JPH0631681B2 - Vacuum degasser - Google Patents
Vacuum degasserInfo
- Publication number
- JPH0631681B2 JPH0631681B2 JP61096871A JP9687186A JPH0631681B2 JP H0631681 B2 JPH0631681 B2 JP H0631681B2 JP 61096871 A JP61096871 A JP 61096871A JP 9687186 A JP9687186 A JP 9687186A JP H0631681 B2 JPH0631681 B2 JP H0631681B2
- Authority
- JP
- Japan
- Prior art keywords
- mgo
- brick
- board
- bricks
- vacuum
- 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)
Description
【発明の詳細な説明】 産業上の利用分野 本発明はMgO−Ｃれんが背面部に充填材を配設した真空
脱ガス装置に関する。TECHNICAL FIELD The present invention relates to a vacuum degassing apparatus in which a filler is provided on the back surface of an MgO-C brick.
従来の技術 溶鋼の真空脱ガス装置としてＲＨ（Rheinstall−Herau
s）式真空脱ガス装置が汎用されているが、このＲＨ式
装置の真空容器槽の内張りれんがとしてMgO−Ｃれんが
を使用すると、MgO−Ｃれんが背面から著しい酸化が進
行することが知られている。前記真空容器は操業時0.1
〜200トールの真空状態とされるので、MgO−Ｃれんが背
面から酸化されることは、全く予想されなかった現象で
ある。特に真空容器の下部槽と還流管（上昇管、下降
管、浸漬管又は吸上管）との結合部付近の真空シールが
破れ易く、この場合シール部から侵入した空気が内張り
れんがの背面を通り真空排気装置から排出されることが
判明した。装置使用中に高温に達したMgO−Ｃれんがの
背面を通過する空気は、れんがの主成分である炭素を著
しく酸化させるものであり、この酸化反応が甚しい場合
はMgO−Ｃれんがの背面から100mm以上も酸化され、該酸
化部は炭素の消失によりれんが強度は殆んどなくなり、
耐火物構造体を維持できなくなり、耐火物構造体の破壊
を招き耐用向上への一大欠陥となっている。Conventional technology As a vacuum degassing device for molten steel, RH (Rheinstall-Herau
s) type vacuum degassing equipment is widely used, but it is known that when MgO-C brick is used as the lining brick in the vacuum vessel of this RH type equipment, significant oxidation progresses from the back of the MgO-C brick. There is. The vacuum vessel is in operation 0.1
Oxidation of MgO-C bricks from the back side is a phenomenon which was not expected at all, because the vacuum state is set to -200 torr. In particular, the vacuum seal near the joint between the lower tank of the vacuum container and the reflux pipe (upcome pipe, downcomer pipe, dip pipe or suction pipe) is easy to break. It was found to be discharged from the vacuum exhaust device. The air passing through the back surface of the MgO-C brick that has reached a high temperature during the use of the device significantly oxidizes carbon, which is the main component of the brick, and when the oxidation reaction is severe, the air from the back surface of the MgO-C brick is Oxidation of 100 mm or more, the oxidized part has almost no brick strength due to the disappearance of carbon,
It becomes impossible to maintain the refractory structure, which leads to the destruction of the refractory structure, which is a major defect in improving the durability.
また、本出願人の一人がさきに出願した特開昭53−1066
36号公報には、裏張りにクッション性材料を用いた鋳込
容器が開示されている。Moreover, one of the applicants previously filed Japanese Patent Application Laid-Open No. 53-1066.
Japanese Patent No. 36 discloses a casting container using a cushioning material for the lining.
発明が解決しようとする課題 現在、ＲＨ式装置の内張りれんがは直接結合マグ・クロ
れんがが主に使用されている。MgO−Ｃれんがは前述の
ような諸問題があるために使用されていない。DISCLOSURE OF INVENTION Problems to be Solved by the Invention Currently, direct-bonded mag-chromic bricks are mainly used as lining bricks of RH type devices. MgO-C bricks are not used because of the problems mentioned above.
