WO1994024503A1 - Dc arc furnace - Google Patents
Dc arc furnace Download PDFInfo
- Publication number
- WO1994024503A1 WO1994024503A1 PCT/JP1994/000617 JP9400617W WO9424503A1 WO 1994024503 A1 WO1994024503 A1 WO 1994024503A1 JP 9400617 W JP9400617 W JP 9400617W WO 9424503 A1 WO9424503 A1 WO 9424503A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- furnace
- raw material
- scrap
- arc
- furnace body
- Prior art date
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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
- C21C5/527—Charging of the electric furnace
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
- F27B3/08—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces heated electrically, with or without any other source of heat
-
- 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
- C21C5/52—Manufacture of steel in electric furnaces
- C21C5/5229—Manufacture of steel in electric furnaces in a direct current [DC] electric arc furnace
-
- 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
- C21C5/56—Manufacture of steel by other methods
- C21C5/562—Manufacture of steel by other methods starting from scrap
- C21C5/565—Preheating of scrap
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
- F27B3/10—Details, accessories, or equipment peculiar to hearth-type furnaces
- F27B3/18—Arrangements of devices for charging
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
- F27B3/10—Details, accessories, or equipment peculiar to hearth-type furnaces
- F27B3/18—Arrangements of devices for charging
- F27B3/183—Charging of arc furnaces vertically through the roof, e.g. in three points
-
- 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
- F27D11/00—Arrangement of elements for electric heating in or on furnaces
- F27D11/08—Heating by electric discharge, e.g. arc discharge
- F27D11/10—Disposition of electrodes
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B7/00—Heating by electric discharge
- H05B7/02—Details
- H05B7/11—Arrangements for conducting current to the electrode terminals
-
- 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
- C21C5/52—Manufacture of steel in electric furnaces
- C21C5/5229—Manufacture of steel in electric furnaces in a direct current [DC] electric arc furnace
- C21C2005/5235—Manufacture of steel in electric furnaces in a direct current [DC] electric arc furnace with bottom electrodes
-
- 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
- F27D13/00—Apparatus for preheating charges; Arrangements for preheating charges
- F27D13/002—Preheating scrap
-
- 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
- F27D99/00—Subject matter not provided for in other groups of this subclass
- F27D99/0001—Heating elements or systems
- F27D99/0006—Electric heating elements or system
- F27D2099/0021—Arc heating
- F27D2099/0023—DC arc heating
-
- 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
- F27D3/0025—Charging or loading melting furnaces with material in the solid state
- F27D3/0032—Charging or loading melting furnaces with material in the solid state using an air-lock
-
- 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
- F27D3/04—Ram or pusher apparatus
-
- 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 relates to a DC arc furnace for melting a raw material such as a cold iron source using a scrub or pig iron as a block (hereinafter referred to as a scrap raw material).
- a raw material such as a cold iron source using a scrub or pig iron as a block
- the DC arc furnace has a furnace body 2 having a bottom electrode 1 (anode) at a lower part, a furnace lid 3 provided to close an upper part of the furnace body 2, and a vertically penetrating center of the furnace lid 3.
- An electrode lifting / lowering device 7 attached to the opening / closing device 6 and raising / lowering the upper electrode 4 is provided.
- the furnace body 2 is rotatably supported on a lower frame 8 via a locker 9, and when the furnace lid 3 is removed, the furnace body 2 is tilted by the operation of the tilt drive device 10. Then, the molten metal 11 inside is taken out from the tap hole 12 to the ladle 14 on the ladle truck 13.
- the furnace lid 3 is raised and rotated outward by the furnace lid opening / closing device 6.
- scrap raw material 15 preheated by a preheating device provided at a different position (not shown) is charged into the furnace main body 2 using a bucket or the like.
- the furnace body 2 is closed by the lid 3, the upper electrode 4 is lowered to a predetermined position while the inside of the furnace body 2 is sucked by the dust collection duct 5, and electricity is supplied between the electrodes 1 and 4 to generate an arc 16.
- the scrap material 15 is dissolved while being held.
- the scrap material 15 has a very small weight relative to its volume, it is not possible to obtain a desired amount of molten metal by one melting, and after one melting, the electrode is melted.
- the power supply between 1 and 4 was stopped, the furnace lid 3 was opened, scrap material 15 was added again, and the same melting operation as above was repeated several times.
- the main body 2 is tilted by the tilt drive device 10 to take out the molten metal 11 from the tapping port 12 to the ladle 14.
