JP2000065484A - Method for repairing molten metal transfer trough - Google Patents

Method for repairing molten metal transfer trough

Info

Publication number
JP2000065484A
JP2000065484A JP10235492A JP23549298A JP2000065484A JP 2000065484 A JP2000065484 A JP 2000065484A JP 10235492 A JP10235492 A JP 10235492A JP 23549298 A JP23549298 A JP 23549298A JP 2000065484 A JP2000065484 A JP 2000065484A
Authority
JP
Japan
Prior art keywords
refractory
source
repairing
cao
spraying
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.)
Withdrawn
Application number
JP10235492A
Other languages
Japanese (ja)
Inventor
Keiichiro Isomura
敬一郎 磯村
Shigeaki Goto
滋明 後藤
Makoto Nomura
真 野村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Steel Corp
Original Assignee
Kawasaki Steel Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kawasaki Steel Corp filed Critical Kawasaki Steel Corp
Priority to JP10235492A priority Critical patent/JP2000065484A/en
Publication of JP2000065484A publication Critical patent/JP2000065484A/en
Withdrawn legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To provide a method for repairing a molten metal transfer trough for improving adhesive properties of repairing monolithic refractory with a base material of a repairing position as compared with prior art. SOLUTION: In the method for repairing a molten metal transfer trough to be repaired comprising the steps of spraying a monolithic refractory to an eroded surface of the refractory lined in the trough for transferring molten metal with slag, adhering a slurry containing a mixture of a CaO source of a composition for generating Gehlenite, an Al2O3 source and an SiO2 source as remained in the state that the slag is adhered to the eroded surface of the lined refractory, and spraying the refractory thereon.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、溶銑移送樋の補修
方法に係わり、特に高炉出銑樋の内張り耐火物の表面に
不定形耐火物を吹き付けて補修する技術に関するもので
ある。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for repairing a hot metal transfer gutter and, more particularly, to a technique for repairing a blast furnace tapping gutter by spraying an irregular refractory on the surface of the refractory lining.

【0002】[0002]

【従来の技術】近年、高炉の主樋(出銑樋のうちの出銑
口からスキンマまでの部分)の内張りには、不定形耐火
物の使用が定着している。そして、該主樋に内張りする
不定形耐火物の種類の変遷を経て、現在は、そのスラグ
・ライン(溶銑上に浮遊するスラグと接触する部位)に
相当する位置には、SiC−Al23 系不定形耐火物
が、メタル・ライン(溶銑と接触する部位)に相当する
位置には、Al23 −SiC系、あるいはAl23
−スピネル−SiC系不定形耐火物が、所謂「流し込
み」で施工」されている。ここで、「流し込み」とは、
鋳造の鋳型に相当する枠の中に、不定形耐火物を流し込
み、乾燥後に該枠を除去する不定形耐火物の施工方法で
あり、施工体の質は良好であるが、作業性が低く、コス
トがかかる。
2. Description of the Related Art In recent years, the use of irregular-shaped refractories has been established in the lining of a main gutter of a blast furnace (a portion from a tap hole to a skin in a tapping gutter). After the transition of the type of the amorphous refractory lining the main gutter, SiC-Al 2 O is now located at a position corresponding to the slag line (a portion in contact with the slag floating on the hot metal). The position where the 3 type amorphous refractory corresponds to the metal line (the portion in contact with the hot metal) is an Al 2 O 3 —SiC type or Al 2 O 3
-A spinel-SiC amorphous refractory is constructed by so-called "pour-in". Here, "pour"
In the frame corresponding to the casting mold, cast an irregular refractory, is a method of applying the irregular refractory to remove the frame after drying, the quality of the construction body is good, but workability is low, costly.

