ZA200509782B - Direct current arc furnace - Google Patents
Direct current arc furnace Download PDFInfo
- Publication number
- ZA200509782B ZA200509782B ZA200509782A ZA200509782A ZA200509782B ZA 200509782 B ZA200509782 B ZA 200509782B ZA 200509782 A ZA200509782 A ZA 200509782A ZA 200509782 A ZA200509782 A ZA 200509782A ZA 200509782 B ZA200509782 B ZA 200509782B
- Authority
- ZA
- South Africa
- Prior art keywords
- electrode
- furnace
- current arc
- direct
- holding ring
- Prior art date
Links
- 239000000725 suspension Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 2
- 239000002893 slag Substances 0.000 claims 2
- 229910001021 Ferroalloy Inorganic materials 0.000 claims 1
- 229910000604 Ferrochrome Inorganic materials 0.000 claims 1
- 229910000616 Ferromanganese Inorganic materials 0.000 claims 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims 1
- 239000003638 chemical reducing agent Substances 0.000 claims 1
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims 1
- YDZQQRWRVYGNER-UHFFFAOYSA-N iron;titanium;trihydrate Chemical compound O.O.O.[Ti].[Fe] YDZQQRWRVYGNER-UHFFFAOYSA-N 0.000 claims 1
- 239000000049 pigment Substances 0.000 claims 1
- 229910052719 titanium Inorganic materials 0.000 claims 1
- 239000010936 titanium Substances 0.000 claims 1
- 238000007789 sealing Methods 0.000 abstract description 3
- 238000002485 combustion reaction Methods 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000001419 dependent effect Effects 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
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
TRANSLATION (HM-684 -- amended pages):
October 5, 2004
PCT/EP2004/005,122
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 example, in DE 36 40 298 Al and DE 195 26 161 C2.
In reduction furnaces, it is well known that the electrode train can be arranged above the furnace roof with an electrode mount, as is described, for example, in DE 43 42 511 Al, according to which the electrode projecting into the furnace is held by a clamping ring of an advancing device, which is supported on a frame by a 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 lifting power to hold the electrode during advancing and attachment.
Proceeding on the basis of this prior art, the objective of the invention is to avoid 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.
This objective is achieved by a furnace with the features of Claim 1. 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 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.
Claims (5)
1. Direct-current arc furnace (1) with at least one electrode (12), which is held inside the furnace and can be advanced to compensate electrode consumption, and with a counter electrode (10, 11) in the furnace, for example, a bottom electrode, wherein the entire electrode train (14) with an electrode holder and an advancing device is mounted as a suspension system (15) on a furnace platform (13) or a frame above the furnace (1), characterized by the fact that the suspension system (15) comprises -- an electrode (12) guide frame (16), which is mounted on the furnace platform (13), -- electrode regulating cylinders (21, 22), which extend along the axis of the electrode, are mounted on the cylinder side by suspension on the guide frame (16), and are connected on the furnace side with an electrode holding ring (27) by their pistons (25, 26), such that the holding ring (27) operates with two pressure stages, and
-- lifting cylinders (28, 29), which are supported on this holding ring (27) and by which a first electrode advancing ring (30) can be moved along the electrode axis within the electrode regulating cylinders (21, 22), such that to advance the electrode (12), the first electrode advancing ring (30) is released and moved upward by means of the lifting cylinders (28, 29), the first electrode advancing ring (30) is then reclamped around the electrode (12) and holds it, and then the electrode (12) is advanced into the furnace by a stroke movement in the opposite direction.
2. Direct-current arc furnace in accordance with Claim 1, characterized by the fact that the holding ring (27) is connected with a power supply line (33) and thus conducts current into the electrode, and that a hydraulic contact pressure element (37), which operates with two pressure stages, is integrated in the holding ring (27), such that in the first pressure stage, the holding ring (27) is in contact with the electrode in such a way that current flows into the electrode, and the electrode (12) is advanced into the furnace through the holding ring (27), and such that in the second pressure stage, the electrode (12) is Held by the holding ring (27) as a second advancing ring, while the first advancing ring (30) is opened.
