EP0204647B1 - Dispositif de connexion entre cuves d'électrolyse à tres haute intensité pour la production d'aluminium, comportant un circuit d'alimentation et un circuit indépendant de correction du champ magnétique - Google Patents

Dispositif de connexion entre cuves d'électrolyse à tres haute intensité pour la production d'aluminium, comportant un circuit d'alimentation et un circuit indépendant de correction du champ magnétique Download PDF

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Publication number
EP0204647B1
EP0204647B1 EP86420146A EP86420146A EP0204647B1 EP 0204647 B1 EP0204647 B1 EP 0204647B1 EP 86420146 A EP86420146 A EP 86420146A EP 86420146 A EP86420146 A EP 86420146A EP 0204647 B1 EP0204647 B1 EP 0204647B1
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EP
European Patent Office
Prior art keywords
current
cell
circuit
conductors
series
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.)
Expired - Lifetime
Application number
EP86420146A
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German (de)
English (en)
French (fr)
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EP0204647A1 (fr
Inventor
Joseph Chaffy
Bernard Langon
Michel Leroy
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Rio Tinto France SAS
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Aluminium Pechiney SA
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Publication date
Application filed by Aluminium Pechiney SA filed Critical Aluminium Pechiney SA
Priority to AT86420146T priority Critical patent/ATE49612T1/de
Publication of EP0204647A1 publication Critical patent/EP0204647A1/fr
Priority to MYPI87001502A priority patent/MY101994A/en
Application granted granted Critical
Publication of EP0204647B1 publication Critical patent/EP0204647B1/fr
Anticipated expiration legal-status Critical
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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
    • C25C3/00—Electrolytic production, recovery or refining of metals by electrolysis of melts
    • C25C3/06—Electrolytic production, recovery or refining of metals by electrolysis of melts of aluminium
    • C25C3/16—Electric current supply devices, e.g. bus bars

Definitions

  • the invention relates to a method of electrical connection between successive tanks of a series for the production of aluminum by electrolysis of alumina dissolved in molten cryolite, according to the Hall-Héroult process and comprising.
  • Each tank is constituted by a parallelepipedal metallic box, heat-insulated, supporting a cathode constituted by carbon blocks in which are sealed steel bars, called cathode bars, which serve to evacuate the current from the cathodes to the anodes of the next tank.
  • the anode system also made of carbon, is fixed on an anode bar called "cross” or “anode frame” adjustable in height, electrically connected to the cathode bars of the previous tank.
  • the electrolysis bath that is to say the solution of alumina in cryolite melted at 930 - 960 ° C.
  • the alumina produced is deposited on the cathode; a layer of liquid aluminum is permanently maintained at the bottom of the cathode crucible.
  • the anode frame supporting the anodes is, in general, parallel to its long sides, while the cathode bars are parallel to its short sides, called tank heads.
  • the tanks are arranged in rows and arranged lengthwise or, most often at present, crosswise, depending on whether their long side or their short side is parallel to the axis of the row.
  • the tanks are electrically connected in series, the ends of the series being connected to the positive and negative outputs of an electrical rectification and regulation substation.
  • Each series of tanks comprises a certain number of lines connected in series, the number of lines being preferably even in order to minimize the lengths of the conductors.
  • the object of the invention is a connection method, that is to say an arrangement of conductors making it possible to operate electrolytic cells, arranged crosswise, under more than 150,000 amperes and up to 500 to 600,000 amperes, with a current efficiency of 93 to 97%, while greatly reducing the weight of the connecting conductors between tanks and the spacing between tanks.
  • the right head of the tank the small side of the tank located to the right of an observer placed in the axis of the queue of tanks and looking in the direction of the current flowing through this queue of tanks.
  • the present invention is based on a double idea, entirely different from the conceptions of the prior art, which consists in separating the two functions "transport of the etoctrotysis current” which we will try to make as simple and as direct as possible, and “magnetic field balancing", which will be provided by independent conductors.
  • the object of the present invention is therefore a method of electrical connection between two successive tanks of a series intended for the production of aluminum by electrolysis of alumina dissolved in molten cryolite, according to the Hall process -Hérouft, at an intensity at least equal to 150 kA and up to 500 to 600 kA, each tank being constituted by a heat-insulated parallelepipedal metal box, whose major axis is perpendicular to the axis of the series, and whose two ends are called "heads", this box supporting a cathode formed by the juxtaposition of carbon blocks in which are sealed metal bars, the ends of which come out of the box, on the two long sides, upstream and downstream (relative or direction of the current in the series), each tank further comprising an anode system formed by at least one horizontal rigid beam supporting at least one and most often two barr are horizontal conductors, called “anode frame", on which the anode suspension rods are subject, this connection circuit comprising, in particular, a circuit for
  • the total current J2 flowing through the magnetic correction circuit is or more equal to the electrolysis current J1.
  • independent circuits means that the circuits follow separate paths and fulfill distinct functions, which does not exclude that they may be supplied by the same source of direct current, or by two branches of the same source.
  • the cathode outputs such as (2), drawn in thick lines, are connected to upstream cathode collectors such as (3), likewise, your downstream cathode outputs, such as (4) are connected to downstream cathode collectors such as (5).
  • Each climb (8) is double; it comprises a branch (8A) directly connected to a downstream cathode collector (5) and a branch (8B), connected to an upstream cathode collector (3) by at least one connecting bar (9) passing under the tank, following a route close to the most direct route.
  • each bar (9) being connected to two upstream cathode outputs (2) by a collector (3).
  • this arrangement offers the advantage of being suitable for modular construction.
  • the connecting bars (9) passing under the box (1) are not part of the module. Their position can indeed vary from one module to another so as to adjust the map of magnetic fields to the most favorable configuration. It will also be noted that the modules (14) located on a half-tank are generally symmetrical, rather than identical, with respect to the modules located on the other half-tank (with respect to the axis Ox).
  • This arrangement of the conductors gives, for the intensities considered, a map of the magnetic field, completely unacceptable and incompatible with stable operation of the tank. For example, it may be that, for a vessel 480 made according to this method, one obtains a Bz max exceeding 120-10- 4 Tesla (120 gauss).
  • FIG. 2 shows your distribution of the vertical components of the magnetic field on the long axis of the tank, before and after correction by the balancing circuit, object of the invention; the By values without correction are such that normal operation of the tanks would be impossible. Note that these values are taken at the level of the electrolysis-metal interface and in the vertical plane containing the largest axis of the cell.
  • FIG. 5 we have taken the case of a series composed of two parallel rows A and B, comprising a number of tanks which may be any (one hundred for example). These tanks are symbolized by a simple rectangle (11).
  • the parallel axes X1, X1 and X2, X2 are located a distance which can be of the order of a hundred meters.
  • each conductor or bundle of conductors grouped being traversed by a current in the same direction as the direction of the current in the series.
  • the first correction conductor (16) has a first section (17) on the outside of the A series, traversed by a current in the same direction as the current which feeds this series A, then a connection section (18) which bypasses the head of series A and the free space between series A and B, then a section (19), on the side outside of series B, the current in this section (19) being in the same direction as that which supplies the series.
  • the second correction conductor (21) comprises a first branch (22), which runs along the interior side of the A series, then a connection section (23) which bypasses the free space between the A and B series, and a section (24) which runs along the inside of series B, the current in sections 17 and 22 on the one hand and 19 and 24 on the other hand, being in the same direction as that of the current which feeds the corresponding line.
  • the total intensity J2 is adjusted in the correction conductors (16) and (21) so as to re-establish a map of the magnetic fields ensuring normal operation, stability and optimal performance of all the series.
  • This intensity is at most equal J1 and is normally between at least 5% and up to 80% of the total intensity J1 supplying the series proper, and preferably between 20 and 70% of J1.
  • the correction current could be fixed for example between 100 and 150 kA, in each external and internal branch of the correction circuit, the value of J2 equal to twice 135 kA being generally close to the optimal for an isolated series, without taking into account the effect of neighboring file, the correction conductor being arranged 1.5 meters from the external wall of the metal boxes of the tanks. This is an order of magnitude, and the exact optimum value depends on the position with respect to the box and at the level of the bath + metal interface, of the independent correction conductors.
  • the present invention also makes it possible to compensate for the neighboring queue effect.
  • the current is distributed in each of the sets of internal and external correction conductors (16) and (21) in a different manner from that which provided magnetic balancing in the absence of a neighboring line: this is how that, for two series A and B, whose axes are 130 meters apart, the intensity J will be reduced from 135 to 120 kA in the external correction conductor (16) and increased from 135 to 150 kA in the correction conductor (21), the total intensity J2 remaining equal to 270 kA, or 56% of J1.
  • the intensity will be lowered to 105 kA in (16) and increased to 180 kA in (21), the total intensity J2 being thus only increased by 15 kA , to settle at 285 kA, or 60% of J1.
  • the invention was applied to a small experimental series of electrolytic cells, arranged transversely to the axis of the series, and operating at 480 kA.
  • the arrangement of the connection conductors between tanks is in accordance with that of FIGS. 3 and 4, each of the mounted (8) (-8A + 8B) carrying 60 kA.
  • cathode outputs (4) are connected to a downstream cathode collector (5), which therefore collects 30 kA, and feeds the corresponding half-rise (8B).
  • the spacing between bars (9) passing under the tank can be modulated according to whether they correspond to cathode outputs, located in the center of the tank or near the heads, i.e. relative to their distance from the small axis of the tank so as to refine the map of the magnetic field but while respecting the direct path "as has been defined elsewhere.
  • the distance between the bars (9) located on the side of the heads of the tank is less than the distance between the bars (9) located in the center of the tank
  • These bars (9) can also be equidistant.
  • a neighboring line was simulated by a bundle of conductors arranged parallel to the axis OX, considering that the axes of the real series and of the simulated series were distant from 65 meters.
  • the correction conductor (16), placed on the opposite side of the simulated neighboring line, is supplied at 105 kA and the correction conductor (21) placed on the side of the simulated neighboring queue, under 180 kA, i.e. a total correction current J2 - 285 kA (60% of J1).
  • the weight gain on all of the conductors can be estimated at around 14,000 kg of aluminum per cell, for this series having an electrolysis intensity of 480 kA. Added to this is a gain of 350 mm on the center-to-center of tank to tank, which represents a saving of 84 meters of building for a complete series of 240 tanks.
  • the implementation of the invention therefore opens the way to a new generation of electrolysis cells operating at an intensity which can reach and greatly exceed 500 kA. with remarkable stability and a Faraday yield at least equal to that of previous generations A 250 - 300 kA.
  • the invention is not limited to very high power electrolysis cells, in the range of 500 kA, the invention has also been applied to cells operating at 280 kA.
  • the implementation of the independent correction circuit and of the modular design of the tank-to-tank connection conductors further leads to a significant gain in manufacturing costs, of installation and surface occupied by buildings.
  • FIG. 9 represents two successive half-tanks in a series operating at 280 kA, with 5 modular rises (8) each carrying 56 kA from tank n to the anode frame of tank n + 1 in the series.
  • Each independent correction conductor (17) (27) is supplied at 90 kA in the absence of a neighboring line, this current flowing in the same direction as that which supplies the series proper for carrying out the electrolysis, ie a total current of correction J2 equal to 180 kA, therefore 64% of J1.
  • the tanks thus supplied showed very stable operation and a current yield (Faraday yield) of between 93 and 95%.
  • the weight gain on the conductors is not significant, on the other hand, the 270 mm gain on the tank-to-tank center distance represents a saving of approximately 64 meters in length of the building for a complete series of 240 tanks.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electrolytic Production Of Metals (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
  • Internal Circuitry In Semiconductor Integrated Circuit Devices (AREA)
  • Immobilizing And Processing Of Enzymes And Microorganisms (AREA)
  • Apparatus Associated With Microorganisms And Enzymes (AREA)
  • Measuring Magnetic Variables (AREA)
  • Lasers (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)
  • Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
  • Multi-Conductor Connections (AREA)
  • Hall/Mr Elements (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Thin Magnetic Films (AREA)
  • Electrodes For Compound Or Non-Metal Manufacture (AREA)
EP86420146A 1985-06-05 1986-06-03 Dispositif de connexion entre cuves d'électrolyse à tres haute intensité pour la production d'aluminium, comportant un circuit d'alimentation et un circuit indépendant de correction du champ magnétique Expired - Lifetime EP0204647B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AT86420146T ATE49612T1 (de) 1985-06-05 1986-06-03 Verbindung zwischen elektrolyseoefen sehr hoher stromstaerken zur aluminiumherstellung, die aus einem stromfuehrungskreis und aus einem unabhaengigen kreis zum korrigieren des magnetfeldes besteht.
MYPI87001502A MY101994A (en) 1985-06-05 1987-09-01 A device for connection between very high intensity electrolysis cells for the production of aluminium comprising a supply circuit and an independent circuit for correcting the magnetic field

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8508924 1985-06-05
FR8508924A FR2583069B1 (fr) 1985-06-05 1985-06-05 Dispositif de connexion entre cuves d'electrolyse a tres haute intensite, pour la production d'aluminium, comportant un circuit d'alimentation et un circuit independant de correction du champ magnetique

Publications (2)

Publication Number Publication Date
EP0204647A1 EP0204647A1 (fr) 1986-12-10
EP0204647B1 true EP0204647B1 (fr) 1990-01-17

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EP86420146A Expired - Lifetime EP0204647B1 (fr) 1985-06-05 1986-06-03 Dispositif de connexion entre cuves d'électrolyse à tres haute intensité pour la production d'aluminium, comportant un circuit d'alimentation et un circuit indépendant de correction du champ magnétique

Country Status (24)

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US (1) US4713161A (no)
EP (1) EP0204647B1 (no)
JP (1) JPS6244590A (no)
CN (1) CN1004885B (no)
AT (1) ATE49612T1 (no)
AU (1) AU580237B2 (no)
BR (1) BR8602591A (no)
CA (1) CA1271725A (no)
DE (1) DE3668332D1 (no)
ES (1) ES8800371A1 (no)
FR (1) FR2583069B1 (no)
GR (1) GR861423B (no)
HU (1) HU212070B (no)
IN (1) IN167435B (no)
IS (1) IS1358B6 (no)
MX (1) MX168005B (no)
MY (1) MY101994A (no)
NO (1) NO173618C (no)
NZ (1) NZ216365A (no)
OA (1) OA08337A (no)
SA (1) SA90100211B1 (no)
SU (1) SU1595345A3 (no)
YU (1) YU46608B (no)
ZA (1) ZA864156B (no)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11286574B2 (en) 2016-07-26 2022-03-29 Tokai Cobex Gmbh Cathode current collector/connector for a Hall-Heroult cell

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US4976841A (en) * 1989-10-19 1990-12-11 Alcan International Limited Busbar arrangement for aluminum electrolytic cells
FR2789407B1 (fr) * 1999-02-05 2001-03-23 Pechiney Aluminium Arrangement de cuves d'electrolyse pour la production d'aluminium
GB0200438D0 (en) 2002-01-10 2002-02-27 Univ Coventry Stabilisation of liquid metal electrolyte systems
FR2868436B1 (fr) 2004-04-02 2006-05-26 Aluminium Pechiney Soc Par Act Serie de cellules d'electrolyse pour la production d'aluminium comportant des moyens pour equilibrer les champs magnetiques en extremite de file
NO322258B1 (no) * 2004-09-23 2006-09-04 Norsk Hydro As En fremgangsmate for elektrisk kobling og magnetisk kompensasjon av reduksjonsceller for aluminium, og et system for dette
RU2316619C1 (ru) * 2006-04-18 2008-02-10 Общество с ограниченной ответственностью "Русская инжиниринговая компания" Устройство для компенсации магнитного поля, наведенного соседним рядом последовательно соединенных электролизеров большой мощности
DE602008002312D1 (de) 2008-01-21 2010-10-07 Alcan Int Ltd Vorrichtung und Verfahren zum Kurzschließen einer oder mehrerer Zellen in einer Anordnung von Elektrolysezellen zur Herstellung von Aluminium
CN101307466B (zh) * 2008-02-18 2011-09-14 河南中孚实业股份有限公司 水平电流铝电解槽
FI121472B (fi) * 2008-06-05 2010-11-30 Outotec Oyj Menetelmä elektrodien järjestämiseksi elektrolyysiprosessissa, elektrolyysijärjestelmä ja menetelmän käyttö ja/tai järjestelmän käyttö
FR2961829B1 (fr) 2010-06-28 2012-07-13 Ecl Dispositif extracteur de cales de court-circuitage destine a la mise en circuit d'une cellule d'electrolyse pour la production d'aluminium
FR2961828B1 (fr) 2010-06-28 2012-08-10 Alcan Int Ltd Dispositif permettant d'extraire des cales de court-circuitage lors de la mise en circuit d'une cellule d'electrolyse pour la production d'aluminium
FR2964984B1 (fr) * 2010-09-17 2012-08-31 Alcan Int Ltd Dispositif de connexion electrique entre deux cellules successives d'aluminium
DE102011078002A1 (de) * 2011-06-22 2012-12-27 Sgl Carbon Se Ringförmige Elektrolysezelle und ringförmige Kathode mit Magnetfeldkompensation
CN103649375A (zh) 2011-07-12 2014-03-19 力拓艾尔坎国际有限公司 包含由超导材料制成的电导体的铝厂
FR2977898A1 (fr) * 2011-07-12 2013-01-18 Rio Tinto Alcan Int Ltd Aluminerie comprenant des cuves a sortie cathodique par le fond du caisson et des moyens de stabilisation des cuves
CN102953089B (zh) * 2011-08-30 2014-12-17 沈阳铝镁设计研究院有限公司 不完全对称供电整流系统为铝电解槽直流系统供电结构
CN103850482B (zh) * 2012-11-28 2016-02-10 沈阳铝镁设计研究院有限公司 一种大型铝厂及铝土矿区机车整备车间的配置方法
FR3009564A1 (fr) * 2013-08-09 2015-02-13 Rio Tinto Alcan Int Ltd Aluminerie comprenant un circuit electrique de compensation
RU2566120C1 (ru) * 2014-07-24 2015-10-20 Общество с ограниченной ответственностью "Объединенная Компания РУСАЛ Инженерно-технологический центр" Ошиновка алюминиевого электролизера
FR3032459B1 (fr) 2015-02-09 2019-08-23 Rio Tinto Alcan International Limited Aluminerie et procede de compensation d'un champ magnetique cree par la circulation du courant d'electrolyse de cette aluminerie
FR3042509B1 (fr) 2015-10-15 2017-11-03 Rio Tinto Alcan Int Ltd Serie de cellules d'electrolyse pour la production d'aluminium comportant des moyens pour equilibrer les champs magnetiques en extremite de file
GB2549731A (en) * 2016-04-26 2017-11-01 Dubai Aluminium Pjsc Busbar system for electrolytic cells arranged side by side in series
RU2678624C1 (ru) * 2017-12-29 2019-01-30 Общество с ограниченной ответственностью "Объединенная Компания РУСАЛ Инженерно-технологический центр" Ошиновка модульная для серий алюминиевых электролизеров
US11713511B2 (en) * 2020-10-26 2023-08-01 Key Dh Ip Inc./Ip Strategiques Dh, Inc. High power water electrolysis plant configuration optimized for sectional maintenance

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FR2425482A1 (fr) * 1978-05-11 1979-12-07 Pechiney Aluminium Procede de compensation du champ magnetique induit par la file voisine dans les series de cuves d'electrolyse a haute intensite
JPS5767184A (en) * 1980-10-08 1982-04-23 Mitsubishi Keikinzoku Kogyo Kk Stabilizing method for metallic bed of aluminum in electrolytic cell for aluminum
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11286574B2 (en) 2016-07-26 2022-03-29 Tokai Cobex Gmbh Cathode current collector/connector for a Hall-Heroult cell

Also Published As

Publication number Publication date
ATE49612T1 (de) 1990-02-15
HU212070B (en) 1996-01-29
YU46608B (sh) 1994-01-20
ES8800371A1 (es) 1987-10-16
CN86103689A (zh) 1987-01-07
ES555693A0 (es) 1987-10-16
NZ216365A (en) 1990-03-27
MY101994A (en) 1992-02-29
DE3668332D1 (de) 1990-02-22
NO173618B (no) 1993-09-27
OA08337A (fr) 1988-02-29
NO173618C (no) 1994-01-05
NO862196D0 (no) 1986-06-03
AU5833086A (en) 1986-12-11
ZA864156B (en) 1987-02-25
SA90100211B1 (ar) 2004-07-26
US4713161A (en) 1987-12-15
FR2583069A1 (fr) 1986-12-12
CN1004885B (zh) 1989-07-26
IS3104A7 (is) 1986-12-06
GR861423B (en) 1986-09-05
SU1595345A3 (ru) 1990-09-23
IN167435B (no) 1990-10-27
YU95086A (en) 1988-04-30
FR2583069B1 (fr) 1987-07-31
NO862196L (no) 1986-12-08
HUT59968A (en) 1992-07-28
EP0204647A1 (fr) 1986-12-10
AU580237B2 (en) 1989-01-05
CA1271725A (fr) 1990-07-17
IS1358B6 (is) 1989-04-19
JPS6244590A (ja) 1987-02-26
BR8602591A (pt) 1987-02-03
MX168005B (es) 1993-04-28

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