JPS63238207A - Method for pretreating molten iron - Google Patents
Method for pretreating molten ironInfo
- Publication number
- JPS63238207A JPS63238207A JP7155487A JP7155487A JPS63238207A JP S63238207 A JPS63238207 A JP S63238207A JP 7155487 A JP7155487 A JP 7155487A JP 7155487 A JP7155487 A JP 7155487A JP S63238207 A JPS63238207 A JP S63238207A
- Authority
- JP
- Japan
- Prior art keywords
- hot metal
- slag
- lance
- molten iron
- agent
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims description 19
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title abstract description 22
- 229910052742 iron Inorganic materials 0.000 title abstract description 11
- 239000002893 slag Substances 0.000 claims abstract description 30
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 23
- 230000005587 bubbling Effects 0.000 claims abstract description 15
- 239000007789 gas Substances 0.000 claims abstract description 14
- 238000007664 blowing Methods 0.000 claims abstract description 13
- 239000012159 carrier gas Substances 0.000 claims abstract description 11
- 238000003756 stirring Methods 0.000 claims abstract description 8
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 7
- 230000023556 desulfurization Effects 0.000 claims abstract description 7
- 238000007667 floating Methods 0.000 claims abstract description 5
- 239000002184 metal Substances 0.000 claims description 80
- 229910052751 metal Inorganic materials 0.000 claims description 80
- 239000000843 powder Substances 0.000 claims description 22
- 230000008569 process Effects 0.000 claims description 12
- 238000002203 pretreatment Methods 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 20
- 238000005266 casting Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 3
- 230000003009 desulfurizing effect Effects 0.000 abstract 1
- 229910052698 phosphorus Inorganic materials 0.000 description 8
- 239000011574 phosphorus Substances 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 6
- 229910000805 Pig iron Inorganic materials 0.000 description 5
- 229910052717 sulfur Inorganic materials 0.000 description 4
- 239000011593 sulfur Substances 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000010907 mechanical stirring Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、転炉精錬用の溶銑を、脱Ｓｉ、脱Ｐ、脱Ｓ等
の予備処理を行なう方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for pre-treating hot metal for converter refining, such as removing Si, removing P, and removing S.
従来の技術
従来、鋳床樋にて溶銑上に設置された、又は溶銑中に浸
漬して設置されたランスノズルからキャリアガスと共に
粉体をインジェクションし、溶銑予備処理を行なう方法
については、特開昭５７−２００５１０号公報、特開昭
５８−１３０２０８号公報等多数の開示例がある。Conventional technology A method for pre-treating hot metal by injecting powder together with a carrier gas from a lance nozzle placed above hot metal in a casting bed trough or immersed in hot metal is disclosed in Japanese Patent Application Laid-Open No. There are many disclosed examples, such as Publication No. 57-200510 and Japanese Unexamined Patent Publication No. 130208-1984.
上記従来方法による脱Ｓｉ処理及び脱Ｐ処理において、
各々の反応効率はトピードカー等の容器で行うバッチ処
理等に比べ、反応効率は高いものの、未反応の酸化鉄が
スラグ中に相当量残留し、さらに反応効率を改善する余
地が残されていた。In the Si removal treatment and P removal treatment by the above conventional method,
Although each reaction efficiency was higher than batch processing performed in a container such as a torpedo car, a considerable amount of unreacted iron oxide remained in the slag, leaving room for further improvement in reaction efficiency.
発明が解決しようとする問題点
鋳床溶銑樋での粉体吹込による脱Ｓｉ処理、脱Ｐ処理の
場合、反応効率を改善する余地が残されている理由とし
ては、粉体が溶銑中に吹込まれてから浮上するまでは攪
拌力も強く反応は進行するものの、浮上後はほとんど攪
拌されないため反応は進行せず、したがって反応時間と
しては非常に短く、実際、未反応の酸化鉄がスラグ中に
残留し、一般的にスラグ中の％（ＦｅｌＯ）が高い。Problems to be Solved by the Invention In the case of Si-removal treatment and P-removal treatment by injecting powder into the cast-bed hot metal trough, there is still room for improvement in reaction efficiency. Although the stirring force is strong and the reaction progresses from the time the slag floats until it floats, the reaction does not proceed because there is almost no stirring after floating, and therefore the reaction time is very short, and in fact, unreacted iron oxide remains in the slag. However, the percentage (FelO) in the slag is generally high.
