JPH1045479A - Slip casting refractory material composition - Google Patents
Slip casting refractory material compositionInfo
- Publication number
- JPH1045479A JPH1045479A JP19935996A JP19935996A JPH1045479A JP H1045479 A JPH1045479 A JP H1045479A JP 19935996 A JP19935996 A JP 19935996A JP 19935996 A JP19935996 A JP 19935996A JP H1045479 A JPH1045479 A JP H1045479A
- Authority
- JP
- Japan
- Prior art keywords
- weight
- refractory
- fine powder
- compsn
- composition
- Prior art date
- 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.)
- Pending
Links
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
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Ceramic Products (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、自己流動性を有す
るとともに、杯土の流し込み施工に際して杯土表層に分
離層を生じない、耐熱衝撃性に優れた流し込み耐火物用
組成物に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composition for a cast refractory having excellent thermal shock resistance, which has a self-flowing property and does not form a separation layer on the surface layer of the fill during casting of the fill.
【０００２】[0002]
【従来の技術】アルミナセメントの含有量が少ない低セ
メント系流し込み耐火物は、施工箇所に混練杯土を流し
込み、次いでバイブレータで杯土に振動を加えて杯土の
流動性を高めて流し込み施工している。流し込み耐火物
の実用特性は、杯土が施工箇所の隅々に行きわたり、か
つ杯土中の気泡が浮上して緻密な組織の耐火物を充填が
できるかどうかによって左右される。2. Description of the Related Art A low-cement cast refractory having a low alumina cement content is prepared by pouring kneaded clay into a construction site, and then vibrating the clay with a vibrator to increase the fluidity of the clay. ing. The practical properties of cast refractories depend on whether the fill fills every corner of the construction site and whether bubbles in the fill fill up and fill the refractory with a dense structure.
【０００３】バイブレータで杯土に振動を加えることが
難しい複雑な形状を有する施工箇所に流し込み耐火物を
流し込むことは困難である。また、杯土に振動を加える
施工作業はそれ自体相当な労力を必要とする。最近は、
流し込み耐火物の施工作業を省力化するため、振動を与
えなくても施工可能な自己流動性を有する流し込み耐火
物が開発され、実用に供され始めている。[0003] It is difficult to pour a refractory into a construction site having a complicated shape in which it is difficult to apply vibration to the clay with a vibrator. In addition, the construction work of applying vibration to the cover soil itself requires considerable labor. Nowadays,
In order to save labor for construction work of cast refractories, cast refractories having self-fluidity which can be constructed without giving vibrations have been developed and are beginning to be put to practical use.
【０００４】しかし、自己流動性を有する従来の流し込
み用耐火物には、流動性を高めるために微粉が多量に配
合されていて加熱収縮が大きく、耐熱衝撃性が小さいと
いう問題がある。この問題を解消する対策として、微粉
の配合量を減らして耐熱衝撃性を向上させることが考え
られる。しかし、微粉の配合量が少ないと流動性が低下
するだけでなく、耐火物の流し込み施工時に微粉を多く
含む杯土が施工体の表層に移動して分離層を生じる。分
離層を生じると、耐火物が不均一化して耐火物の特性が
劣化する他、耐火物杯土を打ち継ぎ施工すると、分離層
が打ち継いだ境界にできてこの分離層の箇所で耐火物に
亀裂が入るという問題がある。However, the conventional casting refractories having a self-flowing property have a problem that a large amount of fine powder is blended in order to enhance the flowability, so that heat shrinkage is large and thermal shock resistance is small. As a countermeasure to solve this problem, it is conceivable to improve the thermal shock resistance by reducing the blending amount of the fine powder. However, when the blending amount of the fine powder is small, not only the fluidity is reduced, but also at the time of pouring the refractory, the clay containing a large amount of the fine powder moves to the surface layer of the construction body to form a separation layer. When a separation layer is formed, the refractory becomes non-uniform and the characteristics of the refractory deteriorate.In addition, when the refractory bedding is pierced, the refractory is formed at the boundary where the separation layer is connected and the refractory There is a problem that cracks are formed.
