KR100383101B1 - Inorganic refractory paint having good heat emissivity - Google Patents

Inorganic refractory paint having good heat emissivity Download PDF

Info

Publication number
KR100383101B1
KR100383101B1 KR10-2000-0086016A KR20000086016A KR100383101B1 KR 100383101 B1 KR100383101 B1 KR 100383101B1 KR 20000086016 A KR20000086016 A KR 20000086016A KR 100383101 B1 KR100383101 B1 KR 100383101B1
Authority
KR
South Korea
Prior art keywords
refractory
weight
chromium
parts
light
Prior art date
Application number
KR10-2000-0086016A
Other languages
Korean (ko)
Other versions
KR20020058174A (en
Inventor
조문규
조용호
박병곤
Original Assignee
주식회사 포스코
주식회사 케이에스티
재단법인 포항산업과학연구원
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 포스코, 주식회사 케이에스티, 재단법인 포항산업과학연구원 filed Critical 주식회사 포스코
Priority to KR10-2000-0086016A priority Critical patent/KR100383101B1/en
Publication of KR20020058174A publication Critical patent/KR20020058174A/en
Application granted granted Critical
Publication of KR100383101B1 publication Critical patent/KR100383101B1/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/24—Acids; Salts thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
    • C08K3/346—Clay
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/18—Fireproof paints including high temperature resistant paints
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2227—Oxides; Hydroxides of metals of aluminium

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Inorganic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Dispersion Chemistry (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Ceramic Products (AREA)

Abstract

본 발명은 공업용 가열로의 내장 내화물의 표면에 도포하여 가열로의 열효율을 향상시키고, 외부 분위기로부터 내화물을 보호하는 내화물 도포용 내화도료에 관한 것이다. 본 발명의 내화도료는 a) Cr2O3의 함량이 30∼70 중량%이고 평균입경이 5∼40㎛인 크롬광 40∼70 중량부, b) 알루미나 졸, 실리카 졸, 알칼리 실리케이트, 티탄산 알루미늄 고용체, 몬티셀라이트(monticellite), 하소 알루미나(calcined alumina), 알루미나 시멘트 및 이들의 혼합물로 이루어진 군에서 선택되는 무기화합물 2∼10 중량부, 및 c) pH 7∼9인 수분 28∼51 중량부를 포함한다.The present invention relates to a refractory coating material for refractory coating, which is applied to the surface of a built-in refractory of an industrial furnace to improve the thermal efficiency of the furnace and protect the refractory from the external atmosphere. The refractory coating material of the present invention comprises: a) 40 to 70 parts by weight of chromium light having a Cr 2 O 3 content of 30 to 70% by weight and an average particle diameter of 5 to 40 μm, b) an alumina sol, silica sol, alkali silicate, aluminum titanate 2 to 10 parts by weight of an inorganic compound selected from the group consisting of solid solution, monticellite, calcined alumina, alumina cement and mixtures thereof, and c) 28 to 51 parts by weight of water having a pH of 7 to 9 .

Description

열복사율이 우수한 무기계 내화도료{INORGANIC REFRACTORY PAINT HAVING GOOD HEAT EMISSIVITY}BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an inorganic refractory coating,

발명의 분야Field of invention

본 발명은 공업용 가열로의 내화물 도포용 무기계 내화도료에 관한 것으로 보다 상세하게는 각종 공업용 가열로의 내장 내화물의 표면에 도포하여 가열로의 열효율을 향상시키고, 외부 분위기로부터 내화물을 보호하는 공업용 가열로의 내화물 도포용 무기계 내화도료에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inorganic refractory coating material for refractory coating of an industrial furnace, and more particularly to an industrial refractory coating material applied to the surface of a built-in refractory of various industrial furnaces to improve thermal efficiency of the heating furnace, The present invention relates to an inorganic refractory coating material for refractory coating.

종래 기술Conventional technology

고온으로 조업되는 공업용 가열로에서 열효율을 높이기 위해 화로내 벽면에 열복사율이 높은 내화도료를 도포하는 방법이 많이 이용되고 있다. 종래에는 열복사율이 높은 200 메쉬 이하의 실리콘 카바이드(SiC) 분말을 결합제 및 첨가제와 혼합한 도료를 사용하였다. 실리콘 카바이드 분말을 포함하는 도료는, 화로내 벽면의 열복사율을 증대시킴으로써 화로의 승온시간 단축, 피가열물에 대한 열복사 열량의 증가 등으로 화로에 사용되는 연료의 원단위를 2∼20% 절감할 수 있다고 보고된 바 있다. 하지만 SiC 분말은 산화분위기에서 800℃ 이상의 고온이 되면 산화되어 우수한 열복사능이 없어지는 단점이 있다.A method of applying a refractory coating having a high heat radiation rate to the inner wall surface of a furnace is frequently used in an industrial furnace operated at a high temperature to increase thermal efficiency. Conventionally, a coating material obtained by mixing silicon carbide (SiC) powder of 200 mesh or less, which has a high heat radiation rate, with a binder and an additive is used. The coating material containing silicon carbide powder can reduce the basic amount of fuel used in the furnace by 2 to 20% by increasing the heat radiation rate of the inner wall surface of the furnace, shortening the temperature rise time of the furnace, . However, the SiC powder is oxidized when the temperature is higher than 800 ° C. in an oxidizing atmosphere, and the SiC powder is disadvantageous in that excellent thermal barrier performance is lost.