【0003】ところで、この1度施工した内張り耐火物
を長期間使用し、移送溶銑量を稼ぐため、再施工するま
での間に、該内張り耐火物の溶損面に乾式あるいは湿式
で不定形耐火物を吹き付けて継ぎ足し、補修することが
行なわれるようになった。特に、最近では、この吹き付
け補修に用いる不定形耐火物(以下、補修材ということ
あり)の耐用性をも向上させるため、建造物のコンクリ
ート吹き付け施工技術を応用して、前記「流し込み」施
工に用いる不定形耐火物(以下、流し込み材という)に
近い、比較的低水分の不定形耐火物をプランジャ・ポン
プで吐出させ、ノズルの先端で急結材(固化を早める作
用をする物質)と混合し、高圧の空気で吹き付け施工す
る新しい湿式吹き付け補修方法が採用されつつある。
By the way, in order to use the refractory lining once applied for a long period of time and to increase the amount of hot metal to be transferred, a dry or wet type refractory surface is formed on the eroded surface of the lining refractory before re-construction. Spraying and refurbishment has been carried out. In particular, recently, in order to improve the durability of irregular-shaped refractories used for this spray repair (hereinafter sometimes referred to as repair materials), applying the technology of spraying concrete on buildings, Use a plunger pump to discharge a relatively low-moisture amorphous refractory, which is similar to the refractory used (hereinafter referred to as a casting material), and mix it with a quick-setting material (a substance that hastens the solidification) at the tip of the nozzle. However, a new wet spray repair method of spraying with high-pressure air is being adopted.

【0004】上記の新補修技術は、従来の吹き付け補修
方法に比べて粉塵の発生がないうえに、施工体が緻密で
あることから、該施工体自体の耐用性を、従来の倍以上
に延長させた。しかしながら、吹き付け施工体の寿命
は、実際には溶損よりも母材(最初に内張りした不定形
耐火物、例えばSiC−Al23 系等)との接着性が
影響し、この緻密化の効果を低減させてしまう。この接
着性は、該母材の凹みが大きい、あるいは狭い部分で
は、そこに補修材の粗粒が入りにくくて密着性が悪くな
ることや、母材に付着しているスラグ層との焼結性が低
いこと等で低下するとされている。特に、後者のスラグ
層との焼結性が低い問題は、吹き付け補修に用いる不定
形耐火物の微粉Al23 とスラグとの焼結性が低いか
らであると言われている。また、このスラグ層を補修前
に除去することも考えられるが、補修作業の負荷を極め
て大きくするばかりでなく、前記母材に亀裂を生じさせ
るので、現実的ではない。さらに、吹き付け補修による
施工体と母材との接着性を改善するため、現在多くの試
みが開示されており、例えば、特開昭60−17690
号公報は、無機質バインダーとして珪酸塩やリン酸塩を
補修面に塗布することを開示している。かかる物質を補
修面に付着させると、確かに低温域で液相が生成するの
で、補修に用いる不定形耐火物と母材との接着性は向上
する。しかしながら、それら物質は融点が低いので、樋
の使用中(具体的には、出銑中)に軟化溶融して、補修
用耐火物と母材とが剥離してしまうという問題があっ
た。
[0004] The above-mentioned new repair technique does not generate dust as compared with the conventional spray repair method, and since the construction body is dense, the durability of the construction body itself is more than doubled compared to the conventional technique. I let it. However, the life of the spraying installation body is actually (monolithic refractories lined in the first, for example, SiC-Al 2 O 3 system, etc.) the base metal than erosion affects the adhesion between, the densification The effect is reduced. The adhesiveness is such that in the part where the dent of the base material is large or narrow, coarse particles of the repair material are difficult to enter there, resulting in poor adhesion and sintering with the slag layer adhering to the base material. It is said that it will decrease due to poor properties. In particular, it is said that the latter problem of low sinterability with the slag layer is due to low sinterability between the fine refractory powder Al 2 O 3 used for spray repair and the slag. It is also conceivable to remove this slag layer before repairing, but this is not practical because it not only greatly increases the load of repairing work but also causes cracks in the base material. Further, many attempts have been disclosed at present to improve the adhesiveness between the construction body and the base material by spray repair, for example, Japanese Patent Application Laid-Open No. 60-17690.
Japanese Patent Application Laid-Open Publication No. H11-163873 discloses applying a silicate or a phosphate as an inorganic binder to a repair surface. When such a substance is adhered to the repaired surface, a liquid phase is certainly generated in a low temperature range, so that the adhesiveness between the irregular refractory used for the repair and the base material is improved. However, since these substances have a low melting point, there is a problem that the refractory for repair and the base material are separated by softening and melting during use of the gutter (specifically, during tapping).

