JPH0578724A - Desulfurizing and desiliconizing methods on casting floor in blast furnace - Google Patents
Desulfurizing and desiliconizing methods on casting floor in blast furnaceInfo
- Publication number
- JPH0578724A JPH0578724A JP26854691A JP26854691A JPH0578724A JP H0578724 A JPH0578724 A JP H0578724A JP 26854691 A JP26854691 A JP 26854691A JP 26854691 A JP26854691 A JP 26854691A JP H0578724 A JPH0578724 A JP H0578724A
- Authority
- JP
- Japan
- Prior art keywords
- hot metal
- desiliconizing
- desulfurizing
- 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
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】この発明は溶銑の予備処理におい
て特に脱硫及び脱珪の効率向上を図る高炉鋳床脱硫脱珪
方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blast furnace cast bed desulfurization desiliconization method for improving the efficiency of desulfurization and desiliconization in the pretreatment of molten pig iron.
【0002】[0002]
【従来の技術】製鋼プロセスに先んじて溶銑の脱硫や脱
珪等の予備処理を行なう技術として、特開昭63−19
9813号では、図3に示される様に、高炉炉壁2aに設
けられた出銑口2から流出した溶銑1が溶銑樋3を流れる
間に、途中スキンマー4で混入した溶滓1aの除去を行な
い、その後噴射バーナランス9によりホッパ9aから供給
される予備処理剤をインジェクションする方法が開示さ
れている。2. Description of the Related Art As a technique for performing a pretreatment such as desulfurization and desiliconization of hot metal prior to a steelmaking process, Japanese Patent Laid-Open No. 63-19 is known.
In No. 9813, as shown in FIG. 3, while the molten pig iron 1 flowing out from the tap hole 2 provided in the blast furnace wall 2a flows through the molten pig iron gutter 3, the removal of the molten slag 1a mixed by the skinmer 4 is performed. There is disclosed a method in which the pretreatment agent supplied from the hopper 9a is injected by the injection burner lance 9 after that.
【0003】[0003]
【発明が解決しようとする課題】以上の方法で予備処理
剤としてミルスケールや砂鉄等の酸化物からなる脱珪剤
を用いて溶銑1の脱珪処理を行なう場合は、下式数1に
示される様に溶銑1中のSi成分の酸化反応が進行する。When the desiliconization treatment of the hot metal 1 is carried out by the above method using the desiliconization agent composed of oxides such as mill scale and iron sand as the pretreatment agent, the following formula 1 is used. As described above, the oxidation reaction of the Si component in the hot metal 1 proceeds.
【0004】[0004]
【数1】Si+2FeO→SiO2+2Fe[Equation 1] Si + 2FeO → SiO 2 + 2Fe
【0005】一方、生石灰(CaO)を脱硫剤として溶銑1
の脱硫処理を行なう場合は、下式数2に示される様に還
元反応によって進行する。On the other hand, quicklime (CaO) is used as a desulfurizing agent
In the case of performing the desulfurization treatment of, the reaction proceeds by a reduction reaction as shown in the following equation (2).
【0006】[0006]
【数2】FeS+CaO+C→CaS+Fe+CO[Equation 2] FeS + CaO + C → CaS + Fe + CO
【0007】上記の数1及び数2の式で示される反応
は、一方が酸化反応であり、他方が還元反応であるとい
う互いに相反する反応であり、上記予備処理剤として、
脱珪剤と脱硫剤の両方を用いて同一溶銑樋3内にインジ
ェクションしたとしても、同時にこれらの反応が進行す
るとは考えにくい。The reactions represented by the above formulas (1) and (2) are contradictory reactions, one of which is an oxidation reaction and the other of which is a reduction reaction.
Even if both the desiliconizing agent and the desulfurizing agent are used for injection into the same hot metal gutter 3, it is unlikely that these reactions proceed at the same time.
【0008】そこで溶銑樋3内に一方の予備処理剤をイ
ンジェクションして脱珪又は脱硫の一方の反応を進行さ
せておき、特開平1−165710号に示される様に受
銑後トーピードカー等で溶銑予備処理場に運び、そこで
トーピードカー内の溶銑1に対し他方の反応を進行せし
めることで該溶銑1の脱硫・脱珪の両処理を実施するこ
とが考えられる。Therefore, one of the pretreatment agents is injected into the hot metal gutter 3 to advance one reaction of desiliconization or desulfurization, and as shown in JP-A-1-165710, after the hot metal is received, the hot metal is used in a torpedo car or the like. It is possible to carry out both desulfurization and desiliconization of the hot metal 1 by transporting it to the pretreatment site and letting the hot metal 1 in the torpedo car proceed with the other reaction.
【0009】しかし、以上の方法によれば、処理時間が
長くなり、且つそのために溶銑輸送中に該溶銑1の温度
が低下すること、及びスラグオフするための要員やコス
トが増加することになる。However, according to the above method, the treatment time becomes long, and therefore the temperature of the hot metal 1 is lowered during the transportation of the hot metal, and the personnel and cost for slag-off increase.
【0010】本発明は従来技術の以上の様な問題に鑑み
創案されたもので、溶銑の脱硫及び脱珪反応を近接した
位置で夫々独立させて行なわしめ、以って両反応が短時
間のうちに別々に進行できるようにせんとするものであ
る。The present invention was devised in view of the above problems of the prior art. The desulfurization and desiliconization reactions of hot metal are independently performed at close positions, so that both reactions can be performed in a short time. The idea is to allow them to proceed separately.
【0011】[0011]
【課題を解決するための手段】そのため本発明の高炉鋳
床脱硫脱珪方法は、高炉から出銑された溶銑に脱硫剤又
は脱珪剤のどちらか一方を吹込むと共に、その後溶銑傾
注樋を経て溶銑取鍋内に落下注入される溶銑にも残りの
一方を吹込むことを基本的特徴としている。Therefore, the blast furnace cast bed desulfurization desiliconization method of the present invention is to blow either one of the desulfurizing agent or the desiliconizing agent into the hot metal tapped from the blast furnace, and then to carry out the hot metal decanting gutter. The basic feature is that the remaining one is blown into the hot metal that is dropped and poured into the hot metal ladle.
【0012】[0012]
【作用】まず出銑された溶銑に上記予備処理剤の一方を
吹込むことで溶銑傾注樋に落下した時に得られる溶銑の
攪拌力を利用して脱硫又は脱珪の一方の処理を行なわし
め、次にこの傾注樋から溶銑取鍋に落下注入した所にも
う一方の予備処理剤を吹込むことによってその落下時に
得られた溶銑の攪拌力を利用して他方の予備処理反応を
進行せしめる。従って出銑後溶銑取鍋内に注入されるま
での短い間に溶銑の脱硫及び脱珪反応が夫々独立して進
行することになる。[Operation] First, one of the above pretreatment agents is blown into tapped hot metal to perform desulfurization or desiliconization using the stirring force of the hot metal obtained when the hot metal is dropped into the hot metal inclined pouring trough. Next, the other pretreatment agent is blown into the place where it is dropped and poured into the hot metal ladle from this tilting gutter so that the stirring action of the hot metal obtained at the time of the fall is used to advance the other pretreatment reaction. Therefore, the desulfurization and desiliconization reactions of the hot metal independently proceed in a short time after the hot metal is poured into the hot metal ladle.
【0013】[0013]
【実施例】以下本発明法の具体的実施例を添付図面に基
づき説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the method of the present invention will be described below with reference to the accompanying drawings.
【0014】図1は本発明の高炉鋳床脱硫・脱珪方法の
一実施例を示す説明図である。FIG. 1 is an explanatory view showing an embodiment of the blast furnace casting bed desulfurization / desiliconization method of the present invention.
【0015】出銑口2から流出した溶銑1は溶銑樋3に導
かれて流れる。この時溶銑1中に混入している溶滓1aを
スキンマー4で除去する。その後溶銑1は溶銑樋3の中を
流れて溶銑傾注樋5に流入する。更にこの傾注樋5によっ
て溶銑1は溶銑受入れ容量250tonの溶銑取鍋6の上部に導
かれ、滝状の流下溶銑1となってこの取鍋6の中に落下注
入される。そして該取鍋6中の溶銑1は溶滓1aを分離浮上
させながら、徐々にその湯面を上昇させてくる。The hot metal 1 flowing out from the tap hole 2 is guided to the hot metal gutter 3 and flows. At this time, the slag 1a mixed in the hot metal 1 is removed by a skinmer 4. After that, the hot metal 1 flows through the hot metal gutter 3 and flows into the hot metal tilting gutter 5. Further, the tilting gutter 5 guides the hot metal 1 to the upper part of the hot metal ladle 6 having a hot metal receiving capacity of 250 tons, and becomes the waterfall-shaped downflow hot metal 1 which is dropped and poured into the ladle 6. The molten pig iron 1 in the ladle 6 gradually raises the molten metal surface while separating and floating the molten slag 1a.
【0016】本実施例では溶銑樋3の途中の上方に脱珪
ランス7を設け、ホッパ7aからミルスケール等の脱珪剤
を投射する。該脱珪剤による溶銑1の脱珪反応〔上記数
1による〕は、溶銑樋3内と溶銑傾注樋5内に落下した時
に進行する。一方、溶銑取鍋6内に脱硫ランス8を挿入
し、ホッパ8aから生石灰等の脱硫剤を取鍋6内の溶銑1浴
中深くに投入する。該脱硫剤による溶銑1の脱硫反応
〔上記数2による〕は、取鍋6内の溶銑1浴中深くに入
り、そこから浮上してくる過程で溶銑1の攪拌を受けて
進行することになる。即ち、溶銑傾注樋5及び溶銑取鍋6
は夫々脱珪、脱硫の独立した反応槽として使用されるこ
とになり、脱珪反応及び脱硫反応が夫々独立しながらも
連続して行なわれる。In this embodiment, a silicidation lance 7 is provided in the upper part of the hot metal gutter 3, and a silicidation agent such as mill scale is projected from the hopper 7a. The desiliconization reaction of the hot metal 1 by the desiliconizing agent [according to the above mathematical expression 1] proceeds when it falls into the hot metal gutter 3 and the hot metal inclined pouring gutter 5. On the other hand, the desulfurization lance 8 is inserted into the hot metal ladle 6 and the desulfurizing agent such as quick lime is put into the hot metal 1 bath deep inside the ladle 6 from the hopper 8a. The desulfurization reaction of the hot metal 1 by the desulfurizing agent [according to the above formula 2] goes deep into the hot metal 1 bath in the ladle 6 and progresses with stirring of the hot metal 1 in the process of rising from there. . That is, hot metal tilting gutter 5 and hot metal ladle 6
Will be used as independent reaction tanks for desiliconization and desulfurization, respectively, and the desiliconization reaction and the desulfurization reaction will be carried out independently and continuously.
【0017】溶銑取鍋6の中に溶銑1が注入される所要時
間は約30分であり、該取鍋6中の受注溶銑1が満杯の25
0tonに達すると共に、溶銑1の受入れとこれらの脱珪剤
・脱硫剤の投射を停止する。ここで溶銑1が注入開始さ
れてから数分後に脱珪剤及び脱硫剤の投射が始まり、約
20分で終わった。The time required for pouring the hot metal 1 into the hot metal ladle 6 is about 30 minutes, and the hot metal 1 ordered in the ladle 6 is full of 25
As soon as it reaches 0 tons, acceptance of hot metal 1 and projection of these desiliconizing agents and desulfurizing agents are stopped. A few minutes after the injection of the hot metal 1 started, the projection of the desiliconizing agent and the desulfurizing agent started and ended in about 20 minutes.
【0018】以上の本実施例の実施結果を下記表1及び
表2に示す。この表1は本実施例による処理が行なわれ
る前と行なわれた後の溶銑1中の成分組成を、又表2は
使用した脱珪剤及び脱硫剤の成分組成と使用原単位とを
示している。The results of the implementation of the above-described embodiment are shown in Tables 1 and 2 below. Table 1 shows the composition of the components in the hot metal 1 before and after the treatment according to this example, and Table 2 shows the composition of the desiliconizing agent and desulfurizing agent used and the basic unit used. There is.
【0019】[0019]
【表1】 単位
(%) [Table 1] Unit
(%)
【0020】[0020]
【表2】 [Table 2]
【0021】これらの表から脱珪剤及び脱硫剤の使用原
単位があまり大きくならなくとも、十分溶銑1の脱珪及
び脱硫が進んでいることがわかる。From these tables, it can be seen that desiliconization and desulfurization of the hot metal 1 are sufficiently advanced even if the basic unit used of the desiliconizing agent and the desulfurizing agent does not become too large.
【0022】一方、出銑からこれらの処理を経て転炉に
到る時間を計測したところ、図2に示される様に、本実
施例では、脱珪及び脱硫反応が効率よく進行し、転炉に
到るまでの時間が約2時間であった。ところが受銑にお
ける脱珪とトーピードカー搬送後溶銑予備処理場におけ
る脱硫とを行なった後転炉に搬送する従来法ではその所
要時間に約6時間を要した。この様な処理時間の短縮に
伴ない、輸送中に低下する温度は約70℃程度となり、
その熱低下抑制分だけ転炉内での熱余裕を生じ、鉄鉱石
の直接投入量が促進され、大幅なコスト低減が図れるこ
とになる。On the other hand, when the time required for reaching the converter through these treatments from tapping iron was measured, as shown in FIG. 2, in the present embodiment, the desiliconization and desulfurization reaction proceeded efficiently, and the converter It took about 2 hours to reach. However, it takes about 6 hours in the conventional method of carrying out desiliconization in the pig iron and desulfurization in the hot metal pretreatment site after carrying the torpedo car and then carrying it to the converter. With such shortening of processing time, the temperature dropped during transportation is about 70 ° C,
A heat margin in the converter is generated by the amount of heat reduction suppression, the amount of iron ore directly input is promoted, and a significant cost reduction can be achieved.
【0023】[0023]
【発明の効果】以上詳述した本発明によれば、溶銑の脱
硫及び脱珪反応を近接した位置で夫々独立させて行なわ
しめることができるようになり、従って両反応が短時間
のうちに別々に進行できるようになる。その結果、溶銑
輸送中の該溶銑の温度低下が抑制され、又スラグオフす
るための要員やコストが低くて済むことになる。According to the present invention described in detail above, the desulfurization and desiliconization reactions of hot metal can be independently carried out at the positions close to each other. Therefore, both reactions can be performed separately in a short time. You will be able to proceed. As a result, the temperature drop of the hot metal during transportation of the hot metal is suppressed, and the personnel and cost for slag-off can be reduced.
【図1】本発明の一実施例に係る溶銑の脱硫・脱珪方法
を示した説明図である。FIG. 1 is an explanatory diagram showing a method of desulfurizing and desiliconizing hot metal according to an embodiment of the present invention.
【図2】本実施例及び従来例を夫々実施した場合の出銑
から転炉までの輸送に要する時間を示したグラフであ
る。FIG. 2 is a graph showing the time required for transportation from the tapped iron to the converter when each of the present embodiment and the conventional example is carried out.
【図3】従来の溶銑予備処理方法の一例を示す説明図で
ある。FIG. 3 is an explanatory diagram showing an example of a conventional hot metal pretreatment method.
1 溶銑 2 出銑口 3 溶銑樋 5 溶銑傾注樋 6 溶銑取鍋 7 脱珪ランス 8 脱硫ランス 1 Hot metal 2 Outlet tap 3 Hot metal gutter 5 Hot metal tilting gutter 6 Hot metal ladle 7 Desiliconization lance 8 Desulfurization lance
Claims (1)
珪剤のうちどちらか一方を吹込むと共に、その後溶銑傾
注樋を経て溶銑取鍋内に落下注入される溶銑にも残りの
一方を吹込むことを特徴とする高炉鋳床脱硫脱珪方法。1. The hot metal tapped from the blast furnace is blown with one of a desulfurizing agent and a desiliconizing agent, and then the remaining hot metal is dropped into a hot metal ladle through the hot metal tilting gutter. A method for desulfurizing and desiliconizing a blast-furnace cast bed, which comprises blowing
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP26854691A JPH0578724A (en) | 1991-09-20 | 1991-09-20 | Desulfurizing and desiliconizing methods on casting floor in blast furnace |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP26854691A JPH0578724A (en) | 1991-09-20 | 1991-09-20 | Desulfurizing and desiliconizing methods on casting floor in blast furnace |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0578724A true JPH0578724A (en) | 1993-03-30 |
Family
ID=17460035
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP26854691A Pending JPH0578724A (en) | 1991-09-20 | 1991-09-20 | Desulfurizing and desiliconizing methods on casting floor in blast furnace |
Country Status (1)
Country | Link |
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JP (1) | JPH0578724A (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS51105914A (en) * | 1975-03-14 | 1976-09-20 | Sumitomo Metal Ind | |
JPS60184613A (en) * | 1984-03-02 | 1985-09-20 | Sumitomo Metal Ind Ltd | Pretreatment of molten iron |
-
1991
- 1991-09-20 JP JP26854691A patent/JPH0578724A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS51105914A (en) * | 1975-03-14 | 1976-09-20 | Sumitomo Metal Ind | |
JPS60184613A (en) * | 1984-03-02 | 1985-09-20 | Sumitomo Metal Ind Ltd | Pretreatment of molten iron |
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