【０００５】[0005]
【発明が解決しようとする課題】本発明の目的は、良好
な自己流動性を確保するとともに、微粉の配合量を少な
くしても分離層を生じず、耐熱衝撃性が良好で加熱収縮
が小さい流し込み用耐火物を提供することにある。SUMMARY OF THE INVENTION It is an object of the present invention to ensure good self-flowability and to prevent formation of a separation layer even with a small amount of fine powder, good thermal shock resistance and low heat shrinkage. To provide a refractory for pouring.
【０００６】[0006]
【課題を解決するための手段】本発明の流し込み耐火物
用組成物は、耐火性骨材を７７〜９５重量％と、耐火性
粉末として、アルミナセメント０．５〜５重量％、アル
ミナ微粉２〜５重量％、ヒュームドシリカ微粉３〜８重
量％を含み、リン酸ソーダ０．０２〜０．５重量％と、
ナフタレンスルホン酸ホルムアルデヒド縮合物ナトリウ
ム０．０２〜０．５重量％とからなる組成物であって、
該組成物中に含まれる粒径１０μｍ以下の微粉の含有量
が８〜２３重量％であり、該組成物１００重量部に対し
て８重量部の水を加えて混練した直後の杯土を、水平な
板面上に置いた上部内径５０ｍｍ、底部内径１００ｍ
ｍ、高さ１５０ｍｍのコーン型に流し込んで充たし、該
コーン型を上方に抜き取って振動を加えないで６０秒間
静置したときの杯土の拡がり直径が１６５ｍｍ以上であ
ることを特徴とする。The composition for a cast refractory of the present invention comprises 77 to 95% by weight of a refractory aggregate, 0.5 to 5% by weight of alumina cement as a refractory powder, and 2 parts of alumina fine powder. -5% by weight, fumed silica fine powder 3-8% by weight, sodium phosphate 0.02-0.5% by weight,
A composition comprising 0.02-0.5% by weight of sodium naphthalenesulfonic acid formaldehyde condensate,
The content of the fine powder having a particle size of 10 μm or less contained in the composition is 8 to 23% by weight, and the clay immediately after kneading by adding 8 parts by weight of water to 100 parts by weight of the composition, Top inside diameter 50mm, bottom inside diameter 100m placed on a horizontal plate surface
m, a cone having a height of 150 mm, which is filled with the cone, withdrawn upward, and allowed to stand for 60 seconds without application of vibration, and the spread diameter of the cover soil is 165 mm or more.
【０００７】本発明において、耐火性骨材は、流し込み
耐火物に耐熱性や耐食性を付与する耐火物の主要な成分
である。耐火性骨材としては、粒径３０μｍ超のものを
使用し、高い充填密度が得られる粒度分布を有するもの
がよく、予め粗粒、中粒及び細粒に分級した耐火性骨材
を、高い充填密度が得られるように再調合したものを使
用するのが好ましい。耐火性骨材の充填密度を高くでき
れば、耐火性粉末と杯土に自己流動性を付与するのに必
要な混合水の量を少なくでき、耐火物特性にも優れた高
い嵩比重を有する流し込み耐火物が得られる。In the present invention, the refractory aggregate is a main component of the refractory that imparts heat resistance and corrosion resistance to the cast refractory. As the refractory aggregate, those having a particle size of more than 30 μm are preferably used, and those having a particle size distribution capable of obtaining a high packing density are preferable.The refractory aggregate previously classified into coarse particles, medium particles and fine particles is preferably used. It is preferred to use one reconstituted to obtain a packing density. If the packing density of the refractory aggregate can be increased, the amount of mixed water necessary to impart self-fluidity to the refractory powder and the bedding can be reduced, and the cast refractory having a high bulk specific gravity with excellent refractory properties. Things are obtained.
【０００８】耐火性骨材の配合量は、組成物中において
軽量基準で、７７〜９５重量％である。The amount of the refractory aggregate is 77 to 95% by weight in the composition on a light weight basis.
