JP2930679B2 - Vacuum degassing furnace Refractory for press-fitting for inner circumference repair - Google Patents
Vacuum degassing furnace Refractory for press-fitting for inner circumference repairInfo
- Publication number
- JP2930679B2 JP2930679B2 JP2195939A JP19593990A JP2930679B2 JP 2930679 B2 JP2930679 B2 JP 2930679B2 JP 2195939 A JP2195939 A JP 2195939A JP 19593990 A JP19593990 A JP 19593990A JP 2930679 B2 JP2930679 B2 JP 2930679B2
- Authority
- JP
- Japan
- Prior art keywords
- press
- fitting
- alumina
- vacuum degassing
- repair
- 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 - Fee Related
Links
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
- Ceramic Products (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、真空脱ガス炉スノーケル内周の補修に使用
する圧入施工用耐火物に関する。Description: TECHNICAL FIELD The present invention relates to a press-fitting refractory used for repairing the inner periphery of a vacuum degassing furnace snorkel.
［従来の技術］ DH式・RH式などの真空脱ガス炉の下端に備えられるス
ノーケル（環流管、吸い上げ管あるいは浸漬管）は、溶
鋼の流通によって内周面の損傷が著しい。そこで、この
溶損部位を随時補修することが行われている。[Prior art] The inner peripheral surface of a snorkel (reflux pipe, suction pipe or immersion pipe) provided at the lower end of a vacuum degassing furnace such as a DH type or RH type is significantly damaged by the flow of molten steel. Therefore, the erosion site is repaired at any time.
スノーケルの補修方法の一つに圧入施工がある。この
圧入施工に使用される耐火物（以下、圧入材と称する）
の材質として、骨材をマグネシアにした塩基性質が提案
されている。例えば特開昭58−104071号公報、特開昭58
−151373号公報に見られるとおりである。One of the repair methods for snorkels is press-fitting. Refractory used for this press-fitting work (hereinafter referred to as press-fitting material)
As a material of the material, a basic property in which an aggregate is made of magnesia has been proposed. For example, JP-A-58-1004071, JP-A-58-14071
-151373.
［発明が解決しようとする課題］ 塩基性質は耐食性に優れているが、反面、施工水分と
の反応で消化する欠点がある。また、耐スポーリング性
に劣る。真空脱ガス炉スノーケルの圧入補修は、一般に
炉の稼働率向上のために熱間施工が行われているが、そ
の際の高温雰囲気と熱衝撃によって、塩基性質の圧入材
に対する消化とスポーリングが一段と生じやすい条件と
なっており、上記のような欠点が大きな問題となってい
る。[Problems to be Solved by the Invention] Although the basic property is excellent in corrosion resistance, it has a drawback that it is digested by reaction with construction moisture. Also, it is inferior in spalling resistance. In general, hot work is performed to improve the operation rate of the furnace for the press-fitting repair of the vacuum degassing furnace snorkel. Conditions are more likely to occur, and the above-mentioned drawbacks are a major problem.
本発明は、塩基性質の圧入材がもつ上記従来の欠点を
解消することを目的とする。An object of the present invention is to eliminate the above-mentioned conventional disadvantages of the press-fitting material having a basic property.
［課題を解決するための手段］ 本発明の特徴とするところは、重量割合でマグネシア
骨材35〜80％、焼結又は電融のアルミナ骨材10〜30％、
平均粒子径0.3〜８μｍの仮焼アルミナ５〜20％、アル
ミナセメント３〜15％および適量の分散剤よりなる真空
脱ガス炉スノーケル内周補修溶圧入施工用耐火物であ
る。[Means for Solving the Problems] The feature of the present invention is that magnesia aggregate is 35 to 80% by weight, sintered or fused alumina aggregate is 10 to 30%,
This is a refractory for repairing and press-fitting the inside circumference of a vacuum degassing furnace snorkel comprising 5 to 20% of calcined alumina having an average particle diameter of 0.3 to 8 µm, 3 to 15% of alumina cement, and an appropriate amount of a dispersant.
