EP4174216A1 - Schutzvorrichtung für anoden einer elektrolytischen zelle mit beweglichen platten und verfahren zur durchführung des verfahrens - Google Patents

Schutzvorrichtung für anoden einer elektrolytischen zelle mit beweglichen platten und verfahren zur durchführung des verfahrens Download PDF

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Publication number
EP4174216A1
EP4174216A1 EP21204982.9A EP21204982A EP4174216A1 EP 4174216 A1 EP4174216 A1 EP 4174216A1 EP 21204982 A EP21204982 A EP 21204982A EP 4174216 A1 EP4174216 A1 EP 4174216A1
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EP
European Patent Office
Prior art keywords
panel
panels
protection device
anodes
anode
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.)
Withdrawn
Application number
EP21204982.9A
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English (en)
French (fr)
Inventor
Nazeer Ahamad Basha KASIM
Pragneshkumar Narendrabhai CHAUHAN
Venugopal Ashok SARANG
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.)
Dubai Aluminium PJSC
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Dubai Aluminium PJSC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Dubai Aluminium PJSC filed Critical Dubai Aluminium PJSC
Priority to EP21204982.9A priority Critical patent/EP4174216A1/de
Priority to PCT/IB2022/060142 priority patent/WO2023073520A1/en
Publication of EP4174216A1 publication Critical patent/EP4174216A1/de
Withdrawn legal-status Critical Current

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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
    • C25C3/22—Collecting emitted gases
    • 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

Definitions

  • the invention relates to the field of fused salt electrolysis, and more precisely to an anodic assembly which is part of an electrolytic cell suitable for the Hall-Heroult process.
  • the invention relates to a device which is adapted to protect the environment from the emission of anodes, which belong to this anode assembly.
  • the Hall-Heroult process is the only continuous industrial process for producing metallic aluminium from aluminium oxide.
  • Aluminium oxide Al 2 O 3
  • molten cryolite Na 3 AlF 6
  • the resulting mixture typically at a temperature comprised between 940 °C and 970 °C
  • acts as a liquid electrolyte (usually called "electrolytic bath") in an electrolytic cell.
  • An electrolytic cell also called “pot" used for the Hall-Héroult process typically comprises a steel shell (so-called potshell), a lining (comprising refractory bricks protecting said steel potshell against heat, and cathode blocks usually made from graphite, anthracite or a mixture of both).
  • This cell is also provided with so-called anodic assemblies, which are formed by an anode hanger and at least one anode (usually made from carbon) that plunges into the liquid electrolyte.
  • Anodes and cathodes are connected to external busbars.
  • An electrical current is passed through the cell (typically at a voltage between 3.5 V and 5 V) which electrochemically reduces the aluminium oxide, split by the electrolyte into aluminium and oxygen ions, into aluminium at the cathode and oxygen at the anode; said oxygen reacting with the carbon of the anode to form carbon dioxide.
  • the resulting metallic aluminium is not miscible with the liquid electrolyte, has a higher density than the liquid electrolyte and will thus accumulate as a liquid metal pad on the cathode surface from where it needs to be removed from time to time, usually by suction into a crucible.
  • Industrial electrolytic cells used for the Hall-Heroult process are generally rectangular in shape and connected electrically in series, the ends of the series being connected to the positive and negative poles of an electrical rectification and control substation.
  • the general outline of these cells is known to a person skilled in the art and will not be repeated here in detail. They have a length usually comprised between 8 and 25 meters and a width usually comprised between 3 and 5 meters.
  • the cells also called “pots” are always operated in series of several tens (up to more than a hundred) pots (such a series being also called a "potline”); within each series DC currents flow from one cell to the neighbouring cell.
  • the cells are arranged in a building, with the cells arranged in rows either side-by-side, that is to say that the long side of each cell is perpendicular to the axis of the series, or end-to-end, that is to say that the long side of each cell is parallel to the axis of the series. It is customary to designate the sides for side-by-side cells (or ends for end-to end cells) of the cells by the terms "upstream” and "downstream” with reference to the current orientation in the series. The current enters the upstream and exits downstream of the cell.
  • the electrical currents in most modern electrolytic cells using the Hall-Héroult process exceed 200 kA and can reach 400 kA, 450 kA or even more; in these potlines the pots are arranged side by side. Most newly installed pots operate at a current comprised between about 350 kA and 600 kA, and more often in the order of 400 kA to 500 kA.
