JP2897656B2 - How to remove ingots in converter - Google Patents
How to remove ingots in converterInfo
- Publication number
- JP2897656B2 JP2897656B2 JP26540094A JP26540094A JP2897656B2 JP 2897656 B2 JP2897656 B2 JP 2897656B2 JP 26540094 A JP26540094 A JP 26540094A JP 26540094 A JP26540094 A JP 26540094A JP 2897656 B2 JP2897656 B2 JP 2897656B2
- Authority
- JP
- Japan
- Prior art keywords
- metal
- oxygen
- injection port
- lance
- converter
- 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.)
- Ceased
Links
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、例えば脱リン等を行う
溶銑の予備処理時に転炉内及び炉口に堆積する地金を除
去する方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing metal that accumulates in a converter and at a furnace opening during pretreatment of hot metal, for example, for dephosphorization.
【０００２】[0002]
【従来の技術】転炉内溶銑を例えば脱リン処理する場合
には脱リン平衡に有利な低温域で行われるために溶銑が
炉内壁面に付着，固化し、地金が堆積する。この地金の
堆積によって転炉への溶銑の注銑が困難となると共に、
歩留りの低下を招く。また、転炉の修復作業が困難とな
る。2. Description of the Related Art When hot metal in a converter is subjected to, for example, dephosphorization, it is performed in a low-temperature region that is advantageous for dephosphorization equilibrium. This accumulation of metal makes it difficult to pour hot metal into the converter,
This leads to a decrease in yield. In addition, repair work of the converter becomes difficult.
【０００３】ところで、従来より転炉炉内及び炉口に堆
積する地金を除去する方法及びランスが研究開発されて
おり、その方法及びランスとして、ＣＯガスの２次燃
焼を促進し、２次燃焼による熱付与によって地金を溶解
する方法（特開平１−２５２７２１号、特公平３−７７
２４８号等）、地金溶断用のランスあるいはランス取
付装置（特開平１−１３６９２３号、特公昭６１−６０
８８７号等）が提案されている。[0003] By the way, a method and a lance for removing ingots deposited in the converter furnace and at the furnace opening have been researched and developed, and the method and the lance promote the secondary combustion of CO gas, A method of melting metal by applying heat by combustion (Japanese Patent Laid-Open No. 1-252721, Japanese Patent Publication No. 3-77
No. 248, etc.) and a lance or lance mounting device for melting metal (Japanese Patent Laid-Open No. 1-136923, Japanese Patent Publication No. 61-60)
No. 887).
【０００４】[0004]
【発明が解決しようとする課題】このうち、の方法で
は容易に地金を溶解できるという利点があるが、酸素供
給によってスラグ中の粒鉄が酸化し、ＦｅＯの含有率が
上昇してＭｎ歩留りの低下及びスロッピングの発生を引
き起こすという問題を有している。さらに、２次燃焼に
よって炉内が高温になるために炉内耐火物の溶損が激し
い。Among these methods, there is an advantage that the metal can be easily melted, but the iron in the slag is oxidized by the supply of oxygen, and the content of FeO increases to increase the Mn yield. This causes a problem of causing a decrease in the temperature and occurrence of slopping. Further, since the inside of the furnace is heated to a high temperature by the secondary combustion, melting of the refractory in the furnace is severe.
【０００５】また、の地金溶断用のランスあるいはラ
ンス取付装置は、処理終了後に転炉炉内に装入され、酸
素を噴射して地金を溶断するものであるが、ランスある
いはランス取付装置を準備する時間が必要である。その
ために、低温域で処理を行う溶銑予備処理においては地
金の表面温度が低下し、酸素を地金に吹き付けても着火
せず、地金の溶断効率が悪化する。さらに最悪の場合に
は除去不能となる。A lance or lance mounting device for fusing a metal is charged into a converter furnace after the treatment is completed, and injects oxygen to blow the lance or a lance mounting device. Need time to prepare. For this reason, in the hot metal pretreatment performed in a low temperature range, the surface temperature of the metal decreases, and even if oxygen is sprayed on the metal, the metal does not ignite and the efficiency of melting the metal deteriorates. In the worst case, it cannot be removed.
