JP7375715B2 - Construction method for adding monolithic refractories - Google Patents
Construction method for adding monolithic refractories Download PDFInfo
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- JP7375715B2 JP7375715B2 JP2020160395A JP2020160395A JP7375715B2 JP 7375715 B2 JP7375715 B2 JP 7375715B2 JP 2020160395 A JP2020160395 A JP 2020160395A JP 2020160395 A JP2020160395 A JP 2020160395A JP 7375715 B2 JP7375715 B2 JP 7375715B2
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- 239000011823 monolithic refractory Substances 0.000 title claims description 102
- 238000010276 construction Methods 0.000 title claims description 23
- 239000002893 slag Substances 0.000 claims description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 31
- 229910052799 carbon Inorganic materials 0.000 claims description 28
- 238000000034 method Methods 0.000 claims description 17
- 229910052710 silicon Inorganic materials 0.000 claims description 14
- 239000010703 silicon Substances 0.000 claims description 14
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 5
- KMWBBMXGHHLDKL-UHFFFAOYSA-N [AlH3].[Si] Chemical compound [AlH3].[Si] KMWBBMXGHHLDKL-UHFFFAOYSA-N 0.000 claims description 5
- UAMZXLIURMNTHD-UHFFFAOYSA-N dialuminum;magnesium;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[Mg+2].[Al+3].[Al+3] UAMZXLIURMNTHD-UHFFFAOYSA-N 0.000 claims description 5
- 229910052596 spinel Inorganic materials 0.000 claims description 5
- 239000011029 spinel Substances 0.000 claims description 5
- 239000000853 adhesive Substances 0.000 description 14
- 230000001070 adhesive effect Effects 0.000 description 14
- 238000005452 bending Methods 0.000 description 9
- 239000002994 raw material Substances 0.000 description 9
- 238000007670 refining Methods 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000011819 refractory material Substances 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 2
- NIPNSKYNPDTRPC-UHFFFAOYSA-N N-[2-oxo-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 NIPNSKYNPDTRPC-UHFFFAOYSA-N 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000013001 point bending Methods 0.000 description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000009469 supplementation Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Description
本発明は、使用後あるいは使用中の不定形耐火物に、新たな不定形耐火物の原料を継ぎ足す不定形耐火物の継ぎ足し施工方法に関する。 The present invention relates to a construction method for adding new monolithic refractories to monolithic refractories after use or in use.
耐火物は鉄鋼精錬、非鉄精錬、ガラスの溶解炉、セメント焼成炉、ごみを燃やす焼却炉など、様々な設備に利用されている。不定形耐火物の流し込み施工では、一度度流し込み施工した不定形耐火物が損傷すると、不定形耐火物の全てを解体し、新たに施工し直すことが多い。しかしながら、不定形耐火物の流し込み特性を利用し、損傷した部分にのみ新たな不定形耐火物の原料を流し込んで継ぎ足し施工できれば、耐火物コストおよび補修コストの削減につながるだけでなく、廃耐火物の削減にも貢献できる。 Refractories are used in a variety of equipment, including steel refining, non-ferrous refining, glass melting furnaces, cement kilns, and garbage incinerators. In the pouring construction of monolithic refractories, if the cast monolithic refractories are damaged, it is often necessary to dismantle the entire cast and re-construct a new one. However, if we can utilize the pouring characteristics of monolithic refractories to pour new monolithic refractory raw materials only into damaged areas and replenish them, we can not only reduce the cost of refractories and repair costs, but also reduce waste refractories. It can also contribute to the reduction of
不定形耐火物を継ぎ足し施工するに際しては、不定形耐火物の継ぎ足し界面の接着強度を確保することが重要である。この継ぎ足し界面の接着強度を確保する技術として、特許文献１には、不定形耐火物の継ぎ足し施工を行う被補修表層に、酸化物耐火原料粉末、有機バインダー、ＳｉＣまたはＣ粉末で構成される中間層を形成させた後に継ぎ足し施工を行い、当該施工部を養生、乾燥させた後、マイクロ波を照射して接着強度を発現させる技術が開示されている。 When adding monolithic refractories and constructing them, it is important to ensure the adhesive strength at the interface of adding monolithic refractories. As a technique for securing the adhesive strength at this replenishment interface, Patent Document 1 discloses that an intermediate layer composed of an oxide refractory raw material powder, an organic binder, and SiC or C powder is applied to the surface layer of the monolithic refractory to be repaired. A technique has been disclosed in which after a layer is formed, additional construction is performed, the construction part is cured and dried, and then microwaves are irradiated to develop adhesive strength.