問題点を解決するための手段
本発明は、低燐銑又は低燐、極低硫銑を鋳床で製造する
場合の脱Ｐ反応効率を向上させ、安価に製造できるプロ
セスを提供せんとするものであり、その要旨とするとこ
ろは、
（１）高炉鋳床の溶銑樋において溶銑上に設置された、
又は溶銑中に浸漬して設置された。１個又は複数個のラ
ンスノズルを通じて脱Ｓｉ剤の粉体をキャリアガスにて
溶銑中に吹込んで主として脱ＳｉＬ同時に排滓する第一
工程と高炉鋳床の溶銑樋において溶銑上に設置された、
又は溶銑中に浸漬して設置された。１個又は複数個のラ
ンスノズルを通じて脱Ｐ剤の粉体をキャリアガスにて溶
銑中に吹込んで主として脱Ｐした後、スラグが浮上する
位置に浸漬させたランスノズルからガスを吹込んでバブ
リングを行ない、ついで排滓する第二工程からなること
を特徴とする溶銑予備処理法、および（２）高炉鋳床の
溶銑樋において溶銑上に設置された、又は溶銑中に浸漬
して設置された。１個又は複数個のランスノズルを通じ
て脱Ｓｉ剤の粉体をキャリアガスにて溶銑中に吹込んで
主として脱Ｓｉシ同時に排滓する第一工程と、高炉鋳床
の溶銑樋において溶銑上に設置された。又は溶銑中に浸
漬して設置された、１個又は複数個のランスノズルを通
じて脱Ｐ剤の粉体をキャリアガスにて溶銑中に吹込んで
主として脱Ｐした後、スラグが浮上する位置又は浮上後
の位置に浸漬させたランスノズルからガスを吹込んでバ
ブリングを行ない、ついで排滓する第二工程と、高炉鋳
床の溶銑樋の傾注樋前にて脱Ｓ剤の粉体を自然落下によ
り溶鉄面上に添加し、溶銑樋から傾注樋さらにトピード
カー又は溶銑鍋へ落下する時の攪拌によって脱Ｓし、生
成した脱Ｓスラグは溶銑の放熱防止のためトピードカー
又は溶銑鍋の溶銑面を覆ったまま転炉前まで送られ、そ
の後排出される第三工程からなることを特徴とする溶銑
予備処理法、および（３）１個のランスノズルから吹込
む処理剤の上限量を２５ｋｇ／ｔと定め、それ以上の吹
込量に対しては、複数個のランスを用いて各々のランス
間隔を１．０ｍ以上離して吹込むことを特徴とする前記
（１）、（２）の溶銑予備処理法である。Means for Solving the Problems The present invention aims to improve the dephosphorization reaction efficiency when producing low phosphorus pig iron or low phosphorus or extremely low sulfur pig iron in a cast bed, and to provide a process that can be produced at low cost. The gist is as follows: (1) The hot metal gutter installed above the hot metal in the blast furnace casthouse.
Or installed immersed in hot metal. The first step is to blow the powder of the Si-removal agent into the hot metal using a carrier gas through one or more lance nozzles to remove SiL and simultaneously discharge the slag.
Or installed immersed in hot metal. Powder of the dephosphorizing agent is blown into the hot metal using a carrier gas through one or more lance nozzles to mainly remove phosphor, and then gas is blown through the lance nozzle immersed in the position where the slag floats to perform bubbling. , followed by a second step of discharging the slag, and (2) the hot metal trough of the blast furnace casthouse is installed above the hot metal or is installed immersed in the hot metal. The first step is to blow the powder of the desiliconizing agent into the hot metal using a carrier gas through one or more lance nozzles to mainly remove the Si and simultaneously discharge the slag. Ta. Or the position where the slag floats or after the slag floats after mainly dephosphorizing by blowing the powder of the dephosphorizing agent into the hot metal with a carrier gas through one or more lance nozzles that are immersed in the hot metal. The second step involves bubbling gas by blowing it through a lance nozzle immersed in the position of The slag is added to the top of the hot metal and is removed by stirring as it falls from the pouring gutter to the torpedo car or hot metal ladle.The generated desulfurized slag is rolled while covering the surface of the hot metal in the torpedo car or hot metal ladle to prevent heat radiation of the hot metal. A hot metal pretreatment method characterized by comprising a third step in which the hot metal is sent to the front of the furnace and then discharged, and (3) the upper limit amount of the treatment agent injected from one lance nozzle is set at 25 kg/t, and For the above blowing amount, the hot metal pretreatment method described in (1) and (2) above is characterized in that a plurality of lances are used and the lances are blown at intervals of 1.0 m or more.