【０００６】本発明は、上記した問題に鑑みて成された
ものであり、溶銑の予備処理時において炉内耐火物の溶
損を抑制すると共に、容易に地金を溶断できる転炉内付
着地金の除去方法を提供することを目的としている。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and suppresses erosion of refractories in a furnace during pretreatment of hot metal, and furthermore, deposits in a converter capable of easily fusing the metal. It is intended to provide a method for removing gold.
【０００７】[0007]
【課題を解決するための手段】上記した目的を達成する
ために、本発明方法は、溶銑の予備処理時に、ランスの
先端に開設した先端噴射口から溶銑に酸素を噴射しなが
ら、前記先端噴射口から所定の間隔を存した上方位置側
面に開設した、径がφ１ｍｍ以上、φ１５ｍｍ以下の噴
射口から、水平を基準として−４５°〜７０°の範囲
で、炉内壁面に向けて酸素を噴射するのである。In order to achieve the above object, the method of the present invention is characterized in that, at the time of pretreatment of hot metal, the hot metal is injected into the hot metal from a hot jet opening formed at the tip of a lance while injecting oxygen into the hot metal. A range of -45 ° to 70 ° with respect to the horizontal from an outlet having a diameter of φ1 mm or more and φ15 mm or less, which is opened on an upper side surface at a predetermined distance from the mouth.
Then, oxygen is injected toward the inner wall of the furnace.
【０００８】[0008]
【作用】本発明方法は、溶銑の予備処理時に、ランスの
先端に開設した先端噴射口から溶銑に酸素を噴射しなが
ら、前記先端噴射口から所定の間隔を存した上方位置側
面に開設した、径がφ１ｍｍ以上、φ１５ｍｍ以下の噴
射口から、水平を基準として−４５°〜７０°の範囲
で、炉内壁面に向けて酸素を噴射するので、予備処理と
同時に炉内壁面に堆積した地金は酸素噴射によって溶断
される。According to the method of the present invention, at the time of pretreatment of hot metal, oxygen is injected into the hot metal from a tip injection port opened at the tip of a lance, and is opened on an upper position side surface at a predetermined distance from the tip injection port . A range of -45 ° to 70 ° from the horizontal from a nozzle having a diameter of φ1 mm or more and φ15 mm or less.
Then, since oxygen is injected toward the furnace inner wall surface, the metal deposited on the furnace inner wall surface at the same time as the pretreatment is blown off by the oxygen injection.
【０００９】[0009]
【実施例】以下、本発明の一実施例を添付した図面に基
づいて説明する。図１は本発明に使用するランスの構成
を示した図であって、（ａ）は先端部を断面して示した
図、（ｂ）は（ａ）のＡ−Ａ断面図、図２はランスを転
炉に装入した状態を示した図であって、（ａ）はその縦
断面図、（ｂ）は（ａ）のＢ−Ｂ断面図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. FIGS. 1A and 1B are views showing the configuration of a lance used in the present invention, wherein FIG. 1A is a cross-sectional view of the tip, FIG. 1B is a cross-sectional view taken along line AA of FIG. It is the figure which showed the state which inserted the lance in the converter, (a) is the longitudinal section, (b) is BB sectional drawing of (a).
【００１０】図面において、１は本発明方法を実施する
ために転炉２内に挿入されるランスであって、例えば３
重管構成された内筒１ａを酸素流路５として、その先端
の先端噴射口４から溶銑３に酸素を噴射すると共に、冷
却水は内筒１ａと中間筒１ｂで構成される環状空間８ａ
を通って先端側で中間筒１ｂと外筒１ｃで構成される環
状空間８ｂに至る冷却水流路８を通りランス１を水冷す
る構成である。そして、このランス１はさらに前記先端
噴射口４から所定の間隔を存した上方位置側面から酸素
を噴射できるように前記酸素流路５から側面に開設した
噴射口６に連通する副酸素流路７が例えば転炉２のトラ
ニオン側及び排滓側の３ヵ所に設けられている。In the drawings, reference numeral 1 denotes a lance inserted into a converter 2 for carrying out the method of the present invention.
The inner cylinder 1a formed as a double tube is used as an oxygen flow path 5, oxygen is injected from the tip injection port 4 at the tip of the inner pipe 1a to the hot metal 3, and the cooling water is formed into an annular space 8a composed of the inner cylinder 1a and the intermediate cylinder 1b.
