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EP0003712A1 - Verfahren zum Unterdrücken der magnetischen Störungen in Reihen von Elektrolyseöfen mit hohen Stromstärken - Google Patents

Verfahren zum Unterdrücken der magnetischen Störungen in Reihen von Elektrolyseöfen mit hohen Stromstärken Download PDF

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Publication number
EP0003712A1
EP0003712A1 EP79420008A EP79420008A EP0003712A1 EP 0003712 A1 EP0003712 A1 EP 0003712A1 EP 79420008 A EP79420008 A EP 79420008A EP 79420008 A EP79420008 A EP 79420008A EP 0003712 A1 EP0003712 A1 EP 0003712A1
Authority
EP
European Patent Office
Prior art keywords
tank
series
electrolytic cells
current
tanks
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
EP79420008A
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English (en)
French (fr)
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EP0003712B1 (de
Inventor
Paul Morel
Jean-Pierre Dugois
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 France SAS
Original Assignee
Aluminium Pechiney SA
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 Aluminium Pechiney SA filed Critical Aluminium Pechiney SA
Publication of EP0003712A1 publication Critical patent/EP0003712A1/de
Application granted granted Critical
Publication of EP0003712B1 publication Critical patent/EP0003712B1/de
Expired 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 a new method for reducing magnetic disturbances in the series of high intensity long electrolysed cells, intended for the production of aluminum by electrolysis of alumina dissolved in molten cryolite. It applies to the reduction of disturbances due to the clean field created by each tank and by its neighbors in the same queue and the adjacent queue when the latter is at a distance relatively close to the queue considered.
  • Laplace forces which develop in metal are the source of the deformation of the bath-metal interface.
  • B x , B and B being the three components of the magnetic field B along the xyz axes Ox, Oy, Oz, j, j and j being the three components of the density of xyz current in the metal.
  • the set of forces f 1 (x) on a parallel to Ox (of abscissa y) in the first quarter is: because is constant due to the usual arrangement of cathode bars with transverse outputs; the same is true of j z .
  • B (M) and B (o) are zero, the value of B on the Oy axis does not exceed 2 at 3.10 -4 TESLA, for a tank of 100,000 amperes, which is negligible.
  • the curve of B on each axis is then also asymmetric.
  • FIG. 4 represents, in the case of a conventional tank of 115,000 amperes, and in correspondence with FIG. 3: in solid lines, the asymmetrical dome shape, and large arrow (up to 4 cm) in the case of '' an asymmetrical curve B z (solid line) and the symmetrical dome shape with a small arrow (about 1 cm) in the case where B z is asymmetrical with respect to the axis Oy, that is to say after setting in work of the invention.
  • the asymmetric force comes, in the first case, from the fact that the set of positive forces from R to P, F (x) is about three times more
  • the invention applies to long tanks fed either by the two heads or by the upstream head and at least one lateral rise on each side.
  • the negative conductors (connecting conductors between the tanks) are arranged symmetrically with respect to the median plane xOz. Referring to Figure 1, denote by Y and Z the coordinates of these conductors in the xOz plane.
  • the field of the neighboring queue is compensated by means of an auxiliary conductor disposed along each queue in which a direct current is circulated in the opposite direction to that of the circulating current in line, and whose intensity is provided by the resolution of a system of equations taking into account the various magnetic influences on each tank.
  • k 1 is an experimental coefficient which takes account of the fact that the cross is formed, in practice, of two branches and of the discontinuity duejj to the interval between the crosses of each tank of a file. k 1 is almost always close to 0.9 and we will keep this value later.
  • h is the height of the spider above the xOy reference plane.
  • B y ° is equal to: b y ° (crosspiece) + b y ° (manifold 1) + b y ° (manifold 2) and must be equal to 0.
  • Case n ° 2 Classic tanks (figure 6) supplied by the two heads of the spider. No neighboring queue. Head A (upstream) receives an intensity a I, head B (downstream) receives (1 - a) I.
  • curve 1 represents the variation of b (tank) without z neighboring file, along MON
  • curve 2 represents the variation of b z (neighboring file) along MON
  • curve 3 represents the variation of B z (tank + neighboring file) along MON
  • the method which we will now describe uses a compensation conductor traversed by a current -i which flows in the opposite direction to the current I of the series, located on the outside of the two rows of tanks, and placed at a minimum distance from the box, compatible with electrical safety.
  • FIG. 12 is a diagrammatic section of an electrolysis room (1) comprising two adjacent lines, of which only the anode systems 2 and 3 have been shown, and, in which the cells are arranged lengthwise.
  • the compensation conductors are in 4 and 5.
  • the connection conductors of the tanks are omitted so as not to overload the drawing.
  • the rounded arrows schematize the directions of the magnetic field created by each compensating conductor.
  • K l and d are values fixed during construction and practically independent of the size of the tanks.
  • e and f are directly proportional to i, and the values of m, E and F will therefore also be proportional to i.
  • the distance d was reduced to 1.20 m (this reduction is only possible if the arrangement of the tanks allows it). This results in a significant reduction in the intensity i in the compensation conductor.
  • a zero total field B z will be obtained by using a compensation conductor traversed by a current i which will be a function of its distance from the outside edge of the anode.
  • a current i which will be a function of its distance from the outside edge of the anode.
  • This method therefore makes it possible to minimize the investment cost, and the consumption of the compensating conductor.
  • condition B (M) is modified: z
  • the neighboring queue is taken into account.
  • Equation (19) giving z is the same as (16) with the new values
  • the coefficient a current distribution equal to or less than 0.55 in the case of tanks fed by a head and at least one central rise on each side, and preferably between 0.45 and 0.55, equal to or less than 0.75 in the case of conventional tanks supplied by the two heads, and preferably between 0.75 and 0.65.

