JPS6145681B2 - - Google Patents
Info
- Publication number
- JPS6145681B2 JPS6145681B2 JP57011486A JP1148682A JPS6145681B2 JP S6145681 B2 JPS6145681 B2 JP S6145681B2 JP 57011486 A JP57011486 A JP 57011486A JP 1148682 A JP1148682 A JP 1148682A JP S6145681 B2 JPS6145681 B2 JP S6145681B2
- Authority
- JP
- Japan
- Prior art keywords
- hot metal
- refining agent
- lance
- flow
- metal flow
- 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
Links
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
- C21C1/02—Dephosphorising or desulfurising
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
この発明は、溶銑予備処理法に関するものであ
る。
従来、取鍋精錬のかわりに、第１図に示される
ように高炉出銑樋１を流れる溶銑流２上に粉状の
精錬剤３を上置きすることによつて精錬剤３を溶
銑流２中に添加して脱Si，脱Ｐ等の予備処理を行
なう方法が、精錬能率向上を目的として提案され
ている。
しかし、上記方法は、添加された精錬剤と溶銑
との接触性が悪く反応速度が遅いために、精錬に
長時間を要するとともに、取鍋に受銑した後も反
応が進行するので、スラグフオーミング等が生じ
安全性、作業性、歩留り等の面で問題があつた。
そこで、上記所謂精錬剤の上置き法の有する問
題を解決する方法として、本以明者は、当初、第
２図に示されるように、出銑樋１を流れる溶銑流
２中にランス４の先端部を挿入し、タンク５内の
粉状の精錬剤３を搬送用の不活性ガスとともに溶
銑中に吹込んで添加する、インジエクシヨン法を
考案し、研究した。
上記インジエクシヨン法によれば、粉状の精錬
剤３が溶銑流２中に深く浸入し、精錬剤３と溶銑
とが撹拌されるので、反応が速く短時間に精錬で
き、従つて、受銑後のスラグフオーミング等の虞
れがないといつた利点があることがわかつた。
しかし、ランス４を溶銑流２中に浸漬するの
で、ランス４の溶損が激しく、長時間の使用に耐
えられない。また、ランス４の先端から放出され
る精錬剤３によつて出銑樋１の底部が浸食される
等の問題があつた。従つて、このままでは、ラン
ス４や出銑樋１の補修、取替えといつた設備費用
が増大してしまい、インジエクシヨン法が溶銑中
の不純物を短時間で低濃度にできる優れた利点を
有するにもかかわらず、インジエクシヨン法によ
つて溶銑の予備処理をすることは、実操業上不可
能であつた。
この発明は、上記インジエクシヨン法の有する
問題点を解決して、溶銑の不純物除去効率に優
れ、かつ、実操業に適した溶銑の予備処理法を提
供するものであつて、高炉の羽口より落下して出
銑樋を流れる溶銑流中に粉状の精錬剤を添加し
て、前記溶銑の予備処理を行なう方法において、
前記出銑樋を流れる前記溶銑流の湯面から離して
垂直に設置したランスから、前記精錬剤を搬送用
ガスによつて前記溶銑流中に吹込むことにより、
前記溶銑が前記高炉の羽口より前記出銑樋に落下
するときの撹拌作用を利用することなく、前記精
錬剤を前記溶銑流中に添加することに特徴を有す
る。
この発明の方法を図面を参照しながら説明す
る。
第３図は、この発明の方法の説明図である。
第３図に示されるように、この発明の方法は溶
銑流２の湯面から離して垂直に設けられたランス
４の先端からタンク５内の精錬剤３を溶銑中に所
定の流速で吹込んで、精錬剤３を溶銑流２中に添
加するものである。精錬剤３には粉状の精錬剤を
用いる。精錬剤３の吹込みに際しては、精錬剤３
単体あるいは搬送用の不活性ガスとともに行な
う。精錬剤３の吹込み流速は、溶銑が高炉羽口か
ら出銑樋に落下するときの撹拌作用を利用するこ
となく、溶銑中に精錬剤３を充分に入り込ませる
ように溶銑流２の速度および流量に応じて増減さ
せるが、余り流速が大きすぎると溶銑が飛散しロ
スが大きくなるとともに危険である。一方、流速
が小さすぎると精錬剤３が溶銑中に入り込まず反
応が十分に進行しない。
ランス４の先端は直接溶銑流２と接触しないの
で、従来のインジエクシヨン法の場合のようにラ
ンス４が溶損を受ける虞れがなく、また、ランス
４の先端と出銑樋１の底部との距離が離れている
ので、前記底部が溶損される虞れもない。
精錬剤３の搬送用ガスとしては、例えば溶銑を
脱Si処理する場合には、N2，Ar，CO2，空気，
水蒸気，O2またはこれらの混合ガスを使用す
る。
次に、この発明の実施例について説明する。
流量8Ton／min、温度1450℃の溶銑流に、精
錬剤としてミルスケールを、この発明の方法に従
つてN2ガスとともに吹込み、脱Si処理を行なつ
た。この結果を前述した従来法（上置き法、イン
ジエクシヨン法）によつて処理した場合と比較し
て第１表に示す。
The present invention relates to a hot metal pretreatment method. Conventionally, instead of ladle refining, as shown in FIG. A method has been proposed for the purpose of improving refining efficiency, in which the metal is added to the metal to perform preliminary treatments such as de-Si and de-P. However, in the above method, the contact between the added refining agent and the hot metal is poor and the reaction rate is slow, so it takes a long time for refining, and the reaction continues even after the pig iron is placed in the ladle. This caused problems in terms of safety, workability, yield, etc. Therefore, as a method to solve the problem of the above-mentioned so-called overlaying method of refining agent, the inventors of the present invention initially proposed that a lance 4 be placed in the hot metal flow 2 flowing through the tap hole 1, as shown in FIG. We devised and researched an injection method in which the tip is inserted and the powdered refining agent 3 in the tank 5 is blown into the hot metal along with an inert gas for conveyance. According to the above-mentioned injection extraction method, the powdered refining agent 3 is deeply infiltrated into the hot metal flow 2 and the refining agent 3 and the hot metal are stirred, so the reaction is fast and refining can be performed in a short time. It was found that this method has the advantage that there is no risk of slag forming. However, since the lance 4 is immersed in the hot metal flow 2, the lance 4 suffers severe erosion and cannot withstand long-term use. Further, there was a problem that the bottom of the tap trough 1 was eroded by the refining agent 3 discharged from the tip of the lance 4. Therefore, if things continue as they are, equipment costs such as repairing and replacing lances 4 and tap runners 1 will increase, and even though the injection extraction method has the excellent advantage of reducing impurities in hot metal to a low concentration in a short time, However, it has been impossible in actual operation to pre-treat hot metal by the injection process. This invention solves the problems of the above-mentioned in-die extraction method and provides a pretreatment method for hot metal that is excellent in the efficiency of removing impurities from hot metal and is suitable for actual operation. In the method of pre-treating the hot metal by adding a powdered refining agent to the hot metal flow flowing through the tap hole,
By blowing the refining agent into the hot metal flow using a conveying gas from a lance installed vertically away from the surface of the hot metal flow flowing through the tap trough,
The present invention is characterized in that the refining agent is added to the hot metal flow without using the stirring action when the hot metal falls from the tuyere of the blast furnace into the tap trough. The method of this invention will be explained with reference to the drawings. FIG. 3 is an explanatory diagram of the method of the present invention. As shown in FIG. 3, the method of the present invention involves blowing a refining agent 3 in a tank 5 into the hot metal at a predetermined flow rate from the tip of a lance 4 installed vertically away from the surface of the hot metal flow 2. , a refining agent 3 is added to the hot metal stream 2. As the refining agent 3, a powdered refining agent is used. When injecting refining agent 3,
It can be carried out alone or together with an inert gas for transportation. The blowing flow rate of the refining agent 3 is adjusted to the speed of the hot metal flow 2 so that the refining agent 3 is sufficiently penetrated into the hot metal without using the stirring action when the hot metal falls from the blast furnace tuyere to the tap flute. It is increased or decreased depending on the flow rate, but if the flow rate is too high, the hot metal will scatter, increasing loss and being dangerous. On the other hand, if the flow rate is too low, the refining agent 3 will not enter the hot metal and the reaction will not proceed sufficiently. Since the tip of the lance 4 does not come into direct contact with the hot metal flow 2, there is no risk of the lance 4 being damaged by melting as in the case of the conventional injection extraction method. Since the distance is far, there is no risk of the bottom portion being melted and damaged. As the gas for conveying the refining agent 3, for example, in the case of desiliconizing hot metal, N 2 , Ar, CO 2 , air,
Use steam, O 2 or a mixture of these gases. Next, embodiments of the invention will be described. According to the method of the present invention, mill scale was blown as a refining agent into a hot metal flow at a flow rate of 8 tons/min and a temperature of 1450°C together with N 2 gas to perform a Si removal treatment. The results are shown in Table 1 in comparison with those processed by the above-mentioned conventional methods (overlay method, injection method).
【表】
第１表から明らかなように、この発明の方法に
よれば、脱Si効率が大巾に向上し、しかもインジ
エクシヨン法に比べてランスの寿命が大巾に延び
ることが明らかである。
以上説明したように、この発明によれば、溶銑
中の不純物を効率良く除去でき、かつ、精錬剤吹
込用ランスが直接溶銑に接触しないので、ランス
の溶損が激減し、その使用寿命が大巾に向上する
といつた操業上極めて有用な効果がもたらされ
る。[Table] As is clear from Table 1, it is clear that according to the method of the present invention, the Si removal efficiency is greatly improved, and the life of the lance is also greatly extended compared to the injection method. As explained above, according to the present invention, impurities in hot metal can be efficiently removed, and since the refining agent injection lance does not come into direct contact with the hot metal, the lance melting damage is drastically reduced and its service life is extended. This brings about extremely useful effects in terms of operation, such as greatly improved performance.
第１図および第２図は、従来の溶銑予備処理法
の説明図、第３図は、この発明の実施例の説明図
である。図面において、
１……出銑樋、２……溶銑流、３……精錬剤、
４……ランス、５……タンク。
1 and 2 are explanatory diagrams of a conventional hot metal pretreatment method, and FIG. 3 is an explanatory diagram of an embodiment of the present invention. In the drawings, 1... Tapping channel, 2... Hot metal flow, 3... Refining agent,
4... Lance, 5... Tank.
Claims (1)
流中に粉状の精錬剤を添加して、前記溶銑の予備
処理を行なう方法において、前記出銑樋を流れる
前記溶銑流の湯面から離して垂直に設置したラン
スから、前記精錬剤を搬送用ガスによつて前記溶
銑流中に吹込むことにより、前記溶銑が前記高炉
の羽口より前記出銑樋に落下するときの撹拌作用
を利用することなく、前記精錬剤を前記溶銑流中
に添加することを特徴とする溶銑予備処理法。1. In a method of pre-treating the hot metal by adding a powdered refining agent to the hot metal flow that falls from the tuyere of a blast furnace and flows through the tap water, the surface of the hot metal flow that flows through the tap water. The refining agent is injected into the hot metal flow by means of a conveying gas from a lance installed vertically away from the blast furnace, thereby stirring the hot metal as it falls from the tuyere of the blast furnace into the tap trough. A hot metal pretreatment method characterized in that the refining agent is added to the hot metal flow without using.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1148682A JPS58130208A (en) | 1982-01-29 | 1982-01-29 | Hot metal pretreatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1148682A JPS58130208A (en) | 1982-01-29 | 1982-01-29 | Hot metal pretreatment method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58130208A JPS58130208A (en) | 1983-08-03 |
| JPS6145681B2 true JPS6145681B2 (en) | 1986-10-09 |
Family
ID=11779371
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1148682A Granted JPS58130208A (en) | 1982-01-29 | 1982-01-29 | Hot metal pretreatment method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58130208A (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1985003525A1 (en) * | 1984-02-04 | 1985-08-15 | Nippon Kokan Kabushiki Kaisha | Device for removing impurities contained in melted iron flowing from shaft furnace |
| JPS60162717A (en) * | 1984-02-04 | 1985-08-24 | Nippon Kokan Kk <Nkk> | How to process hot metal |
| JPS61159508A (en) * | 1984-12-29 | 1986-07-19 | Nippon Steel Corp | Method for out-of-furnace component adjustment of molten metal |
| JPS61209933A (en) * | 1985-03-14 | 1986-09-18 | 日本鋼管株式会社 | Treatment of molten slag produced upon removing impurities from molten iron in middle of launder |
| JPS61155356U (en) * | 1985-03-14 | 1986-09-26 | ||
| JPS61210109A (en) * | 1985-03-14 | 1986-09-18 | Nippon Kokan Kk <Nkk> | Method for removing impurities from hot metal in the middle of the tap hole |
| JPS63171819A (en) * | 1987-01-09 | 1988-07-15 | Sumitomo Metal Ind Ltd | Control apparatus for optimum blowing quantity of molten iron treating agent |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4831810A (en) * | 1971-08-30 | 1973-04-26 | ||
| JPS51105914A (en) * | 1975-03-14 | 1976-09-20 | Sumitomo Metal Ind | |
| JPS5837939Y2 (en) * | 1978-05-10 | 1983-08-27 | 新日本製鐵株式会社 | Continuous processing equipment for hot metal |
-
1982
- 1982-01-29 JP JP1148682A patent/JPS58130208A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58130208A (en) | 1983-08-03 |
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