EP3164530A1 - Anodenanordnung - Google Patents

Anodenanordnung

Info

Publication number
EP3164530A1
EP3164530A1 EP15814208.3A EP15814208A EP3164530A1 EP 3164530 A1 EP3164530 A1 EP 3164530A1 EP 15814208 A EP15814208 A EP 15814208A EP 3164530 A1 EP3164530 A1 EP 3164530A1
Authority
EP
European Patent Office
Prior art keywords
anode
electrical connection
thermally insulating
support
anode assembly
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.)
Granted
Application number
EP15814208.3A
Other languages
English (en)
French (fr)
Other versions
EP3164530A4 (de
EP3164530B1 (de
Inventor
Sébastien BECASSE
Jean-François BILODEAU
Denis Laroche
Laurent Fiot
Steve Langlois
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rio Tinto Alcan International Ltd
Original Assignee
Rio Tinto Alcan International Ltd
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 Rio Tinto Alcan International Ltd filed Critical Rio Tinto Alcan International Ltd
Publication of EP3164530A1 publication Critical patent/EP3164530A1/de
Publication of EP3164530A4 publication Critical patent/EP3164530A4/de
Application granted granted Critical
Publication of EP3164530B1 publication Critical patent/EP3164530B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • 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
    • C25C3/085—Cell construction, e.g. bottoms, walls, cathodes characterised by its non electrically conducting heat insulating parts
    • 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 assembly comprising an anode support and an anode for the production of aluminum.
  • Aluminum is conventionally produced in aluminum smelters, by electrolysis, according to the Hall-Héroult process.
  • an electrolysis cell comprising a box and an inner lining of refractory material.
  • the electrolytic cell also comprises cathode blocks arranged at the bottom of the box, traversed by conductive bars for collecting the electrolysis current and leading it to a subsequent electrolysis cell.
  • the electrolysis cell also comprises at least one anode block suspended on an anode support, such as a cross member, the anode block being partially immersed in an electrolytic bath, above the cathode blocks.
  • a liquid aluminum sheet, covering the cathode blocks, is formed as and when the reaction.
  • the flow of current is from the anode carrier to the cathode via the anode block and the electrolytic bath at a temperature of about 970 ° C wherein the alumina is dissolved.
  • This electrolysis current has an intensity of up to several hundreds of thousands of amperes.
  • the suspension of the anode block is then carried out by an intermediate element, capable of carrying this strong current, of resisting these very high temperatures but which is also capable of supporting the weight of the anode, such as a log made of steel.
  • the point reduction of the cross-section of the log made it possible to obtain a significant drop in temperature: from 650 ° C to 320 ° C for a reduction of the section over a log length of about 10 cm.
  • the log may be formed of two portions having different cross sections, and may be machined or formed of separate elements welded to reduce the loss of thermal energy by conduction.
  • this section reduction decreases the electrical conductance and therefore increases the power consumption.
  • this solution has a significant financial cost because it requires machining at least a portion from a log available in the general form of a standard cylinder. This machining step is also time consuming and contributes to a consequent loss of material.
  • the invention aims to provide a device for limiting heat losses without affecting its electrical conductance while limiting costs.
  • an anode assembly for the production of aluminum comprising an anode, an anode support, and an electrical connection element comprising a sealing portion and an out-sealing portion for electrically connecting the support of anode at the anode, wherein the anode comprises a recess in which is housed the sealing portion of the electrical connecting member and wherein a seal formed of an electrically conductive material retains the electrical connecting member, anode assembly comprising at least one thermally insulating element arranged between two facing walls belonging to the out-sealing portion of the electrical connection element and / or the anode support to reduce the heat transfer between the anode and the anode support when producing aluminum.
  • the sealing ensures an electrical conduction function while allowing mechanical attachment between the electrical connection element and the anode. Sealing typically extends along the side wall of the sealing portion of the electrical connecting member. This lateral contact between the seal and the electrical connection element allows a very good electrical conduction, but also a very good thermal conductivity between the anode and the electrical connection element.
  • the two walls facing each other are electrically and mechanically connected by means of a bead of electrically conductive material, plus particularly a weld seam.
  • the bead of electrically conductive material provides mechanical strength and electrical conduction in the area where the two walls are separated by the thermally insulating element.
  • the electrical connection element extends in an extension direction between the anode and the anode support and at least one thermally insulating element extends in a plane transverse to the direction of extension. .
  • the thermal transfer along a cross-section of the electrical connection element is significantly reduced because the heat losses by radiation between the surfaces between which the thermally insulating element is interposed are prevented.
  • At least one thermally insulating element is arranged between a wall of the electrical connection element and a wall of the anode support.
  • This configuration with a thermally insulating element interposed between the electrical connection element and the anode support is particularly advantageous in that the radiative heat flux and conduction between the electrical connection element and the anode support is limited. The presence of thermal insulation at this interface is thus very simple to implement and very effective in limiting energy losses.
  • the anode assembly comprises a bead of electrically conductive material, more particularly a weld bead, arranged to electrically and mechanically connect the electrical connection element and the anode support.
  • the electrical connection element provides mechanical support for the anode while promoting electrical conduction between the anode support and the anode.
  • the out-sealing portion of the electrical connection element delimits a housing in which is disposed at least one thermally insulating element.
  • the thermally insulating element prevents heat losses by radiation between opposite walls of the housing.
  • the housing is formed by a notch in the electrical connection element. This notch may in particular be machined in the electrical connection element.
  • the notch opens out laterally of the out-sealing portion of the electrical connection element so that the thermally insulating element is easily introduced into the electrical connection element.
  • This variant is thus very simple to put into practice.
  • the out-sealing portion of the electrical connection element comprises a first portion and a second portion, the first and second portions being separated by at least one thermally insulating element.
  • conductive heat transfer is limited on the cross-section of the out-seal portion of the electrical connection element between the first and second portions.
  • a complementary bead of electrically conductive material is arranged to cover at least a portion of said at least one thermally insulating element and to electrically and mechanically connect the first portion and the second portion.
  • the mechanical strength and the electrical conduction between the anode support and the anode thus remains very satisfactory, for a reduction of the important heat transfer.
  • the thermally insulating element is further protected by this enclosure in the housing.
  • the anode assembly further comprises a thermally insulating element disposed at the interface between the electrical connection element and the anode support.
  • a thermally insulating element disposed at the interface between the electrical connection element and the anode support.
  • the first portion disposed on the side of the anode support has a reduced cross section relative to that of the second portion disposed on the side of the anode and an electrical conduction member is arranged to electrically connect the second portion and the anode support.
  • an electrical conduction member is arranged to electrically connect the second portion and the anode support.
  • the electrical connection element comprises a substantially cylindrical shape, such as a steel log.
  • the steel makes it possible to withstand the corrosive environment in the electrolysis cell, at very high temperatures and is sufficiently resistant to support the anode.
  • At least one thermally insulating element comprises a plate form, formed in particular of a sintered powder, a film or a fiber felt comprising at least one refractory material.
  • the sintered powder has the advantage of being easily shaped and is adaptable to be disposed in any geometric configuration of the anode assembly.
  • Figure 1 illustrates an anode assembly according to a first embodiment of the invention.
  • FIG. 2 illustrates an anode assembly according to an alternative embodiment of the invention.
  • Figure 3 illustrates an anode assembly according to a second embodiment of the invention.
  • Figure 4 illustrates an anode assembly according to yet another embodiment of the invention.
  • the anode assembly 100 comprises an anode 3, typically of carbon, and an anode support 4 for the production of aluminum by electrolysis according to the Hall-Héroult method.
  • the anode 3 is suspended from the anode support 4 by an electrical connection element 1 comprising a sealing portion 21 ensuring the attachment to the anode 3 and the electrical conduction to the anode 3, and an out-seal portion 22 ensuring the mechanical suspension of the anode 3.
  • the anode 3 comprises in its upper part a recess 7 in which the sealing portion 21 of the electrical connecting element 1 is housed and fixed by a seal 8 of an electrically conductive material, cast iron for example.
  • the sealing portion 21 is therefore the lower part of the electrical connection element 1 which is caught in the seal 8, in contrast to the out-seal portion 22 which extends above the seal 8.
  • any other material suitable for sealing 8 may be used, especially sticky carbon paste.
  • This seal 8 covers all the surfaces of the recess 7 and the sealing portion 21 of the electrical connecting element 1 housed in the recess 7.
  • the seal 8 may otherwise extend along the side walls of the the sealing portion 21 and not on the underside.
  • the anode assembly also comprises a bead 9 of electrically conductive material, arranged to provide the electrical and mechanical connection between the anode support 4 and the electrical connection element 1, more particularly in the upper part of the out-seal portion 22 of the electrical connecting element 1.
  • the electrical connecting element 1 is typically made of steel and has a cylinder shape.
  • the bead 9 may be formed by a cupro-type copper-based weld disposed laterally at the interface between the electrical connection element 1 and the anode support 4.
  • FIG. 1 also illustrates in the out-seal portion 22 a thermally insulating element 6 which extends in a plane transverse to the direction of extension of the electrical connection element 1 between the anode 3 and the anode support 4.
  • the electrical connection element 1 comprises a housing 5, formed of a notch opening laterally and in which is disposed a thermally insulating element 6.
  • This thermally insulating element 6 may consist of any suitable refractory materials, such as sintered powder, a film or a fiber felt, comprising at least one refractory material.
  • the out-sealing portion 22 of the electrical connection element 1 comprises a first portion 11 and a second portion 12 distinct from the first portion 11 and between which a thermally insulating element 6 is arranged.
  • the heat transfer by conduction is thus significantly reduced by the fact that the entire cross section of the electrical connecting element 1 is covered by the thermally insulating element 6.
  • the electrical conduction is then provided by a complementary bead 13 of an electrically conductive material disposed laterally to the thermally insulating element 6 so as to electrically and mechanically connect the first portion 11 and the second portion 12.
  • the embodiment illustrated in FIG. 3 differs from the two previous embodiments, in particular in that the thermally insulating element 6 is disposed at the interface between the electrical connection element 1 and the anode support 4.
  • the embodiment illustrated in Figure 1 the bead 9 is disposed laterally to the insulating member 6 to provide an electrical and mechanical connection between the out-sealing portion 22 of the electrical connecting member 1 and the anode support 4. It has been observed that the electrical conduction between the anode and the anode support was mainly carried out by the weld bead 9 and not by the opposite surfaces brought into contact so that a thermally insulating element can advantageously be inserted between the electrical connection element and the anode support without prejudicing the overall electrical conduction. Radiation thermal losses can therefore be limited between the electrical connection element and the anode support.
  • the out-sealing portion 22 of the electrical connection element 1 comprises a first portion 1 1 disposed on the side of the anode support 4 and a second portion 12 disposed on the side of the anode 3.
  • the cross section of the first portion 1 1 is reduced compared to that of the second portion 12 to limit the heat transfer.
  • the anode assembly comprises a thermally insulating element 6 disposed between the electrical connection element 1 and the anode support 4 and further comprises a thermally insulating element 6 disposed between the first portion 1 1 and the second portion 12.
  • An electrical conduction member 14, such as a copper plate, is arranged to provide an electrical connection between the second portion 12 and the anode support 4 and rests against a portion of the first portion 11.
  • the heat transfer is very limited by the presence of the two thermally insulating elements 6 and the reduced cross section of the first portion 11.
  • the electrical connection is provided by the cord 9 and the complementary bead 13 as well as by the highly conductive copper plate.
  • the section of the copper plate being reduced, the thermal conduction thereby remains very limited.
  • the present invention provides an anode assembly 100 to effectively reduce the heat loss between the anode 3 and the anode carrier 4 by reducing heat transfer while also ensuring the maintenance of a very good electrical conduction.

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)
  • Secondary Cells (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Microwave Tubes (AREA)
EP15814208.3A 2014-07-04 2015-07-01 Anodenanordnung Active EP3164530B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1401517 2014-07-04
PCT/IB2015/001109 WO2016001741A1 (fr) 2014-07-04 2015-07-01 Ensemble anodique

Publications (3)

Publication Number Publication Date
EP3164530A1 true EP3164530A1 (de) 2017-05-10
EP3164530A4 EP3164530A4 (de) 2018-01-17
EP3164530B1 EP3164530B1 (de) 2019-04-24

Family

ID=51483482

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15814208.3A Active EP3164530B1 (de) 2014-07-04 2015-07-01 Anodenanordnung

Country Status (10)

Country Link
US (1) US10443140B2 (de)
EP (1) EP3164530B1 (de)
CN (1) CN106471160B (de)
AR (1) AR101928A1 (de)
AU (1) AU2015282392B2 (de)
BR (1) BR112016028617B1 (de)
CA (1) CA2952166C (de)
DK (1) DK179336B1 (de)
EA (1) EA037127B1 (de)
WO (1) WO2016001741A1 (de)

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB962599A (en) * 1961-08-03 1964-07-01 Montedison Spa Electrolytic furnace for aluminium production
US3509030A (en) * 1967-12-15 1970-04-28 Alcan Res & Dev Casing liner
DE3009098C2 (de) 1979-12-21 1983-02-24 Schweizerische Aluminium AG, 3965 Chippis Verfahren zur Führung des Stromes zwischen Elektrolyseöfen
FR2527229A1 (fr) * 1982-05-18 1983-11-25 Aluminium Grece Procede de calorifugeage des anodes precuites dans les cuves d'electrolyse pour la production d'aluminium
FR2565258B1 (fr) * 1984-05-29 1986-08-29 Pechiney Aluminium Anode carbonee a rondins partiellement retrecis destinee aux cuves pour la production d'aluminium par electrolyse
AUPQ218899A0 (en) * 1999-08-13 1999-09-02 Jakovac, Vjekoslav Anode assembly comprising separation of electrical and mechanical functions of the assembly
FR2900938B1 (fr) * 2006-05-15 2008-06-20 Ecl Soc Par Actions Simplifiee Procede de fabrication d'anodes pour la production d'aluminium par electrolyse ignee, lesdites anodes et leur utilisation
EP2006419A1 (de) * 2007-06-22 2008-12-24 Sgl Carbon Ag Anodenanordnung mit verringertem Spannungsabfall für eine Aluminiumelektrolysezelle
CN101709485B (zh) * 2009-12-18 2012-07-04 中国铝业股份有限公司 一种采用惰性阳极生产原铝的铝电解槽
WO2012100340A1 (en) * 2011-01-28 2012-08-02 UNIVERSITé LAVAL Anode and connector for a hall-heroult industrial cell

Also Published As

Publication number Publication date
EP3164530A4 (de) 2018-01-17
US10443140B2 (en) 2019-10-15
EA037127B1 (ru) 2021-02-09
WO2016001741A1 (fr) 2016-01-07
CA2952166C (fr) 2022-07-26
AR101928A1 (es) 2017-01-25
CN106471160B (zh) 2018-10-16
DK201670975A1 (en) 2017-01-09
BR112016028617A2 (pt) 2017-08-22
BR112016028617B1 (pt) 2021-11-03
AU2015282392B2 (en) 2019-03-14
CA2952166A1 (fr) 2016-01-07
AU2015282392A1 (en) 2017-01-05
CN106471160A (zh) 2017-03-01
EA201790130A1 (ru) 2017-06-30
DK179336B1 (en) 2018-05-14
EP3164530B1 (de) 2019-04-24
US20170167039A1 (en) 2017-06-15

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