  • the superstructure of the cell comprises a fixed frame and a mobile metallic anode busbar, also called “anode beam", which extends at the outer periphery of the fixed frame.
  • Each anode is equipped with a metallic rod, for mechanical attachment and electrical connection to said anode beam.
  • Anodes are provided along at least one line, typically along two lines on either side of the superstructure.
  • anodes in the Hall-Heroult process are prebaked cuboids made from a carbonaceous material.
  • the anode blocks are fixedly connected to so-called anode hangers. They serve two different purposes, namely to keep the carbon anodes at a predetermined distance from the cathode, and to carry the electrical current from an anode busbar (also called “anode beam”) down to the carbon anodes.
  • Anode hangers are fixed to the overhanging anode beam in a detachable manner using clamps. They comprise an upper part called “anode rod” or “anode stem”, which is connected to the anode beam, and a lower part, called “anode yoke”.
  • the anode yoke has a number of arms each of which terminates in a cylindrical stub that is embedded in preformed stubholes of the carbon anode blocks and fixed with cast iron acting as temperature-resistant, electrically conductive glue; this process is called “anode rodding” or “anode casting”.
  • anode rod plus anode yoke is sometimes called “anode hanger”
  • anode hanger plus anode block is called “anode assembly”.
  • Anodes are subject to oxidative consumption during the electrolysis process, the carbon being oxidized into carbon dioxide. More generally, the Hall-Heroult electrolytic process leads to gaseous emissions, which, in addition to CO 2 , mainly comprise fluorine compounds such as hydrogen fluoride, originating from the electrolytic bath, as well as minor amounts of SO 2 . These fluorine compounds are noxious to workers and to the environment. Concerning environmental damage, it has been observed over the decades, as the production of smelters has increased, that fluorine compounds can damage the neighbouring vegetation, and can also cause damage (so-called fluorosis) to the cattle raised near aluminium smelters. Therefore, since the 1970s, gaseous emissions of Hall-Heroult cells are no longer released into the environment but undergo a purification.
  • fluorine compounds such as hydrogen fluoride
  • gaseous emissions from electrolytic pots are collected using protection devices such as hooding systems, and treated in gas treatment stations to remove fluorine compounds and other noxious compounds before releasing the collected air into the environment.
  • Said gas treatment usually comprises a dry absorption of said noxious compounds on fresh alumina that is subsequently introduced into the electrolytivc pot.
  • each protection (hooding) device is intended to cover at least one line of anodes.
  • this device comprises first an elongated frame which extends, in use, substantially parallel to the line of anodes.
  • This frame supports two fixed end walls, located at the opposite extremities of the anodes line.
  • several panels are provided between these end walls.
  • These panels are typically curved, in particular shaped as a quarter of a circle, so as to ensure an optimal protection.
  • Said hood panels also act as heat shields, thereby limiting thermal losses of the electrolytic cell and protecting the workers.
  • the panels need to be movable between two main configurations. In a first so-called protection configuration, these panels are located side by side to define a shield, with a close lateral contact for sealing matters. Moreover in a second so-called access configuration, these panels must be mutually separated so as to define a passage towards the anodes for the operators.
  • a typical industrial electrolytic pot (known as DX+ TM or DX+ Ultra TM technology, commercialized by Emirates Global Aluminium) has 18 anodes on each side, arranged along a longitudinal axis (called here also "anode line") of the cell, and there are 19 hood panels on each side.
  • anodes are changed by pairs, and for changing a pair of anodes three adjacent hoods need to be removed to gain access to the pair of anodes to be changed; eventually these three hood panels need to be put back in place.
  • hood panels can be removed from the frame by lifting. Such a lifting operation may first be carried out manually. In this case, there are risks of premature mechanical damage of the panels, due to potential mishandling of the operators. In practice, these hoods need to be replaced when they exhibit a deformation such that they do no longer guarantee sufficient tightness. Repair and replacement of hood panels represent a rather significant cost in a smelting plant. Moreover, due to the substantial weight of the panels (typically around 17 kg per panel for DX+ TM or DX+ Ultra TM technology), their manual handling by an operator may cause injuries. As these panels are also very hot, their manual handling may lead to accidental burns, too.
