 것임에 착안하여 그 활용 방안이 가능하게 된다. 즉, 내화벽돌은 주원료의 종류에 따라 규석벽돌, 점토질벽돌, 고알루미나벽돌, 크롬-마그네시아벽돌, 마그네시아질벽돌 등이 있는데, 이중 슬래그 조제재로 재활용하기에 좋은 폐내화벽돌은 알루미나질벽돌과 마그네시아질벽돌이다.In addition, various types of fire bricks to be discarded have many problems in environmental pollution or disposal costs as industrial wastes because it is difficult to find a separate recycling use, but the method is considered that the raw materials are suitable for use as a slag preparation. This becomes possible. In other words, refractory bricks include silica bricks, clay bricks, high alumina bricks, chrome-magnesia bricks, and magnesia bricks, depending on the type of main raw materials.Aluminum bricks and magnesia which are good for recycling with double slag preparation It is a quality brick.
본 발명의 목적은 높은 처리비용으로 폐기되는 내화벽돌을 선별하여 슬래그 조제재로 재활용하고, 용선에 포함된 불순물을 제거하여 철강의 품질을 향상시킬 수 있도록 폐내화벽돌을 이용한 슬래그 조제재 및 그 제조방법을 제공함에 있다. An object of the present invention is to select a refractory brick that is discarded at a high processing cost and recycle it as a slag preparation material, and to manufacture the slag preparation material using waste refractory brick to remove the impurities contained in the molten iron to improve the quality of steel. In providing a method.
폐내화벽돌을 이용하여 슬래그 조제재로 재활용하는 방법은 폐기되는 내화벽돌 중에서 알루미나질내화벽돌 또는 마그네시아질내화벽돌을 선별하여 1차 분쇄하는 공정과; 분쇄된 폐내화벽돌 60~80중량％와 생석회(CaO) 15~25중량％와 마그네시아(MgO) 5~15중량％의 비율로 혼합하는 공정과; 상기 혼합물을 입도 40mm이하가 되도록 2차 분쇄하는 공정과; 상기 혼합물을 입상물과 분상물로 구별하여 각각 따로 포장하는 공정;을 포함함을 특징으로 한다.A method of recycling waste slab using slag preparation includes the steps of: firstly crushing alumina refractory bricks or magnesia refractory bricks from the refractory bricks discarded; Mixing 60 to 80% by weight of pulverized refractory bricks, 15 to 25% by weight of quicklime (CaO), and 5 to 15% by weight of magnesia (MgO); Secondary grinding the mixture to a particle size of 40 mm or less; Characterized in that it comprises a; step of separately packaging the mixture into a granular material and a powder.
상기의 공정으로 제조된 폐내화벽돌을 이용한 슬래그 조제재는 융점 1200~1300℃, 비중 2.5~3.5, 밀도 1.4~1.7g/㎤의 특징을 가지며, 선별되어 사용된 내화벽돌별로 다음과 같은 중량％ 범위의 혼합비를 가진다.The slag preparation using waste fire brick manufactured by the above process has the characteristics of melting point 1200 ~ 1300 ℃, specific gravity 2.5 ~ 3.5, density 1.4 ~ 1.7g / cm3, and the following weight% range for each refractory brick used. It has a mixing ratio of.
상기와 같은 본 발명의 슬래그 조제재를 제조하는 방법은 폐기되는 내화벽돌을 재활용하여 얻어지는 것으로, 내화벽돌은 주원료의 종류에 따라 규석벽돌, 점토질벽돌, 고알루미나벽돌, 크롬-마그네시아벽돌, 마그네시아질벽돌 등이 있는데, 이중 슬래그 조제재로 재활용하기에 좋은 폐내화벽돌은 알루미나질내화벽돌과 마그네시아질내화벽돌이다The method for producing the slag preparation of the present invention as described above is obtained by recycling the refractory bricks to be discarded, the refractory bricks are silica brick, clay brick, high alumina brick, chromium-magnesia brick, magnesia brick according to the type of main raw material Waste fire bricks, which are good for recycling as a double slag preparation, are alumina fire bricks and magnesia fire bricks.
