JPS62205220A - Degassing and desulfurizing method for molten steel - Google Patents
Degassing and desulfurizing method for molten steelInfo
- Publication number
- JPS62205220A JPS62205220A JP4519286A JP4519286A JPS62205220A JP S62205220 A JPS62205220 A JP S62205220A JP 4519286 A JP4519286 A JP 4519286A JP 4519286 A JP4519286 A JP 4519286A JP S62205220 A JPS62205220 A JP S62205220A
- Authority
- JP
- Japan
- Prior art keywords
- molten steel
- powder
- desulfurizing agent
- time
- desulfurization
- 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
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 43
- 239000010959 steel Substances 0.000 title claims abstract description 43
- 230000003009 desulfurizing effect Effects 0.000 title claims abstract description 21
- 238000007872 degassing Methods 0.000 title claims abstract description 7
- 238000000034 method Methods 0.000 title claims description 9
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 43
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 37
- 230000023556 desulfurization Effects 0.000 claims abstract description 37
- 239000000843 powder Substances 0.000 claims abstract description 27
- 238000009849 vacuum degassing Methods 0.000 claims abstract description 8
- 239000012159 carrier gas Substances 0.000 claims abstract description 7
- 238000002347 injection Methods 0.000 claims description 12
- 239000007924 injection Substances 0.000 claims description 12
- 238000007664 blowing Methods 0.000 abstract description 5
- 230000007423 decrease Effects 0.000 abstract description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052593 corundum Inorganic materials 0.000 abstract description 3
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract description 3
- 239000000654 additive Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000009489 vacuum treatment Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 229910002551 Fe-Mn Inorganic materials 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 238000004581 coalescence Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000006356 dehydrogenation reaction Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、ＲＨ，ＤＨなどの真空脱ガス装置による溶
鋼の真空脱ガス処理方法に係り特に真空処理槽への粉体
脱硫剤の吹込脱憾剤の吹込方法に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for vacuum degassing treatment of molten steel using a vacuum degassing device such as RH or DH, and particularly relates to a method for degassing molten steel by blowing a powder desulfurization agent into a vacuum treatment tank. This relates to a method of injecting a retardant.
従来の真空処理槽への粉体添加剤送入方法としては、特
公昭４５−２２２０４号「溶融金属の真空脱硫方法」が
ある。これはＲＨ真空処理に際して、ＲＨの環流用気体
を添加剤のキャリアーガスとして利用し、上昇管内溶鋼
中へ粉体脱硫剤を懸濁させるものである。しかしながら
、溶鋼中のＡｌ１２０３ の影響については、言及し
ていない。A conventional method for feeding powder additives into a vacuum processing tank is disclosed in Japanese Patent Publication No. 45-22204 entitled "Vacuum Desulfurization Method for Molten Metals." This uses the RH reflux gas as a carrier gas for additives during the RH vacuum treatment, and suspends the powder desulfurization agent in the molten steel in the riser pipe. However, no mention is made of the influence of Al1203 in molten steel.
この発明は、従来技術での真空槽内への粉体添加方法に
比べ、Ｍ投入による脱酸時から粉体脱硫剤吹込までの時
間をおき、溶鋼中のＡｌ２Ｏ３濃度で低減した状態で粉
体脱硫剤ケ吹込むことにより、脱硫効率を飛躍的に向上
させることができると共に脱硫と同時に脱ガスも行なう
ことができ、また真空処理槽の耐火物への影響に最小限
にすることを目的とする。Compared to the prior art method of adding powder into a vacuum chamber, this invention takes time from the time of deoxidizing by adding M to the time of injecting powder desulfurization agent, and the powder is added in a state where the Al2O3 concentration in the molten steel is reduced. By injecting a desulfurizing agent, desulfurization efficiency can be dramatically improved, and degassing can be performed at the same time as desulfurization, and the purpose is to minimize the impact on the refractories of the vacuum treatment tank. do.
本発明は以上に述べた従来技術が有する多くの欠点を解
決したもので、真空脱ガス市内下部で且つ溶鋼浴面下に
位置する部分に脱硫剤吹込羽口を設け、その吹込時期イ
、Ｍ投入後から
Ａ ＝ ０．０２Ｗ ＋ ５
ｔ：ＡＩ！、投入後から粉体脱硫剤吹込開始までの時間
（分）
Ｗ：溶鋼量
で表わされるｔ分身上経過後、溶鋼中のＡＬｚ Ｏ，ｓ
濃度全低減した状態で、粉体脱硫剤でキャリアーガスに
て溶鋼中に直接吹込むことケ特徴とするものである。The present invention solves many of the drawbacks of the prior art described above, and includes providing a desulfurizing agent injection tuyere in the lower part of the vacuum degassing city and below the surface of the molten steel bath. After M is turned on, A = 0.02W + 5 t: AI! , time (minutes) from the time of injection until the start of powder desulfurization agent injection W: After t, expressed as the amount of molten steel, ALz O,s in the molten steel
The feature is that the powder desulfurization agent is directly blown into the molten steel using a carrier gas while the concentration is completely reduced.