【0005】以上述べたように、湿式吹き付け補修方法
の改善で緻密な施工体を形成させることが可能となった
が、母材との接着性に問題があり、所望の耐用性を達成
できないのが現状である。
[0005] As described above, it is possible to form a dense construction body by improving the wet spraying repair method, but there is a problem in the adhesiveness to the base material, and the desired durability cannot be achieved. Is the current situation.

【0006】[0006]

【発明が解決しようとする課題】本発明は、かかる事情
に鑑み、補修用の不定形耐火物と補修個所の母材との接
着性を従来より向上可能な溶銑移送樋の補修方法を提供
することを目的としている。
SUMMARY OF THE INVENTION In view of the above circumstances, the present invention provides a method for repairing a hot metal transfer gutter capable of improving the adhesiveness between a repairable refractory and a base material of a repair location compared to the prior art. It is intended to be.

【0007】[0007]

【課題を解決するための手段】発明者は、上記目的を達
成するため、溶銑樋内張り耐火物の吹き付け補修におい
て、(1)母材、つまり補修面の凹凸が激しくとも、空
隙部の形成を避ける、(2)母材との接着性を高めて、
且つ接着層の融点を極力高めることに着眼し、鋭意研究
を重ねた。
Means for Solving the Problems To achieve the above object, the inventor of the present invention has found that, in spray repair of a refractory lining a hot metal gutter, (1) formation of voids even when the base material, that is, the repair surface is severely uneven. Avoid, (2) increase the adhesion to the base material,
In addition, they focused on raising the melting point of the adhesive layer as much as possible, and conducted intensive research.

【0008】その結果、(2)の接着性向上には、母材
補修面に付着したスラグとほぼ同様の鉱物相を生成せし
めるように、Al23 源、CaO源、SiO2 源から
なる混合物を使用すること、(1)の補修面の凹凸に無
関係に、母材と施工体との密着性を上げるには、前記混
合物の粒度を小さくして、スラリーで塗布するのが良い
ことを知り、これら知見を本発明に具現化した。
As a result, in order to improve the adhesiveness of (2), an Al 2 O 3 source, a CaO source, and a SiO 2 source are formed so as to generate a mineral phase substantially similar to the slag attached to the repaired surface of the base material. Regarding the use of the mixture, regardless of the unevenness of the repair surface in (1), in order to increase the adhesion between the base material and the construction body, it is preferable to reduce the particle size of the mixture and apply the slurry. Knowing this, these findings were embodied in the present invention.

【0009】すなわち、本発明は、スラグを伴う溶銑を
移送する樋に内張りした耐火物の溶損面に、不定形耐火
物を吹き付け、補修する溶銑移送樋の補修方法におい
て、前記内張りした耐火物の溶損面に、スラグが付着し
た状態のままで、ゲーレナイト(Gehlenite;Ca2Al2Si2O7
)が生成可能な組成のCaO源、Al23 源、SiO
2 源からなる混合物を含有するスラリーを付着せしめ、
その上に前記不定形耐火物を吹き付けることを特徴とす
る溶銑移送樋の補修方法である。
That is, the present invention relates to a method for repairing a hot metal transfer gutter for repairing a molten iron transfer gutter by spraying an amorphous refractory onto a eroded surface of a refractory lined to a gutter for transferring hot metal with slag. Gehlenite (Gehlenite; Ca 2 Al 2 Si 2 O 7
) Can be produced, a CaO source, an Al 2 O 3 source, SiO
A slurry containing a mixture of two sources is applied,
A method for repairing a hot metal transfer gutter, wherein the irregular shaped refractory is sprayed thereon.

【0010】また、本発明は、前記CaO源、Al2
3 源、SiO2 源が、いずれも平均粒径1mm以下であ
って、CaO/Al23 /SiO2 のモル比率が40
〜60/20〜30/20〜30であることを特徴とす
る溶銑移送樋の補修方法でもある。
[0010] The present invention also relates to the CaO source, Al 2 O
Each of the three sources and the SiO 2 source has an average particle size of 1 mm or less, and the molar ratio of CaO / Al 2 O 3 / SiO 2 is 40.
6060 / 20〜30 / 20〜30.

【0011】[0011]

【発明の実施の形態】以下、発明をなすに至った経緯も
まじえ、本発明の実施の形態を説明する。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below, taking into account the circumstances leading to the invention.

