EP0003712B1 - Procédé de réduction des perturbations magnétiques dans les séries de cuves d'électrolyse à haute intensité - Google Patents

Procédé de réduction des perturbations magnétiques dans les séries de cuves d'électrolyse à haute intensité Download PDF

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Publication number
EP0003712B1
EP0003712B1 EP79420008A EP79420008A EP0003712B1 EP 0003712 B1 EP0003712 B1 EP 0003712B1 EP 79420008 A EP79420008 A EP 79420008A EP 79420008 A EP79420008 A EP 79420008A EP 0003712 B1 EP0003712 B1 EP 0003712B1
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EP
European Patent Office
Prior art keywords
tanks
tank
way
equal
supplied
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.)
Expired
Application number
EP79420008A
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German (de)
English (en)
French (fr)
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EP0003712A1 (fr
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/fr
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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 long, high-intensity electrolytic 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 own 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.
  • the upstream and downstream positions are designated by reference to the conventional direction of the current in the series.
  • dB Y ° is the gradient of this potential along the vertical axis at the center dz of the chip.
  • the set of forces f 1 (x) on a parallel to Ox (of abscissa y) in the first quarter is: because jy is constant due to the usual arrangement of cathode bars with transverse outputs; the same is true of j z .
  • B z (M) and B z (o) are zero, the value of B l on the Oy axis does not exceed 2 to 3. 10- 4 TESLA, for a tank of 100,000 amperes, which is negligible.
  • 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 1 (x) is about three times larger than the set of negative forces - F 2 (x), from Not.
  • 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.
  • 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.
  • h is the height of the spider above the xOy reference plane.
  • N.B. The sign ⁇ means that this rating is valid for negative conductors placed on each side of the tank.
  • FIG. 7 is, in fact, a transverse half-soup 1 of a tank in length, passing through the central point O.
  • the lines bordered by hatching indicate the external dimensions of the box of tank.
  • Head A upstream receives an intensity ⁇ l
  • head B downstream receives (1 - ⁇ ) 1
  • Equations (10) and (11) are identical to (2) and (5), namely:
  • curve 1 represents the variation of b z (tank) with no neighboring line, 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 1 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 schematic sectional view of an electrolysis room (1) comprising two adjacent rows, 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.
  • 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.
  • This method therefore makes it possible to minimize the investment cost, and the consumption of the compensating conductor.
  • the curve I in dotted lines corresponds to the solution of case n ° 1
  • the curve 2 in solid line corresponds to the solution taking into account the neighboring file.
  • the neighboring queue is taken into account.
  • Equation (19) giving z is the same as (16) with the new values of ⁇ ' 1 and ⁇ ' 1 :
  • the current distribution coefficient ⁇ 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 Procédé de réduction des perturbations magnétiques dans les séries de cuves d'électrolyse à haute intensité Expired EP0003712B1 (fr)

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 EP0003712A1 (fr) 1979-08-22
EP0003712B1 true EP0003712B1 (fr) 1982-01-27

Family

ID=9204598

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79420008A Expired EP0003712B1 (fr) 1978-02-08 1979-02-02 Procédé de réduction des perturbations magnétiques dans les séries de cuves d'électrolyse à haute intensité

Country Status (22)

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

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 (xx) * 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

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL186581B (nl) 1954-02-09 1900-01-01 Roquette Freres Produkt dat gehydrogeneerd zetmeel-hydrolysaat bevat en werkwijze ter bereiding daarvan.
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
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
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 (xx) * 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
CH527909A (de) * 1970-05-01 1972-09-15 Alusuisse Aluminium-Elektrolysezelle
JPS5216843B2 (xx) * 1973-10-26 1977-05-12
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
PL115407B3 (en) * 1976-03-08 1981-04-30 Pechiney Aluminium Method and apparatus for compensation of magnetic fields of adjoining rows of thermo-electrolyzer tanks
FR2378107A1 (fr) * 1977-01-19 1978-08-18 Pechiney Aluminium Procede pour ameliorer l'alimentation en courant de cuves d'electrolyse alignees en long

Also Published As

Publication number Publication date
EP0003712A1 (fr) 1979-08-22
IT7919974A0 (it) 1979-02-07
FR2423554A1 (fr) 1979-11-16
DE2961926D1 (en) 1982-03-11
JPS585269B2 (ja) 1983-01-29
IS2477A7 (is) 1979-05-11
ES477486A1 (es) 1979-07-16
IN151090B (xx) 1983-02-19
IT1110960B (it) 1986-01-13
YU25879A (en) 1982-06-30
YU42943B (en) 1989-02-28
AU4398279A (en) 1979-08-16
PL213230A1 (xx) 1980-04-08
NO152223C (no) 1985-08-21
NZ189577A (en) 1982-09-14
RO76940A (ro) 1981-06-22
AU526414B2 (en) 1983-01-06
ATA95879A (de) 1983-06-15
NO152223B (no) 1985-05-13
JPS54116309A (en) 1979-09-10
GR66432B (xx) 1981-03-23
ZA79537B (en) 1980-02-27
US4210514A (en) 1980-07-01
AT373631B (de) 1984-02-10
IS1298B6 (is) 1987-11-25
NO790383L (no) 1979-08-09
OA06184A (fr) 1981-06-30
FR2423554B1 (xx) 1981-01-16
CA1120422A (fr) 1982-03-23
CH641842A5 (fr) 1984-03-15
PL117122B1 (en) 1981-07-31
BR7900751A (pt) 1979-08-28

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