AU2004246333B2 - Direct current arc furnace - Google Patents
Direct current arc furnace Download PDFInfo
- Publication number
- AU2004246333B2 AU2004246333B2 AU2004246333A AU2004246333A AU2004246333B2 AU 2004246333 B2 AU2004246333 B2 AU 2004246333B2 AU 2004246333 A AU2004246333 A AU 2004246333A AU 2004246333 A AU2004246333 A AU 2004246333A AU 2004246333 B2 AU2004246333 B2 AU 2004246333B2
- Authority
- AU
- Australia
- Prior art keywords
- electrode
- furnace
- direct
- current arc
- holding ring
- 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
- 239000000725 suspension Substances 0.000 claims description 14
- 230000001105 regulatory effect Effects 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 4
- 239000002893 slag Substances 0.000 claims description 4
- 229910001021 Ferroalloy Inorganic materials 0.000 claims description 3
- YDZQQRWRVYGNER-UHFFFAOYSA-N iron;titanium;trihydrate Chemical compound O.O.O.[Ti].[Fe] YDZQQRWRVYGNER-UHFFFAOYSA-N 0.000 claims description 3
- 229910000604 Ferrochrome Inorganic materials 0.000 claims description 2
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 2
- 239000003638 chemical reducing agent Substances 0.000 claims description 2
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims 2
- 229910052719 titanium Inorganic materials 0.000 claims 2
- 239000010936 titanium Substances 0.000 claims 2
- 239000000049 pigment Substances 0.000 claims 1
- 238000007789 sealing Methods 0.000 abstract description 4
- 238000002485 combustion reaction Methods 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
Classifications
-
- 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
- H05B7/10—Mountings, supports, terminals or arrangements for feeding or guiding electrodes
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Metallurgy (AREA)
- Manufacturing & Machinery (AREA)
- Plasma & Fusion (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Organic Chemistry (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
- Furnace Details (AREA)
- Discharge Heating (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
Abstract
The invention relates to a direct current arc furnace (1) comprising an electrode (12) which is maintained inside the furnace and which can be replaced in order to compensate the combustion of the electrode. Said direct current arc furnace also comprises a counter electrode (10, 11) which is arranged in the furnace, for example, a base electrode. In order to prevent loss of power during replacement and/or attachment of the electrode in said type of furnace and in order to improve the sealing power of the electrode in the furnace cover, the whole electrode branch (14) is arranged with an electrode holder and a replacement device is arranged on a furnace platform (13) or a frame above the furnace (1).
Description
DIRECT-CURRENT ARC FURNACE The invention concerns a direct-current arc furnace with at least one electrode, which is held inside the furnace and can be advanced to compensate electrode consumption, and with a counter electrode in the furnace, for example, a bottom electrode, wherein the entire electrode train with an electrode holder and an advancing device is mounted as a suspension system on a furnace platform or a frame above the furnace.
Direct-current arc furnaces for melting steel scrap generally have at least one centrally arranged electrode and at least one bottom electrode to produce a flow of current through the steel bath. As is well known, the electrode, which projects into the furnace vessel from above, is held and guided by a support arm construction, which is arranged to the side of the furnace and extends with an L shape above the roof of the furnace. The electrode is guided vertically into the furnace by the support arm and is advanced inside the furnace to compensate consumption of the tip of the electrode. Since the furnace roof is swung away to charge the furnace, for example, with scrap, the electrode can also be moved out of the furnace by this support arm construction. A support arm construction of this type is described, for N:\Melboume\Cases\Palen\59000-59999\P59069.A Spes\P5969.AU Speafication 2009-1-21.doc 29101/09 example, in DE 36 40 298 Al and DE 195 26 161 C2.
SIn reduction furnaces, it is well known that the electrode train can be arranged above the furnace roof
(N
with an electrode mount, as is described, for example, in c 5 DE 43 42 511 Al, according to which the electrode \0 projecting into the furnace is held by a clamping ring of an advancing device, which is supported on a frame by a Ci lifting cylinder. An electrode mount is mounted on the frame, and an electrode holding ring, which likewise embraces the electrode, is arranged on the electrode mount. The frame is supported on a control and maintenance platform by a regulating cylinder. The electrode can also be moved back by the advancing device.