【0012】まず、発明者は、母材表面に付着した高炉
スラグと従来より吹き付けに使用していた不定形耐火物
との焼結性が低いことに着眼し、それらの間に単なるバ
インダーではなく、積極的に厚みのある接着層を設ける
ことを発想した。そして、該接着層を形成させる材料の
選定に鋭意努力し、高炉スラグ及び吹き付けされる不定
形耐火物の双方と焼結し易く、且つ軟化溶融温度が従来
より高いという観点から、高炉スラグの主鉱物組成物で
あるゲーレナイトが極めて有効であることを見出した。
つまり、該ゲーレナイトは、高炉スラグを構成する主鉱
物であり、1200℃以上で強固に焼結し、且つ融点が
約1380℃であるため、低温で軟化することがないか
らである。
First, the inventor has noticed that the sintering property between the blast furnace slag adhered to the base material surface and the amorphous refractory which has been conventionally used for spraying is low, and not a mere binder between them. The idea was to actively provide a thick adhesive layer. In addition, the blast furnace slag is mainly made from the viewpoint that it is easy to sinter with both the blast furnace slag and the sprayed amorphous refractory and that the softening and melting temperature is higher than before, and that the blast furnace slag is hardly selected. It has been found that gehlenite, a mineral composition, is extremely effective.
That is, the gehlenite is a main mineral constituting the blast furnace slag, is strongly sintered at 1200 ° C. or higher, and has a melting point of about 1380 ° C., so that it does not soften at low temperatures.

【0013】そこで、発明者は、母材(溶損面)に不定
形耐火物を吹き付ける前に、このゲーレナイトが多量に
形成される物質をCaO源,Al23 源、SiO2
からなる混合物で準備し、それを母材面に適切な厚みで
塗布してから、その上に補修材の不定形耐火物を吹き付
け、補修するようにしたのである。このようにすれば、
主樋に溶銑を流した際に、その熱で該混合物は加熱さ
れ、ゲーレナイトを含む接着層になり、母材やそれに付
着したスラグとその後に吹き付ける補修用の不定形耐火
物との間の接着が強固になるからである。
Therefore, the inventor of the present invention, before spraying an amorphous refractory onto a base material (melted surface), comprises a substance in which a large amount of gehlenite is formed from a CaO source, an Al 2 O 3 source, and a SiO 2 source. The mixture was prepared, applied to the base material surface at an appropriate thickness, and then sprayed with a refractory irregular-shaped refractory to repair the material. If you do this,
When the molten iron flows into the main gutter, the mixture is heated by the heat, forming an adhesive layer containing gehlenite, and bonding between the base material and the slag attached to it and the irregular shaped refractory for repair that is subsequently sprayed. Is strengthened.

【0014】本発明を実際に実施するに際しては、ゲー
レナイトが形成した粒子同士を互いに強固に焼結せしめ
る必要がある。そのためには、前記接着層で、ゲーレナ
イトができるだけ多く生成することが好ましい。この観
点から、本発明では前記の混合物のCaO、Al2
3 、SiO2 の量比を、モル比率で40〜60/20〜
30/20〜30の範囲とするのが好ましいとした。な
お、ゲーレナイト以外に生成するCaO−SiO2 系や
CaO−Al23 系、Al23 −SiO2 系鉱物
は、いずれも融点が14000℃以上で、単独では、高
炉スラグとの焼結はせず、特に弊害となるものではな
い。
In practicing the present invention, it is necessary to strongly sinter the particles formed by gehlenite with each other. To this end, it is preferable that as much gehlenite as possible is generated in the adhesive layer. From this viewpoint, in the present invention, CaO, Al 2 O
3 , the molar ratio of SiO 2 is 40-60 / 20-
It is preferable to set the range of 30/20 to 30. Incidentally, CaO-SiO 2 system and CaO-Al 2 O 3 system to produce in addition Gehlenite, Al 2 O 3 -SiO 2 based mineral is a both a melting point of 14000 ° C. or higher, alone, sintering and blast furnace slag No, it is not particularly harmful.

【0015】また、吹き付け補修に用いる不定形耐火物
と前記接着層との焼結については、「従来の技術」項で
述べたように、不定形耐火物に含まれるAl23 微粉
と接着層との焼結性が低いので、それを強固にする必要
がある。本発明では、前記の接着層を形成するための混
合物の組成を前記モル比率にすることで、Al23
士の焼結によるコランダムやCaO−Al23 系(1
2CaO−7Al23 )等の化合物も生成するので、
それらの焼結を起こさせることで、Al23と接着層
間の焼結性を改良している。
Further, for the sintering and the monolithic refractory to be used for spraying repair the adhesive layer, as described in the "Background of the Invention" section, bonded to the Al 2 O 3 fine powder contained in the monolithic refractories Since the sinterability with the layer is low, it is necessary to strengthen it. In the present invention, said the composition of the mixture for forming the adhesive layer by the molar ratio, Al 2 O 3 corundum and CaO-Al 2 O 3 system by sintering between (1
2CaO-7Al 2 O 3 ).
By causing such sintering, the sinterability between Al 2 O 3 and the adhesive layer is improved.

【0016】さらに、本発明に使用する混合物として
は、焼結開始前に、つまり樋に溶銑を流すまでに結果的
にCaO、Al23 、SiO2 となるものであれば良
い。具体的には、Ca,Al,Siを含有する炭酸化合
物や水和物が使用される。また、Al23 源やSiO
2 源としては、ゾル状のものを使用でも良い。
Further, the mixture used in the present invention may be any as long as it results in CaO, Al 2 O 3 and SiO 2 before the start of sintering, that is, before the molten iron flows into the gutter. Specifically, carbonate compounds and hydrates containing Ca, Al, and Si are used. Also, an Al 2 O 3 source or SiO 2
A sol may be used as the two sources.

【0017】加えて、これらCaO源、Al23 源、
SiO2 源のいずれも、その粒度が平均粒径1mm以下
であることが好ましい。1mmを超えると前記した焼結
性が顕著に低下するからである。好ましくは、0.1m
m以下が良い。次いで、前記混合物の母材(溶損面)へ
の塗布方法については、均一塗布の観点より、該混合物
に溶媒を加えてスラリー状化し、スプレーノズルを用い
て噴霧状で吹き付けするのが効果的である。固形物での
塗布では、付着性が低く、スラリー状のままコテ塗り等
の直塗りでは、作業負荷がかかるし、熱間では困難だか
らである。なお、塗布される混合物の平均粒径が1mm
を超えると、塗布面との密着性が低下して空隙が多くな
るので、そのためにも前記1mm以下の限定が有効であ
る。
In addition, these CaO sources, Al 2 O 3 sources,
It is preferable that the average particle diameter of any of the SiO 2 sources be 1 mm or less. If the thickness exceeds 1 mm, the sinterability described above is significantly reduced. Preferably, 0.1 m
m or less is good. Next, as for a method of applying the mixture to the base material (melted surface), from the viewpoint of uniform application, it is effective to add a solvent to the mixture to form a slurry and spray the mixture in a spray form using a spray nozzle. It is. This is because, in the case of coating with a solid material, the adhesiveness is low, and a direct coating such as iron coating with a slurry state requires a work load and is difficult to be performed hot. The average particle size of the mixture to be applied is 1 mm.
If it exceeds, the adhesion to the application surface is reduced and the number of voids is increased. Therefore, the above limitation of 1 mm or less is effective.

【0018】また、該混合物の噴霧圧は、特に限定する
ものではなく、塗布ができれば如何なる圧力でも良い。
さらに、スラリー化に用いる溶媒は、塗布に支障なけれ
ば限定するものではない。実際には、水が最も好ましい
が、該スラリーに分散剤を添加し、その濃度を調整して
スラリーの粘性を低下させて、吹き付けの作業性を向上
させることは、一層好ましい。
The spray pressure of the mixture is not particularly limited, and may be any pressure as long as the mixture can be applied.
Furthermore, the solvent used for slurrying is not limited as long as it does not interfere with the application. In practice, water is most preferable, but it is more preferable to add a dispersant to the slurry and adjust the concentration thereof to lower the viscosity of the slurry to improve the workability of spraying.

【0019】[0019]

【実施例】(実施例1)高炉の出銑に使用する主樋の内
張り耐火物を、本発明に係る補修方法を用いて補修し
た。
EXAMPLES Example 1 A refractory lining of a main gutter used for tapping a blast furnace was repaired by using the repair method according to the present invention.

