JPH086132B2 - Slag coating method for steelmaking converter - Google Patents
Slag coating method for steelmaking converterInfo
- Publication number
- JPH086132B2 JPH086132B2 JP63247406A JP24740688A JPH086132B2 JP H086132 B2 JPH086132 B2 JP H086132B2 JP 63247406 A JP63247406 A JP 63247406A JP 24740688 A JP24740688 A JP 24740688A JP H086132 B2 JPH086132 B2 JP H086132B2
- Authority
- JP
- Japan
- Prior art keywords
- amount
- slag
- converter
- hot metal
- blowing
- 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
- 239000002893 slag Substances 0.000 title claims description 58
- 238000000576 coating method Methods 0.000 title claims description 20
- 238000009628 steelmaking Methods 0.000 title claims 3
- 238000007664 blowing Methods 0.000 claims description 33
- 239000002184 metal Substances 0.000 claims description 27
- 229910052751 metal Inorganic materials 0.000 claims description 27
- 229910000514 dolomite Inorganic materials 0.000 claims description 24
- 239000010459 dolomite Substances 0.000 claims description 24
- 239000011248 coating agent Substances 0.000 claims description 13
- 238000010079 rubber tapping Methods 0.000 claims description 9
- 239000011261 inert gas Substances 0.000 claims description 3
- 238000007670 refining Methods 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical group [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000007423 decrease Effects 0.000 description 4
- 238000010828 elution Methods 0.000 description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 3
- 235000011941 Tilia x europaea Nutrition 0.000 description 3
- 239000011247 coating layer Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000004571 lime Substances 0.000 description 3
- 238000002203 pretreatment Methods 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 2
- 235000012255 calcium oxide Nutrition 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005987 sulfurization reaction Methods 0.000 description 1
Landscapes
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Description
【発明の詳細な説明】 ＜産業上の利用分野＞ 本発明は、転炉において底吹羽口や内張耐火物を保護
して羽口や内張耐火物の寿命を延長させるスラグコーテ
ィング方法に関するものである。Description: TECHNICAL FIELD The present invention relates to a slag coating method for protecting a bottom blowhole and a lining refractory in a converter to extend the life of the tuyere and the lining refractory. It is a thing.
＜従来の技術＞ 従来の非予備処理溶銑を使用した全底吹転炉の低炭素
鋼の吹錬では、脱Ｐのために使用する焼石灰量が多く、
生成スラグを出鋼後排滓せずに炉内に残した場合、少量
・一定量の生ドロマイトの投入では、スラグ固化状況
は、焼石灰原単位や吹止Ｃ濃度等により異なりコーティ
ングスラグが確実には固化しなかった（第２図参照）。
そこで、一部排滓を行って炉内残存スラグ量を減少させ
てから生ドロマイトおよび／もしくは軽焼ドロマイトを
投入し、スラグコーティングを行っていた。しかしこの
方法では、炉内残存スラグ量はオペレータの勘によりコ
ントロールされるのでバラツキが大きく、かつ必要以上
に多くなる傾向にある。そのため多量に投入した生ドロ
マイトが炉内残存スラグのなかで部分的に固まり、適正
な量のMgOが均質に分散した質のよいスラグコーティン
グ層が得られないという欠点があった。<Prior Art> In the blowing of low carbon steel in a conventional bottom-blown converter using non-preliminary hot metal, a large amount of calcined lime is used for P removal.
When the produced slag is left in the furnace without being slagged after tapping, when a small amount of a fixed amount of raw dolomite is added, the slag solidification status varies depending on the burnt lime unit and blowout C concentration, etc. It did not solidify (see Figure 2).
Therefore, some slag was removed to reduce the amount of slag remaining in the furnace, and then raw dolomite and / or light burned dolomite were added to perform slag coating. However, with this method, the amount of residual slag in the furnace is controlled by the operator's intuition, so there is a large variation, and there is a tendency for it to increase more than necessary. Therefore, a large amount of raw dolomite was partially solidified in the residual slag in the furnace, and it was not possible to obtain a good quality slag coating layer in which an appropriate amount of MgO was uniformly dispersed.
