WO2020189393A1 - 開孔ビットおよびそれを用いた出銑口の開孔方法 - Google Patents
開孔ビットおよびそれを用いた出銑口の開孔方法 Download PDFInfo
- Publication number
- WO2020189393A1 WO2020189393A1 PCT/JP2020/010162 JP2020010162W WO2020189393A1 WO 2020189393 A1 WO2020189393 A1 WO 2020189393A1 JP 2020010162 W JP2020010162 W JP 2020010162W WO 2020189393 A1 WO2020189393 A1 WO 2020189393A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- opening
- bit
- furnace
- hole
- tip
- Prior art date
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/12—Opening or sealing the tap holes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/15—Tapping equipment; Equipment for removing or retaining slag
- F27D3/1509—Tapping equipment
- F27D3/1527—Taphole forming equipment, e.g. boring machines, piercing tools
-
- 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
- C21C5/4653—Tapholes; Opening or plugging thereof
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Definitions
- the present invention is an opening bit for opening a tap of a blast furnace, etc., and is particularly used for drilling a hole for installing a burner lance used at the start-up of a wind break at the tap.
- the present invention relates to a hole opening bit and a method for opening a tap hole using the hole opening bit.
- the blast furnace iron ore is heated, reduced, and melted by the high-temperature air blown from the tuyere and the high-temperature reducing gas generated by the reaction of oxygen with coke and pulverized coal. It is a facility that produces slag.
- the reaction heat in the furnace and the heat supply from the tuyere are balanced, so that stable operation of the blast furnace is possible.
- it may be necessary to stop blowing air to the blast furnace due to operational troubles, equipment troubles, or production adjustment of the blast furnace.
- the temperature of the charged material and the melt in the furnace (hereinafter referred to as the furnace heat) decreases due to heat removal from the furnace body and bottom, air suction from the tuyere, and the like.
- the viscosity of the slag increases, making it difficult to discharge the hot metal slag from the taps installed below the tuyere level.
- the air is blown in such a state, the liquid level of the hot metal slag (hot metal or molten slag or a mixture thereof) in the lower part of the furnace is raised by the hot metal and slag generated by the high temperature gas generated in front of the tuyere.
- the hot metal slag supplied from the upper part of the tuyere raises the temperature of the hot metal slag remaining in the furnace bottom and gradually recovers to an appropriate furnace heat level.
- Another method is to install a burner at the ironing port provided at the bottom of the blast furnace to burn the fuel, raise the temperature of the bottom efficiently, and start up from a long wind break in a short time.
- a method for starting ventilation of a blast furnace and a burner for raising the temperature of the furnace bottom have been proposed (Patent Document 1). Further, in order to discharge the hot metal in the blast furnace to the outside, a perforation bit for making a hole in the hot metal outlet has been proposed (Patent Documents 2 and 3).
- the tip of the opening bit is melted by the high temperature of the hot metal flowing out of the furnace. Further, since the pressure inside the furnace is applied, a force for pushing the opening bit to the outside is applied, so that it takes less time to pull out the opening bit.
- the timing of opening the tap to install a burner for raising the temperature of the furnace bottom and a lance (hereinafter collectively referred to as a burner lance) having a function of blowing a flammable gas for raising the temperature of the furnace bottom. Is on holiday.
- An object of the present invention is to efficiently raise the temperature of the bottom of the blast furnace at a position lower than the tuyere height, so that it is possible to start up from a long wind break or a furnace cooling accident in a relatively short time.
- the present invention is to propose an opening bit that can simplify the opening work of the outlet for installing a burner lance for raising the temperature of the bottom of the furnace, and a method for opening the outlet using the bit.
- the present invention is an opening bit used for opening a hot metal outlet at the bottom of a blast furnace, and has a tip on the back surface of the drilling surface in the furnace of the opening bit, and the tip is said to be said.
- An opening bit whose outermost end of the tip is located inside the outermost end of the opening bit.