作用 以下本発明の詳細な説明する。action The present invention will be explained in detail below.
本発明者らは、鋳床樋での粉体吹込による脱Ｓｉ処理、
脱Ｐ処理の試験を鋭意推進した結果、脱Ｓｒ処理、脱Ｐ
処理とし、未反応の酸化鉄がスラグ中に１０５以上の（
Ｆｅｔｅ）として残留しており、しかも樋長さ方向にて
溶銑試料を採取し、［Ｓｉｌ又は［Ｐ］の推移をみても
粉体の吹込位置から約１ｍ以上ではあまり変化がないこ
とがわかった。The present inventors performed a Si removal process by blowing powder in a cast bed gutter,
As a result of earnestly promoting tests on P removal treatment, we have achieved Sr removal treatment and P removal treatment.
treatment, unreacted iron oxide is present in the slag with a concentration of 105 or more (
Furthermore, hot metal samples were collected along the length of the gutter, and when looking at the changes in [Sil or P], it was found that there was no significant change over approximately 1 m from the powder injection position. .
したがって反応効率を上げる方法として、粉体を溶銑中
に極力深く吹込み、浮上中の反応時間を長くすること、
粉体の粒径を気泡から脱出できる範囲で極力小さくシ１
反反応面積を上げること、粉体の凝集合体を防止するよ
うランス羽口間隔を離す、あるいはランス羽口１個当り
の吹込粉体量を制限すること等の対策と同時に、浮上後
スラグの再利用を図ることが重要であることがわかった
。Therefore, one way to increase the reaction efficiency is to inject the powder into the hot metal as deeply as possible and lengthen the reaction time during floating.
The particle size of the powder is made as small as possible within the range that allows it to escape from the air bubbles.
At the same time as measures such as increasing the reaction area, increasing the distance between lance tuyeres to prevent powder agglomeration, or limiting the amount of powder blown per lance tuyere, it is possible to regenerate slag after floating. We learned that it is important to make use of it.
そこで、本発明者らはスラグの浮上後の位置において、
ランスノズルを浸漬し、ガスによるバブリングを行なっ
たところ、脱Ｓｉ処理後では脱Ｓｉ反応効率は向上する
が、復Ｐすることによって本来脱Ｓｉと同時にかなり起
こる脱Ｐがみられなくなること、脱Ｐ処理後では脱Ｐ反
応効率を向上させることがわかった。Therefore, the present inventors determined that the position of the slag after it floated was
When the lance nozzle was immersed and gas was bubbled, it was found that the efficiency of the Si removal reaction improved after the Si removal treatment, but that the dephosphorization that normally occurs at the same time as the dephosphorization was not observed, and that It was found that the dephosphorization reaction efficiency was improved after the treatment.
図面に脱Ｐ処理時のスラグメタルＰ分配値に及ぼすガス
バブリングの影響を示す、ガスバブリンクによりスラグ
メタルＰ分配値が向−Ｈし、脱Ｐ反応がより進行してい
ることがわかる。The figure shows the influence of gas bubbling on the slag metal P distribution value during the dephosphorization process. It can be seen that the gas bubbling link causes the slag metal P distribution value to move in the direction of -H, indicating that the dephosphorization reaction is progressing more.
すなわち低燐溶銑をつくる上で、脱Ｓｉ処理後のバブリ
ングは不適当であり、脱Ｐ処理掻のバブリングは効果が
あるという重要な知見が明らかとなった。In other words, important findings have been made that bubbling after the Si-removal treatment is inappropriate for producing low-phosphorus hot metal, and bubbling during the P-removal treatment is effective.
