JPH0474410B2 - - Google Patents
Info
- Publication number
- JPH0474410B2 JPH0474410B2 JP59040844A JP4084484A JPH0474410B2 JP H0474410 B2 JPH0474410 B2 JP H0474410B2 JP 59040844 A JP59040844 A JP 59040844A JP 4084484 A JP4084484 A JP 4084484A JP H0474410 B2 JPH0474410 B2 JP H0474410B2
- Authority
- JP
- Japan
- Prior art keywords
- hot metal
- dephosphorization
- slag
- desiliconization
- skinmer
- 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 - Lifetime
Links
- 239000002184 metal Substances 0.000 claims description 38
- 229910052751 metal Inorganic materials 0.000 claims description 38
- 238000000034 method Methods 0.000 claims description 28
- 239000003795 chemical substances by application Substances 0.000 claims description 25
- 238000006477 desulfuration reaction Methods 0.000 claims description 24
- 230000023556 desulfurization Effects 0.000 claims description 24
- 239000002893 slag Substances 0.000 claims description 23
- 238000011282 treatment Methods 0.000 claims description 19
- 238000002203 pretreatment Methods 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 5
- 230000003009 desulfurizing effect Effects 0.000 claims description 2
- 229910000805 Pig iron Inorganic materials 0.000 description 8
- 238000010079 rubber tapping Methods 0.000 description 7
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 238000011144 upstream manufacturing Methods 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 235000017550 sodium carbonate Nutrition 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910014813 CaC2 Inorganic materials 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 235000010216 calcium carbonate Nutrition 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000005475 siliconizing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
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
- C21C1/00—Refining of pig-iron; Cast iron
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Description
発明の技術分野
この発明は高炉から出銑した溶銑の脱珪、脱
燐、脱硫処理を出銑過程において効果的に行なう
溶銑の予備処理方法に関する。
従来技術とその問題点
高炉から出銑された溶銑の成分組成は次の製鋼
工程における精錬能率や鋼の品質に大きく影響す
るので、製鋼工程を合理化し、操業を容易にする
ため、溶銑の成分組成や生産鋼種に応じて種々の
溶銑予備処理法が適宜に採用されている。
溶銑の予備処理としては、脱硫、脱燐、脱珪等
があり、その方法としては高炉鋳床、溶銑取鍋、
トーピードカー等で行なわれている。この溶銑予
備処理において、脱珪処理は脱硫、脱燐処理の前
に行なわれるが、最近ではこの脱珪処理を出銑過
程で行なう樋脱珪法がよく利用されている。例え
ば、特公昭58−56723号で知られるごとく、出銑
樋内の溶銑に対し脱珪剤を添加し、一緒に流れて
いく間の自然な混合を利用して脱珪する方法が知
られている。しかしながら、従来の樋脱珪法はス
キンマーの下流において脱珪剤を添加しているの
で、脱珪処理後にトーピードや取鍋で脱珪スラグ
を除去する必要がある。また、引き続いてトーピ
ードや取鍋で行なわれる脱燐、脱硫処理は、脱
燐・脱硫反応を促進するためにN2ガス等と共に
脱燐、脱硫剤をインジエクシヨン方式で吹込み、
処理後脱燐、脱硫スラグを除去するのが通例であ
つた。
溶銑の予備処理は本来転炉で行なつてきた脱
珪、脱燐、脱硫処理を溶銑段階で行なうのである
から、プロセスの複雑化は避けられないが、その
中において如何に単純にかつ効率的にこれらの処
理を行なうかということが技術的に解決されなけ
ればならない。しかしながら、従来一般的に行な
われている溶銑の予備処理法では前記した通り、
処理後にスラグ（特に脱珪スラグ）の除去を必要
とし、また溶銑と処理剤の撹拌のためにN2ガス
等を必要とするため、工程、処理時間の増加を余
儀なくされ、大量の溶銑予備処理には不向きであ
つた。
発明の目的
この発明は従来の前記実情に鑑みてなされたも
ので、大量の溶銑の予備処理に対応すべく、出銑
過程で溶銑の脱珪、脱硫、脱燐処理を効果的に行
なう溶銑の予備処理方法を提案することを目的と
するものである。
発明の開示
この発明に係る溶銑の予備処理方法は、高炉出
銑樋上で溶銑の予備処理を行なう方法において、
出銑口からスキンマーに至る間で脱珪剤を添加し
て脱珪処理を行ない、脱珪スラグをスキンマーに
て高炉スラグと共に溶銑より分離し、続いてスキ
ンマーからトーピードに至る間で脱燐、脱硫剤を
添加し、トーピードへの落下流を利用して攪拌
し、脱燐、脱硫処理を行なうことを特徴とするも
のである。
すなわちこの発明は、溶銑の脱珪をスキンマー
上流で行ない脱珪スラグをスキンマーにて高炉ス
ラグと共に溶銑より分離させ、さらに脱珪スラグ
を分離した脱珪銑に対し、スキンマー下流の溶銑
樋上で脱燐、脱硫剤を添加し、トーピードへの落
下流を利用して撹拌することで脱燐、脱硫処理を
効果的に行なう方法である。
以下、この発明法を図面を参照しつつ詳細に説
明する。
第１図において、１は高炉、２は出銑口、３は
出銑樋、４はスキンマー、５は排滓口、６はトー
ピードカーをそれぞれ示す。すなわち、高炉１の
出銑口２より排出する溶銑７は、出銑樋内に設置
されているスキンマー４にてスラグ８が分離さ
れ、分離されたスラグは排滓口５より排出し、溶
銑７はスキンマー４を通過してトービードカー６
に至るが、この出銑過程において、出銑口２より
スキンマー４に至るまでの出銑樋３を流れる溶銑
７に対して脱珪剤９を添加する。脱珪剤９を添加
する場所は特に限定するものではないが、通常ス
キンマー４までは溶銑７上をスラブ８が覆つてお
り自然混合では脱珪効率が低下する可能性がある
ため、実際には出銑口２に近い所が望ましい。特
に出銑口２から流下する溶銑の落下点付近に脱珪
剤９を添加すればより効果的である。その他脱珪
を促進させる方法としては、例えば出銑口カバー
を利用してN2ガスまたは空気等と共に固形脱珪
剤をインジエクシヨンする方法、あるいは出銑樋
に落差をつけその落差によつて生ずる撹拌流に脱
珪剤を捲込ませる方法等を採用することもでき
る。また、この脱珪剤の添加量としては、〔Ｓ〕
含有量に応じて定めることになるが、この段階で
は前記した通り溶銑がスラグに覆われているの
で、脱珪剤がスラグに捕捉されやすい。従つて、
多量に添加してもそれがすべて反応するとは限ら
ないので、溶銑量、〔Si〕含有量に応じ適当に加
減して添加する。
このようにして脱珪された溶銑は、スキンマー
４にて高炉スラグと脱珪スラグが分離されてスキ
ンマー下流へ流れる。ここで、トーピードカー６
に落下する前の脱珪銑７−２に対して脱燐および
脱硫剤１０を添加する。脱燐および脱硫剤の添加
方法としては、溶銑流への単なる投入法を採用す
ることができる。トーピードカー６へ落下する前
で添加した脱燐および脱硫剤は、脱珪銑と共にト
ーピードカー６へ落下するので、脱珪銑の落下エ
ネルギーによつて生ずる撹拌流に巻き込まれ効率
よく脱燐、脱硫処理が行なわれる。なお、この発
明法における脱珪剤としては、製鉄ダスト、ミル
スケール、粉鉱石、焼結鉱粉等の酸化鉄系、およ
びMnO系、あるいはO2含有ガス等を用いること
ができる。また、脱燐、脱硫剤としては、
Na2CO3、CaC2、CaO、CaCO3、CaF等を用いる
ことができる。
次に、この発明の実施例について説明する。
実施例
高炉から出銑される第１表に示す成分を有する
溶銑（温度1510℃）に対し、スキンマー上流の出
銑樋上で脱珪剤（平均粒度５mmの焼結粉）をイン
ジエクシヨン方式（エアー圧２Kg／cm3）で25Kg／
Ｔ吹込んで脱珪し、続いて脱珪銑に対しスキンマ
ー下流で脱燐、脱硫剤（ソーダ灰）を25Kg／Ｔ投
入した。
本実施例における脱珪処理後の溶銑成分と脱
燐、脱硫後の溶銑成分を第２表に示す。
第２表から明らかなごとく、通常の出銑から受
銑の間に脱珪、脱燐および脱硫を効率よく行なう
ことができた。
TECHNICAL FIELD OF THE INVENTION The present invention relates to a hot metal pretreatment method for effectively performing desiliconization, dephosphorization, and desulfurization treatments on hot metal tapped from a blast furnace during the tapping process. Prior art and its problems The composition of hot metal tapped from a blast furnace greatly affects the refining efficiency and quality of steel in the next steelmaking process. Various hot metal pretreatment methods are appropriately adopted depending on the composition and the type of steel produced. Pretreatment of hot metal includes desulfurization, dephosphorization, desiliconization, etc., and the methods include blast furnace casthouse, hot metal ladle,
It is carried out using torpedo cars, etc. In this hot metal pretreatment, desiliconization treatment is performed before desulfurization and dephosphorization treatment, but recently, a trough desiliconization method in which this desiliconization treatment is performed during the tapping process has been frequently used. For example, as known from Japanese Patent Publication No. 58-56723, there is a method of adding a desiliconizing agent to the hot metal in the tap culvert and utilizing the natural mixing as it flows together to desiliconize the hot metal. There is. However, in the conventional gutter desiliconization method, a desiliconization agent is added downstream of the skinmer, so it is necessary to remove the desiliconization slag with a torpedo or ladle after the desiliconization process. In addition, in the subsequent dephosphorization and desulfurization treatment performed in a torpedo or ladle, a dephosphorization and desulfurization agent is blown in with N2 gas etc. using an injection method to promote the dephosphorization and desulfurization reactions.