次に第１図にもとづいて、不発明の１例について詳述す
る。Next, an example of non-invention will be described in detail based on FIG.
第１図はＲＨ真空槽での例？示めすもので、〕は真空脱
ガス槽、２は排気口、３は溶鋼、４は溶鋼取鍋、５は粉
体脱硫剤吹込羽口、６は粉体脱硫剤供給管、７は脱硫剤
供給装置、８はキャリアーガス体、９はスラグである。Is Figure 1 an example of an RH vacuum chamber? ] is a vacuum degassing tank, 2 is an exhaust port, 3 is molten steel, 4 is a molten steel ladle, 5 is a powder desulfurization agent injection tuyere, 6 is a powder desulfurization agent supply pipe, and 7 is a desulfurization agent A supply device, 8 is a carrier gas body, and 9 is a slag.
この発明は、溶鋼中のＡｅ２０．濃度を低減した状態で
、真望脱ガス処理中に脱硫剤供給装置７から脱硫剤供給
装置６を経由して脱硫剤吹込羽口より溶鋼３中へ脱硫剤
ケ直接吹込むものである。This invention is directed to Ae20.0 in molten steel. The desulfurizing agent is directly blown into the molten steel 3 from the desulfurizing agent supplying device 7 through the desulfurizing agent supplying device 6 and from the desulfurizing agent injection tuyere during the desired degassing treatment in a reduced concentration state.
Ａｉ！は溶鋼の脱酸剤として添加されるが、このＡＱ投
入によって生成するＡｉｄ２０３は、 粉体脱硫剤と合
体するとサルファイドキャパシティが下がり、脱硫能を
低下させる。したかつで、脱酸剤としてのＡＣ添加と粉
体脱硫剤吹込までの時間ヶ充分おくことにより、溶鋼中
のＡｌ２Ｏ３濃度が低減され、粉体脱硫剤との合体が少
なくなり脱硫効率が上がる。Ai! is added as a deoxidizing agent to molten steel, but when Aid203 produced by adding AQ combines with the powder desulfurizing agent, the sulfide capacity decreases and the desulfurizing ability decreases. By allowing sufficient time between adding AC as a deoxidizing agent and injecting the powder desulfurization agent, the Al2O3 concentration in the molten steel is reduced, the amount of coalescence with the powder desulfurization agent is reduced, and the desulfurization efficiency is increased.
ＡＱ添加から粉体脱硫剤吹込開始までの時間は。What is the time from AQ addition to the start of powder desulfurization agent injection?
長ければ長いほど溶鋼中Ａｊ！２０３が浮」ニするので
望ましい。が、あまりに長時間となるのは溶製上問題が
あり、またコストの点で得ではない。我々は種々の条件
で操業を行ったネ６来、ＡＱ投入からｔ ＝＝ ０．
０２Ｗ ＋ ５
ｔ：Ａ１投入后から粉体脱硫剤吹込開始までの時間（分
）
Ｗ：溶鋼量、（ｔ）
で表わされるｔ分身上経過後、粉体脱硫剤゛と吹込むこ
とにより脱硫効率が飛躍的に向上することケ見い出した
。第２図に、ＡＣ投入後から粉体吹込開始までの時間（
ｔ）と脱硫率の関係で示す。The longer it is, the more molten steel Aj! 203 is desirable because it floats. However, if the process is too long, there are problems in melting and it is not advantageous in terms of cost. We have conducted operations under various conditions, and since AQ input, t == 0.
02W + 5 t: Time (minutes) from A1 injection to the start of powder desulfurization agent injection W: Molten steel amount, (t) After t has passed, the desulfurization efficiency can be increased by injecting powder desulfurization agent. We found that this improved dramatically. Figure 2 shows the time from turning on the AC to starting powder injection (
t) and the desulfurization rate.
条件
５ＨでＢＢでＡｌ １． ＯＫｇ／ Ｔ投入２）脱硫剤
原単位 ３Ｋｑ／Ｔ
３）処理前（Ｓ） ＝＝３０〜４０ ｐ、ｐｍ２５０Ｔ
溶鋼の例であるが、１０分以上の時間をおくことにより
１０分以下の時間しかおかない場合に比べ脱硫率が安定
して高い。出鋼抜取鍋中で底部からの不活性ガスの吹込
みいわゆるＢ、 Ｂ、の際にＭ投入しπ例（ｔ＝ｌ ｏ
〜１２分経過）で、 ＢＢでＡｇ投入の方がＲＨでＡＩ
全投入しπ例よりわずかに高い脱硫率が得られているが
、これはＢＢＯ方がＲＨに比べ攪拌力が強くＡ１．２０
．濃度の低減が早いためである。Al in BB under condition 5H 1. OKg/T input 2) Desulfurizing agent consumption 3Kq/T 3) Before treatment (S) ==30~40 p, pm250T
As an example of molten steel, by waiting for 10 minutes or more, the desulfurization rate is stably higher than when waiting for only 10 minutes or less. Inert gas is blown from the bottom of the tapping ladle during so-called B, B, and M is added for π example (t=l o
~12 minutes have elapsed), Ag input at BB is better than AI at RH.
A slightly higher desulfurization rate was obtained than in the π example with full input, but this is because BBO has a stronger stirring force than RH and A1.20
．． This is because the concentration decreases quickly.
また、ｔ＝１０分経過後の溶鋼を調査した結果、溶鋼中
Ａ１２ Ｏｓ 濃度が約０．Ｏ１％以下程度に相当する
もので、Ａｅ２ｏ３＃度がこの程度に低くなると粉体脱
硫剤が効率良く脱硫に寄与する。また、１５０ＴＲＨで
は、第２図に示す条件でｔ、 ＝ ８分以上で脱硫効率
が２０％上昇し８０係が得られ、溶鋼量が少ない場合に
は５Ｍ投入后から、粉体脱硫剤吹込までの時間は少し短
くても高効率となる。Furthermore, as a result of investigating the molten steel after t=10 minutes, the A12Os concentration in the molten steel was approximately 0. This corresponds to about 1% or less of O, and when the Ae2o3# degree is as low as this, the powder desulfurization agent efficiently contributes to desulfurization. In addition, with 150TRH, under the conditions shown in Figure 2, the desulfurization efficiency increased by 20% to a ratio of 80 at t = 8 minutes or more, and when the amount of molten steel was small, powder desulfurization agent could be injected after 5M was added. Even if the time is a little shorter, the efficiency is high.
まだ、不発明では脱硫効率が飛躍的に向」ニするため、
脱硫剤原単位が低減し、それにつれて耐火物への影響も
少なくすることができる。However, desulfurization efficiency can be improved dramatically without invention.
The unit consumption of desulfurizing agent is reduced, and the impact on refractories can be reduced accordingly.
本発明の実施例として、２５０Ｔ処理槽のＦ（Ｈ真空槽
の実施例ケ示す。As an example of the present invention, an example of an F(H vacuum chamber) of a 250T processing tank is shown.
実施例］
処理浴鋼量 ２５０Ｔ
添加材 Ａｌｌ １５０ Ｋｇ 取鍋へ出鋼後
バブリングＶζて冷加
時 間 成投入眉からＲＨ処理開始煮て１（〕分
添加材 （Ｈ，Ｃ）Ｆｅ−Ｍｎ １２０Ｋｐ真空
脱ガス処理開始２分経過後
脱硫剤 ８０％ Ｃ，Ｏ−２０％Ｃ，Ｆ２キャリア
ーガス（ｔ００Ｎ靜／Ｈ，Ａｒ処理開始５分経過後
脱硫剤 吹込時間 １０分
吹込量 ６Ｋｇ／Ｔ
溶鋼成分変化
実施例２
処理溶鋼量 ２５０Ｔ
添加材 Ａｌ １５０匂出鋼時添加時 間 Ｍ
投入後からＲＨ処理開始まで７分
Ｆｅ−８ｉ ７０Ｋｆ
処理開始２分経過後
フラックス ６５チ Ｃ，０−３５チＣ，Ｆ。Example] Amount of steel in treatment bath 250T Additives All 150 Kg Cooling time by bubbling Vζ after tapping into a ladle RH treatment starts from the end of the steel boiling for 1 minute Additives (H, C) Fe-Mn 120Kp 2 minutes after the start of vacuum degassing treatment, desulfurization agent 80% C, O-20% C, F2 carrier gas (t00N/H, Ar 5 minutes after the start of treatment, desulfurization agent Blow time: 10 minutes Blow rate: 6Kg/T Molten steel composition Variation Example 2 Processing amount of molten steel 250T Additive material Al Addition time for 150 molten steel M
7 minutes from input to start of RH treatment Fe-8i 70Kf 2 minutes after start of treatment Flux 65chi C, 0-35chi C, F.
キャリアーガ、Ｘ、 （ｔ１００Ｎ／Ｈ，Ａｒ処理開始
１０分経過後
フラックス 吹込時間 １０分
吹込量 ３匂／Ｔ
溶鋼成分変化
上記に示めすように、本発明ではＭ投入後から粉体脱硫
剤吹込開始までぃ一定の時間をおき、溶鋼中Ａ！２Ｑ、
濃度を低減し、た状態で脱硫することにより脱硫剤の槽
内下部への吹込により（Ｓ）≦１０ｐｐｍ、（Ｈ）≦１
．ｏｐｐｍを達成している。Carrier gas, Wait a certain period of time until the start, and during the molten steel A!2Q,
By reducing the concentration and desulfurizing in a state where the desulfurizing agent is blown into the lower part of the tank, (S)≦10ppm, (H)≦1
．． Achieved oppm.
本発明は、Ｍ投入から粉体脱懺剤吹込まで、ｔ ＝
０．０２Ｗ ＋ ５
ｔ：Ａ１投入后から粉体脱硫剤吹込開始までの時間（分
）
Ｗ：溶鋼量（ｔ）
で表わされるｔ分おき、真空槽内下部から羽口を通して
脱硫剤を直接溶鋼中へ吹込むことにより溶鋼中の〔Ｓ〕
≦１０ ｐｐｍ 、 （Ｈ）≦１．０ｐｐｍという高品
質の鋼を得ることができ脱硫と脱水素の同時処理を可能
とした極めて有用性の高い発明である。In the present invention, the powder descaling agent is injected from M input, and t =
0.02W + 5 t: Time (minutes) from the time A1 is introduced until the start of powder desulfurization agent injection W: Amount of molten steel (t) Every t minutes, the desulfurization agent is directly injected into the molten steel from the lower part of the vacuum chamber through the tuyere. [S] in molten steel by blowing it into
This is an extremely useful invention that enables the production of high-quality steel of ≦10 ppm and (H)≦1.0 ppm, and enables simultaneous desulfurization and dehydrogenation treatment.
第１図は本発明方法に使用する真空脱ガス槽の概要図、
第２図は本発明の効果を示す脱硫率を示す図である。
９：スラグFigure 1 is a schematic diagram of the vacuum degassing tank used in the method of the present invention;
FIG. 2 is a diagram showing the desulfurization rate showing the effect of the present invention. 9: Slag
Claims (1)
口を通して粉体脱硫剤をキャリアーガスにて溶鋼中に直
接吹込むに際し、Ａｌ投入後からｔ＝０．０２Ｗ＋５・
・・・・・・・・・・・・・・（分）ｔ：Ａｌ投入後か
ら粉体脱硫剤吹込開 始までの時間・・・・・・・（分） ｗ：溶鋼量・・・・・・・・・・・・・（ｔ）で表わさ
れるｔ分以上経過後、粉体脱硫剤を吹込むことを特徴と
する溶鋼の脱ガス、脱硫方法。[Claims] When injecting powder desulfurization agent directly into molten steel using a carrier gas through the desulfurization agent injection tuyere provided below the surface of the molten steel bath in the lower part of the vacuum degassing tank, from t=0 after Al is introduced. .02W+5・
・・・・・・・・・・・・・・・(minutes) t: Time from the time of adding Al to the start of powder desulfurization agent injection・・・・・・・・・(minutes) w: Amount of molten steel... A method for degassing and desulfurizing molten steel, characterized by injecting a powder desulfurizing agent after t minutes or more, expressed as (t).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4519286A JPS62205220A (en) | 1986-03-04 | 1986-03-04 | Degassing and desulfurizing method for molten steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4519286A JPS62205220A (en) | 1986-03-04 | 1986-03-04 | Degassing and desulfurizing method for molten steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62205220A true JPS62205220A (en) | 1987-09-09 |
| JPH0361722B2 JPH0361722B2 (en) | 1991-09-20 |
Family
ID=12712404
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4519286A Granted JPS62205220A (en) | 1986-03-04 | 1986-03-04 | Degassing and desulfurizing method for molten steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62205220A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000129335A (en) * | 1998-10-20 | 2000-05-09 | Nkk Corp | Production of extra-low sulfur steel excellent in cleanliness |
| JP2008260997A (en) * | 2007-04-11 | 2008-10-30 | Nippon Steel Corp | Desulfurization method of molten steel |
| JP2016183378A (en) * | 2015-03-26 | 2016-10-20 | Ｊｆｅスチール株式会社 | Desulfurization method for molten steel |
-
1986
- 1986-03-04 JP JP4519286A patent/JPS62205220A/en active Granted
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000129335A (en) * | 1998-10-20 | 2000-05-09 | Nkk Corp | Production of extra-low sulfur steel excellent in cleanliness |
| JP2008260997A (en) * | 2007-04-11 | 2008-10-30 | Nippon Steel Corp | Desulfurization method of molten steel |
| JP2016183378A (en) * | 2015-03-26 | 2016-10-20 | Ｊｆｅスチール株式会社 | Desulfurization method for molten steel |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0361722B2 (en) | 1991-09-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |