US20180023206A1 - An anode for use in an electrolysis process for production of aluminium in cells of hall-héroult type, and a method for making same - Google Patents

An anode for use in an electrolysis process for production of aluminium in cells of hall-héroult type, and a method for making same Download PDF

Info

Publication number
US20180023206A1
US20180023206A1 US15/548,840 US201615548840A US2018023206A1 US 20180023206 A1 US20180023206 A1 US 20180023206A1 US 201615548840 A US201615548840 A US 201615548840A US 2018023206 A1 US2018023206 A1 US 2018023206A1
Authority
US
United States
Prior art keywords
anode
block
accordance
rodding
plates
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.)
Abandoned
Application number
US15/548,840
Other languages
English (en)
Inventor
Jørund HOP
Inge Arild VEE
Grzegorz Stefanski
Anders LILLEBY
Hans KUEPPERS
Per Johnny TEIGEN
Vidar HJELLE
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.)
Norsk Hydro ASA
Original Assignee
Norsk Hydro ASA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Norsk Hydro ASA filed Critical Norsk Hydro ASA
Assigned to NORSK HYDRO ASA reassignment NORSK HYDRO ASA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: STEFANSKI, GRZEGORZ, HJELLE, VIDAR, HOP, JORUND, LILLEBY, ANDERS, TEIGEN, Per Johnny, KUEPPERS, HANS, VEE, INGE ARILD
Publication of US20180023206A1 publication Critical patent/US20180023206A1/en
Abandoned legal-status Critical Current

Links

Images

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
    • C25C3/12—Anodes
    • C25C3/125—Anodes based on carbon
    • 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