特許文献１に開示された技術では、被補修表層に酸化物耐火原料粉末、有機バインダー、ＳｉＣまたはＣ粉末で構成される中間層を形成し、さらに、養生、乾燥させた後にマイクロ波を照射するので加工の手間がかかり加工コストが高くなる、という課題があった。本発明は、このような従来技術の課題を鑑みてなされたものであり、その目的は、簡便な方法で継ぎ足し部の接着強度を高めることができる不定形耐火物の継ぎ足し施工方法を提供することである。 In the technique disclosed in Patent Document 1, an intermediate layer composed of an oxide refractory raw material powder, an organic binder, and SiC or C powder is formed on the surface layer to be repaired, and then microwaves are irradiated after curing and drying. Therefore, there was a problem that the processing was labor-intensive and the processing cost was high. The present invention has been made in view of the problems of the prior art, and its purpose is to provide a construction method for adding monolithic refractories that can increase the adhesive strength of the added portion in a simple manner. It is.
上記課題を解決するための手段は、以下の通りである。
（１）不定形耐火物の継ぎ足し施工方法であって、継ぎ足し施工する不定形耐火物の継ぎ足し面におけるスラグが付着した付着面の面積率を５０％以下にした後に、前記継ぎ足し面に新たな不定形耐火物を継ぎ足し施工する、不定形耐火物の継ぎ足し施工方法。
（２）前記継ぎ足し面に０．０１０ｇ／ｃｍ２以上０．２５０ｇ／ｃｍ２以下の水を付着させた後に、新たな不定形耐火物を継ぎ足し施工する、（１）に記載の不定形耐火物の継ぎ足し施工方法。
（３）前記不定形耐火物は、アルミナ－マグネシア質、アルミナ－スピネル質、アルミナ－マグネシア－カーボン質、アルミナ－スピネル－カーボン質、アルミナ－炭化ケイ素－カーボン質、アルミナ－ろう石－炭化ケイ素－カーボン質、炭化ケイ素－アルミナ－カーボン質、または、アルミナ－カーボン－炭化ケイ素質の不定形耐火物である、（１）または（２）に記載の不定形耐火物の継ぎ足し施工方法。
The means for solving the above problems are as follows.
(1) A method for replenishing monolithic refractories, in which the area ratio of the adhering surface to which slag has adhered on the replenishing surface of the monolithic refractory to be replenished is reduced to 50% or less, and then a new defect is added to the refilling surface. A construction method for adding fixed-shaped refractories.
(2) The monolithic refractory according to (1), wherein a new monolithic refractory is added and constructed after attaching water of 0.010 g/cm 2 or more and 0.250 g/cm 2 or less to the added surface. Construction method for adding patches.
(3) The monolithic refractories include alumina-magnesia, alumina-spinel, alumina-magnesia-carbon, alumina-spinel-carbon, alumina-silicon carbide-carbon, and alumina-waxite-silicon carbide. The method for adding a monolithic refractory according to (1) or (2), which is a monolithic refractory made of carbon, silicon carbide-alumina-carbon, or alumina-carbon-silicon carbide.
本発明に係る不定形耐火物の継ぎ足し施工方法では、不定形耐火物の継ぎ足し面に付着したスラグの面積率を５０％以下にした後に、当該継ぎ足し面に新たな不定形耐火物を継ぎ足し施工することで、継ぎ足し部の接着強度を高めることができる。これのため、本発明に係る不定形耐火物の継ぎ足し施工方法を実施することで、従来技術のように加工の手間をかけることなく、簡便に継ぎ足し部の接着強度を高めながら、新たな不定形耐火物を継ぎ足し施工できる。 In the method for adding monolithic refractories according to the present invention, after reducing the area ratio of slag adhering to the adding surface of the monolithic refractory to 50% or less, a new monolithic refractory is added to the adding surface. By doing so, the adhesive strength of the joining part can be increased. For this reason, by implementing the construction method for refilling monolithic refractories according to the present invention, it is possible to easily increase the adhesive strength of the refilling part and create new monolithic refractories without the hassle of processing as in the conventional technology. Can be constructed by adding refractories.