＜発明が解決しようとする課題＞ 本発明は、以上のような従来のスラグコーティング方
法の欠点に鑑み、予備処理溶銑を使用した吹錬では、脱
Ｐのために使用される焼石灰量が少なく、生成スラグ量
が少ない点に着目して、炉内残存スラグ量の大きいバラ
ツキと投入MgO分量の不適正、投入MgO分の残存スラグ中
への不均一分散およびスラグの部分的凝固による不均質
なスラグコーティング層の生成を防止できるようなスラ
グコーティング方法を提供するためになされたものであ
る。<Problems to be Solved by the Invention> In view of the above-mentioned drawbacks of the conventional slag coating method, the present invention uses a small amount of calcined lime used for de-Ping in blowing using pre-treated hot metal. Focusing on the fact that the amount of generated slag is small, there is a large variation in the amount of residual slag in the furnace and an inappropriate amount of input MgO, uneven distribution of the input MgO in the residual slag, and inhomogeneity due to partial solidification of the slag. The purpose of the present invention is to provide a slag coating method capable of preventing the formation of a slag coating layer.
＜課題を解決するための手段＞ 本発明は、脱Si,脱Ｐおよび脱Ｓをした予備処理溶銑
を転炉で吹止めスラグ中total Feが平均16重量％（以下
％と略す）以下の条件で吹錬する場合にあって、当該ヒ
ートの溶銑Ｐが0.05％以下のときには、出鋼後、精錬ス
ラグを排滓せず全量を炉内に残し、次回吹錬予定の溶銑
Ｐ濃度に応じて、下記の表10に示す必要最少限量以上の
MgO量を生ドロマイトおよび／もしくは軽焼ドロマイト
として炉内に装入してスラグコーティングすることによ
って、前記課題を解決したものである。<Means for Solving the Problems> In the present invention, the total Fe in the slag blown by the pre-treatment hot metal that has undergone de-Si, de-P, and de-sulfurization in the converter is not more than 16% by weight (hereinafter abbreviated as%) on average. When the hot metal P of the heat is less than 0.05%, the total amount of the refining slag is not discharged and the whole amount is left in the furnace after tapping, depending on the concentration of hot metal P to be blown next time. , The required minimum amount or more shown in Table 10 below
The above problem is solved by charging the amount of MgO as raw dolomite and / or lightly burned dolomite into a furnace and performing slag coating.
本発明においては、前記転炉が、全底吹き転炉、床吹
きO2量約0.8〜1.0Nm3/分・ｔの上底吹き転炉、吹錬末期
底吹き不活性ガス量が0.10Nm3/分・ｔ以上の上底吹き転
炉のいずれかの転炉であることが好ましい。 In the present invention, the converter is a full bottom blowing converter, a floor blowing O 2 amount of about 0.8 ~ 1.0 Nm 3 / min · t top bottom blowing converter, final blowing bottom blowing inert gas amount of 0.10 Nm It is preferable that the converter is any one of the top-bottom blowing converter of 3 / min · t or more.
＜作用＞ 本発明では、溶銑Ｐが0.05重量％（以下％と略す）以
下の場合に吹錬終了出鋼後、精錬スラグを排滓せず全量
炉内に残したので、従来のようにスラグの炉内残存量の
コントロールをオペレータの勘に頼ることはなくなり、
残存スラグ量のバラツキが過大になることはなく、かつ
均質なスラグコーティングに必要なスラグ量が確保され
る。<Operation> In the present invention, when the hot metal P is 0.05% by weight (hereinafter abbreviated as “%”) or less, after the completion of the blowing operation, the entire amount of the refining slag is left in the furnace without being discharged. No longer relying on the operator's intuition to control the remaining amount in the furnace
The variation of the residual slag amount does not become excessive, and the slag amount required for uniform slag coating is secured.
また、スラグコーティングに当たって次回吹錬予定の
溶銑Ｐ濃度に応じて、内張耐火物からMgOが溶出しない
必要最少限のMgO量を計算し、これを生ドロマイトおよ
び／もしくは軽焼ドロマイトとして炉内に投入するの
で、均質にMgOが分散され、また次回の吹錬スラグ中のM
gO濃度が適正に確保され内張耐火物からのMgO溶出はな
くなり、損耗速度が小さくなる。In addition, in the slag coating, the minimum required MgO amount that does not elute MgO from the lining refractory is calculated according to the hot metal P concentration to be blown next time, and this is put into the furnace as raw dolomite and / or light burned dolomite. Since it is charged, MgO is dispersed uniformly, and M in the next blown slag is
The gO concentration is properly secured, MgO elution from the refractory lining disappears, and the wear rate decreases.
以下に本発明の作用をさらに詳細に説明する。 The operation of the present invention will be described in more detail below.
