KR100665192B1 - A magnesium carbon board and the method thereof - Google Patents

A magnesium carbon board and the method thereof Download PDF

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KR100665192B1
KR100665192B1 KR1020040005135A KR20040005135A KR100665192B1 KR 100665192 B1 KR100665192 B1 KR 100665192B1 KR 1020040005135 A KR1020040005135 A KR 1020040005135A KR 20040005135 A KR20040005135 A KR 20040005135A KR 100665192 B1 KR100665192 B1 KR 100665192B1
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board
raw material
magnesium
fly ash
weight
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KR1020040005135A
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Korean (ko)
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KR20050077189A (en
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최동욱
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최동욱
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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
    • 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
    • C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
    • C04B18/08—Flue dust, i.e. fly ash
    • 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
    • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
    • C04B22/08—Acids or salts thereof
    • C04B22/12—Acids or salts thereof containing halogen in the anion
    • C04B22/124—Chlorides of ammonium or of the alkali or alkaline earth metals, e.g. calcium chloride
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
    • E04C2/02—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Structural Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Civil Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Architecture (AREA)
  • Inorganic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

본 발명은, 메카 보드 및 그 제조방법에 관한 것이다.The present invention relates to a mecha board and a manufacturing method thereof.

특히, 산화마그네슘과 염화마그네슘 및 플라이 애쉬를 교반탱크에 투입한 후 투입된 원료를 균일하게 교반하면 교반하고, 교반된 원료를 원하는 크기의 일정 판형태로 성형하여 로울러에 이동, 절단한 후, 일정 형상으로 형성된 성형보드를 일정시간 건조시킴으로서, 플라이 애쉬에 의한 표면치밀성을 강화하는 동시에 강도를 증진시키며, 마그네슘 보드의 균열현상을 개선하여 내구성을 증대시킬 수 있는 특징이 있다.In particular, after magnesium oxide, magnesium chloride, and fly ash are added to a stirring tank, the input raw material is stirred with uniform stirring, and the stirred raw material is formed into a predetermined plate shape having a desired size, moved to a roller, and cut, and then a predetermined shape. By drying the formed board formed for a predetermined time, it enhances the surface density by the fly ash and at the same time to increase the strength, and has the characteristics that can increase the durability by improving the crack phenomenon of the magnesium board.

플라이 애쉬, 보드Fly ash, board

Description

메카 보드 및 그 제조방법{A MAGNESIUM CARBON BOARD AND THE METHOD THEREOF} Mecha board and its manufacturing method {A MAGNESIUM CARBON BOARD AND THE METHOD THEREOF}             

도 1은 본 발명에 따른 메카 보드를 도시한 사진.1 is a photograph showing a mecha board according to the present invention.

도 2은 본 발명에 따른 메카 보드의 제조방법을 도시한 블록도. Figure 2 is a block diagram showing a manufacturing method of a mecha board according to the present invention.

도 3은 본 발명의 다른 실시예에 따른 메카 보드의 제조방법을 도시한 블록도. Figure 3 is a block diagram showing a method of manufacturing a mecha board according to another embodiment of the present invention.

본 발명은 마그네슘 카본(Magnesium-carbon) 보드 및 그 제조방법에 관한 것으로서, 보다 상세하게로는, 산화마그네슘과 염화마그네슘 및 플라이 애쉬를 교반탱크에 투입하는 원료투입단계와, 교반탱크내로 투입된 원료를 균일하게 교반하는 원료교반단계와, 교반된 원료를 원하는 크기의 일정 판형태로 성형하여 로울러를 통해 이동하는 원료성형단계와, 로울러에 의해 이동된 성형보드를 일정길이로 절단하는 절단단계와, 일정 형상의 성형보드를 일정시간 굳게 하여 건조시키는 건조단 계로 이루어져, 버려지는 플라이 애쉬를 재활용하여 표면의 치밀성을 강화하고, 내구성을 증진시키며, 보드의 균열현상을 개선할 수 있는 메카 보드 및 그 제조방법에 관한 것이다.The present invention relates to a magnesium-carbon board and a method for manufacturing the same, and more particularly, a raw material input step of introducing magnesium oxide, magnesium chloride, and fly ash into a stirring tank, and a raw material introduced into the stirring tank. A stirring step of uniformly stirring the raw material, a step of forming the stirred raw material into a predetermined plate shape of a desired size and moving through the roller, a cutting step of cutting the forming board moved by the roller to a predetermined length, and Mecca board and manufacturing method that consists of a drying step to harden the molded board of the shape for a certain period of time to recycle the discarded fly ash to enhance the compactness of the surface, improve durability and improve the cracking of the board It is about.

일반적으로 공기 중에서 물 및 이산화탄소를 흡수하여 서서히 히드록시탄산마그네슘이 되는 산화 마그네슘에, 염소와 마그네슘의 화합물로서 흡습성이 강하고 물, 알코올에 잘 녹아 무수물을 공업적으로 만드는 데 사용되는 염화마그네슘(MgCl2)을 반응시켜 마그네슘 보드를 성형하게 되는데, 이와 같이 제조된 마그네슘 보드는 백색으로 외관은 보기 좋으나, 표면치밀성이 약하여 강도가 떨어지는 문제점이 있었다.Magnesium chloride (MgCl 2) is used to make anhydrides industrially by absorbing water and carbon dioxide in the air and gradually absorbing water and carbon dioxide into magnesium hydroxycarbonate, which is highly hygroscopic as a compound of chlorine and magnesium, and soluble in water and alcohol. Reaction) to form a magnesium board, the magnesium board manufactured as described above has a good appearance, but the surface density is weak, there was a problem that the strength is low.

한편, 석탄을 원료로 하는 석탄 화력발전소에서는 매년 상당한 분량의 플라이 애쉬(Fly Ash)와, 신더 애쉬(Cinder Ash), 총 발생량의 약 15%~20%를 차지하는 바텀 애쉬(Bottom Ash) 등으로 이루어지는 석탄회가 발생되고 있으며, 이 중에서 플라이 애쉬 (Fly ash)는, 연소가스 중에 함유된 재를 총칭하는 것으로 화력발전소의 완전 연소되지 아니한 배기가스에 많이 포함되어 있으며, 재의 성분은 이산화규소, 산화알루미늄, 산화칼슘, 탄소, 이산화 규소의 함유율이 높고, 높은 열 때문에 유리질로 되어 있어 그 처리를 위한 처리시설의 확보가 국가적, 사회적으로 어려운 문제점이 발생되었다.On the other hand, coal-fired coal-fired power plants consist of a substantial amount of fly ash, cinder ash, and bottom ash, which account for about 15% to 20% of the total generation. Fly ash is generated. Among these, fly ash is a generic term for ashes contained in combustion gas, and is contained in exhaust gas which is not completely burned in thermal power plant. Ash ash is composed of silicon dioxide, aluminum oxide, The high content of calcium oxide, carbon, and silicon dioxide, and because of the high heat is made of glass, it is difficult to secure a treatment facility for the treatment nationally and socially.

상기와 같은 문제점을 개선하기 위한 본 발명의 목적은, 마그네슘 보드의 표면치밀성을 강화하여 강도와 내구성이 증진토록 하고, 보드의 균열현상을 개선하며, 버려지는 플라이 애쉬를 재활용할 수 있도록 하는 메카 보드 및 그 제조방법을 제공하는데 있다.
An object of the present invention for improving the above problems, to enhance the surface density of the magnesium board to enhance the strength and durability, improve the crack phenomenon of the board, to recycle the discarded fly ash board And to provide a method for producing the same.

상기 목적을 달성하기 위해 본 발명은, 산화마그네슘과 염화마그네슘 및 플라이 애쉬를 교반탱크에 투입하는 원료투입단계와,In order to achieve the above object, the present invention, the raw material input step of injecting magnesium oxide, magnesium chloride and fly ash into the stirring tank,

교반탱크내로 투입된 원료를 균일하게 교반하는 원료교반단계와,A raw material stirring step of uniformly stirring the raw materials introduced into the stirring tank,

원하는 크기의 교반된 원료를 일정 판형태로 성형하여 로울러에 의해 이동되는 원료성형단계와,A raw material forming step of forming a stirred plate of a desired size into a predetermined plate shape and moving by a roller;

로울러에 의해 이동된 성형된 성형보드를 일정길이로 절단하는 절단단계 및,Cutting step of cutting the molded molding board moved by the roller to a certain length,

일정 형상으로 형성된 성형보드를 일정시간 건조시켜 굳게 하는 건조단계로 이루어진다. It is made of a drying step of drying the molded board formed in a predetermined shape for a certain time to harden.

이때, 상기 원료성형단계는, 교반된 원료의 반응온도가 50~80℃의 반응온도로 유지되도록 실내온도를 15℃의 적정온도로 유지하는 것이 바람직하다.At this time, the raw material forming step, it is preferable to maintain the room temperature at an appropriate temperature of 15 ℃ so that the reaction temperature of the stirred raw material is maintained at a reaction temperature of 50 ~ 80 ℃.

그리고, 바람직하게 상기 원료교반단계는 교반되는 원료에서 불균일 반응 발생을 방지토록 교반탱크에서 15분 이내로 균일하게 교반한다.Preferably, the stirring step of the raw material is uniformly stirred within 15 minutes in the stirring tank to prevent the occurrence of non-uniform reaction in the raw material being stirred.

또한, 본 발명에 따른 메카 보드는, 산화마그네슘 50중량%과 염화마그네슘(황산마그네슘) 25중량%에 플라이 애쉬 25중량%를 혼합 반응하여 일정형상의 판형상 으로 이루어진다.In addition, the mecha board according to the present invention is made by mixing 50% by weight of magnesium oxide and 25% by weight of fly ash to 25% by weight of magnesium chloride (magnesium sulfate) in the form of a plate.

하기에서 본 발명을 설명함에 있어, 관련된 공지 기능 또는 구성에 대한 구체적인 설명이 본 발명의 요지를 불필요하게 흐릴 수 있다고 판단되는 경우에는 그 상세한 설명은 생략할 것이다.In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

그리고 후술되는 용어들은 본 발명에서의 기능을 고려하여 설정된 용어들로서 이는 생산자의 의도 또는 관례에 따라 달라질 수 있으므로 그 정의는 본 명세서 전반에 걸친 내용을 토대로 내려져야 할 것이다.The following terms are terms set in consideration of functions in the present invention, which may vary depending on the intention or custom of the producer, and their definitions should be made based on the contents throughout the specification.

이하, 첨부된 도면에 의거하여 본 발명의 실시예를 상세히 설명하기로 한다. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

본 발명은, 산화마그네슘과 염화마그네슘 및 플라이 애쉬를 투입하여 교반 한 후 일정 판형태로 성형한후 절단하여 건조시키는 일련의 과정을 통해 플라이 애쉬가 혼합된 마그네슘 보드를 제조하는 것이다.The present invention is to prepare a magnesium board in which fly ash is mixed through a series of processes in which magnesium oxide, magnesium chloride and fly ash are added, stirred, molded into a plate shape, cut and dried.

예컨데, 본 발명은 도 1 내지 도 3에서 도시된 바와 같이, 산화마그네슘(MgO)과 염화마그네슘(MgCl2) 및 플라이 애쉬 원료를 교반탱크에 투입하게 되는데, 투입되는 혼합물은 산화마그네슘(MgO) 45~60중량%과 염화마그네슘(MgCl2) 내지 황산마그네슘 20~30중량%에 플라이 애쉬를 20~25중량% 혼합하는 구성으로 이루어진다. For example, in the present invention, as shown in FIGS. 1 to 3, magnesium oxide (MgO), magnesium chloride (MgCl 2 ), and fly ash raw materials are added to a stirring tank, and the mixture is magnesium oxide (MgO) 45. It consists of a composition of 20 to 25% by weight of fly ash in ~ 60% by weight and 20-30% by weight of magnesium chloride (MgCl 2 ) to magnesium sulfate.

이때, 산화마그네슘(MgO)과 염화마그네슘(MgCl2) 및 플라이 애쉬가 섞인 혼합물에 혼합시 발생되는 혼합반응이 촉진토록 톱밥을 2~10중량% 더 첨가할 수도 있다.In this case, 2 to 10% by weight of sawdust may be further added to promote the mixing reaction generated when mixing the mixture of magnesium oxide (MgO), magnesium chloride (MgCl 2 ) and fly ash.

또한, 산화마그네슘과 염화마그네슘 및 플라이 애쉬가 교반탱크에 투입되어 균일하게 혼합시, 불균일 반응의 발생을 방지토록 교반탱크에서 15분 이내로 균일하게 교반하고, 상기 교반탱크의 용량은 균일한 교반을 위해 100kg이하가 유지되도록 하는 것이 좋다.In addition, when magnesium oxide, magnesium chloride and fly ash are added to the stirring tank and mixed uniformly, the mixture is stirred uniformly in the stirring tank within 15 minutes to prevent the occurrence of non-uniform reaction, and the capacity of the stirring tank is for uniform stirring. It is good to keep less than 100kg.

그리고, 산화마그네슘과 염화마그네슘 및 플라이 애쉬가 균일하게 혼합된 상태로 상기 교반탱크에서 배출되면 원하는 틀에 의해 성형이 가능토록 성형틀에 투입한 후 로울러에 의해 일측으로 성형하며 이동시키게 된다.Then, when the magnesium oxide, magnesium chloride and fly ash are discharged from the stirring tank in a uniformly mixed state, the mold is molded into a mold so as to be molded by a desired mold, and then moved to one side by a roller.

또한, 산화마그네슘과 염화마그네슘 및 플라이 애쉬가 균일하게 교반된 혼합물이 50℃에서 80℃의 반응온도가 이루어지도록 실내온도를 15℃의 적정온도로 유지하는 것이 바람직하며, 실내온도가 15℃ 이상의 온도로 유지될 경우에는 혼합물의 반응온도는 100℃ 이상으로 상승하여 마그네슘 보드 자체가 과열되어 타버릴 수 있어 주의를 요한다.In addition, it is preferable to maintain the indoor temperature at an appropriate temperature of 15 ℃ to achieve a reaction temperature of 50 ℃ to 80 ℃ in a mixture of magnesium oxide, magnesium chloride and fly ash uniformly stirred, the room temperature is 15 ℃ or more When maintained at, the reaction temperature of the mixture rises above 100 ° C, and the magnesium board itself may overheat and burn.

계속하여, 상기 로울러에 의해 이동된 성형보드는 작업장에서 원하는 사이즈로 구획토록 일정길이로 절단하고, 절단한 후에는 하루 정도 건조시킴으로서 원하는 강도의 굳기를 얻을 수 있게 된다.Subsequently, the forming board moved by the roller is cut to a predetermined length in a workshop to a desired size, and after cutting, it is dried for about one day to obtain firmness of desired strength.

이와같은 제조방법에 의해 생성된 본 발명은 산화마그네슘 45~60중량%과 염화마그네슘(황산마그네슘) 20~30중량%에 플라이 애쉬 20~25중량%를 혼합 반응한 판형상 보드로 이루어지며, 제조시 산화마그네슘과 염화마그네슘(황산마그네슘) 및 플라이 애쉬가 섞인 혼합물에 반응을 촉진시키기 위한 톱밥을 더 포함되어 형성될 수 있다.The present invention produced by such a manufacturing method consists of a plate-shaped board of 45 to 60% by weight of magnesium oxide and 20 to 30% by weight of magnesium chloride (magnesium sulfate) in a mixture of 20 to 25% by weight of fly ash. When the mixture of magnesium oxide, magnesium chloride (magnesium sulfate) and fly ash is mixed, the sawdust may be further included.

여기서, 성형된 마그네슘 보드의 플라이 애쉬가 20~25%를 넘어 30중량% 이상이 되는 경우에는 강도가 급격하게 저하되거나 균열이 생길 수 있어 플라이 애쉬는 20중량%가 투입되어 균일하게 혼합되는 것이 바람직하다. Here, when the fly ash of the molded magnesium board is more than 20 to 25% to 30% by weight or more, the strength may drop sharply or cracks may occur, so that the fly ash is 20% by weight to be uniformly mixed. Do.

이와같이 이루어진 본 발명의 작용을 설명하면 다음과 같다.Referring to the operation of the present invention made as described above is as follows.

먼저, 산화마그네슘과 염화마그네슘 및 플라이 애쉬를 교반탱크에 투입하고, 상기 교반탱크 내로 투입된 원료를 균일하게 15분 이내로 교반하되, 실내온도를 15℃로 유지하여 혼합물의 온도가 50℃~80℃로 유지되도록 한다.First, magnesium oxide, magnesium chloride, and fly ash are added to a stirring tank, and the raw material introduced into the stirring tank is uniformly stirred within 15 minutes, but the temperature of the mixture is maintained at 15 ° C. to 50 ° C. to 80 ° C. To be maintained.

계속하여, 교반된 원료를 원하는 크기의 일정 판형태로 성형하여 로울러에 의해 이동하게 되는데, 상기 로울러에 의해 이동된 성형보드를 일정길이로 절단한 후 일정 형상의 성형보드를 일정시간 건조시켜 마그네슘 보드를 제조하게 된다.Subsequently, the stirred raw material is molded into a predetermined plate shape of a desired size and moved by a roller. After cutting the molding board moved by the roller to a certain length, the molded board of a predetermined shape is dried for a predetermined time and then magnesium board It will be prepared.

이상에서 설명한 바아 같이, 본 발명은 플라이 애쉬를 마그네슘 보드에 혼합함으로서, 높은 압축강도를 갖으며, 내구성을 크게 향상시켜 장기간의 사용이 가능한 장점이 있는 것이다.As described above, the present invention has a high compressive strength by mixing the fly ash on the magnesium board, it has the advantage that can be used for a long time by greatly improving the durability.