以下、本発明を本発明の実施形態を通じて説明する。本実施形態に係る不定形耐火物の継ぎ足し施工方法で継ぎ足し施工される不定形耐火物は、鉄鋼精錬炉、非鉄精錬炉やごみを燃やす焼却炉（以後、「鉄鋼精錬炉等」と記載する。）などで使用される不定形耐火物である。鉄鋼精錬炉等で使用された不定形耐火物の表面にはスラグが固着していることがある。これは、鉄鋼精錬炉等が稼働されていない非稼働中に耐火物表面温度が下がり、この温度低下により耐火物表面に付着していたスラグが固着したものである。ここで、スラグとは、鉄鋼精錬、非鉄精錬工程において、製品から炭素やリン、硫黄などの不純物元素を取り除く工程や、ごみを燃やす焼却工程で発生する酸化物を主原料とする副産物である。 Hereinafter, the present invention will be explained through embodiments of the present invention. The monolithic refractories that are supplemented by the monolithic refractory supplement construction method according to the present embodiment are steel refining furnaces, nonferrous smelting furnaces, and waste incinerators (hereinafter referred to as "steel smelting furnaces, etc."). ) is a monolithic refractory used in Slag may adhere to the surface of monolithic refractories used in steel refining furnaces and the like. This is because the surface temperature of the refractory decreases when the steel refining furnace or the like is not in operation, and this temperature drop causes the slag that had adhered to the surface of the refractory to stick. Here, slag is a byproduct whose main raw material is oxides generated during the process of removing impurity elements such as carbon, phosphorus, and sulfur from products in steel refining and non-ferrous refining processes, and the incineration process of burning waste.
スラグが固着した不定形耐火物の表面に、新たな不定形耐火物を継ぎ足し施工すると、スラグと不定形耐火物との界面が脆弱部となり、継ぎ足し部の接着強度が低下する。このため、本実施形態に係る不定形耐火物の継ぎ足し施工方法では、新たな不定形耐火物を継ぎ足し施工する前に、不定形耐火物の継ぎ足し面に対するスラグ付着面の面積率が５０％以下になるまで、不定形耐火物の継ぎ足し面に付着したスラグを除去する。これにより、不定形耐火物の継ぎ足し部の接着強度を高めながら、不定形耐火物を継ぎ足し施工できる。なお、スラグの付着量が少なくなればなるほど継ぎ足し部の接着強度は高まるので、スラグ付着面の面積率の下限は０％である。 When a new monolithic refractory is added to the surface of the monolithic refractory to which slag has adhered, the interface between the slag and the monolithic refractory becomes a fragile part, and the adhesive strength of the added part decreases. For this reason, in the method for adding monolithic refractories according to the present embodiment, before adding and constructing new monolithic refractories, the area ratio of the slag adhering surface to the adding surface of the monolithic refractories is 50% or less. Remove the slag adhering to the joining surface of the monolithic refractory until the As a result, the monolithic refractory can be added and constructed while increasing the adhesive strength of the part where the monolithic refractory is being added. Note that the lower the amount of slag adhesion, the higher the adhesive strength of the added portion, so the lower limit of the area ratio of the slag adhesion surface is 0%.
不定形耐火物の継ぎ足し面に固着したスラグは、ハンマーやピッケル等を用いて不定形耐火物の表面からスラグを剥がすことで除去してもよく、また、不定形耐火物の継ぎ足し面に固着したスラグをグラインドすることで除去してもよい。 Slag stuck to the joining surface of monolithic refractories may be removed by peeling the slag from the surface of the monolithic refractory using a hammer, ice ax, etc. The slag may be removed by grinding.