230t全底転炉を用い、吹止めC:0.02〜0.05％，出鋼温
度:1615℃，吹止めスラグ中total Fe:平均14.0％の条件
での実験によれば、溶銑Ｐが0.05％以下の予備処理溶銑
の脱炭吹錬を行った場合において、生成スラグを排滓せ
ずに全量炉内に残し、生ドロマイトまたは軽焼ドロマイ
トを投入してスラグコーティングを行った場合、スラグ
コーティング時の投入MgO量と次回吹錬時の内張耐火物
からのMgOの溶出量（ΔMgO）との間には次回吹錬予定の
溶銑Ｐ濃度をパラメータとして第３図に示すような関係
があるとの知見を得た。According to the experiment using 230t full bottom converter, blowing stop C: 0.02 to 0.05%, tapping temperature: 1615 ℃, total Fe in blowing stop slag: average 14.0%, the hot metal P content is 0.05% or less. When decarburization blowing of pre-treatment hot metal is carried out, if the amount of slag produced is not left in the furnace but left in the furnace and raw dolomite or light burned dolomite is added for slag coating, input at the time of slag coating Finding that there is a relationship between the amount of MgO and the elution amount of MgO from the refractory lining during the next blowing (ΔMgO) with the concentration of hot metal P scheduled for the next blowing as a parameter as shown in Fig. 3. Got
ここでΔMgO（溶出量）の定義は以下の通りである。 Here, the definition of ΔMgO (elution amount) is as follows.
ΔMgO＝インプットMgO−アウトプットMgO なお、生成スラグ原単位は生成スラグのCaO濃度を分
析し、CaOバランスから求めた。ΔMgO = Input MgO-Output MgO The basic unit of generated slag was calculated from the CaO balance by analyzing the CaO concentration of the generated slag.
ΔMgOがプラスの時は耐火物からMgOが溶出せず、ΔMg
Oがマイナスの時は内張耐火物からMgOが溶出しているこ
とになる。When ΔMgO is positive, MgO does not elute from the refractory and ΔMgO
When O is negative, it means that MgO is eluted from the refractory lining.
第３図から、次回吹錬の溶銑Ｐが0.05％以下では、底
吹羽口や内張耐火物からMgOが溶出しないためには生ド
ロマイトおよび／もしくは軽焼ドロマイト中からのMgO
分は次回の溶銑Ｐ濃度に応じて第１表に示す最低量が必
要であることがわかる。From Fig. 3, when the content of hot metal P in the next blowing is less than 0.05%, MgO does not elute from the bottom blowing tuyeres and the lining refractory, so MgO from the raw dolomite and / or lightly burned dolomite
It is understood that the minimum amount is required as shown in Table 1 depending on the next hot metal P concentration.
溶銑Ｐが0.05％以下の場合は、脱Ｐのため使用する焼
石灰量が減少することによって生成スラグ量が減少する
が、生ドロマイトもしくは軽焼ドロマイト使用量も次回
吹錬溶銑Ｐ濃度に応じて最低限第１表に示す量が必要と
なる。When the hot metal P content is 0.05% or less, the amount of slag produced decreases due to the decrease in the amount of calcined lime used for dephosphorization, but the amount of raw dolomite or lightly burned dolomite used also depends on the concentration of the next blown hot metal P. The minimum amount shown in Table 1 is required.
なお、底吹O2量約0.8〜1.0Nm3/分・ｔの250t上底吹転
炉および、吹錬末期底吹き不活性ガス量が0.10Nm3/分・
ｔ以上の180t上底不転炉で、不止めC:0.03〜0.07％，出
鋼温度:1630〜1670℃，吹止めスラグ中total Fe:15〜16
％の条件で予備処理溶銑を吹錬した場合も第３図および
第１表とほぼ同じ結果が得られ、吹止めスラグ中total
Feが平均16％以下の上底吹転炉その他の転炉における溶
銑吹錬にも本発明方法が適用できることが判った。 In addition, the bottom blowing O 2 amount is about 0.8-1.0 Nm 3 / min ・ t of 250t top-bottom blowing converter with t, and the bottom blowing inert gas amount at the end of blowing is 0.10 Nm 3 / min ・
180t top-bottom converter with a temperature of at least t, non-stop C: 0.03 to 0.07%, tapping temperature: 1630 to 1670 ℃, total Fe in blow slag: 15 to 16
When the pre-treated hot metal was blown under the condition of%, almost the same result as in Fig. 3 and Table 1 was obtained, and
It was found that the method of the present invention can also be applied to hot metal blowing in an upper-bottom blowing converter having an average Fe content of 16% or less and other converters.