- a continuous charging type direct current arc furnace has been conceived which solves the problem of opening and closing the furnace lid 3 and the problem of flickering by charging the inside of the furnace.
- the additional charging of the scrubbing material 15 is performed from the side with respect to the upper electrode 4.
- the charged scrap material 15 is always supplied so as to form a mountain at a position offset in the furnace main body 2, and thereby the temperature distribution in the furnace main body 2 becomes asymmetric, so that a separate heating device is used.
- the melting efficiency is greatly reduced due to the necessity of melting, the melting time is delayed due to unmelted residue, etc., and the melting mainly at the offset position near the furnace peripheral wall 23 of the furnace body 2 is mainly performed. For this reason, the furnace main body 2 had problems such as being susceptible to local wear.
- the present invention has been made in view of the above-mentioned conventional problems, in which the scrap material is continuously charged between the two upper electrodes, and the arc of both electrodes is used as the scrap material at the center of the furnace body.
- the upper electrode in a state in which a required amount of scrap raw material is charged into the furnace body closed by the furnace lid, the upper electrode is lowered to a predetermined position, and electricity is supplied between the bottom electrode and the upper electrode. Dissolves raw materials while generating and holding an arc. As the dissolution of the raw material progresses, the raw material is continuously charged from the raw material inlet at a constant rate. At this time, the raw material from the raw material input port is supplied to the middle part of the two upper electrodes, and the arcs from the two upper electrodes are mutually charged toward the center of the furnace body. Since it acts toward the raw material thus obtained, the dissolving efficiency of the raw material is improved.
- the raw material preheating charging device since the raw material preheating charging device is provided above the raw material charging port, the scrap raw material can be directly heated and charged by the high temperature exhaust gas from the furnace main body.
- the amount of heat input to the DC arc furnace can be reduced, and the operating cost can be reduced.
- FIG. 1 is a cut front view showing an example of a conventional DC arc furnace
- FIG. 2 is a cut side view of FIG. 1
- FIG. 3 is a conventional continuous charging type DC arc furnace.
- FIG. 4 is a cross-sectional view showing one example of a furnace
- FIG. 4 is a cut-away side view showing one embodiment of the present invention
- FIG. 5 is a view taken in the direction of arrows V-V in FIG.
- the figure is a view taken in the direction of arrows VI-VI in FIG. BEST MODE FOR CARRYING OUT THE INVENTION
- FIGS. 4 to 6 show one embodiment of the first and second aspects of the present invention.
- the same components as those in FIGS. 1 to 3 are denoted by the same reference numerals.
- a furnace cover 3 for closing the furnace body 2 is provided at an upper portion of a furnace body 2 having a bottom electrode 1 at a lower portion and an oblong planar shape, and a material input port 25 is formed at a substantially central position of the furnace cover 3. Further, two upper electrodes 26, 27 are provided so as to penetrate the furnace lid 3 at a position sandwiching the raw material inlet 25 in the longitudinal direction of the oval.
- the upper electrodes 26 and 27 are individually supported so as to be able to move up and down individually by an electrode lifting device 28, and the upper electrodes 26 and 27 are connected to a power source 30 via an upper conductor 29.
- the bottom electrode 1 is also connected to the power source 30 via a lower conductor 31 c.
- the furnace body 2 has a length centered on the two upper electrodes 26, 27. It has a circular shape, and is provided with a tapping port 32 that can be closed with a gun or the like on the minus side in the direction perpendicular to the longitudinal direction of the ellipse. Further, the furnace lid 3 is mounted on the upper part of the furnace main body 2 via a sealing device 33 so that the furnace lid 3 can be removed when the furnace main body 2 is maintained.
- a raw material preheating charging device 35 provided with a filling tank type heat exchange section 34 is disposed above the raw material input port 25, and a filling tank type heat exchange section 3 of the raw material preheating charging apparatus 35 is provided.
- a seal portion 36 such as a damper, and an exhaust device 37 provided with a heat exchanger, a dust collector, a suction fan, etc. is provided below the seal portion 36 to exhaust air.
- reference numeral 39 denotes a raw material supply device for supplying scrap raw material 15 to the upper part of a raw material preheating charging device 35 seal portion 36
- reference numeral 40 denotes a scrap preheated by a filling tank type heat exchange portion 34.
- Raw material 1 A raw material charging device for extruding 5 into the raw material inlet 2 5 and charging it almost continuously, and 41 is a furnace main body 2 which is tilted when the furnace main body 2 is tilted during maintenance of the furnace main body 2 or the like. It is a tilting device such as a cylinder for discharging all of the molten metal 11 and slag inside.
- the bottom electrode 1 and the upper electrode were placed in a state where the required amount of scrap material 15 was loaded into the furnace body 2 closed by the furnace lid 3.
- An electric current is applied between 26 and 27 to generate an arc 16 to melt the scrap material 15.
- the scrap raw material 15 is continuously charged at a constant rate from the raw material inlet '25.
- the scrap raw material 15 from the raw material inlet 25 comes to be charged into the middle part of the two upper electrodes 27 and 28, and accordingly, the temperature distribution in the furnace body 2 Are dissolved in a symmetrical state, so that the dissolution efficiency is improved without remaining undissolved.
- the arc 16 from each of the upper electrodes 26, 27 acts so as to face each other toward the center side where the scrubbing material 15 is charged, and thus the scrap continuously supplied.
- the raw material 15 can be more effectively dissolved.
- the arc 16 emitted from the other upper electrode 27 according to the framing left hand rule is Receives a force F from right to left, and similarly applies a force to the other upper electrode 27. Therefore, the arc 16 emitted by the upper electrode 26 crossing the magnetic field 24 also receives the force F from left to right as the direction of the magnetic field 24 is perpendicular to the plane of the paper and is from front to front. Therefore, the arcs 16 of the upper electrodes 26 and 27 are respectively directed toward the center, so that the scrap raw material 15 supplied toward the center can be effectively melted. it can.
- the upper electrodes (carbon electrodes) 26 and 27 are expensive and intensively consumed by oxidation, and it is required that the surface area of the electrodes be as small as possible.
- the minimum two upper electrodes 26 and 27 are provided so that 5 can be supplied, so that the consumption of the electrodes can be minimized.
- the tapping port 32 is opened by an opening device (not shown) to take out the molten metal 11.
- an opening device not shown
- the upper electrodes 26 and 27 are pulled out of the furnace cover 3 or the furnace cover 3 is removed, and then the furnace body 2 is tilted by the tilting device 41. To discharge all the molten metal 11 and slag at the bottom of the furnace body 2.
- the scrap material 1 is increased. Melting of 5 will be performed very efficiently in a short time and the temperature distribution in the furnace will be symmetrical, so the melting efficiency will be further promoted and the problem of wear of the furnace peripheral wall 23 can be reduced.
- a raw material preheating charging device 35 is provided at the raw material inlet 25 to directly heat the scrap raw material 15 with the high temperature exhaust gas from the furnace body 2 and continuously charge the furnace without opening the furnace lid 3. In combination with the improvement in the melting efficiency of the scrap material 15 and the reduction of the amount of heat input to the DC arc furnace to reduce the operating cost. Can be.
- the present invention is not limited to the above-described embodiment.
- the shape of the furnace body may be of various shapes such as an ellipse, an ellipse, and a rectangle.
- various changes can be made without departing from the spirit of the present invention.
- the scrap material is continuously charged from the material inlet formed between the two upper electrodes, and the arc is directed toward the scrap material at the center of the furnace body.
- the scrap material is continuously charged from the material inlet formed between the two upper electrodes, and the arc is directed toward the scrap material at the center of the furnace body.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- General Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
- Furnace Details (AREA)
- Gas Burners (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/335,696 US5479435A (en) | 1993-04-15 | 1994-04-14 | DC arc furnace |
DE1994614965 DE69414965T2 (de) | 1993-04-15 | 1994-04-14 | Gleichstromlichtbogenofen |
EP19940912674 EP0646757B1 (en) | 1993-04-15 | 1994-04-14 | Dc arc furnace |
KR1019940704242A KR0163971B1 (ko) | 1993-04-15 | 1994-04-14 | 직류 아크로 |
AU65127/94A AU664805B2 (en) | 1993-04-15 | 1994-04-14 | DC arc furnace |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8880393A JPH06300449A (ja) | 1993-04-15 | 1993-04-15 | 直流アーク炉 |
JP5/88803 | 1993-04-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1994024503A1 true WO1994024503A1 (en) | 1994-10-27 |
Family
ID=13953042
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1994/000617 WO1994024503A1 (en) | 1993-04-15 | 1994-04-14 | Dc arc furnace |
Country Status (11)
Country | Link |
---|---|
US (1) | US5479435A (ja) |
EP (1) | EP0646757B1 (ja) |
JP (1) | JPH06300449A (ja) |
KR (1) | KR0163971B1 (ja) |
CN (1) | CN1089428C (ja) |
AU (1) | AU664805B2 (ja) |
CA (1) | CA2135495C (ja) |
DE (1) | DE69414965T2 (ja) |
ES (1) | ES2126105T3 (ja) |
TW (1) | TW278126B (ja) |
WO (1) | WO1994024503A1 (ja) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3424259B2 (ja) * | 1993-04-15 | 2003-07-07 | 石川島播磨重工業株式会社 | 直流アーク炉 |
US6466605B1 (en) * | 2000-06-20 | 2002-10-15 | Electro-Pyrolysis, Inc. | Concentric electrode DC arc system and their use in processing waste materials |
WO1996030709A1 (fr) * | 1995-03-31 | 1996-10-03 | Nippon Steel Corporation | Procede et dispositif de prechauffage et de fusion de ferraille |
DE19846100C2 (de) * | 1998-10-07 | 2000-08-03 | Sms Demag Ag | Gleichstromlichtbogenofen zur Herstellung von Stahl sowie Verfahren hierzu |
US6155333A (en) * | 1999-02-23 | 2000-12-05 | Techint Compagnia Tecnica Internazionale | Continuous electric steelmaking with charge preheating, melting, refining and casting |
US7704443B2 (en) * | 2007-12-04 | 2010-04-27 | Alcoa, Inc. | Carbothermic aluminum production apparatus, systems and methods |
US8251746B2 (en) * | 2010-08-23 | 2012-08-28 | Hon Hai Precision Ind. Co., Ltd. | Shielded electrical connector |
KR101755948B1 (ko) * | 2015-12-21 | 2017-07-10 | 주식회사 포스코 | Dc전기로 |
CN107642997A (zh) * | 2017-09-30 | 2018-01-30 | 徐州中新机械科技有限公司 | 一种用于钢材冶炼的设备 |
CN111484045B (zh) * | 2020-04-23 | 2022-09-13 | 海城三岩矿业有限公司 | 一种电熔镁砂的多级重熔提纯方法 |
CN113390265A (zh) * | 2021-06-29 | 2021-09-14 | 上海电气上重铸锻有限公司 | 超高功率电弧炉水冷炉盖中心预制件及其材料 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5744916B2 (ja) * | 1975-04-28 | 1982-09-24 | ||
JPH03140791A (ja) * | 1989-10-27 | 1991-06-14 | Topy Ind Ltd | 直流アーク炉 |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4817403B1 (ja) * | 1968-10-03 | 1973-05-29 | ||
NO138462C (no) * | 1974-12-19 | 1980-04-23 | Elkem Spigerverket As | Anordning ved beskikning av elektriske smelteovner |
JPS5647505A (en) * | 1979-09-22 | 1981-04-30 | Nippon Tungsten Co Ltd | Mechanical sieal ring and preparation thereof |
SE452990B (sv) * | 1985-06-28 | 1988-01-04 | Asea Ab | Sett for framstellning av stal i en ljusbagsugn forsedd med elektrod med genomgaende kanal |
FR2611876B1 (fr) * | 1987-03-04 | 1989-08-04 | Clecim Sa | Four electrique a courant continu |
FI79560B (fi) * | 1988-02-22 | 1989-09-29 | Outokumpu Oy | Smaeltugn och foerfarande foer chargering av det material, som behandlas, in i den. |
JPH0224290A (ja) * | 1988-07-13 | 1990-01-26 | Nkk Corp | 低抵杭水中翼 |
JPH0749002B2 (ja) * | 1989-02-27 | 1995-05-31 | ワイケイケイ株式会社 | 模様付務歯列のスライドフアスナーの製造方法および装置 |
FI85912C (sv) * | 1990-04-11 | 1992-06-10 | Partek Ab | Förfarande och anordning för styrning av råmaterialtillförseln till en elektrisk smältugn |
FR2663723B1 (fr) * | 1990-06-20 | 1995-07-28 | Air Liquide | Procede et installation de fusion d'une charge en four. |
-
1993
- 1993-04-15 JP JP8880393A patent/JPH06300449A/ja active Pending
-
1994
- 1994-04-14 WO PCT/JP1994/000617 patent/WO1994024503A1/ja active IP Right Grant
- 1994-04-14 CN CN94190194A patent/CN1089428C/zh not_active Expired - Fee Related
- 1994-04-14 AU AU65127/94A patent/AU664805B2/en not_active Ceased
- 1994-04-14 CA CA 2135495 patent/CA2135495C/en not_active Expired - Fee Related
- 1994-04-14 DE DE1994614965 patent/DE69414965T2/de not_active Expired - Lifetime
- 1994-04-14 ES ES94912674T patent/ES2126105T3/es not_active Expired - Lifetime
- 1994-04-14 EP EP19940912674 patent/EP0646757B1/en not_active Expired - Lifetime
- 1994-04-14 KR KR1019940704242A patent/KR0163971B1/ko not_active IP Right Cessation
- 1994-04-14 US US08/335,696 patent/US5479435A/en not_active Expired - Lifetime
- 1994-07-18 TW TW83106532A patent/TW278126B/zh not_active IP Right Cessation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5744916B2 (ja) * | 1975-04-28 | 1982-09-24 | ||
JPH03140791A (ja) * | 1989-10-27 | 1991-06-14 | Topy Ind Ltd | 直流アーク炉 |
Non-Patent Citations (1)
Title |
---|
See also references of EP0646757A4 * |
Also Published As
Publication number | Publication date |
---|---|
JPH06300449A (ja) | 1994-10-28 |
ES2126105T3 (es) | 1999-03-16 |
KR950701726A (ko) | 1995-04-28 |
EP0646757A4 (en) | 1995-07-26 |
DE69414965D1 (de) | 1999-01-14 |
CN1089428C (zh) | 2002-08-21 |
CA2135495C (en) | 1999-02-23 |
EP0646757A1 (en) | 1995-04-05 |
TW278126B (ja) | 1996-06-11 |
CN1104836A (zh) | 1995-07-05 |
EP0646757B1 (en) | 1998-12-02 |
US5479435A (en) | 1995-12-26 |
DE69414965T2 (de) | 1999-04-22 |
KR0163971B1 (ko) | 1999-01-15 |
CA2135495A1 (en) | 1994-10-27 |
AU6512794A (en) | 1994-11-08 |
AU664805B2 (en) | 1995-11-30 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO1994024503A1 (en) | Dc arc furnace | |
JPH1030114A (ja) | アーク炉の運転法並びにアーク炉 | |
JPS6338536A (ja) | プラズマア−ク加熱方法および装置 | |
KR20010079989A (ko) | 중앙 장입 샤프트가 설치된 제강용 직류 아크 전기로 및이 직류 아크 전기로에 의해 제강하는 방법 | |
JP4446429B2 (ja) | 廃棄物処理用プラズマ溶融処理装置の運転方法 | |
JP3172781B2 (ja) | 直流電気炉 | |
JPH08136138A (ja) | 直流ア−ク炉 | |
JP4667665B2 (ja) | プラズマ式灰溶融炉およびその運転方法 | |
US4024337A (en) | DC arc furnace and starting electrode construction | |
JP2002090066A (ja) | スクラップ予熱型電気製鋼炉 | |
JP2873317B2 (ja) | 直流アーク炉 | |
JP3505065B2 (ja) | プラズマ溶融炉及びその運転方法 | |
JP3521277B2 (ja) | 冷鉄源の溶解方法及び溶解設備 | |
JP3568351B2 (ja) | プラズマ式溶融炉の再起動方法 | |
JP3108901B2 (ja) | 直流電気炉 | |
JPH06174375A (ja) | 2槽式アーク炉設備 | |
JP2002327211A (ja) | 冷鉄源の溶解方法 | |
JP3534444B2 (ja) | 溶融メタル出湯方法 | |
JPH01167577A (ja) | アーク溶解装置 | |
JP2000111270A (ja) | 冷鉄源の溶解方法 | |
JP2650670B2 (ja) | 空冷方式の炉底電極を有する直流電気炉 | |
JPH0961065A (ja) | スクラップ予熱装置付き直流アーク炉 | |
JPH0727481A (ja) | 2槽式アーク炉設備 | |
JP2000096126A (ja) | アーク炉による冷鉄原料の溶解方法 | |
JPH05223234A (ja) | ごみ焼却灰の溶融炉 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AU CA CN KR US |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LU MC NL PT SE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2135495 Country of ref document: CA |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1994912674 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 08335696 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1019940704242 Country of ref document: KR |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWP | Wipo information: published in national office |
Ref document number: 1994912674 Country of ref document: EP |
|
WWG | Wipo information: grant in national office |
Ref document number: 1994912674 Country of ref document: EP |