따라서, 본 발명의 1공정은 폐기되는 알루미나질벽돌 또는 마그네시아질벽돌을 죠 크래셔(jaw crusher)와 같은 분쇄기로 1차 분쇄하게 된다. 내화벽돌의 규격은 보통 230 ×114 ×65mm 정도이므로 슬래그 조제재로 재가공하기 위해서는 분쇄할 필요성이 있다.Therefore, one step of the present invention is to first crush the alumina brick or magnesia brick that is discarded with a grinder such as a jaw crusher. Refractory bricks are usually about 230 × 114 × 65 mm, so they need to be pulverized in order to be reprocessed into slag preparations.
2공정은 상기와 같이 조립자로 분쇄된 폐내화벽돌에 분쇄된 폐내화벽돌 60~80중량％와 생석회(CaO) 15~25중량％와 마그네시아(MgO) 5~15중량％의 비율로 혼합하는 공정으로서, 슬래그 생성을 촉진시키기 위해 생석회(CaO)와 마그네시아(MgO)를 첨가하는 공정이다.Step 2 is a step of mixing 60 ~ 80% by weight of the fire refractory bricks, 15-25% by weight of quicklime (CaO) and 5 to 15% by weight of magnesia (MgO) crushed in the waste fire bricks pulverized by the granulator as described above As an example, quick lime (CaO) and magnesia (MgO) are added to promote slag formation.
따라서, 생석회(CaO)와 마그네시아(MgO)의 첨가는 탈인작업을 비롯하여 불순물의 제거와 로벽연와 보호를 확실히 수행할 수 있게 되고, 융점이 낮추어 에너지를 절약할 수 있게 되며, 슬래그의 응집 효과가 증대된다. 뿐만 아니라 조제재의 배합조절이 용이하게 된다.Therefore, the addition of quicklime (CaO) and magnesia (MgO) makes it possible to reliably remove impurities, remove furnace edges and protect, defrost, save energy by lowering melting point, and increase the coagulation effect of slag. do. In addition, it is easy to adjust the formulation of the preparation.
3공정은 상기의 혼합물을 2차 분쇄하는 공정으로서, 슬래그 조제재로써 전로에 투입하는 적정크기인 입도 40mm이하로 재차 분쇄하여 미립자로 만드는 공정이다.The third step is a step of secondly crushing the mixture, and is a step of pulverizing the mixture again to a particle size of 40 mm or less, which is an appropriate size to be introduced into the converter as a slag preparation material.
4공정은 입상물과 분상물로 구별하여 각각 따로 포장하는 공정으로서, 사용자의 선호도나 제강공정 등의 제반 조건에 따라 슬래그 조제재의 형상이 달라질 수 있는데, 이를 위해 본 발명에서는 입상물과 분상물로 구별하게 된다. 즉, 2차 분쇄까지 마치게 되면 40mm이하의 입상물과 분상물이 발생하게 되고, 이를 스크린으로 걸러 구분하며, 각각 따로 포장하게 된다.Step 4 is a process of separately packaging the granular material and the powdered product, and the shape of the slag preparation material may vary according to the user's preference or various conditions such as steelmaking process. It is distinguished by. That is, when the second grinding is finished, granular matter and powdery matter of 40 mm or less are generated, and separated by a screen, and separately packed.
이와같이 본 발명에 의해 제조된 슬래그 조제재는 제강공정에서 다음과 같은 역할을 하게 된다.Thus, the slag preparation produced by the present invention plays the following role in the steelmaking process.
우선 탈인작용으로서, 용선이나 용강의 인(P)은 산소 및 슬래그 중의 산화철(FeO)등과 반응하여 인산(P2O5)으로 되어 제거된다. 즉, 2P ×5O = P2O 5의 화학반응식을 가진다.First, as dephosphorization, phosphorus (P) in molten iron or molten steel reacts with oxygen and iron oxide (FeO) in slag to form phosphoric acid (P 2 O 5 ) and is removed. That is, it has a chemical reaction of 2P × 5O = P 2 O 5 .
상기와 같은 종래의 탈인 반응은 제강온도에서 매우 불안정한 상태가 되고 강한 산성을 띠기 때문에 역반응도 쉽게 일어나 효과적인 탈인 작용을 할 수 없는 문제점이 있다. 따라서, 염기성 물질로 인산(P2O5)를 안정된 형태로 고정시켜 활동도를 낮출 필요가 있다.The conventional dephosphorization reaction is a very unstable state at the steelmaking temperature and has a strong acidity, so there is a problem in that reverse reaction occurs easily and does not perform effective dephosphorization. Therefore, it is necessary to lower the activity by fixing phosphoric acid (P 2 O 5 ) in a stable form with a basic substance.