In the previously known support arm construction of direct-current arc furnaces, a large support arm travel distance is necessary to embrace the newly attached electrode length. Due to the vibrations produced by the direct-current operation, the support arm that holds and guides the electrode is also caused to vibrate. This vibrational motion of the support arm leads to uncontrolled movement of the electrode at the seal in the furnace roof. This results in wear and thus leakage.
Furthermore, the power supply to the furnace must be interrupted during advancing and attachment of the electrode. In addition, the furnace crane needs large 2 N:\Melboume\Cases\Patent\59000-59999\P59069.AU\Spes\P59069.AU Specificatbon 2009-1-21 doc 29/01/09 lifting power to hold the electrode during advancing and attachment.
In one embodiment, the invention avoids power loss during the advancing and attachment operation in a furnace operated with direct current and to improve the sealing of the electrode in the furnace roof, especially when the furnace is operated with a highly concentrated CO atmosphere.
In accordance with one aspect of the present invention, there is provided a direct-current arc furnace with at least one electrode, which is held inside the furnace and can be advanced to compensate electrode consumption, and with a counter electrode in the furnace, wherein the entire electrode train with an electrode holder and an advancing device is mounted as a suspension system on a furnace platform or a frame above the furnace, wherein the suspension system comprises an electrode guide frame, which is mounted on the furnace platform; electrode regulating cylinders, which extend along the axis of the electrode, are mounted on the cylinder side by suspension on the guide frame, and are connected on the furnace side with an electrode holding ring by their pistons, such that the holding ring operates with two pressure stages; and 3 N:\MelboumeNCases\Patent\59000-59999\P59069.AU\Specis\P59069.AU Speoficaon 2009-1-21.doc 29101/09 lifting cylinders, which are supported on this holding ring and by which a first electrode advancing ring can be moved along the electrode axis within the electrode regulating cylinders, such that to advance the electrode, the first electrode advancing ring is released and moved upward by means of the lifting cylinders, the first electrode advancing ring is then reclamped around the electrode and holds it, and then the electrode is advanced into the furnace by a stroke movement in the opposite direction.
Advantageous refinements of the invention are described in the dependent claims.
The basic idea of the invention is to use an alternating-current electrode train that is typical for a reduction furnace or a typical electrode body design in a direct-current arc furnace. The electrode train consists essentially of an electrode holder and an advancing device, which is mounted on a furnace platform or frame located above the furnace.
This electrode train makes it possible to advance the electrode and to move it back without having to interrupt the furnace power supply and without the use of heavy equipment, such as the furnace house crane. The same is true for the connection of a new electrode length. In addition, advancing and attachment are possible while 4 N:\Melboume\Cases\Patent\59000-59999\P59069.AU\SpecisP59069.AU Speafication 2009-1 -21.doc 2901/09 power is still being supplied to the furnace. This means a large yield of molten metal, because fewer scheduled furnace shutdowns and thus fewer process interruptions are necessary.
Vibrations of the electrode and undesired horizontal movements that occur in combination with a support arm mount are avoided by the electrode train that is used.
This results in better sealing of the electrode in the furnace roof, which is an advantage with respect to safe furnace operation, especially with a highly concentrated CO atmosphere.
Preferably, the electrode of the electrode train can also be designed as a hollow electrode, through which charge material, for example, fine charge material, can be conveyed into the furnace.
The invention is explained below with reference to the specific embodiment illustrated in the drawings.
Figure 1 shows a side view of a direct-current arc furnace of the invention in combination with an electrode train typically used for a reduction furnace.
Figure 2 shows detail of the suspension system of the electrode train of Figure i.
Figure 3 shows the sectional view A-A of Figure 2.
Figure 4 shows the sectional view B-B of Figure 3.