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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)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Spectrometry And Color Measurement (AREA)
  • Endoscopes (AREA)
EP79420008A 1978-02-08 1979-02-02 Verfahren zum Unterdrücken der magnetischen Störungen in Reihen von Elektrolyseöfen mit hohen Stromstärken Expired EP0003712B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7804193A FR2423554A1 (fr) 1978-02-08 1978-02-08 Procede de reduction des perturbations magnetiques dans les series de cuves d'electrolyse a haute intensite
FR7804193 1978-02-08

Publications (2)

Publication Number Publication Date
EP0003712A1 true EP0003712A1 (de) 1979-08-22
EP0003712B1 EP0003712B1 (de) 1982-01-27

Family

ID=9204598

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79420008A Expired EP0003712B1 (de) 1978-02-08 1979-02-02 Verfahren zum Unterdrücken der magnetischen Störungen in Reihen von Elektrolyseöfen mit hohen Stromstärken

Country Status (22)

Country Link
US (1) US4210514A (de)
EP (1) EP0003712B1 (de)
JP (1) JPS585269B2 (de)
AT (1) AT373631B (de)
AU (1) AU526414B2 (de)
BR (1) BR7900751A (de)
CA (1) CA1120422A (de)
CH (1) CH641842A5 (de)
DE (1) DE2961926D1 (de)
ES (1) ES477486A1 (de)
FR (1) FR2423554A1 (de)
GR (1) GR66432B (de)
IN (1) IN151090B (de)
IS (1) IS1298B6 (de)
IT (1) IT1110960B (de)
NO (1) NO152223C (de)
NZ (1) NZ189577A (de)
OA (1) OA06184A (de)
PL (1) PL117122B1 (de)
RO (1) RO76940A (de)
YU (1) YU42943B (de)
ZA (1) ZA79537B (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO144675C (no) * 1979-07-24 1981-10-14 Ardal Og Sunndal Verk Anordning for kompensering av skadelig magnetisk paavirkning mellom to eller flere rekker av langsstilte elektrolyseovner for smelte-elektrolytisk fremstilling av metall, for eksempel aluminium
DE3009158A1 (de) * 1980-02-01 1981-08-06 Schweizerische Aluminium AG, 3965 Chippis Schienenanordnung fuer elektrolysezellen
DE3009096A1 (de) * 1980-02-01 1981-08-06 Schweizerische Aluminium AG, 3965 Chippis Asymmetrische schienenanordnung fuer elektrolysezellen
DE3276543D1 (en) * 1982-01-18 1987-07-16 Aluminia Spa Method and apparatus for electric current supply of pots for electrolytic production of metals, particularly aluminium
JPS63183843U (de) * 1987-05-19 1988-11-25
RU2316619C1 (ru) * 2006-04-18 2008-02-10 Общество с ограниченной ответственностью "Русская инжиниринговая компания" Устройство для компенсации магнитного поля, наведенного соседним рядом последовательно соединенных электролизеров большой мощности
GB2563641A (en) * 2017-06-22 2018-12-26 Dubai Aluminium Pjsc Electrolysis plant using the Hall-Héroult process, with vertical magnetic field compensation

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1079131A (fr) 1954-02-09 1954-11-25 Pechiney Dispositifs pour cellules d'électrolyse à ampérage élevé
FR1143879A (fr) 1956-02-28 1957-10-07 Pechiney Procédé pour diminuer ou supprimer les dénivellations du métal fondu dans les cellules d'électrolyse à ampérage élevé
FR1185548A (fr) 1957-10-29 1959-07-31 Elektrokemisk As Dispositif pour l'amenée de courant aux fours pour la production d'aluminium par fusion électrolytique
FR1586867A (de) 1968-06-28 1970-03-06
US3616317A (en) 1969-09-29 1971-10-26 Alcan Res & Dev Aluminum pot line and method of operating same
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

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1164362A (fr) * 1957-01-05 1958-10-08 Pechiney Procédé pour supprimer les dénivellations du métal fondu et pour réduire les mouvements d'agitation du liquide dans les cellules d'électrolyse
CH527909A (de) * 1970-05-01 1972-09-15 Alusuisse Aluminium-Elektrolysezelle
JPS5216843B2 (de) * 1973-10-26 1977-05-12
US4090930A (en) * 1976-03-08 1978-05-23 Aluminum Pechiney Method of and an apparatus for compensating the magnetic fields of adjacent rows of transversely arranged igneous electrolysis cells
FR2378107A1 (fr) * 1977-01-19 1978-08-18 Pechiney Aluminium Procede pour ameliorer l'alimentation en courant de cuves d'electrolyse alignees en long

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1079131A (fr) 1954-02-09 1954-11-25 Pechiney Dispositifs pour cellules d'électrolyse à ampérage élevé
FR1143879A (fr) 1956-02-28 1957-10-07 Pechiney Procédé pour diminuer ou supprimer les dénivellations du métal fondu dans les cellules d'électrolyse à ampérage élevé
FR1185548A (fr) 1957-10-29 1959-07-31 Elektrokemisk As Dispositif pour l'amenée de courant aux fours pour la production d'aluminium par fusion électrolytique
FR1586867A (de) 1968-06-28 1970-03-06
US3616317A (en) 1969-09-29 1971-10-26 Alcan Res & Dev Aluminum pot line and method of operating same
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

Also Published As

Publication number Publication date
DE2961926D1 (en) 1982-03-11
US4210514A (en) 1980-07-01
IS1298B6 (is) 1987-11-25
EP0003712B1 (de) 1982-01-27
FR2423554A1 (fr) 1979-11-16
YU42943B (en) 1989-02-28
RO76940A (ro) 1981-06-22
CA1120422A (fr) 1982-03-23
GR66432B (de) 1981-03-23
CH641842A5 (fr) 1984-03-15
NO790383L (no) 1979-08-09
AU4398279A (en) 1979-08-16
IT7919974A0 (it) 1979-02-07
JPS585269B2 (ja) 1983-01-29
OA06184A (fr) 1981-06-30
ATA95879A (de) 1983-06-15
ES477486A1 (es) 1979-07-16
NO152223C (no) 1985-08-21
BR7900751A (pt) 1979-08-28
NZ189577A (en) 1982-09-14
PL117122B1 (en) 1981-07-31
NO152223B (no) 1985-05-13
YU25879A (en) 1982-06-30
IS2477A7 (is) 1979-05-11
ZA79537B (en) 1980-02-27
PL213230A1 (de) 1980-04-08
FR2423554B1 (de) 1981-01-16
IN151090B (de) 1983-02-19
AU526414B2 (en) 1983-01-06
AT373631B (de) 1984-02-10
IT1110960B (it) 1986-01-13
JPS54116309A (en) 1979-09-10

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