継ぎ足し施工する不定形耐火物の継ぎ足し面は、不定形耐火物の稼働面において溶損等により損傷した部分の表面である。このため、不定形耐火物の継ぎ足し面の面積は、不定形耐火物の施工図面に基づき、施工直後の不定形耐火物における稼働面側の表面形状と継ぎ足し施工する時点の不定形耐火物における稼働面側の表面形状との差分形状から求められる。また、当該差分形状は、表面プロフィール計を用いて測定された施工直後の不定形耐火物における稼働面側の表面形状と、継ぎ足し施工する時点の不定形耐火物における稼働面側の表面形状とから特定できる。 The replenishing surface of the monolithic refractory that is to be refilled is the surface of the portion of the operating surface of the monolithic refractory that has been damaged due to melting loss or the like. For this reason, the area of the surface to be added to the monolithic refractory is determined based on the construction drawings of the monolithic refractory, the surface shape of the operating surface side of the monolithic refractory immediately after construction, and the operating surface of the monolithic refractory at the time of construction. It is determined from the difference shape from the surface shape on the side. In addition, the differential shape is based on the surface shape of the working surface side of the monolithic refractory immediately after construction, measured using a surface profile meter, and the surface shape of the working surface side of the monolithic refractory at the time of additional construction. Can be identified.
スラグ付着面の面積は、例えば、鉄鋼精錬炉に用いられている不定形耐火物の稼働面側を撮像した画像データを解析することで求められる。カーボンを含有しない不定形耐火物の色は灰色であり、また、カーボンを含有する不定形耐火物の色は黒味かかった灰色である。一方、スラグの色はタールのような黒色であり、色および質感が異なることから、特定された差分形状に対応した継ぎ足し面において、スラグが付着した付着面とスラグが付着していない継ぎ足し面とを画像データを解析することで区別し、スラグが付着した付着面の面積を継ぎ足し面の面積で除し、１００を乗じることでスラグが付着した付着面の面積率を求めることができる。 The area of the slag adhesion surface is determined, for example, by analyzing image data obtained by capturing an image of the operating surface side of a monolithic refractory used in a steel refining furnace. The color of the monolithic refractory that does not contain carbon is gray, and the color of the monolithic refractory that contains carbon is blackish gray. On the other hand, the color of slag is black like tar, and the color and texture are different. Therefore, in the replenishment surface corresponding to the specified differential shape, there is a difference between the adhesion surface with slag and the replenishment surface without slag. can be distinguished by analyzing image data, and by dividing the area of the adhering surface to which slag has adhered by the area of the added surface and multiplying by 100, the area ratio of the adhering surface to which slag has adhered can be determined.
また、継ぎ足し施工する不定形耐火物の継ぎ足し面に０．０１０ｇ／ｃｍ２以上０．２５０ｇ／ｃｍ２以下の水を付着させてから新たな不定形耐火物を継ぎ足し施工することが好ましい。継ぎ足し施工する不定形耐火物の継ぎ足し面が乾燥状態（水の付着量が０．０１０ｇ／ｃｍ２未満）であると、新たに継ぎ足す不定形耐火物原料中の水分が元の不定形耐火物に吸収され、水分が少なくなった接合界面が脆弱部となるので接合部の強度が低下する。また、不定形耐火物の継ぎ足し面の水付着量が０．２５０ｇ／ｃｍ２より多くなると、接合界面に水が過剰にある状態となり、新たに継ぎ足す耐火物原料中において、バインダーに対する水の量が過剰になって接合部の強度が低下する。したがって、継ぎ足し施工する不定形耐火物の継ぎ足し面に付着させる水分量は０．０１０ｇ／ｃｍ２以上０．２５０ｇ／ｃｍ２以下の範囲内であることが好ましい。 Furthermore, it is preferable to apply a new monolithic refractory after applying 0.010 g/cm 2 or more and 0.250 g/cm 2 or less of water to the surface of the monolithic refractory to be supplemented. If the surface of the monolithic refractory to be refilled is dry (the amount of adhering water is less than 0.010 g/ cm2 ), the water in the raw material of the monolithic refractory to be newly added will be absorbed by the original monolithic refractory. The joint interface, where moisture is reduced, becomes a weak part, reducing the strength of the joint. Furthermore, if the amount of water adhering to the joining surface of the monolithic refractory exceeds 0.250 g/ cm2 , there will be an excessive amount of water at the joint interface, and the amount of water relative to the binder in the newly added refractory raw material will increase. becomes excessive and the strength of the joint decreases. Therefore, it is preferable that the amount of moisture attached to the replenishing surface of the monolithic refractory to be refilled is in the range of 0.010 g/cm 2 or more and 0.250 g/cm 2 or less.
