JP2000143355A - Prepared unshaped refractory - Google Patents
Prepared unshaped refractoryInfo
- Publication number
- JP2000143355A JP2000143355A JP10311973A JP31197398A JP2000143355A JP 2000143355 A JP2000143355 A JP 2000143355A JP 10311973 A JP10311973 A JP 10311973A JP 31197398 A JP31197398 A JP 31197398A JP 2000143355 A JP2000143355 A JP 2000143355A
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- Prior art keywords
- weight
- refractory
- particle size
- alumina
- silica
- Prior art date
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-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B35/62204—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products using waste materials or refuse
-
- 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
- C04B35/622—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
- C04B35/6303—Inorganic additives
-
- 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
-
- 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
- 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
-
- 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
- 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
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3418—Silicon oxide, silicic acids, or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
-
- 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
- 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
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3427—Silicates other than clay, e.g. water glass
- C04B2235/3463—Alumino-silicates other than clay, e.g. mullite
-
- 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
- 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
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/54—Particle size related information
- C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
- C04B2235/5427—Particle size related information expressed by the size of the particles or aggregates thereof millimeter or submillimeter sized, i.e. larger than 0,1 mm
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/54—Particle size related information
- C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
- C04B2235/5436—Particle size related information expressed by the size of the particles or aggregates thereof micrometer sized, i.e. from 1 to 100 micron
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Ceramic Products (AREA)
Abstract
Description
【０００１】[0001]
【発明が属する技術分野】本発明は、例えばタンディッ
シュの内張り、タンディッシュカバー、高炉出銑樋カバ
ー、ランスパイプ、溶銑搬送容器の内張り、パーマ部、
焼却炉、焼成炉等に用いられる不定形耐火物に関する。BACKGROUND OF THE INVENTION The present invention relates to a tundish lining, a tundish cover, a blast furnace tapping gutter cover, a lance pipe, a hot metal transfer vessel lining, a perm portion, and the like.
The present invention relates to irregular refractories used in incinerators, firing furnaces, and the like.
【０００２】[0002]
【従来技術】タンディッシュを例にとっていえば、タン
ディッシュの内張り用不定形耐火物として従来は一般
に、未使用の天然及び合成原料を骨材に使用したアルミ
ナ−シリカ質のものが用いられているが、コストの低減
及び廃棄物の減少を目的として溶融金属容器の内張耐火
物として一度使用した耐火物を破砕して、これをそのま
ゝ或いは表面改質を行ってから再度不定形耐火物の骨材
として利用する試みが種々なされている。2. Description of the Related Art Taking a tundish as an example, an amorphous-silica-based refractory having an unused natural or synthetic raw material as an aggregate is generally used as an amorphous refractory for lining a tundish. However, for the purpose of cost reduction and waste reduction, the refractory once used as the lining refractory of the molten metal container is crushed, and the crushed refractory is used as it is or the surface is reformed, and then the amorphous refractory is re-formed. Attempts have been made to use it as an aggregate.
【０００３】このうち表面改質を行う例として、例えば
特開平６−２１９８５３号にはマグーカーボンレンガ屑
をシリカゾル溶液に浸漬し、レンガ層内部にシリカ分を
含浸させる方法、特開平８−２１７５５３号には、使用
済み耐火物を破砕して高分子化合物やピッチで被覆する
方法、特開平９−２７８５４８号には、使用済み耐火物
を破砕して加熱酸化処理し、ついで表面処理剤を含浸さ
せる方法などが提案されている。As an example of surface modification, for example, JP-A-6-219853 discloses a method in which mag-carbon brick waste is immersed in a silica sol solution to impregnate silica inside the brick layer. JP-A-9-278548 discloses a method of crushing a used refractory and coating it with a polymer compound or a pitch. Methods have been proposed.
【０００４】[0004]
【発明が解決しようとする課題】使用済み耐火物を破砕
してそのまゝ再利用する場合、次のような難点がある。
使用済み耐火物は、その層を図１に示すように三層に分
けると、各層は表１に示すように受熱及びスラグ成分の
浸透により組織が大きく変化し、使用面側の表層部の組
織は耐火性も低下している。When a used refractory is crushed and reused as it is, there are the following difficulties.
The used refractory is divided into three layers as shown in Fig. 1, and the structure of each layer changes greatly due to heat reception and penetration of slag components as shown in Table 1, and the structure of the surface layer on the used surface side Has also reduced fire resistance.
【０００５】[0005]
【表１】 このような使用済み耐火物を破砕して原料として使用す
ると、 ・耐火物の組織の均一性が保ちにくい。 ・耐火度は３層目のものでも未使用のものと同程度で、
他の層はそれより低いため耐火度が低下する。[Table 1] When such a used refractory is crushed and used as a raw material, it is difficult to maintain uniformity of the refractory structure.・ The fire resistance of the third layer is about the same as that of unused ones.
The other layers are lower and have a lower fire rating.
【０００６】・吸水率は１層目のもので未使用のものと
同様であり、他の層はそれより大きいため吸水率が高く
なり、そのため流動性が低下し、作業性及び耐火物の性
能を低下させる。などの難点があり、このことから従来
は耐用（寿命）の影響を少なくするため、使用済み耐火
物の使用量を少なく制限していた。[0006] The water absorption of the first layer is the same as that of the unused layer, and the other layers are larger than that of the unused layer, so that the water absorption is high, so that the fluidity is reduced and the workability and the performance of the refractory are reduced. Lower. Therefore, in order to reduce the influence of the service life (life), the use amount of the used refractory has been limited in the past.
【０００７】上記の問題を解消するため、１層目の使用
済み耐火物を除去して残りの耐火物を再利用するのも１
層目の耐火物を選別除去するのに手間がかゝりコスト高
となるほか、再利用できる耐火物は全体の２／３程度と
なり、廃棄物の発生量と原料コストを低減させる効果が
不十分となる。一方、使用済み耐火物を破砕して表面改
質を行う方法は、コストがかゝり過ぎ、使用済み耐火物
を再利用する障害となっている。In order to solve the above problem, it is also necessary to remove the first-layer used refractory and reuse the remaining refractory.
It takes much time and labor to separate and remove the refractory material in the layer, and the refractory material that can be reused is only about 2/3 of the total, making it difficult to reduce the amount of waste generated and the cost of raw materials. Will be enough. On the other hand, the method of crushing used refractories and performing surface modification is too expensive, and is an obstacle to reusing used refractories.
【０００８】本発明は、表面改質を行うことなく、より
多くの使用済み耐火物を再利用できる不定形耐火物を提
供することを目的とする。[0008] It is an object of the present invention to provide an amorphous refractory capable of reusing more used refractories without performing surface modification.
【０００９】[0009]
【課題の解決手段】請求項１記載の発明は、アルミナー
シリカ質の不定形耐火物であって、アルミナーシリカ質
の使用済み耐火物を破砕し、１０〜４０mmの粒度範囲の
もの２０重量％以下、３〜１０mmの粒度範囲のもの４０
重量％以下、合計６０重量％以下配合したことを特徴と
し、使用済み耐火物としては、金属ファイバーを含有す
るものを使用することもできる。The invention according to claim 1 is an alumina-siliceous amorphous refractory which crushes a used alumina-silica refractory and has a particle size range of 10 to 40 mm. % Or less and a particle size range of 3 to 10 mm 40
It is characterized in that it is blended in an amount of not more than 60% by weight in total, and the used refractory may be one containing metal fibers.
【００１０】本発明によれば、使用済み耐火物を破砕整
粒するだけで表面改質を行うことなく最大６０重量％ま
で使用することができる。１０〜４０mmの粒度範囲の使
用済み耐火物を使用する理由は、 (1)使用済み耐火物を使用現場で解体する場合、大凡５
００mm角程度に破壊される。これをジョークラッシャー
を用いて破砕する場合、４０mm程度の粒度で破砕する
と、破砕効率及び歩溜りが最もよいこと。According to the present invention, the used refractory can be used up to 60% by weight only by crushing and sizing the used refractory without surface modification. The reasons for using used refractories with a particle size range of 10 to 40 mm are as follows: (1) When dismantling used refractories at the site of use, roughly 5
Destroyed to about 00mm square. When this is crushed using a jaw crusher, crushing with a particle size of about 40 mm has the best crushing efficiency and yield.
【００１１】(2)１０〜４０mmの粒度範囲のものゝ中に
は比較的堅い部分、すなわち図１におけるスラグ付着層
と、使用済み耐火物の１層目とが多く含まれる。よって
１０〜４０mmの粒度範囲のものを更に１０mm以下の微粉
に破砕した場合、それ自体、受熱による劣化が促進され
るばかりでなく、未使用の耐火材と反応し易くなり、耐
火物全体の耐火度の低下、焼結の促進及び耐蝕性の低下
が起きるため好ましくなく、吸水率と気孔率の影響の少
ない１０〜４０mmの粒度範囲のものを使用するのが好ま
しいこと。(2) Those having a particle size range of 10 to 40 mm include a relatively hard portion, that is, a slag adhesion layer in FIG. 1 and a first layer of a used refractory in a large amount. Therefore, when the powder having a particle size range of 10 to 40 mm is further crushed into fine powder having a size of 10 mm or less, not only the deterioration itself due to heat reception is promoted, but also it becomes easy to react with unused refractory material, and the refractory of the entire refractory is rejected. It is not preferable because it causes a decrease in the degree of sintering, the promotion of sintering, and the decrease in corrosion resistance.
【００１２】等のためであるが、不定形耐火物は一般に
骨材の粒度が大きくなるに従い、流動性が低下して水へ
の分散が困難となり、粉体原料との混合も困難となる。
図２は、粉体状をなす未使用の原料に対して配合した１
０〜４０mmの粒度範囲の使用済み耐火物の配合量と、流
動性発現に必要な混練水量との関係を示すものであり、
図３は、同じく３〜１０mmの粒度範囲の使用済み耐火物
の配合量との関係を示すものである。ここで流動性発現
に必要な混練水量とは、ＪＩＳ Ａ １１０１に規定す
るスランプ試験方法に則って求めたスランプ値が１５０
mm以上となる混練水量である。In general, as the size of the aggregate becomes larger, the amorphous refractory becomes less fluid, difficult to disperse in water, and difficult to mix with the powder raw material.
FIG. 2 shows the results obtained by blending 1 with the unused raw material in powder form.
It shows the relationship between the amount of the used refractory in the particle size range of 0 to 40 mm and the amount of kneading water necessary for developing fluidity,
FIG. 3 shows the relationship with the amount of used refractory having a particle size range of 3 to 10 mm. Here, the amount of kneading water necessary for the development of fluidity is defined as a slump value of 150 determined according to a slump test method specified in JIS A1101.
It is the amount of kneading water that is at least mm.
【００１３】図２及び図３に示されるように、１０〜４
０mmの粒度範囲の使用済み耐火物の方が３〜１０mmの範
囲ものを使用するよりも作業流動性を得るための混練水
量が大幅に増加することが分かる。本発明において、１
０〜４０mmの粒度範囲の使用済み耐火物の使用量を２０
重量％以下としたのは、図２に示されるように、強度特
性等の品質に悪影響を及ぼす混練水量の増加を最小限に
抑えるためである。As shown in FIG. 2 and FIG.
It can be seen that the used refractory having a particle size range of 0 mm greatly increases the amount of kneading water for obtaining working fluidity as compared with the use of a refractory having a range of 3 to 10 mm. In the present invention, 1
Reduce the amount of used refractories in the particle size range of 0 to 40 mm to 20
The reason for setting the weight% or less as shown in FIG. 2 is to minimize an increase in the amount of kneading water that adversely affects the quality such as strength characteristics.
