WO2005022060A2 - Electrode arrangement as substitute bottom for an electrothermic slag smelting furnace - Google Patents

Electrode arrangement as substitute bottom for an electrothermic slag smelting furnace Download PDF

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Publication number
WO2005022060A2
WO2005022060A2 PCT/US2004/026858 US2004026858W WO2005022060A2 WO 2005022060 A2 WO2005022060 A2 WO 2005022060A2 US 2004026858 W US2004026858 W US 2004026858W WO 2005022060 A2 WO2005022060 A2 WO 2005022060A2
Authority
WO
WIPO (PCT)
Prior art keywords
side wall
furnace
contacts
electrode arrangement
slag
Prior art date
Application number
PCT/US2004/026858
Other languages
French (fr)
Other versions
WO2005022060A3 (en
Inventor
Jan Arthur Aune
Jon Christian Brinch
Kai Johansen
Original Assignee
Alcoa Inc.
Elkem As
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Alcoa Inc., Elkem As filed Critical Alcoa Inc.
Priority to CA002536617A priority Critical patent/CA2536617A1/en
Priority to AU2004268194A priority patent/AU2004268194A1/en
Priority to BRPI0413036-7A priority patent/BRPI0413036A/en
Priority to EP04781525A priority patent/EP1671072A2/en
Publication of WO2005022060A2 publication Critical patent/WO2005022060A2/en
Publication of WO2005022060A3 publication Critical patent/WO2005022060A3/en
Priority to NO20055644A priority patent/NO20055644L/en

Links

Classifications

    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B21/00—Obtaining aluminium
    • C22B21/02—Obtaining aluminium with reducing
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B4/00—Electrothermal treatment of ores or metallurgical products for obtaining metals or alloys
    • C22B4/08—Apparatus
    • 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
    • F27B3/085—Arc furnaces
    • 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
    • H05B7/144—Power supplies specially adapted for heating by electric discharge; Automatic control of power, e.g. by positioning of electrodes
    • H05B7/148—Automatic control of power
    • 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
    • Y02P10/25—Process efficiency

