JPH0320302B2 - - Google Patents
Info
- Publication number
- JPH0320302B2 JPH0320302B2 JP27905487A JP27905487A JPH0320302B2 JP H0320302 B2 JPH0320302 B2 JP H0320302B2 JP 27905487 A JP27905487 A JP 27905487A JP 27905487 A JP27905487 A JP 27905487A JP H0320302 B2 JPH0320302 B2 JP H0320302B2
- Authority
- JP
- Japan
- Prior art keywords
- permanent
- material layer
- lining
- layer
- furnace
- 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.)
- Expired
Links
- 239000000463 material Substances 0.000 claims description 53
- 239000011819 refractory material Substances 0.000 claims description 26
- 239000002184 metal Substances 0.000 claims description 16
- 229910052751 metal Inorganic materials 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- 229910017053 inorganic salt Inorganic materials 0.000 claims description 5
- 239000010410 layer Substances 0.000 description 45
- 239000011248 coating agent Substances 0.000 description 11
- 230000000694 effects Effects 0.000 description 8
- 238000005245 sintering Methods 0.000 description 8
- 239000011449 brick Substances 0.000 description 7
- 238000000576 coating method Methods 0.000 description 7
- 239000011247 coating layer Substances 0.000 description 5
- 230000006378 damage Effects 0.000 description 5
- 230000006866 deterioration Effects 0.000 description 5
- 150000003839 salts Chemical class 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 229910004298 SiO 2 Inorganic materials 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 230000003628 erosive effect Effects 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 235000002597 Solanum melongena Nutrition 0.000 description 1
- 244000061458 Solanum melongena Species 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- -1 paint and grease Chemical class 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 235000021317 phosphate Nutrition 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Landscapes
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
Description
＜産業上の利用分野＞
本発明は、取鍋やタンデイツシユ等の溶融金属
容器の永久張炉材の保護方法に関するものであ
る。
＜従来の技術＞
近年、取鍋、タンデイツシユ等溶融金属容器の
内張炉材としては、その施工の簡便性および、炉
材費用の低減の見地から流し込み耐火材料の使用
が増大している。
流し込み耐火材料を溶融金属容器の内張炉材と
して使用すると、その乾燥時に永久張炉材層中へ
流し込み耐火材料中の水分が浸透するとともにバ
インダー成分としてのSiO2，Na2O等の成分が移
動する。このため、溶融金属容器の温度上昇時に
これ等移動成分の軟化溶融により永久張炉材層と
流し込み材層とが強固に接着するとともに、浸透
水分の気化により永久張炉材層の組織破壊が生じ
る。
これらのことから溶融金属容器の各サイクルの
使用末期で永久張炉材層の劣化による溶融金属の
漏洩事故が懸念されるとともに、内張流し込み耐
火材層と永久張炉材層とが、強固に接着している
ため、使用後残存流し込み材層を解体する際に、
部分的に永久張炉材層を損傷・剥落させてしま
い、永久張炉材層の積み替え量が増加するといつ
た問題が生じる。
このような内張流し込み耐火材と永久張炉材層
との固着を防止する技術として、有機繊維、耐火
粉末からなるスラリーを塗布する方法（特開昭53
−137028号参照）が開示されているがこの方法で
は、耐火粉末を使用しているため、比較的低温の
温度域での水、分散剤（ポノビニール、アルコー
ル、でん粉のり）の気化燃焼の後に生じる流し込
み耐火材料と永久張炉材層との部分的焼結反応を
防止することは出来ない。また、耐火粉末として
低融物を含む材料等を使用すれば、更に上記の焼
結反応を助長することになる。また、上記の方法
ではスラリーとするための媒体として水を使用す
るため、永久張炉材層への浸透水分の気化による
組織破壊を招く危険性がある。
＜発明が解決しようとする問題点＞
本発明は、前記のような従来技術の問題点を解
消し、内張流し込み耐火材と永久張炉材層との固
着、融着を有効に防止して永久張炉材の積み替え
量を減ずるとともに、内張り流し込み耐火材から
の永久張炉材層への水分移動を防ぎ、永久張炉材
層の組織劣化を防止することのできる溶融金属の
永久張炉材層の保護方法を提供するためになされ
たものである。
＜問題点を解決するための手段＞
本発明者は、内張流し込み材と永久張炉材との
固着・融着の防止、内張流し込み材から永久張炉
材への水分移動の防止について鋭意研究を重ねた
結果、無機塩と黒鉛粉末とを特定割合で組み合わ
せたペーストを両者の間に塗布することによつて
目的を達することができるとの知見をえ、この知
見にもとづいて本発明をなすに至つた。
本発明は、永久張炉材層の表面に内張り炉材と
して流し込み耐火材料を使用する溶融金属容器に
おいて、永久張炉材層の表面に30〜70重量％の黒
鉛粉末を含有する無機塩からなるペーストを１〜
５mmの厚みで塗布することを特徴とする溶融金属
容器の永久張炉材の保護方法、である。
＜作用＞
第１図に本発明の一実施例の断面図を示す。溶
鋼取鍋の鉄皮１の内面に永久張炉材層２が内張り
され、それと内張流し込み耐火材層４との間に黒
鉛を含有する無機塩からなるペースト塗布層３が
塗布されている。
流し込み耐火材４を施工後、乾燥昇温の過程
で、流し込み材層４中の水分の大部分は炉内側即
ち図の矢印で示す方向へ蒸発するが、背面（永久
張炉材層側）近傍のものは永久張炉材層２へ移行
しようとし、同時にSiO2，Na2O等の成分が永久
張部へ移行しようとする。これらの移行を防止す
るためにはペーストの塗布層３は水分の蒸発が完
全に終了する温度域（約200℃以上）まで安定し
た緻密な被膜層である必要があり、有機塩よりも
無機塩で構成することが好ましい。
また、無機塩のみでは、500℃以上の高温域で
軟化溶融し、焼結反応を促進させる。この流し込
み材と永久張炉材間の高温域での焼結を防止する
意味から塗布剤（ペースト）中に黒鉛粉末を含有
させることが有効である。その量は30重量％から
70重量％が好ましい。30重量％未満では体積比で
50％未満に相当し、焼結阻害効果が小さい。ま
た、70％重量％を越えると黒鉛粉末どうしが凝集
し均質な被膜が得られない。
また、溶融金属容器の使用中に流し込み耐火材
層が溶損または剥離により消失した際にも、溶融