塩基性材質の消化防止剤として従来からシリカ、鉄、
ほう砂などが知られている。しかし、これらの物質は低
融物を生成しやすいので、消化防止の効果を得るだけの
量を添加すると耐食性が低下してしまう。これに対し本
発明者等は、種々研究・試験を行った結果、仮焼アルミ
ナの添加によって消化を防止し、前述のような課題を有
利に解決できることを知見し、本発明を完成するに到っ
たものである。Conventionally, silica, iron,
Borax is known. However, these substances tend to form low melts, so that if they are added in an amount sufficient to obtain the effect of preventing digestion, the corrosion resistance will be reduced. On the other hand, the present inventors have conducted various studies and tests, and as a result, have found that addition of calcined alumina prevents digestion and can advantageously solve the above-described problems, and have completed the present invention. It is a thing.
バイヤー法で得られた水酸化アルミニウムを500〜150
0℃の比較的低温で焼成して得られる平均粒子径10μｍ
以下の仮焼アルミナは、焼結されていないことで粒子が
微細であり、圧入材の粒度の中で微粉部分を構成し、流
動性、充填性に寄与するが、マグネシアなどと違って微
粒子であっても消化の問題がない。しかも、超微粉であ
ることで骨材のマグネシア粒子の表面を覆い、よって粗
粒のマグネシア粒子の消化防止にも効果があるものと考
えられる。500-150 aluminum hydroxide obtained by Bayer method
Average particle size 10μm obtained by firing at a relatively low temperature of 0 ° C
The following calcined alumina has fine particles because it is not sintered, and constitutes a fine powder portion in the particle size of the press-fitting material, contributing to fluidity and fillability, but unlike magnesia etc., it is a fine particle There is no digestion problem. In addition, it is considered that the ultrafine powder covers the surface of the magnesia particles of the aggregate, and thus is also effective in preventing digestion of coarse magnesia particles.
次に、塩基性質の圧入材は、熱衝撃によるスポーリン
グに加え、過焼結による残存収縮によってもキレツが発
生しやすい。本発明では骨材としてマグネシアとアルミ
ナとを併用することにより、使用中の高温でMgO＋Al2O3
→MgO・Al2O3の反応でスピネルが生じ、その残存膨張性
でキレツを防止することができる。また、スポーリング
によってキレツが生じた場合でも、残存膨張による補修
組織の迫り合いで剥落を防止できるものである。Next, in a press-fitting material having a basic property, in addition to spalling due to thermal shock, sharpness is likely to occur due to residual shrinkage due to oversintering. In the present invention, by using magnesia and alumina in combination as an aggregate, MgO + Al 2 O 3
→ Spinel is generated by the reaction of MgO · Al 2 O 3 , and its residual swelling property can prevent cracking. Further, even if a crack occurs due to spalling, it can be prevented from peeling off due to the approach of the repaired tissue due to residual expansion.
さらに、本発明においては、平均粒子径0.3〜８μｍ
の仮焼アルミナの添加により、消化防止だけでなく、仮
焼アルミナ粒子が活性でしかも微細なために骨材のマグ
ネシアとアルミナとの間に介在し、スピネルの生成を促
進し、前記の残存膨張性による効果を顕著なものにする
のである。Furthermore, in the present invention, the average particle diameter is 0.3 to 8 μm
The addition of calcined alumina not only prevents digestion, but also calcined alumina particles are active and fine, so they are interposed between magnesia and alumina as aggregates, promoting the formation of spinel, and the residual expansion. The effect of gender is remarkable.
以下、本発明で使用する配合物とその割合について、
さらに詳細に説明する。なお、以下に示す配合割合は、
すべて重量割合である。Hereinafter, the compounds used in the present invention and the ratio thereof,
This will be described in more detail. In addition, the compounding ratio shown below is
All are percentages by weight.