１）直接結合マグ・クロれんがのライニングの場合、背
面を空気が流れても重大な問題とはならない。従って、
れんが背面にはれんがの膨張吸収を目的とする充填材を
充填しているが、この充填材としてはMgO粉60重量％に
オガ屑40重量％を混合したものが使用されている。前述
の如く、膨張吸収が目的であるため、その他の点を特に
考慮した材料は使われていない。直接結合マグ・クロれ
んがの場合、このような充填材を背面に詰めるだけで十
分な効果が得られる。1) In the case of lining of direct-bonded mag-chromic bricks, even if air flows through the back side, it does not cause a serious problem. Therefore,
The back of the brick is filled with a filler for the purpose of expanding and absorbing the brick. As the filler, a mixture of 60% by weight of MgO powder and 40% by weight of sawdust is used. As described above, since the purpose is expansion and absorption, a material that takes other points into consideration is not used. In the case of direct-bonded mag-black brick, it is sufficient to fill the backside with such a filling material.
２）MgO−Ｃれんがの場合、直接結合マグ・クロれんが
と同等の施工を行なうと、次のような問題が発生し背面
の酸化を防止することはできない： 使用中にオガ屑が焼失し、気孔率が大きくなり空気
の流通を抑制できない。2) In the case of MgO-C bricks, if the same construction as that of direct-bonded mag-chrome bricks is performed, the following problems occur and it is not possible to prevent oxidation on the back surface: Ogre scraps burn out during use, Porosity increases and air flow cannot be suppressed.
オガ屑焼失後は強度がないため、MgO粉のみが次第
に降下し、背面が空洞化し空気がよく流れる。Since the MgO powder does not have enough strength after burning off the waste slag, only the MgO powder gradually drops, the back surface becomes hollow and air flows well.
材料の性質上、内張りれんがを数段施工する毎にあ
とかられんが背面に充填材を流下充填するので、れんが
の密着施工がむずかしい。Due to the nature of the material, it is difficult to adhere the bricks because the filling material is filled down on the back surface of the bricks every time the inner bricks are installed several times.
以上の如き諸欠点を解決するため、オガ屑を混ぜないMg
O粉のみの充填を実施したが、酸化防止の効果は得られ
ないことが判明した。In order to solve the above-mentioned drawbacks, Mg that does not mix sawdust
Although only O powder was filled, it was found that no antioxidant effect was obtained.
一方、MgO−Ｃれんが背面への酸化防止材料の塗布も実
施したが、れんが背面からの剥落及び目地部からの酸化
が発生し十分な効果が得られないことも認められた。On the other hand, although an antioxidant material was applied to the back surface of the MgO-C brick, it was also confirmed that the brick was peeled off from the back surface and oxidized from the joints, and a sufficient effect could not be obtained.
課題を解決するための手段 本発明者等は前述した如き経験を踏まえ、種々検討の結
果本発明真空脱ガス装置の開発に成功したものであり、
本発明の技術的構成は前記特許請求の範囲に明記したと
おりであるが、以下にその詳細を説明する。Means for Solving the Problems Based on the experience as described above, the present inventors have succeeded in developing the vacuum degassing apparatus of the present invention as a result of various studies.
The technical constitution of the present invention is as specified in the claims, and the details will be described below.
即ちMgO−Ｃれんが背面に可撓性かつ加圧収縮性を有す
るMgO質ボードを使用することが効果的であることを確
認した。つまり、ボード使用の目的は、MgO−Ｃれんが
背面とボードを密着させることによってMgO−Ｃれんが
の背面の空気等の酸化性ガスによるグラファイトの酸化
消失を防止することである。本発明者等は、この目的に
合致するボードを開発した。That is, it was confirmed that it is effective to use a MgO-based board having flexibility and pressure shrinkability on the back surface of the MgO-C brick. That is, the purpose of using the board is to prevent the oxidation disappearance of graphite due to an oxidizing gas such as air on the back surface of the MgO-C brick by bringing the back surface of the MgO-C brick into close contact with the board. The present inventors have developed a board that meets this purpose.
