JP4292332B2 - Insulating refractory composition for spraying - Google Patents
Insulating refractory composition for spraying Download PDFInfo
- Publication number
- JP4292332B2 JP4292332B2 JP24024999A JP24024999A JP4292332B2 JP 4292332 B2 JP4292332 B2 JP 4292332B2 JP 24024999 A JP24024999 A JP 24024999A JP 24024999 A JP24024999 A JP 24024999A JP 4292332 B2 JP4292332 B2 JP 4292332B2
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- JP
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- Prior art keywords
- spraying
- weight
- refractory composition
- heat
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- Legal status (The legal status 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 status listed.)
- Expired - Lifetime
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Classifications
-
- 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00482—Coating or impregnation materials
- C04B2111/00551—Refractory coatings, e.g. for tamping
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00482—Coating or impregnation materials
- C04B2111/00577—Coating or impregnation materials applied by spraying
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Ceramic Products (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Description
【０００１】
【産業上の利用分野】
本発明は、各種窯炉の炉壁，炉蓋等の内張り材として使用される吹付用耐火組成物に関し、特に、嵩比重が小さく、断熱性が良好でリバウンド・ロスが少ない吹付用耐火組成物に関する。
【０００２】
【従来の技術】
各種不定形耐火物の嵩比重を下げて断熱性を向上させるため、セラミックファイバーおよび蛭石が広く使用されている。
【０００３】
セラミックファイバーを使用した断熱キャスタブル耐火物あるいは吹付用耐火組成物の開示例としては特開昭５３−１２９２１０号，特開昭５７−７１８７８号，特開昭５９−１７４５７９号，特開昭６０−２４６２７３号，特開平１−２０３２７８号，特開平６−８７６６６号等がある。蛭石（バーミキュライト）を使用した軽量断熱キャスタブルについては特開昭５９−１７４５７９号に参考例として記載されているように古くから知られている。従来より断熱キャスタブル耐火物の結合材としてアルミナセメント，ρアルミナ，アルミナゾル，珪酸ソーダ等が使用されていたが、いずれが結合材であっても、セラミックファイバー又は蛭石の添加量に上限があって、充分な断熱性を示すものではなかった。従来より吹付材としての施工性と発現強度の維持のために、断熱質原料（セラミックファイバー又は蛭石）の他に相当量の耐火性骨材（アルミナ，ムライト，シャモット等）が併用されていた。断熱質原料の使用量が少ないため、嵩比重が大きく、熱伝導率が高いという問題があった。
【０００４】
【発明が解決しようとする課題】
そこで本発明においては上記の事情に鑑みて、リバウンド・ロスが少なく断熱性の良い吹付用耐火物を提供することを目的とする。
【０００５】
【課題を解決するための手段】
そのため、本発明の断熱性吹付用耐火組成物は、５〜３０重量部のセラミックファイバーと２０〜７０重量部の蛭石と２５〜６０重量部のアルミナセメントとの三者の合計が１００重量部となるように含有していることを特徴とする。
【０００６】