  • one goal of the invention is first to provide a device adapted to reliably protect environment from the emissions of the anodes of an electrolytic cell, which can be implemented by operators without any excessive physical strength.
  • One other goal of the invention is to provide such a device which can bring about an improved sealing, in particular with respect to gaseous emissions of the anodes, compared to prior art solutions.
  • One other goal of the invention is to provide such a device, which has a relatively simple structure and a satisfactory compactness.
  • a protection device (100) for an anodic assembly of an electrolytic cell suitable for the Hall-Héroult electrolysis process, said assembly comprising a superstructure (102) as well as a plurality of anodes (A1-A8) arranged along at least one line (L1, L2), said superstructure (102) comprising a fixed frame (104) of substantially rectangular shape and an anode beam (106) adapted to support anode rods (108),
  • Another object of the invention is an electrolytic cell suitable for the Hall-Heroult electrolysis process, comprising a protection device (100) as above.
  • Another object of the invention is a method for changing a spent anode assembly in an electrolytic cell as above, comprising the steps of:
  • Another object of the invention is an aluminium electrolysis plant comprising at least one line of electrolytic cells of substantially rectangular shape, said cells being arranged side by side, and said plant further comprising means for electrically connecting said cells in series and for connecting the cathodic busbar of a cell to the anode beam of a downstream cell, characterized in that more than 80% of the electrolytic cells in at least one of said line, and preferably each electrolytic cell of said line, is an electrolytic cell as above.
  • Another object of the invention is a method for making aluminium by the Hall-Heroult electrolysis process using electrolytic cells of substantially rectangular shape, characterized in that said method is carried out in an aluminium electrolysis plant as above.
  • An aluminium smelter comprises a plurality of electrolytic cells arranged the one behind the other (and side by side), typically along two parallel lines. These cells are electrically connected in series by means of conductors, so that electrolysis current passes from one cell to the next.
  • the number of cells in a series is typically comprised between several tens up to more than four hundred, but this figure is not substantial for the present invention.
  • the cells are arranged transversally in reference of main direction of the line they constitute. In other words the main dimension, or length, of each cell is substantially orthogonal to the main direction of a respective line, i.e. the circulation direction of current.
  • an electrolytic cell used for the Hall-Heroult process typically comprises first a potshell and a lining, which are not illustrated on the figures.
  • This cell also comprises a plurality of anode assemblies, each of which is formed by a metallic rod (so-called “anode rod”) and at least one anode fixed to it by means of an anode yoke.
  • This anodic assembly known as such, is not part of the invention, so that it will not be described in detail.
  • superstructure 102 comprises a fixed frame 104 and a mobile metallic anode frame 106 , hereafter called “anode beam", which extends at the outer periphery of the fixed frame.
  • each anode is provided with a metallic anode rod 108 for mechanical attachment and electrical connection to the anode beam.
  • These anodes are not shown on figure 1 , but their positioning is illustrated in particular on figure 4 .
  • anode beam 106 is provided with pairs of hooks 110 , adapted to facilitate the attachment of the anode rods 108 to the anode beam 106 in the usual way.
  • Two lines L1 and L2 are provided, on either side of superstructure 102 .
  • Hall-Heroult electrolysis pot The general structure of a Hall-Heroult electrolysis pot is known per se and will not be explained here. It is sufficient to explain that the current is fed into the anode beam, flows from the anode beam to the plurality of anode rods and to the anodes in contact with the liquid electrolyte where the electrolytic reaction takes place. Then the current crosses the liquid metal pad resulting from the process and eventually will be collected at the cathode block.
  • the present invention is more particularly directed to a protection device 100 , which is adapted to cooperate with one anode line.
  • a protection device 100 which is adapted to cooperate with one anode line.
  • two such devices referenced I and II as a whole, cooperate with respective anodes lines L1 and L2.
  • Each of said devices forms a hood which separates the content of the electrolytic cell, as well as any off-gases generated by the electrolysis process, from the environmental atmosphere. Said off-gases are sucked through the superstructure into a gas treatment station, as mentioned above; this is known as such and will not be explained here in more detail.
  • Device I will now be described, bearing in mind that the structure of device II is similar.
  • Said device of the invention comprises an elongated frame 1 , which includes longitudinal beams 10 , 11 and 12 . Respective inner and outer beams 10 and 11 are positioned at the bottom of the frame, whereas upper beam 12 is positioned substantially above central beam 10 .
  • Longitudinal beams 10 and 11 are mutually linked by horizontal cross pieces, namely a middle cross piece 13 as well as two opposite cross pieces 14 and 15 .
  • longitudinal beams 10 and 12 are mutually linked by vertical posts, namely a middle post 16 as well as two opposite end posts 17 and 18.
  • Several oblique bars 19 are also provided, so as to stiffen this frame.
  • two plain walls 20 and 21 each having substantially the shape of a quarter of a disc, are fixed at the opposite ends of said longitudinal beams 10 , 11 and 12 .
  • longitudinal beam 10 supports two mutually parallel brackets 22 and 23 , each being V shaped and positioned side-by-side.
  • the upper surface of these brackets defines respective inner and outer tracks 24 and 25 .
  • upper beam 12 is equipped with two further parallel brackets 26 and 27 , schematically illustrated on figure 7 , which are positioned the one under the other.
  • the outer surface of these brackets defines further respective lower and upper tracks 28 and 29 , also schematically illustrated.
  • these different tracks are adapted to cooperate with sliders, provided on panels which are part of the device I.
  • the device I comprises two sets of panels, namely a first set of inner panels 3 , as well as a second set of outer panels 7 .
  • the two sets comprise the same number, namely four inner panels 3a to 3d and four outer panels 6a to 6d in the illustrated example (see in particular figure 3 ).
  • a different number of panel can be considered.
  • Panel 3 comprises an inner skin 31 and an outer skin 32 , which are mutually distant over part of the panel, so that the latter partly forms a hollow body.
  • inner skin may be a stainless steel sheet
  • outer skin may be a sheet of aluminium. This stainless steel sheet is adapted to be exposed to flames and high temperatures, while also reinforcing the aluminium sheet.
  • said skins are separated on longitudinal ends of the panel, so as to define longitudinal walls 33 and 34.
  • outer skin 32 is designed to form some recesses, namely regions where this skin 32 extends close to inner skin 31 .
  • outer skin 32 is first equipped with so-called long recesses, namely which extend over substantially its whole length : an inner recess 320 , an opposite outer recess 321 and an intermediate recess 322 .
  • three further so-called recesses are provided side-by-side, between long recesses 323 and 324 : end recesses 325 and 326 , as well as a median recess 327 .
  • U shaped elements 41 and 43 are fixed on the inner and outer edges of each recess 325 and 326 . These U shaped elements form handles, which enable operators to move the panel, as will be described hereafter. Since these handles are positioned in recesses, they do not protrude outside the global surface of outer skin, as shown on figure 10 .
  • the two skins 31 and 32 contact each other and are mutually fixed by any appropriate means, such as rivets.
  • any appropriate means such as rivets.
  • skins are mutually fixed by a longitudinal line 330 of rivets.
  • a rim 34 is interposed between these skins, so as to protrude outside with respect to these skins. This rim extends substantially over the whole length of the panel, namely along XX axis.
  • the panel 3 is equipped with some outside rollers 36 , which form sliders.
  • the shape of each roller is designed so as to cooperate with the above described inner track 24 .
  • said roller is provided with a V-shaped groove 37 .
  • two rollers are provided close to opposite longitudinal ends of the panel, bearing in mind that a superior number of rollers may be provided.
  • one single roller may be considered: however this is not a preferred variant, due to its lack of stability.
  • roller 36 The attachment of the roller on the skins is achieved by a fixing piece 38 , which is substantially S shaped. This latter is attached on the inner skin by one of the above described rivet 330 , as well as a further rivet 331 .
  • a physical axis 40 is mounted on facing walls of rim 34 and piece 38 , with interposition of a U shaped element 42 . This makes it possible to rotate roller 36 around a geometric axis A36, which extends along transverse axis YY.
  • a housing 44 is attached on the inner wall of rim 34 , in particular by welding.
  • a locking rod 46 is slidably mounted in this housing, through opposite top 440 and bottom 442 walls thereof.
  • a horizontal pin 47 protruding from said rod, is adapted to slide along a vertical notch 444 in the housing.
  • a compression spring 48 is wrapped around rod 46 , so as to push said rod downwards, until pin 47 abuts against bottom wall of notch 444 .
  • a ring 49 allows activation by an operator, so that the latter may pull rod 46 upwards, against compression action of the spring 48 .
  • locking rod 46 is adapted to engage a so-called locking hole 112 , provided in the upper face of longitudinal beam 11 as shown by figure 27 .
  • the inner longitudinal side of skins 31 and 32 are mutually fixed by a supplementary line 335 of rivets. As shown more in detail on figure 16 , some of these rivets 335 ensure the attachment of a further slider 50 , which is adapted to cooperate with the lower track 28 . To this end, slider 50 is accommodated in a housing 35 , which is mounted on the ends of skins 31 and 32 . Moreover member 351 is intended to reinforcement purpose, whereas 352 denotes a structural frame module, for holding the slider tip 51 .
  • each outer panel 6 is to be compared with that of each inner panel 3 , as above described.
  • said outer panel is formed by an inner skin 61 and an outer skin 62.
  • outer panel 6 has substantially the same curved shape as inner panel 3 . Due to its position outside panel 3 , said outer panel 6 has a slightly superior radius of curvature. In use, the two panels 3 and 6 are positioned in close proximity, so as to strengthen the sealing effect.
  • D36 the closest distance between outer skin 32 of inner panel 3 and inner skin 61 of outer panel 6 .
  • this distance D36 is very little, in particular inferior to the thickness of hollow bodies.
  • Figures 18 to 20 , as well as 22 to 26 show structural elements of panel 6 , that are substantially identical to those of panel 3 , which are illustrated on figures 8 to 10 , as well as 12 to 16.
  • panel 6 is provided with several recesses, similar to those of panel 3 .
  • Panel 6 is also equipped with a rim 64 , identical to that 34 (see figure 22 ).
  • panel 6 comprises rollers 66 , analogous to those 36 .
  • the inner wall of said rim 64 is provided with a housing 74 , adapted to cooperate with a locking rod 76 (see figure 24 ).
  • panel 6 is equipped with a slider 80 .
  • several lines of rivets 630 to 635 are also provided in several locations of panel 6 , in a similar way as rivets 330 to 335 of panel 3 .
  • the protection device is in its closing configuration illustrated in particular on figure 4 .
  • the different panels define a sort of shield in front of the side-by-side anodes. More in detail, inner panels 3a and 3b are in mutual contact, while panel 3a abuts against wall 21.
  • outer panels 6a and 6b are in mutual contact, while panel 6a advantageously overlaps panel 3b.
  • outer panels 6c and 6d are in mutual contact, while panel 6d abuts against opposite wall 20, and inner panels 3c and 3d are in mutual contact.
  • outer panel 6c overlaps inner panel 3d whereas, on the other hand, outer panel 6b of overlaps inner panel 3c.
  • These different overlap zones which are referenced OV on figure 4 , advantageously have a length ensuring a thermal insulation effect.
  • locking rod 46 extends into facing hole 112: this cooperation between rod and hole applies at least for some of the above panels.
  • the operator will move at least panel 6a which is initially located in front of target anode A3. To this end, he first pulls upwards ring 49, so as to disengage rod 46 out of initial hole 112 (see arrow F49 on figure 27 ). Under these circumstances, panel 6a can then be pushed manually by the operator using handles 71 and 73. More in detail this panel will slide with respect to the frame due to the cooperation, first between rollers 36 66 and tracks 25 24, in addition between sliders 50 80 and tracks 28 29. During this sliding motion.
  • panel 6a is pushed towards the left according to arrow F6a, bearing in mind that it may be pushed towards the right according to arrow f6a.
  • this outer panel is maintained in position, since spring 48 pushes locking rod 46 into another hole, located at the left with respect to the above mentioned initial hole (see arrow F48 on figure 27 ).
  • Said panel 6a extends now in front of inner panel 3b namely, in other words, the latter is retracted behind this outer panel.
  • the width of the above passage P3 may not be sufficient.
  • the operator pushes, not only panel 6a as described above, but also adjacent panel 6b. As shown on figure 29 , it is in general more convenient to slide this adjacent panel 6b towards the right along arrow F6b, namely away from panel 6a. At the end of these two motions, panels 6a and 6b are located in front of respectively inner panels 3b and 3c.
  • both panels 6a and 6b may be displaced towards the left, so as to cover inner panels 3a and 3b in view of the creation of passage P'3.
  • only single panel 6b may be displaced so as to create a narrow passage, analogous to P3.
  • steps analogous to those of the last two paragraphs may be carried out, in case of interventions on either anodes A7 or A8.
  • the width of the above passage P2 may not be sufficient.
  • the operator needs to push towards the right, not only panel 3a as described above, but also adjacent panel 3b.
  • both outer panels 6a and 6b need to be moved in a preliminary step, so that the operators might easily displace above mentioned inner panels.
  • These different motions illustrated on figure 31 by arrows F6a, F6b for outer panels, and by arrows F3a and F3b for inner panels, have a greater amplitude than motions of figure 30 .
  • panels 3a and 3b are away from extremity wall 21, so as to create a larger passage P'2 towards anode A2. It is to be noted that this large passage also enables access to adjacent anode A1. In case of an intervention on this anode A1, it is also possible to move towards the right panel 3a, from the configuration illustrated in figure 30 . Moreover steps analogous to those described in the last two paragraphs may be carried out, in case of interventions on either anodes A5 or A6. In this last situation, it is preferred to move towards the left, first the outer panels 6a and 6b, and then the inner panels 3c and 3d.
  • FIGS 33 to 36 illustrate other possibilities, for what concerns access configurations of the device according to the invention. These figures represent the basic elements of the frame, as well as the different panels.
  • panel 3c is retracted behind panel 6b, so as to create a narrow passage P5, similar to P2 and P3, towards not shown anode A5.
  • panels 3c and 3d are retracted behind respective panels 6b and 6c, so as to create a wider passage P'5, similar to P'2 and P'3.
  • panels 3a to 3c are retracted behind respective panels 6a to 6c, so as to create a still wider passage P7.
  • figure 36 all the inner panels 3a to 3d are retracted behind outer panels 6a to 6d, so as to create a maximal width passage P8.
  • the device according to the invention can be made in various other embodiments.
  • eight hood panels are provided on each side.
  • the hooding device according to the present invention advantageously comprises approximately ten hood panels on each side. It is to be compared to the conventional hooding devices of a DX+ TM or DX+ Ultra TM electrolytic pot, which comprise 19 hood panels on each side.
  • the device according to the invention has many advantages over prior art devices. Operator work is easier and safer, with less effort being required to slide the hood panels instead of removing them, reducing the risk of back injuries. Moreover, sliding hood panels are less subject to mishandling and damage than prior art panels. Sliding one or two hood panels for an anode change or other purpose requiring access to the anodes reduces emission of noxious gases into the potroom, as there is no need to slide the hood panel totally if convenient access is possible with a partially slid panel.
  • the device according to the invention can be used in a process for changing a spent anode assembly, comprising the steps of
  • This process can be carried out manually, or it can be carried using a pot tending machine; the sliding facility of the hood panel simplifies the operation of said pot tending machine for opening and closing the access to the anode assembly.

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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)
EP21204982.9A 2021-10-27 2021-10-27 Schutzvorrichtung für anoden einer elektrolytischen zelle mit beweglichen platten und verfahren zur durchführung des verfahrens Withdrawn EP4174216A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP21204982.9A EP4174216A1 (de) 2021-10-27 2021-10-27 Schutzvorrichtung für anoden einer elektrolytischen zelle mit beweglichen platten und verfahren zur durchführung des verfahrens
PCT/IB2022/060142 WO2023073520A1 (en) 2021-10-27 2022-10-21 Protection device for anodes of an electrolytic cell, comprising movable panels, and its implementation method

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EP21204982.9A EP4174216A1 (de) 2021-10-27 2021-10-27 Schutzvorrichtung für anoden einer elektrolytischen zelle mit beweglichen platten und verfahren zur durchführung des verfahrens

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EP4174216A1 true EP4174216A1 (de) 2023-05-03

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DE102011052543A1 (de) * 2010-08-10 2012-02-16 Solios Environnement Verfahren und Vorrichtung zum Einschliessen der Wannengase in einer Aluminiumelektrolysewanne
WO2015132479A2 (fr) 2014-03-05 2015-09-11 E.C.L. Système pour la réalisation d'opérations liées à l'exploitation de cellules d'une installation de production d'aluminium par électrolyse
AU2015208857A1 (en) * 2014-01-27 2016-07-28 Rio Tinto Alcan International Limited Hooding system for an electrolytic cell

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