이러한 단점을 해결하기 위한 것으로, 일본 특허공개 소63-29712에는 분말상의 크롬광(chromite)을 주원료로 하여, 결합제 및 분산제를 첨가한 내화도료가 개시되어 있다. 일본 특허공개 평3-229829에는 크롬광을 주성분으로 한 내화도료를 냉간압연 강판용 가열로의 화로내 벽면에서 도포함으로써 연료 원단위를 3% 절감할 수 있다고 기재되어 있다. 또한, 일본 특허공개 평10-274482에는 가열로의 전부위를 도포하지 않고 피가열물의 장입구에서 최인접한 가열대에만 크롬광을 포함한 내화도료를 1∼2mm 두께로 도포함으로써 경제적인 비용으로 가열로의 열효율을 향상할 수 있다고 기재되어 있다.To solve these drawbacks, Japanese Patent Application Laid-Open No. 63-29712 discloses a refractory paint in which a binder and a dispersant are added, using powdery chromite as a main raw material. Japanese Unexamined Patent Publication (Kokai) No. 3-229829 discloses that the basic unit of fuel can be reduced by 3% by applying a refractory paint containing chromium light as a main component on the inner wall surface of a furnace for a cold-rolled steel sheet furnace. Japanese Unexamined Patent Application, First Publication No. Hei 10-274482 discloses a method of coating a refractory paint containing chromium light in a thickness of 1 to 2 mm only on the nearest heating zone at the entrance of the object to be heated without applying the entire portion of the heating furnace, The thermal efficiency can be improved.

그러나 상기 방법들은 고가의 크롬광을 주원료로 사용하기 때문에 내화도료의 가격이 비싸며, 또한 경제적인 측면을 고려하여 부분적인 도포방식을 적용할 경우 전체 부위를 도포한 경우에 비해 열복사 열량의 증가량이 낮을 것이 분명하므로 원료 원단위를 저감시키는 데 한계가 있다. 또한 1300℃ 이상의 고온으로 조업되는 공업로에 적용할 경우 사용한 첨가제등으로부터 저융점 화합물들이 생성되어 도료의 부착성을 저하시킴으로써 장시간 사용하기가 어렵거나 화로내 벽면이 손상되는 문제점이 있다.However, since the cost of the refractory paint is high because expensive chromium light is used as the main raw material, and the partial coating method is applied economically, the increase in the heat radiation amount is lower than the case where the whole part is applied It is obvious that there is a limit to reducing the raw material intensity. In addition, when applied to an industrial furnace operating at a high temperature of 1300 DEG C or higher, low melting point compounds are generated from additives and the like to lower the adhesion of the paint, thereby making it difficult to use for a long time or damaging the inner wall of the furnace.

본 발명은 상기한 바와 같은 문제점을 해결하기 위한 것으로서, 저가의 원료를 사용함으로써 제조 비용이 저렴한 공업용 가열로의 내화물 도포용 무기계 내화도료를 제공하기 위한 것이다.An object of the present invention is to provide an inorganic refractory coating material for refractory coating of an industrial furnace having a low manufacturing cost by using a low cost raw material.

본 발명의 다른 목적은 1300℃ 이상의 고온 조업시에도 화로내 벽면에 대한 부착성이 우수하여 장시간 사용 가능한 공업용 가열로의 내화물 도포용 무기계 내화도료를 제공하기 위한 것이다.Another object of the present invention is to provide an inorganic refractory coating material for refractory application in an industrial furnace which is excellent in adhesion to a wall surface of a furnace even when operating at a high temperature of 1300 DEG C or higher and can be used for a long time.

본 발명의 또다른 목적은 열복사능이 우수하여 연료 원단가를 저감할 수 있는 공업용 가열로의 내화물 도포용 무기계 내화도료를 제공하기 위한 것이다.Another object of the present invention is to provide an inorganic refractory coating material for refractory coating of an industrial furnace capable of reducing the cost of fuel fabrication due to its excellent heat-resisting ability.

상기한 본 발명의 목적을 달성하기 위하여, 본 발명은In order to achieve the above object of the present invention,

a) Cr2O3의 함량이 30∼70 중량%이고 평균입경이 5∼40㎛인 크롬광 40∼70 중량부, b) 알루미나 졸, 실리카 졸, 알칼리 실리케이트, 티탄산 알루미늄 고용체, 몬티셀라이트(monticellite), 하소 알루미나(calcined alumina), 알루미나 시멘트 및 이들의 혼합물로 이루어진 군에서 선택되는 무기화합물 2∼10 중량부, 및 c) pH 7∼9인 수분 28∼51 중량부를 포함하는 공업용 가열로의 내화물 도포용 무기계 내화도료를 제공한다.(a) 40 to 70 parts by weight of chromium light having a Cr 2 O 3 content of 30 to 70% by weight and an average particle diameter of 5 to 40 μm, (b) an alumina sol, silica sol, alkali silicate, aluminum titanate solid solution, monticellite 2 to 10 parts by weight of an inorganic compound selected from the group consisting of monticellite, calcined alumina, alumina cement and mixtures thereof, and c) 28 to 51 parts by weight of water having a pH of 7 to 9 An inorganic fire-resistant paint for refractory application.

