EP0084142A2 - Procédé et dispositif pour l'alimentation en courant électrique de cuves pour la production électrolytique de métaux, spécialement d'aluminium - Google Patents

Procédé et dispositif pour l'alimentation en courant électrique de cuves pour la production électrolytique de métaux, spécialement d'aluminium Download PDF

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Publication number
EP0084142A2
EP0084142A2 EP82111772A EP82111772A EP0084142A2 EP 0084142 A2 EP0084142 A2 EP 0084142A2 EP 82111772 A EP82111772 A EP 82111772A EP 82111772 A EP82111772 A EP 82111772A EP 0084142 A2 EP0084142 A2 EP 0084142A2
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EP
European Patent Office
Prior art keywords
conductors
pot
plane
points
current
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
EP82111772A
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German (de)
English (en)
Other versions
EP0084142A3 (en
EP0084142B1 (fr
Inventor
Giancarlo C/O Alluminio Italia S.P.A. Solinas
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.)
Aluminia SpA
Original Assignee
Alluminio Italia SpA
Aluminia SpA
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
Priority claimed from IT19155/82A external-priority patent/IT1200568B/it
Priority claimed from IT19154/82A external-priority patent/IT1200585B/it
Application filed by Alluminio Italia SpA, Aluminia SpA filed Critical Alluminio Italia SpA
Publication of EP0084142A2 publication Critical patent/EP0084142A2/fr
Publication of EP0084142A3 publication Critical patent/EP0084142A3/en
Application granted granted Critical
Publication of EP0084142B1 publication Critical patent/EP0084142B1/fr
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 method and relevant apparatus for the electric current supply to pots for the electrolytic production of metals, in particular for the production of aluminium, said pots being connected in series and arranged transversally or longitudinally.
  • aluminium is commercially produced in pots electrically connected in series by electrolytic reduction of alumina dissolved in molten cryolite, each of said pots essentially consisting of a rectangular crucible having the cathode (formed by joined carbon blocks which embody iron cathode bars) on the bottom, while the anodes ( consisting of separate carbon blocks connected by iron yokes to aluminium anode rods) hang vertically over each pot and are im- merged in the elctrolytic molten bath of cryo lite-alumina.
  • the aluminium produced by electrolysis deposits onto the cathode, under said molten bath.
  • the electrical connection in series is accomplished by connecting, by means of aluminium conductor bars, the cathode outputs of an upstream pot with the anode bus bar of the adjoining downstream pot, said upstream and downstream positions being referred - as is usually conventional - .to the prevailing current direction in the pot-line.
  • the pots of the pot-line are arranged, from a geometrical point of view, on one or more parallel rows, and are oriented in each of such rows in a so-called end-to-end relationship, or in a so-called side-by-side relationship, depending on whether the long side of said pots is arranged parallelly or perpendicularly to the predominant direction of the current in the series.
  • Each of the two arrangements exhibits own typical known advantages and draw backs of various kind ,but for both said arrangements the electric current carried by whole conductor system (i.e.:the anodes,the molten electrolyte and metal,the- cathodes and the outer bus bar system) generates magnetic fields of comparatively high intensity, which cause in the electrolysis bath as well as in the molten metal, due to the interaction with the current flowing through said fluids, forces of electromagnetic nature dissymetrically distributed.
  • whole conductor system i.e.:the anodes,the molten electrolyte and metal,the- cathodes and the outer bus bar system
  • the object of this invention is to provide an improved method and a relevant apparatus for the electric current supply to pots for the electrolytic production of metals, in particular aluminium, capr- able of minimizing the detrimental effects of the magnetic forces acting 6n the electrolysis pots, said pots being electrically connected in series, and arranged side-by-side or end-to-end on one row or more rows.
  • the double symmetrical current paths so provided permit to obtain a high compensation and the total symmetrization (with respect to both median vertical planes of said pots) of the magnetic field components and, by consequence, a total symmetrization of the magnetic forces induced by the interaction of said magnetic field with the pot current.
  • FIG. 1 schematically show some arrangements of the conductors intended for carrying the current in plants for the electrolytic production of metals, in particular aluminium, figures 1 to 3 and 12 to 14 referring to conventional arrangements, while figures 4 to 11 and 15 to 18 refer to arrangements according to the pres ent invention. More particularly, with reference to the side-by-side pots :
  • the magnetic forces F which influence the behaviour of an electrolytic pot are generated by the interaction of the magnetic induction field B creat ed by the currents flowing through the outer and inner conductors(in respect of the pot),with the current density field J existing inside the molten areas of the pot ( more specifically : bath and metal.) according to the vectorial relationship ⁇ ⁇ ⁇ wherein both F and J and B are intended in general to be functions of the point of observation, being such point referred - in the present case - to an orthogonal reference system having the center coinciding with the center of the cathode plane of the pot (metal bottom), the x axis directed as the general flow of the current in the potline, the y axis arranged at 90° counter clockwise and the z axis directed upwards.
  • a possible dissymmetry in the magnetic force field F in said cavity is therefore substantially ascribable to field B .
  • Such dissymmetry is a consequence, in turn, of the dissymmetry of the outer conductor bus bar system of the pot, since the inner conductors ( from the anode rod system to the cathode block) are usually symmetrically arranged.
  • the second type of dissymmetry is conversely due to the non-symmetrical arrangement of the conductor bus bars and of the currents with respect to the plane yz,i.e.to the median vertical plane of the single pot perpendicular to the direction of the current in the row ("longitudinal plane” for transversally arranged pots and “transversal plane” for longitudinally arranged pots), and causes an unbalance of field B between the upstream and the down stream halves of the pot.
  • the level at which said lower plane is positioned has no relevant influence on the distribution and magnitude of the magnetic forces in the bath and in the metal, at least from a certain value onward.
  • the difference - in terms of induced forces - is minimum from a level of -1.5 m to a level of -2.0 m with respect to the plane xy.
  • the present invention which is mainly and predominantly deviced for plants equipped with sin gle reverse conductors symmetrically arranged side--by-side to feeding conductors, can be advantageously applied also to plants in which the potline, arranged on two or more parallel rows (figures 1 and 12)does not have,according to the conventional schemes said reverse conductors arranged in countercurrent.
  • the benefits induced by the symmetrical arrangement of the cathode bus bars around a single pot are attenuated due to the permanence of asymmetries in the magnetic field, and by consequence in the field of forces, with respect to the median vertical planes of the pot.
  • the optional positioning of the aforesaid conductors underneath the pot bottom ensures in any case - as compared with the conventional known plants - a sensible reduction of the vertical magnetic field.
  • the symmetrical arrangement of the conductors according to the present invention always provides the advantages indicated at points I) through V) hereinabove also in the case of plants in which the potline is arranged on two or more rows and the circuit does not have single reverse cond uctors arranged side-by-side symmetrically to the feed ing conductors.
  • each single conductor may be splitted into two conductors, each of which having a cross-section equal to half of said single conductor.