マグネシア骨材は耐食性付与の効果をもつ。焼結品、
電融品のいずれでも使用できる。本発明においては、そ
の割合が35％未満では耐食性に劣り、80％を超えると耐
スポーリング性に劣るため、35〜80％の範囲とした。Magnesia aggregate has the effect of imparting corrosion resistance. Sintered products,
Any of the electrofused products can be used. In the present invention, if the proportion is less than 35%, the corrosion resistance is poor, and if it exceeds 80%, the spalling resistance is poor, so the range is 35 to 80%.
アルミナ骨材についても焼結品、電融品のいずれでも
使用できる。アルミナ骨材は全温度域において安定であ
り、耐スポーリング性の効果をもつ。また、使用中には
マグネシア骨材との反応でスピネルを生成し、残存膨張
性を付与する。本発明においては、その割合が10％未満
では耐スポーリング性および残存膨張性に劣り、30％を
超えると耐食性に劣るため、10〜30％の範囲とした。As for the alumina aggregate, either a sintered product or an electrofused product can be used. Alumina aggregate is stable in all temperature ranges and has an effect of spalling resistance. In addition, during use, spinel is formed by a reaction with magnesia aggregate to provide residual expandability. In the present invention, if the proportion is less than 10%, the spalling resistance and the residual swelling property are inferior, and if it exceeds 30%, the corrosion resistance is inferior.
骨材材質は以上のマグネシアおよびアルミナを使用す
ることが必須であるが、本発明の効果を損なわない範囲
であれば、骨材としてさらにボーキサイト、ばん土頁
岩、シリマナイト、カイヤナイト、ムライト、ろう石、
けい石、溶融シリカ、スピネル、クロム鉱、炭化珪素、
窒化珪素、石炭石、ジルコンなどから選ばれる１種また
は２種以上を適量組み合わせてもよい。It is essential to use the above magnesia and alumina as the aggregate material, but as long as the effects of the present invention are not impaired, bauxite, sand shale, sillimanite, kyanite, mullite, and limestone are further used as aggregates. ,
Silica, fused silica, spinel, chromite, silicon carbide,
One or two or more selected from silicon nitride, coal stone, zircon and the like may be combined in an appropriate amount.
本発明において、平均粒子径10μｍ以下の仮焼アルミ
ナは流動性、耐消化性および残存膨張性に効果をもつ。
その割合が５％未満ではこの効果がなく、20％を超える
と微粒全体の割合が多くなって耐食性に劣るため、５〜
20％の範囲でなければならない。さらに好ましい範囲
は、７〜15％である。In the present invention, calcined alumina having an average particle size of 10 μm or less has effects on fluidity, digestion resistance and residual swelling property.
If the proportion is less than 5%, this effect is not obtained, and if it exceeds 20%, the proportion of the whole fine particles increases and the corrosion resistance is inferior.
Must be in the range of 20%. A more preferred range is 7 to 15%.
本発明で使用する仮焼アルミナは平均粒子径0.3〜８
μｍのものを使用する。平均粒子径が８μｍを超えると
スピネル生成の効果に劣り、残存膨張性も低下すること
となる。The calcined alumina used in the present invention has an average particle size of 0.3 to 8
Use a μm one. If the average particle size exceeds 8 μm, the effect of spinel formation is inferior, and the residual swelling property also decreases.
アルミナセメントは結合剤としての役割をもつ。その
割合が３％未満では施工後の強度がなく、15％を超える
と耐食性が低下する。さらに好ましい範囲は、５〜10％
である。Alumina cement has a role as a binder. If the proportion is less than 3%, there is no strength after construction, and if it exceeds 15%, the corrosion resistance is reduced. A more preferable range is 5 to 10%.
It is.