이하, 본 발명을 더욱 상세히 설명한다.Hereinafter, the present invention will be described in more detail.

본 발명의 공업용 가열로의 내화물 도포용 무기계 내화도료는 a) Cr2O3의 함량이 30∼70 중량%이고 평균입경이 5∼40㎛인 크롬광 40∼70 중량부, b) 알루미나 졸, 실리카 졸, 알칼리 실리케이트, 티탄산 알루미늄 고용체, 몬티셀라이트, 하소 알루미나, 알루미나 시멘트 및 이들의 혼합물로 이루어진 군에서 선택되는 무기화합물 2∼10 중량부, 및 c) pH 7∼9인 수분 28∼51 중량부로 이루어진다. 이하에서각 성분 및 함량을 상세히 설명한다.The inorganic refractory coating material for refractory coating of an industrial furnace of the present invention comprises a) 40 to 70 parts by weight of chromium light having a Cr 2 O 3 content of 30 to 70% by weight and an average particle diameter of 5 to 40 μm, b) 2 to 10 parts by weight of an inorganic compound selected from the group consisting of silica sol, alkali silicate, aluminum titanate solid solution, monticellite, calcined alumina, alumina cement and mixtures thereof, and c) 28 to 51 wt% Part. Each component and content will be described in detail below.

본 발명에서 제1 성분으로 사용되는 크롬광은 MgO-Cr2O3계 폐내화물의 분쇄물에서 얻어진 크롬광과 천연광석으로부터 정제하여 얻어진 크롬광을 0:10∼7:3의 중량비로 배합하는 것이 바람직하다. 폐내화물로부터 얻은 크롬광의 배합량이 높아지면 내화도료의 단가는 낮아지지만, 설비나 사용부위에 따라 수거한 크롬광중의 Cr2O3함량 차이가 크기 때문에 사용량이 70%보다 많으면 내화도료의 열복사율이 급격하게 저하되는 문제점이 있다.The chromium light used as the first component in the present invention is obtained by mixing chromium light obtained from the pulverized product of MgO-Cr 2 O 3 based waste refractory and chromium light obtained by purification from natural ore at a weight ratio of 0:10 to 7: 3 . If the amount of chromium light obtained from the waste refractory is increased, the unit cost of the refractory paint is lowered. However, since the difference in the content of Cr 2 O 3 in the chrome light collected depending on the facility or the use site is large, There is a problem in that it is deteriorated rapidly.

상기 MgO-Cr2O3계 폐내화물의 분쇄물에서 얻어진 크롬광은 크롬광 클링커로 제조된 MgO-Cr2O3계 폐내화물 중에서 변질층을 제외한 나머지 부위를 분쇄한 다음 비중이 높은 크롬광 입자만을 선별, 분리하여 건조 및 체분리하여 얻은 것이 바람직하다.The chromium light obtained from the pulverized product of the MgO-Cr 2 O 3 -based refractory material is obtained by pulverizing the remaining portion of the MgO-Cr 2 O 3 -based waste refractory made of the chromium optical clinker except for the denaturated layer, Are separated, dried and sieved.

MgO-Cr2O3계 내화물은 시멘트 소성로, 제강설비인 탈가스(RH) 장치등의 내장재로 사용되는 것으로 마그네시아와 크롬광을 주원료로 하여 제조되며, 사용 후 수거한 폐내화물은 외래 성분이 침투한 변질층과 원래의 조성을 유지하고 있는 원질층으로 구성되어 있다. 원질층의 미세조직을 보면 마그네시아와 크롬광의 열팽창율 차이 때문에 크롬광 입자주위로 공극이 형성되어 있다. 따라서 원질층 부위를 분쇄하면 마그네시아와 크롬광 입자간의 분리가 쉽게 일어나고, 이러한 분쇄물을 부유선광법으로 정제함으로써 비중이 높은 크롬광 입자만을 용이하게 얻을 수 있다.MgO-Cr 2 O 3 -based refractories are used as interior materials for cement kiln furnaces and degassing (RH) equipment for steelmaking, and are manufactured using magnesia and chrome as main raw materials. A denatured layer and an original layer that maintains its original composition. In the microstructure of the crude layer, voids are formed around the chromium particles due to the difference in thermal expansion coefficient between magnesia and chrome light. Therefore, when the raw layer portion is crushed, the separation between the magnesia and the chromium photoparticle occurs easily. By purifying the crushed material by the floatation method, only the chromium photoparticles having a high specific gravity can be easily obtained.

폐내화물로부터 얻는 크롬광 입자들은 사용중 마그네시아 등과의 반응, Cr 성분의 휘발 등으로 인하여 원료로 사용된 크롬광 입자에 비해 Cr2O3함량이 낮으므로, 이러한 손실분을 고려하여 내화도료의 원료로 사용하는 크롬광보다 Cr2O3함량이 5∼10 중량% 높은 크롬광 클링커를 원료로 사용한 MgO-Cr2O3계 폐내화물중에서 얻는 것이 바람직하다.The Cr 2 O 3 content of the chromium photoparticles obtained from the waste refractory is lower than that of the chromium photoparticles used as the raw material due to the reaction with the magnesia and the like and the volatilization of the Cr component during use. Cr 2 O 3 -based waste refractory using, as a raw material, a chromium optical clinker having a Cr 2 O 3 content of 5 to 10% by weight higher than that of the chrome light.