The lance 1 is water-cooled through a cooling water flow path 8 which passes through the cooling water flow path 8 to the annular space 8b formed by the intermediate cylinder 1b and the outer cylinder 1c at the distal end side. The lance 1 further has a sub-oxygen flow path 7 communicating from the oxygen flow path 5 to an injection port 6 formed on the side so that oxygen can be injected from an upper side surface at a predetermined distance from the tip injection port 4. Are provided at three places, for example, on the trunnion side and the waste side of the converter 2.
【００１１】本発明方法は、上記した構成のランス１を
用いて転炉２内に付着した地金９の除去を行うのであっ
て、転炉２内にランス１を挿入した後に、先端噴射口４
から溶銑３に酸素を噴射して吹錬予備処理を行うと同時
に、副酸素流路７を介して噴射口６より炉内壁面２ａに
酸素を噴射する。この時、炉内壁面２ａに堆積した地金
９の表面温度は高温の状態にあるので、地金９は噴射口
６より吹き付けられた酸素と反応して溶断される。According to the method of the present invention, the metal 9 adhered to the converter 2 is removed by using the lance 1 having the above-described structure. 4
At the same time, oxygen is injected into the hot metal 3 to perform the blowing preliminary treatment, and at the same time, oxygen is injected from the injection port 6 to the furnace inner wall surface 2 a through the auxiliary oxygen flow path 7. At this time, since the surface temperature of the metal 9 deposited on the furnace inner wall surface 2a is in a high temperature state, the metal 9 reacts with oxygen blown from the injection port 6 and is blown.
【００１２】先端噴射口として直径φ３５ｍｍ、傾斜角
１３°のラバールノズルを４個形成し、炉内壁面に酸素
を噴射する噴射口としてトラニオン側に直径φ１０ｍｍ
のストレートノズルを、排滓側に直径φ７ｍｍのストレ
ートノズルを先端噴射口より３５０ｍｍ上方位置に形成
したランスを、先端噴射口と溶銑との間隔が１．４ｍと
なるように炉内に挿入し、ランス前圧４．０ｋｇ／ｃｍ
2 、酸素流量１２０００Ｎｍ3 ／ｈｒの条件で吹錬予備
処理を行った。なお、この時の先端噴射口から噴射され
る酸素流量は１１４３０Ｎｍ3 ／ｈｒ、トラニオン側噴
射口から噴射される酸素流量は２３０Ｎｍ3 ／ｈｒ、排
滓側噴射口から噴射される酸素流量は１１０Ｎｍ3 ／ｈ
ｒである。Four Laval nozzles having a diameter of φ35 mm and an inclination angle of 13 ° are formed as tip injection ports, and a diameter of φ10 mm is formed on the trunnion side as an injection port for injecting oxygen to the inner wall of the furnace.
A straight nozzle having a diameter of 7 mm on the waste side and a lance formed at a position 350 mm above the tip injection port is inserted into the furnace such that the distance between the tip injection port and the hot metal is 1.4 m, Lance front pressure 4.0kg / cm
2. Blowing pretreatment was performed under the conditions of an oxygen flow rate of 12000 Nm 3 / hr. The oxygen flow injected from the tip injection port at this time 11430Nm 3 / hr, flow rate of oxygen is injected from the trunnion side injection port 230 nm 3 / hr, the oxygen flow injected from Haikasu side injection port 110 nm 3 / H
r.
【００１３】上記の吹錬予備処理を行った結果、図３に
示すように、副酸素流路の噴射口から酸素を噴射された
炉内壁面に約２ＴＯＮの地金溶解が確認され、その他の
部分には地金溶解が確認されなかった。また、耐火物の
溶損も確認されなかった。As a result of performing the above-mentioned blowing pretreatment, as shown in FIG. 3, about 2 TON of metal was melted on the inner wall of the furnace where oxygen was injected from the injection port of the auxiliary oxygen flow path. No metal dissolution was confirmed in the part. In addition, no erosion of the refractory was confirmed.
【００１４】本発明方法において、炉内壁面に噴射され
る酸素量は噴射口の断面積に比例するので、噴射口の断
面積を変えることによって酸素流量を制御できる。ま
た、噴射口の傾斜角を変えたり、位置を変えることによ
って炉内壁面の任意の位置に堆積している地金に対して
酸素を噴射できる。In the method of the present invention, since the amount of oxygen injected into the furnace inner wall surface is proportional to the cross-sectional area of the injection port, the flow rate of oxygen can be controlled by changing the cross-sectional area of the injection port. Also, by changing the inclination angle or the position of the injection port, it is possible to inject oxygen to the metal that is deposited at an arbitrary position on the furnace inner wall surface.
【００１５】次に、ランスの所定位置に所定の傾斜角
度，断面積を有する噴射口を開設する方法について説明
する。 炉内の地金堆積状況、すなわち地金の堆積位置，堆積
量を確認すると同時に、地金と相対するランス上の位置
を確認する。 地金と相対するランスの側面にランス中心部の酸素流
路に達する孔を開孔し、この孔と合致するように事前に
加工した銅鋳物を前記孔に挿入した後に、溶接固着して
孔を閉塞する。Next, a method of opening an injection port having a predetermined inclination angle and a predetermined sectional area at a predetermined position of the lance will be described. At the same time, the state of metal ingot in the furnace, that is, the position and amount of metal ingot, is confirmed, and at the same time, the position on the lance facing the metal is confirmed. A hole reaching the oxygen flow path at the center of the lance is opened in the side surface of the lance facing the metal, and a copper casting previously processed to match the hole is inserted into the hole, and then the hole is fixed by welding. Close.
【００１６】前記銅鋳物に、地金の溶断に十分な量の
酸素を噴射可能な副酸素流路を地金に対向した傾斜角度
で開孔する。なお、この開孔作業はキリで十分であり、
噴射口の径はφ１ｍｍ〜φ１５ｍｍ，副酸素流路の傾斜
角度は水平を基準として−４５°〜７０°とする。ここ
で、噴射口の径がφ１ｍｍ未満であると噴射される酸素
量が少なくて地金を溶断できず、径がφ１５ｍｍを超え
ると噴射される酸素量が多く、炉内耐火物を傷める。ま
た、−４５°〜７０°の範囲から外れた傾斜角度の副酸
素流路を設けると、地金までの酸素噴射距離が大きくな
って地金溶断に寄与しない。 地金溶断後は、噴射口を溶接によって閉塞する。以上
のように、地金が堆積する毎にランスに噴射口を開設し
て地金を除去する。なお、図１ではランスに開設した噴
射口を拡大して描いている。In the copper casting, a sub-oxygen flow path capable of injecting a sufficient amount of oxygen for fusing the metal is opened at an inclination angle facing the metal. In addition, this drilling work is enough with a drill,
The diameter of the injection port is φ1 mm to φ15 mm, and the inclination angle of the auxiliary oxygen channel is −45 ° to 70 ° with respect to the horizontal. Here, if the diameter of the injection port is less than φ1 mm, the amount of oxygen injected is small and the base metal cannot be blown out. If the diameter exceeds φ15 mm, the amount of injected oxygen is large and damages the refractory in the furnace. Further, when the auxiliary oxygen flow path having an inclination angle deviating from the range of -45 ° to 70 ° is provided, the oxygen injection distance to the base metal becomes large and does not contribute to the base metal fusing. After the metal is blown, the injection port is closed by welding. As described above, every time the metal is deposited, the injection port is opened in the lance to remove the metal. In FIG. 1, the injection port opened in the lance is illustrated in an enlarged manner.
【００１７】[0017]
【発明の効果】以上説明したように、本発明によれば予
備処理を行いながら炉内壁面に堆積した地金を溶断する
ので、溶銑の注銑が容易となると共に、歩留りが向上す
る。さらに、炉内耐火物の溶損がないので、転炉の長寿
命化が可能となる。As described above, according to the present invention, the base metal deposited on the inner wall of the furnace is blown off while performing the pretreatment, so that the hot metal is easily poured and the yield is improved. Furthermore, since there is no melting of the refractory in the furnace, the life of the converter can be extended.
【図面の簡単な説明】[Brief description of the drawings]
【図１】本発明に使用するランスの構成を示した図であ
って、（ａ）は先端部を断面して示した図、（ｂ）は
（ａ）のＡ−Ａ断面図である。FIGS. 1A and 1B are diagrams showing a configuration of a lance used in the present invention, in which FIG. 1A is a diagram showing a cross section of a distal end portion, and FIG. 1B is a cross-sectional view taken along line AA of FIG.
【図２】ランスを転炉に装入した状態を示した図であっ
て、（ａ）はその縦断面図、（ｂ）は（ａ）のＢ−Ｂ断
面図である。FIGS. 2A and 2B are views showing a state in which a lance is charged into a converter, where FIG. 2A is a longitudinal sectional view and FIG. 2B is a sectional view taken along line BB of FIG.
【図３】本発明による地金除去の状態を示した図であ
る。FIG. 3 is a diagram showing a state of metal removal according to the present invention.
１ ランス ２ 転炉 ２ａ 炉内壁面 ３ 溶銑 ４ 先端噴射口 ５ 酸素流路 ６ 噴射口 ７ 副酸素流路 DESCRIPTION OF SYMBOLS 1 Lance 2 Converter 2a Furnace inner wall surface 3 Hot metal 4 Tip injection port 5 Oxygen channel 6 Injection port 7 Secondary oxygen channel
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平１−104708（ＪＰ，Ａ) 特開 平６−248323（ＪＰ，Ａ) 特開 昭61−139616（ＪＰ，Ａ) 実開 平４−84346（ＪＰ，Ｕ) 実公 昭59−10120（ＪＰ，Ｙ２) 新日鉄技報，Ｎｏ．351（1994）ＰＰ. 47−51 (58)調査した分野(Int.Cl.6，ＤＢ名) C21C 5/46 104 C21C 1/00 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-104708 (JP, A) JP-A-6-248323 (JP, A) JP-A-61-139616 (JP, A) 84346 (JP, U) Jiko 59-10120 (JP, Y2) Nippon Steel Technical Report, No. 351 (1994) PP. 47-51 (58) Fields investigated (Int. Cl. 6 , DB name) C21C 5/46 104 C21C 1/00
Claims (1)
設した先端噴射口から溶銑に酸素を噴射しながら、前記
先端噴射口から所定の間隔を存した上方位置側面に開設
した、径がφ１ｍｍ以上、φ１５ｍｍ以下の噴射口か
ら、水平を基準として−４５°〜７０°の範囲で、炉内
壁面に向けて酸素を噴射することを特徴とする転炉内付
着地金の除去方法。At the time of pretreatment of hot metal, while injecting oxygen to the hot metal from a tip injection port opened at a tip of a lance , a diameter of φ1 mm is established on a side surface at an upper position at a predetermined interval from the tip injection port. As described above, a method for removing adhered metal in a converter, wherein oxygen is injected from an injection port having a diameter of 15 mm or less toward a furnace inner wall surface in a range of -45 ° to 70 ° with respect to the horizontal .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26540094A JP2897656B2 (en) | 1994-10-28 | 1994-10-28 | How to remove ingots in converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26540094A JP2897656B2 (en) | 1994-10-28 | 1994-10-28 | How to remove ingots in converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08127812A JPH08127812A (en) | 1996-05-21 |
| JP2897656B2 true JP2897656B2 (en) | 1999-05-31 |
Family
ID=17416646
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26540094A Ceased JP2897656B2 (en) | 1994-10-28 | 1994-10-28 | How to remove ingots in converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2897656B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4686880B2 (en) * | 2001-03-23 | 2011-05-25 | Ｊｆｅスチール株式会社 | Hot phosphorus dephosphorization method |
| JP4715384B2 (en) * | 2005-08-19 | 2011-07-06 | Ｊｆｅスチール株式会社 | Method for dephosphorizing hot metal and top blowing lance for dephosphorization |
| KR101363924B1 (en) * | 2012-08-10 | 2014-02-18 | 주식회사 포스코 | Treatment apparatus for molten metal |
| KR101709137B1 (en) * | 2015-08-13 | 2017-02-23 | 주식회사 포스코 | The converter operation method |
-
1994
- 1994-10-28 JP JP26540094A patent/JP2897656B2/en not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| 新日鉄技報，Ｎｏ．３５１（１９９４）ＰＰ．４７−５１ |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08127812A (en) | 1996-05-21 |
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