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)
EP19820111772 1982-01-18 1982-12-18 Procédé et dispositif pour l'alimentation en courant électrique de cuves pour la production électrolytique de métaux, spécialement d'aluminium Expired EP0084142B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
IT1915582 1982-01-18
IT1915482 1982-01-18
IT19155/82A IT1200568B (it) 1982-01-18 1982-01-18 Metodo ed apparato per l'alimentazione elettrica di celle per la produzione elettrolitica di metalli,disposte per lungo
IT19154/82A IT1200585B (it) 1982-01-18 1982-01-18 Metodo ed apparato per l'alimentazione elettrica di celle per la produzione elettrolitica dimetalli disposte per traverso

Publications (3)

Publication Number Publication Date
EP0084142A2 true EP0084142A2 (fr) 1983-07-27
EP0084142A3 EP0084142A3 (en) 1983-08-03
EP0084142B1 EP0084142B1 (fr) 1987-06-10

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820111772 Expired EP0084142B1 (fr) 1982-01-18 1982-12-18 Procédé et dispositif pour l'alimentation en courant électrique de cuves pour la production électrolytique de métaux, spécialement d'aluminium

Country Status (2)

Country Link
EP (1) EP0084142B1 (fr)
DE (1) DE3276543D1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0204647A1 (fr) * 1985-06-05 1986-12-10 Aluminium Pechiney Dispositif de connexion entre cuves d'électrolyse à tres haute intensité pour la production d'aluminium, comportant un circuit d'alimentation et un circuit indépendant de correction du champ magnétique
EP0787833A1 (fr) * 1996-01-26 1997-08-06 Alusuisse Technology & Management AG Disposition d'amenées de courant pour cellules d'électrolyse
CN103114307A (zh) * 2011-11-16 2013-05-22 沈阳铝镁设计研究院有限公司 铝电解槽外补偿供电整流机组铝母线布置方法及系统
GB2563641A (en) * 2017-06-22 2018-12-26 Dubai Aluminium Pjsc Electrolysis plant using the Hall-Héroult process, with vertical magnetic field compensation
CN110392750A (zh) * 2017-12-29 2019-10-29 俄铝工程技术中心有限责任公司 用于铝电解槽系列的模块化母线系统

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1049108B (de) * 1953-02-05 1959-01-22 Elektrokemisk As Anordnung von Stromschienen fuer Elektrolysezellen
DE1161695B (de) * 1957-01-05 1964-01-23 Pechiney Prod Chimiques Sa Anordnung von Stromzufuehrungen zum Unterdruecken der magnetischen Effekte bei der Schmelzfluss-Elektrolyse von Aluminium
FR2378107A1 (fr) * 1977-01-19 1978-08-18 Pechiney Aluminium Procede pour ameliorer l'alimentation en courant de cuves d'electrolyse alignees en long
US4169034A (en) * 1978-05-11 1979-09-25 Aluminium Pechiney Means of compensating the magnetic field induced by the adjacent line in series of high intensity electrolysis cells
US4210514A (en) * 1978-02-08 1980-07-01 Aluminum Pechiney Process for reducing the magnetic disturbances in series of high-intensity electrolysis tanks

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1049108B (de) * 1953-02-05 1959-01-22 Elektrokemisk As Anordnung von Stromschienen fuer Elektrolysezellen
DE1161695B (de) * 1957-01-05 1964-01-23 Pechiney Prod Chimiques Sa Anordnung von Stromzufuehrungen zum Unterdruecken der magnetischen Effekte bei der Schmelzfluss-Elektrolyse von Aluminium
FR2378107A1 (fr) * 1977-01-19 1978-08-18 Pechiney Aluminium Procede pour ameliorer l'alimentation en courant de cuves d'electrolyse alignees en long
US4210514A (en) * 1978-02-08 1980-07-01 Aluminum Pechiney Process for reducing the magnetic disturbances in series of high-intensity electrolysis tanks
US4169034A (en) * 1978-05-11 1979-09-25 Aluminium Pechiney Means of compensating the magnetic field induced by the adjacent line in series of high intensity electrolysis cells

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0204647A1 (fr) * 1985-06-05 1986-12-10 Aluminium Pechiney Dispositif de connexion entre cuves d'électrolyse à tres haute intensité pour la production d'aluminium, comportant un circuit d'alimentation et un circuit indépendant de correction du champ magnétique
FR2583069A1 (fr) * 1985-06-05 1986-12-12 Pechiney Aluminium Dispositif de connexion entre cuves d'electrolyse a tres haute intensite, pour la production d'aluminium, comportant un circuit d'alimentation et un circuit independant de correction du champ magnetique
EP0787833A1 (fr) * 1996-01-26 1997-08-06 Alusuisse Technology & Management AG Disposition d'amenées de courant pour cellules d'électrolyse
US5830335A (en) * 1996-01-26 1998-11-03 Alusuisse Technology & Management Ltd. Busbar arrangement for electrolytic cells
CN103114307A (zh) * 2011-11-16 2013-05-22 沈阳铝镁设计研究院有限公司 铝电解槽外补偿供电整流机组铝母线布置方法及系统
CN103114307B (zh) * 2011-11-16 2015-11-04 沈阳铝镁设计研究院有限公司 铝电解槽外补偿供电整流机组铝母线布置方法及系统
GB2563641A (en) * 2017-06-22 2018-12-26 Dubai Aluminium Pjsc Electrolysis plant using the Hall-Héroult process, with vertical magnetic field compensation
CN110392750A (zh) * 2017-12-29 2019-10-29 俄铝工程技术中心有限责任公司 用于铝电解槽系列的模块化母线系统
EP3643813A4 (fr) * 2017-12-29 2020-07-29 Obshchestvo S Ogranichennoy Otvetstvennost'yu "Obedinennaya Kompaniya Rusal Inzhenerno-Tekhnologicheskiy Tsentr" Aménagement modulaire de bus pour séries de cellules d'électrolys d'aluminium
CN110392750B (zh) * 2017-12-29 2023-07-21 俄铝工程技术中心有限责任公司 用于铝电解槽系列的模块化母线系统

Also Published As

Publication number Publication date
EP0084142A3 (en) 1983-08-03
DE3276543D1 (en) 1987-07-16
EP0084142B1 (fr) 1987-06-10

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