Figure 1 shows an arc furnace 1 that is operated with 5 N*\Melbume\Cses\Palet590 -S999 PS969.ALSp iP59069.AU Speaftation 2009-1-21.doc 29/01/09 direct current. It comprises essentially a furnace vessel 2 and a furnace roof 3 with a central roof section 4. The furnace vessel 2 is rigidly mounted by means of a frame construction 5 on columns 6. The furnace wall 7 is lined on the inside with refractory material 8. Two bottom electrodes 10, 11 are mounted in the furnace bottom. An electrode 12 extends into the inside of the furnace from above. It is not mounted on a support arm located next to the furnace, as is customary in conventional furnaces of this type, but rather on an electrode train 14, which is mounted on the furnace platform 13 and is designed as a suspension system in the embodiment illustrated here. The electrode train 14 is mounted on a guide frame 16, which is arranged above the furnace 1 along the furnace platform 13.
The direct-current arc furnace 1 with the electrode train 14 is preferably used for the production of slags that contain Ti02, for ferrochromium, ferromanganese, and other ferroalloys, and for nonferrous slag processes customarily carried out in a reduction furnace. For this purpose, charge material, for example, ilmenite in sand form, is charged into the furnace as the base product, specifically, through the electrode, which is designed as a hollow electrode. Ilmenite is mixed with reducing agents and melted. The pig iron formed during the 6 N:\Melboume\CaseslPatent\59000-59999\P59069.AU\Specis\P59069.AU Specification 2009-1-21 doc 29/01/09 reduction, which, together with the bottom electrodes, forms an extended anode, is then tapped through a side tap hole 17. The charge material is stored in vessels 18 above the furnace platform 13 and charged into the inside of the furnace through vertical or lateral charging lines 19a, b and through the hollow electrode 12.
The individual components of the electrode train are shown in detail in Figure 2. The guide frame 16 surrounds a guide roller 20 on the electrode side to avoid tilting during the advancing of the electrode 12. The suspension system 15 consists, first, of hydraulically operated electrode regulating cylinders 21, 22, which take on the suspension of the entire electrode train 14. These cylinders are mounted on the cylinder side by suspension on the guide frame 16 by connecting elements 23, 24 and extend along the longitudinal axis of the electrode. The connecting elements 23, 24 are anchored in the guide frame 16. The ends 25, 26 of their pistons are rigidly connected with a holding ring 27 for the electrode 12.
Two hydraulic lifting cylinders 28, 29 that can be operated at both ends are mounted on the side of this holding ring 27 that faces away from the furnace. A first or upper advancing ring 30 can be hydraulically moved along the longitudinal axis of the electrode by these lifting cylinders 28, 29. The oil lines are numbered 31 7 N:\Melboume\Cases\Patent\59000-59999\P59069.AU\Specs\P59G69AU Specificalion 2009-1.21.doc 29/01/09 and 32. Current is conducted to the electrode 12 through the holding ring 27. To this end, a power supply line 33 is guided to the holding ring 27 first through a rigid line and then a flexible line. Two power supply lines 33a, b can also be provided, as shown in the detail drawing of Figure 2.
The manner of operation of the lower holding ring 27 is apparent from the detail drawings of Figures 3 and 4.
The lower holding ring 27, which simultaneously serves as a second advancing ring, surrounds a power supply jaw 34 and two clamping jaws 35, 36, which can be pressed with varying intensity on the circumferential surface of the electrode. To this end, the holding ring 27 is provided with a hydraulic contact pressure element 37. In a first pressure stage, the clamping jaws 35, 36 come to rest against the surface of the electrode, so that an effective flow of current from the power supply lines is possible.
In this pressure stage, however, the electrode can be pushed through the holding ring 27. In a second pressure stage, the clamping jaws 35, 36 clamp tightly around the surface of the electrode by means of the expanding contact pressure element 37, so that the holding ring 27 can hold the electrode by itself.
The manner in which an advancing operation is carried out in the direct-current arc furnace of the invention 8 N:\Melboume\Cases\Patent\59000-59999\P59069AU\Specs\P59069.AU Specification 2009-1-21.doc 29/01/09 will now be explained. The electrode 12 is guided into the interior of the furnace and held by means of the suspension system 15. The electrode 12 extends into the furnace 1 through the guide frame 16 and through the central section 4 of the roof. Figure 2 shows that the opening in the furnace roof is sealed from the circumferential surface of the electrode with a seal 38.
