EP3099844B1 - Cuve d'electrolyse comportant un ensemble anodique contenu dans une enceinte de confinement - Google Patents

Cuve d'electrolyse comportant un ensemble anodique contenu dans une enceinte de confinement Download PDF

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Publication number
EP3099844B1
EP3099844B1 EP15740994.7A EP15740994A EP3099844B1 EP 3099844 B1 EP3099844 B1 EP 3099844B1 EP 15740994 A EP15740994 A EP 15740994A EP 3099844 B1 EP3099844 B1 EP 3099844B1
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EP
European Patent Office
Prior art keywords
electrical conductor
electrolytic cell
anode
confinement chamber
movable
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.)
Active
Application number
EP15740994.7A
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German (de)
English (en)
French (fr)
Other versions
EP3099844A4 (fr
EP3099844A1 (fr
Inventor
Olivier Martin
Christian Duval
Steeve RENAUDIER
Benoit BARDET
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rio Tinto Alcan International Ltd
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Rio Tinto Alcan International Ltd
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Publication date
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Publication of EP3099844A4 publication Critical patent/EP3099844A4/fr
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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
    • C25C3/08—Cell construction, e.g. bottoms, walls, cathodes
    • C25C3/12—Anodes
    • 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
    • C25C3/08—Cell construction, e.g. bottoms, walls, cathodes
    • C25C3/10—External supporting frames or structures
    • 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
    • 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
    • C25C3/22—Collecting emitted gases

Definitions

  • the present invention relates to an electrolytic cell, intended for the production of aluminum by electrolysis.
  • an electrolysis cell conventionally comprising a steel box inside which is arranged a coating of refractory materials, a cathode of carbonaceous material, crossed by cathode conductors intended to collect the electrolysis current at the cathode to lead it to cathodic outlets passing through the bottom or the sides of the box, routing conductors extending substantially horizontally to the next tank from the cathodic outlets, an electrolytic bath in which is dissolved the alumina, at least one anode assembly comprising a substantially vertical anode rod and at least one anode block suspended from the anode rod and immersed in this electrolytic bath, an anode frame from which the anode assembly is suspended via the anode rod substantially vertical and movable with the anode frame relative to the casing and the cathode, and flexible current-raising conductors cell, extending from bottom to top, connected to the
  • gases are produced, in particular carbon dioxide which is released at the anode and hydrogen fluoride (HF) which escapes from the electrolytic bath.
  • HF hydrogen fluoride
  • a cowling traditionally covers the opening delimited by the box. These gases can then be regularly collected, for example with a view to their treatment and subsequent recovery.
  • Dynamic sealing means are generally provided to prevent gases from leaking through the junction provided between the cowling and the anode rods.
  • dynamic sealing means is meant sealing means which ensure the confinement of the gases during the movement of the anode rods.
  • Such a dynamic sealing means is known in particular from the document WO2004/035872 on behalf of Aluminum Pechiney.
  • handling the anode rods, which are part of the anode assembly can cause damage to the dynamic sealing means with which they cooperate.
  • damaged sealing means can affect the sealing of the cowling, so that the gases generated during the electrolysis reaction cannot be collected in full, or that the gas suction rate must be oversized.
  • the electrolytic cells of the state of the art comprise anode assemblies which interact with the cowling, in particular at the time of an anode change, so that the tightness of the cowling to the gases generated during of the electrolysis reaction may be affected.
  • the present invention aims to overcome all or part of these drawbacks by proposing an electrolysis cell offering improved sealing against the gases generated during the electrolysis reaction.
  • the present invention relates to an electrolytic cell as defined by claim 1.
  • the maintenance of the integrity of the elements forming the containment enclosure and therefore the containment of the gases generated during the electrolysis reaction are independent of any manipulation or movement of the anode assembly, so that the electrolysis according to the invention provides improved sealing.
  • the anode assembly is at a distance from the containment enclosure and does not interact with the latter, which differs from the electrolytic cells of the state of the art.