본 발명에 사용되는 크롬광은 30∼70 중량%의 Cr2O3를 함유한다. Cr2O3의 함량이 30 중량%보다 적으면 열복사율이 낮아 사용상의 이점이 없고 70 중량%보다 많으면 열복사율은 크게 증가하지 않으면서 가격이 고가이므로 바람직하지 않다.The chromium light used in the present invention contains 30 to 70% by weight of Cr 2 O 3 . When the content of Cr 2 O 3 is less than 30% by weight, the heat radiation rate is low and there is no advantage in use. When the content of Cr 2 O 3 is more than 70% by weight, the heat radiation rate does not increase greatly,

본 발명에 사용되는 크롬광의 평균입경은 5∼40㎛이다. 크롬광의 평균입경이 5㎛보다 작으면 내화도료의 작업성이 떨어지거나 첨가 수분이 증가하여 부착성이 저하한다. 반면에 40㎛보다 크면 입자의 비표면적이 낮아 내화도료의 열복사율이 저하한다.The average particle diameter of the chromium light used in the present invention is 5 to 40 mu m. If the average particle diameter of the chrome light is smaller than 5 占 퐉, the workability of the refractory coating is deteriorated or the added water is increased to deteriorate the adhesion. On the other hand, if it is larger than 40 mu m, the specific surface area of the particles is low, and the heat radiation rate of the refractory coating is lowered.

본 발명의 내화도료중 크롬광은 40∼70 중량부로 함유된다. 내화도료중 크롬광의 함량이 40 중량부보다 적으면 내화도료의 열복사율이 낮아서 사용 이점이 없고 70 중량부보다 많으면 도료의 작업성이 떨어져서 바람직하지 않다.The chromium light in the refractory paint of the present invention is contained in an amount of 40 to 70 parts by weight. If the content of chromium light in the refractory paint is less than 40 parts by weight, the heat radiation rate of the refractory paint is low, and there is no advantage in use. If the content is more than 70 parts by weight, the workability of the paint is decreased.

본 발명의 내화도료에 제2 성분으로 첨가되는 무기화합물은 알루미나 졸, 실리카 졸, 알칼리 실리케이트, 티탄산 알루미늄 고용체, 몬티셀라이트, 하소 알루미나, 알루미나 시멘트 및 이들의 혼합물로 이루어진 군에서 선택된다. 상기 알칼리실리케이트이 예로는 K2O-SiO2와 Na2O-SiO2가 있다.The inorganic compound added as the second component to the refractory coating of the present invention is selected from the group consisting of alumina sol, silica sol, alkali silicate, aluminum titanate solid solution, monticellite, calcined alumina, alumina cement and mixtures thereof. Examples of the alkali silicate include K 2 O-SiO 2 and Na 2 O-SiO 2 .

본 발명의 내화도료중 무기화합물의 첨가량은 2∼10 중량부이다. 내화도료중 무기화합물의 함량이 2 중량부보다 적으면 내화도료의 부착성이 낮아 장시간 사용하기가 어렵고, 10 중량부보다 많으면 부착성은 크게 증가하지 않으나 도료의 열복사율이 낮으므로 바람직하지 않다.The amount of the inorganic compound added in the refractory paint of the present invention is 2 to 10 parts by weight. If the content of the inorganic compound in the refractory coating is less than 2 parts by weight, the adhesion of the refractory coating is low and it is difficult to use for a long time. If the content of the inorganic compound is more than 10 parts by weight, the adhesion is not greatly increased but the heat radiation rate of the coating is low.

본 발명의 내화도료에 제3 성분으로 첨가되는 수분의 pH는 7∼9이다. 상기 수분의 pH가 7보다 작거나 9보다 크면 결합제로 사용하는 무기화합물들의 응집이나 침전을 촉진하므로 도료의 작업성과 부착성을 감소시킨다.The pH of the water added as the third component to the refractory coating of the present invention is 7 to 9. When the pH of the water is less than 7 or more than 9, aggregation or precipitation of inorganic compounds used as a binder is promoted, thereby reducing workability and adhesion of the coating.

본 발명의 내화도료중 수분 함량은 28∼51 중량부이다. 내화도료중 수분의 첨가량이 28 중량부보다 적으면 내화도료의 작업성이 낮아 시공하기 어렵고 51 중량부보다 많으면 도료의 부착성이 떨어져 장시간 사용하기 곤란하다.The water content of the refractory coating of the present invention is 28 to 51 parts by weight. If the addition amount of water in the refractory paint is less than 28 parts by weight, workability of the refractory paint is low and it is difficult to apply. If it is more than 51 parts by weight, adhesion of the paint is poor and it is difficult to use for a long time.

이하, 본 발명의 이해를 돕기 위하여 바람직한 실시예를 제시한다. 그러나, 하기의 실시예는 본 발명의 이해를 돕기 위하여 제시되는 것일 뿐 본 발명이 하기하는 실시에에 한정되는 것은 아니다.Hereinafter, preferred embodiments of the present invention will be described in order to facilitate understanding of the present invention. However, the following embodiments are presented to aid understanding of the present invention, and the present invention is not limited to the following embodiments.

실시예 및 비교예Examples and Comparative Examples

실시예 1Example 1

MgO-Cr2O3계 폐내화물로부터 얻은 크롬광은 Cr2O3함량이 50∼55 중량%인 크롬광 클링커를 원료로 사용한 MgO-Cr2O3계 폐내화물 중에서 변질층을 제외한 나머지 부위를 분쇄한 다음 비중이 높은 크롬광 입자만을 선별, 분리하여 건조 및 체분리하여 크롬광을 얻었다. 상기 MgO-Cr2O3계 폐내화물의 분쇄물에서 얻은 크롬광과 천연광석으로부터 정제하여 얻어진 크롬광을 7:3의 중량비로 혼합하여 Cr2O3함량이 45 중량%이고 평균입경이 20㎛인 크롬광을 준비하였다. 상기 크롬광 50 중량부, 알칼리 실리케이트 5 중량부, 및 pH 9인 수분 45 중량부를 혼합하여 내화도료를 제조하였다.The chromium light obtained from the MgO-Cr 2 O 3 -based waste refractory material is composed of the MgO-Cr 2 O 3 -based waste refractory using the chromium optical clinker having the Cr 2 O 3 content of 50 to 55 wt% as a raw material, After crushing, only chromium particles with high specific gravity were selected, separated, dried and sieved to obtain chrome light. The chrome light obtained from the pulverized product of the MgO-Cr 2 O 3 -based waste refractory and the chrome light obtained by purification from the natural ore were mixed in a weight ratio of 7: 3 to obtain a powder having a Cr 2 O 3 content of 45% by weight and an average particle size of 20 μm Chromium light was prepared. 50 parts by weight of the chromium light, 5 parts by weight of alkali silicate and 45 parts by weight of water having a pH of 9 were mixed to prepare a refractory coating material.

실시예 2Example 2

크롬광의 원료로 천연광석으로부터 정제하여 얻어진 것만을 사용하였다. 50 중량%의 Cr2O3를 포함하고 크롬광의 입경이 40㎛인 크롬광 60 중량부, 알칼리 실리케이트 7 중량부, 및 pH 9인 수분 33 중량부를 혼합하여 내화도료를 제조하였다.Only those obtained by purifying natural ores as raw materials of chrome light were used. 60 parts by weight of chromium light containing 50% by weight of Cr 2 O 3 and having a particle diameter of 40 μm of chromium light, 7 parts by weight of alkali silicate and 33 parts by weight of water having a pH of 9 were mixed to prepare a refractory coating material.

실시예 3Example 3

MgO-Cr2O3계 폐내화물로부터 얻은 크롬광은 Cr2O3함량이 70∼75 중량%인 크롬광 클링커를 원료로 사용한 MgO-Cr2O3계 폐내화물 중에서 변질층을 제외한 나머지 부위를 분쇄한 다음 비중이 높은 크롬광 입자만을 선별, 분리하여 건조 및 체분리하여 크롬광을 얻었다. 상기 MgO-Cr2O3계 폐내화물의 분쇄물에서 얻은 크롬광과 천연광석으로부터 정제하여 얻어진 크롬광을 5:5의 중량비로 혼합하여 Cr2O3함량이 65 중량%이고 평균입경이 30㎛인 크롬광을 준비하였다. 상기 크롬광 45 중량부, 알칼리 실리케이트 4 중량부, 및 pH 9인 수분 51 중량부를 혼합하여 내화도료를 제조하였다.The chromium light obtained from the MgO-Cr 2 O 3 -based waste refractory material is composed of the MgO-Cr 2 O 3 -based waste refractories using the chromium optical clinker having the Cr 2 O 3 content of 70 to 75 wt% as a raw material, After crushing, only chromium particles with high specific gravity were selected, separated, dried and sieved to obtain chrome light. The chromium light obtained from the pulverized product of the MgO-Cr 2 O 3 -based waste refractory material and the chromium light obtained by purification from the natural ore were mixed in a weight ratio of 5: 5 to obtain a steel sheet having a Cr 2 O 3 content of 65% by weight and an average particle size of 30 μm Chromium light was prepared. 45 parts by weight of the above chromium light, 4 parts by weight of alkali silicate and 51 parts by weight of water having a pH of 9 were mixed to prepare a refractory coating material.

비교예 1∼11Comparative Examples 1 to 11

MgO-Cr2O3계 폐내화물의 분쇄물에서 얻은 크롬광과 천연광석으로부터 정제하여 얻어진 크롬광의 중량비, 크롬광중 Cr2O3의 함량, 크롬광의 함량, 크롬광의 평균입경, 및 수분의 함량과 pH를 하기 표 1에 기재된 대로 변화시킨 것을 제외하고 실시예 1과 동일한 방법으로 내화도료를 제조하였다.The weight ratio of the chromium light obtained from the pulverized product of the MgO-Cr 2 O 3 -based waste refractory material to the chromium light purified from the natural ore, the content of Cr 2 O 3 in the chrome light, the content of the chrome light, the average particle size of the chrome light, A refractory coating material was prepared in the same manner as in Example 1, except that the pH was changed as shown in Table 1 below.