본 발명에 의해 조제된 폐내화벽돌을 이용한 슬래그 조제재로 탈인작용을 하는 경우는 염기성의 생석회(CaO)가 인산(P2O5)과 결합됨으로써 안정되게 탈인작용을 할 수 있게 된다. 즉, 3CaO ×2P ×5O = 3CaO(P2O5) 또는 4CaO ×2P ×5O = 4CaO(P2O5)의 화학반응식에서와 같이 종래에 비해 용이하게 진행된다. 따라서, 생석회(CaO)의 함량이 많을수록, 온도가 낮을수록, 슬래그 중의 인산(P2O5)이 낮을수록 탈인작업이 잘 진행된다. 이는 본 발명에 의한 슬래그 조제재가 융점을 낮추어주므로 에너지 절약은 물론이고 상기와 같은 이유에서 탈인작용을 좋게 한다.In the case of dephosphorization by slag preparation using the waste refractory brick prepared according to the present invention, basic quicklime (CaO) is combined with phosphoric acid (P 2 O 5 ) to be able to stably dephosphorize. That is, as in the chemical reaction of 3CaO x 2P x 5O = 3CaO (P 2 O 5 ) or 4CaO x 2P x 5O = 4CaO (P 2 O 5 ), it proceeds more easily than in the prior art. Therefore, the higher the content of quicklime (CaO), the lower the temperature, and the lower the phosphoric acid (P 2 O 5 ) in the slag, the better the dephosphorization work. This is because slag preparation according to the present invention lowers the melting point, as well as energy saving and dephosphorization for the same reason as described above.
그리고, 로벽연와를 보호하는 작용을 하는데, 아크 노출에 따른 로벽연와의 손상을 최소화하기 위해서는 슬래그 층으로 보호하는데, 마그네시아(MgO)와 생석회(CaO)가 로벽연와(MgO-C)의 침식을 방지하게 된다. 슬래그 염기도(CaO/SlO2)가 약 2.1일 때 슬래그 뎁스(depth)가 최대치를 나타내고 이는 슬래그 내의 생석회(CaO)와 규산(SlO2)량의 조성에 기인한다. 따라서 본 발명은 조재재 배합조절의 용이함에 특징이 있어 상기의 로벽연와를 보호하기에 적정한 슬래그를 형성하는 조제재의 제조가 용이하게 된다.And, to protect the furnace wall smoke, in order to minimize the damage of the furnace wall smoke due to the exposure of the arc to protect with a slag layer, magnesia (MgO) and quicklime (CaO) to prevent the erosion of the furnace wall (MgO-C) Done. When the slag basicity (CaO / SlO 2 ) is about 2.1, the slag depth shows the maximum value, which is due to the composition of the amount of quicklime (CaO) and silicic acid (SlO 2 ) in the slag. Therefore, the present invention is characterized in that it is easy to adjust the formulation mix, it is easy to manufacture a preparation to form a slag suitable for protecting the furnace wall edge.
이와같이 본 발명은 폐기되는 내화벽돌을 재활용할 수 있는 효과가 있고, 적정비율로 첨가된 생석회(CaO)와 마그네시아(MgO)에 의해 제강공정에서의 탈인작용을 좋게 하고 로벽연와를 양호하게 보호할 수 있으며 융점의 저하가 가능하여 에너지 절약의 효과가 있다.In this way, the present invention has the effect of recycling the refractory bricks discarded, it is possible to improve the dephosphorization in the steelmaking process by the quick-lime (CaO) and magnesia (MgO) added in an appropriate ratio and to protect the furnace walls well. In addition, the melting point can be reduced, thereby saving energy.
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| KR100954943B1 (en) * | 2008-02-28 | 2010-04-27 | 현대제철 주식회사 | Modifier for Electric furnace by using Waste Refractory, and method for producing the same |
| KR20170129493A (en) | 2016-05-17 | 2017-11-27 | 주식회사 선일로에스 | Permeable and high strength clay brick manufactured by using welding slag and manufacturing method thereof |
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| KR100954943B1 (en) * | 2008-02-28 | 2010-04-27 | 현대제철 주식회사 | Modifier for Electric furnace by using Waste Refractory, and method for producing the same |
| KR20170129493A (en) | 2016-05-17 | 2017-11-27 | 주식회사 선일로에스 | Permeable and high strength clay brick manufactured by using welding slag and manufacturing method thereof |
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