また、本発明の断熱性吹付用耐火組成物はアルミナセメントの一部をシリカフラワー及び／又はセピオライトに置換することを特徴とする。
【０００７】
更に本発明の断熱性吹付用耐火組成物は、前記組成物にＣＭＣを外配で０．０５〜２％添加したことを特徴とする。
【０００８】
更にまた、本発明の断熱性吹付用耐火組成物は、前記各組成物において、セラミックファイバーがロックウール粒状綿であることを特徴とする。
【０００９】
【作用】
本発明者は、いかなる耐火材料を用い、またその配合比率をどのようにすれば、嵩比重が小さく、断熱性が良好でリバウンド・ロスが少ない吹付用耐火組成物が得られるかについて、様々な実験，研究を重ねた結果、断熱質原料として、セラミックファイバーと蛭石を併用し、アルミナセメントを結合材とすることを知見し、本発明を完成させるに至ったのである。
【００１０】
即ち、不定形耐火物、特に吹付施工用耐火物にとって粒度調整が重要であるが、本発明においては、セラミックファイバーに対して蛭石を粗粒とみなして粒度調整を行ったものである。リバウンド・ロスを少なくするため、粒径１ｍｍ以上の蛭石（ＪＩＳ規格の３号）が１０重量％以上含まれることが必要である。
【００１１】
セラミックファイバーはアルミナ質，ムライト質，アルミナーシリカ質等のもの、あるいはロックウールが使用できる。繊維形状としては、いずれの場合も粒状綿がよい。セラミックファイバーと蛭石の配合比率は１対３くらいがよい。セラミックファイバーと蛭石の合計配合量は４０〜７０重量％が好ましい。４０重量％未満では、軽量性，断熱性に優れた吹付用耐火物が得にくくなる。また７０重量％を越えると、リバウンド・ロスが大きくなると共に施工体の強度が低くなりやすい。
【００１２】
アルミナセメントは、従来から使用されているもので、ＪＩＳ１種，２種およびアルミナ含量７０〜８５％のハイアルミナセメントを用いることができる。常温硬化性を付与するため、アルミナセメントは最低１５重量％必要である。逆に６０重量％以上では、断熱性が著しく低下する。
【００１３】
アルミナセメントの一部をシリカフラワー及び／又はセピオライトに置換すると吹付け時の水分調整が容易になると共にリバウンド・ロスが少なくなる。５〜１５重量％がシリカフラワー及び／又はセピオライトの好ましい添加量である。
【００１４】
吹付材の粘性向上、粉体と水の分離防止、吹付面での盛り上がり性改善のため、ＰＶＡ，ＭＣ，ＣＭＣ等の有機増粘剤の添加が有効である。ＣＭＣが最適であり、好ましい添加量は０．０５〜２重量％である。
【００１５】
ロックウールの粒状綿は他のセラミックファイバーにくらべて、蛭石と組み合わせ使用した時のリバウンド・ロスが少ない特徴がある。
【００１６】
【実施例】
表１は、本願発明の断熱性吹付用耐火組成物と従来品、および比較例の吹付耐火物について、それぞれの配合割合、物性を示すと共に、ローター式耐火物吹付機を使って行った吹付試験結果を説明するための表である。
【００１７】
表１に示す配合割合（重量％）で調合し、吹付実験を行った。ローター式吹付ガンを使用し、空気圧力３〜４ｋｇ／ｃｍ２で、垂直パネルに吹付けた。高さ１００ｍｍのＶ型アンカーを２００ｍｍピッチで溶接したパネルを使用した。
【００１８】
表１に示すように、本発明品は、吹付け施工時の粉じん発生が少なく、ノズルの先端からのたれが無く、息つぎせず、施工面でのだれも無く、総体的に吹付作業が容易であり、リバウンド・ロスも少なかった。なお、○と△と×で、それぞれの項目における評価の良い状態と普通の状態と悪い状態を示した。
【００１９】
表１に、本発明品と従来品と比較品の物性を示した。本発明品は従来品にくらべてカサ比重が明白に小さい。また、それに伴って熱伝導率も際立って低い値となっている。
【００２０】
線変化率と曲げ強さの値は従来品と同程度である。
【００２１】
【表１】
【発明の効果】
本発明により、カサ比重が小さく、熱伝導率が低い特性を有し、しかも吹付施工時の作業性が良い断熱性吹付用耐火組成物が得られたので、各種窯炉の炉壁，炉蓋のライニングに適用すると、作業環境の改善と省エネルギーに寄与できる。[0001]
[Industrial application fields]
The present invention relates to a refractory composition for spraying used as a lining material for furnace walls, furnace lids and the like of various kilns, and in particular, a refractory composition for spraying having a small bulk specific gravity, good heat insulation and low rebound loss. About.