Initially, the electrode is held by the upper advancing ring 30. When the electrode 12 is then to be advanced, this advancing ring 30 is released and moved upward by the advancing stroke distance x in the direction of the guide frame 16 by extension of the double-acting lifting cylinders 28, 29. In this way, the distance between the holding ring 27 and the advancing ring 30 is increased.
The advancing ring 30 in its displaced position is then clamped to the electrode 12 again. The holding ring 27 is placed in the first pressure stage by releasing the contact pressure element 37. While current can continue to flow, the electrode can be pushed farther into the furnace through the released holding ring 27 by moving the lifting cylinders 28, 29 back and reducing the distance between the advancing ring 30 and the holding ring 27.
During this operation, the electrode 12 slides vertically along the guide rollers 20 of the guide frame 16 and the seal 38 of the opening in the furnace roof. When the 9 N,\Melboume\Cases\Palt 0-59999P59069.AU\SpecPS969AU Spedficaon 2009-1-21 .doc 29/01/09 advancing operation has been completed, the holding ring 27 is again pressed against the electrode 12 with increased contact pressure.
All together, the replacement of a support arm construction by an electrode train supported above the furnace has been found to be very advantageous for a direct-current arc furnace. By making it possible to advance the electrode without shutting down the furnace, the total yield is increased. Compared to the previous system, this system operates more smoothly and thus more effectively and economically. The elimination of vibrations reduces wear in guide locations and sealing locations, especially in the furnace roof. Due to the better and longer-lasting seals, safety is improved in processes in which CO is produced.
List of Reference Numbers 1 direct-current arc furnace 2 furnace vessel 3 furnace roof 4 central section of roof frame construction 6 columns 7 furnace wall N:\Melbome\Cases\Patent\59 000-S9999\PS9069 AUkSpecis\P59O69AU Speaficatron 2009-1-21.doc 29/01/09 8 refractory material 9 furnace bottom bottom electrode 11 bottom electrode 12 electrode 13 furnace platform 14 electrode train suspension system 16 guide frame 17 tap hole 18 vessel 19 vertical charging line or lateral charging line guide roller 21 electrode regulating cylinder 22 electrode regulating cylinder 23 connecting element 24 connecting element piston end 26 piston end 27 electrode holding ring or lower advancing ring 28 lifting cylinder 29 lifting cylinder first or upper advancing ring 31 oil line 32 oil line 11 N:\Melboume\CasesPaent59000-59999\P59069.AU\Spes\P59069 AU Specification 2009-1-21 doc 29/01/09 33 power supply line (33a and b) 34 power supply jaw clamping jaw 36 clamping jaw 37 contact pressure element 38 seal In the claims which follow and in the preceding description of the invention, except where the context requires otherwise due to express language or necessary implication, the word "comprise" or variations such as "comprises" or "comprising" is used in an inclusive sense, i.e. to specify the presence of the stated features but not to preclude the presence or addition of further features in various embodiments of the invention.
It is to be understood that, if any prior art publication is referred to herein, such reference does not constitute an admission that the publication forms a part of the common general knowledge in the art, in Australia or any other country.
12 N:\Melboume\Cases\Palent\59000-59999\P59069AU\Specis\P59069AU Spefication 20091-21.doc 29101/09
Claims (9)
1. Direct-current arc furnace with at least one electrode, which is held inside the furnace and can be advanced to compensate electrode consumption, and with a counter electrode in the furnace, wherein the entire electrode train with an electrode holder and an advancing device is mounted as a suspension system on a furnace platform or a frame above the furnace, wherein the suspension system comprises an electrode guide frame, which is mounted on the furnace platform; electrode regulating cylinders, which extend along the axis of the electrode, are mounted on the cylinder side by suspension on the guide frame, and are connected on the furnace side with an electrode holding ring by their pistons, such that the holding ring operates with two pressure stages; and lifting cylinders, which are supported on this holding ring and by which a first electrode advancing ring can be moved along the electrode axis within the electrode regulating cylinders, such that to advance the electrode, the first electrode advancing ring is released and moved upward by means of the lifting cylinders, the first 13 N:\Melboume\Cases\Patent\59000-59999\P5969.AU\SpecisP59069.AU Specification 2009-1-21 .doc 29/01/09 electrode advancing ring is then reclamped around the electrode and holds it, and then the electrode is advanced into the furnace by a stroke movement in the opposite direction.