本発明者らの実験で脱Ｓｉ処理時にかなりの脱Ｐが同時
に起こることがわかったが、脱Ｓｉ処理後のバブリング
により脱Ｐがみられなくなる理由としては、高酸素ポテ
ンシャル又は何らかの脱Ｐ促進反応で起こった脱Ｐが（
１）、（２）式のように生成したＰ？への還元反応によ
って溶銑中に復Ｐするためと考えられる。The inventors' experiments have shown that a considerable amount of P removal occurs simultaneously during the Si removal process, but the reason why no P removal is observed due to bubbling after the Si removal process is due to a high oxygen potential or some kind of deP promotion reaction. The withdrawal from P that occurred in (
P? generated as in equations 1) and (2)? This is thought to be because P is returned to the hot metal by the reduction reaction to .
２Ｐ２へ＋５９ｉ → ５ＳｉＯ２＋４Ｐ ・・・
（１）Ｐ２０ｇ＋５Ｃ→ ５ＧＯ＋２Ｐ
・ 拳 ・ （２）脱Ｐ処理時に（１）、（２）式の
ような復Ｐ反応が起こらず、ざらに脱Ｐ反応が進む理由
としては、脱Ｓｉ処理時に比べ溶銑中のＳｉが比較的少
ないこと、又生成したスラグの塩基度が比較的高いため
と考えられる。+59i to 2P2 → 5SiO2+4P...
(1) P20g+5C→ 5GO+2P
・ Fist ・ (2) The reason why the dephosphorization reaction does not occur as shown in equations (1) and (2) during the dephosphorization process and the dephosphorization reaction progresses more or less is that the Si in the hot metal is lower than during the desiliconization process. This is thought to be due to the fact that there are few targets and the basicity of the generated slag is relatively high.
なお脱Ｐ処理後のバブリングは、溶銑中に深く浸漬した
ランスノズルから、はぼ０．５〜５ （Ｎｒｎ”／ｔ）
で吹込むのが良く、あまりガス量が多いと溶銑樋内での
溶銑の揺動が激しく、飛散するし、又ガス量が少ないと
反応促進効果が低下する。なおガスの種類としてはＡｒ
、Ｎ２等の不活性ガスの他、空気、酸素等いずれでもよ
い。The bubbling after deP treatment is approximately 0.5 to 5 (Nrn"/t) from the lance nozzle deeply immersed in the hot metal.
If the amount of gas is too large, the hot metal will shake violently in the hot metal gutter and scatter, and if the amount of gas is too small, the reaction promotion effect will be reduced. The type of gas is Ar.
In addition to inert gases such as , N2, air, oxygen, etc. may be used.
また、脱Ｐ処理後のスラグメタルの攪拌方法として、上
記ガスバブリングが最も容易であるが。Furthermore, as a method of stirring the slag metal after deP treatment, the above-mentioned gas bubbling is the easiest method.
羽根車等による機械攪拌でも同様な反応促進効果がある
。Mechanical stirring using an impeller or the like has a similar reaction promoting effect.
なお以上の方法により低燐溶銑が容易にできるが、低燐
、極低硫溶銑をつくる場合、高炉鋳床の溶銑樋の傾注樋
前にて脱Ｓ剤の粉体を自然落下により溶銑面上に添加し
、溶銑樋から傾注樋さらにトピードカー又は溶銑鍋へ落
下する時の攪拌によって脱Ｓし、生成した脱Ｓスラグは
溶銑の放熱防止のためトピードカー又は溶銑鍋の溶銑面
を覆ったまま、転炉前まで送られ、その後排出される工
程を脱Ｓｉ工程、さらに脱Ｐ工程の後に行なうことによ
って容易に可能である。Although low-phosphorus hot metal can be easily produced by the above method, when producing low-phosphorus and extremely low-sulfur hot metal, powder of the desulfurization agent is allowed to fall naturally onto the surface of the hot metal in front of the tilting gutter of the hot metal gutter in the blast furnace casthouse. The de-S slag is added to the molten pig iron, and is removed by stirring as it falls from the pouring culvert to the torpedo car or hot metal ladle. This is easily possible by carrying out the step of sending the material to the front of the furnace and then discharging it after the Si removal step and further the P removal step.
又木発明者らが特願昭Ｅｌｆ−２１２８０２にて開示し
たように、鋳床樋での粉体吹込による溶銑予備処理の場
合１反応効率を上げるためには、１個のランスノズルか
ら吹込む処理剤の上限量を２５ｋｇ／ｔと定め、それを
越える吹込量に対しては、複数個のランスを用いて各々
のランス間隔を１．０ｍ以上離して吹込むことが重要で
あり、この技術を本発明に取り入れることによって、効
果がさらに大きくなる。As disclosed by the inventors of Mataki in Japanese Patent Application Sho Elf-212802, in the case of pre-treatment of hot metal by blowing powder in the cast bed gutter, in order to increase the reaction efficiency, it is necessary to blow from one lance nozzle. The upper limit of the treatment agent amount is set at 25 kg/t, and for blowing amounts exceeding that, it is important to use multiple lances and keep each lance spaced at least 1.0 m apart. By incorporating this into the present invention, the effect becomes even greater.
実施例 以下本発明を実施例に基づき説明する。Example The present invention will be explained below based on examples.
第１表に示す比較例１は、鋳床樋での溶銑面上からの粉
体吹付による脱Ｓｉ、脱Ｐ（脱Ｓ）処理の結果であり、
脱Ｓｉ剤原単位３０（ｋｇ／ｔ）、脱Ｐ剤原単位４０（
ｋｇ／ｔ）で、出銑［Ｐ］が０．１００％から処理後［
Ｐ］ ０．０２５％に脱Ｐされているが、低燐銑（［Ｐ
］≦ｏ、ｏｔｏ％）は得られていない。Comparative Example 1 shown in Table 1 is the result of deSi and deP (deS) treatment by powder spraying from the surface of hot metal in the cast bed gutter,
Desiliconizing agent basic unit: 30 (kg/t), P dephosphorizing agent basic unit: 40 (kg/t)
kg/t), tap iron [P] is from 0.100% to after treatment [
P] It has been dephosphorized to 0.025%, but low phosphorus pig iron ([P
]≦o, oto%) was not obtained.
一方、第２表に示す実施例は、脱Ｓｉ処理、脱Ｐ処理と
も鋳床溶銑樋において、溶銑内に粉体吹込して処理し、
同時に排滓した後、！８床溶銑樋の傾注樋前にて脱Ｓ剤
を溶銑上方から自然落下によって添加し、傾注樋さらに
トピードカー等の容器への落下時の攪拌混合によって脱
Ｓ反応を促進させ、スラグは転炉前にて排滓した場合で
あり、特に脱Ｐ処理後溶銑内に浸漬させたランスノズル
からＡｒバブリング（約ＩＮｍ″／１）を行なった例で
ある。比較例１と同様な出銑成分のものが同じ脱Ｓｉ剤
原単位、脱Ｐ剤原単位で、脱Ｐ処理後の［Ｐ］は０．０
０７％と明らかに比較例１のバブリングを行なわなかっ
た場・合に比べ、脱Ｐ効率は高くなっており、低燐銑が
得られていることがわかる。ざらに脱Ｐ処理後の脱Ｓ処
理により、極低硫の［Ｓ］０．００７％の溶銑になって
いることがわかる。On the other hand, in the examples shown in Table 2, both the Si-removal treatment and the P-removal treatment were performed by injecting powder into the hot metal in the cast bed hot metal trough.
After removing the slag at the same time! The desulfurization agent is added by gravity from above the hot metal in front of the tilting gutter of the 8-bed hot metal gutter, and the desulfurization reaction is promoted by stirring and mixing when the hot metal falls into the tilting gutter and then into a container such as a torpedo car. In particular, this is an example in which Ar bubbling (approximately INm''/1) was performed from a lance nozzle immersed in hot metal after deP treatment.The same tapping components as in Comparative Example 1 are the same de-Si agent unit and de-P agent unit, and [P] after de-P treatment is 0.0
It can be seen that the P removal efficiency is clearly higher than that of Comparative Example 1 in which bubbling was not performed, which was 0.7%, and that low phosphorus pig iron was obtained. It can be seen that the sulfur removal treatment after the rough deP treatment resulted in hot metal with an extremely low sulfur content of 0.007% [S].