【０００９】耐火性骨材としては、アルミナ、ボーキサ
イト、ムライト、バン土頁岩、シャモット、シリマナイ
ト、アンダリューサイト、珪石、クロム鉱石、スピネ
ル、マグネシア、ジルコニア、ジルコン、クロミア、窒
化珪素、窒化アルミニウム、炭化珪素、炭化硼素、硼化
ジルコニウム及び硼化チタンから選ばれる１種以上が好
ましく使用できる。Examples of the refractory aggregate include alumina, bauxite, mullite, ban shale, chamotte, sillimanite, andalusite, silica, chromium ore, spinel, magnesia, zirconia, zircon, chromia, silicon nitride, aluminum nitride, and carbonized carbon. One or more selected from silicon, boron carbide, zirconium boride and titanium boride can be preferably used.
【００１０】なかでも、本発明の効果が良好であり、耐
火度が高く、コストパフォーマンスに優れ、広範な用途
があることから、アルミナ、ボーキサイト、ムライト、
バン土頁岩、シリマナイト及びアンダリューサイトから
選ばれる１種以上のＡｌ2 Ｏ3 を主成分、好ましくはＡ
ｌ2 Ｏ3 成分を６０重量％以上含む耐火性骨材を使用す
るのが好ましい。[0010] Among them, alumina, bauxite, mullite,
One or more Al 2 O 3 selected from ban shale, sillimanite, and andalusite as main components, preferably A
It is preferable to use a refractory aggregate containing 60% by weight or more of the l 2 O 3 component.
【００１１】耐火性粉末は、耐火性骨材の粒子間の隙間
を埋めて耐火性骨材間を結合し、耐火物に結合強度を付
与する成分である。本発明の組成物中の耐火性粉末がア
ルミナセメントを含むものであるので、流し込み施工さ
れた耐火物は、硬化後常温から耐火物が使用される高温
までの間で実用性のある強度を保持する。実用的で良好
な施工体強度が得られるように、アルミナセメントは組
成物中に０．５〜５重量％、特には１〜４重量％含むも
のとするのが好ましい。The refractory powder is a component that fills the gaps between the particles of the refractory aggregate and bonds the refractory aggregates to each other, and gives the refractory a bonding strength. Since the refractory powder in the composition of the present invention contains alumina cement, the cast refractory maintains practical strength from room temperature after curing to a high temperature at which the refractory is used. The alumina cement is preferably contained in the composition in an amount of 0.5 to 5% by weight, particularly 1 to 4% by weight, so that practical and good strength of the construction body can be obtained.
【００１２】しかし、耐火性粉末の配合量が多いとその
乾燥時と使用時に耐火物が収縮して亀裂が入りやすく、
耐熱衝撃性が小さくなるので、組成物中の粒径１０μｍ
以下の微粉の含有量を２３重量％以下としている。組成
物中の１０μｍ以下の微粉の含有量は好ましくは２０重
量％以下である。また、組成物中の粒径１０μｍ以下の
微粉は耐火物に結合強度を付与するため８重量％以上必
要である。However, if the amount of the refractory powder is large, the refractory shrinks during drying and use, and cracks easily occur.
Since the thermal shock resistance is reduced, the particle size in the composition is 10 μm
The content of the following fine powder is set to 23% by weight or less. The content of fine powder of 10 μm or less in the composition is preferably 20% by weight or less. Fine powder having a particle size of 10 μm or less in the composition is required to be 8% by weight or more in order to impart bonding strength to the refractory.
【００１３】耐火性粉末には、上述したアルミナセメン
トの他にヒュームドシリカ、バイヤーアルミナなどのア
ルミナ、チタニア、ムライト、シャモット、スピネル、
マグネシア、ジルコニア、ジルコン、クロミア、窒化珪
素、窒化アルミニウム、炭化珪素、硼化ジルコニウム及
び硼化チタンから選ばれる１種以上の粉末が好ましく使
用できる。The refractory powders include, in addition to the above-mentioned alumina cement, fumed silica, alumina such as Bayer alumina, titania, mullite, chamotte, spinel,
One or more powders selected from magnesia, zirconia, zircon, chromia, silicon nitride, aluminum nitride, silicon carbide, zirconium boride and titanium boride can be preferably used.