- the present invention is a method of opening a hole for installing a burner lance for raising the temperature of the furnace bottom at the ironing port of the bottom of the blast furnace, and uses a hole opening machine provided with the above-mentioned opening bit.
- This is a method of opening a tap, which is a method of opening a tap.
- the opening bit of the present invention since the chip is attached to the back surface of the drilling surface in the furnace, the opening bit is moved out of the furnace even when the melt flowing back at the time of opening flows into the outside of the furnace.
- the molten material that has flowed into the outside of the furnace can be excavated by the chip provided on the back surface, so that the opening bit can be discharged to the outside of the furnace.
- FIG. 1 is a schematic diagram for explaining a configuration of an example of an opening bit of the present invention.
- the opening bit 1 has a tip 2 attached to the excavation surface 1a inside the furnace, and the tip 2 is also attached to the back surfaces 1b and 1c of the excavation surface 1a.
- the tip 2 is made of a material that is harder than the substance to be excavated, and cuts the object by coming into contact with the substance to be excavated. Cemented carbide is generally used as the material, and it is sometimes called by a name such as a cemented carbide tip or a blade.
- the chip 2 can be attached by a method such as welding.
- Reference numeral 3 denotes an opening rod for supporting the opening bit 1.
- the back surface of the excavation surface of the perforation bit 1 is the surface 1b of the surfaces 1a, 1b, and 1c on which the tip 2 is attached, which is closer to the perforation rod 3 than the position of the attachment surface having the maximum diameter.
- the back surface of the excavation surface is a surface that comes into contact with the melt when the opening bit is pulled back when the melt flows into the outside of the furnace of the opening bit.
- the tip attached to the back surface is preferably attached at a position where the opening bit comes into contact with the melt flowing into the outside of the furnace or the solidified body thereof when the opening bit is pulled back. Alternatively, it can be said that it is preferable to attach the tip to a position where it does not come into contact with the excavation object when advancing the opening bit.
- the opening bit generally used for opening a tap is the front surface of the opening bit, that is, the object to be excavated when the opening bit is advanced so that the object to be excavated can be cut when the opening bit is advanced.
- the chip is attached at a position where it comes into contact with (see, for example, Patent Documents 2 and 3).
- Patent Documents 2 and 3 the inventors have found that when it is necessary to install a burner lance for raising the temperature of the bottom of the furnace, there is a high possibility that the melt in the furnace will flow back along with the opening of the hole. That is, it has been found that the function of excavating when the opening bit is advanced is not sufficient, and it is effective to attach the tip 2 to the back surfaces 1b and 1c of the opening bit.
- the hard blade corresponding to the tip of the present invention is hard not only on the front surface of the perforated bit but also on the back surface closer to the perforated rod than the position of the mounting surface having the maximum diameter of the perforated bit. It is mounted so that the outermost end of the blade is outside the outermost end of the perforated bit.
- the hard blade of Patent Document 3 is installed so as to cover the front portion of the blow hole in order to suppress the blockage of the blow hole, and the outside of the furnace of the open bit when the bit is pulled back. It does not excavate the melt that has flowed into. That is, the function is different from that of the chip of the present invention.
- the tip is not attached at a position closer to the rod in the radial direction, that is, at a position where the outermost end of the tip is inside the outermost end of the opening bit. That is, in order to realize the function of excavating the melt that has flowed into the outside of the furnace when pulling back the bit, which is required in the present invention, the purpose of the present invention is to achieve the opening bit of Patent Document 3. Cannot be achieved.
- the tip is effective to attach the tip to a position where the outermost end of the tip is inside the outermost end of the opening bit. More specifically, the tip is installed so that the innermost point of the tip is located at a position inside the midpoint between the outer peripheral position of the rod and the outermost position of the perforated bit in the radial direction. It is preferable to have.
- the perforated bit 1 of the present invention has been suspended for a long time due to equipment troubles, operation troubles, equipment repairs, etc., and the furnace heat has dropped from the tap just before the start-up of the blast furnace.
- the tap is opened and a burner lance is installed to blow. It can contribute to shortening the time for opening the hole in the process of starting the filling.
- the melt cannot be sufficiently discharged to the outside of the furnace when the wind is closed, or if air is sucked from the tuyere or the like during the wind break, the melt is generated during the wind break and the bottom of the furnace.
- the melt level of the above is rising, the melt flows back into the tap when the hole is opened.
- the melt flows back into the ironing port in the same manner, so that the burner lance cannot be installed.
- the perforation bit is further pushed in, inserted into the coke filling layer in the furnace, the perforation bit is melted, and then the perforation rod is pulled back. In this case, the hole must be opened again, and the hole opening work takes time. Furthermore, if the perforation bit is separated from the perforation rod when it is returned to the outside of the furnace, it must be dissolved using oxygen. In this case, in addition to the oxygen cleaning work and the procedure for restarting the hole, it is difficult to carry out the above-mentioned work because the tapping hole closing material is melted and the opening depth becomes unclear due to the oxygen cleaning. In some cases,
- the tip 2 is tapped by rotation and impact.
- the mouth-blocking material and coke slag By scraping the mouth-blocking material and coke slag, it is possible to open holes and excavate both in and out of the furnace. Therefore, even in a situation where the melt flows back from the furnace, it is possible to open a hole for installing the burner lance while cooling the backflowing melt and pull back the opening bit. It has not been conventionally known how much load is applied to the bit or rod when pulling back the perforated bit with the tip attached to the back surface.
- the conditions in the examples are one condition example adopted for confirming the feasibility and effect of the present invention, and the present invention is described in this one condition example. It is not limited. In the present invention, various conditions can be adopted as long as the object of the present invention can be achieved without departing from the gist of the present invention.
- Example 1 A hole was opened at the tap to install a burner lance when the wind was normally closed. Two types of opening bits having a shape shown in FIG. 1 and having a maximum diameter of ⁇ 70 mm and a hole bit having a maximum diameter of ⁇ 110 mm were used for opening. After confirming the penetration with the ⁇ 70 mm perforated bit, the perforated rod could not be pulled back from inside the furnace. Therefore, when the perforated bit was hit and rotated in the opposite direction, the perforated bit was pulled back in a healthy state. Was done. In addition, from the confirmation of the inside of the ironing port, a solidified slag was confirmed in the vicinity where the opening bit could not be pulled out.