크롬광의중량비a Weight ratio of chrome light a 크롬광중Cr2O3의 함량(중량%)Content of Cr 2 O 3 in chromium light (wt%) 크롬광입경(㎛)Chrome light particle size (탆) 크롬광b Chrome light b 알칼리실리케이트b Alkali silicate b 수분b Moisture b 수분pHMoisture pH 실시예 1Example 1 7:37: 3 4545 2020 5050 55 4545 99 실시예 2Example 2 0:100:10 5050 4040 6060 77 3333 99 실시예 3Example 3 5:55: 5 6565 3030 4545 44 5151 99 비교예 1Comparative Example 1 10:010: 0 4545 2020 5050 55 4545 99 비교예 2Comparative Example 2 7:37: 3 2525 2020 5050 55 4545 99 비교예 3Comparative Example 3 7:37: 3 8080 2020 5050 55 4545 99 비교예 4Comparative Example 4 7:37: 3 4545 22 5050 55 4545 99 비교예 5Comparative Example 5 7:37: 3 4545 7575 5050 55 4545 99 비교예 6Comparative Example 6 7:37: 3 4545 2020 2020 55 7575 99 비교예 7Comparative Example 7 7:37: 3 4545 2020 8080 55 1515 99 비교예 8Comparative Example 8 7:37: 3 4545 2020 5050 1One 4949 99 비교예 9Comparative Example 9 7:37: 3 4545 2020 5050 1515 3535 99 비교예 10Comparative Example 10 7:37: 3 4545 2020 5050 55 4545 33 비교예 11Comparative Example 11 7:37: 3 4545 2020 5050 55 4545 1212

주) a: 폐내화물의 크롬광 : 천연광석의 크롬광의 중량비Note: a: Chromium light of waste refractory: Chromium light weight ratio of natural ore

b: 크롬광, 알칼리 실리케이트, 수분의 함량 단위는 모두 중량부이다.b: The content of chromium light, alkali silicate and water are all in parts by weight.

상기 실시예 1∼3 및 비교예 1∼11에 따라 제조된 내화도료를 스프레이 건(spray gun)을 이용하여 Al2O3계 내화물 표면에 도포하여 시편을 준비하였다. 내화도료의 작업성을 평가하기 위하여 스프레이 건을 사용한 시공의 가능성 여부, 그리고 혼련물의 점도를 측정하였다. 부착성 평가기준으로 열충격 시험 전후의 도료 면적의 잔존율을 측정하였으며, 1300℃로 유지된 전기로에 시편을 장입하고 30분간 유지한 후 꺼내어 공냉하는 과정을 반복한 다음 내화도료의 탈락된 부위의 면적을 계산하여 잔존율을 산출하였다. 내화도료의 열복사율은 공업용 전기로의 내벽면에 도료를 도포한 다음 1500℃까지 승온시 소요되는 전력량을 측정하여 비교하였으며, 비교예 1의 도료 적용시 측정된 전력량을 기준으로 하여 측정값을 환산하였다. 측정결과를 하기 표 2에 기재하였다.The refractory coatings prepared according to Examples 1 to 3 and Comparative Examples 1 to 11 were applied to the surface of the Al 2 O 3 refractory using a spray gun to prepare specimens. In order to evaluate the workability of the refractory paint, the possibility of using a spray gun and the viscosity of the kneaded product were measured. The residual ratio of the paint area before and after the thermal shock test was measured by the adhesion evaluation method. The test piece was charged into an electric furnace maintained at 1300 ° C., held for 30 minutes, and then taken out and air-cooled. And the residual ratio was calculated. The heat radiation rate of the refractory paint was measured by comparing the amount of power consumed when the paint was applied to the inner wall surface of the industrial electric furnace and then heated up to 1500 ° C and the measured value was converted on the basis of the electric power measured when applying the paint of Comparative Example 1 . The measurement results are shown in Table 2 below.

작업성* Workability * 잔존율(%)Remaining rate (%) 열복사율Thermal Emissivity 실시예 1Example 1 양호Good 9696 150150 실시예 2Example 2 양호Good 9595 160160 실시예 3Example 3 양호Good 9696 155155 비교예 1Comparative Example 1 양호Good 9595 100100 비교예 2Comparative Example 2 양호Good 9393 7070 비교예 3Comparative Example 3 양호Good 9494 105105 비교예 4Comparative Example 4 불량Bad -- -- 비교예 5Comparative Example 5 양호Good 8585 7474 비교예 6Comparative Example 6 양호Good 9191 7070 비교예 7Comparative Example 7 불량Bad -- -- 비교예 8Comparative Example 8 양호Good 6060 110110 비교예 9Comparative Example 9 양호Good 9494 9090 비교예 10Comparative Example 10 응집Cohesion -- -- 비교예 11Comparative Example 11 침강sedimentation -- --

주) *: 작업성이 불량하거나 응집 또는 침강 현상이 발생한 비교예 4, 7, 10 및 11의 경우에는 도포가 불가능하여 다른 물성을 측정하지 않았다.*: In the case of Comparative Examples 4, 7, 10, and 11 in which workability was poor or aggregation or sedimentation occurred, the application was impossible and no other physical properties were measured.

표 1에 나타낸 바와 같이, 본 발명의 범위를 벗어난 조건으로 제조한 비교예 1∼11의 경우 작업성, 부착성(잔존율), 및 열복사율이 낮음을 알 수 있다. 반면에 본 발명의 조건 범위로 제조된 실시예 1∼3의 경우 작업성과 부착성이 양호하고 열복사율도 우수함을 알 수 있다.As shown in Table 1, in Comparative Examples 1 to 11 prepared under conditions outside the range of the present invention, it can be seen that workability, adhesion (remaining ratio), and heat radiation rate are low. On the other hand, Examples 1 to 3 prepared under the condition range of the present invention show good workability and adhesion, and excellent heat radiation rate.

본 발명의 경우 1300℃ 이상의 고온조업시에도 화로내 벽면에 대한 부착성이 우수하여 장시간 사용이 가능하며, 저가의 원료를 사용하므로 비용 절감의 효과가 있으며, 열복사율이 우수하므로 각종 공업용 가열로의 열효율을 향상시킬 수 있다.According to the present invention, it is possible to use for a long time because of its excellent adhesion to the inner wall of the furnace even when operating at a high temperature of 1300 ° C or higher, and it is possible to reduce cost by using low cost raw materials. The thermal efficiency can be improved.

본 발명의 단순한 변형 또는 변경은 모두 이 분야의 통상의 지식을 가진 자에 의하여 용이하게 실시될 수 있으며 이러한 변형이나 변경은 모두 본 발명의 영역에 포함되는 것으로 볼 수 있다.It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (3)

a) Cr2O3의 함량이 30∼70 중량%이고 평균입경이 5∼40㎛인 크롬광 40∼70 중량부;a) 40 to 70 parts by weight of chromium light having a Cr 2 O 3 content of 30 to 70% by weight and an average particle diameter of 5 to 40 μm; b) 알루미나 졸, 실리카 졸, 알칼리 실리케이트, 티탄산 알루미늄 고용체, 몬티셀라이트(monticellite), 하소 알루미나(calcined alumina), 알루미나 시멘트 및 이들의 혼합물로 이루어진 군에서 선택되는 무기화합물 2∼10 중량부; 및b) 2 to 10 parts by weight of an inorganic compound selected from the group consisting of alumina sol, silica sol, alkali silicate, aluminum titanate solid solution, monticellite, calcined alumina, alumina cement and mixtures thereof; And c) pH 7∼9인 수분 28∼51 중량부c) 28 to 51 parts by weight of water having a pH of 7 to 9 를 포함하는 공업용 가열로의 내화물 도포용 무기계 내화도료.An inorganic refractory coating for refractory coating of an industrial furnace. 제1항에 있어서, 상기 크롬광은 MgO-Cr2O3계 폐내화물의 분쇄물에서 얻어진 크롬광과 천연광석으로부터 정제하여 얻어진 크롬광이 0:10∼7:3의 중량비로 배합된 것인 공업용 가열로의 내화물 도포용 무기계 내화도료.The method according to claim 1, wherein the chromium light is obtained by mixing chromium light obtained from a pulverized product of a MgO-Cr 2 O 3 based waste refractory material and chromium light obtained by purification from natural ore in a weight ratio of 0:10 to 7: 3 Inorganic fire - resistant paints for refractory application in industrial furnaces. 제2항에 있어서, 상기 MgO-Cr2O3계 폐내화물의 분쇄물에서 얻어진 크롬광은 사용하고자 하는 크롬광보다 Cr2O3함량이 5∼10 중량% 높은 크롬광 클링커로 제조된 MgO-Cr2O3계 폐내화물 중에서 변질층을 제외한 나머지 부위를 분쇄한 다음 비중이 높은 크롬광 입자만을 선별, 분리하여 건조 및 체분리하여 얻어지는 것인 공업용가열로의 내화물 도포용 무기계 내화도료.The method according to claim 2, wherein the chromium light obtained from the pulverized product of the MgO-Cr 2 O 3 -based waste refractory is a MgO-based clinker produced from a chromium optical clinker having a Cr 2 O 3 content of 5 to 10% Wherein the Cr 2 O 3 -based waste refractory is obtained by pulverizing the remaining portions except for the altered layer, and then, only the chrome light particles having a high specific gravity are selected, separated, dried and sieved to obtain an inorganic fireproof paint for refractory application in an industrial furnace.
KR10-2000-0086016A 2000-12-29 2000-12-29 Inorganic refractory paint having good heat emissivity KR100383101B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR10-2000-0086016A KR100383101B1 (en) 2000-12-29 2000-12-29 Inorganic refractory paint having good heat emissivity

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR10-2000-0086016A KR100383101B1 (en) 2000-12-29 2000-12-29 Inorganic refractory paint having good heat emissivity

Publications (2)

Publication Number Publication Date
KR20020058174A KR20020058174A (en) 2002-07-12
KR100383101B1 true KR100383101B1 (en) 2003-05-12

Family

ID=27689116

Family Applications (1)

Application Number Title Priority Date Filing Date
KR10-2000-0086016A KR100383101B1 (en) 2000-12-29 2000-12-29 Inorganic refractory paint having good heat emissivity

Country Status (1)