継ぎ足し施工する不定形耐火物の継ぎ足し面に水を付着させる方法は、例えば、水の流量を制御できるスプレーノズルを有する散水設備を用いて不定形耐火物の継ぎ足し面に水を塗布してよく、霧吹き状に散水可能なスプレーボトルを用いて不定形耐火物の継ぎ足し面に水を塗布してもよい。水を塗布した後は、継ぎ足し面の水が乾かないように、塗布後２時間以内に新たな不定形耐火物を継ぎ足し施工することが好ましく、塗布後１時間以内に新たな不定形耐火物を継ぎ足し施工することがより好ましい。また、継ぎ足し施工する環境は、不定形耐火物の表面に付着させた水の蒸発を抑制することを目的として、温度が０℃以上４０℃以下であり、湿度が３０％以上１００％以下である環境で継ぎ足し施工することが好ましい。 A method for applying water to the replenishing surface of the monolithic refractory to be refilled may be, for example, applying water to the replenishing surface of the monolithic refractory using a water spraying equipment having a spray nozzle that can control the flow rate of water. Water may be applied to the joining surface of the monolithic refractory using a spray bottle that can spray water in a mist-like manner. After applying water, it is preferable to add new monolithic refractories within 2 hours after application to prevent the water from drying out on the added surface, and install new monolithic refractories within 1 hour after application. It is more preferable to perform additional construction. In addition, in order to suppress the evaporation of water attached to the surface of the monolithic refractories, the environment for refilling should be a temperature of 0°C or more and 40°C or less, and a humidity of 30% or more and 100% or less. It is preferable to perform patching construction in the environment.
実施形態に係る不定形耐火物の継ぎ足し施工方法で継ぎ足し施工される不定形耐火物は、例えば、アルミナ－マグネシア質、アルミナ－スピネル質、アルミナ－マグネシア－カーボン質、アルミナ－スピネル－カーボン質、アルミナ－炭化ケイ素－カーボン質、アルミナ－ろう石－炭化ケイ素－カーボン質、炭化ケイ素－アルミナ－カーボン質、または、アルミナ－カーボン－炭化ケイ素質の不定形耐火物である（含有量が多い順に成分を記載する）。これらの不定形耐火物を本実施形態に係る不定形耐火物の継ぎ足し施工方法で継ぎ足し施工することで、従来技術のように加工の手間をかけることなく、簡便に継ぎ足し部の接着強度を向上させながら、新たな不定形耐火物を継ぎ足し施工できる。そして、このように不定形耐火物の継ぎ足し施工をすることで、耐火物コストおよび補修コストの削減だけでなく、廃耐火物の削減にも貢献できる。 The monolithic refractories to be supplemented by the monolithic refractory supplementation method according to the embodiment include, for example, alumina-magnesia, alumina-spinel, alumina-magnesia-carbon, alumina-spinel-carbon, and alumina. - Silicon carbide-carbon, alumina-waxite-silicon carbide-carbon, silicon carbide-alumina-carbon, or alumina-carbon-silicon carbide. ). By adding these monolithic refractories using the monolithic refractory fixing method according to the present embodiment, the adhesive strength of the added parts can be easily improved without requiring the effort of processing as in the conventional technology. At the same time, new monolithic refractories can be added and constructed. By adding monolithic refractories in this manner, it is possible to contribute not only to a reduction in refractory costs and repair costs, but also to a reduction in waste refractories.
次に、本実施形態に係る不定形耐火物の継ぎ足し施工方法を実施して継ぎ足し施工した実施例を説明する。本実施例ではＪＩＳ Ｒ ２５５３「キャスタブル耐火物の強さ試験方法」に準拠して作製された不定形耐火物の試験片を用いた。試験片の大きさは４０ｍｍ×４０ｍｍ×１６０ｍｍである。当該試験片を３点曲げ強度試験を行って試験片を２分割し、その断面を継ぎ足し面とした。作製した不定形耐火物の組成を下記表１に示す。 Next, an example in which replenishment was carried out by implementing the method for replenishing monolithic refractories according to the present embodiment will be described. In this example, a test piece of a monolithic refractory manufactured in accordance with JIS R 2553 "Strength test method for castable refractories" was used. The size of the test piece is 40 mm x 40 mm x 160 mm. The test piece was subjected to a three-point bending strength test, and the test piece was divided into two parts, and the cross section was used as the joining surface. The composition of the manufactured monolithic refractory is shown in Table 1 below.