- the opening bit of the present invention is not damaged. I was able to confirm that I could pull back. Even when a ⁇ 110 mm perforated bit was used, the perforation and the bit could be pulled back in the same case.
- the perforation bit can be pulled back without damage even when the melt flows back into the ironing port. Therefore, the perforation bit of the present invention can be used in various vertical melting furnaces other than the blast furnace, in which such a situation is considered to occur as a perforation target.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Furnace Charging Or Discharging (AREA)
- Blast Furnaces (AREA)
Abstract
Description
(1)炉底昇温用のバーナーランスを設置するための孔を出銑口に開孔するために用いること、がより好ましい解決手段となるものと考えられる。
図1は、本発明の開孔ビットの一例の構成を説明するための模式図である。図1に示す例において、開孔ビット1は、炉内側の掘削面1aにチップ2を取付けるとともに、掘削面1aの背面1b、1cにもチップ2を取付けている。このチップ2は、掘削する対象の物質よりも硬い材料で作られており、掘削する対象の物質と接触することで、対象物を切削する。その材料としては一般に超硬合金が用いられ、超硬チップ、あるいは刃体などの名称で呼ばれることもある。チップ2の取り付けは溶接などの方法で実施することができる。なお、3は開孔ビット1を支持するための開孔ロッドである。
通常休風の立上げ時にバーナーランスを設置するために出銑口の開孔を実施した。開孔には図1に示す形状であって最大径がφ70mmの開孔ビットとφ110mmの開孔ビットの2種の開孔ビットを利用した。φ70mmの開孔ビットでの貫通確認後、炉内から開孔ロッドの引き戻しができなくなったため、開孔ビットに逆向きの打撃と回転を与えたところ、開孔ビットが健全な状態のまま引き戻すことが出来た。また、出銑口内部の確認から、開孔ビットが引き抜けなくなった付近にスラグの凝固物が確認された。これまでは、開孔ビットが開孔ロッドからとれるまで逆打を打ち続けるか、酸素による溶解を選択していた状況であったが、本発明の開孔ビットによれば、損傷なく開孔ビットを引き戻せることを確認できた。φ110mmの開孔ビットを用いた場合でも同様のケースで開孔とビットの引き戻しを行うことができた。
1a 掘削面
1b、1c 背面
2 チップ
3 開孔ロッド
Claims (3)
- 高炉の炉底の出銑口を開孔するために用いる開孔ビットであって、前記開孔ビットの炉内掘削面の背面にチップを有し、前記チップは、前記チップの最も外側の端が前記開孔ビットの最も外側の端よりも内側に位置する、開孔ビット。
- 高炉の炉底の出銑口を開孔するために用いる開孔ビットであって、炉底昇温用のバーナーランスを設置するための孔を出銑口に開孔するために用いる、請求項1に記載の開孔ビット。
- 高炉の炉底の出銑口に炉底昇温用のバーナーランスを設置するための孔を開孔する方法であって、請求項2に記載の開孔ビットを備える開孔機を用いて出銑口を開孔する、出銑口の開孔方法。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BR112021018500A BR112021018500A2 (pt) | 2019-03-19 | 2020-03-10 | Broca de abertura de orifício e método de abertura de orifício de drenagem usando o mesmo |
US17/439,219 US11821048B2 (en) | 2019-03-19 | 2020-03-10 | Hole-opening bit and tap hole opening method using same |
KR1020217025786A KR20210113670A (ko) | 2019-03-19 | 2020-03-10 | 개공 비트 및 그것을 이용한 출선구의 개공 방법 |
EP20772849.4A EP3943617A4 (en) | 2019-03-19 | 2020-03-10 | HOLE-OPENING DRILLS AND METHOD OF OPENING TAPHOLES WITH THEM |
JP2020560430A JP6881694B2 (ja) | 2019-03-19 | 2020-03-10 | 開孔ビットおよびそれを用いた出銑口の開孔方法 |
CN202080016917.4A CN113490754A (zh) | 2019-03-19 | 2020-03-10 | 开孔钻头以及使用其的出铁口的开孔方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2019-050676 | 2019-03-19 | ||
JP2019050676 | 2019-03-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2020189393A1 true WO2020189393A1 (ja) | 2020-09-24 |
Family
ID=72520325
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2020/010162 WO2020189393A1 (ja) | 2019-03-19 | 2020-03-10 | 開孔ビットおよびそれを用いた出銑口の開孔方法 |
Country Status (8)
Country | Link |
---|---|
US (1) | US11821048B2 (ja) |
EP (1) | EP3943617A4 (ja) |
JP (1) | JP6881694B2 (ja) |
KR (1) | KR20210113670A (ja) |
CN (1) | CN113490754A (ja) |
BR (1) | BR112021018500A2 (ja) |
TW (1) | TWI718031B (ja) |
WO (1) | WO2020189393A1 (ja) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11821048B2 (en) * | 2019-03-19 | 2023-11-21 | Jfe Steel Corporation | Hole-opening bit and tap hole opening method using same |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0370257U (ja) * | 1989-11-10 | 1991-07-15 | ||
JPH0514140U (ja) | 1991-08-12 | 1993-02-23 | 東邦金属株式会社 | 穿孔用ビツト |
JP2006307258A (ja) | 2005-04-27 | 2006-11-09 | Maruwa Giken:Kk | 出銑口開孔ビット |
JP2012062546A (ja) * | 2010-09-17 | 2012-03-29 | Tetsuo Harada | 穿孔ビット |
JP2016030833A (ja) | 2014-07-25 | 2016-03-07 | Jfeスチール株式会社 | 高炉の送風開始方法および炉床部昇温用バーナー |
Family Cites Families (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4784230A (en) | 1985-05-14 | 1988-11-15 | Cherrington Martin D | Apparatus and method for installing a conduit within an arcuate bore |
JP2733104B2 (ja) * | 1989-08-12 | 1998-03-30 | 松下電工株式会社 | 壁の構造 |
JP3302382B2 (ja) | 1991-07-08 | 2002-07-15 | 沖電気工業株式会社 | 受光回路 |
US6883624B2 (en) | 2003-01-31 | 2005-04-26 | Smith International, Inc. | Multi-lobed cutter element for drill bit |
US7040424B2 (en) | 2003-03-04 | 2006-05-09 | Smith International, Inc. | Drill bit and cutter having insert clusters and method of manufacture |
SE530135C2 (sv) | 2004-09-21 | 2008-03-11 | Sandvik Intellectual Property | Bergborrkrona anpassad för slående borrning |
SE530602C2 (sv) | 2004-11-17 | 2008-07-15 | Sandvik Intellectual Property | Bergborrkrona för slående borrning |
RU2325443C2 (ru) | 2006-06-08 | 2008-05-27 | ООО Камышинский завод бурового инструмента (КЗБИ) | Коронка для вскрытия леток доменной печи |
US8096373B2 (en) | 2008-04-04 | 2012-01-17 | Baker Hughes Incorporated | Rotary drill bits and drilling tools having protective structures on longitudinally trailing surfaces |
JP5848865B2 (ja) * | 2010-01-22 | 2016-01-27 | 株式会社丸和技研 | 高炉の開孔装置 |
CN201981229U (zh) * | 2011-03-03 | 2011-09-21 | 新兴铸管股份有限公司 | 转炉出钢口钻头 |
JP2014173146A (ja) | 2013-03-08 | 2014-09-22 | Konan Electric Co Ltd | 出銑口開孔ビット |
TWM482588U (zh) * | 2014-04-25 | 2014-07-21 | China Steel Corp | 高爐用開孔機之鑽頭 |
WO2017115097A1 (en) | 2015-12-29 | 2017-07-06 | Arcelormittal | Drill bit, tap hole drilling machine equipped with said drill bit, and process for making said drill bit |
CN106869800A (zh) * | 2017-03-15 | 2017-06-20 | 金陵科技学院 | 一种岩土防埋钻钻头 |
CN207435473U (zh) | 2017-04-11 | 2018-06-01 | 日照钢铁控股集团有限公司 | 一种高炉炉缸输氧装置 |
CN206783703U (zh) | 2017-05-22 | 2017-12-22 | 山西北方机械制造有限责任公司 | 一种拆炉机无芯轴扩孔钻头 |
HUP1700322A2 (hu) * | 2017-07-25 | 2019-01-28 | Constructeam Zrt | Járat bõvítõ eljárás és szerkezet annak megvalósítására |
CN107989550B (zh) * | 2017-12-28 | 2020-01-24 | 山东里能鲁西矿业有限公司 | 一种双向钻头 |
US11821048B2 (en) * | 2019-03-19 | 2023-11-21 | Jfe Steel Corporation | Hole-opening bit and tap hole opening method using same |
-
2020
- 2020-03-10 US US17/439,219 patent/US11821048B2/en active Active
- 2020-03-10 WO PCT/JP2020/010162 patent/WO2020189393A1/ja unknown
- 2020-03-10 BR BR112021018500A patent/BR112021018500A2/pt active Search and Examination
- 2020-03-10 EP EP20772849.4A patent/EP3943617A4/en active Pending
- 2020-03-10 CN CN202080016917.4A patent/CN113490754A/zh active Pending
- 2020-03-10 KR KR1020217025786A patent/KR20210113670A/ko not_active IP Right Cessation
- 2020-03-10 JP JP2020560430A patent/JP6881694B2/ja active Active
- 2020-03-17 TW TW109108828A patent/TWI718031B/zh active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0370257U (ja) * | 1989-11-10 | 1991-07-15 | ||
JPH0514140U (ja) | 1991-08-12 | 1993-02-23 | 東邦金属株式会社 | 穿孔用ビツト |
JP2006307258A (ja) | 2005-04-27 | 2006-11-09 | Maruwa Giken:Kk | 出銑口開孔ビット |
JP2012062546A (ja) * | 2010-09-17 | 2012-03-29 | Tetsuo Harada | 穿孔ビット |
JP2016030833A (ja) | 2014-07-25 | 2016-03-07 | Jfeスチール株式会社 | 高炉の送風開始方法および炉床部昇温用バーナー |
Also Published As
Publication number | Publication date |
---|---|
TW202037724A (zh) | 2020-10-16 |
EP3943617A4 (en) | 2022-05-18 |
JP6881694B2 (ja) | 2021-06-02 |
US11821048B2 (en) | 2023-11-21 |
CN113490754A (zh) | 2021-10-08 |
US20220162717A1 (en) | 2022-05-26 |
TWI718031B (zh) | 2021-02-01 |
EP3943617A1 (en) | 2022-01-26 |
BR112021018500A2 (pt) | 2021-11-30 |
KR20210113670A (ko) | 2021-09-16 |
JPWO2020189393A1 (ja) | 2021-04-01 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2020189393A1 (ja) | 開孔ビットおよびそれを用いた出銑口の開孔方法 | |
WO2020196360A1 (ja) | 炉底の昇温方法およびそれに用いるバーナーランス | |
JP6544175B2 (ja) | 高炉炉底部における装入物および炉内残留物の昇温方法 | |
EP3237131B1 (en) | Method of sealing and repairing a refractory tap hole | |
JP2009074119A (ja) | 溶鉄製造方法 | |
JP4985027B2 (ja) | 出銑口開孔装置、及び出銑口閉塞装置 | |
RU226787U1 (ru) | Долото для вскрытия выпускного отверстия | |
JP5920026B2 (ja) | 転炉底吹き羽口の熱間設置方法 | |
JP2568395Y2 (ja) | 電気炉の偏心炉底出鋼口詰まり物除去装置 | |
RU2784402C1 (ru) | Способ прогрева лещади доменной печи и используемая в способе фурма горелки | |
CN215628063U (zh) | 一种高炉开口机钻杆强制定位装置 | |
BR112021018826B1 (pt) | Método de aquecer um fundo de forno e lança de queimador usada no método | |
JP2572187B2 (ja) | 出銑樋残銑抜き装置およびそのストッパ操作装置 | |
KR100754149B1 (ko) | 고로의 종풍 조업 방법 | |
KR20030035557A (ko) | 고로 출선구 개공기 | |
JP2006137985A (ja) | 高炉改修時の操業方法 | |
JPH05295411A (ja) | 高炉操業方法 | |
JPH02290491A (ja) | 溶融炉における残銑抜取口の開口方法 | |
JP2001064706A (ja) | 高炉操業方法 | |
JPS63131982A (ja) | 出湯口の補修方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
ENP | Entry into the national phase |
Ref document number: 2020560430 Country of ref document: JP Kind code of ref document: A |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 20772849 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 20217025786 Country of ref document: KR Kind code of ref document: A |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
REG | Reference to national code |
Ref country code: BR Ref legal event code: B01A Ref document number: 112021018500 Country of ref document: BR |
|
ENP | Entry into the national phase |
Ref document number: 2020772849 Country of ref document: EP Effective date: 20211019 |
|
ENP | Entry into the national phase |
Ref document number: 112021018500 Country of ref document: BR Kind code of ref document: A2 Effective date: 20210917 |