2. Direct-current arc furnace in accordance with Claim 1, wherein the holding ring is connected with a power supply line and thus conducts current into the electrode, and that a hydraulic contact pressure element, which operates with two pressure stages, is integrated in the holding ring, such that in the first pressure stage, the holding ring is in contact with the electrode in such a way that current flows into the electrode, and the electrode is advanced into the furnace through the holding ring, and such that in the second pressure stage, the electrode is held by the holding ring as a second advancing ring, while the first advancing ring is opened.
3. Direct-current arc furnace in accordance with Claim 1 or 2, wherein the electrode is a hollow electrode, through which charge material is charged to the furnace.
4. Use of a direct-current arc furnace in accordance with any of Claims 1 to 3 for producing slag that contains Ti0 2 for further processing for the pigment industry, such that a titanium-containing ore is charged to the furnace as the base product, mixed with reducing agents, and melted and reduced by the energy of the electrodes. 14 N:\Melboume\Cases\Patenl\59000-59999\P59069 AU\Speos\P59069 AU Specification 2009-1-21.doc 29/01/09
5. Use of a direct-current arc furnace in accordance (N D with any of Claims 1 to 3 for producing ferroalloys, or for nonferrous slag processes. 00 M 5
6. A direct-current arc furnace in accordance with 0 Claim 1, wherein the counter electrode in the furnace is a ,1- bottom electrode.
7. Use of a direct-current arc furnace in accordance with Claim 4, wherein the titanium-containing ore includes ilmenite in sand form.
8. Use of a direct-current arc furnace in accordance with Claim 4, wherein the ferroalloys include ferrochromium and ferromanganese.
9. A direct-current arc furnace in accordance with any of the Claims 1 to 8, and having one or more features not previously claimed and substantially as herein described with reference to the accompanying drawings. N:\Melboume\Cases\Patent\S9000-59999\P59069.AU\Spes\PS9069.AU Specification 2009-1-21.doc 18/02109
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10325169A DE10325169A1 (en) | 2003-06-04 | 2003-06-04 | DC arc furnace |
| DE10325169.3 | 2003-06-04 | ||
| PCT/EP2004/005122 WO2004110104A1 (en) | 2003-06-04 | 2004-05-13 | Direct current arc furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU2004246333A1 AU2004246333A1 (en) | 2004-12-16 |
| AU2004246333B2 true AU2004246333B2 (en) | 2009-03-26 |
Family
ID=33482470
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2004246333A Ceased AU2004246333B2 (en) | 2003-06-04 | 2004-05-13 | Direct current arc furnace |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP1629699B1 (en) |
| CN (1) | CN1830230B (en) |
| AT (1) | ATE346478T1 (en) |
| AU (1) | AU2004246333B2 (en) |
| CA (1) | CA2528055C (en) |
| DE (2) | DE10325169A1 (en) |
| NO (1) | NO335398B1 (en) |
| WO (1) | WO2004110104A1 (en) |
| ZA (1) | ZA200509782B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006000737A1 (en) * | 2006-01-04 | 2007-07-05 | Sms Demag Ag | Device for adjusting an electrode in a metallurgical furnace comprises a clamping ring and a holding ring mounted in the furnace roof |
| CN102829637A (en) * | 2012-08-14 | 2012-12-19 | 沈林彬 | Moveable spiral conveying electrode for adding powder to center of electric furnace |
| WO2016044862A1 (en) * | 2014-04-28 | 2016-03-24 | Vernon Harding | Dc arc furnace synthesis of refined ferromanganese alloys and metal |
| CN110436390B (en) * | 2019-08-16 | 2020-12-15 | 重庆市赛特刚玉有限公司 | Electrode barrel lifting device for dumping furnace |