본 발명은 특정한 실시 예에 관련하여 도시하고 설명 하였지만, 이하의 특허청구범위에 의해 제공되는 본 발명의 정신이나 분야를 벗어나지 않는 한도내에서 본 발명이 다양하게 개량 및 변화될 수 있는 것은 물론이다. While the invention has been shown and described with respect to specific embodiments thereof, it will be apparent that the invention can be variously modified and modified without departing from the spirit or scope of the invention as provided by the following claims.

이와같이 본 발명에 의하면, 마그네슘 보드에 플라이 애쉬를 혼합 성형함으로서 보드 표면의 치밀성을 강화하여 내구성과 강도를 증진시킬 수 있고, 보드의 균열현상을 개선하며, 수밀성을 크게 증대시킬 수 있는 잇점이 있다.As described above, according to the present invention, by mixing and molding fly ash on a magnesium board, it is possible to enhance the compactness of the surface of the board to enhance durability and strength, to improve cracking of the board, and to greatly increase watertightness.

또한, 본 발명은 주로 석탄을 원료로 하는 석탄 화력발전소에서 발생되는 플라이 애쉬를 마그네슘 보드에 적용함으로서 플라이 애쉬 처리를 위한 매립지 선정이나 처리시설의 확보 문제를 해결하는 동시에 자원을 재활용할 수 있는 경제적인 효과가 있는 것이다. In addition, the present invention by applying the fly ash generated from coal-fired power plant mainly from coal as a magnesium board to solve the problem of landfill selection or processing facilities for fly ash treatment and economical resources that can recycle resources It works.

Claims (7)

삭제delete 삭제delete 삭제delete 메카 보드의 제조방법에 있어서,In the manufacturing method of the mecha board, 산화마그네슘 45~60중량%과 염화마그네슘(황산마그네슘) 20~30중량%과 플라이 애쉬 20~25중량%를 교반탱크에 투입하는 원료투입단계;A raw material input step of adding 45 to 60% by weight of magnesium oxide, 20 to 30% by weight of magnesium chloride (magnesium sulfate) and 20 to 25% by weight of fly ash in a stirring tank; 교반탱크내로 투입된 원료의 불균일 반응 발생을 방지토록 15분 이내로 균일하게 교반하는 원료교반단계;A raw material stirring step of uniformly stirring within 15 minutes to prevent the occurrence of non-uniform reaction of the raw material introduced into the stirring tank; 교반된 원료를 원하는 크기의 일정 판형태로 성형하여 로울러에 의해 이동시킴과 아울러 교반된 원료의 반응온도가 50~80℃의 반응온도로 유지되도록 실내온도를 15℃의 온도로 유지하는 원료성형단계; 및The raw material forming step of molding the stirred raw material into a predetermined plate shape of a desired size and moving it by a roller and maintaining the indoor temperature at a temperature of 15 ° C. so that the reaction temperature of the stirred raw material is maintained at a reaction temperature of 50 to 80 ° C. ; And 일정 형상으로 형성된 성형보드를 일정시간 건조시켜 굳게 하는 건조단계;를 포함하여 이루어지는 것을 특징으로 하는 메카 보드 제조방법.Method of manufacturing a mecha board comprising a; drying step of drying the molded board formed in a predetermined shape for a certain time to solidify. 제 4항에 있어서,The method of claim 4, wherein 상기 원료투입단계는, 산화마그네슘과 염화마그네슘(황산마그네슘)과 플라이 애쉬가 섞인 혼합물의 반응이 촉진토록 톱밥을 더 첨가하는 것을 특징으로 하는 메카 보드 제조방법. The raw material input step, the method of manufacturing a mecha board, characterized in that the addition of sawdust to promote the reaction of the mixture of magnesium oxide, magnesium chloride (magnesium sulfate) and fly ash. 산화마그네슘 45~60중량%과 염화마그네슘(황산마그네슘) 20~30중량%에 플라이 애쉬 20~25중량%를 혼합 반응하여 일정형상의 판형상 보드로 이루어지는 것을 특징으로 하는 메카 보드.A mecha board comprising 45 to 60% by weight of magnesium oxide and 20 to 25% by weight of fly ash in a mixture of 20 to 30% by weight of magnesium chloride (magnesium sulfate). 삭제delete
KR1020040005135A 2004-01-27 2004-01-27 A magnesium carbon board and the method thereof KR100665192B1 (en)

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