【００１４】また３〜１０mmの粒度範囲のものを使用す
る理由は、 (1)１０〜４０mmの粒度範囲の使用済み耐火物は上述す
るように、それ自体に流動性がなく、しかも未使用の粉
体原料中において、１０〜４０mm程度の使用済み耐火物
が楔の役割をして粉体原料の流動性を低下させること。 (2)１０〜４０mmの粒度範囲の使用済み耐火物のみを使
用し、その使用量を増加させた場合は、混練ミキサー内
の機械部品の摩耗を促進させ、更には流し込み施工した
ときに細部への充填性を阻害したり、粒度偏析を起こす
原因となること。等のためで、その使用量を４０重量％
以下としたのは、次の理由による。The reason for using particles having a particle size range of 3 to 10 mm is as follows. (1) As described above, a used refractory having a particle size range of 10 to 40 mm has no fluidity itself and is not used. In a powder raw material, a used refractory of about 10 to 40 mm functions as a wedge to lower the fluidity of the powder raw material. (2) When only used refractories with a particle size range of 10 to 40 mm are used and the amount used is increased, the wear of the mechanical parts in the kneading mixer is promoted, It may impair the filling property of particles and cause particle size segregation. 40% by weight
The following is the reason for the following.
【００１５】(1)図３に示されるように、流し込み作業
に必要な流動性の低下を補うための混練水量の増加を最
小限に抑えるため、(2)図４は、３〜１０mm範囲の使用
済み耐火物の含有量と圧縮強さの関係を示す図で、同図
に示されるように、圧縮強さは１１０℃の乾燥処理では
添加量の増加に伴い低下する傾向にあるが、１０００℃
及び１５００℃の焼成では、添加量が増加すると、耐火
物中に含まれるスラグの反応による焼結性のため圧縮強
さが上昇する。焼結による圧縮強さの上昇は、熱スポー
リングによる亀裂・剥離の発生を助長し好ましくないた
め、等である。(1) As shown in FIG. 3, in order to minimize the increase in the amount of kneading water to compensate for the decrease in fluidity required for the pouring operation, (2) FIG. FIG. 4 is a graph showing the relationship between the content of the used refractory and the compressive strength. As shown in the figure, the compressive strength tends to decrease with an increase in the amount added in the drying treatment at 110 ° C. ° C
In the case of sintering at 1500 ° C., when the amount of addition increases, the compressive strength increases due to the sinterability due to the reaction of the slag contained in the refractory. An increase in the compressive strength due to sintering is not preferable because it promotes the occurrence of cracks and peeling due to thermal spalling.
【００１６】３〜１０mmの粒度範囲の使用済み耐火物
は、１０〜４０mmの粒度に破砕、整粒したときに同時に
発生するものを用いる。この１０mm以下の粒度の使用済
み耐火物中には、耐火物組織変化の少ない層である図１
の３層目が多く含まれる。すなわちこの３層目は気孔率
が大きく熱影響を余り受けていないため強度が弱く、粉
砕性がよいことから細粒が多く含まれる。Used refractories having a particle size range of 3 to 10 mm are those which are simultaneously generated when crushed and sized to a particle size of 10 to 40 mm. In the used refractory having a particle size of 10 mm or less, a layer in which refractory structure change is small is shown in FIG.
Of the third layer. That is, the third layer has a large porosity and is not significantly affected by heat, so that the third layer has a low strength and a good crushability, and thus contains many fine particles.
【００１７】一方、組織変化の大きなスラグ付着層及び
１層目は上記と逆に気孔率が小さくて強度が大であり、
粉砕性が悪いことから細粒は極少量含まれるのみであ
る。請求項２記載の発明は、請求項１記載の発明におい
て、使用済み耐火物はアルミナ含有量が４０〜８０重量
％、残部の主成分がシリカで構成されることを特徴とす
る。本発明において、使用済み耐火物のアルミナ含有量
を４０〜８０重量％に限定した理由は次の結果によるも
のである。On the other hand, the slag-adhered layer and the first layer having a large structural change have a small porosity and a large strength, contrary to the above.
Fine particles are contained only in a very small amount due to poor pulverizability. The invention according to claim 2 is characterized in that, in the invention according to claim 1, the used refractory has an alumina content of 40 to 80% by weight, and the remaining main component is composed of silica. In the present invention, the reason why the alumina content of the used refractory is limited to 40 to 80% by weight is as follows.
【００１８】図５は、アルミナ成分値の異なる使用済耐
火物の溶損性を評価したもので、アルミナ成分の異なる
それぞれの使用済の耐火物を破砕し、３〜１０mmの粒度
に調整したものを４０重量％と未使用のアルミナ−シリ
カ質の耐火物を６０重量％配合した試料を高周波誘導炉
の内側に張りつけて、高周波誘導炉に塩基度CaO/SiO2≒
2.9で、トータルFe≒13重量％のスラグと鋼を装入して
溶解し、溶鋼の温度を１６５０℃で２時間保持して試料
の侵食状態を調査した結果を示す。FIG. 5 shows the evaluation results of the erosion resistance of used refractories having different alumina component values. The used refractories having different alumina components were crushed and adjusted to a particle size of 3 to 10 mm. Of a mixture of 40% by weight and 60% by weight of an unused alumina-silica refractory was adhered to the inside of a high frequency induction furnace, and the basicity was CaO / SiO 2 ≒ in the high frequency induction furnace.
In 2.9, the results of investigating the erosion state of the sample while charging and melting a slag and steel having a total Fe ≒ 13% by weight and maintaining the temperature of the molten steel at 1650 ° C. for 2 hours are shown.
【００１９】図６は、前記した溶損性の評価に用いた試
料を６５×６５×６５mmの立方体に成形し、乾燥した
後、温度１２００℃に保った電気炉に装入し、３０分間
加熱したのち直ちに常温の水に１５分間浸けて水冷する
操作を繰返したときに、耐火物に熱スポールによる亀裂
が発生するまでの繰返し回数と使用済み耐火物中のアル
ミナ成分値との関係を示すものである。図５及び図６に
示されるように、アルミナ含有量が４０重量％未満の場
合、耐熱スポール性は向上するが、耐蝕性が低下するの
に対し、アルミナ含有量が８０重量％を超えると、耐蝕
性は向上するが、熱スポールによる亀裂や剥離の発生が
多くなる。FIG. 6 shows that the sample used for the evaluation of erosion resistance was formed into a cube of 65 × 65 × 65 mm, dried, charged in an electric furnace kept at 1200 ° C., and heated for 30 minutes. This shows the relationship between the number of repetitions until cracks due to thermal spalls occur in the refractory and the alumina component value in the used refractory when the operation of immersing in water at room temperature for 15 minutes and repeating water cooling is repeated immediately It is. As shown in FIGS. 5 and 6, when the alumina content is less than 40% by weight, the heat-resistant spalling property is improved, but the corrosion resistance is reduced. On the other hand, when the alumina content exceeds 80% by weight, Corrosion resistance is improved, but cracks and peeling due to thermal spall increase.
【００２０】請求項３記載の発明は、請求項１又は２記
載の発明において、平均粒径が５μm 以下のアルミナ原
料とシリカ原料を合計量で１０〜２０重量％、アルミナ
セメントを５〜１０重量％添加したことを特徴とする。
本発明によれば、使用済み耐火物の使用による流動性の
低下及び強度特性の低下を最小限に抑えることができ
る。The invention according to claim 3 is the invention according to claim 1 or 2, wherein the alumina raw material and the silica raw material having an average particle diameter of 5 μm or less are 10 to 20% by weight in total and 5 to 10% by weight of alumina cement. %.
According to the present invention, it is possible to minimize a decrease in fluidity and a decrease in strength characteristics due to use of a used refractory.
【００２１】本発明において、平均粒径が５μm 以下の
アルミナ原料とシリカ原料（シリカフラワー）の合計量
を１０〜２０重量％としたのは次の理由による。図７
は、１０〜４０mmの粒度範囲の使用済み耐火物を２０重
量％、同じく３〜１０mmの粒度範囲のものを４０重量％
使用した原料に平均粒径５μm 以下のアルミナ原料とシ
リカ原料を加えた場合のアルミナ原料とシリカ原料の含
有量と流動性発現に必要な混練水量との関係を示す図で
あり、図８は圧縮強さの関係を示す図で、図７及び図８
に示されるように、アルミナ原料とシリカ原料の含有量
が１０重量％未満では流動性発現に必要な混練水量の減
少及び強度の低下を補うには不十分である。In the present invention, the total amount of the alumina raw material and the silica raw material (silica flour) having an average particle diameter of 5 μm or less is set to 10 to 20% by weight for the following reason. FIG.
Is 20% by weight of used refractory having a particle size range of 10 to 40mm, and 40% by weight of a refractory having a particle size range of 3 to 10mm.
FIG. 8 is a diagram showing the relationship between the contents of the alumina raw material and the silica raw material and the amount of kneading water necessary for developing the fluidity when an alumina raw material having an average particle size of 5 μm or less and a silica raw material are added to the raw materials used. FIGS. 7 and 8 are diagrams showing the relationship between the strengths.
As shown in the above, if the content of the alumina raw material and the silica raw material is less than 10% by weight, it is insufficient to compensate for the decrease in the amount of kneading water and the decrease in the strength required for developing the fluidity.
【００２２】一方、アルミナ原料とシリカ原料の含有量
が２０重量％を越えると、混練水量の減少と強度向上に
は効果があるが、高価な原料であるためコストアップと
なること、鋼中介在物生成防止の目的で耐火物表面に吹
付け使用しているマグネシア質コーティング材との焼結
反応が促進され、使用後の除去作業が困難になること、
使用済み耐火物中に含まれているスラグ成分（CaO.SiO2
等）と反応し、CaO ・Al2O3・2SiO2や2CaO・Al2O3 ・Si
O2及びクリストバライトの生成による焼結が促進され、
亀裂や剥離が発生し易く安定した耐用性が得られなくな
ること等の問題があり、好ましくない。On the other hand, if the content of the alumina raw material and the silica raw material exceeds 20% by weight, the kneading water amount is reduced and the strength is improved, but the cost is increased because the raw material is expensive. The sintering reaction with the magnesia-based coating material that is sprayed onto the refractory surface for the purpose of preventing product formation is promoted, and removal work after use becomes difficult,
Slag components (CaO.SiO 2 ) contained in used refractories
Etc.) and react with CaO.Al 2 O 3 .2SiO 2 or 2CaO.Al 2 O 3 .Si
Sintering by generation of O 2 and cristobalite is promoted,
There is a problem that cracks and peeling easily occur and stable durability cannot be obtained, which is not preferable.
【００２３】本発明で用いられるアルミナセメントは、
CaO 含有量が２０重量％以下の高アルミナセメントであ
る。アルミナセメントの使用量を５〜１０重量％とした
のは次の理由による。図９は、アルミナセメントの含有
量と圧縮強さの関係を示す図で、同図に示されるように
アルミナセメントの含有量が５重量％未満では強度付与
に不十分であり、また１０重量％を越えると、コスト高
となるうえ、使用済み耐火物中に含まれるスラグ成分と
反応し、CaO ・ Al2O3・2SiO2 や2CaO・Al2O3 ・SiO 及
び3CaO・2SiO等の生成による焼結が促進され、亀裂や剥
離の発生を助長する。The alumina cement used in the present invention is:
It is a high alumina cement having a CaO content of 20% by weight or less. The use amount of the alumina cement was set to 5 to 10% by weight for the following reason. FIG. 9 is a graph showing the relationship between the content of alumina cement and the compressive strength. As shown in FIG. 9, when the content of alumina cement is less than 5% by weight, it is insufficient to impart strength, and 10% by weight. If it exceeds, the cost will increase, and it will react with the slag component contained in the used refractory and form CaO.Al 2 O 3 .2SiO 2 and 2CaO.Al 2 O 3 .SiO and 3CaO.2SiO Sintering is promoted, and cracks and peeling are promoted.