Definitions

  • the present invention relates to an electrode arrangement for an electrothermic slag-smelting furnace and, more particularly, to a furnace used for producing aluminum by a carbothermic method.
  • Background of the Invention [0002]
  • electrodes are oriented vertically and pass through the top of the furnace and penetrate into the molten slag. The electrodes are provided with alternating electric current to heat the slag by resistance heating. Normally, three vertical electrodes are used in electrothermic slag smelting furnaces. In order to allow current to flow through the slag, the bottom lining of the furnace is electrically conductive and constitutes a zero point for the current.
  • a principal object of the present invention is to provide an improved electrode arrangement for use in electrothermic slag smelting furnaces which eliminates a number of the problems in the prior art.
  • the present invention can be defined as an electrode arrangement for electric slag smelting furnaces having vertical electrodes which are supplied with electric current and are intended to be submerged into the liquid slag bath, said arrangement being characterized in that the furnace has one or more side wall contacts where the side wall contacts extend through the side wall of the furnace into the furnace interior. When there are more than one side wall contacts, the side wall contacts are all connected electrically to each other.
  • each of the side wall contacts The purpose for electrically interconnecting each of the side wall contacts is to make each of the side wall contacts at the same zero point for the current. [0007] It is preferred that where there are more than one side wall contact, all of the side wall contacts are equally spaced around the circumference of the furnace. More preferably, there are at least three side wall contacts which are equally spaced around a circumference of the furnace. [0008] Preferably, the side wall contacts are carbon bodies which are consumed in the furnace during operation and which are replaceable from outside the furnace. Preferably, there are openings in the side wall of the furnace to allow the side wall contacts to pass into the furnace. Each of the openings is equipped with a sealing means for maintaining a gas tight and liquid tight seal between the side wall and the side wall contact.
  • the sealing means allows for radial movement of the contact into the furnace interior in order to compensate for the wear or consumption of the side wall contacts. It is also preferred that the furnace is equipped with a moving means for radially moving each of the side wall contacts into the furnace in order to compensate for the wear on the side wall contacts. Preferably, each of the side wall contacts is equipped with a moving means and each of the side wall contacts can be moved independent of the other side wall contacts to provide for individual adjustment of the side wall contacts in the furnace. [0009]
  • the sealing means is also electrically insulated from the side wall.
  • one or more of the side wall contacts is hollow and is equipped with a means for feeding charge or slag forming components through the hollow contact while preventing flow of slag through the hole in the contact.
  • the side wall contacts are electrically interconnected and constitute a zero point for the current in the furnace. Wear on the side wall contacts can be compensated for by moving the side wall contacts radially inward from time to time.
  • the furnace bottom lining does not need to be electrically conductive and the furnace lining can therefore be designed to withstand the liquid slag and the high temperatures which exist in the furnace.
  • the material that is used to make up the furnace bottom lining can be solely based on its ability to withstand high temperatures and liquid slag.
  • the present invention makes possible to use the material for the bottom lining onto which a bottom layer of frozen slag has formed.
  • the formation of frozen slag on the bottom lining can be accomplished by using a good thermally conductive material and subjecting the bottom to external cooling.
  • the use of an electrically non-conductive bottom lining means that the bottom lining need not be electrically insulated from the rest of the furnace.
  • the furnace of the present invention is equipped with a tap hole which is placed in the side wall of the furnace at a level below the side wall contacts.
  • FIG. 1 shows a vertical sectional view through a slag smelting furnace equipped with the side wall contacts according to the present invention
  • FIG. 2 shows a horizontal view taken along A-A of FIG. 1
  • FIG. 3 shows a horizontal view of the furnace of the present invention similar to the one shown in FIG 2 except one of the side wall contacts is hollow.
  • smelting furnace 1 has a furnace pot with side wall 2 and bottom or bottom lining 3.
  • the bottom lining 3 preferably comprises an electrically insulating refractory material.
  • Furnace 1 is equipped with three conventional vertical carbon electrodes 4. Electrodes 4 are equipped with holding and slipping means 5 to allow for vertical movement of the electrodes and current clamps 6 to provide electric current to electrodes 4 from a power source (not shown) in a conventional manner.
  • Four horizontal side wall contacts 7 pass through openings 8 in side wall 2 of furnace 1 such that side wall contacts 7 extend into the interior 17 of furnace 1.
  • Side wall contacts 7 are electrically interconnected by electrical conductor 9.
  • Side wall contacts and their electrical conductor 9 are grounded so as to provide a zero point for the current, but are not connected to the power source.
  • Each of side wall contacts 7 has a sealing means 10 which prevents liquid slag from escaping through openings 8. Sealing means 10 also electrically insulates side wall contacts 7 from side wall 2 and allows for horizontal movement of side wall contacts 7 into furnace 1. Such sealing means are conventional and are typically employed for electrodes which are used in the side walls of furnaces.
  • Tap hole 11 is positioned in the side wall 2 of furnace 1 to allow molten slag to be removed from furnace 1 to a level below the height of side wall contacts 7. This tap hole is conventional and is operated in a conventional manner.
  • moving means 12 is employed with each side wall contact 7. Moving means 12 moves contact 7 into the furnace.
  • Moving means 12 is conventional and can be operated in a conventional manner.
  • Side wall contacts 7 are preferably conventional carbon bodies which are used in the smelting industry to conduct electricity in a smelting furnace. As side wall contacts 7 are worn down inside furnace 1, moving means 12 moves contacts 7 into furnace 1. Additional carbon bodies 7 A as shown in FIG. 1 are attached to the end of side wall contact 7 which extends outside the furnace so as to provide a continuous feed of side wall contacts 7 into the furnace. Such carbon bodies are conventional as is the means to connect multiple carbon bodies to each other.
  • One or more side wall contacts 7 may be hollow.
  • FIG. 3 is similar to FIG. 2 except for the fact that contact 13 is hollow and has means 14 for feeding slag forming components to furnace 1 through opening 15. The use of hollow side wall contact 13 allows for charge or slag forming materials to be fed to furnace 1.
  • the use of opening 15 in side wall 2 of furnace 1 to feed charge to furnace 1 is operated in a conventional manner using conventional equipment.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Metallurgy (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Plasma & Fusion (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Electrolytic Production Of Metals (AREA)
  • Gasification And Melting Of Waste (AREA)
  • Furnace Details (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

The electrode arrangement uses vertically oriented electrodes (4) with side wall contacts (7) for an electrothermic smelting furnace (1) for aluminum production. The side wall contacts (7) are radially moveable into the furnace (1) to compensate for wear on the contacts. The side wall contacts (7) can be hollow to allow a slag forming charge to be fed to the furnace (1). The arrengements of contacts at the side wall increases the life of the bottom lining.

Description

ELECTRODE ARRANGEMENT AS SUBSTITUTE BOTTOM FOR AN ELECTROTHERMIC SLAG SMELTING FURNACE
Field of the Invention [0001] The present invention relates to an electrode arrangement for an electrothermic slag-smelting furnace and, more particularly, to a furnace used for producing aluminum by a carbothermic method. Background of the Invention [0002] In electrothermic slag smelting furnaces, electrodes are oriented vertically and pass through the top of the furnace and penetrate into the molten slag. The electrodes are provided with alternating electric current to heat the slag by resistance heating. Normally, three vertical electrodes are used in electrothermic slag smelting furnaces. In order to allow current to flow through the slag, the bottom lining of the furnace is electrically conductive and constitutes a zero point for the current. One example of such a furnace is disclosed in U.S. Patent No. 6,440,193. This patent relates to a process and reactor for the carbothermic production of aluminum wherein a molten slag bath of alumina (Al2O3) and aluminum carbide (A14C3) is produced in separate compartments. [0003] It has been found that the use of the electrically conductive bottom lining in electrothermic smelting furnaces has a number of disadvantages. One of the disadvantages of the conductive bottom is that, because of the high wear on the bottom lining, the life of the bottom lining is reduced and repairs or replacements to the bottom lining are frequent. The high wear on the bottom lining is due to the high temperature to which the bottom lining is subjected because the bottom lining is the zero point for the current that flows through the slag of the furnace. Another major disadvantage to the conductive bottom lining is that when the furnace is shut down, restarting of the furnace is difficult due to the solidification or freeze-up of slag in the furnace during the shutdown. Accordingly, there remains a need for an electrothermic-smelting furnace having an electrode arrangement substituting for the bottom lining as an electrical contact. Summary of the Invention [0004] A principal object of the present invention is to provide an improved electrode arrangement for use in electrothermic slag smelting furnaces which eliminates a number of the problems in the prior art. [0005] It has been discovered that one or more contacts located in the side wall of the furnace can act as a zero point for the current in the furnace, thereby substituting for the bottom lining of the furnace as an electrical contact. Using side wall contacts provides a number of advantages over using the bottom of the furnace as the contact surface. [0006] Broadly, the present invention can be defined as an electrode arrangement for electric slag smelting furnaces having vertical electrodes which are supplied with electric current and are intended to be submerged into the liquid slag bath, said arrangement being characterized in that the furnace has one or more side wall contacts where the side wall contacts extend through the side wall of the furnace into the furnace interior. When there are more than one side wall contacts, the side wall contacts are all connected electrically to each other. The purpose for electrically interconnecting each of the side wall contacts is to make each of the side wall contacts at the same zero point for the current. [0007] It is preferred that where there are more than one side wall contact, all of the side wall contacts are equally spaced around the circumference of the furnace. More preferably, there are at least three side wall contacts which are equally spaced around a circumference of the furnace. [0008] Preferably, the side wall contacts are carbon bodies which are consumed in the furnace during operation and which are replaceable from outside the furnace. Preferably, there are openings in the side wall of the furnace to allow the side wall contacts to pass into the furnace. Each of the openings is equipped with a sealing means for maintaining a gas tight and liquid tight seal between the side wall and the side wall contact. It is preferred that the sealing means allows for radial movement of the contact into the furnace interior in order to compensate for the wear or consumption of the side wall contacts. It is also preferred that the furnace is equipped with a moving means for radially moving each of the side wall contacts into the furnace in order to compensate for the wear on the side wall contacts. Preferably, each of the side wall contacts is equipped with a moving means and each of the side wall contacts can be moved independent of the other side wall contacts to provide for individual adjustment of the side wall contacts in the furnace. [0009] The sealing means is also electrically insulated from the side wall. [0010] In another embodiment of the present invention, one or more of the side wall contacts is hollow and is equipped with a means for feeding charge or slag forming components through the hollow contact while preventing flow of slag through the hole in the contact. [0011] As will be appreciated in the electrode arrangement in the present invention, the side wall contacts are electrically interconnected and constitute a zero point for the current in the furnace. Wear on the side wall contacts can be compensated for by moving the side wall contacts radially inward from time to time. [0012] Because of the electrode arrangement of the present invention, the furnace bottom lining does not need to be electrically conductive and the furnace lining can therefore be designed to withstand the liquid slag and the high temperatures which exist in the furnace. This means that the material that is used to make up the furnace bottom lining can be solely based on its ability to withstand high temperatures and liquid slag. Thus, the present invention makes possible to use the material for the bottom lining onto which a bottom layer of frozen slag has formed. The formation of frozen slag on the bottom lining can be accomplished by using a good thermally conductive material and subjecting the bottom to external cooling. Furthermore, the use of an electrically non-conductive bottom lining means that the bottom lining need not be electrically insulated from the rest of the furnace. [0013] Preferably, the furnace of the present invention is equipped with a tap hole which is placed in the side wall of the furnace at a level below the side wall contacts. This allows for slag to be tapped from the furnace to below the level of the side wall contacts, thus, making it easier to restart the furnace. Brief Description of the Drawings [0014] These and other aspects of the present invention may be more fully understood by reference to one or more of the following drawings wherein: [0015] FIG. 1 shows a vertical sectional view through a slag smelting furnace equipped with the side wall contacts according to the present invention; [0016] FIG. 2 shows a horizontal view taken along A-A of FIG. 1; and [0017] FIG. 3 shows a horizontal view of the furnace of the present invention similar to the one shown in FIG 2 except one of the side wall contacts is hollow. Detailed Description of Preferred Embodiments [0018] In FIG. 1, smelting furnace 1 has a furnace pot with side wall 2 and bottom or bottom lining 3. The bottom lining 3 preferably comprises an electrically insulating refractory material. Furnace 1 is equipped with three conventional vertical carbon electrodes 4. Electrodes 4 are equipped with holding and slipping means 5 to allow for vertical movement of the electrodes and current clamps 6 to provide electric current to electrodes 4 from a power source (not shown) in a conventional manner. [0019] Four horizontal side wall contacts 7 pass through openings 8 in side wall 2 of furnace 1 such that side wall contacts 7 extend into the interior 17 of furnace 1. Side wall contacts 7 are electrically interconnected by electrical conductor 9. Side wall contacts and their electrical conductor 9 are grounded so as to provide a zero point for the current, but are not connected to the power source. Each of side wall contacts 7 has a sealing means 10 which prevents liquid slag from escaping through openings 8. Sealing means 10 also electrically insulates side wall contacts 7 from side wall 2 and allows for horizontal movement of side wall contacts 7 into furnace 1. Such sealing means are conventional and are typically employed for electrodes which are used in the side walls of furnaces. [0020] Tap hole 11 is positioned in the side wall 2 of furnace 1 to allow molten slag to be removed from furnace 1 to a level below the height of side wall contacts 7. This tap hole is conventional and is operated in a conventional manner. [0021] In order to adjust the depth to which side wall contacts 7 extend into furnace 1, moving means 12 is employed with each side wall contact 7. Moving means 12 moves contact 7 into the furnace. Moving means 12 is conventional and can be operated in a conventional manner. [0022] Side wall contacts 7 are preferably conventional carbon bodies which are used in the smelting industry to conduct electricity in a smelting furnace. As side wall contacts 7 are worn down inside furnace 1, moving means 12 moves contacts 7 into furnace 1. Additional carbon bodies 7 A as shown in FIG. 1 are attached to the end of side wall contact 7 which extends outside the furnace so as to provide a continuous feed of side wall contacts 7 into the furnace. Such carbon bodies are conventional as is the means to connect multiple carbon bodies to each other. [0023] One or more side wall contacts 7 may be hollow. FIG. 3 is similar to FIG. 2 except for the fact that contact 13 is hollow and has means 14 for feeding slag forming components to furnace 1 through opening 15. The use of hollow side wall contact 13 allows for charge or slag forming materials to be fed to furnace 1. The use of opening 15 in side wall 2 of furnace 1 to feed charge to furnace 1 is operated in a conventional manner using conventional equipment.

Claims

What is claimed is:
1. An electrode arrangement for an electric slag melting furnace comprising a bottom wall and at least one side wall defining a furnace interior, said furnace having vertical electrodes for supply of alternating electric current, said vertical electrodes being intended to be submerged in a liquid slag bath, said electrode arrangement being characterized in that the furnace has at least one side wall contact extending into the furnace interior through a side wall of the furnace.
2. Electrode arrangement according to claim 1, wherein there are two or more side wall contacts and all the side wall contacts are electrically interconnected.
3. Electrode arrangement according to claim 1, characterized in that at least three side wall contacts are equally circumferentially spaced around the furnace side wall.
4. Electrode arrangement according to claim 1, characterized in that the side wall contacts are carbon bodies inserted into sealed openings in the side wall of the furnace.
5. Electrode arrangement according to claim 1, characterized in that each side wall contact is equipped with means for moving the side wall contact radially into the furnace in order to compensate for wear of the side wall contacts.
6. Electrode arrangement according to claim 1, characterized in that the side wall contacts are hollow and have means for feeding slag forming components through the hollow contacts.
7. A process for heating a mass of slag in an electric slag smelting furnace comprising a bottom wall and at least one side wall defining a furnace interior, a plurality of vertical electrodes above said interior, and at least one side wall contact extending into said interior, said process comprising passing an alternating electric current from at least one of said vertical electrodes through a mass of slag in said interior and to at least one of said side wall contacts.
8. The process of claim 7, wherein at least one of said side wall contacts is hollow and defines an opening, said process further comprising feeding slag forming components through said opening into said furnace interior.
9. The process of claim 7, wherein said bottom includes a lining comprising an electrically insulating refractory material.
PCT/US2004/026858 2003-08-23 2004-08-17 Electrode arrangement as substitute bottom for an electrothermic slag smelting furnace WO2005022060A2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CA002536617A CA2536617A1 (en) 2003-08-23 2004-08-17 Electrode arrangement as substitute bottom for an electrothermic slag smelting furnace
AU2004268194A AU2004268194A1 (en) 2003-08-23 2004-08-17 Electrode arrangement as substitute bottom for an electrothermic slag smelting furnace
BRPI0413036-7A BRPI0413036A (en) 2003-08-23 2004-08-17 electrode arrangement as substitute bottom of an electrothermal slag melting furnace
EP04781525A EP1671072A2 (en) 2003-08-23 2004-08-17 Electrode arrangement as substitute bottom for an electrothermic slag smelting furnace
NO20055644A NO20055644L (en) 2003-08-23 2005-11-29 Electrode arrangement as an alternative base for an electrothermal furnace

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/646,507 2003-08-23
US10/646,507 US6980580B2 (en) 2003-08-23 2003-08-23 Electrode arrangement as substitute bottom for an electrothermic slag smelting furnace

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WO2005022060A2 true WO2005022060A2 (en) 2005-03-10
WO2005022060A3 WO2005022060A3 (en) 2005-08-11

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US (1) US6980580B2 (en)
EP (1) EP1671072A2 (en)
CN (1) CN1839290A (en)
AU (1) AU2004268194A1 (en)
BR (1) BRPI0413036A (en)
CA (1) CA2536617A1 (en)
NO (1) NO20055644L (en)
RU (1) RU2006105476A (en)
WO (1) WO2005022060A2 (en)

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WO2009073381A1 (en) * 2007-12-04 2009-06-11 Alcoa Inc. Apparatus and method of carbothermic aluminium production
WO2010033108A1 (en) 2008-09-16 2010-03-25 Alcoa Inc. Sidewall and bottom electrode arrangement for electrical smelting reactors and method for feeding such electrodes
CN104233378A (en) * 2008-09-16 2014-12-24 美铝公司 Method for providing working current for metallurgical reactor

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US20080016984A1 (en) * 2006-07-20 2008-01-24 Alcoa Inc. Systems and methods for carbothermically producing aluminum
US7556667B2 (en) 2007-02-16 2009-07-07 Alcoa Inc. Low carbon aluminum production method using single furnace carbothermic reduction operated in batch mode
US9068246B2 (en) * 2008-12-15 2015-06-30 Alcon Inc. Decarbonization process for carbothermically produced aluminum
EP2530057B1 (en) * 2011-05-31 2019-04-10 Corning Incorporated Glass melt handling equipment and method

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US7854783B2 (en) 2007-12-04 2010-12-21 Alcoa Inc. Carbothermic aluminum production apparatus, systems and methods
RU2486268C2 (en) * 2007-12-04 2013-06-27 Алкоа Инк. Device and method for coal thermal production of aluminium
RU2614223C2 (en) * 2007-12-04 2017-03-23 Алкоа Инк. Carbothermic aluminium production apparatus and method
WO2010033108A1 (en) 2008-09-16 2010-03-25 Alcoa Inc. Sidewall and bottom electrode arrangement for electrical smelting reactors and method for feeding such electrodes
US8728385B2 (en) 2008-09-16 2014-05-20 Alcoa Inc. Sidewall and bottom electrode arrangement for electrical smelting reactors and method for feeding such electrodes
CN104233378A (en) * 2008-09-16 2014-12-24 美铝公司 Method for providing working current for metallurgical reactor

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NO20055644L (en) 2005-11-29
WO2005022060A3 (en) 2005-08-11
RU2006105476A (en) 2006-07-27
AU2004268194A1 (en) 2005-03-10
CA2536617A1 (en) 2005-03-10
US20050041719A1 (en) 2005-02-24
CN1839290A (en) 2006-09-27
BRPI0413036A (en) 2006-12-26
US6980580B2 (en) 2005-12-27
EP1671072A2 (en) 2006-06-21

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