[0002]
[Prior art]
Ceramic fibers and meteorites are widely used to reduce the bulk specific gravity of various amorphous refractories and improve heat insulation.
[0003]
Examples of the disclosure of heat insulating castable refractories or spraying refractory compositions using ceramic fibers are disclosed in JP-A-53-129210, JP-A-57-71878, JP-A-59-174579, JP-A-60-246273. No. 1, JP-A-1-203278, JP-A-6-87666, and the like. A lightweight heat-insulating castable using vermiculite has been known for a long time as described in Japanese Patent Application Laid-Open No. 59-174579 as a reference example. Conventionally, alumina cement, ρ-alumina, alumina sol, sodium silicate, etc. have been used as binders for heat-insulating castable refractories, but there is an upper limit to the amount of ceramic fiber or meteorite added, regardless of which is binder. It did not show sufficient heat insulation. Conventionally, a considerable amount of refractory aggregate (alumina, mullite, chamotte, etc.) has been used in addition to heat insulating material (ceramic fiber or meteorite) in order to maintain workability and expression strength as a spraying material. . Since the amount of the heat insulating material used is small, there is a problem that the bulk specific gravity is large and the thermal conductivity is high.
[0004]
[Problems to be solved by the invention]
Therefore, in view of the above circumstances, an object of the present invention is to provide a refractory for spraying with less rebound loss and good heat insulation.
[0005]
[Means for Solving the Problems]
Therefore, the heat-resistant composition for spraying according to the present invention has a total of 100 parts by weight of three parts of 5 to 30 parts by weight of ceramic fiber, 20 to 70 parts by weight of meteorite and 25 to 60 parts by weight of alumina cement. It is contained so that it may become.
[0006]
Moreover, the fireproof composition for thermal spraying of the present invention is characterized in that a part of the alumina cement is replaced with silica flour and / or sepiolite.
[0007]
Furthermore, the refractory composition for thermal spraying of the present invention is characterized in that 0.05 to 2% of CMC is externally added to the composition.
[0008]
Furthermore, the fireproof composition for thermal spraying according to the present invention is characterized in that in each of the compositions, the ceramic fiber is rock wool granular cotton.
[0009]
[Action]
The inventor uses various refractory materials and how the blending ratio is used to obtain various refractory compositions for spraying that have a low bulk specific gravity, good heat insulation, and low rebound loss. As a result of repeated experiments and researches, it was found that ceramic fibers and meteorites were used in combination as a heat insulating material and alumina cement was used as a binder, and the present invention was completed.
[0010]
That is, the particle size adjustment is important for the irregular refractory, particularly for the refractory for spray construction, but in the present invention, the particle size is adjusted by regarding the ceramic fiber as coarse particles. In order to reduce rebound loss, it is necessary that 10% by weight or more of meteorite having a particle size of 1 mm or more (JIS standard No. 3) is contained.
[0011]
The ceramic fiber may be alumina, mullite, alumina-silica, or rock wool. As a fiber shape, granular cotton is good in any case. The mixing ratio of ceramic fiber and meteorite should be about 1 to 3. The total amount of the ceramic fiber and the meteorite is preferably 40 to 70% by weight. If it is less than 40% by weight, it becomes difficult to obtain a refractory for spraying excellent in lightness and heat insulation. On the other hand, if it exceeds 70% by weight, the rebound loss increases and the strength of the construction body tends to decrease.
[0012]
Alumina cement is conventionally used, and high-alumina cement having JIS types 1 and 2 and alumina content of 70 to 85% can be used. In order to impart room temperature curability, the alumina cement needs to be at least 15% by weight. On the other hand, if it is 60% by weight or more, the heat insulating property is remarkably lowered.
[0013]
Replacing a part of the alumina cement with silica flour and / or sepiolite facilitates moisture adjustment during spraying and reduces rebound loss. 5 to 15% by weight is a preferable addition amount of silica flour and / or sepiolite.