金属に対する漏れ難さの点から黒鉛を含有した被
膜層を形成せしめておくことによつて、永久張炉
材層の溶損を軽減できる効果をも期待できる。
塗布剤の施工に関しては吹付けおよび塗り込み
等の方法があるが、どのような方法で行なつても
良い。この他に被膜の効果を高めるために、塗布
後加熱処理を行なつても良い。
塗布剤の塗布厚みとしては１〜５mmが適当であ
る。１mm未満では目的とする効果が得られない
し、逆に５mmより厚くすると塗布剤自体の強度保
持が出来なくなり、自重で崩れ落ちたり、剥落し
たりする。
流し込み材の施工、乾燥昇温過程で、含水分の
移動を防止する方法としては、ペイント、グリー
スに代表される非含水有機塩のペーストを塗布す
る方法やリン酸塩、水ガラス等の無機塩を塗布す
る方法が考えられる。しかし塗布被膜が有機塩の
ものでは200℃付近の温度で気化し、それ以上の
温度域で生じる流し込み耐火材と永久張炉材層の
焼結反応を防止することは困難である。
＜実施例＞
本発明の実施例を具体的に以下に示す。
本発明に係るペーストＡ，Ｂを用いて255t溶鋼
取鍋のろう石質（SiO277.6％、Al2O321％）の永
久張炉材層表面に塗膜を形成し、内張りにセミジ
ルコン質（ZrO242％、SiO256％）耐火材の流し
込み施工を行ない、比較例Ｃ〜Ｆとともにその結
果を第１表に示す。使用後の剥離性は約100ヒー
ト使用後、、ブレーカーで残存内張流し込み耐火
材層を解体する際の剥離の容易性で示す。
第２図にペーストＡの施工面積と使用後の内張
流し込み耐火材層解体に要した時間との関係を示
した。ペーストの使用面積を拡大することによ
り、残存内張流し込み材層の解体時間が大巾に短
縮することが認められた。
第３図にペーストＡの塗布面積と解体後の永久
張レンガの積み替え重量との関係を示した。永久
張レンガの使用期間と、永久張レンガのの気孔率
との関係を本発明に係るペーストの塗布有無に層
別して第４図に示した。
<Industrial Application Field> The present invention relates to a method for protecting permanently stretched furnace materials of molten metal containers such as ladles and tundishes. <Prior Art> In recent years, pour-in refractory materials have been increasingly used as furnace lining materials for molten metal containers such as ladles and tundishes, from the viewpoint of ease of construction and reduction in furnace material costs. When a poured refractory material is used as a lining material for a molten metal container, when it dries, water in the poured refractory material permeates into the permanent cast material layer and binder components such as SiO 2 and Na 2 O are released. Moving. For this reason, when the temperature of the molten metal container rises, these moving components soften and melt, resulting in strong adhesion between the permanent casting material layer and the pouring material layer, and the vaporization of penetrating moisture causes tissue destruction of the permanent casting material layer. . For these reasons, there is a concern that leakage of molten metal may occur due to deterioration of the permanent furnace material layer at the end of each cycle of use of the molten metal container. Because it is adhesive, when dismantling the remaining pouring material layer after use,
This causes problems such as partial damage and peeling of the permanent tensioning material layer, and an increase in the amount of reshipping of the permanent tensioning material layer. As a technique to prevent such adhesion between the poured lining refractory material and the permanent refractory material layer, a method of applying a slurry consisting of organic fibers and refractory powder (Japanese Patent Laid-Open No. 53
-137028), but since this method uses refractory powder, water and dispersants (ponovyl, alcohol, starch paste) are vaporized and burned in a relatively low temperature range. It is not possible to prevent a partial sintering reaction between the poured refractory material and the permanent furnace material layer. Further, if a material containing a low melting substance is used as the refractory powder, the above-mentioned sintering reaction will be further promoted. Furthermore, since the above method uses water as a medium for forming a slurry, there is a risk of tissue destruction due to vaporization of moisture that has permeated into the permanent casting material layer. <Problems to be Solved by the Invention> The present invention solves the problems of the prior art as described above, and effectively prevents adhesion and fusion between the poured lining refractory material and the permanent cast refractory material layer. A molten metal permanent furnace material that can reduce the amount of reloading of permanent furnace materials, prevent moisture movement from the lining poured refractory material to the permanent furnace material layer, and prevent structural deterioration of the permanent furnace material layer. This was done to provide a method of protecting the layer. <Means for Solving the Problems> The present inventor has made efforts to prevent adhesion and fusion between the lining cast material and the permanent tension material, and to prevent moisture movement from the lining cast material to the permanent tension material. As a result of repeated research, it was discovered that the objective could be achieved by applying a paste made by combining inorganic salt and graphite powder in a specific ratio between the two, and based on this knowledge, the present invention was developed. I arrived at the eggplant. The present invention provides a molten metal container in which a refractory material is poured as a lining material on the surface of a permanent furnace material layer, and the surface of the permanent furnace material layer is made of an inorganic salt containing 30 to 70% by weight of graphite powder. 1 paste
This is a method for protecting a permanently cast furnace material for a molten metal container, characterized in that the coating is applied to a thickness of 5 mm. <Operation> FIG. 1 shows a sectional view of an embodiment of the present invention. A permanent furnace material layer 2 is lined on the inner surface of the iron shell 1 of the molten steel ladle, and a paste coating layer 3 made of an inorganic salt containing graphite is applied between it and the lining poured refractory material layer 4. After installing the poured refractory material 4, during the drying and heating process, most of the water in the poured material layer 4 evaporates toward the inside of the furnace, that is, in the direction shown by the arrow in the figure, but near the back (permanent furnace material layer side) At the same time, components such as SiO 2 and Na 2 O tend to migrate to the permanently tensioned part. In order to prevent these migrations, the paste coating layer 3 needs to be a dense coating layer that is stable up to the temperature range (approximately 200°C or higher) where water evaporation is completely completed, and inorganic salts are preferred over organic salts. It is preferable to consist of: In addition, inorganic salt alone softens and melts in a high temperature range of 500°C or higher, promoting the sintering reaction. It is effective to include graphite powder in the coating agent (paste) in order to prevent sintering between the cast material and the permanently cast material in a high temperature range. The amount starts from 30% by weight
70% by weight is preferred. If less than 30% by weight, by volume
This corresponds to less than 50%, and the sintering inhibition effect is small. Moreover, if it exceeds 70% by weight, the graphite powders will aggregate and a homogeneous coating will not be obtained. In addition, even if the poured refractory material layer disappears due to melting damage or peeling during use of the molten metal container, a coating layer containing graphite is formed to prevent leakage of the molten metal. It can also be expected to have the effect of reducing erosion of the permanent furnace material layer. Regarding the application of the coating agent, there are methods such as spraying and painting, but any method may be used. In addition to this, in order to enhance the effect of the coating, heat treatment may be performed after coating. The appropriate coating thickness of the coating agent is 1 to 5 mm. If it is less than 1 mm, the desired effect will not be obtained, and if it is thicker than 5 mm, the coating agent itself will not be able to maintain its strength and will collapse or peel off under its own weight. Methods to prevent the movement of moisture during the construction of pouring materials and during the drying and heating process include applying a paste of non-hydrous organic salts such as paint and grease, or using inorganic salts such as phosphates and water glass. One possible method is