ボードを下部槽の曲率に合せて施工する場合、鉄皮およ
びれんがへの密着性を付与するための可撓性と昇温時の
膨張を吸収するための加圧収縮性が必要である数多くの
ボードにつき検討した結果、ＲＨ式真空脱ガス装置の下
部槽MgO−Ｃライニングの背面に施工するボードの品質
として、表−１に示したように可撓度５mm以上。可縮率
が1500℃、0.5mg/cm2の荷重下で30〜60％の加圧収縮性
を有するMgO値90％のMgO質ボードが良好な一例である。When the board is constructed according to the curvature of the lower tank, it is necessary to have flexibility to give adhesion to the iron skin and brick and pressure shrinkage to absorb expansion at temperature rise. As a result of examining the board, as the quality of the board to be installed on the rear surface of the lower tank MgO-C lining of the RH type vacuum degasser, the flexibility is 5 mm or more as shown in Table-1. An example of a good MgO quality board having a MgO value of 90% and a shrinkage rate of 1500 ° C and a load of 30 to 60% under a load of 0.5 mg / cm 2 is good.
なお、ボードの加圧収縮性については使用するボードの
厚さにより30〜60％の範囲で選定することができる。The pressure shrinkage of the board can be selected within the range of 30 to 60% depending on the thickness of the board used.
また、品質についてはマグネシア（MgO）の他、アルミ
ナ（Al2O3）、スピネル（MgO−Al2O3）等も使用するこ
とができ、本出願人による特公昭60−58184号記載の耐
火ボードも好適な一例である。Regarding the quality, besides magnesia (MgO), alumina (Al 2 O 3 ) and spinel (MgO-Al 2 O 3 ) can be used, and the fire resistance described in Japanese Patent Publication No. 60-58184 by the applicant. A board is also a suitable example.
なお、ボードは酸化防止とともに、れんがの膨張吸収シ
ロにもなっている。このため可縮率が小さすぎると、ボ
ードの厚みを大きくしなければならず、可撓度がないた
め内円周上の施工不良、および断熱効果が大きくなる
ことによりMgO−Ｃれんがの溶損が大きくなるためれん
がの寿命を低下させることになる。The board not only serves as an anti-oxidant, but also as an expansion and absorption silo for bricks. For this reason, if the shrinkage ratio is too small, the thickness of the board must be increased, and since there is no flexibility, the work failure on the inner circumference and the heat insulation effect increase, and the melting loss of MgO-C bricks occurs. The larger size will reduce the life of the brick.
また可縮率が大きすぎるとボードの厚みが小さくなるた
め、鉄皮温度上昇にともなう鉄皮変形、昇熱ロス等の問
題が生ずる。On the other hand, if the shrinkage ratio is too large, the thickness of the board becomes small, which causes problems such as iron shell deformation and heat loss due to an increase in iron shell temperature.
第１図は本発明装置において施工された真空容器の部分
縦断面図の一例を示し： １はMgO−Ｃれんが、 ２は可撓性かつ加圧収縮性を有するMgO質ボード、 ３は永久張り耐火物層、 ４は断熱材層、 ５は外側鉄皮、 をそれぞれ示す。FIG. 1 shows an example of a partial vertical cross-sectional view of a vacuum container constructed in the apparatus of the present invention: 1 is a MgO-C brick, 2 is a flexible and pressure-shrinkable MgO quality board, and 3 is a permanent tension. A refractory layer, 4 is a heat insulating material layer, and 5 is an outer steel skin.
前記表−１のように使用後のボードは見掛気孔率が低く
なりかつ強度も発現している。 As shown in Table 1, the board after use has a low apparent porosity and exhibits strength.
なお、ボードの通気率は侵入ガス量を抑えるため、小さ
いほど良い。経験上、使用後ボードの通気率は平均して
８×１０−２（cm3・cm／cm2・cmＨ２Ｏ・sec）となっ
ており、10×10-2以下になると酸化防止効果は大と考え
られる。The air permeability of the board is preferably as small as possible in order to suppress the amount of invading gas. From experience, the average air permeability of the board after use is 8 × 10 -2 (cm 3 · cm / cm 2 · cmH 2 O · sec), and the antioxidant effect is less than 10 × 10 -2. Considered large.
発明の効果 従来の直接結合マグ・クロれんがでは、ＲＨ式真空脱ガ
ス装置の下部槽寿命は短命であったものが、MgO−Ｃれ
んがを本発明装置のように施工した結果1.7倍の寿命を
延長することができ、かつMgO−Ｃれんがの背面酸化は
３mm程度であることが視認され、この程度の酸化はれん
が寿命には全く影響を与えるものでないことが認められ
た。Effect of the Invention In the conventional direct-coupled mag-chromic brick, the life of the lower tank of the RH-type vacuum degassing device was short, but as a result of applying MgO-C brick like the device of the present invention, the life is 1.7 times longer. It was visually confirmed that the backside oxidation of the MgO-C bricks could be extended and was about 3 mm, and it was confirmed that this degree of oxidation had no effect on the life of the bricks.
即ち本発明装置とすることにより、真空容器のMgO−Ｃ
れんがの背面酸化損傷を充分に抑制することができ、Mg
O−Ｃれんがの高耐蝕性を十分に活用し得ることが認め
られた。なお本発明はＲＨ式だけでなくＤＨ（Dortmund
−Ｈrder）式真空脱ガス装置にも適用できることはも
ちろんである。That is, by using the device of the present invention, the MgO-C of the vacuum container is
It is possible to sufficiently suppress the backside oxidation damage of bricks.
It was found that the high corrosion resistance of OC bricks could be fully utilized. The present invention is applicable not only to the RH type but also to the DH (Dortmund
Of course, it can be applied to a (-Hrder) type vacuum degassing device.
第１図は本発明装置における真空容器壁の部分縦断面図
の一例を示し、図中、１はMgO−Ｃれんが、２は可撓性
かつ加圧収縮性を有するMgO質ボード、３は永久張り耐
火物質、４は断熱材層、５は外側鉄皮である。FIG. 1 shows an example of a partial vertical cross-sectional view of the vacuum vessel wall in the apparatus of the present invention, in which 1 is MgO-C brick, 2 is a flexible and pressure-shrinkable MgO-quality board, and 3 is permanent. Upholstery refractory material, 4 is an insulation layer, 5 is an outer skin.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 伊東 克則 岡山県備前市伊部1931番地 (72)発明者 大塚 英泰 茨城県鹿島郡鹿島町大字宮中1190番地 (56)参考文献 特開 昭53−106636（ＪＰ，Ａ) ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Katsunori Ito 1931 Ibe, Bizen City, Okayama Prefecture (72) Inventor Hideyasu Otsuka 1190, Miyanaka, Kashima-cho, Kashima-gun, Ibaraki Prefecture (56) Reference JP-A-53-106636 (JP, A)
Claims (1)
MgO−Ｃれんが背面部に可撓度５mm以上の可撓性でかつ1
500℃、0.5kg／cm2の荷重下で30〜60％の可縮率の加圧
収縮性を有する、可撓性ボードを配設したことを特徴と
する真空脱ガス装置。1. A refractory lining for a vacuum degasser, comprising:
MgO-C brick is flexible with a flexibility of 5 mm or more on the back side and
A vacuum degassing apparatus comprising a flexible board, which has a pressure-shrinkability with a shrinkage ratio of 30 to 60% under a load of 500 ° C and 0.5 kg / cm 2 .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61096871A JPH0631681B2 (en) | 1986-04-28 | 1986-04-28 | Vacuum degasser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61096871A JPH0631681B2 (en) | 1986-04-28 | 1986-04-28 | Vacuum degasser |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62255785A JPS62255785A (en) | 1987-11-07 |
| JPH0631681B2 true JPH0631681B2 (en) | 1994-04-27 |
Family
ID=14176492
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61096871A Expired - Fee Related JPH0631681B2 (en) | 1986-04-28 | 1986-04-28 | Vacuum degasser |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0631681B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4644911B2 (en) * | 2000-06-07 | 2011-03-09 | Ｊｆｅスチール株式会社 | Refractory lining structure for vacuum degassing vessel |
| JP5680297B2 (en) * | 2009-11-17 | 2015-03-04 | Ｊｆｅスチール株式会社 | Refractory lining structure for steelmaking containers |
| JP5541992B2 (en) * | 2010-07-21 | 2014-07-09 | 黒崎播磨株式会社 | RH vacuum degasser lower tank |
| CN106082910A (en) * | 2016-06-13 | 2016-11-09 | 南通南京大学材料工程技术研究院 | One can porcelain flexible heat-insulating tapestry brick and preparation method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53106636A (en) * | 1977-03-02 | 1978-09-16 | Nippon Kokan Kk | Casting vessel having basic lining and use thereof |
-
1986
- 1986-04-28 JP JP61096871A patent/JPH0631681B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62255785A (en) | 1987-11-07 |
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| Date | Code | Title | Description |
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| R250 | Receipt of annual fees |
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