【００２４】[0024]
【実施例】実施例１ アルミナ−シリカ質の未使用の耐火材で、３mm以下の粒
度のもの３１重量％、平均粒径５μm 以下のもの１６重
量％、高アルミナセメント７重量％よりなる原料に対
し、アルミナ６０．７重量％、シリカ２８．４重量％を
含む使用済み耐火物を破砕整粒し、１０〜４０mmの粒度
範囲のもの１０重量％、３〜１０mmの範囲もの３６重量
％を配合し、これに更に、金属ファイバーを外付けで２
重量％添加してなる耐火材に流動性発現に必要な水を
７．４重量％加えてミキサーにて混練し、型に流し込ん
で１００mmφ、高さ２００mmの円柱状試料を得た。そし
て電気炉に入れ１５００℃で３時間焼成したのち圧縮試
験機に掛け、圧縮試験を行った。その結果、圧縮強さは
７７MPa であった。また上述するようにして得られた耐
火材をタンディッシュの内張り用流し込み材に使用し、
実機テストを行った。その結果、後述の比較例１に示す
従来品の耐用（繰返し使用回数）を１００とした場合の
耐用性比率は９２であった。Example 1 A raw material comprising 31% by weight of unused alumina-silica refractory having a particle size of 3 mm or less, 16% by weight having an average particle size of 5 μm or less, and 7% by weight of high alumina cement. On the other hand, used refractories containing 60.7% by weight of alumina and 28.4% by weight of silica were crushed and sized, and 10% by weight in a particle size range of 10 to 40mm and 36% by weight in a range of 3 to 10mm were compounded. In addition to this, an external metal fiber
To the refractory material added in an amount of 7.4% by weight, 7.4% by weight of water necessary for developing fluidity was added, kneaded with a mixer, and poured into a mold to obtain a columnar sample having a diameter of 100 mm and a height of 200 mm. Then, it was placed in an electric furnace and calcined at 1500 ° C. for 3 hours, and then set in a compression tester to perform a compression test. As a result, the compression strength was 77 MPa. Also, using the refractory material obtained as described above as a casting material for lining tundish,
An actual machine test was performed. As a result, the durability ratio was 92 when the service life (the number of times of repeated use) of the conventional product shown in Comparative Example 1 described later was 100.
【００２５】実施例２ ３mm以下の粒度のもの１７重量％、平均粒径５μm 以下
のもの１８重量％、高アルミナセメント１０重量％より
なるアルミナ−シリカ質の未使用の耐火材に対し、実施
例１と同じ使用済み耐火物を破砕・整粒して得た１０〜
４０mm粒度範囲のもの１５重量％、３〜１０mm粒度範囲
のもの４０重量％を配合し、これに更に外付けで金属フ
ァイバーを２重量％添加してなる耐火材に流動性発現に
必要な水７．７重量％を加えて混練したのち、実施例１
と同様の方法で圧縮試験及びタンディッシュでの実機テ
ストを行った。その結果、圧縮強さは８１MPa 、耐用性
比率は９０であった。Example 2 An alumina-siliceous refractory material consisting of 17% by weight having a particle size of 3 mm or less, 18% by weight having an average particle size of 5 μm or less, and 10% by weight of a high alumina cement was used. 10 obtained by crushing and sizing the same used refractory as in 1
15% by weight having a particle size range of 40 mm, 40% by weight having a particle size range of 3 to 10 mm, and 2% by weight of an external metal fiber are further added thereto. Example 1 after adding 0.7% by weight and kneading.
A compression test and an actual machine test using a tundish were conducted in the same manner as in the above. As a result, the compression strength was 81 MPa and the durability ratio was 90.
【００２６】実施例３ ３mm以下の粒度のもの１４重量％、平均粒径５μm 以下
のもの１８重量％、高アルミナセメント８重量％よりな
るアルミナ−シリカ質の未使用の耐火材に対し、実施例
１と同じ使用済み耐火物を破砕・整粒して得た１０〜４
０mm粒度範囲のもの２０重量％、３〜１０mm粒度範囲の
もの４０重量％を配合し、更に金属ファイバーを外付け
で２重量％添加してなる耐火材に流動性発現に必要な水
７．９重量％を加えて混練したのち、実施例１と同様の
方法で圧縮試験及びタンディッシュでの実機テストを行
った。その結果、圧縮強さは７５MPa 、耐用性比率は８
９であった。Example 3 An alumina-siliceous refractory material consisting of 14% by weight having a particle size of 3 mm or less, 18% by weight having an average particle size of 5 μm or less, and 8% by weight of a high alumina cement was used. 10-4 obtained by crushing and sizing the same used refractory as in 1
20% by weight of a particle size range of 0 mm and 40% by weight of a particle size range of 3 to 10 mm are added, and 2% by weight of an external metal fiber is added. After kneading by adding weight%, a compression test and an actual machine test with a tundish were performed in the same manner as in Example 1. As a result, the compression strength is 75 MPa, and the durability ratio is 8
Nine.
【００２７】実施例４ ３〜１０mmの粒度範囲のもの３重量％、３mm以下の粒度
のもの３５重量％、平均粒径５μm 以下のもの１５重量
％、高アルミナセメント７重量％よりなるアルミナ−シ
リカ質の未使用の耐火材に対し、実施例１と同じ使用済
み耐火物を破砕・整粒して得た１０〜４０mm粒度範囲の
もの５重量％、３〜１０mm粒度範囲のもの３５重量％を
配合し、更に金属ファイバーを外付けで２重量％添加し
てなる耐火材に流動性発現に必要な水７．５重量％を加
えて混練したのち、実施例１と同様の方法で圧縮試験及
びタンディッシュでの実機テストを行った。その結果、
圧縮強さは６９MPa 、耐用性比率は９３であった。Example 4 Alumina-silica comprising 3% by weight having a particle size range of 3 to 10 mm, 35% by weight having a particle size of 3 mm or less, 15% by weight having an average particle size of 5 μm or less, and 7% by weight of high alumina cement. 5% by weight of 10 to 40 mm particle size range obtained by crushing and sizing the same used refractory as in Example 1 to 35% by weight of the same unused refractory material. After blending, further adding 7.5% by weight of water necessary for developing fluidity to a refractory material in which metal fibers are externally added at 2% by weight, and kneading the mixture, the same compression test as in Example 1 was performed. An actual machine test was performed in a tundish. as a result,
The compression strength was 69 MPa and the durability ratio was 93.
【００２８】実施例５ ３〜１０mmの粒度範囲のもの４５重量％、平均粒径５μ
m 以下のもの１４重量％、高アルミナセメント６重量％
よりなるアルミナ−シリカ質の未使用の耐火材に対し、
実施例１と同じ使用済み耐火物を破砕・整粒して得た１
０〜４０mm粒度範囲のもの１０重量％、３〜１０mmの粒
度範囲のもの２５重量％を配合し、更に金属ファイバー
を外付けで２重量％添加してなる耐火材に流動性発現に
必要な水７．０重量％を加えて混練したのち、実施例１
と同様の方法で圧縮試験及びタンディッシュでの実機テ
ストを行った。その結果、圧縮強さは６１MPa 、耐用性
比率は９５であった。Example 5: 45% by weight in a particle size range of 3 to 10 mm, average particle size: 5 μm
m 14% by weight, high alumina cement 6% by weight
Alumina-silica used refractory material consisting of:
1 obtained by crushing and sizing the same used refractory as in Example 1
10% by weight in a particle size range of 0 to 40mm, 25% by weight in a particle size range of 3 to 10mm, and 2% by weight of an externally added metal fiber are added to the refractory material to provide water necessary for developing fluidity. After adding 7.0% by weight and kneading, Example 1
A compression test and an actual machine test using a tundish were conducted in the same manner as in the above. As a result, the compression strength was 61 MPa and the durability ratio was 95.
【００２９】比較例１（従来品） ３〜１０mmの粒度範囲のもの４０重量％、３mm以下の粒
度のもの４８重量％、平均粒径５μm 以下のもの８重量
％、高アルミナセメント４重量％よりなるアルミナ−シ
リカ質の未使用の耐火材に金属ファイバー２重量％を外
付けで添加し、これに流動性発現に必要な水７．１重量
％を加えて混練したのち、実施例１と同様の方法で圧縮
試験及びタンディッシュでの実機テストを行った。その
結果、圧縮強さは７５MPa であり、このときの繰返し使
用回数（耐用）を１００とした。Comparative Example 1 (Conventional product) 40% by weight having a particle size range of 3 to 10 mm, 48% by weight having a particle size of 3 mm or less, 8% by weight having an average particle size of 5 μm or less, and 4% by weight of high alumina cement 2% by weight of a metal fiber was externally added to an unused refractory material of alumina-silica, and 7.1% by weight of water necessary for developing fluidity was added and kneaded, and then the same as in Example 1. The compression test and the actual machine test in the tundish were performed by the methods described in the above. As a result, the compressive strength was 75 MPa, and the number of repeated use (durable) at this time was set to 100.
【００３０】比較例２ ３〜１０mmの粒度範囲のもの３８重量％、３mm以下の粒
度のもの４２重量％、平均粒径５μm 以下のもの１０重
量％、高アルミナセメント５重量％よりなるアルミナ−
シリカ質の未使用の耐火材に、実施例１と同じ使用済み
耐火物を破砕、整粒して得た１０〜４０mmの粒度範囲の
もの５重量％を配合して更に金属ファイバー２重量％を
外付けで添加し、これに流動性発現に必要な水６．９重
量％を加えて混練したのち、実施例１と同様の方法で圧
縮試験及びタンディッシュでの実機テストを行った。そ
の結果、圧縮強さは７２MPa であり、耐用性比率は９９
であった。Comparative Example 2 38% by weight having a particle size range of 3 to 10 mm, 42% by weight having a particle size of 3 mm or less, 10% by weight having an average particle size of 5 μm or less, and 5% by weight of high alumina cement
5% by weight of a refractory material used in Example 1, which was obtained by crushing and sizing the same used refractory as in Example 1 and having a particle size range of 10 to 40 mm, was mixed with 2% by weight of metal fibers. The mixture was externally added, and 6.9% by weight of water necessary for the development of fluidity was added thereto. After kneading, a compression test and a real machine test in a tundish were performed in the same manner as in Example 1. As a result, the compressive strength was 72 MPa, and the durability ratio was 99%.
Met.
【００３１】比較例３ ３〜１０mmの粒度範囲のもの３４重量％、３mm以下の粒
度のもの３６重量％、平均粒径５μm 以下のもの１０重
量％、高アルミナセメント５重量％よりなるアルミナ−
シリカ質の未使用の耐火材に、実施例１と同じ使用済み
耐火物を破砕、整粒して得た１０〜４０mmの粒度範囲の
もの１５重量％を配合して更に金属ファイバー２重量％
を外付けで添加し、これに流動性発現に必要な水６．５
重量％を加えて混練したのち、実施例１と同様の方法で
圧縮試験及びタンディッシュでの実機テストを行った。
その結果、圧縮強さは６８MPa であり、耐用性比率は９
８であった。Comparative Example 3 34% by weight having a particle size range of 3 to 10 mm, 36% by weight having a particle size of 3 mm or less, 10% by weight having an average particle size of 5 μm or less, and 5% by weight of high alumina cement
15% by weight of a refractory material used in Example 1 having a particle size range of 10 to 40 mm obtained by crushing and sizing the same used refractory material as in Example 1 was further mixed with 2% by weight of metal fiber.
Was added externally, and water 6.5 required for developing fluidity was added thereto.
After kneading by adding weight%, a compression test and an actual machine test with a tundish were performed in the same manner as in Example 1.
As a result, the compressive strength was 68 MPa, and the durability ratio was 9
It was 8.
【００３２】比較例４ ３〜１０mmの粒度範囲のもの３２重量％、３mm以下の粒
度のもの３０重量％、平均粒径５μm 以下のもの１２重
量％、高アルミナセメント５重量％よりなるアルミナ−
シリカ質の未使用の耐火材に、実施例１と同じ使用済み
耐火物を破砕、整粒して得た１０〜４０mmの粒度範囲の
もの２０重量％を配合して更に金属ファイバー２重量％
を外付けで添加し、これに流動性発現に必要な水６．５
重量％を加えて混練したのち、実施例１と同様の方法で
圧縮試験及びタンディッシュでの実機テストを行った。
その結果、圧縮強さは６４MPa であり、耐用性比率は９
６であった。以上の結果を以下の表２に示す。Comparative Example 4 Alumina comprising 32% by weight having a particle size range of 3 to 10 mm, 30% by weight having a particle size of 3 mm or less, 12% by weight having an average particle size of 5 μm or less, and 5% by weight of high alumina cement.
Silica-based unused refractory material was mixed with 20% by weight of the same used refractory as in Example 1 having a particle size range of 10 to 40 mm obtained by crushing and sizing, and 2% by weight of metal fiber.
Was added externally, and water 6.5 required for developing fluidity was added thereto.
After kneading by adding weight%, a compression test and an actual machine test using a tundish were performed in the same manner as in Example 1.
As a result, the compression strength was 64 MPa and the durability ratio was 9
It was 6. The above results are shown in Table 2 below.
【００３３】[0033]
【表２】 表２に見られるように、破砕整粒した使用済み耐火物を
最大６０重量％使用した場合でも耐用性を約１０％の低
下にとゞめることができ、コスト及び耐用性の面でも充
分使用可能であることが判明した。[Table 2] As can be seen from Table 2, even when the crushed and sized and used refractory is used at a maximum of 60% by weight, the durability can be reduced to about 10%, and the cost and the durability are sufficient. It turned out to be usable.
【００３４】[0034]
【発明の効果】本発明によれば、使用済み耐火物を破砕
整粒するだけの処理で表面改質を行うことなく使用で
き、使用量も最大６０重量％と従来に比べ格段に多くな
り、低コストの処理費用で廃棄物のリサイクル使用が可
能となる。またアルミナ−シリカ質の不定形耐火物とし
てアルミナ４０〜８０重量％、残部の主成分がシリカで
構成されるものを用いることにより、耐蝕性や耐熱スポ
ール性の低下を最小限にとゞめることができる。According to the present invention, used refractories can be used without surface modification only by crushing and sizing the used refractories, and the amount of use is up to 60% by weight, which is much larger than in the past. Recyclable waste can be used at low cost. In addition, the use of an alumina-silica amorphous refractory composed of 40 to 80% by weight of alumina and the remainder of which is mainly composed of silica minimizes the deterioration of corrosion resistance and heat spall resistance. be able to.
【００３５】また平均粒径５μm 以下のアルミナ原料と
シリカ原料及びアルミナセメント量を調整することによ
り、使用済み耐火物の使用による流動性の低下及び強度
特性の低下を最小限に抑えることができる。By adjusting the amount of the alumina raw material having an average particle size of 5 μm or less, the amount of the silica raw material and the amount of the alumina cement, it is possible to minimize a decrease in fluidity and a decrease in strength characteristics due to the use of the used refractory.
【図面の簡単な説明】[Brief description of the drawings]
【図１】使用済み耐火物の構成を示す断面図。FIG. 1 is a sectional view showing a configuration of a used refractory.
【図２】１０〜４０mmの粒度範囲の使用済み耐火物の配
合量と流動性発現に必要な水量との関係を示すグラフ。FIG. 2 is a graph showing the relationship between the amount of used refractory in the particle size range of 10 to 40 mm and the amount of water necessary for developing fluidity.
【図３】３〜１０mmの粒度範囲の使用済み耐火物の配合
量と流動性発現に必要な水量との関係を示すグラフ。FIG. 3 is a graph showing the relationship between the amount of used refractory in the particle size range of 3 to 10 mm and the amount of water necessary for developing fluidity.
【図４】３〜１０mmの粒度範囲の使用済み耐火物の配合
量と圧縮強さの関係を示すグラフ。FIG. 4 is a graph showing the relationship between the amount of used refractory having a particle size range of 3 to 10 mm and the compressive strength.
【図５】使用済み耐火物中のアルミナ含有量と溶損比率
の関係を示すグラフ。FIG. 5 is a graph showing a relationship between an alumina content in a used refractory and a erosion ratio.
【図６】使用済み耐火物中のアルミナ含有量と亀裂が発
生するまでの加熱冷却回数の関係を示すグラフ。FIG. 6 is a graph showing the relationship between the alumina content in a used refractory and the number of heating / cooling times until cracks are generated.
【図７】平均粒径５μm 以下のアルミナ原料とシリカ原
料の含有量と流動性発現に必要な水量との関係を示すグ
ラフ。FIG. 7 is a graph showing the relationship between the content of an alumina raw material having an average particle size of 5 μm or less and a silica raw material and the amount of water necessary for developing fluidity.
【図８】平均粒径５μm 以下のアルミナ原料とシリカ原
料の含有量と圧縮強さの関係を示すグラフ。FIG. 8 is a graph showing the relationship between the content of an alumina raw material having an average particle size of 5 μm or less and a silica raw material and compressive strength.
【図９】高アルミナセメントの含有量と圧縮強さの関係
を示すグラフ。FIG. 9 is a graph showing the relationship between the content of high alumina cement and compressive strength.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 田中 基博 広島県豊田郡安芸津町三津5563−４ 昭和 鉱業株式会社安芸津工場内 (72)発明者 上垣 博 広島県豊田郡安芸津町三津5563−４ 昭和 鉱業株式会社安芸津工場内 Ｆターム(参考） 4G033 AA02 AA06 AB02 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Motohiro Tanaka, Inventor 5563-4 Mitsu, Atsutsu-cho, Toyota-gun, Hiroshima Prefecture Showa Mining Co., Ltd. F-term in Akitsu Factory Co., Ltd. (reference) 4G033 AA02 AA06 AB02
Claims (3)
て、アルミナーシリカ質の使用済み耐火物を破砕し、１
０〜４０mmの粒度範囲のもの２０重量％以下、３〜１０
mmの粒度範囲のもの４０重量％以下、合計６０重量％以
下配合したことを特徴とする不定形耐火物。1. An alumina-silica amorphous refractory, which comprises crushing alumina-silica used refractories.
20% by weight or less in a particle size range of 0 to 40 mm, 3 to 10
An amorphous refractory characterized in that it has a particle size range of 40 mm% or less, and a total of 60% by weight or less.
８０重量％、残部の主成分がシリカで構成されることを
特徴とする請求項１記載の不定形耐火物。2. The used refractory has an alumina content of 40 to 40.
2. The amorphous refractory according to claim 1, wherein 80% by weight and the remaining main component are composed of silica.
リカ原料を合計量で１０〜２０重量％、アルミナセメン
トを５〜１０重量％添加したことを特徴とする請求項１
又は２記載の不定形耐火物。3. The method according to claim 1, wherein a total of 10 to 20% by weight of alumina raw material and silica raw material having an average particle diameter of 5 μm or less and 5 to 10% by weight of alumina cement are added.
Or the amorphous refractory according to 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31197398A JP4484173B2 (en) | 1998-11-02 | 1998-11-02 | Indefinite refractory |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31197398A JP4484173B2 (en) | 1998-11-02 | 1998-11-02 | Indefinite refractory |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000143355A true JP2000143355A (en) | 2000-05-23 |
| JP4484173B2 JP4484173B2 (en) | 2010-06-16 |
Family
ID=18023674
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31197398A Expired - Lifetime JP4484173B2 (en) | 1998-11-02 | 1998-11-02 | Indefinite refractory |
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| Country | Link |
|---|---|
| JP (1) | JP4484173B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007261874A (en) * | 2006-03-28 | 2007-10-11 | Nippon Steel Corp | Method for recycling used refractory, recycled refractory raw material for monolithic refractory produced using the same, and monolithic refractory |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH026373A (en) * | 1988-06-24 | 1990-01-10 | Kawasaki Refract Co Ltd | Cast amorphous refractory |
| JPH06345548A (en) * | 1993-06-08 | 1994-12-20 | Sumitomo Metal Ind Ltd | Production of pouring material using refractory waste material, molding therefor and production of molding |
| JPH082975A (en) * | 1994-06-20 | 1996-01-09 | Harima Ceramic Co Ltd | Refractory for casting application |
| JPH08188475A (en) * | 1995-01-09 | 1996-07-23 | Daido Steel Co Ltd | High-alumina refractory |
| JPH0952169A (en) * | 1995-08-12 | 1997-02-25 | Harima Ceramic Co Ltd | Refractory for tuyere of molten steel container |
| JPH09165270A (en) * | 1995-12-13 | 1997-06-24 | Nippon Steel Corp | Alumina casting monolithic refractory and production of formed body using the refractory |
| JPH09328357A (en) * | 1996-06-04 | 1997-12-22 | Yotai Refractories Co Ltd | High alumina brick for rotary kiln and its production |
| JPH1017373A (en) * | 1996-06-28 | 1998-01-20 | Harima Ceramic Co Ltd | Monolithic refractory of lance for preliminary treatment of molten pig-iron |
-
1998
- 1998-11-02 JP JP31197398A patent/JP4484173B2/en not_active Expired - Lifetime
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH026373A (en) * | 1988-06-24 | 1990-01-10 | Kawasaki Refract Co Ltd | Cast amorphous refractory |
| JPH06345548A (en) * | 1993-06-08 | 1994-12-20 | Sumitomo Metal Ind Ltd | Production of pouring material using refractory waste material, molding therefor and production of molding |
| JPH082975A (en) * | 1994-06-20 | 1996-01-09 | Harima Ceramic Co Ltd | Refractory for casting application |
| JPH08188475A (en) * | 1995-01-09 | 1996-07-23 | Daido Steel Co Ltd | High-alumina refractory |
| JPH0952169A (en) * | 1995-08-12 | 1997-02-25 | Harima Ceramic Co Ltd | Refractory for tuyere of molten steel container |
| JPH09165270A (en) * | 1995-12-13 | 1997-06-24 | Nippon Steel Corp | Alumina casting monolithic refractory and production of formed body using the refractory |
| JPH09328357A (en) * | 1996-06-04 | 1997-12-22 | Yotai Refractories Co Ltd | High alumina brick for rotary kiln and its production |
| JPH1017373A (en) * | 1996-06-28 | 1998-01-20 | Harima Ceramic Co Ltd | Monolithic refractory of lance for preliminary treatment of molten pig-iron |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007261874A (en) * | 2006-03-28 | 2007-10-11 | Nippon Steel Corp | Method for recycling used refractory, recycled refractory raw material for monolithic refractory produced using the same, and monolithic refractory |
| JP4555793B2 (en) * | 2006-03-28 | 2010-10-06 | 新日本製鐵株式会社 | How to recycle used refractories |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4484173B2 (en) | 2010-06-16 |
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