EP0034117A2 - Disposition asymétrique de barres d'amenée de courant pour cellules d'électrolyse - Google Patents

Disposition asymétrique de barres d'amenée de courant pour cellules d'électrolyse Download PDF

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Publication number
EP0034117A2
EP0034117A2 EP81810017A EP81810017A EP0034117A2 EP 0034117 A2 EP0034117 A2 EP 0034117A2 EP 81810017 A EP81810017 A EP 81810017A EP 81810017 A EP81810017 A EP 81810017A EP 0034117 A2 EP0034117 A2 EP 0034117A2
Authority
EP
European Patent Office
Prior art keywords
cell
bar ends
cathode bar
row
rail arrangement
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Withdrawn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
EP81810017A
Other languages
German (de)
English (en)
Other versions
EP0034117A3 (fr
Inventor
Jean-Marc Blanc
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.)
Alcan Holdings Switzerland AG
Original Assignee
Alusuisse Holdings AG
Schweizerische Aluminium AG
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 Alusuisse Holdings AG, Schweizerische Aluminium AG filed Critical Alusuisse Holdings AG
Publication of EP0034117A2 publication Critical patent/EP0034117A2/fr
Publication of EP0034117A3 publication Critical patent/EP0034117A3/fr
Withdrawn legal-status Critical Current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
    • C25C3/16—Electric current supply devices, e.g. bus bars

Definitions

  • the present invention relates to an asymmetrical rail arrangement for conducting the direct electrical current from the cathode bar ends of a longitudinal electrolysis cell, in particular for the production of aluminum, via a plurality of current rails which run along the longitudinal sides of the cell and lead to the traverse ends of the subsequent cell.
  • the electrolysis cell In normal operation, the electrolysis cell is usually operated periodically, even if there is no anode effect by breaking in the crust and adding alumina.
  • the cathode bars are embedded in the carbon bottom of the electrolysis cells, the ends of which penetrate the electrolysis tank on both long sides. These iron bars collect the electrolysis current, which flows via the busbars arranged outside the cell, the risers, the trusses and the anode rods to the carbon anodes of the subsequent cell.
  • the ohmic resistance from the cathode bars to the anodes of the subsequent cell causes energy losses in the order of up to 1 kWh / kg of aluminum produced. Attempts have therefore repeatedly been made to optimize the arrangement of the busbars with respect to the ohmic resistance.
  • the vertical components of magnetic induction formed must also be taken into account, which - together with the horizontal current density components - generate a force field in the liquid metal obtained through the reduction process.
  • the current is conducted from cell to cell as follows:
  • the direct electrical current emerges from cathode bars arranged in the carbon bottom of the cell.
  • the ends of the cathode bars are connected to the busbars by means of flexible bands, which run along the electrolytic cells. From these along the long sides; of the busbars running through the cells, the electrical current is conducted via other flexible belts and via risers to the two ends of the traverse of the subsequent cell.
  • this current distribution between the upstream and downstream end of the traverse based on the general current direction of the cell row, varies from 100-0% to 50-50%.
  • the vertical anode rods which carry the carbon anodes and feed with electrical current, are attached to the crossbar by means of locks.
  • the direct current initially flows through the series-connected cells of a row and then returns to the feeding rectifier unit in one or more neighboring cell rows.
  • the magnetic fields generated by rows of neighboring cells considerably disturb the desired magnetic symmetry of an electrolysis cell because they are added to its own magnetic fields in certain areas of the cell, but are subtracted in other areas.
  • the magnetic influence of the neighboring cell row produces a first flow component, a rotational movement along the inner cell walls, and has particularly damaging effects with regard to the stability of the electrolytic cell.
  • the direction of rotation of the rotation depends on whether the neighboring row of cells is on the left or right of the cell in relation to the general direction of the direct current.
  • the current distribution between the risers creates a second flow component, which consists in the fact that in each cell half, with respect to the longitudinal direction, in the area of the middle third of the cell, there is a rotation, the flow directions being opposite.
  • the asymmetrical rail arrangement is produced by connecting a different number of cathode bar ends to the busbars leading to the next cell on the opposite long sides of the cell, or by arranging the busbars at different distances from the long cell sides.
  • FR-PS 1 586 887 for example, five cathode bar ends are connected to the busbar 3 in FIG. 2, but only three cathode bar ends are connected to the busbar 4. Both busbars 3 and 4 lead to the downstream end of the traverse of the following cell. This arrangement creates an asymmetry which counteracts the magnetic action of the neighboring cell row.
  • busbars 3 shows an arrangement in which the busbars 3 are mounted higher than the busbars 4, which also leads to a desired asymmetry.
  • the inventor has set himself the task of creating an asymmetrical rail arrangement for longitudinal electrolysis cells, in particular for the production of aluminum, in which less metallic rail material has to be used and smaller losses of electrical energy occur.
  • This rail guide is said to be particularly suitable for an economical conversion of existing electrolysis cells.
  • the object is achieved according to the invention in that at least the busbars of a cell connected in the direction of the direct current of the cell row to the last cathode bar ends arranged on both sides of the cell longitudinal axis each lead to an upstream or downstream end of the traverse of the subsequent cells.
  • the asymmetry of rail arrangements is defined as the difference between the number of cathode bar ends, which is connected on each long side of the electrolysis cell to the current output side of the traverse of the subsequent cell, divided by the sum of the cathode bar ends.
  • the asymmetry is generated in that at least the busbar connected to the last cathode bar ends, preferably facing away from the neighboring cell row, leads to the upstream end of the traverse of the subsequent cell, while at least the busbar connected to the last cathode bar ends of the other longitudinal side of the cell to the downstream end of the next cell.
  • the busbars arranged on both sides of the electrolysis cell and connected to the last cathode bar ends never lead to the same End of the traverse, but one of these rails always to the upstream end, the other of these rails always to the downstream end.
  • the distribution of the cathode bar ends on the busbars running along the cells is advantageously the same on both long sides, e.g. five cathode bars are connected to first busbars lying on both long sides, five each to second busbars and four cathode bar ends to third busbars also arranged on both long sides.
  • the values for the asymmetry defined above are expediently between 0.05 and 0.4, preferably between 0.1 and 0.2.
  • the electrolysis cells 10 and 12 shown in FIG. 1 are picked out from a row of cells in an aluminum smelter.
  • the general direction of the direct electrical current is designated by 1. Only the ends 14 of the cathode bars arranged in the carbon base are visible, which protrude from the cells 10, 12.
  • the adjacent cell row runs according to FIG. 1 below the electrolytic cell, with the general direction of current from right to left.
  • the first five cathode bar ends 14 on both sides of the cells 10 and 12 in the current direction I are connected to first bus bars 16, the next five cathode bar ends 14 are connected to second bus bars 18 and the last four cathode bar ends are connected to third bus bars 20.
  • the first and second bus bars 16, 18 on both sides of the upstream end 24 of the traverse 22 of the subsequent cell 12, of the third busbars of the cell 10 only the one leading in the current direction I leads to the left, ie facing away from the row of neighboring cells to the upstream end 24 of the crossmember 22, while the one in the current direction on the right, i.e. third busbar 20 arranged facing the neighboring cell row leads to the downstream end 26 of the crossmember 22.
  • the asymmetry arises from the fact that a third riser 20 leads the current to the upstream end 24, but the other third riser 20 leads to the downstream end 26 of the traverse.
  • the asymmetry is 1/7 or 0.14.
  • FIG. 2 differs from FIG. 1 only by a smaller number of cathode bars (six instead of 14). 2 there is an asymmetry of 1/6 or 0.17.
  • FIG 3 shows an embodiment with nine cathode bars.
  • the asymmetry is 1/3 or 0.33.
  • the busbars 18 and 20 facing the neighboring cell row - as shown in FIG. 3 - lead to the traverse end 26;

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)
EP81810017A 1980-02-01 1981-01-23 Disposition asymétrique de barres d'amenée de courant pour cellules d'électrolyse Withdrawn EP0034117A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH813/80 1980-02-01
CH81380 1980-02-01

Publications (2)

Publication Number Publication Date
EP0034117A2 true EP0034117A2 (fr) 1981-08-19
EP0034117A3 EP0034117A3 (fr) 1981-08-26

Family

ID=4195782

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81810017A Withdrawn EP0034117A3 (fr) 1980-02-01 1981-01-23 Disposition asymétrique de barres d'amenée de courant pour cellules d'électrolyse

Country Status (7)

Country Link
US (1) US4261807A (fr)
EP (1) EP0034117A3 (fr)
AR (1) AR225489A1 (fr)
AU (1) AU6651881A (fr)
BR (1) BR8100591A (fr)
DE (1) DE3009096A1 (fr)
ZA (1) ZA81280B (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6551489B2 (en) 2000-01-13 2003-04-22 Alcoa Inc. Retrofit aluminum smelting cells using inert anodes and method
BR0108693B1 (pt) 2000-02-24 2012-01-24 método para retroajuste de uma célula de fusão de alumìnio.
CN100451177C (zh) * 2004-08-06 2009-01-14 贵阳铝镁设计研究院 非对称式槽底母线配置及电流配置方法
CN100439566C (zh) * 2004-08-06 2008-12-03 贵阳铝镁设计研究院 大面不等电式五点进电母线配置装置
CN102122537A (zh) * 2011-01-15 2011-07-13 株洲南车时代电气股份有限公司 一种复合母排及其组装方法
GB2542588B (en) * 2015-09-23 2019-04-03 Dubai Aluminium Pjsc Cathode busbar system for electrolytic cells arranged side by side in series
GB2549731A (en) * 2016-04-26 2017-11-01 Dubai Aluminium Pjsc Busbar system for electrolytic cells arranged side by side in series

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2105172A1 (fr) * 1970-09-01 1972-04-28 Alusuisse

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1586867A (fr) * 1968-06-28 1970-03-06
FR2333060A1 (fr) * 1975-11-28 1977-06-24 Pechiney Aluminium Procede et dispositif pour la compensation des champs magnetiques des files voisines de cuves d'electrolyse ignee placees en travers
FR2378107A1 (fr) * 1977-01-19 1978-08-18 Pechiney Aluminium Procede pour ameliorer l'alimentation en courant de cuves d'electrolyse alignees en long
NO139525C (no) * 1977-07-14 1979-03-28 Ardal Og Sunndal Verk Anordning for kompensering av horisontale magnetfelter i smelte-elektrolyseovner
FR2423554A1 (fr) * 1978-02-08 1979-11-16 Pechiney Aluminium Procede de reduction des perturbations magnetiques dans les series de cuves d'electrolyse a haute intensite

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2105172A1 (fr) * 1970-09-01 1972-04-28 Alusuisse

Also Published As

Publication number Publication date
EP0034117A3 (fr) 1981-08-26
AR225489A1 (es) 1982-03-31
BR8100591A (pt) 1981-08-18
ZA81280B (en) 1982-02-24
AU6651881A (en) 1981-08-06
DE3009096A1 (de) 1981-08-06
US4261807A (en) 1981-04-14

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Inventor name: BLANC, JEAN-MARC