【0020】この主樋は、SiC−Al23 系不定形
耐火物が前記「流し込み」で内張りされたものである
が、複数回の出銑に使用することで、内張り耐火物の一
部が溶損したものである。
This main gutter is made of a SiC-Al 2 O 3 -based irregular refractory lined by the above-mentioned “pour-in”, but when used for tapping a plurality of times, a part of the lined refractory is formed. Are eroded.

【0021】まず、溶損面に塗布し前記接着層を形成さ
せるCaO源、Al23 源、SiO2 源からなる混合
物を準備した。その組成は、CaO:50.0重量%、
Al23 :25.0重量%、及びSiO2 :25.0
重量%であり、平均粒径は、2.0〜0.1mmであ
る。該混合物に重量比で50/50になるよう水を加え
てスラリーとし、該スラリーをスプレーガンにて補修面
に、約5mmの厚みで塗布した。
First, a mixture comprising a CaO source, an Al 2 O 3 source, and a SiO 2 source to be applied to the eroded surface to form the adhesive layer was prepared. The composition is CaO: 50.0% by weight,
Al 2 O 3 : 25.0% by weight, and SiO 2 : 25.0%
% By weight, and the average particle size is 2.0 to 0.1 mm. Water was added to the mixture at a weight ratio of 50/50 to form a slurry, and the slurry was applied to the repaired surface with a spray gun to a thickness of about 5 mm.

【0022】その後、所謂「スラグライン」と呼ばれる
部位には、SiC−Al23 系(SiC50重量%、
Al23 45重量%)不定形耐火物を、「メタルライ
ン」と呼ばれる部位には、Al23 −SiC系(Al
23 :80重量%、SiC:13重量%)の不定形耐
火物を吹き付けた。これらの不定形耐火物は、いずれも
硬化剤としてアルミナセメントを3重量%、急結材とし
てアルミン酸ソーダを該不定形耐火物に対して0.5重
量%添加してある。また、この吹き付け時の補修面の温
度は、室温であり、目標の施工体の厚みは、150mm
〜2000mmとした。施工体を十分に乾燥した後、出
銑を開始して、約2万トン通銑後に出銑を中断して剥離
状態を調査した。調査した部位は、出銑口から2〜10
m離隔した位置である。
Thereafter, a so-called "slag line" is provided in a SiC-Al 2 O 3 system (50% by weight of SiC,
(Al 2 O 3 45% by weight) Amorphous refractories are placed in a portion called “metal line” in an Al 2 O 3 —SiC (Al
(2 O 3 : 80% by weight, SiC: 13% by weight) was sprayed. Each of these amorphous refractories contains 3% by weight of alumina cement as a hardening agent and 0.5% by weight of sodium aluminate as a quick setting material based on the amorphous refractory. The temperature of the repaired surface at the time of this spraying is room temperature, and the thickness of the target construction body is 150 mm.
20002000 mm. After sufficiently drying the construction body, tapping was started, and after about 20,000 tons of tapping, tapping was interrupted and the state of peeling was investigated. The sites surveyed were 2-10 from the taphole
m away from each other.

【0023】なお、本発明の効果を明確にするため、前
記接着層に代え、珪酸ナトリウムを噴霧、塗布した場合
(以下、珪酸ナトリウム塗布という)及び何も塗布せず
に、直接の不定形耐火物を吹き付けた場合(以下、無塗
布という)も別途行った。
In order to clarify the effect of the present invention, when the sodium silicate is sprayed and applied instead of the adhesive layer (hereinafter referred to as sodium silicate application), and without any application, a direct refractory refractory When an object was sprayed (hereinafter, referred to as non-application), it was separately performed.

【0024】以上の補修で得た結果を、一括して表1に
示す。表1より、無塗布では、吹き付けた不定形耐火物
の大半が剥離し、珪酸ナトリウム塗布でも、吹き付け量
の約半分が剥離していたことが明らかである。これに対
して、本発明に係る補修方法では、混合物の平均粒径が
比較的大きい2〜1.1mmの場合に、その後に吹き付
けた不定形耐火物の25〜10重量%程度は剥離する
が、平均粒径1mm以下では全く剥離していないことが
わかる。なお、剥離の程度は、損傷部の写真撮影から剥
離部面積を内張り耐火物の全体面積で割った数字であ
り、剥離部であるかの判断は、形態及び損耗速度が異常
に大きい部位を肉眼で観察して定めた。
The results obtained by the above repairs are collectively shown in Table 1. From Table 1, it is clear that most of the sprayed amorphous refractories were peeled off when no coating was performed, and that about half of the sprayed amount was also peeled even when sodium silicate was coated. On the other hand, in the repair method according to the present invention, when the average particle diameter of the mixture is relatively large, 2 to 1.1 mm, about 25 to 10% by weight of the irregularly shaped refractory sprayed thereafter peels off. It can be seen that when the average particle diameter is 1 mm or less, no peeling occurs. The degree of peeling is a number obtained by dividing the area of the peeled part by the total area of the refractory lining from the photographing of the damaged part. Observed and determined.

【0025】また、吹き付け補修後に施工体の損耗速度
を調査したところ、表2に示すように、最も損耗が大き
い出銑口から4m離れた位置で、「流し込み」で補修し
た場合の損耗速度が、通常4.6mm/1000tであ
ったのに対して、本発明に係る方法で補修した場合は、
4.8mm/1000tと殆ど遜色がない。一方、表2
は、珪酸ナトリウム塗布では、6.9mm/1000
t、無塗布では、8.4mm/1000tであり、従来
の補修方法では、施工体の剥離が早期に生じていること
をも示している。ここで、1000tとは、樋に流れた
(溶銑+スラグ)の1000トン当たりの意味である。
Further, when the wear rate of the construction body was investigated after the spraying repair, as shown in Table 2, the wear rate when the repair was performed by “pour-in” at a position 4 m away from the tap hole where the wear was the largest was found. , Which was usually 4.6 mm / 1000t, but when repaired by the method according to the present invention,
There is almost no inferiority of 4.8 mm / 1000t. On the other hand, Table 2
Is 6.9 mm / 1000 when coated with sodium silicate
t, 8.4 mm / 1000 t in the case of no coating, which also indicates that peeling of the construction body occurred early in the conventional repair method. Here, 1000 tons means (hot metal + slag) flowing into the gutter per 1000 tons.

【0026】[0026]

【表1】 [Table 1]

【0027】[0027]

【表2】 なお、効果を比較するために実施した珪酸ナトリウムを
塗布した場合の剥離部の割合は、重量で内張り耐火物全
体の52%で、無塗布の場合は、82%であった。
[Table 2] In addition, the ratio of the peeling part when applying sodium silicate which was implemented in order to compare the effects was 52% by weight of the entire lining refractory, and was 82% when it was not applied.

【0028】(実施例2)実施例1とほぼ同じ条件で、
CaO、Al23 、SiO2 のmol比率のみを種々
変えて、施工体の剥離及び損耗を比較した。その結果を
表3に示す。なお、CaO源、Al23 源、SiO2
源の平均粒径は、それぞれ0.2mmとした。
(Embodiment 2) Under substantially the same conditions as in Embodiment 1,
Exfoliation and abrasion of the construction body were compared by changing only the molar ratios of CaO, Al 2 O 3 , and SiO 2 . Table 3 shows the results. In addition, CaO source, Al 2 O 3 source, SiO 2
The average particle size of each source was 0.2 mm.

【0029】[0029]

【表3】 [Table 3]

【0030】表3より、CaO/Al23 /SiO2
のモル比率が、40〜60/20〜30/20〜30の
範囲では、施工体が全く剥離せず、結果として、本発明
に係る補修方法によれば、施工体の損耗速度が「流し込
み」施工による場合に比べて遜色がないことがわかる。
From Table 3, it can be seen that CaO / Al 2 O 3 / SiO 2
When the molar ratio is in the range of 40 to 60/20 to 30/20 to 30, the construction body does not peel at all, and as a result, according to the repair method of the present invention, the wear rate of the construction body is “poured”. It turns out that there is no inferiority to the case by construction.

【0031】なお、上記実施例では、本発明を高炉の主
樋に適用した場合について説明したが、本発明の対象
は、これに限定されるものではなく、溶銑とスラグと接
触する溶銑移送樋の内張り耐火物全般に対して同様に効
果を発揮するものである。
In the above embodiment, the case where the present invention is applied to a main gutter of a blast furnace has been described. However, the object of the present invention is not limited to this. It has the same effect on all refractory linings.

【0032】[0032]

【発明の効果】以上述べたように、本発明により、湿式
吹き付け材、つまり不定形耐火物の熱間接着性を高め、
耐用性の高い吹き付け施工体の品質を最大限に生かすこ
とができるようになる。その結果、不定形耐火物の吹き
付け補修で「流し込み」施工に匹敵する耐用性が得ら
れ、長期にわたり繰り返し補修も可能となったので、樋
材の原単位を、従来より大幅に削減できるようになる。
As described above, according to the present invention, the hot-sprayed material, that is, the hot adhesion of the amorphous refractory is improved,
This makes it possible to make the most of the quality of the highly durable sprayed construction. As a result, the service life equivalent to `` pour-in '' construction was obtained by spray repair of irregular refractories, and repeated repair was possible over a long period of time. Become.

───────────────────────────────────────────────────── フロントページの続き (72)発明者 野村 真 千葉県千葉市中央区川崎町1番地 川崎製 鉄株式会社千葉製鉄所内 Fターム(参考) 4K014 AD25 4K015 EC03 EC08 4K051 AA01 AB00 LA02 LA11  ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Makoto Nomura 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba F-term in the Chiba Works, Chiba Works (reference) 4K014 AD25 4K015 EC03 EC08 4K051 AA01 AB00 LA02 LA11

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 スラグを伴う溶銑を移送する樋に内張り
した耐火物の溶損面に、不定形耐火物を吹き付け、補修
する溶銑移送樋の補修方法において、 前記内張りした耐火物の溶損面に、スラグが付着した状
態のままで、ゲーレナイトが生成可能な組成のCaO
源、Al23 源、SiO2 源からなる混合物を含有す
るスラリーを付着せしめ、その上に前記不定形耐火物を
吹き付けることを特徴とする溶銑移送樋の補修方法。
1. A method for repairing a hot metal transfer gutter for spraying an irregular refractory onto a erosion surface of a refractory lining a gutter for transferring hot metal with slag, wherein the refractory surface of the lining is refractory. In addition, CaO with a composition capable of forming gehlenite while the slag remains attached
A method for repairing a hot metal transfer gutter, comprising applying a slurry containing a mixture comprising a source, an Al 2 O 3 source, and a SiO 2 source, and spraying the amorphous refractory thereon.
【請求項2】 前記CaO源、Al23 源、SiO2
源が、いずれも平均粒径1mm以下であって、CaO/
Al23 /SiO2 のモル比率が40〜60/20〜
30/20〜30であることを特徴とする請求項1記載
の溶銑移送樋の補修方法。
2. The CaO source, Al 2 O 3 source, SiO 2
All of the sources have an average particle size of 1 mm or less, and CaO /
Al 2 O 3 / SiO 2 molar ratio is 40-60 / 20-
The method according to claim 1, wherein the ratio is 30/20 to 30.
JP10235492A 1998-08-21 1998-08-21 Method for repairing molten metal transfer trough Withdrawn JP2000065484A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10235492A JP2000065484A (en) 1998-08-21 1998-08-21 Method for repairing molten metal transfer trough

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10235492A JP2000065484A (en) 1998-08-21 1998-08-21 Method for repairing molten metal transfer trough

Publications (1)

Publication Number Publication Date
JP2000065484A true JP2000065484A (en) 2000-03-03

Family

ID=16986855

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
JP (1) JP2000065484A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100851952B1 (en) * 2002-06-21 2008-08-12 주식회사 포스코 Method for early-discharging low-reductive material produced in repairing blast furnace wall
JP2019006630A (en) * 2017-06-23 2019-01-17 新日鐵住金株式会社 Alumina-magnesia based castable refractory
WO2023013284A1 (en) * 2021-08-06 2023-02-09 黒崎播磨株式会社 Dry spraying material for firing furnace

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100851952B1 (en) * 2002-06-21 2008-08-12 주식회사 포스코 Method for early-discharging low-reductive material produced in repairing blast furnace wall
JP2019006630A (en) * 2017-06-23 2019-01-17 新日鐵住金株式会社 Alumina-magnesia based castable refractory
WO2023013284A1 (en) * 2021-08-06 2023-02-09 黒崎播磨株式会社 Dry spraying material for firing furnace
JP2023024242A (en) * 2021-08-06 2023-02-16 黒崎播磨株式会社 Dry spray material for firing furnace

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