to apply it. However, if the applied coating is an organic salt, it will vaporize at a temperature around 200°C, and it is difficult to prevent the sintering reaction between the poured refractory material and the permanent cast material layer that occurs in a temperature range higher than that. <Example> Examples of the present invention are specifically shown below. Using pastes A and B according to the present invention, a coating film was formed on the surface of the permanent furnace material layer of dololithic (SiO 2 77.6%, Al 2 O 3 21%) of a 255t molten steel ladle, and semizirconite was added to the inner lining. (ZrO 2 42%, SiO 2 56%) Refractory material was poured and the results are shown in Table 1 along with Comparative Examples C to F. The peelability after use is determined by the ease with which the remaining lining refractory layer can be peeled off using a breaker after approximately 100 heats. Figure 2 shows the relationship between the area where Paste A was applied and the time required to pour the lining and dismantle the refractory layer after use. It was found that by expanding the area in which the paste was used, the time required to dismantle the remaining lining pouring material layer was significantly reduced. Figure 3 shows the relationship between the area of application of paste A and the weight of reloading the permanently clad bricks after dismantling. The relationship between the period of use of the permanent brick and the porosity of the permanent brick is shown in FIG. 4, stratified according to whether the paste of the present invention was applied or not.
【表】
本発明に係るペーストを塗布することによつて
内張に流し込み耐火材中の水分の移動に起因する
永久張レンガ層の劣化、即ち高気孔率化の防止効
果および内張り流し込み耐火材と永久張レンガ層
との焼結に起因する内張り流し込み材層の解体時
の永久張レンガ層の破損量の大巾な減少が認めら
れた。
＜発明の効果＞
本発明は、内張り炉材として流し込み耐火材料
を使用する溶融金属容器において、以下のような
すぐれた効果を奏する。
(1) 永久張炉材層への内張り流し込み耐火材料か
らの水分の浸透による永久張炉材層の気孔率上
昇等の組織劣化を防止でき、永久張炉材層の寿
命が延長する。
(2) 内張り流し込み耐火材層と永久張炉材層との
固着焼結が防止され、残存内張り流し込み耐火
材層の解体除去が容易に短時間に行え、かつ永
久張炉材層の積み替え量が著しく減少する。
(3) 内張り流し込み耐火材層使末期の内張り耐火
材層の溶損、剥落による永久張炉材表面層への
溶融金属の接触にともなう永久張炉材層の溶
損、変質を防止できる。
以上により、溶融金属容器の永久張炉材費及び
その施工費が大巾に節減できる。[Table] By applying the paste of the present invention, the effect of preventing the deterioration of the permanent brick layer, that is, the increase in porosity caused by the movement of moisture in the lining refractory material, and the effect of applying the paste of the present invention on the lining refractory material. A significant reduction in the amount of damage to the permanent brick layer during dismantling of the lining poured material layer due to sintering with the permanent brick layer was observed. <Effects of the Invention> The present invention provides the following excellent effects in a molten metal container using a poured refractory material as a lining furnace material. (1) It is possible to prevent structural deterioration such as an increase in the porosity of the permanent furnace material layer due to moisture infiltration from the refractory material poured into the permanent furnace material layer, thereby extending the life of the permanent furnace material layer. (2) Sintering of the cast lining refractory material layer and the permanent furnace material layer is prevented, the remaining cast lining refractory material layer can be easily dismantled and removed in a short time, and the amount of reshipment of the permanent furnace material layer is reduced. significantly reduced. (3) Pouring lining refractory material layer Erosion and deterioration of the permanent furnace material layer due to contact of molten metal to the surface layer of the permanent furnace material due to erosion and peeling of the lining refractory material layer at the end of use can be prevented. As a result of the above, the cost of permanent furnace material for the molten metal container and its construction cost can be significantly reduced.
第１図は、本発明の一実施例の断面図、第２図
は、ペースト塗布面積と内張り流し込み耐火材解
体時間との関係を示すグラフ、第３図はペースト
の塗布面積と永久張炉材積み替え量との関係を示
すグラフ、第４図は、永久張炉材の使用時間と気
孔率との関係を示すグラフである。
１……溶鋼取鍋の鉄皮、２……永久張炉材層、
３……ペースト塗布層、４……内張り流し込み耐
火材層、５……内張り敷部レンガ層。
Fig. 1 is a cross-sectional view of an embodiment of the present invention, Fig. 2 is a graph showing the relationship between the paste application area and the lining pouring refractory dismantling time, and Fig. 3 is a graph showing the relationship between the paste application area and the permanent cast refractory material. FIG. 4 is a graph showing the relationship between the amount of transshipment and the porosity of the permanently stretched furnace material. 1... Steel skin of molten steel ladle, 2... Permanent tension furnace material layer,
3... Paste coating layer, 4... Lining poured refractory material layer, 5... Lining bed brick layer.
Claims (1)
込み耐火材料を使用する溶融金属容器において、
永久張炉材層の表面に30〜70重量％の黒鉛粉末を
含有する無機塩からなるペーストを１〜５mmの厚
みで塗布することを特徴とする溶融金属容器の永
久張炉材の保護方法。1. In a molten metal container in which a refractory material is poured as a lining material on the surface of a permanent furnace material layer,
A method for protecting a permanent tensioning material for a molten metal container, which comprises applying a paste made of an inorganic salt containing 30 to 70% by weight of graphite powder to a thickness of 1 to 5 mm on the surface of the permanent tensioning material layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27905487A JPH01122659A (en) | 1987-11-06 | 1987-11-06 | Protection of permanent lining internal insulation of molten metal container |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27905487A JPH01122659A (en) | 1987-11-06 | 1987-11-06 | Protection of permanent lining internal insulation of molten metal container |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01122659A JPH01122659A (en) | 1989-05-15 |
| JPH0320302B2 true JPH0320302B2 (en) | 1991-03-19 |
Family
ID=17605755
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27905487A Granted JPH01122659A (en) | 1987-11-06 | 1987-11-06 | Protection of permanent lining internal insulation of molten metal container |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01122659A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2755891B2 (en) * | 1993-06-24 | 1998-05-25 | 川崎製鉄株式会社 | Repair method for refractory lining of molten metal container |
| CN103785820B (en) * | 2014-02-17 | 2016-02-10 | 莱芜钢铁集团有限公司 | A kind of ladle permanent liner and preparation method thereof |
| CN106623883A (en) * | 2016-12-14 | 2017-05-10 | 山东钢铁股份有限公司 | Integral pouring process for large steel ladle |
-
1987
- 1987-11-06 JP JP27905487A patent/JPH01122659A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01122659A (en) | 1989-05-15 |
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