【００１４】これらの耐火性粉末のうち、ヒュームドシ
リカは一般的に平均粒径が１μｍ程度であり、その配合
は杯土の流動性を向上させる効果がある。このため、ヒ
ュームドシリカを組成物中に好ましくは３重量％以上配
合する。しかし、あまり多くヒュームドシリカを配合す
ると耐火物の耐火度が低下して耐食性が損なわれ、施工
体の加熱収縮が大きくなるのでヒュームドシリカの配合
量は８重量％以下とするのが好ましい。Among these refractory powders, fumed silica generally has an average particle size of about 1 μm, and its blending has the effect of improving the fluidity of the clay. For this reason, fumed silica is preferably added to the composition in an amount of 3% by weight or more. However, if too much fumed silica is added, the refractory of the refractory decreases in its fire resistance and the corrosion resistance is impaired, and the heat shrinkage of the construction increases, so that the amount of the fumed silica is preferably 8% by weight or less.
【００１５】また、耐火性粉末の一部としてバイヤーア
ルミナなどのアルミナ微粉を配合すると、良好な自己流
動性が安定して得られる。バイヤーアルミナは、バイヤ
ー法により得られるもので、一般的には平均粒径５μｍ
程度の微粉であり、自己流動性を有する経済的にも有利
なアルミナ微粉である。バイヤーアルミナは組成物中に
２〜５重量％配合するのが好ましい。When a fine alumina powder such as Bayer alumina is blended as a part of the refractory powder, a good self-flow property can be obtained stably. Bayer alumina is obtained by the Bayer method, and generally has an average particle size of 5 μm.
Alumina fine powder having a self-fluidity and being economically advantageous. Bayer alumina is preferably incorporated in the composition in an amount of 2 to 5% by weight.
【００１６】また、組成物中のアルミナ微粉、アルミナ
セメント及びヒュームドシリカを合わせた含有量は、良
好な自己流動性が安定して得られるように、１３重量％
以下とするのが好ましい。The total content of alumina fine powder, alumina cement and fumed silica in the composition is 13% by weight so that good self-flowability can be obtained stably.
It is preferable to set the following.
【００１７】各種リン酸ソーダとしては、少量の添加で
良好な流動性を有する杯土が得られることから、ヘキサ
メタリン酸ソーダ、テトラポリリン酸ソーダ、トリポリ
リン酸ソーダ、ウルトラポリリン酸ソーダ、ピロリン酸
ソーダ、無水ピロリン酸ソーダから選ばれる１種以上を
使用するのが好ましい。これらはあまり多く配合しても
分散効果はそれ以上向上しないので、組成物１００重量
％に対して、０．０２〜０．５重量％配合するのが好ま
しい。As various sodium phosphates, a clay having good fluidity can be obtained by adding a small amount of sodium phosphate, so that sodium hexametaphosphate, sodium tetrapolyphosphate, sodium tripolyphosphate, sodium ultrapolyphosphate, sodium pyrophosphate, It is preferable to use one or more selected from anhydrous sodium pyrophosphate. Since the dispersing effect is not further improved even if these are added in too much amount, it is preferable to add 0.02 to 0.5% by weight based on 100% by weight of the composition.
【００１８】ナフタレンスルホン酸ホルムアルデヒド縮
合物ナトリウムは、下記化１に示す一般構造式からなる
ものである。The sodium naphthalene sulfonic acid formaldehyde condensate has the general structural formula shown in the following chemical formula 1.
【００１９】[0019]
【化１】 Embedded image
【００２０】ナフタレンスルホン酸ホルムアルデヒド縮
合物ナトリウムは、これを配合しないと流し込み施工し
た耐火物施工体の表層に分離層が生じ、多く配合しても
分離抑制効果はそれ以上向上しないので、組成物中０．
０２〜０．５重量％配合するのが好ましい。Unless sodium naphthalene sulfonic acid formaldehyde condensate is added, a separation layer is formed on the surface of the cast refractory construction body. Even if a large amount of sodium is added, the effect of suppressing separation is not further improved. 0.
It is preferable to add 02 to 0.5% by weight.
【００２１】なお、上記一般式において、本発明で望ま
しいものは、β−ナフタレンスルホン酸ホルムアルデヒ
ド縮合物ナトリウムであり、ｎは通常１０以上の高分子
量のものが適当である。In the above-mentioned general formula, what is desirable in the present invention is β-naphthalenesulfonic acid formaldehyde condensate sodium, and n is usually suitable to have a high molecular weight of 10 or more.
【００２２】上記の構成を有する本発明の組成物１００
重量％に対して８重量部の水を加えて混練した杯土は、
型枠内に流し込むと振動を与えなくても型枠の隅々まで
流入して型枠内を充填し、杯土内部にある気泡を表面に
浮上させて排除する自己流動性を有する。杯土の流動性
の評価は、本発明では次の方法によって評価する。The composition 100 of the present invention having the above constitution
The kokudo kneaded by adding 8 parts by weight of water to the weight%,
When it is poured into the mold, it has a self-fluidity that flows into every corner of the mold and fills the mold without vibrating without applying vibration, and air bubbles inside the clay are floated to the surface and eliminated. In the present invention, the fluidity of the fill is evaluated by the following method.
【００２３】すなわち、組成物に８重量％の水を加えて
混練した直後の杯土を、水平な板面上に置いた上部内径
５０ｍｍ、底部内径１００ｍｍ、高さ１５０ｍｍのコー
ン型（円錐台形状の上下を打ち抜いた型）に流し込んで
みたし、該コーン型を上方に抜き取って振動を与えない
で６０秒間静置し、板面上に自己流動させたときの杯土
の拡がり直径を、互いに直交する２方向についてノギス
で測定し、その平均値（以下フロー値と呼ぶ）を流動性
の指標とする。振動を与えることなく施工できる自己流
動性流し込み耐火物の杯土のフロー値は１６５ｍｍ以
上、好ましくは１８０ｍｍ以上である。That is, the clay immediately after kneading by adding 8% by weight of water to the composition is placed in a cone shape (top frustoconical shape) having a top inner diameter of 50 mm, a bottom inner diameter of 100 mm, and a height of 150 mm placed on a horizontal plate surface. The upper and lower sides of the cone were punched out), the cone was pulled upward, allowed to stand for 60 seconds without applying vibration, and the spreading diameter of the cover soil when self-flowing on the plate surface was measured. Measurement is made with a vernier caliper in two orthogonal directions, and the average value (hereinafter referred to as a flow value) is used as a liquidity index. The flow value of the clay of the self-flowing refractory that can be constructed without giving vibration is 165 mm or more, preferably 180 mm or more.
【００２４】杯土のフロー値は、杯土に混合されている
水の量が多いとより大きくなる。水の混合量が同じであ
れば、流動性が大きい方が施工性がよく、本発明組成物
において特に好ましい杯土のフロー値は２００ｍｍ以上
である。フロー値の測定は室温約２０℃の室内におい
て、室温とほぼ同じ温度の水を使用して行い、混練後３
分以内に終わらせる。良好な自己流動性を有する本発明
による流し込み耐火物の杯土を流し込み施工するとき
は、杯土に振動を与える重労働を伴う作業を全く必要と
せず、ポンプを用いて混練した杯土を施工現場へ搬送す
る施工方法を採用すれば、さらなる省力化が可能であ
る。[0024] The flow value of the fill is greater when the amount of water mixed in the fill is greater. If the mixing amount of water is the same, the greater the fluidity, the better the workability, and the particularly preferred flow value of the clay in the composition of the present invention is 200 mm or more. The flow value was measured in a room having a room temperature of about 20 ° C. using water having substantially the same temperature as the room temperature.
End in less than a minute. When pouring in the refractory pavement of the present invention having good self-flowing property, no work involving heavy labor for shaking the pavement is required at all, and the kneaded pavement using a pump is used at the construction site. By adopting the construction method of transferring to, further labor saving is possible.
【００２５】本発明の組成物に水を加えて混練した杯土
では、前述のナフタレンスルホン酸ホルムアルデヒド縮
合物ナトリウムを含むことによって組成物中に含まれる
粒径１０μｍ以下の微粉の量が２３重量％以下と少ない
にもかかわらず、流し込み施工する際に施工体の表層に
分離層を生じず、施工体は均質である。分離層は流し込
まれた杯土の表層に杯土中の細かい粒子からなるため、
その部分の乾燥時と使用時における収縮率が大きく、分
離層が生じた杯土の上に継ぎ足し施工すると、境界にあ
る分離層の部分で亀裂が発生するほか、分離層の部分の
耐食性が小さいため耐火物全体としての耐食性が損なわ
れる。In the clay obtained by adding water to the composition of the present invention and kneading, the amount of fine powder having a particle size of 10 μm or less contained in the composition is 23% by weight by containing the above-mentioned sodium naphthalenesulfonate formaldehyde condensate. Despite being as small as the following, there is no separation layer on the surface layer of the construction body during casting, and the construction body is homogeneous. Since the separation layer consists of fine particles in the clay on the surface of the poured clay,
The shrinkage rate during drying and use of that part is large, and when added to the clay covered with the separation layer, cracks will occur at the boundary of the separation layer and the corrosion resistance of the separation layer will be low Therefore, the corrosion resistance of the entire refractory is impaired.
【００２６】本発明の流し込み耐火物では、組成物中に
含まれる粒径１０μｍ以下の微粉の量が２３重量％以下
と少ないため、耐熱衝撃性が良好で、施工された耐火物
の乾燥時と使用時における寸法収縮が小さく、亀裂が発
生しにくい。また、混合する水の量が少ないので、施工
体が緻密になって耐食性などの耐火物特性に優れてい
る。In the cast refractory of the present invention, the amount of the fine powder having a particle size of 10 μm or less contained in the composition is as small as 23% by weight or less, so that the thermal shock resistance is good and the applied refractory can be dried when dried. Dimensional shrinkage during use is small, and cracks are unlikely to occur. Further, since the amount of water to be mixed is small, the construction body is dense and has excellent refractory properties such as corrosion resistance.
【００２７】[0027]
【実施例】以下本発明を実施例によって具体的に説明す
るが、本発明は以下の実施例によってなんら限定される
ものではない。EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to the following examples.
【００２８】流し込み耐火物の主要成分である耐火性骨
材には、Ａｌ2 Ｏ3 を４３重量％含むシャモット質骨材
の粗大粒（粒径８〜５ｍｍ）、粗粒（粒径４〜１．６８
ｍｍ）及び中粒（粒径１．６８ｍｍ以下）、Ａｌ2 Ｏ3
を８８重量％含むボーキサイト質骨材の細粒（粒径０．
０４３ｍｍ以下、粒径１０μｍ以下の粒子を３０重量％
含む）、Ａｌ2 Ｏ3 を６０重量％含むバン土頁岩質骨材
の粗粒（粒径５〜１ｍｍ）及び中粒（粒径１ｍｍ以
下）、Ａｌ2 Ｏ3 を９８重量％含む電融アルミナ質骨材
の粗粒（粒径５〜１ｍｍ）及び中粒（粒径１ｍｍ以下）
を使用した。The refractory aggregate, which is a main component of the cast refractory, includes coarse particles (grain size of 8 to 5 mm) and coarse particles (grain size of 4-1) of chamotte aggregate containing 43% by weight of Al 2 O 3. .68
mm) and medium grains (particle size of 1.68 mm or less), Al 2 O 3
Of bauxite aggregate containing 88% by weight of
043 mm or less, particles having a particle size of 10 μm or less are 30% by weight.
Including), Al 2 coarse (particle size 5~1mm of alum shale protein aggregate O 3 and containing 60% by weight) and Chutsubu (particle diameter 1mm or less), fused alumina containing Al 2 O 3 98 wt% Coarse grain (grain size 5 to 1 mm) and medium grain (grain size 1 mm or less)
It was used.
【００２９】耐火性粉末には、Ａｌ2 Ｏ3 を９９．６重
量％含むバイヤーアルミナ粉末（平均粒子径４．３μ
ｍ、粒径１０μｍ以下の粒子を９５重量％含む）、Ｓｉ
Ｏ2 を９３重量％含むヒュームドシリカ（平均粒径０．
８μｍ、粒径１０μｍ以下の粒子を９５重量％含む）及
びＡｌ2 Ｏ3 ７２．５重量％とＣａＯ ２６重量％とを
含むアルミナセメント（平均粒径５．６μｍ、粒径１０
μｍ以下の粒子を６０重量％含む）を使用した。As the refractory powder, Bayer alumina powder containing 99.6% by weight of Al 2 O 3 (average particle diameter of 4.3 μm) was used.
m, containing 95% by weight of particles having a particle size of 10 μm or less), Si
Fumed silica containing 93% by weight of O 2 (average particle size of 0.
Alumina cement containing 72.5% by weight of Al 2 O 3 and 26% by weight of CaO (having an average particle size of 5.6 μm and a particle size of 10 μm).
(including 60% by weight of particles having a particle size of μm or less).
【００３０】リン酸ソーダには、Ｐ2 Ｏ5 ５７．９重
量％とＮａ2 Ｏ ４２．１重量％とを含むトリポリリン
酸ナトリウムを使用した。As the sodium phosphate, sodium tripolyphosphate containing 57.9% by weight of P 2 O 5 and 42.1% by weight of Na 2 O was used.
【００３１】ナフタレンスルホン酸ホルムアルデヒド縮
合物ナトリウムとしては、β−ナフタレンスルホン酸ホ
ルムアルデヒド縮合物を使用した。As the sodium naphthalenesulfonic acid formaldehyde condensate, a β-naphthalenesulfonic acid formaldehyde condensate was used.
【００３２】これらの原料を表１に示した調合割合（記
載のない調合量はいずれも重量％）で調合した例１〜８
組成物（例１、６、７は実施例、例２〜５、８は比較
例）を調製し、同じく表１に記載した量の水を組成物に
混合して杯土とし、前述の方法によって、気温約２０℃
の室内で（使用した水の温度も気温とほぼ同じ）杯土の
流動性を評価した。Examples 1 to 8 in which these raw materials were blended at the blending ratios shown in Table 1 (the blending amounts not described are all by weight).
Compositions (Examples 1, 6, and 7 are Examples, Examples 2 to 5 and 8 are Comparative Examples) were prepared, and water was mixed with the composition in the same amount as described in Table 1 to obtain a clay, and the method described above was used. Depending on the temperature, about 20 ℃
The fluidity of the clay was evaluated in the room (the temperature of the used water was almost the same as the temperature).
【００３３】また、流し込み耐火物施工後の分離層の有
無については、混練直後の杯土を内径１００ｍｍ、高さ
２００ｍｍの型に流し込んで充たし、２４時間静置後耐
火物を型から取り出してその表層の分離層の厚さを測定
した。なお、表１に示した粒径１０μｍ以下の微粉の量
は、骨材の細粒中にも１０μｍ以下の粒子が含まれてい
るため、各調合原料中に含まれる１０μｍ以下の微粉の
量から計算で求めた。Regarding the presence or absence of a separation layer after the casting of the refractory, the clay immediately after kneading was poured into a mold having an inner diameter of 100 mm and a height of 200 mm, and the refractory was taken out from the mold after standing for 24 hours. The thickness of the surface separation layer was measured. In addition, the amount of the fine powder having a particle diameter of 10 μm or less shown in Table 1 is based on the amount of the fine powder having a particle diameter of 10 μm or less contained in each prepared raw material because the fine particles of the aggregate also include the particles of 10 μm or less. It was calculated.
【００３４】耐熱衝撃性の評価は、各組成物の杯土を型
に流し込み、２４時間後に型から外して１１０℃で２４
時間乾燥後１０００℃で３時間加熱して得られた寸法が
１００ｍｍ×２３０ｍｍ×６５ｍｍの試験片で実施し
た。すなわち、試験片の片側を１４００℃に加熱後水中
急冷するＤＩＮ−Ｅ５１０６７の方法に準拠して評価し
た。試験結果は、試験片の最初の重量の５重量％が欠落
したときの水中急冷した回数で示した。例１〜７の試験
片ではいずれも３０回超の耐熱衝撃性を示したのに対
し、１０μｍ以下の微粉を多く含む従来の流し込み耐火
物の例８では５回であった。表１の結果から、微粉の配
合量が少なく、β−ナフタレンスルホン酸ホルムアルデ
ヒド縮合物ナトリウムを含まない例３、４では、杯土の
表層に分離層を生じ、微粉の配合量が多い例８では分離
層を生じないが、耐熱衝撃性に劣ることがわかる。The thermal shock resistance was evaluated by pouring the clay of each composition into a mold, removing the mold after 24 hours and removing the mold at 110 ° C. for 24 hours.
After drying for an hour and heating at 1000 ° C. for 3 hours, the test was performed on a test piece having a size of 100 mm × 230 mm × 65 mm. That is, evaluation was performed in accordance with the method of DIN-E51067 in which one side of the test piece was heated to 1400 ° C. and then rapidly cooled in water. The test results were expressed as the number of times of rapid cooling in water when 5% by weight of the initial weight of the test piece was missing. The test pieces of Examples 1 to 7 all exhibited a thermal shock resistance of more than 30 times, whereas the test pieces of the conventional cast refractory containing a large amount of fine powder of 10 µm or less had 5 times. From the results shown in Table 1, in Examples 3 and 4 in which the amount of the fine powder was small and the sodium β-naphthalenesulfonic acid formaldehyde condensate was not included, a separation layer was formed on the surface layer of the clay, and in Example 8 in which the amount of the fine powder was large, Although no separation layer is formed, it is understood that the thermal shock resistance is poor.
【００３５】[0035]
【表１】 [Table 1]
【００３６】[0036]
【発明の効果】本発明の流し込み耐火物用組成物は、良
好な自己流動性を有するとともに、打ち継ぎ施工しても
分離層を生じず、耐熱衝撃性も良好で加熱収縮も小さい
ものであり、その実用上の価値は多大である。The cast refractory composition of the present invention has good self-flowability, does not form a separation layer even when jointed, has good thermal shock resistance, and has small heat shrinkage. , Its practical value is enormous.
Claims (1)
粉末として、アルミナセメント０．５〜５重量％、アル
ミナ微粉２〜５重量％、ヒュームドシリカ微粉３〜８重
量％を含み、リン酸ソーダ０．０２〜０．５重量％と、
ナフタレンスルホン酸ホルムアルデヒド縮合物ナトリウ
ム０．０２〜０．５重量％とからなる組成物であって、
該組成物中に含まれる粒径１０μｍ以下の微粉の含有量
が８〜２３重量％であり、該組成物１００重量部に対し
て８重量部の水を加えて混練した直後の杯土を、水平な
板面上に置いた上部内径５０ｍｍ、底部内径１００ｍ
ｍ、高さ１５０ｍｍのコーン型に流し込んで充たし、該
コーン型を上方に抜き取って振動を加えないで６０秒間
静置したときの杯土の拡がり直径が１６５ｍｍ以上であ
ることを特徴とする流し込み耐火物用組成物。1. A refractory aggregate comprising 77 to 95% by weight of a refractory powder, alumina cement 0.5 to 5% by weight, alumina fine powder 2 to 5% by weight, and fumed silica fine powder 3 to 8% by weight. Containing, 0.02 to 0.5% by weight of sodium phosphate,
A composition comprising 0.02-0.5% by weight of sodium naphthalenesulfonic acid formaldehyde condensate,
The content of the fine powder having a particle size of 10 μm or less contained in the composition is 8 to 23% by weight, and the clay immediately after kneading by adding 8 parts by weight of water to 100 parts by weight of the composition, Top inside diameter 50mm, bottom inside diameter 100m placed on a horizontal plate surface
m, a cone type having a height of 150 mm, filled with the cone type, and the cone type is pulled out upward and left standing for 60 seconds without applying vibration, and the spreading diameter of the cover soil is 165 mm or more, which is a refractory pouring fire. Object composition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19935996A JPH1045479A (en) | 1996-07-29 | 1996-07-29 | Slip casting refractory material composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19935996A JPH1045479A (en) | 1996-07-29 | 1996-07-29 | Slip casting refractory material composition |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1045479A true JPH1045479A (en) | 1998-02-17 |
Family
ID=16406457
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19935996A Pending JPH1045479A (en) | 1996-07-29 | 1996-07-29 | Slip casting refractory material composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1045479A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007145706A (en) * | 2005-11-07 | 2007-06-14 | Nippon Steel Corp | Method for kneading monolithic refractory |
-
1996
- 1996-07-29 JP JP19935996A patent/JPH1045479A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007145706A (en) * | 2005-11-07 | 2007-06-14 | Nippon Steel Corp | Method for kneading monolithic refractory |
| JP4746518B2 (en) * | 2005-11-07 | 2011-08-10 | 新日本製鐵株式会社 | Method of kneading irregular refractories |
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