Country Link
KR (1) KR100383101B1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100580079B1 (en) 2004-12-22 2006-05-16 재단법인 포항산업과학연구원 Method of preparing ceramic thermal radiation coating material
KR101070509B1 (en) 2003-12-24 2011-10-05 재단법인 포항산업과학연구원 Method of preparing thermal radiation coating material from waste magnesia chrome brick
KR101072491B1 (en) * 2004-09-10 2011-10-11 재단법인 포항산업과학연구원 Method of preparing ceramic thermal radiation coating material
KR101238265B1 (en) 2010-12-21 2013-03-04 명지대학교 산학협력단 Tialite based brown pigments and preparation method thereof

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1617910A (en) * 2002-02-01 2005-05-18 姜东善 Heat emitting paint for application of inner wall of industrial furnace
KR20030078487A (en) * 2002-03-29 2003-10-08 이재춘 High Emissivity Coating Composition and Coated Vacuum Chamber
KR100526835B1 (en) * 2002-10-25 2005-11-08 강동선 Heat-emissive paint for the inner surfaces of industrial furnaces
US20050103232A1 (en) 2003-11-19 2005-05-19 Gadkaree Kishor P. Composition and method for making ceramic filters
KR100953827B1 (en) * 2008-04-25 2010-04-20 장동주 Watersoluble ceramic paint composition having improved heat-block quality at high temperature

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3940516A (en) * 1973-05-30 1976-02-24 Politechnika Slaska Im Wincentego Pstrowskiego Fireproof inorganic protective coating and the method of its production
JPS57209889A (en) * 1981-06-17 1982-12-23 Shinagawa Refractories Co Heat resistant composition
JPH01213374A (en) * 1988-02-22 1989-08-28 Yokohama Rubber Co Ltd:The Heat-resistant coating composition
JPH10316900A (en) * 1997-05-20 1998-12-02 Kikusui Kagaku Kogyo Kk Formation of refractory coating layer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3940516A (en) * 1973-05-30 1976-02-24 Politechnika Slaska Im Wincentego Pstrowskiego Fireproof inorganic protective coating and the method of its production
JPS57209889A (en) * 1981-06-17 1982-12-23 Shinagawa Refractories Co Heat resistant composition
JPH01213374A (en) * 1988-02-22 1989-08-28 Yokohama Rubber Co Ltd:The Heat-resistant coating composition
JPH10316900A (en) * 1997-05-20 1998-12-02 Kikusui Kagaku Kogyo Kk Formation of refractory coating layer

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101070509B1 (en) 2003-12-24 2011-10-05 재단법인 포항산업과학연구원 Method of preparing thermal radiation coating material from waste magnesia chrome brick
KR101072491B1 (en) * 2004-09-10 2011-10-11 재단법인 포항산업과학연구원 Method of preparing ceramic thermal radiation coating material
KR100580079B1 (en) 2004-12-22 2006-05-16 재단법인 포항산업과학연구원 Method of preparing ceramic thermal radiation coating material
KR101238265B1 (en) 2010-12-21 2013-03-04 명지대학교 산학협력단 Tialite based brown pigments and preparation method thereof

Also Published As

Publication number Publication date
KR20020058174A (en) 2002-07-12

Similar Documents

Publication Publication Date Title
KR100383101B1 (en) Inorganic refractory paint having good heat emissivity
KR100936163B1 (en) Refractories for industrial iron and steel
EP0670293B1 (en) Method for producing silica brick
JP2601129B2 (en) Alumina-chromia castable refractory and precast block using it
GB2159144A (en) Method of manufacturing refractory bodies or compositions
KR100481882B1 (en) MONOLITHIC REFRACTORIES UTILIZED SPENT Mg-Cr BRICK
EP3421571B1 (en) Precast refractory block for coke oven
US3585058A (en) Alumina-chrome refractories
JPH0687667A (en) Zirconia-mullite containing castable refractory
KR100481883B1 (en) PHOSPHATE COMBINED MONOLITHIC REFRACTORIES UTILIZED SPENT Mg-Cr BRICK
US20170081244A1 (en) Unshaped refractory material
CN1265161A (en) Flame-spraying powdery repair mixture
Borzov Development of low cement castables of the Al2O3–SiC–C system
JP4843414B2 (en) Raw material composition for chrome-based amorphous refractory material and refractory material using the same
KR100508522B1 (en) Al203-SiO2-ZrO2 castable with high tolerance
JP2001253765A (en) Magnesia-alumina-titania-based brick
KR100468448B1 (en) Mg-Cr castable composition with residual expansion
JPH11130551A (en) Spraying material for hot repair
JP3209842B2 (en) Irregular refractories
JPH05339065A (en) Casting material for blast furnace trough
JP6086751B2 (en) Refractory mortar
KR100240752B1 (en) Hot gunning repair material
KR100858125B1 (en) MgO refrectory castable
JP2765458B2 (en) Magnesia-carbon refractories
JPH08231264A (en) Production of basic refractory and the refractory

Legal Events

Date Code Title Description
A201 Request for examination
N231 Notification of change of applicant
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20130422

Year of fee payment: 11

FPAY Annual fee payment

Payment date: 20140423

Year of fee payment: 12

FPAY Annual fee payment

Payment date: 20150423

Year of fee payment: 13

FPAY Annual fee payment

Payment date: 20160425

Year of fee payment: 14

FPAY Annual fee payment

Payment date: 20170421

Year of fee payment: 15

FPAY Annual fee payment

Payment date: 20180420

Year of fee payment: 16

FPAY Annual fee payment

Payment date: 20190423

Year of fee payment: 17