不定形耐火物の試験片の継ぎ足し面（４０ｍｍ×４０ｍｍ）に、粉末状のスラグを所定量置き、その後、大気雰囲気にて１３５０℃で３時間焼成することで、継ぎ足し面にスラグを付着させた。スラグ付着前後の試験片の重量を計測し、その重量増加分からスラグの付着量を算出した。また、スラグ付着面の面積率は、スラグ付着前後の継ぎ足し面をデジタルカメラで撮像して生成された画像データを解析することで継ぎ足し面に対するスラグ付着面の面積率（％）を算出した。 A predetermined amount of powdered slag was placed on the splicing surface (40 mm x 40 mm) of a test piece of monolithic refractory, and then the slag was attached to the splicing surface by baking at 1350°C for 3 hours in an air atmosphere. . The weight of the test piece before and after adhesion of slag was measured, and the amount of adhesion of slag was calculated from the increase in weight. Furthermore, the area ratio (%) of the slag adhering surface to the replenishing surface was calculated by analyzing image data generated by capturing images of the replenishing surface before and after slag adhesion with a digital camera.
また、不定形耐火物の試験片の継ぎ足し面に筆を用いて水を所定量付着させた。水の付着量は、水の付着前後の試験片の重量を計測し、その重量増加分から水の付着量を算出した。継ぎ足し面に水を付着させた後、ただちに試験片を金型に挿入し、試験片の継ぎ足し面に同じ種類の不定形耐火物の原料を金型に流し込み、温度２０±３℃、湿度８０％以上の雰囲気下で２４時間養生した後、脱型して強度測定用の試験片を作製した。強度試験用の試験片に上述した３点曲げ強度試験を実施し、試験片の常温曲げ強度を測定した。使用した不定形耐火物の種類、スラグ付着面の面積率、スラグ付着量、水付着量および常温曲げ強度の測定結果を下記表３、４に示す。 Further, a predetermined amount of water was applied to the spliced surface of the monolithic refractory test piece using a brush. The amount of water attached was determined by measuring the weight of the test piece before and after the attachment of water, and calculating the amount of attached water from the increase in weight. After applying water to the splicing surface, immediately insert the test piece into the mold, pour the same type of monolithic refractory raw material into the mold on the splicing surface of the test piece, and heat at a temperature of 20±3℃ and a humidity of 80%. After curing in the above atmosphere for 24 hours, the mold was demolded to prepare a test piece for strength measurement. The three-point bending strength test described above was carried out on the test piece for the strength test, and the normal temperature bending strength of the test piece was measured. The types of monolithic refractories used, the area ratio of the slag adhesion surface, the amount of slag adhesion, the amount of water adhesion, and the measurement results of room temperature bending strength are shown in Tables 3 and 4 below.
発明例１～４０は、継ぎ足し面におけるスラグ付着面の面積率を５０％以下にして不定形耐火物原料を継ぎ足し施工した施工例である。一方、比較例１～１７は、継ぎ足し面におけるスラグ付着面の面積率を５０％より高くして不定形耐火物原料を継ぎ足し施工した施工例である。表３、４に示すように、継ぎ足し面におけるスラグ付着面の面積率を５０％以下にして新たな不定形耐火物を継ぎ足し施工した不定形耐火物の曲げ強度の最小値が０．２８ＭＰａ（発明例２３、３９）であったのに対し、継ぎ足し面におけるスラグ付着面の面積率を５０％より高くして新たな不定形耐火物を継ぎ足し施工した不定形耐火物の曲げ強度の最大値は０．１３ＭＰａ（比較例４）であった。これらの結果から、不定形耐火物の継ぎ足し面に新たな不定形耐火物を継ぎ足し施工するにあたり、継ぎ足し面におけるスラグ付着面の面積率を５０％以下にすることで、継ぎ足し施工された不定形耐火物の継ぎ足し部の接着強度を向上できることが確認された。 Invention Examples 1 to 40 are construction examples in which the monolithic refractory raw material was supplemented and the area ratio of the slag adhesion surface on the supplemented surface was 50% or less. On the other hand, Comparative Examples 1 to 17 are construction examples in which the monolithic refractory raw material was added and constructed with the area ratio of the slag adhering surface on the added surface being higher than 50%. As shown in Tables 3 and 4, the minimum bending strength of monolithic refractories constructed by adding new monolithic refractories is 0.28 MPa (invention Examples 23 and 39), whereas the maximum bending strength of monolithic refractories constructed by adding new monolithic refractories with the area ratio of the slag adhesion surface on the supplemented surface being higher than 50% is 0. .13 MPa (Comparative Example 4). From these results, when adding new monolithic refractories to the added surface of monolithic refractories, by keeping the area ratio of the slag adhesion surface on the added surface to 50% or less, the monolithic refractories that were added and constructed It was confirmed that the adhesive strength of the joints can be improved.
また、発明例１－３と発明例７－９は、不定形耐火物の種類とスラグ付着面の面積率が同じで、継ぎ足し面における水付着量のみが異なる継ぎ足し施工例である。発明例１－３は、継ぎ足し面の水付着量が０．０１０ｇ／ｃｍ２以上０．２５０ｇ／ｃｍ２以下を満足する継ぎ足し施工例であり、その曲げ強度は０．７０～２．６０ＭＰａとなった。一方、発明例７－９は、継ぎ足し面の水付着量が０．０１０ｇ／ｃｍ２以上０．２５０ｇ／ｃｍ２以下を満足しない継ぎ足し施工例であり、その曲げ強度は０．３１～０．４０ＭＰａとなった。 Further, Invention Example 1-3 and Invention Example 7-9 are examples of replenishment construction in which the type of monolithic refractory and the area ratio of the slag adhesion surface are the same, and only the amount of water adhering to the replenishment surface is different. Invention example 1-3 is an example of replenishment construction in which the amount of water adhering to the replenishment surface satisfies the range of 0.010 g/cm 2 or more and 0.250 g/cm 2 or less, and its bending strength is 0.70 to 2.60 MPa. Ta. On the other hand, Invention Example 7-9 is an example of replenishment construction in which the amount of water adhering to the replenishment surface does not satisfy the range of 0.010 g/cm 2 or more and 0.250 g/cm 2 or less, and its bending strength is 0.31 to 0.40 MPa. It became.
また、他の不定形耐火物においても、継ぎ足し面の水付着量が０．０１０ｇ／ｃｍ２以上０．２５０ｇ／ｃｍ２以下を満足する継ぎ足し施工で施工された不定形耐火物の曲げ強度は、継ぎ足し面の水付着量が０．０１０ｇ／ｃｍ２以上０．２５０ｇ／ｃｍ２以下を満足しない継ぎ足し施工で施工された不定形耐火物の曲げ強度よりも高くなった。これらの結果から、不定形耐火物の継ぎ足し面に新たな不定形耐火物を継ぎ足し施工するにあたり、継ぎ足し面における水の付着量を０．０１０ｇ／ｃｍ２以上０．２５０ｇ／ｃｍ２以下にすることが好ましく、これにより、継ぎ足し施工された不定形耐火物の継ぎ足し部の接着強度を向上できることが確認された。 In addition, regarding other monolithic refractories, the bending strength of monolithic refractories constructed by refilling where the amount of water adhesion on the refilling surface satisfies the range of 0.010 g/cm 2 or more and 0.250 g/cm 2 or less is as follows: The bending strength was higher than the bending strength of monolithic refractories constructed by replenishment work in which the amount of water adhesion on the replenishment surface did not satisfy the range of 0.010 g/cm 2 or more and 0.250 g/cm 2 or less. From these results, when adding new monolithic refractories to the added surface of monolithic refractories, the amount of water adhering to the added surface should be 0.010 g/cm 2 or more and 0.250 g/cm 2 or less. is preferable, and it has been confirmed that this makes it possible to improve the adhesive strength of the joined part of the monolithic refractory that has been refilled.
表３の発明例１－４０に示すように、不定形耐火物として、アルミナ－マグネシア質、アルミナ－スピネル質、アルミナ－マグネシア－カーボン質、アルミナ－スピネル－カーボン質、アルミナ－炭化ケイ素－カーボン質、アルミナ－ろう石－炭化ケイ素－カーボン質、炭化ケイ素－アルミナ－カーボン質、または、アルミナ－カーボン－炭化ケイ素質の不定形耐火物の何れを用いたとしても、継ぎ足し面におけるスラグ付着面の面積率を５０％以下にすることで、継ぎ足し部の接着強度を向上できることが確認され、また、継ぎ足し面における水の付着量を０．０１０ｇ／ｃｍ２以上０．２５０ｇ／ｃｍ２以下にすることで、継ぎ足し部の接着強度を向上できることが確認された。これらの結果から、本実施形態に係る不定形耐火物の継ぎ足し施工方法がアルミナ－マグネシア質、アルミナ－スピネル質、アルミナ－マグネシア－カーボン質、アルミナ－スピネル－カーボン質、アルミナ－炭化ケイ素－カーボン質、アルミナ－ろう石－炭化ケイ素－カーボン質、炭化ケイ素－アルミナ－カーボン質、または、アルミナ－カーボン－炭化ケイ素質の不定形耐火物の何れにも適用できることが確認された。 As shown in Invention Example 1-40 in Table 3, the monolithic refractories include alumina-magnesia, alumina-spinel, alumina-magnesia-carbon, alumina-spinel-carbon, and alumina-silicon carbide-carbon. , alumina-waxite-silicon carbide-carbon, silicon carbide-alumina-carbon, or alumina-carbon-silicon carbide, the area of the slag adhesion surface on the joining surface It has been confirmed that the adhesive strength of the spliced part can be improved by reducing the ratio to 50% or less, and by setting the amount of water attached to the spliced surface to 0.010 g/cm 2 or more and 0.250 g/cm 2 or less. It was confirmed that the adhesive strength of the joint can be improved. From these results, the method for refilling the monolithic refractory according to this embodiment is alumina-magnesia, alumina-spinel, alumina-magnesia-carbon, alumina-spinel-carbon, and alumina-silicon carbide-carbon. It was confirmed that the present invention can be applied to any of alumina-waxite-silicon carbide-carbon, silicon carbide-alumina-carbon, or alumina-carbon-silicon carbide monolithic refractories.
Claims (2)
継ぎ足し施工する不定形耐火物の継ぎ足し面におけるスラグが付着した付着面の面積率を５０％以下にし、前記継ぎ足し面に０．０１０ｇ／ｃｍ２以上０．２５０ｇ／ｃｍ２以下の水を付着させた後に、前記継ぎ足し面に新たな不定形耐火物を継ぎ足し施工する、不定形耐火物の継ぎ足し施工方法。 A construction method for adding monolithic refractories,
The area ratio of the adhesion surface to which slag has adhered on the refilling surface of the monolithic refractory to be refilled is set to 50% or less, and water of 0.010 g/cm 2 or more and 0.250 g/cm 2 or less is attached to the refilling surface. A method for adding monolithic refractories, in which a new monolithic refractory is then added to the added surface.
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| JP2016172647A (en) | 2015-03-16 | 2016-09-29 | 品川リフラクトリーズ株式会社 | Monolithic refractory for maintenance |
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| JPS5772758A (en) * | 1980-10-27 | 1982-05-07 | Nippon Steel Corp | Method for repairing tundish for continuous casting |
| JPS61137656A (en) * | 1984-12-07 | 1986-06-25 | Nippon Steel Corp | Cleaning method of tundish lining |
| JP2766660B2 (en) * | 1989-02-23 | 1998-06-18 | 川崎炉材株式会社 | Repair method of molten metal container |
| JPH0633179B2 (en) * | 1989-06-17 | 1994-05-02 | 黒崎窯業株式会社 | Irregular refractory for pouring |
| JPH03134487A (en) * | 1989-10-20 | 1991-06-07 | Sumitomo Metal Ind Ltd | Construction method for castable refractory |
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| JP2001009566A (en) | 1999-06-29 | 2001-01-16 | Kobe Steel Ltd | Lining structure of tundish |
| JP2001343192A (en) | 2000-05-31 | 2001-12-14 | Kawasaki Steel Corp | Method for executing wet spraying of monolithic refractory |
| JP2004317097A (en) | 2003-04-21 | 2004-11-11 | Shinagawa Refract Co Ltd | Construction method of coated monolithic refractory of lance pipe by horizontal casting construction |
| JP2016172647A (en) | 2015-03-16 | 2016-09-29 | 品川リフラクトリーズ株式会社 | Monolithic refractory for maintenance |
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