JPS6213515A - Lining construction of vacuum degassing device for steel making - Google Patents
Lining construction of vacuum degassing device for steel makingInfo
- Publication number
- JPS6213515A JPS6213515A JP15253185A JP15253185A JPS6213515A JP S6213515 A JPS6213515 A JP S6213515A JP 15253185 A JP15253185 A JP 15253185A JP 15253185 A JP15253185 A JP 15253185A JP S6213515 A JPS6213515 A JP S6213515A
- Authority
- JP
- Japan
- Prior art keywords
- degassing device
- binder
- limestone
- coating material
- vacuum degassing
- 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.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、清浄鋼をつ(るための製鋼用真空脱ガス装置
のライニング構造に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a lining structure for a vacuum degassing apparatus for steel manufacturing for storing clean steel.
従来の技術
土木、建築、船舶、機械、化学、電気 工業などに使用
きれる鋼材の要求品質は厳しくなってきている。製鋼関
係では混銑車等での溶銑脱硫、真空脱ガス装置による不
純物の除去などにて高品質な鋼材の製造が行なわれてい
る。しかし、l)スラグ、コ) Aj3205等の脱
酸生成物、3)溶鋼の再酸化、リ 耐大物の損傷等に起
因する酸化物系介在物が鋼材の品質を低下させている。Conventional technology The quality requirements for steel materials that can be used in civil engineering, architecture, ships, machinery, chemicals, electrical industries, etc. are becoming stricter. In the steel manufacturing industry, high-quality steel products are manufactured by desulfurizing hot metal using a pig iron mixer and removing impurities using a vacuum degassing device. However, 1) slag, 3) deoxidation products such as AJ3205, 3) reoxidation of molten steel, and oxide inclusions caused by damage to large objects, etc., deteriorate the quality of steel materials.
これらに対処するため、’) 転炉出鋼時のスラグカ
ット等にxDスラグを除去、2)溶鋼中に不活性ガスを
吹き込む、ま次は合成7ラツクスを使用し脱酸生成物を
浮上分離除去、3)大気と溶鋼との接触を防ぎ溶鋼の再
酸化を防止、μ)耐食性の高い耐火物を使用し耐火物の
損傷を抑制等の方法を実施し効果をあげている。In order to deal with these, ') removing xD slag during slag cutting during converter tapping, 2) injecting inert gas into molten steel, and then flotation separation of deoxidized products using Synthetic 7lux 3) Preventing contact between the atmosphere and molten steel to prevent re-oxidation of molten steel, and μ) Using highly corrosion-resistant refractories to suppress damage to refractories.
発明が解決しようとする問題点
耐火物の損傷により生成される介在物は大きさが数十μ
〜数百μであり、最も浮上分離しがたい酸化物介在物と
なっている。すなわち10μ以下の酸化物系介在物は鋼
材の均質性にそれ程影響を及ti′さないし、数百μ以
上のものは溶鋼の浮力により浮上し問題はほとんどない
。これに対し数十μ〜数百μの酸化物系介在物は溶鋼中
に懸濁し、そのまま鋼中に留まシやす(鋼材の品質を低
下させる・この耐火物に起因する酸化物系介在物σ)大
1!ζは用いる耐火物の結晶粒子が30μ以上のものを
使用していることによると考えられる。Problem to be solved by the invention Inclusions generated due to damage to refractories are several tens of microns in size.
~ several hundred microns, making it the most difficult oxide inclusion to float and separate. That is, oxide inclusions with a size of 10 μm or less do not significantly affect the homogeneity of the steel material, and those with a size of several hundred μm or more float up due to the buoyancy of the molten steel and cause almost no problem. On the other hand, oxide inclusions of several tens of microns to several hundred microns are suspended in the molten steel and remain in the steel as they are. σ) Big 1! It is thought that ζ is due to the fact that the crystal grains of the refractory used are 30μ or more.
耐火物に起因する酸化物系介在物の中で8102系介在
物は、軟らか(展性があるため一比較的問題とならない
。これに対t、 Ag2o 3系、N(go系、スピネ
ル系の介在物は硬(展性がな(断線や表面疵等の不良原
因となる。Among the oxide-based inclusions caused by refractories, 8102-based inclusions are soft (malleable) and therefore pose relatively no problem. Inclusions are hard (not malleable) and cause defects such as wire breakage and surface flaws.
転炉以降の製鋼プロセスの中で、取鍋は泪02−^l/
206糸、あるいFiZ r 8 + Oa 系の耐
火物が主として用いられ連鋳タンディシュはMgO系の
被覆材が主に用いられている。In the steelmaking process after the converter, the ladle
206 yarn or FiZ r 8 + Oa type refractories are mainly used, and for continuous cast tundishes, MgO type coating materials are mainly used.
RHやD)1方式等の真空脱ガス装置のライニングは、
マグ・りaレンガやアルミナ系キャスタブルが用いられ
、熱間補修材としてはマグネジ了系吹付材やアルミナ系
圧入材が用いられている。すなわち、RH−PDH方式
は鋼材品質向上の手段であるがMgO、A12o6、ス
ピネル系耐火物を使用しているため溶鋼を汚染させる可
能性も有している。The lining of vacuum degassing equipment such as RH and D)1 type is as follows:
Magnetic resin bricks and alumina castables are used, and as hot repair materials, magnetic spraying materials and alumina press-fitting materials are used. That is, although the RH-PDH method is a means of improving the quality of steel materials, it also has the possibility of contaminating molten steel because it uses MgO, A12o6, and spinel-based refractories.
本発明は石灰石あるいは苦灰石からなる被覆材を脱ガス
装置の耐火物ライニングの上に被覆し、ニジ清浄な鋼を
つくることを目的とし友ものである。The object of the present invention is to coat a refractory lining of a degasser with a covering material made of limestone or dolomite to produce a steel that is completely clean.
問題点を解決するための手段
本発明者らは石灰石および/又は苦灰石と結合剤から作
られた被覆材を脱ガス装置のライニング耐火物の上に吹
付、流し込み、圧入、パッチング等の方法で被覆し10
00℃以上の温度で予熱しであるいは予熱せずに使用す
る。この石灰石あるいは苦灰石の被覆材から生成する0
JIO6るいはMgOは10μ以下の微細な結晶でメジ
、数十μ〜数百μの酸化物系介在物の発生を防止できる
。Means for Solving the Problems The inventors have proposed a method of spraying, pouring, pressing, patching, etc. a coating material made of limestone and/or dolostone and a binder onto the lining refractory of a degasser. coated with 10
Use with or without preheating at temperatures above 00°C. 0 generated from this limestone or dolomite covering material
JIO6 or MgO has fine crystals of 10 μm or less and can prevent the generation of oxide-based inclusions of several tens to hundreds of μm.
本発明は石灰石あるいは苦灰石の1種またはコ穐の10
0重量にとアルカリ金属の無機化合物または無機塩ある
いは/% I:tた化化合物の1種以上全外掛で0.1
−20重量にを結合剤として添加してなる被覆材を脱ガ
ス装置のライニング耐火物であるマグ・クロレンガ、ア
ルミナキャスタブル等の表面に吹付、流し込み、圧入、
パッチング等の施行方法によシ!〜!Om/mの厚みで
被覆してマグ・りaレンガやアルミナキャスタブルに起
因するMgO、A#205、スピネル系の数十μ〜数百
μの酸化物系介在物の発生を抑制する方法である。The present invention is a type of limestone or dolostone, or
Inorganic compounds or inorganic salts of alkali metals or /% I: 0.1% by weight of one or more compounds
-20% by weight of the coating material added as a binder is sprayed, poured, or press-fitted onto the surface of the refractory lining of the degassing equipment, such as mag/chlorite brick or alumina castable.
Depends on the method of patching etc. ~! This method suppresses the generation of MgO, A#205, and spinel oxide inclusions of tens to hundreds of microns caused by mag-rear bricks and alumina castables by coating with a thickness of Om/m. .
石灰石あるいは苦灰石にアルカリ金属の無機化合物また
は無機塩あるいはハロゲン化化合物を結合剤として用い
ると高温で使用しても収縮せず焼結が防止される。この
ため石灰石・あるいは苦灰石から生ずるOaOあるいは
MgOの結晶径は10μ以下の微細なものでかつ活性な
ものである。If an alkali metal inorganic compound or inorganic salt or a halogenated compound is used as a binder for limestone or dolomite, it will not shrink even when used at high temperatures and sintering will be prevented. Therefore, OaO or MgO produced from limestone or dolomite has a fine crystal size of 10 μm or less and is active.
本発明に用いる石灰石、苦灰石は特に限定するものでは
な(、通常日本で用いられているもので良い。また、粒
度面でも通常耐火物に用いられている粒度で何ら支障は
ない。The limestone and dolomite used in the present invention are not particularly limited (but may be those commonly used in Japan. In addition, in terms of particle size, there is no problem with the particle size normally used for refractories.
結合剤はアルカリ金属の無機化合物または無機塩あるい
はハロゲン化化合物の1種以上を使用しなければならな
い。これ以外の無機化合物音用いると焼成収縮が大き(
亀□裂、脱落を発生しやすくなるとともにOaO、Mg
Oの結晶成長が生じioμ以上の結晶径となるため好ま
しくない。すなわち、アルカリ金属の無機化合物ま次は
無機塩あるいはハロゲン化化合物を結合剤とした時の焼
成収縮は0〜2に程度で構造体として使用できるのに対
し、これ以外の結合剤を用いた場合には10%以上の収
縮を示す友め亀裂、脱落を発生し申す(なシ、被覆材へ
の使用は不可能となる。The binder must be one or more inorganic compounds or salts of alkali metals or halogenated compounds. If other inorganic compounds are used, the firing shrinkage will be large (
Cracks and shedding are more likely to occur, and OaO, Mg
This is not preferable because O crystal growth occurs and the crystal diameter becomes larger than ioμ. In other words, inorganic compounds of alkali metals can be used as structures with firing shrinkage of about 0 to 2 when inorganic salts or halogenated compounds are used as binders, but when other binders are used If the product shrinks by 10% or more, cracks and falling off occur, making it impossible to use it as a covering material.
結合剤の添加量は0.7−S−2oH量%の範囲内であ
り、O6/重量に未満では結合力が不足し、−〇Xtに
を超えると耐食性が低下する友め好ましくない。用いる
結合剤としてはへキサメタリン酸ナトリウム、リン酸カ
リウム等のアルカリリン酸塩、3号珪酸ソーダ、珪酸カ
リウム等のアルカリ珪酸塩、塩化マグネシウム、塩化力
ルシクム、塩化ナトリウム等のハロゲン化化合物が使用
できる。The amount of the binder added is within the range of 0.7-S-2oH mass %, and if it is less than O6/weight, the binding strength will be insufficient, and if it exceeds -0Xt, the corrosion resistance will deteriorate, which is not preferable. As the binder used, alkali phosphates such as sodium hexametaphosphate and potassium phosphate, alkali silicates such as No. 3 sodium silicate and potassium silicate, and halogenated compounds such as magnesium chloride, lucicum chloride, and sodium chloride can be used. .
大物の冷間あるいは熱間の表面上に吹付、流し込み、圧
入、]ぐツチング等の方法でj〜50戴の厚で施工する
。51未満では被覆層の耐用性が悪(lチャージの使用
途中にiグ・クロレンガやアルミナキャスタブルの稼動
表面が露出する九め好ましくな(、j(7smi超える
と被覆する施工時間が長くかかりすぎmす、脱ガススノ
ーケルの内容積を減じる友め好ましくない。It is applied on the cold or hot surface of large objects by methods such as spraying, pouring, press-fitting, and tucking to a thickness of 1 to 50 mm. If it is less than 51, the durability of the coating layer will be poor (the operating surface of the black brick or alumina castable will be exposed during use of the charge), which is undesirable (if it exceeds 7 smi, the coating will take too long). However, degassing reduces the internal volume of the snorkel, which is undesirable.
石灰石あるいは苦灰石からなる被覆材は1000℃以下
で002ガス金解離する為出来るだけtoo。The coating material made of limestone or dolomite dissociates the 002 gas gold at temperatures below 1000°C, so it should be as much as possible.
C以上で予熱して使用することが望ましい。飯千以下に
実施例を述べる。It is desirable to preheat it to a temperature of C or higher before use. Examples will be described below.
石灰石あるいは苦灰石の被覆材の品質および施工例を表
1に示す。これらの被覆材を几Hg空脱ガス装置のスノ
ーケル部分に適用した。被覆方法は吹付あるhは/およ
び圧入を使用し友、吹付は乾式吹付法を採用し、チャー
ジ毎に自動吹付機にエクスノーケルの内、外面に実施し
次、圧入は大tに厚(M工するのに適しておシ、スノー
ケルの内面に適用し友。Table 1 shows the quality and construction examples of limestone or dolomite covering materials. These coatings were applied to the snorkel portion of a Hg air degasser. The coating method uses spraying and/or press-fitting.The dry spraying method is used, and after each charge, it is applied to the inside and outside of the Exnorkel using an automatic spraying machine. It is suitable for cleaning and can be applied to the inner surface of the snorkel.
石灰石あるいは苦灰石の被覆材を使用し九時としない時
の脱ガス後の取鍋中の介在物指数の比較を表2に示す、
この結果ニジ、石灰石あるいは苦灰石の被覆材の使用に
ニジ鋼中の介在物は低減し効果が認められた。Table 2 shows a comparison of the inclusion index in the ladle after degassing when limestone or dolomite covering material is used and the ladle is not heated.
As a result, inclusions in rainbow steel were reduced when using rainbow, limestone, or dolomite covering materials, and the effect was recognized.
表2 脱ガス後の溶鋼中介在物指数の比較発明の効果 本発明にLり、次の効果が得られる。Table 2 Effect of comparative invention on inclusion index in molten steel after degassing The present invention provides the following effects.
l)石灰石あるいは苦灰石から生成するCjaOあるい
はMgOの結晶径σlθμ以下で鋼材の不良原因にはな
りにぐい。l) If the crystal diameter of CjaO or MgO produced from limestone or dolomite is less than σlθμ, it will hardly cause defects in steel materials.
2)活性力(1a01cニジ脱酸生波物であるA#、、
051−吸収できる。2) Active force (A#, which is a 1a01c rainbow deoxidized raw wave product,
051-Can be absorbed.
3)活性なOaOにより鋼中のS、Pを吸収出来る。3) Active OaO can absorb S and P in steel.
1頁の続きContinued from page 1
Claims (2)
覆材を真空脱ガス装置の内張りライニング耐火物の表面
に被覆した製鋼用真空脱ガス装置のライニング構造。(1) A lining structure for a vacuum degassing device for steel manufacturing, in which the surface of the inner lining refractory of the vacuum degassing device is coated with a coating material made of limestone and/or dolomite and a binder.
機塩あるいはハロゲン化化合物の1種以上を外掛で0.
1〜20重量%添加してなる特許請求の範囲第1項記載
の製鋼用真空脱ガス装置のライニング構造。(2) The binder contains one or more types of alkali metal inorganic compounds, inorganic salts, or halogenated compounds in an amount of 0.
A lining structure for a vacuum degassing device for steel manufacturing according to claim 1, wherein the lining structure is added in an amount of 1 to 20% by weight.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15253185A JPH0230364B2 (en) | 1985-07-12 | 1985-07-12 | SEIKOYOSHINKUDATSUGASUSOCHINORAININGUKOZO |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15253185A JPH0230364B2 (en) | 1985-07-12 | 1985-07-12 | SEIKOYOSHINKUDATSUGASUSOCHINORAININGUKOZO |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6213515A true JPS6213515A (en) | 1987-01-22 |
JPH0230364B2 JPH0230364B2 (en) | 1990-07-05 |
Family
ID=15542474
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15253185A Expired - Lifetime JPH0230364B2 (en) | 1985-07-12 | 1985-07-12 | SEIKOYOSHINKUDATSUGASUSOCHINORAININGUKOZO |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0230364B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104496206A (en) * | 2014-06-19 | 2015-04-08 | 谢英健 | Method for preparation of high activity lime from calcite and comprehensive application of product |
CN113772970A (en) * | 2021-09-01 | 2021-12-10 | 鞍钢集团北京研究院有限公司 | Method for preparing magnesium oxide by using magnesite |
-
1985
- 1985-07-12 JP JP15253185A patent/JPH0230364B2/en not_active Expired - Lifetime
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104496206A (en) * | 2014-06-19 | 2015-04-08 | 谢英健 | Method for preparation of high activity lime from calcite and comprehensive application of product |
CN113772970A (en) * | 2021-09-01 | 2021-12-10 | 鞍钢集团北京研究院有限公司 | Method for preparing magnesium oxide by using magnesite |
CN113772970B (en) * | 2021-09-01 | 2022-09-30 | 鞍钢集团北京研究院有限公司 | Method for preparing magnesium oxide by using magnesite |
Also Published As
Publication number | Publication date |
---|---|
JPH0230364B2 (en) | 1990-07-05 |
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