  • the movable electrical conductor does not extend above the anode blocks, in a volume obtained by vertical translation of a projected surface of the anode blocks in a horizontal plane.
  • the electrical connection between the movable electrical conductor and the anode support is necessarily made on one side of the electrolytic cell, but not above the anode blocks, nor advantageously above the opening delimited by the box and the interior lining.
  • the movable electrical conductor therefore does not interfere with vertical extraction of the anode blocks.
  • the electrolytic cell is intended to be arranged transversely with respect to the length of a row of electrolytic cells to which it belongs.
  • the containment enclosure comprises an upper portion forming a lid, said upper portion being removable to allow extraction of the anode assembly.
  • a removable upper portion makes it possible to carry out maintenance operations on the vessel in operation, in particular a change of anode assembly, without having to shut down the vessel or dismantle equipment necessary for the operation of the vessel such as gas suction devices or raw material feeders.
  • the electrolytic cell according to the invention offers the possibility of changing the anodes from the top of the cell, without any equipment of the cell obstructing the vertical stroke of the anode change, which makes it possible to carry out significant structural gains.
  • the electrical conductor is movable and the confinement enclosure comprises a fixed portion which has a window across which the movable electrical conductor extends, the movable electrical conductor comprising a first portion extending exterior of the confinement enclosure and a second portion extending inside the confinement enclosure and to which the anode support is electrically connected.
  • the mobile electrical conductor which is mobile, in particular in vertical translation passes through the fixed portion of the containment enclosure.
  • the electrolysis tank comprises sealing means to prevent gases generated during the electrolysis reaction from leaving the containment enclosure via the window through which the mobile electrical conductor passes.
  • the movable electrical conductor crosses the fixed portion of the confinement enclosure in a substantially vertical manner
  • the sealing means comprise a dynamic seal surrounding the movable electrical conductor
  • the seal advantageously remains immobile, on the fixed portion of the containment enclosure, while the mobile electrical conductor translates vertically inside this seal, preferably annular.
  • This solution has the advantage of being economical. Such a seal is not exposed to shocks due to changes of anodes, which differs from the electrolytic cells of the state of the art.
  • the part of the fixed portion of the containment enclosure traversed vertically by the mobile electrical conductor is a horizontal part which extends substantially horizontally.
  • the first portion of the movable electrical conductor extending outside the containment enclosure is arranged below the part of the fixed portion of the containment enclosure crossed vertically by the movable electrical conductor, while the second portion of the movable electrical conductor extending inside the containment enclosure is arranged above.
  • the mobile electrical conductor passes through the fixed portion from the bottom upwards from its first exterior portion to its second portion inside the containment enclosure. The length of the electrical electrolysis circuit is then minimized.
  • the movable electrical conductor advantageously comprises, between the second portion and the first portion, a sealing portion intended to cooperate with the sealing joint which is rectilinear and of constant section.
  • a sealing portion intended to cooperate with the sealing joint which is rectilinear and of constant section.
  • the movable electrical conductor crosses the fixed portion of the containment enclosure in a substantially horizontal manner
  • the sealing means include a sealing member configured to completely close the window of the fixed portion, regardless of the position of the mobile electrical conductor through the window.
  • sealing is ensured despite the movement, preferably in vertical translation, of the movable electrical conductor.
  • the sealing member surrounds the movable electrical conductor and is mounted integral with the movable electrical conductor.
  • the sealing member is movable concomitantly with the movable electrical conductor. This solution makes it possible to obtain a more efficient seal than with a sealing member which would be fixed and should adapt to the movement of the mobile electrical conductor.
  • the sealing member corresponds to a metal plate extending in a plane substantially parallel to the fixed portion traversed.
  • the use of a metal plate has the advantage of a contained cost while making it possible to withstand, without loss of performance in terms of sealing, the high temperatures generated by the electrolytic cell in operation, which can reach several hundred degrees Celsius inside the electrolytic cell.
  • a compensation member is arranged between the sealing member and the movable electrical conductor.
  • This compensation member allows the expansion of the movable electrical conductor and/or of the plate, taking into account the heat generated by the electrolytic cell in operation, while filling any play between the movable electrical conductor and the metal plate, which contributes to containment sealing.
  • the electrolytic cell comprises means for guiding the sealing member in translation, the guiding means comprising two substantially rectangular frames fixed against the fixed portion of the containment enclosure so as to surround the window of the fixed portion and arranged relative to each other to delimit between them a space inside which the sealing member is intended to slide, the electrolytic cell further comprising means for expansion compensation interposed between the two frames.
  • this solution offers effective and economical guidance of the metal plate, and makes it possible to preserve the tightness despite the high temperatures generated by the electrolytic cell in operation, thanks to the use of the means of compensation of expansion, such as flexible seals or brushes, allowing to absorb the dimensional variations of the frames and/or the metal plate while preserving the seal.
  • the electrical conductor is a non-deformable rigid electrical conductor.
  • the mobile electrical conductor is not flexible and cannot be deformed so that the cooperation between the mobile electrical conductor and the sealing means is facilitated.
  • the anode assembly is supported by the second portion of the electrical conductor and moved via the electrical conductor.
  • the electrolytic cell can advantageously be free of a support device for the anode assembly other than the moving electrical conductor(s), such a device being liable to affect the tightness of the containment enclosure, for example. if it passes through this containment enclosure.
  • the electrolytic cell comprises moving means intended to move the electrical conductor in substantially vertical translation, the moving means being arranged entirely outside the containment enclosure.
  • the movement applied by the displacement means to the movable electrical conductor is then transmitted indirectly to the anode support via the non-deformable rigid movable electrical conductor.
  • the mobile electrical conductor is fixed to the displacement means outside the containment enclosure.
  • the displacement means are a jack associated specifically with the movable electrical conductor serving as a support for the anode assembly.
  • the moving electrical conductor performs three functions in its interactions with the anode assembly. It electrically connects the anode assembly to the electrical conductors arranged outside the containment enclosure, supports it and moves it.
  • the movable electrical conductor can be a one-piece or composite electrical conductor with, for example, a steel structure more dedicated to supporting the anode assembly and to transmitting the displacement, and a copper or aluminum structure more dedicated to electrical conduction.
  • the electrical conductor does not extend directly above said anode assembly, more particularly said anode support and anode block.
  • the movable electrical conductor extends outside a volume obtained above the anode assembly by vertical translation of a projected surface of the anode assembly in a horizontal plane.
  • the movable electrical conductor is outside the vertical path of said anode assembly when it is withdrawn, so that no manipulation of the movable electrical conductor is necessary when changing the anode. This also makes it possible to prevent any risk of affecting the tightness of the confinement enclosure.
  • the electrical conductor is arranged under the anode support of the anode assembly.
  • the anode support can rest by gravity on the movable electrical conductor, so that the latter does not obstruct vertical withdrawal from above of the anode assembly, for example with a view to changing the anode.
  • the upper portion of the confinement enclosure rests on the fixed portion of the confinement enclosure.
  • the fixed portion delimits a substantially horizontal rectangular opening and the upper portion rests substantially horizontally on the fixed portion.
  • the electrolytic cell comprises sealing means interposed between the upper portion and the fixed portion.
  • the electrolytic cell comprises compression means intended to hold the upper portion pressed against the fixed portion.
  • the compression means make it possible to maintain the upper portion in contact with the fixed portion, to improve the tightness of the containment enclosure at the level of its junction between the removable upper portion and the lateral fixed portion.
  • This embodiment is all the more advantageous as sealing means are interposed between the upper portion and the fixed portion.
  • the upper portion comprises a plurality of adjacent covers that are substantially longitudinal and parallel to one another, extending in a direction that is substantially transverse to the electrolytic cell, between two opposite longitudinal edges of the electrolytic cell.
  • the electrolytic cell comprises means for fixing the anode support to the electrical conductor, the fixing means being entirely contained inside the containment enclosure.
  • the fixing means may comprise two complementary threads, the cooperation of which allows the fixing of the anode support and of the mobile electrical conductor by simple screwing.
  • the fixing means may comprise a screw connector performing compression of the anode support against the movable electrical conductor.
  • the electrolytic cell comprises several anode assemblies and, for each anode assembly, at least one electrical conductor electrically connected to the anode support.
  • the anode support comprises a bar which extends substantially horizontally between two opposite longitudinal edges of the electrolytic cell.
  • each of the opposite ends of the bar is electrically connected to an electrical conductor.
  • each of the opposite ends of the bar is supported by the second portion of an electrical conductor and moved via this electrical conductor.
  • the upper portion of the containment enclosure is designed to make it possible to extract the anode assembly by upward vertical translation of the anode assembly and to introduce the anode assembly by downward vertical translation of the anode assembly.
  • the fixed portion of the containment enclosure comprises a vertical part extending substantially vertically around and above the opening delimited by the box and the interior lining. This vertical part forms an interior volume allowing the movement of the anode assembly in the containment enclosure for the operation of the electrolytic cell.
  • the mobile electrical conductor has a polygonal section portion.
  • a non-claimed aspect relates to an aluminum smelter comprising at least one electrolytic cell having the aforementioned characteristics.
  • the aluminum smelter may comprise a plurality of electrolytic cells, among which said at least one electrolytic cell, forming a line, the electrolytic cells being arranged transversely with respect to the length of the line that they form.
  • the figure 1 shows an electrolytic cell 1 according to one embodiment of the invention.
  • the electrolysis tank 1 is intended for the production of aluminum by electrolysis.
  • the electrolytic cell 1 is intended to be arranged transversely with respect to the length of a row of electrolytic cells to which it belongs. Thus, it extends lengthwise in the longitudinal direction Y while the row of electrolytic cells extends lengthwise in the transverse direction X.
  • the electrolysis cell 1 comprises a box 2, which may be metallic, for example steel, and an interior coating 4, typically made of refractory materials.
  • the box 2 is here provided with cradles 6 of reinforcements.
  • the box 2 and its inner lining 4 delimits an opening across which are intended to extend a plurality of anode assemblies.
  • These anode assemblies comprise an anode support 8 and at least one anode block 10 or anode, supported by the anode support 8.
  • the anode support comprises for example a support bar 80, which can extend substantially horizontally between two opposite longitudinal edges of the electrolytic cell and the logs 81.
  • the anode block 10 is more particularly attached to the anode support 8 at the means of logs 81 sealed with cast iron in holes provided for this purpose in the anode block 10.
  • the anode or anode block 10 is in particular made of carbonaceous material, and more particularly of the prebaked type. It is intended in operation to be immersed in an electrolytic bath 12 and to be consumed there.
  • the anode assemblies are intended to be removed and replaced periodically as the anodes 10 wear out.
  • the electrolytic cell 1 comprises means for moving the anode assemblies, making it possible to translate the anode assemblies substantially vertically only. These means of movement will be described in more detail below.
  • the electrolytic tank 1 comprises flexible electrical conductors 14 which can extend on either side of the electrolytic tank 1, as can be seen in particular on the picture 3 , at the two longitudinal edges of the cell 1 of electrolysis.
  • the flexible electrical conductors 14 can extend from a single side of the electrolytic tank 1, at one of the two longitudinal edges of the electrolytic tank 1, also from bottom to top.
  • the flexible electrical conductors 14 are intended to conduct the electrolysis current to the anode blocks 10, from electrical conveying conductors (not shown) of a previous electrolytic cell in the line taking into account the overall direction of circulation of the electrolysis current, while accompanying and adapting by their flexibility to the movement in vertical translation of the anode assemblies.
  • the flexible electrical conductor 14 has two ends which can move relative to each other vertically while providing a permanent electrical connection.
  • the flexible electrical conductors 14 may correspond to a superposition of electrically conductive flexible sheets.
  • the electrolysis cell 1 also comprises a cathode 16, optionally formed of several cathode blocks of carbonaceous material, and traversed by cathode conductors 18 intended to collect the electrolysis current to conduct it towards cathode outputs 20 passing through the box 2 and connected to conveying conductors (not shown) in turn conducting the electrolysis current to the flexible electrical conductors 14 of a next electrolytic cell in the row.
  • a cathode 16 optionally formed of several cathode blocks of carbonaceous material, and traversed by cathode conductors 18 intended to collect the electrolysis current to conduct it towards cathode outputs 20 passing through the box 2 and connected to conveying conductors (not shown) in turn conducting the electrolysis current to the flexible electrical conductors 14 of a next electrolytic cell in the row.
  • the cathode conductors 18, the cathode outputs 20 and the routing conductors may correspond to metal bars, for example made of aluminium, copper or steel.
  • the electrolysis tank 1 comprises a containment enclosure 22 intended for the containment of the gases generated during the electrolysis reaction.
  • This containment enclosure delimits a closed volume above the opening in the casing and the interior lining, through which an anode assembly is intended to be moved.
  • This containment enclosure 22 can merge at least in part with the box and a superstructure of the electrolytic cell 1.
  • the containment enclosure 22 comprises a movable upper portion 220 forming a cover, arranged above a fixed portion 230.
  • the fixed portion 230 comprises more particularly the casing 2 and a substantially vertical wall 231 extending around the opening above the casing 2.
  • the substantially vertical wall 231 bears for example on the upper edges of the casing 2.
  • the portion 230 fixed is advantageously rigid, the wall 231 being immobile relative to the box 2.
  • the upper portion 220 is removable to allow extraction of the anode assemblies by towing them in a substantially vertical manner from above above the electrolytic cell 1, as illustrated in the figure 11 .
  • the fixed portion 230 forms an interior volume making it possible to extract the anode assembly by upward vertical translation of the anode assembly and to introduce the anode assembly by downward vertical translation of the anode assembly. An exclusively vertical movement of the anode assemblies above the opening encounters no obstacle.
  • anode assemblies are entirely contained in the containment enclosure 22 .
  • the electrolytic cell 1 also comprises movable electrical conductors 26, intended to conduct the electrolysis current to the anode support 8, from the flexible electrical conductors 14 .
  • the movable electrical conductors 26 comprise a second portion 260 disposed inside the containment enclosure 22 which is electrically connected to the anode assembly, in particular to the anode support 8, and more particularly to one end of the support bar 80 .
  • the movable electrical conductors 26 also include a first portion 262 disposed outside the containment enclosure 22 which is electrically connected to the flexible electrical conductors 14 .
  • the mobile electrical conductors 26 are advantageously rigid, non-deformable electrical conductors.
  • the movable electrical conductors 26 may correspond, for example, to a metal support bar, in particular made of steel, copper, aluminum or a steel/copper composite.
  • the mobile electrical conductor or conductors 26 extend outside the casing 2, without extending in line with the opening delimited by the casing 2 and its interior coating 4, above the latter, so that the electrical connection between the mobile electrical conductor(s) 26 and the corresponding anode support 8 is necessarily made on one side of the electrolytic cell 1, but not above the opening delimited by box 2. Thus, as is visible on the figure 10 , no obstacle hinders the extraction of the anode blocks 10 above the cell 1 of electrolysis.
  • the mobile electrical conductors 26 make it possible to convey the electrolysis current from the outside of the enclosure 22 of confinement to the anode assembly contained entirely in the enclosure 22 of confinement.
  • the movable electrical conductors 26 are movable concomitantly with the anode assembly. Thus, they are intended to be translated substantially vertically as the anodes 10 are consumed.
  • the flexible electrical conductors 14 are arranged outside the containment enclosure 22 . Each flexible electrical conductor 14 is electrically connected to a movable electrical conductor 26 and adapts to the displacement of this movable electrical conductor 26 and of the associated anode assembly.
  • the second portion 260 of the mobile electrical conductors 26 extends inside the enclosure 22 of confinement, so that the electrical connection with the anode support 8 is made inside the enclosure 22 of confinement.
  • the anode assembly is exempt from any interaction with the confinement enclosure 22, so that this confinement enclosure 22 does not risk being affected either by the replacement of the anode assembly or by the displacement of the anode assembly downwards as the consumption of its or its anode blocks 10.
  • the fixed portion 230 of the containment enclosure 22 has a window 232 through which extends one of the movable electrical conductors 26 which moves vertically.
  • the first portion 262 of the movable electrical conductor 26 extends outside the enclosure 22 of confinement, while its second portion 260 extends inside the enclosure 22 of confinement.
  • the movable electrical conductor 26 passes through the fixed portion 230 of the enclosure 22 of containment.
  • the electrolysis cell 1 then advantageously comprises sealing means to prevent the gases generated during the electrolysis reaction from leaving the containment enclosure 22 via the window 232 through which the movable electrical conductor 26 passes.
  • the mobile electrical conductors 26 pass through the fixed portion 230 of the containment enclosure 22, and more particularly the window 232, in a substantially vertical manner and move vertically in translation.
  • the part of the fixed portion 230 of the containment enclosure traversed vertically by the mobile electrical conductor 26 is a horizontal part which extends substantially horizontally.
  • This horizontal part of the containment enclosure 22 may for example be a flat area on the upper edges of the casing 2 or a horizontal wall attached to the upper edges of the casing 2.
  • the first portion 262 of the movable electrical conductor extending to the exterior of the containment enclosure is arranged below the part of the fixed portion 230 of the containment enclosure 22 through which the movable electrical conductor 26 passes vertically, while the second portion 260 of the movable electrical conductor 26 is extending inside the containment enclosure 22 is arranged above.
  • the mobile electrical conductor 26 passes through the fixed portion from the bottom upwards from its first exterior portion 262 to its second portion 260 inside the containment enclosure. The length of the electrical electrolysis circuit is then minimized.
  • the sealing means here comprise a dynamic seal 32 surrounding the electrical conductor 14 moving in vertical translation.
  • This annular dynamic seal 32 may for example consist of metal strips, brushes or a flexible or elastic material resistant to temperature and gases. Furthermore, these seals 32 will exhibit very low aging because they are not exposed to shocks.
  • the movable electrical conductor 26 comprises between the second portion 260 and the first portion 262 a sealing portion 261 intended to cooperate with the seal 32.
  • This sealing portion is advantageously rectilinear and of constant section, so as to improve sealing and facilitate the design of the dynamic seal.
  • the movable electrical conductors 26 pass through the fixed portion 230 of the containment enclosure 22, and more particularly the window 232, substantially horizontally and move vertically in translation.
  • the window 232 is more particularly formed in a part or wall 231 substantially of the fixed portion 230.
  • the sealing means then comprise a sealing member 34 configured to completely close the window 232 of the fixed portion, regardless of the position of the mobile electrical conductor 26 through the window 232.
  • the movable electrical conductors 26 are movable, with the anode assembly, between a first position, or high position ( figure 5 ), corresponding in particular to a position in which the anode assembly comprises a new anode block 10, and a second position, or low position ( figure 6 ), corresponding in particular to a position in which the anode block 10 is worn and must be replaced.
  • the difference between these two positions defines a vertical deflection d of the movable electrical conductor 26 to be allowed by the window 232 and the sealing means.
  • the sealing member 34 surrounds the movable electrical conductor 26 with which it is associated.
  • the sealing member 34 is mounted integral with this movable electrical conductor 26.
  • the sealing member 34 may for example comprise two parts between which the movable electrical conductor 26 is intended to be inserted, and fixing means, such as screws 36, for fixing the two parts to one another. other.
  • the sealing member 34 may correspond to a metal plate extending in a plane substantially parallel to the plane in which the adjacent fixed portion 230 extends.
  • a compensation member 38 can be arranged between the metal plate and the movable electrical conductor 26 that it surrounds.
  • the electrolytic cell 1 can further comprise means for guiding this metal plate in translation.
  • the guide means comprise for example two substantially rectangular frames 40, fixed against the fixed portion 230 of the containment enclosure 22 so as to surround the window 232, for example by means of screws 41, and arranged one by relative to each other to delimit between them a space within which the metal plate is intended to slide.
  • the electrolytic cell 1 can also comprise expansion compensation means interposed between the two frames, such as a flexible seal allowing it to be compressed sufficiently to bring the sealing member 34 and the frames 40 into contact, and this for seal while allowing sliding between the sealing member 34 and the frames 40.
  • the mobile electrical conductor 26 may have a portion with a polygonal section, for example a square or rectangular section, in particular at the passage of the confinement enclosure, so that a rotation of the mobile electrical conductor 26 around the axis in which it stretches, relative to the sealing means, is prevented.
  • anode assembly can be fully supported at each of the ends of the support bar 80 by the second portion 260 of the mobile electrical conductor(s) 26, so that no additional support device capable of interacting with the containment enclosure 22 is not necessary.
  • the mobile electrical conductors 26 thus provide both an electrical connection function with the anode assembly and a mechanical support function for the anode assembly ensuring the movement of the anode assembly.
  • the electrolytic cell 1 may comprise several movable electrical conductors 26 electrically connected to the same anode support 8, the second portions 260 of these movable electrical conductors 26 supporting the anode assembly.
  • the electrolytic cell 1 may comprise, for each anode support 8, two movable electrical conductors 26, one and the other arranged at two opposite sides of the electrolytic cell 1.
  • each anode support 8 may comprise an upstream end 82 electrically connected and supported by the second portion 260 of an upstream mobile electrical conductor 26, and a downstream end 83 electrically connected and supported by a downstream mobile electrical conductor 26 .
  • upstream/downstream are defined with respect to the overall direction of circulation of the electrolysis current in the row of electrolytic cells.
  • the electrolytic cell 1 comprises, for each anode support 8, a single movable electrical conductor 26, arranged at one of the two sides of the electrolytic cell 1. Where appropriate, it is the upstream end 82 which is advantageously electrically connected and supported by the movable electrical conductor 26, in order to minimize the overall length of the electrolysis conductor circuit.
  • the mobile electrical conductor(s) 26 are mobile with the anode assembly to which they are electrically connected.
  • the moving electrical conductors 26 can advantageously fully mechanically support the anode assembly to which they are electrically connected.
  • the electrolytic cell 1 may comprise moving means which are advantageously arranged to move the mobile electrical conductor or conductors 26, according to a vertical translational movement.
  • the displacement means comprise a separate jack 42 per mobile electrical conductor 26, of which a movable end is attached to the first portion 262 of one of the movable electrical conductors 26 supporting the anode assembly.
  • a fixed part of the actuator 42 can be attached to a fixed element, for example to the fixed portion 230 of the containment enclosure 22, in particular to the box 2 or to the wall 231.
  • Each mobile electrical conductor 26 is set in motion by separate displacement means and more particularly a separate cylinder 42.
  • the means of displacement of the various anode assemblies are therefore distinct.
  • the displacement means may comprise, on this side of the electrolytic tank 1 and similarly, a jack 42, one end of which is attached to the fixed portion 230 of the containment enclosure 22, while the end of the jack 42 is attached to the first portion 262 of the corresponding mobile electrical conductor 26 supporting the anode assembly.
  • the displacement means On the other side of the electrolytic cell 1, that is to say the side free of a mobile electrical conductor 26, the displacement means may comprise a jack 43 and a remote mobile support 45, guided vertically and supporting the anode assembly. Sealing means similar to those previously described can be provided around the support 45.
  • each movable electrical conductor 26 can be arranged under the anode support 8 of the anode assembly, so that the latter can rest by gravity on the second portion 260 of the movable electrical conductors 26 .
  • the mobile electrical conductor(s) 26 can extend under the anode support 8 of the anode assembly without extending above and in line with the corresponding anode assembly.
  • the electrolytic cell 1 may comprise sealing means interposed between the upper portion 220 and the fixed portion 230 on which the upper portion 220 rests at least in part.
  • the sealing means can include a static seal 44 interposed between the upper portion 220 and the fixed portion 230.
  • the electrolytic cell 1 may comprise compression means, such as a screw system, intended to hold the upper portion 220 pressed against the fixed portion 230.
  • the upper portion 220 may comprise a plurality of adjacent covers 222 that are substantially longitudinal and parallel to one another, extending along a direction X that is substantially transverse to the electrolytic cell 1, between two opposite longitudinal edges of the electrolytic cell 1.
  • the support means correspond for example to beams 46 extending along the substantially transverse direction X of the electrolytic cell 1. These beams 46 can be part of the superstructure.
  • the beams 46 can also support ancillary devices such as tapping and feeding devices.
  • the invention also relates to an aluminum smelter comprising at least one electrolytic cell 1 according to the invention.
  • the electrolytic cells of this aluminum smelter form a row, and are arranged transversely with respect to the length of this row.

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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)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
EP15740994.7A 2014-01-27 2015-01-23 Cuve d'electrolyse comportant un ensemble anodique contenu dans une enceinte de confinement Active EP3099844B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1400169A FR3016894B1 (fr) 2014-01-27 2014-01-27 Cuve d'electrolyse comportant un ensemble anodique contenu dans une enceinte de confinement
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FR3032454B1 (fr) * 2015-02-09 2020-10-23 Rio Tinto Alcan Int Ltd Systeme d'etancheite pour une cuve d'electrolyse
NO341336B1 (en) * 2015-11-20 2017-10-16 Norsk Hydro As Method and means for application of anode covering material (ACM)in an electrolysis cell of Hall-Héroult type for aluminium production.
CN109715862B (zh) * 2016-09-19 2021-11-16 艾莱西丝有限合伙企业 阳极装置及其相关方法
CN110872717A (zh) * 2018-08-30 2020-03-10 武汉市德成科技工程研究院有限责任公司 一种新型铝电解槽炭连续阳极的导电方式
FR3090700B1 (fr) * 2018-12-20 2021-01-01 Rio Tinto Alcan Int Ltd Ensemble anodique et cuve d’électrolyse comprenant cet ensemble anodique

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CA2935676C (fr) 2023-03-28
CN105934538B (zh) 2019-03-19
BR112016015154B1 (pt) 2022-01-04
BR112016015154A2 (enrdf_load_stackoverflow) 2017-08-08
EA033165B1 (ru) 2019-09-30
AU2015208858A1 (en) 2016-07-28
FR3016894A1 (fr) 2015-07-31
AU2015208858B2 (en) 2018-11-01
CN105934538A (zh) 2016-09-07
EP3099844A4 (fr) 2017-11-22
EP3099844A1 (fr) 2016-12-07
CA2935676A1 (fr) 2015-07-30
MY179496A (en) 2020-11-09
US10513788B2 (en) 2019-12-24
DK201670538A1 (en) 2016-09-05
WO2015110904A1 (fr) 2015-07-30
US20160326661A1 (en) 2016-11-10
EA201691527A1 (ru) 2016-12-30
AR099184A1 (es) 2016-07-06
DK179941B1 (en) 2019-10-16
FR3016894B1 (fr) 2017-09-01

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