以上のことから溶銑Ｐが0.05％以下の場合には、生成
スラグ量が減少するので、出鋼後精錬スラグを排滓せず
に全量残し、さらに次回吹錬溶銑Ｐ濃度に応じて内張耐
火物からMgOが溶出しない必要最低限の投入MgO分を生ド
ロマイトおよび／もしくは軽焼ドロマイトとして炉内に
投入してスラグコーティングを行い内張耐火物からのMg
O溶出を防止することによって内張耐火物や底吹羽口の
寿命を延長できる。From the above, when the molten iron P content is 0.05% or less, the amount of slag produced decreases, so the entire amount of slag is left after smelting without being slagged. MgO does not elute from the material. The minimum required MgO content is charged as raw dolomite and / or light burned dolomite into the furnace for slag coating and Mg from the lining refractory material.
By preventing O elution, the life of the refractory lining and bottom blowhole can be extended.
＜実施例＞ 本発明に係る具体的実施例を以下に説明する。<Examples> Specific examples according to the present invention will be described below.
実施手順、すなわち操業方法はつぎのとおりである。 The implementation procedure, that is, the operation method is as follows.
吹錬始→吹錬終→出鋼→（排滓せず）→生ドロマイト添
加（次回溶銑Ｐに応じた量）→スラグコーティング→溶
銑装入→吹錬始。Blowing start → Blowing end → Steel tapping → (No slag) → Addition of raw dolomite (amount according to the next hot metal P) → Slag coating → Hot metal charging → Blowing start
第１図および第２表は、230t全底吹転炉における本発
明のスラグコーティング方法、すなわち次回溶銑P0.05
％以下の場合、前ヒート出鋼後排滓なしで生ドロマイト
を最低限第１表に示す量をスラグに添加してスラグコー
ティングをしたヒートの全吹錬ヒートに体する比率、す
なわち本発明方法実施率と、底吹羽口の損耗速度との関
係を示したものである。なお、ボトム内張耐火物はMgO
−Ｃレンガ（MgO:80％,C:20％），平均出鋼温度:1615
℃，平均吹止めスラグ中total Fe:14％の条件で２炉代
約5000ヒートのデータについて解析した。この図および
表から明らかなように排滓なしでスラグコーティングを
行うと羽口の溶損速度が小さくなった。Fig. 1 and Table 2 show the slag coating method of the present invention in a 230t full bottom blowing converter, that is, the next hot metal P0.05.
When the amount is less than or equal to%, the ratio of raw dolomite added to the slag in the minimum amount shown in Table 1 without slag after pre-heat tapping, which is the ratio of the slag-coated heat to the total blowing heat, that is, the method of the present invention It shows the relationship between the implementation rate and the wear rate of the bottom blowhole. The bottom lined refractory is MgO
-C brick (MgO: 80%, C: 20%), average tapping temperature: 1615
Approximately 5,000 heat data for two furnaces were analyzed under the conditions of ℃ and total Fe: 14% in the average blowout slag. As is clear from this figure and table, the erosion rate of tuyere decreased when slag coating was performed without slag.
＜発明の効果＞ 本発明は、溶銑Ｐが0.05％以下の予備処理溶銑で吹錬
を行った場合に、出鋼後全く排滓をせずに次回の溶銑Ｐ
濃度に応じて、コーティングされるスラグ中のMgO量が
内張耐火物からMgOが溶出しない必要最少限量以上のMgO
量となるように生ドロマイトおよび／もしくは軽焼ドロ
マイトを投入してスラグコーティングをするようにした
ので、次回吹錬スラグ中の必要なMgO量が適正に確保さ
れかつ均質なスラグコーティング層が形成され、羽口の
損耗速度や炉壁耐火物の損耗速度を小さくすることがで
きるようになった。 <Effects of the Invention> The present invention shows that when the pre-treatment hot metal having a hot metal P content of 0.05% or less is blown, the next hot metal P is not discharged at all after tapping.
Depending on the concentration, the amount of MgO in the coated slag does not elute from the refractory lining.
The amount of MgO required in the next blown slag is properly secured and a uniform slag coating layer is formed because the raw dolomite and / or the light-burnt dolomite are added to adjust the amount to perform the slag coating. , The tuyere wear rate and furnace wall refractory wear rate can be reduced.