分散剤は、施工時に低水量での流動性を付与する効果
をもつ。従来公知の例えば、アルカリ金属リン酸塩、ア
ルカリ金属ケイ酸塩、アルカリ金属カルボン酸塩、アル
カリ金属フミン酸塩、アルキルスルフォン酸ナトリウ
ム、芳香族スルフォン酸ナトリウムなどから選ばれる１
種または２種以上が使用できる。その割合は、前記配合
物の総量に対する外掛けで0.01〜１％が好ましい。The dispersant has an effect of imparting fluidity with a low amount of water during construction. Conventionally known, for example, 1 selected from alkali metal phosphate, alkali metal silicate, alkali metal carboxylate, alkali metal humate, sodium alkyl sulfonate, sodium aromatic sulfonate, etc.
Species or two or more can be used. The ratio is preferably 0.01 to 1% on the basis of the total amount of the blend.
また上記のほかにも、この種の圧入材の添加物として
公知の、例えば炭素粉、金属粉、ファイバー類、粘土な
どを適当量添加してもよい。In addition to the above, known amounts of additives such as carbon powder, metal powder, fibers, clay, and the like may be added in appropriate amounts.
以上からなる圧入材は施工において、施工水分を添加
し、混練後、圧入ポンプにて被施工部に圧入充填され
る。The press-fitting material composed as described above is subjected to press-fitting into a portion to be processed by a press-fitting pump after adding working moisture and kneading.
［実 施 例］ 以下、本発明の実施例とその比較例を示す。[Examples] Examples of the present invention and comparative examples are shown below.
表は、圧入材各例の配合組成と試験結果である。試験
方法はつぎのとおり。The table shows the composition and test results of each example of the press-fitting material. The test method is as follows.
各例はいずれも施工水分を外掛け10wt％添加し、混練
後、圧入充填した。気孔率・圧縮強さ・残存膨張性は、
内寸法がタテ400×ヨコ1000×深さ1000mmの鉄製容器の
側面に50mmφの透孔を設け、この透孔を通して圧入材10
00kgを1000kg/分で圧入し、硬化後の成形体から試験片
を切り出して測定した。In each case, the applied moisture was added over the outside by 10 wt%, kneaded, and then press-fitted and filled. Porosity, compressive strength and residual expansion
A 50mmφ through hole is provided on the side of an iron container with an inner dimension of 400 × width 1000 × 1000mm in depth.
00 kg was press-fitted at 1000 kg / min, and a test piece was cut out from the cured compact to measure.
気孔率;JIS−R12345に準じて測定した。Porosity: Measured according to JIS-R12345.
圧縮強さ;JIS−R54321に準じて測定した。Compressive strength; measured according to JIS-R54321.
残存膨張性；タテ40×ヨコ40×長さ160mmの試験片を150
0℃×2hr加熱後、試験片の長さ方向の残存膨張率を求め
た。Residual swellability: 150 vertical × 40 horizontal × 160 mm long test pieces
After heating at 0 ° C for 2 hours, the residual expansion rate in the length direction of the test piece was determined.
耐消化性；タテ40×ヨコ40×長さ160mmの試験片を152℃
５気圧の水蒸気下で3hr保定し耐消化性の良否を確認し
た。Digestion resistance; length 40 × width 40 × length 160mm test piece at 152 ℃
It was kept for 3 hours under steam of 5 atm, and the quality of digestion resistance was confirmed.
実機試験は、250屯のRH式真空脱ガス炉のスノーケル
の内周面に熱間補修して測定したものである。使用後、
内面温度が約1200℃のスノーケルにその下方から耐火物
製の中子を挿入し、その中子の側面に設けた透孔を通
し、スノーケルの内周と前記中子との間に圧入材を充填
した。補修後、中子はそのまま残して炉を稼働させた。The actual test was conducted by hot-repairing the inner surface of the snorkel of a 250-ton vacuum degassing furnace. after use,
Insert a refractory core into the snorkel whose inner surface temperature is about 1200 ° C from below, pass through a through hole provided on the side surface of the core, and insert a press-fit material between the inner periphery of the snorkel and the core. Filled. After the repair, the core was left running and the furnace was operated.
施工性；圧入時の流動性の良否を観察した。Workability: The flowability at the time of press-fitting was observed.
耐用性；補修後の耐用チャージ数を測定した。Service life: The number of service charges after repair was measured.
表に示すように本発明の実施例はいずれも残存膨張性
が大きく、しかも耐消化性に優れており、その結果、実
機試験における施工性および耐用性にも優れていること
が分かる。 As shown in the table, all of the examples of the present invention have large residual swelling properties and are excellent in digestion resistance, and as a result, it is understood that they are also excellent in workability and durability in actual machine tests.
これに対し骨材のマグネシアが少なくてアルミナが多
いと比較例１と仮焼アルミナの割合が多すぎる比較例４
は、耐食性に劣るためか実機試験において耐用性が不充
分となっている。仮焼アルミナが配合されていない比較
例２、仮焼アルミナの割合が少ない比較例３、焼結アル
ミナ超微粉を配合した比較例５、平均粒径が大きい仮焼
アルミナを使用した比較例６は、残存膨張性および耐消
化性に劣ることが確認された。On the other hand, when the amount of magnesia in the aggregate was small and the amount of alumina was large, Comparative Example 1 and Comparative Example 4 in which the proportion of calcined alumina was too large
Is inadequate in the actual machine test probably because of poor corrosion resistance. Comparative Example 2 in which calcined alumina was not blended, Comparative Example 3 in which the proportion of calcined alumina was small, Comparative Example 5 in which sintered alumina ultrafine powder was blended, and Comparative Example 6 in which calcined alumina having a large average particle size was used were: It was confirmed that the residual swelling property and the digestion resistance were inferior.
［発明の効果］ 以上のとおり、本発明による圧入材は残存膨張性と耐
消化性によって耐スポーリング性の向上、剥離防止の効
果により、塩基性材質がもつ耐食性をいかんなく発揮す
ることができる。とりわけ、熱間施工の場合におけるニ
ーズに答えた本発明圧入材の効果は大きく、その実用上
の価値は極めて大なるものである。[Effects of the Invention] As described above, the press-fitting material according to the present invention can fully exhibit the corrosion resistance of a basic material due to the effect of improving spalling resistance due to residual expansion and digestion resistance and preventing peeling. . In particular, the effect of the press-fitting material of the present invention, which responds to needs in the case of hot working, is great, and its practical value is extremely large.
Claims (2)
ルミナ骨材10〜30％、平均粒子径0.3〜８μｍの仮焼ア
ルミナ５〜20％、アルミナセメント３〜15％および適量
の分散剤よりなる真空脱ガス炉スノーケル内周補修用圧
入施工用耐火物。1. Magnesia aggregate: 35 to 80%, alumina aggregate: 10 to 30%, calcined alumina having an average particle diameter of 0.3 to 8 μm, 5 to 20%, alumina cement: 3 to 15%, and an appropriate amount of dispersion by weight. Refractory for press-fitting for repairing the inner circumference of a vacuum degassing furnace snorkel made of chemicals.
ある請求項１記載の真空脱ガス炉スノーケル内周補修用
圧入施工用耐火物。2. The refractory according to claim 1, wherein the calcined alumina has a firing temperature of 500 to 1500 ° C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2195939A JP2930679B2 (en) | 1990-07-24 | 1990-07-24 | Vacuum degassing furnace Refractory for press-fitting for inner circumference repair |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2195939A JP2930679B2 (en) | 1990-07-24 | 1990-07-24 | Vacuum degassing furnace Refractory for press-fitting for inner circumference repair |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0483762A JPH0483762A (en) | 1992-03-17 |
| JP2930679B2 true JP2930679B2 (en) | 1999-08-03 |
Family
ID=16349487
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2195939A Expired - Fee Related JP2930679B2 (en) | 1990-07-24 | 1990-07-24 | Vacuum degassing furnace Refractory for press-fitting for inner circumference repair |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2930679B2 (en) |
-
1990
- 1990-07-24 JP JP2195939A patent/JP2930679B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0483762A (en) | 1992-03-17 |
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