| CN115820964A (en) * | 2022-12-08 | 2023-03-21 | 徐州宏阳新材料科技股份有限公司 | Device and method for preparing high-carbon ferrochrome through whole-powder ore smelting |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3057935A (en) * | 1957-11-22 | 1962-10-09 | Republic Steel Corp | Supporting and current supplying means for consumable electrodes in electric furnaces |
| US3819841A (en) * | 1973-08-06 | 1974-06-25 | Pennsylvania Engineering Corp | Iron-free self-braking electrode |
| US4543656A (en) * | 1982-12-03 | 1985-09-24 | Elkem A/S | Electrode holder system for electrothermic smelting furnaces |
| US5146469A (en) * | 1989-11-14 | 1992-09-08 | Elkem Technology A/S | Method and means for continuous production of carbon bodies |
| US5757841A (en) * | 1992-03-06 | 1998-05-26 | Daido Tokushuko Kabushiki Kaisha | Method and apparatus for joining new electrode to consumed electrode of electric furnace |
| US5956366A (en) * | 1997-02-26 | 1999-09-21 | Nkk Steel Engineering, Inc. | Arc furnace and method in which molten material is stirred and the arc is guided |
| US6330270B1 (en) * | 1998-03-31 | 2001-12-11 | Elkem Asa | Method for weighing electrodes in electric smelting furnaces |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3589434A (en) * | 1967-11-06 | 1971-06-29 | Otmar Kleinhagauer | Installations for electrically remelting metals |
-
2003
- 2003-06-04 DE DE10325169A patent/DE10325169A1/en not_active Withdrawn
-
2004
- 2004-05-13 AT AT04732593T patent/ATE346478T1/en not_active IP Right Cessation
- 2004-05-13 CA CA2528055A patent/CA2528055C/en not_active Expired - Lifetime
- 2004-05-13 DE DE502004002101T patent/DE502004002101D1/en not_active Expired - Lifetime
- 2004-05-13 WO PCT/EP2004/005122 patent/WO2004110104A1/en active IP Right Grant
- 2004-05-13 CN CN2004800214081A patent/CN1830230B/en not_active Expired - Lifetime
- 2004-05-13 AU AU2004246333A patent/AU2004246333B2/en not_active Ceased
- 2004-05-13 EP EP04732593A patent/EP1629699B1/en not_active Expired - Lifetime
-
2005
- 2005-11-25 NO NO20055577A patent/NO335398B1/en unknown
- 2005-12-02 ZA ZA200509782A patent/ZA200509782B/en unknown
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3057935A (en) * | 1957-11-22 | 1962-10-09 | Republic Steel Corp | Supporting and current supplying means for consumable electrodes in electric furnaces |
| US3819841A (en) * | 1973-08-06 | 1974-06-25 | Pennsylvania Engineering Corp | Iron-free self-braking electrode |
| US4543656A (en) * | 1982-12-03 | 1985-09-24 | Elkem A/S | Electrode holder system for electrothermic smelting furnaces |
| US5146469A (en) * | 1989-11-14 | 1992-09-08 | Elkem Technology A/S | Method and means for continuous production of carbon bodies |
| US5757841A (en) * | 1992-03-06 | 1998-05-26 | Daido Tokushuko Kabushiki Kaisha | Method and apparatus for joining new electrode to consumed electrode of electric furnace |
| US5956366A (en) * | 1997-02-26 | 1999-09-21 | Nkk Steel Engineering, Inc. | Arc furnace and method in which molten material is stirred and the arc is guided |
| US6330270B1 (en) * | 1998-03-31 | 2001-12-11 | Elkem Asa | Method for weighing electrodes in electric smelting furnaces |
Also Published As
| Publication number | Publication date |
|---|---|
| DE10325169A1 (en) | 2004-12-23 |
| CA2528055A1 (en) | 2004-12-16 |
| EP1629699B1 (en) | 2006-11-22 |
| ATE346478T1 (en) | 2006-12-15 |
| CN1830230A (en) | 2006-09-06 |
| EP1629699A1 (en) | 2006-03-01 |
| NO20055577L (en) | 2006-01-03 |
| CN1830230B (en) | 2010-08-18 |
| NO335398B1 (en) | 2014-12-08 |
| ZA200509782B (en) | 2006-09-27 |
| CA2528055C (en) | 2012-10-16 |
| DE502004002101D1 (en) | 2007-01-04 |
| WO2004110104A1 (en) | 2004-12-16 |
| NO20055577D0 (en) | 2005-11-25 |
| AU2004246333A1 (en) | 2004-12-16 |
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