It was customary to remove phosphorization and desulfurization slag after treatment. Pre-treatment of hot metal involves performing desiliconization, dephosphorization, and desulfurization treatments, which were originally performed in a converter, at the hot metal stage, so the complexity of the process is unavoidable. The question of whether these processes should be carried out must be solved technically. However, as mentioned above, in the conventional pretreatment method of hot metal,
After treatment, it is necessary to remove slag (especially desiliconization slag), and N2 gas is required to stir the hot metal and treatment agent, which increases the process and treatment time, and requires a large amount of hot metal pretreatment. It was unsuitable for me. Purpose of the Invention The present invention was made in view of the above-mentioned conventional situation, and in order to cope with the preliminary treatment of a large amount of hot metal, it has been made to provide a hot metal that effectively performs desiliconization, desulfurization, and dephosphorization treatment of hot metal during the tapping process. The purpose of this paper is to propose a pretreatment method. DISCLOSURE OF THE INVENTION A method for pre-treating hot metal according to the present invention is a method for pre-treating hot metal on a blast furnace tap trough.
A desiliconizing agent is added between the tap hole and the skinmer to perform desiliconization treatment, and the desiliconized slag is separated from the hot metal along with blast furnace slag in the skinmer, followed by dephosphorization and desulfurization between the skinmer and the torpedo. This method is characterized in that a dephosphorization and desulfurization treatment is performed by adding a chemical agent and stirring using the falling flow into a torpedo. That is, this invention performs desiliconization of hot metal upstream of the skinmer, separates the desiliconized slag from the hot metal together with blast furnace slag in the skimmer, and then dephosphorizes the desiliconized pig iron from which the desiliconized slag has been separated on the hot metal gutter downstream of the skinmer. This method effectively performs dephosphorization and desulfurization treatment by adding a desulfurizing agent and stirring using the falling flow to the torpedo. Hereinafter, this invention method will be explained in detail with reference to the drawings. In FIG. 1, 1 is a blast furnace, 2 is a tap hole, 3 is a tap sluice, 4 is a skimmer, 5 is a slag discharge port, and 6 is a torpedo car. That is, molten pig iron 7 discharged from the tap hole 2 of the blast furnace 1 is separated into slag 8 by the skinmer 4 installed in the tap trough, and the separated slag is discharged from the slag discharge port 5, and the molten pig iron 7 is passed through Skimmer 4 and reached Torbeid Car 6.
However, in this tapping process, a desiliconizing agent 9 is added to the hot metal 7 flowing through the tap sluice 3 from the tap hole 2 to the skinmer 4. The place where the desiliconizing agent 9 is added is not particularly limited, but usually the slab 8 covers the hot metal 7 up to the skimmer 4, and natural mixing may reduce the desiliconizing efficiency, so in reality, A location close to taphole 2 is desirable. In particular, it is more effective if the desiliconizing agent 9 is added near the point where the hot metal flowing down from the taphole 2 falls. Other methods for promoting desiliconization include, for example, using a taphole cover to inject a solid desiliconizing agent together with N 2 gas or air, or creating a head in the tap culvert and agitation caused by the head. It is also possible to adopt a method in which a desiliconizing agent is rolled into the flow. In addition, the amount of this desiliconizing agent added is [S]
Although it is determined depending on the content, at this stage, as described above, the hot metal is covered with slag, so the desiliconizing agent is likely to be captured by the slag. Therefore,
Even if a large amount is added, not all of it will react, so add it in an appropriate amount depending on the amount of hot metal and [Si] content. The thus desiliconized hot metal is separated into blast furnace slag and desiliconized slag by the skinmer 4, and flows downstream of the skinmer. Here, Torpedo Car 6
A dephosphorization and desulfurization agent 10 is added to the desiliconized pig iron 7-2 before it is dropped. As a method for adding the dephosphorization and desulfurization agent, a method of simply adding it to the hot metal flow can be adopted. The dephosphorization and desulfurization agent added before falling into the torpedo car 6 falls into the torpedo car 6 together with the desiliconization pig iron, so it is caught up in the stirring flow generated by the falling energy of the desiliconization pig iron, and the dephosphorization and desulfurization processes are carried out efficiently. It is done. In addition, as the desiliconizing agent in this invention method, iron oxide type such as iron dust, mill scale, powdered ore, sintered ore powder, MnO type, or O2 - containing gas can be used. In addition, as a dephosphorization and desulfurization agent,
Na2CO3 , CaC2 , CaO, CaCO3 , CaF , etc. can be used. Next, embodiments of the invention will be described. Example A desiliconizing agent (sintered powder with an average particle size of 5 mm) was applied to hot metal having the components shown in Table 1 (temperature: 1510°C), which is tapped from a blast furnace, on the tap flute upstream of the skinmer using an in-die extraction method (air pressure 2Kg/ cm3 ) and 25Kg/
Desiliconization was carried out by injecting T, and then 25 kg/T of dephosphorization and desulfurization agent (soda ash) was added to the desiliconized pig iron downstream of the skimmer. Table 2 shows the hot metal components after desiliconization and the hot metal components after dephosphorization and desulfurization in this example. As is clear from Table 2, desiliconization, dephosphorization, and desulfurization could be carried out efficiently during the period from normal tapping to iron receiving.
【表】【table】
【表】
上記の実施例からも明らかなごとく、この発明
法によれば、脱珪処理をスキンマー上流で行ない
脱珪スラグの分離をスキンマーにて行なうこと
で、新たなスラグ処理を必要とせず、またスキン
マーからトーピードカーへ受銑する間に脱燐およ
び脱硫剤を添加することで、N2ガス等を必要と
せずに脱燐、脱硫処理を行なうことができるの
で、溶銑予備処理を工程増、処理時間増なく行な
うことができ、大量の溶銑予備処理が可能であ
る。[Table] As is clear from the above examples, according to the method of the present invention, the desiliconization treatment is performed upstream of the skinmer and the separation of the desiliconization slag is performed in the skinmer, thereby eliminating the need for additional slag treatment. In addition, by adding a dephosphorization and desulfurization agent during the transfer from the skimmer to the torpedo car, dephosphorization and desulfurization can be performed without the need for N2 gas, etc. This process can be carried out without any increase in time, and a large amount of hot metal can be pretreated.
第１図はこの発明の一実施例を示す概略図であ
る。
１……高炉、２……出銑口、３……出銑樋、４
……スキンマー、５……排滓口、６……トーピー
ドカー、７……溶銑、７−２……脱珪銑、８……
スラグ、９……脱珪剤、１０……脱燐、脱硫剤。
FIG. 1 is a schematic diagram showing an embodiment of the present invention. 1...Blast furnace, 2...Tapping hole, 3...Tapping sluice, 4
...Skinmer, 5...Slag port, 6...Torpedo car, 7...Hot metal, 7-2...Siliconizing pig iron, 8...
Slag, 9... desiliconization agent, 10... dephosphorization, desulfurization agent.
Claims (1)
おいて、出銑口からスキンマーに至る間で脱珪剤
を添加して脱珪処理を行ない、脱珪スラグをスキ
ンマーにて高炉スラグと共に溶銑より分離し、続
いてスキンマーからトーピードに至る間で脱燐、
脱硫剤を添加し、トーピードへの落下流を利用し
て撹拌し、脱燐、脱硫処理を行なうことを特徴と
する溶銑の予備処理方法。1 In a method of preliminary treatment of hot metal on the blast furnace tap runner, a desiliconizing agent is added between the tap hole and the skinmer to perform the desiliconization process, and the desiliconized slag is separated from the hot metal along with the blast furnace slag at the skinmer. followed by dephosphorization from skinmer to torpedo,
A hot metal pretreatment method characterized by adding a desulfurizing agent and stirring using a falling flow into a torpedo to perform dephosphorization and desulfurization treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4084484A JPS60184613A (en) | 1984-03-02 | 1984-03-02 | Pretreatment of molten iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4084484A JPS60184613A (en) | 1984-03-02 | 1984-03-02 | Pretreatment of molten iron |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60184613A JPS60184613A (en) | 1985-09-20 |
| JPH0474410B2 true JPH0474410B2 (en) | 1992-11-26 |
Family
ID=12591899
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4084484A Granted JPS60184613A (en) | 1984-03-02 | 1984-03-02 | Pretreatment of molten iron |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60184613A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020022577A1 (en) * | 2018-07-24 | 2020-01-30 | 주식회사 포스코 | Apparatus for molten iron runner desilication |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| LU86689A1 (en) * | 1985-12-03 | 1987-05-04 | Centro Speriment Metallurg | CONTINUOUS PURIFICATION PROCESS OF MOLTEN CAST IRON |
| IT1234939B (en) * | 1985-12-06 | 1992-06-02 | Centro Speriment Metallurg | PROCEDURE FOR THE REDUCTION OF THE CONTENT OF IMPURITIES IN CAST IRON |
| JPS63238209A (en) * | 1987-03-27 | 1988-10-04 | Nippon Steel Corp | Method for pretreating molten iron |
| JPH0517809A (en) * | 1991-05-07 | 1993-01-26 | Nkk Corp | Hearth desulfurization method for blast furnace |
| JPH0578725A (en) * | 1991-09-20 | 1993-03-30 | Nkk Corp | Method for automatically controlling desulfurizing treatment on casting floor in blast furnace and device therefor |
| JPH0578724A (en) * | 1991-09-20 | 1993-03-30 | Nkk Corp | Desulfurizing and desiliconizing methods on casting floor in blast furnace |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54102217A (en) * | 1978-01-31 | 1979-08-11 | Nisshin Steel Co Ltd | Continuous molten iron treating method and apparatus |
| JPS60162713A (en) * | 1984-02-04 | 1985-08-24 | Nippon Kokan Kk <Nkk> | Device for treating molten iron |
| JPS60162710A (en) * | 1984-02-04 | 1985-08-24 | Nippon Kokan Kk <Nkk> | Device for treating molten iron |
-
1984
- 1984-03-02 JP JP4084484A patent/JPS60184613A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54102217A (en) * | 1978-01-31 | 1979-08-11 | Nisshin Steel Co Ltd | Continuous molten iron treating method and apparatus |
| JPS60162713A (en) * | 1984-02-04 | 1985-08-24 | Nippon Kokan Kk <Nkk> | Device for treating molten iron |
| JPS60162710A (en) * | 1984-02-04 | 1985-08-24 | Nippon Kokan Kk <Nkk> | Device for treating molten iron |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020022577A1 (en) * | 2018-07-24 | 2020-01-30 | 주식회사 포스코 | Apparatus for molten iron runner desilication |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60184613A (en) | 1985-09-20 |
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