第１図は、本発明方法実施率と羽口損耗速度との関係を
示す特性図、第２図は、全底吹き転炉で非予備処理溶銑
を使用して低炭素鋼を吹錬後排滓せずに一定原単位の生
ドロマイトを投入してスラグコーティングした場合の当
該ヒートの焼石灰原単位，吹止Ｃ濃度とコーティングス
ラグの固化状況を示す特性図、第３図は、次回吹錬の溶
銑Ｐ濃度をパラメータとした投入ドロマイト中MgO量と
ΔMgO（耐火物などからの溶出MgO量）との関係を示す特
性図である。FIG. 1 is a characteristic diagram showing the relationship between the implementation rate of the method of the present invention and the tuyere wear rate, and FIG. 2 is the exhaust after blowing low carbon steel using non-pretreated hot metal in a full bottom blowing converter. Characteristic diagram showing the burnt lime unit of the heat, blowout C concentration and the solidification status of the coating slag when slag coating is performed by adding a certain amount of raw dolomite without slag, Fig. 3 is the next blowing FIG. 3 is a characteristic diagram showing the relationship between the amount of MgO in input dolomite and ΔMgO (the amount of MgO eluted from refractory, etc.) with the hot metal P concentration as a parameter.
Claims (2)
を転炉で吹止めスラグ中total Feが平均16重量％以下の
条件で吹錬する場合にあって、当該ヒートの溶銑Ｐが0.
05重量％以下のときには、出鋼後、精錬スラグを排滓せ
ず全量を炉内に残し、次回吹錬予定の溶銑Ｐ濃度に応じ
て、下記の表に示す必要最少限量以上のMgO量を生ドロ
マイトおよび／もしくは軽焼ドロマイトとして炉内に装
入してスラグコーティングすることを特徴とする製鋼用
転炉のスラグコーティング方法。 1. When the pre-treated hot metal that has been subjected to Si removal, P removal and S removal is blown in a converter under the condition that the total Fe in blow-stop slag is 16 wt% or less on average, the hot metal P of the heat is Is 0.
When the amount is less than 05% by weight, after tapping, the entire amount of refining slag is not discharged and the entire amount is left in the furnace. Depending on the concentration of hot metal P to be blown next time, the amount of MgO above the minimum required amount shown in the table below is set. A slag coating method for a steelmaking converter, which comprises charging raw dolomite and / or light-burnt dolomite into a furnace for slag coating.
0.8〜1.0Nm3/分・ｔの上底吹き転炉、吹錬末期底吹き不
活性ガス量が0.10Nm3/分・ｔ以上の上底吹き転炉のいず
れかの転炉である請求項１に記載の製鋼用転炉のスラグ
コーティング方法。2. The converter is a full bottom blowing converter, bottom blowing O 2 amount
The converter is one of a bottom-blown converter with a bottom-blown converter of 0.8 to 1.0 Nm 3 / min · t, and a bottom-blown inert gas with a final blowing amount of 0.10 Nm 3 / min · t or more. 1. The slag coating method for a steelmaking converter according to 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63247406A JPH086132B2 (en) | 1988-10-03 | 1988-10-03 | Slag coating method for steelmaking converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63247406A JPH086132B2 (en) | 1988-10-03 | 1988-10-03 | Slag coating method for steelmaking converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0297612A JPH0297612A (en) | 1990-04-10 |
| JPH086132B2 true JPH086132B2 (en) | 1996-01-24 |
Family
ID=17162959
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63247406A Expired - Fee Related JPH086132B2 (en) | 1988-10-03 | 1988-10-03 | Slag coating method for steelmaking converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH086132B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04318114A (en) * | 1991-04-18 | 1992-11-09 | Nippon Steel Corp | Method for plugging bottom blowing tuyere in converter |
| JP3104386B2 (en) * | 1992-03-10 | 2000-10-30 | 株式会社ニコン | Surveying instrument |
| CN117535469B (en) * | 2023-11-16 | 2024-08-27 | 山东钢铁集团永锋临港有限公司 | Method for maintaining furnace conditions in low iron loss mode |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6156223A (en) * | 1984-08-24 | 1986-03-20 | Nippon Steel Corp | Method for coating converter with slag |
-
1988
- 1988-10-03 JP JP63247406A patent/JPH086132B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0297612A (en) | 1990-04-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |