JP2000351678A - Refractory material with excellent spalling resistance and erosion resistance - Google Patents
Refractory material with excellent spalling resistance and erosion resistanceInfo
- Publication number
- JP2000351678A JP2000351678A JP11165599A JP16559999A JP2000351678A JP 2000351678 A JP2000351678 A JP 2000351678A JP 11165599 A JP11165599 A JP 11165599A JP 16559999 A JP16559999 A JP 16559999A JP 2000351678 A JP2000351678 A JP 2000351678A
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- Prior art keywords
- refractory
- plate
- piece
- resistance
- raw material
- 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.)
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、煉瓦や不定形耐火
物の耐スポーリングや耐溶損性を高めて、耐火物の長寿
命化を図ることができる耐スポーリング・耐溶損性に優
れた耐火物に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides an improved spalling and erosion resistance that can increase the spalling and erosion resistance of bricks and irregular-shaped refractories and extend the life of the refractories. Refractories.
【０００２】[0002]
【従来の技術】従来、精錬炉あるいは二次精錬炉、取鍋
や樋等には、耐火煉瓦や不定形耐火物等の耐火物が内張
りされている。この耐火物は、溶鉄やスラグによって溶
損されたり、加熱・冷却によって使用中にスポーリング
等を起こして、局部的あるいは全体が損耗する。その結
果、精錬炉や二次精錬炉等の炉寿命が短くなり、生産性
が低下し、耐火物のメンテナンスコストが上昇する。従
って、損耗した部位に吹き付けや鏝塗り等の補修を行っ
たり、耐火原料の選択や補修方法の改善等を行って、耐
火物や炉寿命の延長を図っているが、精錬等の使用条件
の過酷化や耐火物のいっそうの高品質化が指向されてお
り、スポーリングや溶損に対して十分な特性を有する耐
火物が求められている。この対策として、例えば、特開
平１−３３０７５号公報に記載されているように、粘土
質５１〜４０重量％と粗粒状の耐火材４０〜４８重量％
に綿状のセラミックファイバーを９〜１２重量％配合し
て、成形耐火物の急熱・急冷の熱衝撃に対する強度を上
げ破損を防止している。また、特開平８−１５７２７０
号公報には、厚みが０．２〜２ｍｍの板状耐火骨材、あ
るいはこの板状耐火骨材（板状片）の長さもしくは幅／
厚みを２〜５０にしたものを３〜７０重量％配合し、耐
スポーリング性を高め、同時に、付着物の形成と板状耐
火骨材のスパイキング効果によって、マトリックスの先
行溶損を防止することが行われている。2. Description of the Related Art Conventionally, refractory such as refractory bricks and irregular refractories are lined in a refining furnace or a secondary refining furnace, a ladle or a gutter. This refractory is damaged by molten iron or slag, or spalled during use due to heating or cooling, and is locally or entirely worn. As a result, the furnace life of a refining furnace, a secondary refining furnace, or the like is shortened, productivity is reduced, and maintenance costs for refractories are increased. Therefore, repairs such as spraying and ironing are performed on worn parts, and selection of refractory materials and improvement of repair methods are performed to extend the life of refractories and furnaces. There is a demand for severer and higher quality refractories, and refractories having sufficient properties against spalling and melting are demanded. As a countermeasure, for example, as described in JP-A-1-33075, clay is 51 to 40% by weight and coarse-grained refractory is 40 to 48% by weight.
9 to 12% by weight of cotton-like ceramic fiber is added to the molded refractory to increase the strength against rapid thermal shock and rapid thermal shock to prevent breakage. Also, JP-A-8-157270
The publication discloses a plate-like refractory aggregate having a thickness of 0.2 to 2 mm, or the length or width of the plate-like refractory aggregate (plate-like piece) /
A mixture having a thickness of 2 to 50 is added in an amount of 3 to 70% by weight to enhance spalling resistance, and at the same time, prevent the matrix from being prematurely damaged by the formation of deposits and the spiking effect of the plate-like refractory aggregate. That is being done.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、特開平
１−３３０７５号公報では、セラミックファイバーを添
加しているため、粘土質及び粗粒状からなる耐火材に混
合し難く混練に時間を要し、混練を十分に行っても均一
に分散させることが困難である。しかも、混練する際
に、添加した水分をセラミックファイバーが吸収するた
め、多めに水分を添加する必要があり、耐火物の乾燥時
に亀裂が生じたり、耐火物の気孔率が上昇して、耐火物
の強度や耐食性が悪くなる等の問題がある。更に、セラ
ミックスファイバー等の繊維系の素材では、耐火物の弾
性率を低下させて耐スポーリング性を高めるので、耐火
物の密度が低くなりスラグや溶鋼に対する耐溶損性が悪
くなり、容器や精錬炉の耐用性の低下、生産性の低下、
耐火物コストの上昇を招く。また、耐火物の曲げ強度も
十分に向上できず、急熱・急冷を繰り返す場合に、耐火
物のスポーリング等を抑制することができない等の問題
がある。また、特開平８−１５７２７０号公報では、板
状耐火骨材を用いることにより、比較的少ない水分でも
混合でき、流し込み後の耐火物の均一性を向上できる利
点を有するが、板状耐火骨材の具備する特性等によっ
て、効果が大きく異なり、急熱・急冷を繰り返す精錬炉
や二次精錬炉等に用いても必ずしも効果が得られず、例
えば、板状耐火骨材を境にした剥落やスポーリングが生
じたり、耐火物そのものの強度が低下して耐火物の寿命
が大幅に低下することが判明した。更に、板状耐火骨材
の融点によっては、耐食性が悪くなってスパイキング効
果も低下し、稼働面の耐火骨材が脱落を招き、耐火物の
寿命を安定して向上できない等の問題もある。However, in Japanese Unexamined Patent Publication No. Hei. 1-333075, since ceramic fibers are added, it is difficult to mix them with a refractory material composed of clay and coarse particles, and it takes a long time for kneading. However, it is difficult to uniformly disperse even if it is carried out sufficiently. Moreover, since the ceramic fiber absorbs the added water during kneading, it is necessary to add a relatively large amount of water, and cracks occur when the refractory dries, and the porosity of the refractory increases, and the refractory increases. However, there is a problem that the strength and corrosion resistance of the steel are deteriorated. Furthermore, in the case of fibrous materials such as ceramic fibers, the elasticity of the refractory is reduced to increase the spalling resistance, so that the density of the refractory decreases, the erosion resistance to slag and molten steel deteriorates, and the container Reduced furnace life, reduced productivity,
This leads to an increase in refractory costs. Further, there is a problem that the bending strength of the refractory cannot be sufficiently improved, and spalling or the like of the refractory cannot be suppressed when rapid heating and rapid cooling are repeated. Japanese Patent Application Laid-Open No. 8-157270 discloses that the use of a plate-like refractory aggregate has the advantage that it is possible to mix even a relatively small amount of water and to improve the uniformity of the refractory after casting. The effect varies greatly depending on the characteristics of the material, etc., and the effect is not necessarily obtained even when used in a refining furnace or a secondary refining furnace that repeats rapid heating and quenching. It has been found that spalling occurs and the strength of the refractory itself is reduced, thereby greatly reducing the life of the refractory. Further, depending on the melting point of the plate-like refractory aggregate, there is also a problem that the corrosion resistance is deteriorated and the spiking effect is reduced, the refractory aggregate on the working surface is dropped, and the life of the refractory cannot be stably improved. .
【０００４】本発明はかかる事情に鑑みてなされたもの
で、耐火物に板状片を均一に分散させて溶損やスポーリ
ングを安定して抑制することができる耐スポーリング・
耐溶損性に優れた耐火物を提供することを目的とする。[0004] The present invention has been made in view of such circumstances, and a spalling-resistant material capable of uniformly dispersing plate-like pieces in a refractory to stably suppress erosion and spalling.
An object of the present invention is to provide a refractory excellent in erosion resistance.
【０００５】[0005]
【課題を解決するための手段】前記目的に沿う本発明に
係る耐スポーリング・耐溶損性に優れた耐火物は、耐火
原料に、最長辺が０．５〜６０ｍｍ、その曲げ強度が３
００〜５０００ｋｇ／ｃｍ2 、融点が１５００℃以上で
ある板状片を添加する。この耐火物は、所定の曲げ強度
を有する板状片を耐火原料に添加しているので、耐火物
の内部に板状片をくさび状（アンカー状）に存在させ、
耐火原料と板状片が反応した複合組成物を板状片の表面
に形成し、耐火原料の粒子間を強固に結合することがで
きる。更に、急熱・急冷の過酷な熱変化が生じた際に、
耐火物の表面に発生した亀裂を板状片でくい止め、内部
への亀裂の伝播を抑制し、スポーリングを防止すること
ができる。しかも、耐火物の稼働面に露出した板状片
は、スラグ等の浸透を抑制し、耐火原料の骨材の溶損と
脱落を防止して耐溶損性を高めることができる。According to the present invention, there is provided a refractory having excellent spalling resistance and erosion resistance according to the present invention, wherein the refractory raw material has a longest side of 0.5 to 60 mm and a bending strength of 3 to 3.
A plate-like piece having a melting point of from 1500 to 5000 kg / cm 2 and a melting point of 1500 ° C. or more is added. Since this refractory has a plate-like piece having a predetermined bending strength added to a refractory raw material, the plate-like piece is present in a wedge-like (anchor-like) inside the refractory,
A composite composition in which the refractory raw material and the plate-like piece have reacted is formed on the surface of the plate-like piece, and the particles of the refractory raw material can be strongly bonded. In addition, when severe heat changes such as rapid heating and quenching occur,
Cracks generated on the surface of the refractory are stopped by plate-like pieces, and propagation of the cracks inside can be suppressed, and spalling can be prevented. Moreover, the plate-like piece exposed on the operating surface of the refractory can suppress the penetration of slag and the like, and can prevent erosion and falling off of the aggregate of the refractory raw material, thereby improving erosion resistance.
【０００６】ここで、前記板状片は、前記耐火原料に２
〜５０重量％添加するのが好ましい。板状片を所定量添
加しているので、板状片が耐火物の内部にくさび状に多
数形成されて耐火原料の粒子間の結合をより強め、耐火
物の表面に発生した亀裂が内部に伝播するのを安定して
抑制することができる。[0006] Here, the plate-like piece is added to the refractory raw material by 2%.
It is preferable to add 50% by weight. Since a predetermined amount of plate-like pieces is added, a large number of plate-like pieces are formed in a wedge shape inside the refractory, strengthening the bonds between the particles of the refractory raw material, and cracks generated on the surface of the refractory are formed inside. Propagation can be suppressed stably.
【０００７】更に、前記板状片の厚みを０．２〜１０ｍ
ｍにすることができる。これにより、耐火原料に添加さ
れてから受熱や焼成により焼結した際に、板状片を耐火
原料中に残存させることができる。しかも、混練を容易
にして耐火物に均一に混合できる。Further, the thickness of the plate-like piece is 0.2 to 10 m.
m. This allows the plate-shaped piece to remain in the refractory raw material when it is sintered by heat reception or firing after being added to the refractory raw material. Moreover, kneading is facilitated and uniform mixing with the refractory is possible.
【０００８】また、前記板状片をセラミックスとするこ
とができる。板状片がセラミックスからなることによ
り、曲げ強度が高く、高融点の板状片にすることがで
き、耐火物の耐スポーリング及び耐溶損性をより安定し
て向上できる。Further, the plate-like piece can be made of ceramics. Since the plate-like piece is made of ceramics, the plate-like piece having a high bending strength and a high melting point can be obtained, and the spalling resistance and the erosion resistance of the refractory can be more stably improved.
【０００９】更に、前記耐火原料を不定形耐火物とする
ことも可能である。これにより、少ない水分で板状片を
均一に配合でき、流し込みや圧送充填による施工を容易
にし、耐スポーリング及び耐溶損性に優れた耐火物を得
ることができる。Further, the refractory raw material may be an irregular refractory. This makes it possible to uniformly mix the plate-shaped pieces with a small amount of water, to facilitate the casting and the filling by pressure filling, and to obtain a refractory excellent in spalling resistance and erosion resistance.
【００１０】[0010]
【発明の実施の形態】続いて、添付した図面を参照しつ
つ、本発明を具体化した実施の形態につき説明し、本発
明の理解に供する。図１は本発明の一実施の形態に係る
耐スポーリング・耐溶損性に優れた耐火物の断面の模式
図、図２は耐火物の添加板状片の曲げ強度と弾性率比を
表すグラフ、図３は板状片の添加量と熱間曲げ強度の関
係を表すグラフである。図１に示すように、本発明の一
実施の形態に係る耐スポーリング・耐溶損性に優れた耐
火物（以下耐火物という）１０は、耐火原料１１に、曲
げ強度が３００〜５０００ｋｇ／ｃｍ2 であり、その最
も長い辺が０．５〜６０ｍｍの板状片１２が添加されて
いる。この板状片１２の厚みは、０．２〜１０ｍｍであ
り、耐火原料１１に２〜５０重量％添加され、耐火原料
１１中に均一に分散している。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. FIG. 1 is a schematic view of a cross section of a refractory having excellent spalling and erosion resistance according to an embodiment of the present invention, and FIG. 2 is a graph showing the flexural strength and elastic modulus ratio of a refractory-added plate-shaped piece. FIG. 3 is a graph showing the relationship between the amount of plate-like pieces added and the hot bending strength. As shown in FIG. 1, a refractory (hereinafter referred to as a refractory) 10 having excellent spalling resistance and erosion resistance according to an embodiment of the present invention has a bending strength of 300 to 5000 kg / cm. 2 , the plate-like piece 12 having the longest side of 0.5 to 60 mm is added. The thickness of the plate-like piece 12 is 0.2 to 10 mm, and 2 to 50% by weight is added to the refractory raw material 11 and is uniformly dispersed in the refractory raw material 11.
【００１１】以下、板状片１２について詳細に説明す
る。板状片１２は、アルミナ系、マグネシア系、ムライ
ト系、アルミナ−マグネシア系等を主成分にした原料を
焼成した後に破砕機で板状に破砕したものである。特
に、板状片１２は、その融点を１５００℃以上にするこ
とにより、耐火原料１１と反応した際に、適正な厚みの
複合組成を形成させ、同時に、板状片１２の一部を残存
させることができる。その結果、板状片１２が耐火原料
１１内にくさび状に存在し、受熱した際に、その表面に
耐火原料１１と反応した複合組成物を形成し、耐火原料
１１の間の結合力を高めることができるので、耐火物１
０の強度が向上できる。板状片の融点が１５００℃より
低くなると、焼成過程や使用中の受熱により、添加した
板状片が溶融したり、耐火原料と板状片が反応して低強
度の複合組成物が形成され、極端に耐溶損性が低下して
耐火物の寿命が短くなる。従って、板状片の融点は、１
５５０℃以上にすることがより好ましい。Hereinafter, the plate-like piece 12 will be described in detail. The plate-like piece 12 is obtained by firing a raw material mainly composed of an alumina-based, magnesia-based, mullite-based, alumina-magnesia-based, or the like, and then crushing the plate-like material with a crusher. In particular, when the plate-shaped piece 12 has a melting point of 1500 ° C. or more, it reacts with the refractory raw material 11 to form a composite composition having an appropriate thickness, and at the same time, a part of the plate-shaped piece 12 remains. be able to. As a result, when the plate-shaped piece 12 exists in a wedge shape in the refractory raw material 11 and receives heat, a composite composition reacting with the refractory raw material 11 is formed on the surface thereof, and the bonding force between the refractory raw materials 11 is increased. Refractory 1
0 strength can be improved. When the melting point of the plate-shaped piece is lower than 1500 ° C., the added plate-shaped piece is melted by the firing process or the heat received during use, or the refractory raw material and the plate-shaped piece react to form a low-strength composite composition. In addition, the erosion resistance is extremely reduced, and the life of the refractory is shortened. Therefore, the melting point of the plate-like piece is 1
More preferably, the temperature is set to 550 ° C. or higher.
【００１２】更に、耐火原料１１に添加する板状片１２
の曲げ強度は、３００〜５０００ｋｇ／ｃｍ2 にする必
要がある。図２に示すように、板状片を１０重量％添加
した場合において、板状片の曲げ強度が３００ｋｇ／ｃ
ｍ2 未満では、弾性率比（１５００℃の温度で３時間加
熱後の弾性率／加熱前の弾性率）が急激に低下してスポ
ーリングが生じ易くなり、耐火物１０の寿命が低下す
る。なお、耐火物の弾性率は、一般に用いられている耐
火物の弾性限界以内における応力と歪みの比で表され
る。一方、曲げ強度が５０００ｋｇ／ｃｍ2 を超える
と、板状片が高純度、且つ高密度になり、急加熱や急冷
却によって、板状片自体がスポーリングを招いて耐火物
の寿命が低下する。しかも、高純度化する程に素材の価
格が高くなり、耐火物コストが上昇したり、破砕する際
の破砕機の損傷等を招く。この理由から、曲げ強度とし
ては、６００〜４５００ｋｇ／ｃｍ2 にすると、弾性率
比をより安定して高めることができ、耐火物の急加熱や
急冷却による耐スポーリング性を確実に向上できる。Further, the plate-like piece 12 to be added to the refractory raw material 11
Is required to have a bending strength of 300 to 5000 kg / cm 2 . As shown in FIG. 2, when 10% by weight of the plate-like piece was added, the bending strength of the plate-like piece was 300 kg / c.
If it is less than m 2 , the elastic modulus ratio (elastic modulus after heating at 1500 ° C. for 3 hours / elastic modulus before heating) sharply decreases, spalling easily occurs, and the life of the refractory 10 decreases. The elastic modulus of a refractory is represented by the ratio of stress to strain within the elastic limit of a generally used refractory. On the other hand, when the bending strength exceeds 5000 kg / cm 2 , the plate-like piece becomes high purity and high density, and the plate-like piece itself causes spalling due to rapid heating or rapid cooling, and the life of the refractory decreases. . In addition, the higher the purity, the higher the price of the material, the higher the cost of refractories, and the damage to the crusher when crushing. For this reason, when the flexural strength is set to 600 to 4500 kg / cm 2 , the elastic modulus ratio can be more stably increased, and the spalling resistance by rapid heating and rapid cooling of the refractory can be surely improved.
【００１３】更に、板状片１２の厚みを０．２〜１０ｍ
ｍとすることにより、耐火原料１１と反応して複合組成
物を生成した際に、板状片１２の一部を耐火原料１１中
にくさび状に残存させることができ、耐火原料１１の粒
子間の結合力を高めて耐火物１０の強度が向上できる。
板状片の厚みが０．２ｍｍ未満になると、耐火原料と反
応して複合組成物を生成して、残存する板状片が無くな
るので、板状片による耐火原料の粒子間の結合ができ
ず、耐火物の強度が低下する。一方、板状片の厚みが１
０ｍｍを超えると、高密度の厚い層になるために、急熱
・急冷却を受けた際に、この高密度の部位から亀裂が生
じ、結合強度が低下して耐火物の強度が低下する。ま
た、板状片の最長辺が０．５ｍｍより小さいと、耐火原
料にくさび状にすることができず、耐火原料の粒子間の
結合ができず、耐火物の強度が低下する。一方、板状片
の最長辺が６０ｍｍを超えると、耐火原料に板状片を均
一に混合することができず、板状片が高濃度となった部
位の耐火原料の粒子間の結合が極端に弱くなり、耐火物
の寿命が低下する。Further, the thickness of the plate-like piece 12 is 0.2 to 10 m.
By reacting with the refractory raw material 11, a part of the plate-like piece 12 can be left in a wedge shape in the refractory raw material 11 when the composite composition is produced by reacting with the refractory raw material 11. And the strength of the refractory 10 can be improved.
When the thickness of the plate-like piece is less than 0.2 mm, it reacts with the refractory raw material to form a composite composition, and the remaining plate-like piece disappears, so that bonding between the particles of the refractory raw material by the plate-like piece cannot be performed. , The strength of the refractory decreases. On the other hand, when the thickness of the plate-like piece is 1
When the thickness exceeds 0 mm, a high-density thick layer is formed, so that when subjected to rapid heat / cooling, cracks are generated from the high-density portion, whereby the bonding strength is reduced and the refractory strength is reduced. On the other hand, if the longest side of the plate-like piece is smaller than 0.5 mm, the refractory raw material cannot be formed into a wedge shape, the particles of the refractory raw material cannot be bonded, and the strength of the refractory decreases. On the other hand, if the longest side of the plate-like piece exceeds 60 mm, the plate-like piece cannot be uniformly mixed with the refractory raw material, and the bond between the particles of the refractory raw material at the portion where the plate-like piece has a high concentration is extremely high. And the life of the refractory decreases.
【００１４】また、板状片１２は、２〜５０重量％の範
囲で添加する。添加量が２重量％より少ないと、耐火原
料中の板状片が不足し、耐火原料の粒子間をくさび状に
結合することができず、耐火物の強度が不足し、耐火物
の表面に生成した亀裂等の内部への伝播を抑制できず、
耐スポーリング性及び耐溶損性が低下する。板状片の添
加量が５０重量％を超えると、耐火原料との複合組成物
が形成できず、結合が悪くなって強度が低下し、場合に
よっては、耐火原料中に板状片の連続した配列を招き、
この配列部の境界で剥落が生じ易くなる。しかも、混練
及び耐火物の流し込みを行う際のフロー値（流動性の指
標）が低下し、耐火物の圧送に支障が生じたり、施工時
の充填性が悪くなる。図３は板状片（曲げ強度３１００
ｋｇ／ｃｍ2 ）の添加量と１５００℃で１時間加熱した
際の熱間曲げ強度の関係を表したものであり、添加量が
２重量％から急激に上昇し、添加量が５０重量％になる
と逆に低下する。また、スラグによる溶損試験を行った
結果、耐溶損性も前記の熱間曲げ強度と同じ傾向を示し
ており、板状片１２の添加量としては、７〜３０重量％
が好適である。特に、板状片１２は、耐火原料１１と同
様にアルミナ系、マグネシア系、ムライト系、アルミナ
−マグネシア系等を主成分にした原料をドクターブレー
ド法あるいはプレス法、鋳込み法等により、所定の厚み
に成形してから１５００℃以上の温度で焼成したものを
用いる。板状片１２をセラミックス片にすることによ
り、前記の曲げ強度やくさび状の結合が安定できると共
に、稼働面のスラグや溶鉄に対する耐溶損性が向上して
より好ましい結果が得られる。The plate-like piece 12 is added in the range of 2 to 50% by weight. When the addition amount is less than 2% by weight, the plate-like pieces in the refractory raw material are insufficient, and the particles of the refractory raw material cannot be bonded in a wedge shape, the strength of the refractory is insufficient, and the surface of the refractory is insufficient. Propagation of generated cracks etc. to the inside can not be suppressed,
The spalling resistance and the erosion resistance decrease. When the addition amount of the plate-like piece exceeds 50% by weight, a composite composition with the refractory raw material cannot be formed, the bonding is deteriorated, the strength is reduced, and in some cases, the plate-like piece is continuously contained in the refractory raw material. Invite the array,
At the boundary of the arrangement portion, peeling easily occurs. In addition, the flow value (index of fluidity) at the time of kneading and pouring of the refractory is reduced, which hinders the pumping of the refractory and deteriorates the filling property during construction. FIG. 3 shows a plate-like piece (bending strength 3100).
(kg / cm 2 ) and the relationship between hot bending strength when heated at 1500 ° C. for 1 hour. The amount of addition rapidly increased from 2% by weight, and the amount of addition increased to 50% by weight. When it becomes, it decreases conversely. Further, as a result of the slag erosion test, the erosion resistance shows the same tendency as the above-mentioned hot bending strength, and the addition amount of the plate-like piece 12 is 7 to 30% by weight.
Is preferred. In particular, like the refractory raw material 11, the plate-like piece 12 is made of a raw material containing alumina, magnesia, mullite, alumina-magnesia or the like as a main component by a doctor blade method, a pressing method, a casting method, or the like to a predetermined thickness. And then fired at a temperature of 1500 ° C. or higher. By making the plate-shaped piece 12 a ceramic piece, the bending strength and the wedge-shaped connection can be stabilized, and the erosion resistance of the operating surface to slag and molten iron is improved, so that more preferable results can be obtained.
【００１５】板状片１２を添加する耐火原料１１として
の不定形耐火物としては、特に限定するものでなく、ア
ルミナ系、マグネシア系、ジルコニア、炭素質、シリカ
系、あるいは前記材質の二種以上を配合したもの等の一
般に用いられている原料を使用することができる。この
耐火原料１１に添加するバインダーは、セメント、フェ
ノール等の有機樹脂等のバインダーを添加したり、Ａｌ
やＳｉ等の金属を添加できる。The amorphous refractory as the refractory raw material 11 to which the plate-like piece 12 is added is not particularly limited, and may be alumina-based, magnesia-based, zirconia, carbonaceous, silica-based, or two or more of the above materials. A commonly used raw material such as a mixture of the above can be used. As a binder to be added to the refractory raw material 11, a binder such as an organic resin such as cement or phenol is added,
And metals such as Si.
【００１６】耐火物１０を製造するには、このような耐
火原料１１に、板状片１２を添加してから混練機に装入
し、水を５〜７重量％、バインダーの一例であるセメン
ト粉を０．２〜８重量％を添加し、２〜１０分間の混練
を行う。混練の際に、板状片１２は、耐火原料１１中に
分散し、それぞれの板状片１２が異方性（向く方向が異
なる）を持ち、しかも、くさび状で存在し、耐火原料１
１を強固に結合することができる。そして、図示しない
精錬炉の稼働面に型枠を設け、稼働面と型枠の隙間に流
し込みを行ったり、ブロックに成形した後に焼成するこ
とにより煉瓦として用いることができる。In order to manufacture the refractory material 10, a plate-like piece 12 is added to such a refractory raw material 11, which is then charged into a kneading machine. The powder is added in an amount of 0.2 to 8% by weight and kneaded for 2 to 10 minutes. At the time of kneading, the plate-like pieces 12 are dispersed in the refractory raw material 11, and each plate-like piece 12 has anisotropy (different direction) and is present in a wedge shape.
1 can be firmly bonded. Then, a mold can be provided on an operating surface of a smelting furnace (not shown) and poured into a gap between the operating surface and the mold, or formed into a block and fired to be used as a brick.
【００１７】[0017]
【実施例】Ａｌ2 Ｏ3 を９０重量％含有したＡｌ2 Ｏ3
系の耐火原料に、Ａｌ2 Ｏ3 を９５重量％含有したセラ
ミックスからなる板状片をその曲げ強度、添加量、最長
辺長さを変化させて添加し、バインダーとしてセメント
を５重量％添加してから混練して形枠に流し込んだ後、
１５００℃に加熱した際の従来の耐火物の指数を１とし
た場合の弾性率比や溶損指数、総合評価等について調査
した。その結果を表１に示す。実施例１は、Ａｌ2 Ｏ3
系の耐火原料に、曲げ強度が３００ｋｇ／ｃｍ2 のセラ
ミックスの板状片を１０重量％添加し、その時の板状片
の最長辺長さを１０ｍｍにした場合であり、弾性率比が
１．０６と良く、溶損指数も０．９８と良好であり、総
合評価としては良い結果（○）が得られた。実施例２
は、Ａｌ2 Ｏ3 系の耐火原料に、曲げ強度が１５００ｋ
ｇ／ｃｍ2 のセラミックスの板状片を５重量％添加し、
その時の板状片の最長辺長さを３０ｍｍにした場合であ
り、弾性率比が１．１９と良く、溶損指数も０．９０と
良好であり、総合評価としては優れた結果（◎）が得ら
れた。実施例３は、Ａｌ2 Ｏ3 系の耐火原料に、曲げ強
度が３１００ｋｇ／ｃｍ2 のセラミックスの板状片を２
０重量％添加し、その時の板状片の最長辺長さを３０ｍ
ｍにした場合であり、弾性率比が１．４４と良く、溶損
指数も０．８０と良好であり、総合評価としては優れた
結果（◎）が得られた。実施例４及び実施例５は、それ
ぞれ曲げ強度を３５００、４０００ｋｇ／ｃｍ2、板状
片の添加量を５０、１０重量％にし、その時の板状片の
最長辺長さを４０、５０ｍｍにした場合であり、弾性率
比がいずれも１．１２と良く、溶損指数も０．９２、
０．８０と良好であり、総合評価として、実施例４は良
い結果（○）、実施例５は優れた結果（◎）であった。EXAMPLES Al 2 O 3 containing 90% by weight of Al 2 O 3
A plate-like piece made of ceramics containing 95% by weight of Al 2 O 3 was added to the refractory raw material of the system while changing the bending strength, the amount added and the length of the longest side, and 5% by weight of cement was added as a binder. After kneading and pouring into the formwork,
The elasticity ratio, the erosion index, the overall evaluation, and the like were investigated when the index of the conventional refractory when heated to 1500 ° C. was set to 1. Table 1 shows the results. Example 1 shows that Al 2 O 3
10% by weight of a plate-like piece of ceramics having a bending strength of 300 kg / cm 2 was added to the refractory raw material of the system, and the length of the longest side of the plate-like piece at that time was 10 mm, and the elastic modulus ratio was 1. 06 was good, and the erosion index was 0.98, which was good, and a good result (O) was obtained as a comprehensive evaluation. Example 2
Is an Al 2 O 3 refractory raw material with a bending strength of 1500 k
g / cm 2 of 5% by weight of a ceramic plate
In this case, the longest side length of the plate-like piece was 30 mm, the elastic modulus ratio was good at 1.19, the erosion index was good at 0.90, and the result was excellent as a comprehensive evaluation (（). was gotten. In Example 3, a plate-like piece of ceramic having a bending strength of 3100 kg / cm 2 was added to an Al 2 O 3 refractory raw material.
0% by weight, and the longest side length of the plate-shaped piece at that time is 30 m
m, the elastic modulus ratio was good at 1.44, the erosion index was good at 0.80, and an excellent result (◎) was obtained as a comprehensive evaluation. In Example 4 and Example 5, the bending strength was 3500 and 4000 kg / cm 2 , respectively, the addition amount of the plate-like piece was 50 and 10% by weight, and the longest side length of the plate-like piece at that time was 40 and 50 mm. In both cases, the elastic modulus ratio is preferably 1.12, the erosion index is 0.92,
As a comprehensive evaluation, the result of Example 4 was good (４), and the result of Example 5 was excellent (◎).
【００１８】[0018]
【表１】 [Table 1]
【００１９】また、曲げ強度を３１００ｋｇ／ｃｍ2 、
添加量が１０又は２０重量％、最長辺が４０又は２０ｍ
ｍのセラミックスの板状片の厚みを変化させた場合につ
いて、弾性率比、溶損指数、総合評価等について調査し
た。その結果を表２に示す。実施例６、７では、板状片
の厚みをそれぞれ２ｍｍ、１ｍｍにした場合であり、弾
性率比が１．２４、１．３６、溶損指数が０．８１、
０．７５となり、総合評価としてはどちらも優れた結果
（◎）が得られた。実施例８、９では、板状片の厚みを
それぞれ５ｍｍ、０．５０ｍｍにした場合であり、弾性
率比が１．０９、１．１８、溶損指数が０．９２、０．
８５となり、総合評価としてはどちらも良い結果（○）
が得られた。The bending strength is 3100 kg / cm 2 ,
Addition amount is 10 or 20% by weight, longest side is 40 or 20m
When the thickness of the m-shaped ceramic plate was changed, the elastic modulus ratio, the erosion index, the overall evaluation, and the like were investigated. Table 2 shows the results. In Examples 6 and 7, the thicknesses of the plate-shaped pieces were 2 mm and 1 mm, respectively. The elastic modulus ratio was 1.24, 1.36, the erosion index was 0.81,
It was 0.75, and both were excellent results (◎) as the overall evaluation. In Examples 8 and 9, the thicknesses of the plate-shaped pieces were set to 5 mm and 0.50 mm, respectively. The elastic modulus ratio was 1.09, 1.18, the erosion index was 0.92, and the erosion index was 0.90.
85, both of which are good results for the overall evaluation (○)
was gotten.
【００２０】[0020]
【表２】 [Table 2]
【００２１】これに対して、比較例１では、Ａｌ2 Ｏ3
系の耐火原料に曲げ強度を２００ｋｇ／ｃｍ2 のセラミ
ックスの板状片を５重量％添加し、その時の板状片の最
長辺長さを６０ｍｍ、厚みを２ｍｍにした場合であり、
弾性率比が０．９１と悪く、溶損指数も１．１２とな
り、総合評価としては悪い結果（×）となった。比較例
２は、Ａｌ2 Ｏ3 系の耐火原料に曲げ強度を２００ｋｇ
／ｃｍ2 のセラミックの板状片を６０重量％添加し、そ
の時の板状片の最長辺長さを１０ｍｍ、厚みを２ｍｍに
した場合であり、弾性率比が０．７３と悪く、溶損指数
も１．０８となり、総合評価としては悪い結果（×）と
なった。On the other hand, in Comparative Example 1, Al 2 O 3
5% by weight of a plate-shaped piece of ceramic having a bending strength of 200 kg / cm 2 was added to the refractory raw material of the system, and the longest side length of the plate-shaped piece at that time was 60 mm, and the thickness was 2 mm.
The elastic modulus ratio was as bad as 0.91, and the erosion index was also as 1.12, which was a bad result (x) as the overall evaluation. In Comparative Example 2, the bending strength was 200 kg for the Al 2 O 3 refractory raw material.
/ Cm 2 of a ceramic plate having a weight of 60% by weight and the longest side of the plate at that time having a length of 10 mm and a thickness of 2 mm. The index was also 1.08, which was a bad result (x) for the overall evaluation.
【００２２】[0022]
【表３】 [Table 3]
【００２３】以上、本発明の実施の形態を説明したが、
本発明は、上記した形態に限定されるものでなく、要旨
を逸脱しない条件の変更等は全て本発明の適用範囲であ
る。例えば、板状片としては、厚みに比べて、最も長い
辺（最長辺）が大きいものであれば、煉瓦等の破砕した
ものを篩分けしたものを用いることもできる。更に、板
状片の原料としては、耐火物に一般に用いられている無
機素材であれば良く、単体あるいは組み合わせて用い、
板状片に加工した際に所定の曲げ強度及び融点を有する
ものであれば良い。The embodiment of the present invention has been described above.
The present invention is not limited to the above-described embodiment, and all changes in conditions that do not depart from the gist are within the scope of the present invention. For example, if the longest side (longest side) is larger than the thickness of the plate-like piece, a piece obtained by sieving a crushed brick or the like can be used. Further, the raw material of the plate-shaped piece may be any inorganic material generally used for refractories, and may be used alone or in combination.
Any material having a predetermined bending strength and a predetermined melting point when processed into a plate-like piece may be used.
【００２４】[0024]
【発明の効果】請求項１〜５記載の耐スポーリング・耐
溶損性に優れた耐火物は、耐火原料に、最長辺が０．５
〜６０ｍｍ、その曲げ強度が３００〜５０００ｋｇ／ｃ
ｍ2 を有し、融点が１５００℃以上である板状片を添加
しているので、耐火原料どうしをくさび状になった板状
片により強固に結合し、急熱・急冷の過酷な熱変化に対
してスポーリングを防止し、耐火物の稼働面に露出した
板状片によりスラグ等の浸透を抑制して、耐火原料の骨
材の溶損と脱落を防止し、耐溶損性を高めることがで
き、耐火物の寿命を延長することができる。そして、こ
の耐火物を用いた精錬炉や二次精錬炉等の炉寿命を延長
でき、生産性の向上や耐火物コストの低減、補修の手間
等の減少を図ることができる。The refractory excellent in spalling resistance and erosion resistance according to claims 1 to 5 is characterized in that the refractory raw material has a longest side of 0.5.
~ 60mm, its bending strength is 300 ~ 5000kg / c
has m 2, since the melting point is added to the plate-shaped pieces is 1500 ° C. or higher, and strongly bonded by a plate-like piece becomes a refractory raw material each other in a wedge shape, severe thermal variation of the rapid heating-rapid cooling To prevent spalling, prevent the penetration of slag, etc. by plate-like pieces exposed on the refractory's operating surface, prevent erosion and falling off of aggregates of refractory raw materials, and enhance erosion resistance And the life of the refractory can be extended. The life of a refining furnace or a secondary smelting furnace using the refractory can be extended, the productivity can be improved, the cost of the refractory can be reduced, and the time and effort for repair can be reduced.
【００２５】特に、請求項２記載の耐スポーリング・耐
溶損性に優れた耐火物は、板状片を耐火原料に２〜５０
重量％配合しているので、耐火原料の粒子間の結合を強
め、耐火物の表面に発生した亀裂が内部に伝播するのを
抑制して耐スポーリング性や耐溶損性をより高め、耐火
物の寿命を延長することができる。In particular, the refractory excellent in spalling resistance and erosion resistance according to claim 2 is characterized in that a plate-like piece is used as a refractory raw material in an amount of 2 to 50%.
By weight, the bonding between the particles of the refractory material is strengthened, cracks generated on the surface of the refractory are suppressed from propagating inside, and the spalling resistance and the erosion resistance are further improved. Life can be extended.
【００２６】請求項３記載の耐スポーリング・耐溶損性
に優れた耐火物は、板状片を０．２〜１０ｍｍの厚みに
しているので、混練を容易にして耐火物を均一な組成に
でき、耐火原料をくさび状の板状片によって結合し、耐
火物の強度を強くして耐スポーリング及び耐溶損を向上
し、寿命をより安定して延長することができる。The refractory having excellent spalling resistance and erosion resistance according to claim 3 has a plate-like piece having a thickness of 0.2 to 10 mm, so that kneading is facilitated and the refractory has a uniform composition. In this case, the refractory raw materials are bonded by wedge-shaped plate-like pieces, the strength of the refractory is increased, the spalling resistance and the erosion resistance are improved, and the life can be more stably extended.
【００２７】請求項４記載の耐スポーリング・耐溶損性
に優れた耐火物は、板状片をセラミックスにしているの
で、曲げ強度が高く、しかも、高融点の板状片にするこ
とができ、耐火物の耐スポーリング及び耐溶損性を確実
に向上できる。In the refractory having excellent spalling resistance and erosion resistance according to the fourth aspect, since the plate-like piece is made of ceramics, the plate-like piece having high bending strength and high melting point can be obtained. In addition, the spalling resistance and the erosion resistance of the refractory can be reliably improved.
【００２８】請求項５記載の耐スポーリング・耐溶損性
に優れた耐火物は、耐火原料に不定形耐火物を用いるの
で、少ない水分で混練し、板状片を均一に配合でき、流
し込みや圧送充填等の施工を容易に行うことができ、耐
火物のコスト等を低減することができる。The refractory having excellent spalling resistance and erosion resistance according to the fifth aspect uses an amorphous refractory as a refractory raw material, so that it can be kneaded with a small amount of moisture, and can uniformly mix plate-like pieces. Construction such as pressure filling can be easily performed, and the cost and the like of the refractory can be reduced.
【図１】本発明の一実施の形態に係る耐スポーリング・
耐溶損性に優れた耐火物の断面の模式図である。FIG. 1 is a diagram illustrating an embodiment of the present invention.
It is a schematic diagram of a section of a refractory excellent in erosion resistance.
【図２】耐火物の添加板状片の曲げ強度と弾性率比を表
すグラフである。FIG. 2 is a graph showing the flexural strength and elastic modulus ratio of a refractory-added plate-shaped piece.
【図３】板状片の添加量と熱間曲げ強度の関係を表すグ
ラフである。FIG. 3 is a graph showing the relationship between the amount of plate-like pieces added and the hot bending strength.
【符号の説明】 １０：耐火物、１１：耐火原料、１２：板状片[Description of Signs] 10: Refractory, 11: Refractory raw material, 12: Plate-shaped piece
───────────────────────────────────────────────────── フロントページの続き (72)発明者 岡本 吉平栄 福岡県北九州市戸畑区飛幡町１番１号 新 日本製鐵株式会社八幡製鐵所内 Ｆターム(参考） 4G033 AA01 AB01 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshihira Sakae Okamoto 1-1-1 Tobata-cho, Tobata-ku, Kitakyushu-shi, Fukuoka F-term in Nippon Steel Corporation Yawata Works (reference) 4G033 AA01 AB01
Claims (5)
ｍ、その曲げ強度が３００〜５０００ｋｇ／ｃｍ2 、融
点が１５００℃以上である板状片を添加したことを特徴
とする耐スポーリング・耐溶損性に優れた耐火物。1. The refractory raw material has a longest side of 0.5 to 60 m.
m, a refractory excellent in spalling resistance and erosion resistance characterized by adding a plate-like piece having a bending strength of 300 to 5000 kg / cm 2 and a melting point of 1500 ° C. or more.
性に優れた耐火物において、前記板状片を前記耐火原料
に２〜５０重量％添加していることを特徴とする耐スポ
ーリング性・耐溶損性に優れた耐火物。2. The refractory having excellent spalling resistance and erosion resistance according to claim 1, wherein 2 to 50% by weight of the plate-like piece is added to the refractory raw material. Refractory with excellent resistance and erosion resistance.
耐溶損性に優れた耐火物において、前記板状片の厚みが
０．２〜１０ｍｍであることを特徴とする耐スポーリン
グ性・耐溶損性に優れた耐火物。3. The anti-sporing method according to claim 1, wherein
A refractory having excellent spalling resistance and erosion resistance, wherein the thickness of the plate-like piece is 0.2 to 10 mm.
スポーリング・耐溶損性に優れた耐火物において、前記
板状片がセラミックスからなることを特徴とする耐スポ
ーリング・耐溶損性に優れた耐火物。4. The refractory having excellent spalling resistance and erosion resistance according to claim 1, wherein the plate-like piece is made of ceramics. Refractory with excellent damageability.
スポーリング・耐溶損性に優れた耐火物において、前記
耐火原料が不定形耐火物であることを特徴とする耐スポ
ーリング性・耐溶損性に優れた耐火物。5. The refractory excellent in spalling resistance and erosion resistance according to claim 1, wherein said refractory raw material is an irregular refractory. Refractory with excellent resistance and erosion resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11165599A JP2000351678A (en) | 1999-06-11 | 1999-06-11 | Refractory material with excellent spalling resistance and erosion resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11165599A JP2000351678A (en) | 1999-06-11 | 1999-06-11 | Refractory material with excellent spalling resistance and erosion resistance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000351678A true JP2000351678A (en) | 2000-12-19 |
Family
ID=15815422
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11165599A Pending JP2000351678A (en) | 1999-06-11 | 1999-06-11 | Refractory material with excellent spalling resistance and erosion resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000351678A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020536029A (en) * | 2017-10-04 | 2020-12-10 | リフラクトリー・インテレクチュアル・プロパティー・ゲー・エム・ベー・ハー・ウント・コ・カーゲー | Batches for manufacturing refractory products, manufacturing methods for refractory products, usage of refractory products and synthetic raw materials |
-
1999
- 1999-06-11 JP JP11165599A patent/JP2000351678A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020536029A (en) * | 2017-10-04 | 2020-12-10 | リフラクトリー・インテレクチュアル・プロパティー・ゲー・エム・ベー・ハー・ウント・コ・カーゲー | Batches for manufacturing refractory products, manufacturing methods for refractory products, usage of refractory products and synthetic raw materials |
| US11407685B2 (en) | 2017-10-04 | 2022-08-09 | Refractory Intellectual Property Gmbh & Co. Kg | Batch for producing a refractory product, method for producing a refractory product, a refractory product and the use of a synthetic raw material |
| JP7171704B2 (en) | 2017-10-04 | 2022-11-15 | リフラクトリー・インテレクチュアル・プロパティー・ゲー・エム・ベー・ハー・ウント・コ・カーゲー | Batches for making refractory products, methods of making refractory products, uses of refractory products and synthetic raw materials |
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