Definitions

  • the present invention relates to an anode and a method of making same.
  • the invention relates to pre-baked anodes for electrolytic production of aluminium in electrolysis cells of Hall-Héroult type.
  • pre-baked anodes are fixed to studs forming part of an anode hanger.
  • the carbon based anode block has pre-formed bores which allow the studs to be entered into them.
  • the fixation between the stud and the anode is performed by pouring melted cast-iron in the annular space between each individual stud and the corresponding bore in the anode.
  • the anode hanger further comprises an anode yoke with the studs, the anode yoke further being suspended by an anode rod which is attached to an anode beam in its upper part. Often there is a bimetallic connection between the anode rod and the yoke.
  • melted cast-iron has some implications with regards to investments, for instance ovens that can melt the cast-iron, and corresponding distribution and pouring system.
  • ovens that can melt the cast-iron, and corresponding distribution and pouring system.
  • the studs are in some technologies preheated.
  • a pre-baked anode is normally worn out after approx. 30 days in the cell due to the consumption of the carbon material it consists of. It then must be replaced.
  • the worn out anode (butts) is transported to a facility where the studs of the anode hanger is cleaned by removing rest material of the anode together with cast iron residues. Commonly, this is performed by the use of mechanical frapping tools.
  • U.S. Pat. No. 4,574,019 relates to a process for attaching two anode blocks to an anode suspension means comprising two spades or studs by the use of an adhesive mass.
  • the mass should be mechanical strong and have good electrical conducting properties at least at temperatures between 900° C. and 1000° C.
  • the adhesive mass can be a mixture of solids, a binder and a hardener.
  • the solids can be represented by metal powder such as iron, copper or aluminium.
  • the particle size of the metal should be 5 mm at most. This type of contact mass is further described in EP 0 027 534.
  • the anode voltage drop has been reduced further, due to novel designs of the yoke.
  • the yoke comprises at least two delta shaped suspension plates where their upper, central parts are attached at the lower part of an anode rod.
  • the lower part of the plates, the rodding plates, are attached in recesses formed in the upper part of a carbonaceous anode block, and can in one embodiment be rodded according to the same principles as that shown in EP 2242976 A1. That will say, by a combination where the electric conductive rodding material consists of conductive particles only and that the current lead and the body of calcinated carbonaceous material are connected by various mechanical fixation means.
  • the plates of the yoke may be of a clad or composite material, preferably similar to that of a sandwich structure, that further can reduce the voltage drop and also sustain a different thermal performance. Important advantages are that this may result in less heat losses and lower voltage drop. It may be possible to design the yoke in a manner that makes it ‘neutral’ with regard to the heat balance in the cell when replacing a commonly used yoke.
  • the yoke comprises a horizontally oriented suspension plate between the anode rod and the rodding plates.
  • this suspension plate can at least partly be of a clad or composite material, preferably similar to that of a sandwich structure, that further can reduce the voltage drop and also sustain a different thermal performance. It also allows for easier coverage with anode covering material (ACM), due to less protruding elements.
  • ACM anode covering material
  • the yoke according to the invention will have good mechanical properties and sustain excellent stability.
  • FIG. 1 discloses in perspective, a first embodiment of an anode hanger with yoke and anode rod
  • FIG. 2 discloses the anode hanger of FIG. 1 from one side
  • FIG. 3 discloses the anode hanger of FIG. 1 , seen in a frontal view
  • FIG. 4 discloses, an anode hanger as that of FIG. 3 assembled into a carbon anode block
  • FIG. 5 discloses an anode hanger assembled into a carbon anode block as that of FIG. 4 , seen from one side in a cross-sectional view
  • FIG. 6 discloses a top view of the anode hanger assembled into an a carbon anode as shown in FIG. 5 , seen from above,
  • FIG. 7 corresponds in part to an enlarged view of the encircled area as denoted by A in FIG. 6 ,
  • FIG. 8 discloses in part an enlarged view of the encircled area as denoted by B in FIG. 4 ,
  • FIG. 9 discloses a completed anode assembly, seen in perspective
  • FIG. 10 discloses an alternative design of a mechanical fixation means, seen in a cross-section view from one end,
  • FIG. 11 is the same alternative design as that of FIG. 10 , seen from above,
  • FIG. 12 is the same alternative design as that of FIGS. 10 and 11 , seen in a cross-section view from one side,
  • FIG. 13 discloses a comparative voltage drop test of one anode according to that of the present invention and a state of the art anode
  • FIG. 14 discloses in a second embodiment an anode hanger with a yoke comprising a horizontal suspension plate and vertical rodding plates, seen in perspective,
  • FIG. 15 discloses an anode block processed and prepared for rodding with the yoke
  • FIG. 16 discloses in perspective an anode hanger having a yoke comprising one horizontal suspension plate rodded to an anode block,
  • FIG. 17 discloses a voltage drop test of one anode according to that of the present invention with horizontal suspension plate.
  • an anode hanger 1 with yoke 2 and anode rod 3 there is disclosed in perspective, an anode hanger 1 with yoke 2 and anode rod 3 .
  • the anode rod is commonly made out of aluminium or an alloy thereof, and has preferably a rectangular cross-section.
  • the yoke may in principle consist of four parts, two delta shaped suspension plates 4 , 4 ′ and two rodding plates 5 , 5 ′ that are interconnected with the suspension plates respectively.
  • the suspension plates 4 , 4 ′ and the rodding plates 5 , 5 ′ can be made out of appropriate steel plate qualities, and they can be interconnected by welding or by any other appropriate means.
  • the rodding plate 5 and the suspension plate 4 can be made out of one piece of a metallic plate, for instance a steel plate, by appropriate processing such as cutting and possibly bending (not shown).
  • rodding plate and suspension plate in this document may also relate to parts of such a complete plate, either produced out of one plate as mentioned above, or out of two plates, namely suspension plate 4 integrated with rodding plate 5 .
  • the complete yoke plates produced by either ways are denoted 54 , 54 ′.
  • Protrusions 8 , 8 ′′ are arranged at the rodding plate 5 for interaction with recesses formed in the anode top. There are also recesses formed allowing the rodding plates to be inserted into the anode top. This will be explained later. Similar protrusions are arranged at rodding plate 5 ′ (not shown).
  • the upper part of the suspension plates 4 , 4 ′ are attached to the lower part of the anode rod 3 .
  • connecting members 6 , 6 ′ of good electrical conductivity can be arranged in electrical contact with the anode rod 3 and each of the suspension plates 4 , 4 ′.
  • the anode hanger 1 is shown from one side.
  • the anode rod 3 is connected to a suspension plate 4 via several connecting members 6 , 6 ′, 7 , 7 ′, 7 ′′, 9 .
  • Connecting members 7 , 7 ′, 7 ′′ can be a steel plate part of a bimetal or tri-metal as it faces the suspension plates 4 , 4 ′ of steel.
  • the connecting members 6 , 6 ′ are preferably of aluminium to increase the contact area between the anode hanger 3 of aluminium and the bi-metal or tri-metal connection.
  • Connecting member 9 serves as the aluminium part of the bi-metal or tri-metal.
  • a joining plate represented by a thin sheet of titanium is in addition arranged between the connecting member 9 and 7 (and similarly at joint 3 - 7 ′′ and 6 ′- 7 ′)
  • the connecting members have preferably good electrical conductivity and also a certain mechanical strength.
  • the bi-metallic member will in principle have two contact areas of materials that are compatible with the materials in the anode rod 3 and that of the suspension plates 4 , 4 ′ respectively.
  • a tri-metallic connecting member will in addition comprise at third metal that enables the connection to operate appropriately at high temperatures.
  • the tri-metallic connecting member could consist of a steel-titanium-aluminium material based part.
  • the Figure discloses in more details the protrusions 8 , 8 ′′ in the rodding plate 5 , arranged for interaction with corresponding recesses in the anode top.
  • the protrusions can basically have a rectangular or a round cross-sectional shape.
  • FIG. 3 the anode hanger 1 of FIG. 1 is shown in a frontal view, where two suspension plates 4 , 4 ′ with respective rodding plates 5 , 5 ′ are attached to the anode rod 3 .
  • a connecting member 6 ′ is shown in the contact region between these parts.
  • protrusions 8 , 8 ′ In the lower part of the rodding plates 5 , 5 ′ there is shown protrusions 8 , 8 ′. These protrusions have in this example a rectangular shape, and may penetrate the rodding plates 5 , 5 ′ in a manner where they protrude both at the outside and the inside of the rodding plates.
  • FIG. 4 there is disclosed an anode hanger 1 as that of FIG. 3 assembled into a carbon anode block 20 , where there is first of all processed recesses 13 , 13 ′ (slots or grooves) oriented in the length direction of the anode block, that can receive the rodding plates 5 , 5 ′ at a certain insert depth. Further, the protrusions 8 , 8 ′ arranged at the rodding plates 5 , 5 ′ are mating corresponding recesses 10 , 10 ′ in the anode block 20 . Details regarding the encircled area at B will be further explained under FIG. 8 .
  • the anode block may have slots 21 , 22 open downwards for anode gas drainage, and have cantilevered external surfaces 23 at its corner regions.
