Classifications

• • 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
  • C25C7/00—Constructional parts, or assemblies thereof, of cells; Servicing or operating of cells
  • C25C7/007—Constructional parts, or assemblies thereof, of cells; Servicing or operating of cells of cells comprising at least a movable electrode
• • 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 present invention relates to an electrolysis cell, intended for the production of aluminum, and an electrolysis plant, in particular an aluminum smelter, comprising this electrolytic cell.
• an electrolytic cell conventionally comprising a steel box inside which is arranged a coating of refractory materials, a cathode of carbon material, crossed by cathode conductors for collecting the electrolysis current to the cathode to lead cathodic outputs through the bottom or sides of the box, routing conductors extending substantially horizontally to the next vessel from the cathode outlets, an electrolytic bath in which is dissolved 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 to which the anode assembly is suspended via the anode rod substantially vertical, the latter being movable with the anode frame relative to the box and the cathode, and con Electrolytic current rise drivers, extending from bottom to top, connected to the routing conductors of the preceding
• anode blocks are consumed during the electrolysis reaction, it is necessary to periodically replace the anode assemblies. Conventionally, the replacement of an anode assembly is performed on one side of the electrolytic cell.
• US3575827 discloses the replacement of an anode assembly by the top of the tank.
• the electrolysis tanks are arranged transversely to the length of the line they form.
• the electrolysis cells comprise an anode assembly with an anode conductor in the form of an electrically conductive, non-vertical but horizontal plate, to which an anode is suspended, the conductive plate being supplied with electrolysis current by electrodes. flexible electrical conductors connected to one side, upstream, of the anode assembly.
• the anode assembly can be extracted from the top of the tank.
• the heat flux extracted by the anode conductors on the upstream side of the tank would introduce a significant thermal imbalance between the two sides of the tank, making it difficult to control the electrolysis process and greatly reducing the service life of the tank.
• the present invention aims to remedy all or part of these disadvantages by providing an electrolytic cell for anodic assembly replacement from above while maintaining a high efficiency.
• the subject of the present invention is an electrolysis cell, intended for the production of aluminum by electrolysis, in which the electrolytic cell comprises a box having two opposite longitudinal sides, an anode assembly, movable only in translation. vertical relative to the box, the anode assembly comprising at least one anode block and a transverse anodic support extending substantially transversely to the longitudinal sides of the box and to which said at least one anode block is suspended, the transverse anodic support comprising two connecting portions from which is intended to be fed the transverse anode support electrolysis current, the electrolysis cell further comprising electrical connection conductors electrically connected to the two connecting portions of the transverse anodic support, characterized in that the two portions of connection are distant according to a di substantially transverse rection of the electrolytic cell.
• the electrolytic cell according to the invention advantageously allows a lightening of the anode assembly and a minimization of its size which brings a saving of raw material on the anode assembly but also on peripheral structural equipment.
• the lightening and compactness of the anode assembly makes it possible to envisage the use of means for moving anodic assemblies of reduced dimensions, and therefore less expensive.
• the lightening of the anode assembly also makes it possible in practice to consider more easily an overall anode assembly from above, that is to say by vertical upward traction of the anode assembly.
• An anodic assembly replacement from above advantageously makes it possible to free the space between the tanks, either to facilitate the operations, or to bring the tanks closer together to align more tanks in the same space or the same number. tanks in a smaller space.
• the two opposite longitudinal sides are substantially symmetrical with respect to a longitudinal median plane of the electrolytic cell, and the two connection portions are arranged on either side of said plane.
• the transverse anodic support comprises two end portions, and the connection portions are disposed on these end portions.
• the anode support comprises a first structure, made of a first electrically conductive material, and a second structure, a second electrically conductive material, the second material having an electrical conductivity substantially greater than that of the first material.
• the anodic support offers a combination of a material having a high electrical conductivity, to ensure the electrical conductivity and to reduce the energy losses, and a material having a lower electrical conductivity, but serving as a strong and rigid carrier structure for mechanically supporting a plurality of anode blocks, despite the exposure of this carrier structure to high temperatures of up to about 1000 ° C.
• the use of such a composite anodic support makes it possible to reduce the quantity and the cost of the raw materials necessary so that the anodic support can ensure the two functions of transporting electric current and supporting the anode blocks.
• the first material is more particularly steel for its low cost and its high mechanical strength, also at high temperature.
• the second material is more particularly copper for its very high electrical conductivity, but also its ability to deform and its interesting properties as a contact surface for an electrical connection.
• Anodic support in copper alone would deform under the weight of the anode blocks, more particularly because of the high temperatures in the tank. Also, an anode support in steel alone would have a very large footprint to ensure proper conduction of the electrolysis current to the anode blocks, despite the improvements mentioned above provided by the present invention.
• the second structure is attached to the first structure so that the first structure mechanically supports the second structure.
• This attachment can be achieved for example by bolting, welding or molding of one of the materials in a skeleton formed by the other material, including a copper molding in a steel skeleton.
• the first structure comprises a transverse bar extending substantially transversely from one connecting portion to the other connecting portion.
• Such a bar is less sensitive to the thermal radiation generated by the electrolytic bath than a plate of equivalent section disposed horizontally and the surrounding air also circulates better around.
• a bar is also mechanically more suitable for supporting heavy loads.
• the bar extends in one piece between the connection portions.
• each longitudinal bar is monobloc and corresponds to one and the same mechanical part extending from one connecting portion to the other.
• connection portions are arranged on the ends of the longitudinal bar and are more particularly located near the longitudinal sides of the box.
• the second structure at least partially forms the connection portions of the anode carrier.
• the electrical connection of the anode assembly with the electrical connection conductors of the tank is performed by means of the second structure formed with a material having good electrical conductivity.
• the voltage drops are then minimized for transporting the electrolysis current to the anode blocks.
• the second structure comprises two distinct parts each forming at least partially one of the two connection portions.
• the second structure of better electrical conductivity it is not necessary for the second structure of better electrical conductivity to be continuous from one connecting portion to the other of the anodic support, since this second structure serves to supply the anode blocks with electrical power and would therefore hardly be traversed by an electric current over its entire length because it is supplied with electrolysis current at two distinct points distant in a substantially transverse direction of the vessel, in particular at two opposite ends of the anode carrier, on each side of the vessel .
• This discontinuity, or separation of the second structure into two distinct parts makes it possible to minimize the quantity of second material used, this second material conventionally having a high cost.
• the two opposite longitudinal sides of the vessel are substantially symmetrical with respect to a longitudinal median plane of the electrolysis vessel, and the two distinct parts are arranged on either side of the plane (P).
• the electrolysis current flowing through each of the two distinct parts is then of substantially identical intensity but of opposite direction in the anodic support so that the electrical balance in the support is made in the center of the anode support.
• the two distinct parts are advantageously substantially symmetrical with respect to said plane.
• the anode assemblies may therefore have a symmetry with respect to a median plane so that the anode assemblies can be inserted into the vessel without there being a predetermined direction to be respected.
• the transverse anodic support comprises a plurality of logs fixed on the first structure and intended to be sealed in recesses formed in a surface of said at least one anode block, and the distance in the transverse direction between the two distinct parts is substantially equivalent to the distance between two adjacent logs.
• an area in which the current flows in the anode carrier can be made between two logs so that this configuration allows a significant saving of second material for form the second structure.
• the transverse anodic support comprises a plurality of logs fixed on the first structure and each part is fixed to the first structure only at the level of the fixing of the logs and a connecting portion.
• This fixing of the second structure on the first structure may for example be performed by welding or bolting.
• Each log can therefore be perfectly electrically powered by the portion of the second structure which extends from the corresponding connecting portion to the fixing end of the log on the first structure which is the supporting structure. Also, this way of fixing the second structure on the first structure allows the first structure to be able to expand independently of the second structure so that the temperature changes experienced by the anodic support during its lifetime do not degrade it. More particularly, taking the case of steel as the first material and copper as the second material, the first material will expand less than the second material when exposed to heat, and the second material, more flexible than the first material, which must be rigid to form the carrier structure, may be slightly deformed along the first structure between two attachment points.
• the anode assembly comprises two adjacent anode blocks in a transverse direction of the electrolytic cell, the two anode blocks being supported by the same first structure and arranged in two distinct parts of the second structure.
• the current electrolysis tanks are of large width so that it is advantageous to use two anode blocks across the width of the tank, so hooked to the same anode assembly to facilitate the evacuation of gas accumulating under the blocks anodic, manufacture and handling of anodic blocks.
• the anodic support forms a ring delimited by two transverse bars connected to one another at their ends, the bars extending substantially parallel to each other and perpendicular to the longitudinal sides of the box.
• the annular shape of the anodic support makes it possible to save raw material and lightening compared to an anodic support formed of a single bar or a plate that would cover the same overall area in a horizontal plane as the ring thus formed. for mechanical strength and equivalent electrical conductivity.
• This annular shape makes it possible in particular to minimize the total lengths of electrical conductors from the connection portions to the anode blocks.
• the annular shape makes it possible to minimize the warping or deformations of the anode supports in twisting because of the successive expansions experienced by the anode supports.
• the annular or parallel multi-bar form also offers the possibility of expanding the anode assemblies by minimizing material cost.
• the fact of having wide anode assemblies, in particular with two adjacent anode blocks in the direction of the length of the electrolytic cell, makes it possible to reduce the number of displacement means or lifting structure in the vertical direction of the anode assemblies, in particular to reduce the number of cylinders, and the number of electrical connections with electrical connection conductors.
• the anode assembly advantageously comprises two adjacent anode blocks in a longitudinal direction of the electrolytic cell, each anode block being supported by a separate transverse bar.
• No bar extends above the space between the two adjacent anode blocks in the longitudinal direction of the vessel so that the heat radiated by the bath between these anode blocks does not impact the strength and conductivity of the supports. anodic. Also, the bars do not interfere with the overflow of cover material between these adjacent anode blocks.
• the logs connecting the anode support to the anode blocks advantageously extend substantially vertically under each bar.
• this allows a saving of material, in comparison with logs having crosspieces and multidirectional spars supporting a plurality of feet sealed in an anode block.
• the first structure forms a ring and the second structure is arranged inside the ring formed by the first structure.
• the first structure is located vertically above the logs while the second structure is offset on the inside of the ring relative to to the axis along which the logs extend; the second structure is not in continuity with this axis but its length is minimized because it is positioned on the inside of the ring.
• the second material forming the second structure is protected by the first structure surrounding it, against damage due to strong thermal radiation generated by removal of an adjacent anode assembly of the electrolytic bath, against projections of corrosive materials, and against possible shocks when handling the anodic support alone or anode assemblies comprising such anodic support.
• the ring has U-shaped ends
• the second structure comprises two parts each having a corresponding U shape complementary to that of the ends of the ring, and, at ambient temperature, the length of the outer peripheral wall of curvilinear portions of the U formed by each portion of the second structure (220) is less than the length of the inner peripheral wall of the curvilinear portions of the U formed by the corresponding end of the ring
• the anode assembly comprises a plurality of logs extending between the anode carrier and the at least one anode block and in that the anode carrier comprises a portion bent in a vertical plane at each of its ends so that the portions connection of the anodic support are arranged above the upper surface of the logs.
• the anode assembly comprises a plurality of logs extending substantially vertically between the anode carrier and the at least one anode block, and in that the log has a substantially horizontal sealing end sealed inside the anode block.
• the anodic support comprises at least one reinforcing beam extending in a substantially transverse direction of the electrolytic cell and connecting the two ends of the anode carrier.
• This characteristic makes it possible to mechanically reinforce the anodic support and to limit the flexion or deformation of the latter.
• the anode support comprises a cross member extending in a longitudinal direction of the electrolytic cell and connecting the two longitudinal bars together and optionally with said at least one reinforcing beam.
• Longerons and sleepers can serve as gripping means for anode assemblies for their handling.
• the anode assembly comprises two adjacent anode blocks in a longitudinal direction of the electrolytic cell, each anode block being supported by a separate longitudinal bar.
• the invention relates to an electrolysis plant, in particular an aluminum smelter, comprising an electrolysis tank having the aforementioned characteristics, in which the electrolysis tanks are arranged transversely with respect to the length of the line.
• FIG. 1 is a schematic sectional side view of an electrolytic cell according to one embodiment of the invention
• FIG. 2 is a schematic sectional side view of an electrolytic cell according to one embodiment of the invention.
• FIG. 3 is a schematic side view of an anode assembly of an electrolytic cell according to one embodiment of the invention.
• FIG. 4 is a view from above of the anode assembly of FIG. 3,
• FIG. 5 is a sectional view along the line 1-1 of FIG. 3, on the side on which is represented an anode assembly,
• FIG. 6 is a schematic side view of an anode assembly of an electrolytic cell according to one embodiment of the invention.
• FIG. 7 is a view from above of the anode assembly of FIG. 6,
• FIG. 8 is a sectional view along the line 11-11 of FIG. 6;
• FIG. 9 is a schematic sectional side view of an anode assembly of an electrolytic cell according to one embodiment of the invention.
• FIG. 10 is a schematic view from above of an anode assembly of an electrolytic cell according to one embodiment of the invention.
• FIG. 11 is a schematic side sectional view along the line III-III of FIG. 10,
• FIG. 12 is a schematic view from above of an anode assembly of an electrolytic cell according to one embodiment of the invention.
• FIG. 13 is a schematic side sectional view along the line IV-IV of FIG. 12,
• Figure 14 is a schematic perspective view of an anode assembly of Figures 12 and 13;
• FIG. 15 is a schematic view from above of an anode assembly of an electrolytic cell according to one embodiment of the invention.
• FIG. 1 shows electrolysis tanks 1 according to one embodiment of the invention, intended for the production of aluminum by electrolysis.
• the electrolysis tanks 1 comprise a box 2, in particular made of steel, inside which is arranged a coating 4 of refractory materials, a cathode 6 made of carbon material, crossed by cathode conductors 8 for collecting the electrolysis current. at the cathode 6 to lead to cathode outlets through the bottom or sides of the box 2, conductors 12 extending substantially horizontally to the next electrolysis tank 1 from the cathode outlets , an electrolytic bath in which the alumina is dissolved, and a sheet 16 of liquid metal, in particular of liquid aluminum, forming during the electrolysis reaction.
• the casing 2 may have a substantially parallelepiped shape. It comprises two opposite longitudinal sides 18, substantially symmetrical with respect to a longitudinal median plane P of the electrolysis tank 1.
• the box 2 may have two transverse sides connecting the longitudinal sides substantially delimiting a rectangle.
• Longitudinal median plane means plane substantially perpendicular to a transverse direction X of the electrolysis tank 1 and separating the electrolysis tank 1 into two substantially equal parts.
• the electrolysis tank 1 is arranged transversely with respect to the length of a row of electrolysis cells.
• the electrolysis tank 1 extends in length in a longitudinal direction Y which is substantially perpendicular to the direction X in which extends the row of electrolysis cells whose electrolysis cell 1 part.
• the electrolysis tank 1 also comprises an anode assembly.
• the anode assembly comprises one or more anodic blocks 100 and a transverse anodic support 200, elongated transversely with respect to the length of the electrolysis tank 1, to which the anode block or blocks 100 are suspended.
• the anodic blocks 100 are more particularly made of carbon material of the pre-cooked type, that is to say cooked before introduction into the electrolysis tank 1.
• the anode assembly is movable only in translation, in particular in vertical translation, relative to the vessel 2. Also, the electrolysis vessel 1 is configured to allow an anode assembly change from above, as shown in FIG. 1 for the tank 1 located on the right of FIG.
• the transverse anodic support 200 extends substantially orthogonal to the longitudinal sides 18 of the box 2. In other words, the transverse anodic support 200 extends in a substantially transverse direction X of the electrolysis tank 1.
• the transverse anodic support 200 comprises two connecting portions 202. It is from these connecting portions 202 that the anodic support 200 is supplied with electrolysis current.
• the electrolysis tank 1 further comprises electrical connection leads, electrically connected to the two connection portions 202 for conducting the electrolysis current to the anodic support 200.
• the electrical connecting conductors extend substantially vertically along each longitudinal side of the casing 2.
• connection portions 202 are arranged on either side of the plane P, so that the anodic support 200 has a bilateral connection.
• the two connecting portions 202 are separate and distant in a substantially transverse direction X of the electrolysis tank 1.
• the two connecting portions 202 may be arranged substantially symmetrically with respect to the plane P.
• connection portions 202 may be arranged near the longitudinal sides 18 of the box 2.
• they can be arranged substantially vertically above the longitudinal sides 18 of the box 2, or, more advantageously, they can not extend to the right of the box 2, that is to say that they can be arranged outside a volume obtained by vertical translation of a projected surface in a horizontal plane of the box 2.
• connection portions 202 are thus less exposed to the heat generated by the electrolytic bath in operation.
• the anodic support 200 has a ring shape. It comprises in particular two longitudinal bars 204, substantially parallel to each other, extending substantially orthogonal to the sides 18 longitudinals of the box 2, that is to say in a substantially transverse direction X of the electrolysis tank. Bars 204 are connected to each other at their ends.
• Each longitudinal bar 204 extends in one piece between its two ends. In other words, each longitudinal bar 204 corresponds to one and the same mechanical part extending from one of its ends to the other end.
• connection portions 202 are advantageously arranged at the ends of each of the longitudinal bars 204, therefore at the ends of the ring formed by the anodic support 200, so as to deport them as far as possible from the center of the tank 1 of electrolysis.
• the anodic support 200 may comprise a first structure 210, intended to ensure the mechanical strength of the anodic support 200, and a second structure 220, intended to ensure the transport of the electrolysis current from the portions. 202 of connection to the anode block or 100.
• the first structure 210 is made of a first electrically conductive material.
• the second structure 220 is a second electrically conductive material.
• the second material has an electrical conductivity substantially greater than that of the first material.
• the first structure 210 is steel
• the second structure 220 is copper
• the first material may correspond to steel
• the second material may correspond to copper
• the anodic support 200 thus corresponding to a steel / copper composite.
• the first structure 210 is formed by the longitudinal bars 204.
• the second structure 220 may be formed by additional copper bars, distinct longitudinal bars 204.
• the copper bars can follow the shape of the longitudinal bars 204.
• the second structure 220 is fixed to the first structure 210.
• the first structure 210 supports the second structure 220.
• the first structure 210 has an annular shape.
• the longitudinal bars 204 may be the same bar bent at their ends or separate bars fixed together at their ends.
• the copper conduction bars 222 forming the second structure 220 may also be folded to conform to the shape of the first structure 210.
• the electrical connecting conductors 20 may be connected to the second structure 220.
• the second structure 220 more particularly forms a soleplate 32 in each connection portion 202, the soleplate being intended to rest against a connection surface. of the associated electrical connection conductor.
• a connector 30 may be used to provide good electrical connection of the anodic support 200 by compressing the connection portion 202 (the soleplate) against the associated electrical connection lead (the connection surface).
• the second structure 220 is advantageously dissociated into two distinct portions 220a, 220b corresponding to two separate and distant conduction bars 222. Part of each of the conduction bars 222 forms at least part of one of the two connecting portions 202.
• the second structure 220 is arranged on one side of the bar 204 forming the first structure 210.
• the second structure 220 is arranged inside the ring formed by the first structure 210.
• the second structure is then shorter than if disposed on the outside of the ring and further protected by the surrounding first party.
• the ring formed by the first structure 210 has U-shaped ends and the two conduction bars 222 or portions 220a, 220b of the second structure 220 also have a U shape, complementary to that of the ends of the ring formed by the first structure 210.
• the length of the outer circumferential wall of the curvilinear portions of the U formed by each conduction bar 222 is less than the length of the inner peripheral wall of the curvilinear portions of the U formed by the corresponding end of the ring.
• the anode assembly comprises a plurality of logs 230 between the anodic support 200 and the anode block (s).
• Each log 230 includes a proximal end attached to an upper face of one or one of the anode blocks 100 and a distal end attached to the first structure 210 only.
• the proximal end may for example be welded to the first structure 210.
• An electrical connection can also be made by welding between the logs 230 and the second structure 220.
• Each log 230 may extend substantially rectilinearly between its proximal end and its distal end, as shown in FIG. 5.
• the second structure 220 is advantageously fixed on the first structure 210 only at the connection portions 202 and / or at the distal ends of the logs 230, as illustrated in FIGS. 10 and 12.
• the second structure 220 is for example riveted, bolted or welded to the first structure. According to the example of FIGS. 10 and 12, a plurality of fixing members 240 hold the second structure 220 fixed against the first structure 210.
• Each portion 220a, 220b supplies electrical power to the separate logs 230 and the parts are spaced in the substantially transverse direction of the electrolytic cell.
• the two parts 220a, 220b are more particularly distant from a distance corresponding to the spacing between the two logs 230 most in the center of the anode assembly and symmetrical with respect to the plane P.
• Each log 230 may comprise a single proximal end and a single distal end.
• the logs 230 may be devoid of sleepers or spar extending in a substantially horizontal plane.
• the proximal end may be integral with a bar 240 or substantially horizontal sealing plate extending transversely of the vessel and sealed within the anode block 100.
• Figure 15 shows another anode assembly in which such bar 240 or sealing plate extends longitudinally with respect to the vessel.
• the anodic support 200 advantageously comprises a portion 250 bent at each of its ends.
• the longitudinal bars 204 and, if appropriate, the conduction bars 222 can be folded to present a portion 250 bent in a vertical plane at each of their ends, so that the connection portions of the anodic support are disposed above of the upper surface of the logs.
• the distance between the anode carrier and the anode block can be reduced, and therefore the height of the logs. Logs of excessive height would lead to an increase in the potential drop, detrimental to the efficiency of the electrolysis cell, as well as to an increase in the length and the mass of conductive material forming the anodic support.
• the anodic support 200 may comprise at least one reinforcing beam 260 extending in a substantially transverse direction X of the electrolysis tank 1 and connecting the two ends of the support 200. anodic.
• the anodic support 200 may further comprise one or more cross members 270 extending in a substantially longitudinal direction Y of the electrolysis vessel 1.
• the cross member (s) 270 connect the two longitudinal bars 204 to each other
• These longitudinal members 260 and cross members 270 may also serve as attachment means for handling the anode assembly or the anode carrier.
• the anode assembly comprises two adjacent anode blocks 100a, 100b in a longitudinal direction Y of the electrolysis tank 1.
• Each anode block 100a, 100b is advantageously supported by a separate longitudinal bar 204.
• each log 230 may be arranged on a median line of the upper face of the corresponding anodic block 100.
• Each log 230 may for example extend in a substantially vertical direction only.
• the anode assembly comprises two adjacent anode blocks 100a, 100a 'or 100b, 100b' in a longitudinal direction Y of the electrolysis tank 1, and these two blocks 100a, 100a 'or 100b, 100b 'anodic are supported by the same longitudinal bar 204.
• the logs 230 can then extend obliquely, or at least have a horizontal component.
• the logs 230 connecting a single longitudinal bar 204 longitudinal two blocks 100a, 100b or 100a ', 100b' anode can be arranged in pairs.
• the two logs 230 of the same pair are aligned in a substantially longitudinal direction Y of the electrolysis tank 1.
• the two logs 230 of the same pair may extend in a plane substantially perpendicular to a substantially transverse direction X of the electrolysis tank 1.
• the invention relates to an electrolysis plant, in particular an aluminum smelter, comprising an electrolysis tank 1 as described above.

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• 2014
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