3. Direct-current arc furnace in accordance with Claim 1 or 2, characterized by the fact that the electrode (12) is a hollow electrode, through which charge material is charged to the furnace (1).
4. Use of a direct-current arc furnace (1) in accordance with any of Claims 1 to 3 for producing slag that contains TiO, for further processing for the pigment industry, such that a titanium-containing ore, such as ilmenite in sand form, is charged to the furnace as the base product, mixed with reducing agents, and melted and reduced by the energy of the electrodes.
5. Use of a direct-current arc furnace (1) in accordance with any of Claims 1 to 3 for producing ferroalloys, such as ferrochromium and ferromanganese, or for nonferrous slag processes.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10325169A DE10325169A1 (en) | 2003-06-04 | 2003-06-04 | DC arc furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| ZA200509782B true ZA200509782B (en) | 2006-09-27 |
Family
ID=33482470
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ZA200509782A ZA200509782B (en) | 2003-06-04 | 2005-12-02 | 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 |
| EP3137636A1 (en) * | 2014-04-28 | 2017-03-08 | 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 |
Family Cites Families (8)
| 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 |
| US3589434A (en) * | 1967-11-06 | 1971-06-29 | Otmar Kleinhagauer | Installations for electrically remelting metals |
| US3819841A (en) * | 1973-08-06 | 1974-06-25 | Pennsylvania Engineering Corp | Iron-free self-braking electrode |
| NO151105C (en) * | 1982-12-03 | 1985-02-06 | Elkem As | LEAD HOLDER SYSTEM |
| IT1243899B (en) * | 1989-11-14 | 1994-06-28 | Elkem Technology | PROCEDURE AND MEANS FOR THE CONTINUOUS PRODUCTION OF COAL BODIES. |
| TW210357B (en) * | 1992-03-06 | 1993-08-01 | Daido Steel Co Ltd | |
| 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 |
| NO306439B1 (en) * | 1998-03-31 | 1999-11-01 | Elkem Materials | Weighing of consumable electrodes in electric furnaces |
-
2003
- 2003-06-04 DE DE10325169A patent/DE10325169A1/en not_active Withdrawn
-
2004
- 2004-05-13 EP EP04732593A patent/EP1629699B1/en not_active Expired - Lifetime
- 2004-05-13 CA CA2528055A patent/CA2528055C/en not_active Expired - Lifetime
- 2004-05-13 AT AT04732593T patent/ATE346478T1/en not_active IP Right Cessation
- 2004-05-13 AU AU2004246333A patent/AU2004246333B2/en not_active Ceased
- 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 DE DE502004002101T patent/DE502004002101D1/en not_active Expired - Lifetime
-
2005
- 2005-11-25 NO NO20055577A patent/NO335398B1/en unknown
- 2005-12-02 ZA ZA200509782A patent/ZA200509782B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| NO20055577L (en) | 2006-01-03 |
| WO2004110104A1 (en) | 2004-12-16 |
| CN1830230B (en) | 2010-08-18 |
| CA2528055C (en) | 2012-10-16 |
| AU2004246333A1 (en) | 2004-12-16 |
| DE10325169A1 (en) | 2004-12-23 |
| ATE346478T1 (en) | 2006-12-15 |
| CA2528055A1 (en) | 2004-12-16 |
| NO20055577D0 (en) | 2005-11-25 |
| NO335398B1 (en) | 2014-12-08 |
| EP1629699B1 (en) | 2006-11-22 |
| EP1629699A1 (en) | 2006-03-01 |
| CN1830230A (en) | 2006-09-06 |
| DE502004002101D1 (en) | 2007-01-04 |
| AU2004246333B2 (en) | 2009-03-26 |
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