また第３表に示す比較例２は、比較例１と同様の方法で
あるが、異なっている点は脱Ｓｉ処理後、脱Ｐ処理後に
、ともにＡｒバブリング（１，５Ｎｍ”／ｔ）を行なっ
ており、この場合脱Ｐ処理時の反応効率は実施例と同様
高いものの、脱Ｓｉ処理時の脱Ｐがないことによって脱
Ｐ処理前の［Ｐ］が高く、結果的に脱Ｐ処理後の［Ｐ］
は、比較例１、実施例と同じフラックス原単位で０．０
３０％で低燐溶銑とはなっていない。Comparative Example 2 shown in Table 3 uses the same method as Comparative Example 1, but the difference is that Ar bubbling (1.5 Nm''/t) was performed after the Si removal treatment and the P removal treatment. In this case, although the reaction efficiency during the P removal process is high as in the example, the [P] before the P removal process is high due to the lack of P removal during the Si removal process, and as a result, the [P] after the P removal process is high. [P]
is 0.0 at the same flux consumption rate as Comparative Example 1 and Example.
At 30%, it is not low phosphorus hot metal.
なお上記比較例、実施例の粉体吹込については、いずれ
もランスノズル１個あたりの処理材の吹込量は２５ｋｇ
／を未満であり、又、ランス羽口の間隔は １．０ｍ以
上離した条件で行なった。Regarding powder injection in the above comparative examples and examples, the amount of treated material blown per lance nozzle was 25 kg.
The testing was conducted under the conditions that the lance tuyeres were spaced at least 1.0 m apart.
（以下余白）
発明の効果
本発明により、安価で効率のよい鋳床溶銑予備処理が可
能となった。(Hereinafter in the margin) Effects of the Invention The present invention has made it possible to pre-treat casthouse hot metal at low cost and with high efficiency.
図面は、スラグメタルＰ分配値とスラグの塩基度との関
係を示す図である。The drawing is a diagram showing the relationship between the slag metal P distribution value and the basicity of slag.
Claims (4)
又は溶銑中に浸漬して設置された、１個又は複数個のラ
ンスノズルを通じて、脱Ｓｉ剤の粉体をキャリアガスに
て溶銑中に吹込んで脱Ｓｉし、引続き排滓する第一工程
と、高炉鋳床の溶銑樋において溶銑上に設置された、又
は溶銑中に浸漬して設置された、１個又は複数個のラン
スノズルを通じて脱Ｐ剤の粉体をキャリアガスにて溶銑
中に吹込んで脱Ｐした後、スラグが浮上する位置又は浮
上後の設置に浸漬させたランスノズルからガスを吹込ん
でバブリングを行ない、ついで排滓する第二工程からな
ることを特徴とする溶銑予備処理法。(1) Installed above the hot metal in the hot metal gutter of the blast furnace casthouse,
or a first step of blowing powder of a desiliconizing agent into the hot metal with a carrier gas to remove the Si through one or more lance nozzles installed immersed in the hot metal, and subsequently removing the slag; Powder of the dephosphorizing agent is blown into the hot metal using a carrier gas through one or more lance nozzles installed above the hot metal or immersed in the hot metal in the hot metal trough of the blast furnace casthouse. A hot metal pretreatment method characterized by comprising a second step of bubbling gas by blowing gas from a lance nozzle immersed at a position where the slag floats or after it floats after dephosphorization, and then discharging the slag.
又は溶銑中に浸漬して設置された、１個又は複数個のラ
ンスノズルを通じて、脱Ｓｉ剤の粉体をキャリアガスに
て溶銑中に吹込んで脱Ｓｉし、引続き排滓する第一工程
と、高炉鋳床の溶銑樋において溶銑上に設置された、又
は溶銑中に浸漬して設置された、１個又は複数個のラン
スノズルを通じて脱Ｐ剤の粉体をキャリアガスにて溶銑
中に吹込んで脱Ｐした後、スラグが浮上する位置又は浮
上後の位置に浸漬させたランスノズルからガスを吹込ん
でバブリングを行ない、ついで排滓する第二工程と、高
炉鋳床の溶銑樋の傾注樋前にて脱Ｓ剤の粉体を自然落下
により溶銑面上に添加し、溶銑樋から傾注樋さらにトピ
ードカー又は溶銑鍋へ落下する時の攪拌によって脱Ｓし
、生成した脱Ｓスラグは溶銑の放熱防止のためトピード
カー又は溶銑鍋の溶銑面を覆ったまま転炉前まで送られ
、その後排出される第三工程からなることを特徴とする
溶銑予備処理法。(2) Installed above the hot metal in the hot metal gutter of the blast furnace casthouse,
or a first step of blowing powder of a desiliconizing agent into the hot metal with a carrier gas to remove the Si through one or more lance nozzles installed immersed in the hot metal, and subsequently removing the slag; Powder of the dephosphorizing agent is blown into the hot metal using a carrier gas through one or more lance nozzles installed above the hot metal or immersed in the hot metal in the hot metal trough of the blast furnace casthouse. After dephosphorizing, the second process involves bubbling gas by blowing gas through a lance nozzle immersed in the position where the slag floats or the position after floating, and then discharging the slag, and before the tilting gutter of the hot metal gutter in the blast furnace casthouse. The powder of the desulfurization agent is added onto the surface of the hot metal by gravity, and the desulfurization agent is removed by stirring as it falls from the hot metal gutter to the tilting gutter and then to the torpedo car or hot metal ladle. A hot metal pretreatment method comprising a third step in which the hot metal is sent to the front of the converter with the surface of the hot metal covered in a torpedo car or hot metal ladle, and then discharged.
２５ｋｇ／ｔと定め、それを越える吹込量の場合には、
複数個のランスを用いて各々のランス間隔を１．０ｍ以
上離して吹込むことを特徴とする特許請求の範囲第１項
記載の溶銑予備処理法。(3) The upper limit of the amount of processing agent blown from one lance nozzle is set at 25 kg/t, and if the amount blown exceeds that,
2. The hot metal pretreatment method according to claim 1, wherein the blowing is carried out using a plurality of lances with a spacing of 1.0 m or more between each lance.
２５ｋｇ／ｔと定め、それを越える吹込量の場合には、
複数個のランスを用いて各々のランス間隔を１．０ｍ以
上離して吹込むことを特徴とする特許請求の範囲第３項
記載の溶銑予備処理法。(4) The upper limit of the amount of processing agent blown from one lance nozzle is set at 25 kg/t, and if the amount blown exceeds that,
4. The hot metal pretreatment method according to claim 3, characterized in that the blowing is carried out using a plurality of lances with the intervals between each lance being 1.0 m or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7155487A JPS63238207A (en) | 1987-03-27 | 1987-03-27 | Method for pretreating molten iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7155487A JPS63238207A (en) | 1987-03-27 | 1987-03-27 | Method for pretreating molten iron |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63238207A true JPS63238207A (en) | 1988-10-04 |
Family
ID=13464064
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7155487A Pending JPS63238207A (en) | 1987-03-27 | 1987-03-27 | Method for pretreating molten iron |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63238207A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6035408A (en) * | 1983-08-05 | 1985-02-23 | ニチコン株式会社 | Electrically insulating oil |
| JPS60208408A (en) * | 1984-03-30 | 1985-10-21 | Kawasaki Steel Corp | Method and device for continuous treatment of molten iron |
| JPS61149416A (en) * | 1984-12-24 | 1986-07-08 | Sumitomo Metal Ind Ltd | Pretreatment of molten pig iron |
-
1987
- 1987-03-27 JP JP7155487A patent/JPS63238207A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6035408A (en) * | 1983-08-05 | 1985-02-23 | ニチコン株式会社 | Electrically insulating oil |
| JPS60208408A (en) * | 1984-03-30 | 1985-10-21 | Kawasaki Steel Corp | Method and device for continuous treatment of molten iron |
| JPS61149416A (en) * | 1984-12-24 | 1986-07-08 | Sumitomo Metal Ind Ltd | Pretreatment of molten pig iron |
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