JP4034858B2 - Indeterminate refractories for casting construction - Google Patents
Indeterminate refractories for casting construction Download PDFInfo
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- JP4034858B2 JP4034858B2 JP29767597A JP29767597A JP4034858B2 JP 4034858 B2 JP4034858 B2 JP 4034858B2 JP 29767597 A JP29767597 A JP 29767597A JP 29767597 A JP29767597 A JP 29767597A JP 4034858 B2 JP4034858 B2 JP 4034858B2
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- 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
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
- C04B35/632—Organic additives
- C04B35/634—Polymers
- C04B35/63448—Polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B35/63488—Polyethers, e.g. alkylphenol polyglycolether, polyethylene glycol [PEG], polyethylene oxide [PEO]
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- 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
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- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3206—Magnesium oxides or oxide-forming salts thereof
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
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Description
【０００１】
【発明の属する技術分野】
本発明は、製鉄産業における溶融金属容器の内張り等に使用される流し込み施工用不定形耐火物に関する。
【０００２】
【従来の技術】
流し込み施工用不定形耐火物（以下、流し込み材と称する）は、定形耐火物に比べて施工が迅速かつ容易、製造コストが低いなどの利点がある。しかし、多量の施工水を使用することから、緻密性に劣ることは否めない。そこで流し込み材は
、耐火性超微粉と分散剤との添加で施工時の流動性を向上させ、施工水を低減して施工体の緻密化を図ることが知られている。
【０００３】
ここで使用される耐火性超微粉は、特開平７−２７７８４１号公報等に見られるように、シリカ、アルミナ、カオリン、粘土、ベントナイト、チタニア、アルミノシリケート、酸化クロム、炭素などである。一方、分散剤は無機系の珪酸塩、炭酸塩、リン酸塩、有機系のポリカルボン酸塩、無水カルボン酸の重合物、芳香族多環縮合物スルホン酸塩系、メラニン樹脂スルホン酸塩系、リグニンスルホン酸塩系、ポリアクリル酸塩等である。
【０００４】
【発明が解決しようとする課題】
しかし、近年の炉操業の過酷化と炉材コストの大幅な削減要求に対し、従来の流し込み材では、その耐用性において十分なものではない。
本発明は、施工性を損なうことなく、従来材質に比べて耐用性に優れた流し込み材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】
本発明は、製鉄産業における溶融金属容器の内張りに使用される流し込み施工用不定形耐火物であって、アルミナ超微粉および／またはＡｌ２Ｏ３・ＭｇＯ系スピネル超微粉を１〜２０重量％含み全体としてアルミナ−マグネシア質、アルミナ−スピネル質あるいはアルミナ−スピネル−マグネシア質とした耐火性骨材１００重量部に、アルミナセメントとカルボキシル基含有ポリエーテル系分散剤を添加してなり、施工時に流し込み施工用不定形耐火物組成全体に対して外掛け３〜８重量％の施工水を添加し、混練後、施工される流し込み施工用不定形耐火物である。
【０００６】
有機系分散剤は、耐火性微粉の表面に吸着して粒子同士の反発させる吸着層を形成するが、本発明で使用するカルボキシル基含有ポリエーテル系分散剤は、長大なエチレンオキサイド鎖を有していることで、アルミナ超微粉および／またはＡｌ2Ｏ3・ＭｇＯ系スピネル超微粉の粒子表面に形成される分散剤の吸着層の厚さが特に大きく、分散効果に優れる。
【０００７】
カルボキシル基含有ポリエーテル系分散剤を使用したことによる本発明おける顕著な流動性向上は、後述の実施例で示した試験結果のとおり、アルミナ超微粉および／またはＡｌ2Ｏ3・ＭｇＯ系スピネル超微粉との組み合わせによって初めて得ることができる。
【０００８】
本発明においてこの効果が得られる理由は明確ではないが、アルミナ超微粉またはＡｌ2Ｏ3・ＭｇＯ系スピネル超微粉は中性質であるのに対し、酸性質または塩基性質のシリカ、マグネシア、チタニアなどの超微粉では粒子表面に形成される分散剤の吸着層が沈着し難いためと考えられる。なお、炭素、クロムなどは中性質であるが、炭素は濡れ性が悪いために分散剤の吸着性に劣り、クロムは公害源となる問題があり、いずれも好ましくない。
【０００９】
また、一般の有機系分散剤はアルミナセメント粒子表面への吸着によってアルミナセメントからのイオンの溶出を妨げ、流し込み材の硬化遅延および強度低下の原因となる。これに対し、カルボキシル基含有ポリエーテル系分散剤は、飽和吸着量が小さいことによりアルミナセメント粒子表面への吸着量が少ないため、ＡｌイオンとＣａイオンの溶出を妨げないことで施工体の硬化促進および強度にも優れた効果をもつ。
【００１０】
その結果、本発明による流し込み材は、優れた施工性をもって高強度かつ緻密な施工体を得ることができる。
【００１１】
【発明の実施の形態】
本発明で使用するアルミナ超微粉またはＡｌ2Ｏ3・ＭｇＯ系スピネル超微粉は、カルボキシル基含有ポリエーテル系分散剤との組み合わせにより、流し込み材の施工時の流動性を向上させる効果をもつ。アルミナ超微粉の具体的な材質は、焼結アルミナまたは電融アルミナを微粉砕したものである。
【００１２】
一方、Ａｌ2Ｏ3・ＭｇＯ系スピネル超微粉（以下、単にスピネル超微粉と称する）の具体例は、焼結スピネルまたは電融スピネルを微粉砕したものである。Ａｌ2Ｏ3とＭｇＯの化学成分値は必ずしもスピネル理論値のものでなくてもよく、例えばＡｌ2Ｏ3リッチであってもよい。
耐火性骨材中に占めるアルミナ超微粉および／またはスピネル超微粉の割合は、１〜２０重量％とする。１重量％未満では耐食性および流動性に劣り、２０重量％を超えると過焼結となって耐スポーリング性に劣り、しいては耐用性の低下を招く。
【００１３】
また、アルミナ超微粉またはスピネル超微粉は、焼結品の中でも仮焼品の使用が好ましい。焼結アルミナが通常１７００℃以上の超高温で焼成されるのに対し、仮焼品は１０００〜１５００℃程度の比較的低温で焼成されたものである。高温焼成されていないことで表面性状が活性であり、分散剤による吸着層が剥離し難いためか、本発明における流動性の向上がさらに顕著となる。
【００１４】
アルミナ超微粉またはスピネル超微粉の粒径の具体例は、１０μｍ以下とする。粒径が大きいと本発明の流動性向上について顕著な効果が得られない。また本発明は、耐火性骨材中にアルミナ超微粉および／またはスピネル超微粉を１〜２０重量％含有するものであり、超微粉以外のアルミナまたはスピネルの割合を制約するものではない。
【００１５】
これらに耐火性超微粉の粒径確認は、例えばレーザー回折法によって行なうことができる。後述の本発明実施例における耐火性超微粉の粒径確認についても、このレーザー回折法を使用した。
【００１６】
耐火物骨材において、前記のアルミナ超微粉またはスピネル超微粉以外は、その割合、粒径ともに限定されるものではない。耐火骨材全体としてアルミナ−マグネシア質、アルミナ−スピネル質あるいはアルミナ−スピネル−マグネシア質とし、流し込み材全体の粒度構成は密充填の施工体が得られるように、アルミナ超微粉および／またはスピネル超微粉との割合に合わせて適宜調整する。
【００１７】
アルミナ超微粉またはスピネル超微粉以外に使用する耐火骨材の種類は、例えば、アルミナ（超微粉以外での使用分）、スピネル（超微粉以外での使用分）、マグネシア、ジルコン、ジルコニア、シリカ、シリカ−アルミナ、炭素、炭化物、窒化物等である。また、本発明は、アルミナ超微粉および／またはスピネル超微粉を使用していれば、他の耐火性超微粉を組合せ使用してもよい。
【００１８】
このうち、例えばアルミナについて具体例を示すと、焼結アルミナ、電融アルミナ、高アルミナ等である。マグネシア、スピネル等についても焼結品、電融品のいずれを使用してもよい。また、施工体に断熱性あるいは軽量化を付与するために前記耐火性骨材は多孔質品を使用してもよい。
【００１９】
アルミナセメントは結合剤としての役割をもつ。添加割合は従来の流し込み材と特に変わりない。好ましくは、耐火骨材１００重量部に対して１〜１５重量部とする。１未満では十分な施工体強度が得られず、１５重量部を超えると耐食性低下の傾向がある。アルミナセメントは、例えば電気化学（株）社製の「ＨＡセメント」、仏国；ラファージュ・アルミネート社の「セカール７１」、米国；アルコア社「ＣＡ−２５」（いずれも商品名）などの市販品から入手することができる。
【００２０】
カルボキシル基含有ポリエーテル系分散剤は、粉状、液状のいずれで使用してもよい。液状は例えば水等に分散または溶解したものである。添加量は従来材質における分散剤の場合と特に変わりなく、耐火性骨材１００重量部に対し、固形分換算で０．０３〜０．５重量部が好ましい。添加量が少ないと流動性付与の効果が不十分となり、多過ぎると硬化遅延によって施工性に劣る。さらに好ましい割合は、０．０５〜０．２５重量部である。また、他の分散剤と組み合わせ使用してもよいが、分散剤の総量は経済性の意味からも１重量部を超えることは好ましくない。
【００２１】
このカルボキシル基含有ポリエーテル系分散剤は、例えば花王（株）社製の「マイティ３０００Ｓ」や「マイティ２１Ｖ」（いずれも商品名）などの市販品から入手することができる。
【００２２】
本発明では他にも、必要によっては流し込み材の添加物として知られている耐火超粗大粒子、硬化調整剤、消化防止剤、塩基性乳酸アルミニウム、有機短繊維、金属短繊維、ガラス粉、金属粉、炭素粉、ピッチ粉、セラミック短繊維、発泡剤、粘土、揮発シリカなどを添加してもよい。
【００２３】
ここで耐火超粗大粒子は、一般には粒径８〜３０ｍｍの耐火性原料をいう。耐火超粗大粒子は、施工体組織内に発生した亀裂が進展するのを防止する役割を持ち、前記した耐火性骨材とは区別される。その材質はマグネシア、アルミナ、スピネル、ムライトなどである。
【００２４】
耐火性骨材にマグネシアを使用した場合、施工水との反応で消化が懸念されるため、消化防止剤として揮発シリカを添加することが好ましい。揮発シリカは、例えばシリコン、シリコン合金製造の際の副産物として得られるシリカ超微粒子である。「シリカフラワー」あるいは「マイクロシリカ」の商品名で市販されている。
【００２５】
流し込み材の施工は常法どおり、流し込み材組成全体に対して外掛け３〜８重量％程度の施工水を添加し、混練後、流し込み施工される。施工の際には充填促進のために耐火物中に棒状バイブレータを挿入するか、施工枠にバイブレータを取付けて、振動を付与するのが好ましい。また、本発明の材質は流動性に富むため、必ずしも振動を付与する必要はない。溶融金属容器を内張りする際には、中子を用して直接流し込み施工する他、予め流し込み施工して得たブロックを内張りしてもよい。
【００２６】
【実施例】
表１は、各例で使用した耐火性超微粉の粒径と化学分析値である。
表２および表３は、本発明実施例とその比較例ならびにその試験結果を示す。ここでのカルボキシル基含有ポリエーテル系分散剤は、花王（株）社製の「マイティ２１Ｖ」（商品名）を使用した。
また、分散剤はいずれも粉末状で添加したものである。したがって、各例での表示は、固形分の割合である。
【００２７】
試験方法は、以下のとおり。
流動性；各例の材質に合わせた最適量の施工水を添加し、混練後、未振動状態でのフリーフロー値を測定した。下端の直径１００×上端の直径７０×高さ６０ｍｍのフローコーンから排出し、測定した。したがって、全く広がりがない状態が１００ｍｍである。
【００２８】
緻密性；流し込み施工後、養生、乾燥（１１０×２４時間）したものについて、見掛気孔率を測定した。
耐食性；流し込み施工後、養生、乾燥（１１０×２４時間）して得た施工体について、転炉スラグおよび鋼片（重量比＝１：１）を侵食剤とした回転侵食試験法にて測定した。１６５０℃×３０分を８サイクルを行った後、溶損寸法を測定した。
【００２９】
耐スラグ浸透性；前記回転侵食試験法に供した溶損後の試験片を切断し、スラグ浸透寸法を測定した。
強度；流し込み施工後、養生、乾燥（１１０×２４時間）して得た施工体について、曲げ強さを測定した。
実機試験；１５０ｔ溶鋼取鍋の内張りに使用し、その耐用チャージ数を測定した。
【００３０】
【表１】
【表２】
【表３】
実施例はいずれも流動性に富み、施工水の低減によって施工体の緻密性が向上する。その結果、緻密質で耐食性および耐スラグ浸透性に優れた施工体を得ることができた。中でも、仮焼品のアルミナ超微粉またはスピネル超微粉を使用したものがより優れた結果が得られた。
【００３４】
これに対し、従来一般的な分散剤を使用した比較例１〜４、比較例８〜１１および比較例１３は、いずれも流動性に劣ることで緻密な施工体が得られない。その結果、耐食性、耐スラグ浸透性および強度共に劣る。
【００３５】
なお。比較例１は施工水の増量で流動性を補っており、フリーフロー値は実施例５に同じ数値であるが、施工水量が多いことで緻密性に劣る。したがって、比較例１も実質的には流動性に劣る。
【００３６】
超微粉にマグネシア超微粉を使用した比較例５および比較例１４、超微粉にシリカ超微粉を使用した比較例７および比較例１５は、流動性の向上において本発明実施例のごとき効果が得られず、緻密性、耐食性、耐スラグ浸透性および強度共に劣る
【００３７】
比較例６と比較例１２はアルミナ超微粉またはスピネル超微粉を使用しているが、その量が２０重量％を超えるため、過焼結による耐スポーリング性の低下で耐用性に劣る。
【００３８】
【発明の効果】
以上のように本発明の流し込み材は、優れた施工性をもって高強度かつ緻密な施工体を得ることができる。近年の炉操業の過酷化と炉材コストの大幅な削減要求の状況下において、本発明による流し込み材の価値は大きい。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an indeterminate refractory material for casting construction used for lining of molten metal containers in the steel industry.
[0002]
[Prior art]
An irregular refractory for casting construction (hereinafter referred to as a casting material) has advantages such as quicker and easier construction and lower manufacturing cost than a regular refractory. However, since a large amount of construction water is used, it cannot be denied that the density is inferior. Therefore, it is known that the casting material improves the fluidity at the time of construction by adding a refractory ultrafine powder and a dispersing agent, reduces the construction water, and densifies the construction body.
[0003]
The fire-resistant ultrafine powder used here is silica, alumina, kaolin, clay, bentonite, titania, aluminosilicate, chromium oxide, carbon, etc. as can be seen in JP-A-7-277841. On the other hand, the dispersant is inorganic silicate, carbonate, phosphate, organic polycarboxylate, polymer of carboxylic anhydride, aromatic polycyclic condensate sulfonate, melanin resin sulfonate Lignin sulfonates, polyacrylates and the like.
[0004]
[Problems to be solved by the invention]
However, the conventional casting material is not sufficient in its durability in response to the recent severe operation of the furnace and the demand for significant reduction of the furnace material cost.
An object of this invention is to provide the casting material excellent in durability compared with the conventional material, without impairing workability.
[0005]
[Means for Solving the Problems]
The present invention is an irregular refractory material for casting construction used for lining of molten metal containers in the steel industry , and contains 1 to 20% by weight of alumina ultrafine powder and / or Al 2 O 3 .MgO-based spinel ultrafine powder. As a whole , alumina cement and carboxyl group-containing polyether dispersant are added to 100 parts by weight of refractory aggregate made of alumina-magnesia, alumina-spinel, or alumina-spinel-magnesia, and poured during construction. It is an unshaped refractory for casting construction that is constructed after adding 3 to 8% by weight of construction water to the entire construction of unstructured refractory composition for construction and kneading .
[0006]
The organic dispersant is adsorbed on the surface of the refractory fine powder to form an adsorption layer that repels particles. The carboxyl group-containing polyether dispersant used in the present invention has a long ethylene oxide chain. Therefore, the thickness of the adsorption layer of the dispersant formed on the surface of the particles of the alumina ultrafine powder and / or Al 2 O 3 .MgO-based spinel ultrafine powder is particularly large, and the dispersion effect is excellent.
[0007]
The remarkable improvement in fluidity in the present invention due to the use of the carboxyl group-containing polyether dispersant is that the alumina ultrafine powder and / or the Al 2 O 3 .MgO spinel It can be obtained for the first time in combination with fine powder.
[0008]
The reason why this effect is obtained in the present invention is not clear, but alumina ultrafine powder or Al 2 O 3 .MgO-based spinel ultrafine powder is moderate, whereas acid or basic silica, magnesia, titania, etc. This is thought to be because the adsorption layer of the dispersant formed on the particle surface is difficult to deposit with the ultrafine powder. Carbon, chromium, and the like are medium in nature, but carbon has poor wettability, so that the adsorptivity of the dispersant is inferior, and chromium has a problem of becoming a pollution source.
[0009]
Further, general organic dispersants prevent the elution of ions from the alumina cement due to adsorption to the surface of the alumina cement particles, causing a delay in hardening of the casting material and a decrease in strength. On the other hand, the carboxyl group-containing polyether dispersant has a small amount of adsorption on the surface of alumina cement particles due to its small amount of saturated adsorption, so it does not hinder the elution of Al ions and Ca ions to accelerate the hardening of the construction body. It also has an excellent effect on strength.
[0010]
As a result, the casting material according to the present invention can obtain a high-strength and dense construction body with excellent workability.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The alumina ultrafine powder or Al 2 O 3 .MgO-based spinel ultrafine powder used in the present invention has an effect of improving the fluidity at the time of construction of the casting material, in combination with the carboxyl group-containing polyether dispersant. A specific material of the ultrafine alumina powder is a finely pulverized sintered alumina or electrofused alumina.
[0012]
On the other hand, a specific example of the Al 2 O 3 .MgO-based spinel ultrafine powder (hereinafter simply referred to as spinel ultrafine powder) is obtained by finely pulverizing a sintered spinel or an electrofused spinel. The chemical component values of Al 2 O 3 and MgO do not necessarily have to be spinel theoretical values, and may be, for example, Al 2 O 3 rich.
The ratio of the ultrafine alumina powder and / or the fine spinel powder in the refractory aggregate is 1 to 20% by weight. If it is less than 1% by weight, it is inferior in corrosion resistance and fluidity, and if it exceeds 20% by weight, it becomes oversintered and inferior in spalling resistance, leading to a decrease in durability.
[0013]
In addition, the alumina ultrafine powder or the spinel ultrafine powder is preferably a calcined product among the sintered products. Sintered alumina is usually fired at an ultrahigh temperature of 1700 ° C. or higher, whereas a calcined product is fired at a relatively low temperature of about 1000 to 1500 ° C. The improvement in the fluidity in the present invention becomes more remarkable because the surface property is active because it is not fired at a high temperature and the adsorbing layer due to the dispersant is difficult to peel off.
[0014]
A specific example of the particle diameter of the alumina ultrafine powder or the spinel ultrafine powder is 10 μm or less. When the particle size is large, a remarkable effect cannot be obtained for improving the fluidity of the present invention. Moreover, this invention contains 1-20 weight% of alumina ultrafine powder and / or spinel ultrafine powder in a refractory aggregate, and does not restrict | limit the ratio of alumina or spinel other than ultrafine powder.
[0015]
The particle diameter of the refractory ultrafine powder can be confirmed by, for example, a laser diffraction method. This laser diffraction method was also used for confirming the particle size of the refractory ultrafine powder in Examples described later.
[0016]
In the refractory aggregate, other than the above-mentioned alumina ultrafine powder or spinel ultrafine powder, the ratio and particle size are not limited. Magnesia, alumina - - alumina as a whole anti-fire aggregate spinel or alumina - Spinel - and magnesia, the particle size configuration of the entire cast material as construction of packing is obtained, alumina micronized and / or spinel greater It adjusts suitably according to the ratio with fine powder.
[0017]
The types of refractory aggregates used in addition to alumina ultrafine powder or spinel ultrafine powder are, for example, alumina (for use other than ultrafine powder), spinel (for use other than ultrafine powder), magnesia, zircon, zirconia, silica, Silica-alumina, carbon, carbide, nitride and the like. Further, in the present invention, as long as alumina ultrafine powder and / or spinel ultrafine powder is used, other fireproof ultrafine powder may be used in combination.
[0018]
Among these, for example, specific examples of alumina include sintered alumina, electrofused alumina, and high alumina. As for magnesia, spinel and the like, either a sintered product or an electromelted product may be used. Moreover, in order to give heat insulation or weight reduction to a construction body, the said fireproof aggregate may use a porous article.
[0019]
Alumina cement serves as a binder. The addition ratio is not particularly different from the conventional casting material. Preferably, it is 1 to 15 parts by weight with respect to 100 parts by weight of the refractory aggregate. If it is less than 1, sufficient construction body strength cannot be obtained, and if it exceeds 15 parts by weight, the corrosion resistance tends to decrease. Alumina cements are commercially available, for example, “HA Cement” manufactured by Electrochemical Co., Ltd., France; “SECAR 71” manufactured by Lafarge Aluminate, USA; “CA-25” (all trade names) manufactured by Alcoa. It can be obtained from the product.
[0020]
The carboxyl group-containing polyether dispersant may be used in either powder or liquid form. The liquid is, for example, dispersed or dissolved in water or the like. The addition amount is not particularly different from the case of the dispersant in the conventional material, and is preferably 0.03 to 0.5 parts by weight in terms of solid content with respect to 100 parts by weight of the refractory aggregate. When the addition amount is small, the effect of imparting fluidity becomes insufficient, and when it is too large, the workability is inferior due to the delay in curing. A more desirable ratio is from 0.05 to 0.25 part by weight. Further, although it may be used in combination with other dispersants, it is not preferable that the total amount of the dispersant exceeds 1 part by weight from the viewpoint of economy.
[0021]
This carboxyl group-containing polyether dispersant can be obtained from commercial products such as “Mighty 3000S” and “Mighty 21V” (both trade names) manufactured by Kao Corporation.
[0022]
In the present invention, other than that, known as an additive of a pouring material, refractory ultra coarse particles, curing modifier, digestion inhibitor, basic aluminum lactate, organic short fiber, short metal fiber, glass powder, metal Powder, carbon powder, pitch powder, ceramic short fiber, foaming agent, clay, volatile silica and the like may be added.
[0023]
Here, the refractory ultra coarse particles generally refer to a refractory raw material having a particle diameter of 8 to 30 mm. The refractory ultra coarse particles have a role of preventing the cracks generated in the construction body structure from progressing, and are distinguished from the aforementioned refractory aggregate. The material is magnesia, alumina, spinel, mullite and the like.
[0024]
When magnesia is used for the refractory aggregate, there is concern about digestion due to reaction with the construction water, so it is preferable to add volatile silica as a digestion inhibitor. Volatile silica is, for example, ultrafine silica particles obtained as a by-product in the production of silicon and silicon alloys. It is marketed under the trade name “Silica Flower” or “Micro Silica”.
[0025]
The casting material is applied in the usual manner by adding about 3 to 8% by weight of construction water to the entire casting material composition, kneading and then casting. In the construction, it is preferable to insert a rod-like vibrator into the refractory to facilitate filling or attach a vibrator to the construction frame to impart vibration. Moreover, since the material of the present invention is rich in fluidity, it is not always necessary to apply vibration. When the molten metal container is lined, a block obtained by casting in advance may be lined in addition to direct casting using a core.
[0026]
【Example】
Table 1 shows the particle size and chemical analysis value of the refractory ultrafine powder used in each example.
Tables 2 and 3 show examples of the present invention, comparative examples thereof, and test results thereof. As the carboxyl group-containing polyether dispersant here, “Mighty 21V” (trade name) manufactured by Kao Corporation was used.
Moreover, all the dispersing agents are added in powder form. Therefore, the display in each example is a solid content ratio.
[0027]
The test method is as follows.
Flowability: An optimal amount of construction water according to the material of each example was added, and after kneading, the free flow value in an unvibrated state was measured. It was discharged from a flow cone having a lower end diameter of 100 × upper end diameter of 70 × height of 60 mm and measured. Therefore, the state where there is no spread is 100 mm.
[0028]
Denseness: The apparent porosity was measured for the cured and dried (110 × 24 hours) after casting.
Corrosion resistance: After casting, curing and drying (110 × 24 hours) were measured by the rotary erosion test method using converter slag and steel slabs (weight ratio = 1: 1) as erodants. . After performing 8 cycles of 1650 ° C. × 30 minutes, the erosion dimension was measured.
[0029]
Resistance to slag penetration; The test piece after melting for use in the rotational erosion test method was cut, and the slag penetration size was measured.
Strength: After casting, bending strength was measured for a construction body obtained by curing and drying (110 × 24 hours).
Actual machine test: Used for lining of 150t molten steel ladle, and measured the number of charges to be used.
[0030]
[Table 1]
[Table 2]
[Table 3]
Each of the examples is rich in fluidity, and the density of the construction body is improved by reducing the construction water. As a result, it was possible to obtain a dense construction body excellent in corrosion resistance and slag penetration resistance. Among them, a better result was obtained when the calcined product using alumina ultrafine powder or spinel ultrafine powder was used.
[0034]
On the other hand, in Comparative Examples 1 to 4, Comparative Examples 8 to 11 and Comparative Example 13 using a conventional general dispersing agent, none of the fluidity is inferior, so that a dense construction body cannot be obtained. As a result, both corrosion resistance, slag penetration resistance and strength are poor.
[0035]
Note that. Comparative Example 1 compensates for fluidity by increasing the amount of construction water, and the free flow value is the same value as in Example 5, but the denseness is inferior due to the large amount of construction water. Therefore, Comparative Example 1 is also substantially inferior in fluidity.
[0036]
Comparative Example 5 and Comparative Example 14 using ultra-fine magnesia powder as the ultrafine powder, Comparative Example 7 and Comparative Example 15 using ultra-fine silica powder as the ultrafine powder have the same effects as the embodiment of the present invention in improving fluidity. Inferior in denseness, corrosion resistance, slag penetration and strength
Comparative Example 6 and Comparative Example 12 use alumina ultrafine powder or spinel ultrafine powder, but since the amount exceeds 20 wt%, the durability is inferior due to a decrease in spalling resistance due to oversintering.
[0038]
【The invention's effect】
As described above, the casting material of the present invention can obtain a high-strength and dense construction body with excellent workability. The value of the casting material according to the present invention is great under the recent severe conditions of furnace operation and the demand for significant reduction of furnace material cost.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29767597A JP4034858B2 (en) | 1997-10-14 | 1997-10-14 | Indeterminate refractories for casting construction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29767597A JP4034858B2 (en) | 1997-10-14 | 1997-10-14 | Indeterminate refractories for casting construction |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11116345A JPH11116345A (en) | 1999-04-27 |
| JP4034858B2 true JP4034858B2 (en) | 2008-01-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29767597A Expired - Lifetime JP4034858B2 (en) | 1997-10-14 | 1997-10-14 | Indeterminate refractories for casting construction |
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| JP (1) | JP4034858B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4571354B2 (en) * | 2001-09-28 | 2010-10-27 | 黒崎播磨株式会社 | Indeterminate refractories for casting construction |
| JP6384511B2 (en) * | 2016-04-27 | 2018-09-05 | Ｊｆｅスチール株式会社 | Castable refractories |
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| Publication number | Publication date |
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| JPH11116345A (en) | 1999-04-27 |
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