[0014]
Addition of organic thickeners such as PVA, MC, and CMC is effective for improving the viscosity of the spray material, preventing separation of powder and water, and improving the swell of the spray surface. CMC is optimal and the preferred addition amount is 0.05 to 2% by weight.
[0015]
Rock wool granular cotton is characterized by less rebound loss when used in combination with meteorites compared to other ceramic fibers.
[0016]
【Example】
Table 1 shows the blending ratio and physical properties of the heat-insulating spraying refractory composition of the present invention, the conventional product, and the comparative spraying refractories, and the spraying test conducted using a rotor-type refractory spraying machine. It is a table | surface for demonstrating a result.
[0017]
Formulation was performed at a blending ratio (% by weight) shown in Table 1, and a spraying experiment was performed. Using a rotor type spray gun, the vertical panel was sprayed at an air pressure of 3 to 4 kg / cm 2 . A panel in which V-shaped anchors having a height of 100 mm were welded at a pitch of 200 mm was used.
[0018]
As shown in Table 1, the product of the present invention generates less dust during spraying, there is no sagging from the tip of the nozzle, no breathing, no dripping on the construction surface, and overall spraying work It was easy and there was little rebound loss. In addition, (circle), (triangle | delta), and x showed the state with a favorable evaluation in each item, a normal state, and a bad state.
[0019]
Table 1 shows the physical properties of the product of the present invention, the conventional product, and the comparative product. The product of the present invention has a clearly smaller specific gravity than the conventional product. Along with this, the thermal conductivity is also markedly low.
[0020]
The values of the line change rate and bending strength are comparable to the conventional products.
[0021]
[Table 1]
【The invention's effect】
According to the present invention, a heat insulating refractory composition for spraying has been obtained that has low bulk density, low thermal conductivity, and good workability during spraying. When applied to the lining, it can contribute to improvement of work environment and energy saving.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24024999A JP4292332B2 (en) | 1999-07-23 | 1999-07-23 | Insulating refractory composition for spraying |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24024999A JP4292332B2 (en) | 1999-07-23 | 1999-07-23 | Insulating refractory composition for spraying |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001039775A JP2001039775A (en) | 2001-02-13 |
| JP4292332B2 true JP4292332B2 (en) | 2009-07-08 |
Family
ID=17056688
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24024999A Expired - Lifetime JP4292332B2 (en) | 1999-07-23 | 1999-07-23 | Insulating refractory composition for spraying |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4292332B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110746199A (en) * | 2019-12-12 | 2020-02-04 | 中海润达新材料股份有限公司 | Method for manufacturing multi-cavity-hole ceramic composite heat-insulating material |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100491123B1 (en) * | 2002-08-17 | 2005-05-25 | 주식회사 포스코 | High intensity castable refractories with good adiabatic and high thermal shock resistance |
| JP5509016B2 (en) * | 2010-09-28 | 2014-06-04 | 品川リフラクトリーズ株式会社 | Lightweight insulation castable |
| KR101465336B1 (en) * | 2013-05-24 | 2014-11-25 | 현대중공업 주식회사 | Spray mortar insulation for engine room, deck house wall and pipe in all vessel |
| CN111499400B (en) * | 2020-04-27 | 2022-04-19 | 河南省宏达炉业有限公司 | High-strength low-rebound fireproof spray coating and preparation method thereof |
-
1999
- 1999-07-23 JP JP24024999A patent/JP4292332B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110746199A (en) * | 2019-12-12 | 2020-02-04 | 中海润达新材料股份有限公司 | Method for manufacturing multi-cavity-hole ceramic composite heat-insulating material |
| CN110746199B (en) * | 2019-12-12 | 2021-09-28 | 中海润达新材料股份有限公司 | Method for manufacturing multi-cavity-hole ceramic composite heat-insulating material |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2001039775A (en) | 2001-02-13 |
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Free format text: JAPANESE INTERMEDIATE CODE: R250 |
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| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
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| EXPY | Cancellation because of completion of term |