  • FIG. 5 discloses in a cross-sectional view an anode hanger 1 assembled into a carbon anode block 20 as that of FIG. 4 , seen from one side, where the anode rod 3 is attached to the suspension plate 4 with rodding plate 5 and protrusions 8 , 8 ′′ engaged in corresponding undercut recesses 10 , 10 ′′ formed in the anode block 20 .
  • the rodding plate 5 is entered into the recess 13 .
  • the anode block has cantilevered surfaces at 23 , 23 ′. Details regarding the protrusion 8 ′′ and the recess 10 ′′ are shown in FIGS. 6 and 7 .
  • FIG. 6 discloses the anode hanger assembled into an a carbon anode as shown in FIG. 5 , seen from above, where an anode 20 is provided with recesses 10 , 10 ′′, 10 ′, 10 ′′′.
  • the yoke parts have protrusions 8 , 8 ′′, 8 ′, 8 ′′′ that have been entered into the recesses.
  • the recesses can be made by applying a circular milling tool, for instance formed as a little ‘saw-blade’ with both axial and radial cutters of polycrystalline diamond (PCD), and further arranged at a sufficient long axle that allows the tool to process a bore by a downward movement in a first step and an undercut recess in a subsequent processing step where the tool is moved along the length axis of the anode block ( 20 ).
  • a circular milling tool for instance formed as a little ‘saw-blade’ with both axial and radial cutters of polycrystalline diamond (PCD)
  • PCD polycrystalline diamond
  • FIG. 7 which shows enlarged details of the encircled area as denoted by A in FIG. 6
  • the rodding plate 5 with the protrusion 8 ′′ is first engaged into a top open part 11 ′′ of the recess 10 ′′ of the anode block 20 , and then moved horizontally and further engaged into a top closed or undercut part of the recess 10 ′′ of the anode block 20 .
  • FIG. 8 corresponds in part to an enlarged view of the encircled area as denoted by B in FIG. 4 and shows more details of the recesses 13 and 10 . It comprises a first top open part or bore 11 similar to that shown in FIG. 7 that has been processed at an appropriate location of the recess 13 . Further, the recess 10 is undercut and has two flanges 12 , 12 ′.
  • the protrusion 8 arranged at the rodding plate 5 has been entered downwards into the bore 11 and has been further moved inside the undercut part (top closed part) of the recess as shown in the Figure, it will rest in that position and being able to carry vertical loads represented by the anode block 20 via flanges 12 , 12 ′ formed in the anode block.
  • the protrusions 8 , 8 ′, 8 ′′′ will have entered their corresponding recesses 10 , 10 ′, 10 ′′′ respectively, see FIGS. 5 and 6 .
  • FIG. 9 discloses an anode assembly with anode rod 3 , suspension plates 4 , 4 ′, rodding plates 5 , 5 ′, recesses 13 , 13 ′, bore 11 , 11 ′′ (in part) and anode block 20 .
  • conductive electric particles are filled in to the voids between the rodding plates and the recesses in the anode block, and a collar mass can be applied to the metallic parts at the anode top as protection against corrosive attacks (not shown).
  • the protrusion 8 , 8 ′′, 8 ′, 8 ′′′ in the above examples may consist of cylindrical rods that are entered into a bore through the rodding plates. These rods can be fixed by a press-fit arrangement, and arranged for easy removal and exchange.
  • the shape of the protrusions can be flattened, i.e. having a more extended, planar surface acting against the recess in the anode. This will distribute the loads of the anode block over a larger area.
  • the protrusions may consist of studs that are welded to the outside and/or the inside of the respective rodding plate.
  • FIG. 10 discloses an alternative design of a mechanical fixation means, seen in a cross-section view from one end, where an anode block 20 has slots 21 , 22 in its bottom part, and where recesses 100 , 100 ′ are made in its top part.
  • an anode block 20 has slots 21 , 22 in its bottom part, and where recesses 100 , 100 ′ are made in its top part.
  • two rodding plates, 5 , 5 ′ respectively, and bolts 14 , 15 have been applied to secure the yoke plates to the anode block.
  • Bolts 14 , 15 pass through bores in the rodding plates 5 , 5 ′ and are secured into preformed recesses or bores in the anode block.
  • the bolts may be threaded and corresponding threads may be arranged in the rodding plate and/or the bores of the anode block 20 .
  • suspension plates 4 , 4 ′ have in their upper parts an additional plate material 16 , 17 of better electronic conductivity, such as copper or an appropriate copper alloy, that will reduce the voltage drop in the assembly significantly.
  • the additional plate material can be either a clad material or a material electrically integrated with the yoke plates by other means.
  • the additional plate material may also serve to optimise the thermal loss from the yoke.
  • the Figure shows two reinforcement parts 27 , 28 that preferably can be welded to the suspension plates 4 , 4 ′.
  • the reinforcement parts are preferably of a metallic material, such as steel and will enhance the sideways stability of the yoke. It will also reduce the voltage drop between the anode rod and the yoke.
  • FIG. 11 is the same alternative design as that of FIG. 10 , seen from above, where the rodding plates 5 , 5 ′ are fixed to the anode block 20 by means of bolts 14 , 14 ′, 14 ′′ and 15 , 15 ′, 15 ′′.
  • FIG. 12 is the same alternative design as that of FIGS. 10 and 11 , seen in a cross-section view from one side, where the anode block 20 has a slot 21 in its bottom part and a rodding plate 5 is inserted from the top side.
  • the rodding plate is fixed by means of bolts 14 , 14 ′ and 14 ′′.
  • a clad plate material is shown at 16 at the suspension plate 4
  • the anode rod is shown at 3 .
  • a tri-metallic connection is shown at 18 , 19 , 26 .
  • suspension- and rodding-plates are dependent on what yoke that is being replaced.
  • the contact area towards the carbon is doubled.
  • a 20 mm thick rodding plate will reduce the heat conducting steel cross section by 50%.
  • a decrease in dimensions will reduce heat loss and increase voltage drop and is could be beneficial for reducing interpolar space.
  • the suspension plates can be of a steel material and of a thickness of 35 mm in case there is no clad or composite material in this part.
  • the rodding plate can be of the same material in a thickness of 20 mm.
  • the thickness of the clad Cu material can be 8 mm while the steel suspension plate is 20 mm.
  • the rodding plate can be 20 mm thick.
  • Yokes with rodding plates of smaller thickness than that of the suspension plates have shown to have positive effects with regard to reducing the thermal loss via the anode yoke.
  • yoke plates with corresponding slots in the anode top.
  • a central yoke plate arranged between the two shown in the Figs. may be applied.
  • FIG. 13 discloses a comparative voltage drop test of one anode according to the embodiment described above having two suspension/rodding plates, named Twin-put (lower curve) and a state of the art reference anode with a yoke having stubs and where bores are made in the anode top and that the rodding is made by cast iron (upper curve).
  • Twin-put lower curve
  • the curves have been made more suitable for printing by some drawing assisted by hand.
  • the voltage drop measurement is done at corresponding locations at the anode rod and at the anode top.
  • the curves shows the voltage drop (vertical axis) versus time after start-up in an electrolysis cell.
  • the voltage drop has stabilized to a level of approximately 120 mV.
  • FIG. 14 One other embodiment of the invention is shown in FIG. 14 , where an anode hanger 101 with a horizontally oriented suspension plate 104 and five rodding plates 105 , 105 ′, 105 ′′, 105 ′′′, 105 ′′′′ is seen in perspective.
  • the rodding plate 105 ′′′′ has two protrusions, 108 ′′ and 108 ′′′.
  • the rodding plate 105 has also two protrusions 108 , 108 ′ like this (not shown). These four protrusions will match corresponding recesses in an anode block, and being able to suspend the block.
  • connecting members 106 , 106 ′, 106 ′′ between the anode rod and the suspension plate can be of bimetallic and/or trimetallic types.
  • the spacer can be advantageous in that it spaces the connecting members away from the heat and corrosive gases evolved in the electrolysis process.
  • the spacer 144 can be out of a metallic material such as steel and be welded to the suspension plate.
  • the suspension plate can be connected to the anode rod via the connecting members but without any spacer 144 (not shown).
  • the spacer 144 can be made out of several plates of an electrical conducting material and further being arranged in such a manner that the plates defines a gas tight void that can be filled with thermal insulation.
  • a similar construction can be applied to the suspension plates 4 , 4 ′ in the first example.
  • One advantage with this solution could be that the necessity for covering the anode top with anode covering material can be reduced and possibly eliminated.
  • FIG. 15 discloses in perspective an anode block 120 processed and prepared for rodding with the anode hanger 101 .
  • the anode block 120 there is processed five recesses 113 , 113 ′, 113 ′′, 113 ′′′, 113 ′′′′, being able to receive the corresponding rodding plates mentioned above. Further, similar to that shown in FIG.
  • FIG. 16 discloses in perspective an anode having an anode hanger comprising one anode rod 103 , connecting members 106 , 106 ′, 106 ′′, a spacer 144 , a suspension plate 104 rodded with an anode block 120 .
  • anode block can be secured to the current lead by means of a spike, bolt or the like interconnecting the rodding plates ( 105 , 105 ′′′′) with the anode block ( 120 ).
  • conductive electric particles are filled in to the voids between the rodding plates and the recesses in the anode block, and a collar mass can possibly be applied to the metallic parts at the anode top as protection against corrosive attacks (not shown).
  • the protrusion 108 , 108 ′′, 108 ′, 108 ′′′ in the above examples may consist of cylindrical rods that are entered into a bore through the rodding plates. These rods can be fixed by a press-fit arrangement, and arranged for easy removal and exchange.
  • the shape of the protrusions can be flattened, i.e. having a more extended, planar surface acting against the recess in the anode. This will distribute the loads of the anode block over a larger area.
  • the protrusions may consist of studs that are welded to the outside and/or the inside of the respective rodding plate.
  • FIG. 17 discloses a voltage drop test of one anode according to that of the present invention (lower curves) with horizontal suspension plate versus a typical standard anode (upper curve). It can be seen that the voltage drop can be reduced with approximately 12 ⁇ ohm with regard to a typical standard anode (lower curves).
  • the clad or composite plate material applied in at the suspension plate(s) may be protected by a shield or any other appropriate means to avoid deterioration.
  • a shield made of a steel plate that cover the clad or composite material may be appropriate.
  • the main part of the recesses in the anode top for the rodding plates may be formed while the anode is in its green condition, i.e. before it is calcinated.
  • the main part of the recesses can also be made by a anode slotting apparatus, for instance as shown in the Applicant's own publication EP 1781441 A1.
  • the recess can then be calibrated by a rotating processing tool, either having a shape complementary to the final shape of the recess or having a dimension mince than that of the final shape.
  • the tool can be arranged to fit a CNC machine or the similar, thus the machining (processing) will be performed in an automated manner.
  • the top open recesses are made, and subsequently the same tool or any other appropriate tool is moved along the recess inside the anode top to make the top closed recesses with load carrying flanges 12 , 12 ′.
  • the electrical conducting solids or particles can be of any appropriate metal such as steel, iron, copper, aluminium etc., or alloys of same.
  • the shape of the solids can be spherical, oval or elliptic, flaked, or have any appropriate shape.
  • the size and particle distribution may vary. The maximum size will in general be restricted by the space to be filled. A non-homogenous distribution of particle sizes may be convenient to obtain a compact filling as possible, with little space between the particles.
  • the applied material should have good mechanical properties (crushing properties) and be able to sustain high temperatures. Magnetic properties may be advantageous for recycling reasons in the butts handling station.
  • the size of said solids can be from 0.1 millimetres and close to the minimum opening (the void) between the rodding plates and the walls of the recesses in the anode block. Commonly, the size may be up to 10 millimetres.
  • the electrical conducting particles can be stored in a container or in an appropriate storage at a higher level than the recess in the anode to be filled.
  • a tube fastened to this container with a valve and an appropriate opening towards the slot could regulate the correct amount of particles into the slot.
  • vibration can be applied to obtain a more compact filling.
  • the anode block and/or the yoke plates bar can be vibrated.
  • a vibrating stick can be applied in the recess filled with conductive particles, to generate vibration directly of the filled-in material.
  • collar paste for anodes or other protecting substance may be used to make an encapsulating and protective layer at the top of the electrical conducting particles.
  • Worn out anodes can commonly be handled in a rodding station where the butts is removed from the yoke (after removal of any anode covering material).
  • the butts is cracked in a manner where it falls off mainly in a few large pieces divided along the direction of its fixation. Otherwise it can be crushed or knocked off the hanger.
  • the butts is conventionally put on a conveyer.
  • the anode yoke is preferably magnetized by appropriate means, whereby the particles will be attracted to the yoke during the butts removal.
  • the yoke is preferably moved to another part of the rodding station for recovery of the fill-in material. Then the yoke can be de-magnetized to let the particles come off. Any remaining particles on the previously embedded part of yoke can be removed by simple mechanical methods such as scraping, as the particles come off easily.
  • the previously embedded part of the yoke can be blasted (as by sand blasting) preferably by means of a particles of the same type as or that is compatible with the actual fill-in material such as iron, steel or any other electrical conductive material.
  • sand blasting can be carried out by sand, alumina, or any other appropriate material.
  • non-magnetic fill-in materials can be recovered and re-used as well, even if the separation and recover technology would be somewhat different than that described above.
  • a sort of sieve may be applied to separate butts from fill-in material.
  • the recovered fill-in material may come off as clusters of particles. These clusters may need to be crushed down to more or less single particles to be re-used as fill-in material determined by the opening of the actual recess to be filled. The crushing can be done by adapting conventional apparatus.

Landscapes

  • 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)
  • Prevention Of Electric Corrosion (AREA)
US15/548,840 2015-02-13 2016-02-09 An anode for use in an electrolysis process for production of aluminium in cells of hall-héroult type, and a method for making same Abandoned US20180023206A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
NO20150224 2015-02-13
NO20150224 2015-02-13
PCT/NO2016/000005 WO2016130014A1 (en) 2015-02-13 2016-02-09 An anode for use in an electrolysis process for production of aluminium in cells of hall-heroult type, and a method for making same

Publications (1)

Publication Number Publication Date
US20180023206A1 true US20180023206A1 (en) 2018-01-25

Family

ID=56615560

Family Applications (1)

Application Number Title Priority Date Filing Date
US15/548,840 Abandoned US20180023206A1 (en) 2015-02-13 2016-02-09 An anode for use in an electrolysis process for production of aluminium in cells of hall-héroult type, and a method for making same

Country Status (10)

Country Link
US (1) US20180023206A1 (de)
EP (1) EP3256622B1 (de)
CN (1) CN107208288B (de)
AU (1) AU2016218531B2 (de)
BR (1) BR112017017062A2 (de)
CA (1) CA2975081C (de)
EA (1) EA035309B1 (de)
NZ (1) NZ733895A (de)
WO (1) WO2016130014A1 (de)
ZA (1) ZA201705026B (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO343337B1 (en) * 2017-05-29 2019-02-04 Norsk Hydro As Device for gripping an anode for lifting operations and method for operating same
NO345291B1 (en) * 2018-09-12 2020-11-30 Hmr Hydeq As An aluminium production anode yoke, an anode hanger, and a carbon anode
FR3090700B1 (fr) * 2018-12-20 2021-01-01 Rio Tinto Alcan Int Ltd Ensemble anodique et cuve d’électrolyse comprenant cet ensemble anodique
FR3121938B1 (fr) * 2021-04-16 2023-03-10 Rio Tinto Alcan Int Ltd Multipode et ensemble anodique

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4443314A (en) * 1983-03-16 1984-04-17 Great Lakes Carbon Corporation Anode assembly for molten salt electrolysis
US4787965A (en) * 1986-11-14 1988-11-29 Societe Des Electrodes Protective coating for the carrier bars of prebaked anodes and the emerging part of said anodes
US20030075454A1 (en) * 2000-12-01 2003-04-24 Nora Vittorio De Prevention of dissolution of metal-based aluminium production anodes
WO2009099335A1 (en) * 2008-02-06 2009-08-13 Norsk Hydro Asa Electrode and a method for making same
CN102400178A (zh) * 2010-09-09 2012-04-04 沈阳铝镁设计研究院有限公司 连接铝导杆和阳极炭块的夹紧装置
WO2012119501A1 (zh) * 2011-03-07 2012-09-13 Chen Huzheng 铝电解用阳极及其生产方法
US20140138240A1 (en) * 2011-07-12 2014-05-22 Rio Tinto Alcan International Limited Aluminum smelter including cells with cathode output at the bottom of the pot shell and cell stabilizing means
US20160208399A1 (en) * 2013-12-16 2016-07-21 Hatch Ltd. Low resistance electrode assemblies for production of metals

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2942469C2 (de) 1979-10-20 1983-09-15 Sigri Elektrographit Gmbh, 8901 Meitingen Kohlenstoffhaltige Kontaktmasse
EP0150680A3 (de) 1984-01-18 1985-08-28 Schweizerische Aluminium AG Verfahren zum Befestigen von Anodenblöcken an einer Anodenaufhängung
NO883887L (no) * 1988-08-31 1990-03-01 Norsk Hydro As Festeanordning for karbonanoder.
NO933197L (no) * 1993-09-08 1995-03-09 Norsk Hydro As Strömleder/oppheng for karbonanoder
NO327346B1 (no) 2004-08-16 2009-06-15 Norsk Hydro As Fremgangsmate og anordning for bearbeiding av karbonlegemer
CN201634781U (zh) * 2009-05-25 2010-11-17 高德金 夹持式阳极导电装置

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4443314A (en) * 1983-03-16 1984-04-17 Great Lakes Carbon Corporation Anode assembly for molten salt electrolysis
US4787965A (en) * 1986-11-14 1988-11-29 Societe Des Electrodes Protective coating for the carrier bars of prebaked anodes and the emerging part of said anodes
US20030075454A1 (en) * 2000-12-01 2003-04-24 Nora Vittorio De Prevention of dissolution of metal-based aluminium production anodes
WO2009099335A1 (en) * 2008-02-06 2009-08-13 Norsk Hydro Asa Electrode and a method for making same
CN102400178A (zh) * 2010-09-09 2012-04-04 沈阳铝镁设计研究院有限公司 连接铝导杆和阳极炭块的夹紧装置
WO2012119501A1 (zh) * 2011-03-07 2012-09-13 Chen Huzheng 铝电解用阳极及其生产方法
US20140138240A1 (en) * 2011-07-12 2014-05-22 Rio Tinto Alcan International Limited Aluminum smelter including cells with cathode output at the bottom of the pot shell and cell stabilizing means
US20160208399A1 (en) * 2013-12-16 2016-07-21 Hatch Ltd. Low resistance electrode assemblies for production of metals

Also Published As

Publication number Publication date
NZ733895A (en) 2018-09-28
CA2975081C (en) 2022-07-19
WO2016130014A1 (en) 2016-08-18
EP3256622B1 (de) 2023-01-18
EP3256622A1 (de) 2017-12-20
CN107208288B (zh) 2020-11-27
AU2016218531A1 (en) 2017-08-03
EA035309B1 (ru) 2020-05-27
CN107208288A (zh) 2017-09-26
AU2016218531B2 (en) 2020-06-11
BR112017017062A2 (pt) 2018-04-10
CA2975081A1 (en) 2016-08-18
EP3256622A4 (de) 2018-10-31
ZA201705026B (en) 2019-07-31
EA201791832A1 (ru) 2017-12-29

Similar Documents

Publication Publication Date Title
EP2242976B1 (de) Elektrode zur verwendung in einem elektrolyseverfahren zur herstellung von aluminium
AU2016218531B2 (en) An anode for use in an electrolysis process for production of aluminium in cells of hall-heroult type, and a method for making same
WO2011148347A1 (en) Hall-heroult cell cathode design
CN104831320B (zh) 用于产生金属的低电阻电极组件
US4574019A (en) Process for attaching anode blocks to an anode suspension means
WO2019245386A1 (en) Anode hanger, and method of production thereof
GB2558936A (en) Cathode assembly with metallic collector bar for electrolytic cell suitable for the Hall-Héroult process
WO2014003571A1 (en) Electrode and a method for making same
CA2910088A1 (en) Cathode block having a slot with a varying depth and a filled intermediate space
CA2869983C (en) Electrolysis cell, in particular for the production of aluminum
CN105821447B (zh) 一种连续预焙阳极用的炭块固定方法及装置
EP4158084A1 (de) Kathodenanordnung mit metallischen kollektorstabsystemen für elektrolysezelle für hall-héroult-verfahren
EP2650404B1 (de) Elektrolysezelle, insbesondere zur Herstellung von Aluminium
CN105821448B (zh) 一种连续预焙阳极用的开合式承重导电梁
AU2020443557A1 (en) Cathode assembly for a hall-heroult cell for aluminium production and method for making same
NZ714551A (en) Low resistance electrode assemblies for production of metals

Legal Events

Date Code Title Description
AS Assignment

Owner name: NORSK HYDRO ASA, NORWAY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HOP, JORUND;VEE, INGE ARILD;STEFANSKI, GRZEGORZ;AND OTHERS;SIGNING DATES FROM 20170815 TO 20170919;REEL/FRAME:044171/0640

STPP Information on status: patent application and granting procedure in general

Free format text: NON FINAL ACTION MAILED

STPP Information on status: patent application and granting procedure in general

Free format text: RESPONSE TO NON-FINAL OFFICE ACTION ENTERED AND FORWARDED TO EXAMINER

STPP Information on status: patent application and granting procedure in general

Free format text: NON FINAL ACTION MAILED

STPP Information on status: patent application and granting procedure in general

Free format text: RESPONSE TO NON-FINAL OFFICE ACTION ENTERED AND FORWARDED TO EXAMINER

STPP Information on status: patent application and granting procedure in general

Free format text: FINAL REJECTION MAILED

STPP Information on status: patent application and granting procedure in general

Free format text: ADVISORY ACTION MAILED

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION