EP1774062B1 - Abstreifer für einen bohrkugel zum bohren der badkruste in einer aluminium-reduktionszelle - Google Patents

Abstreifer für einen bohrkugel zum bohren der badkruste in einer aluminium-reduktionszelle Download PDF

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Publication number
EP1774062B1
EP1774062B1 EP05778797A EP05778797A EP1774062B1 EP 1774062 B1 EP1774062 B1 EP 1774062B1 EP 05778797 A EP05778797 A EP 05778797A EP 05778797 A EP05778797 A EP 05778797A EP 1774062 B1 EP1774062 B1 EP 1774062B1
Authority
EP
European Patent Office
Prior art keywords
scraper
fingers
crust
crust breaking
axis
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.)
Not-in-force
Application number
EP05778797A
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English (en)
French (fr)
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EP1774062A2 (de
Inventor
Bernard Bourges
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.)
Fives ECL SAS
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ECL SAS
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Filing date
Publication date
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Publication of EP1774062A2 publication Critical patent/EP1774062A2/de
Application granted granted Critical
Publication of EP1774062B1 publication Critical patent/EP1774062B1/de
Not-in-force 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
    • C25C3/14—Devices for feeding or crust breaking

Definitions

  • the invention relates to electrolysis cell equipment for the production of aluminum by igneous electrolysis according to the Hall-Héroult method. It relates in particular to devices for piercing solidified bath crusts of said electrolysis cells.
  • Alumina and bath compounds are generally introduced into the bath in powder form.
  • the electrolysis cells are equipped with one or more distributors of pulverulent materials associated with a device for piercing the crust of alumina and fixed electrolyte which covers the bath surface in normal operation.
  • the piercing device generally comprises a jack and a piercing member (often called “piercer", “plunger” or “chisel”) attached to the end of the stem of the cylinder.
  • the breaker usually placed vertically, is lowered by activation of the cylinder and breaks the crust of alumina and solidified bath.
  • the stitching devices also include, in general, a scraper for removing solidified bath deposits that tend to form on the stingers.
  • the solidified bath sometimes forms an envelope on the surface of the piercing member which can block the member in the scraper.
  • the applicant has sought ways to avoid this inconvenience.
  • the subject of the invention is a scraper of a piercing member (such as a piercer, a plunger or a chisel) that can be used to form an opening in a crust of alumina and solidified bath of an igneous electrolysis cell. by a back and forth movement of the piercing member along a translation axis T.
  • a piercing member such as a piercer, a plunger or a chisel
  • the scraper according to the invention is characterized in that it comprises at least three fingers arranged around a reference axis S intended to coincide with said translation axis T in use so as to form a space, called "relief", between the fingers and the piercing member, and in that each finger comprises at least one scraper member projecting towards the piercing member.
  • the applicant has had the idea of breaking down the scraper into a set of scraping members, separated from one another, to reduce the contact surface with the scraper and to arrange the scraping members on a plurality of fingers angularly separated from each other. each other.
  • This approach makes it possible to prevent the blocking of the piercing member by limiting the force required to disengage it in the event of accumulation of bath crust between the scraping members and the piercing member.
  • the applicant has had the idea of substantially move the fingers of the piercing member of the piercing device to promote the accumulation of bath crust debris above the scraping members, rather than their insertion. between the sheath and the piercing member. The accumulated debris can easily be evacuated by the space formed by the gap between the scraper fingers.
  • the invention is particularly suitable for electrolysis cells intended for the production of aluminum.
  • the invention also relates to a drilling device for an aluminum production cell by igneous electrolysis and comprising a scraper according to the invention.
  • the invention also relates to a metering pusher for an aluminum production cell by igneous electrolysis and comprising a scraper according to the invention.
  • the invention further relates to a quilting and measuring device for an aluminum production cell by igneous electrolysis and comprising a scraper according to the invention.
  • the invention further relates to the use of the scraper according to the invention in an electrolysis cell for the production of aluminum by igneous electrolysis.
  • an electrolysis cell (1) for the production of aluminum by igneous electrolysis that is to say by molten salt electrolysis, comprises a tank (2), one or more anodes (3) - typically anodes precursors of carbonaceous material - and pulverulent feed means (20, 30), which are generally attached to a superstructure (4) disposed above the vessel.
  • the electrolytic cell (2) comprises inner lining elements (not shown) and a cathode assembly (5) which form inside the tank (2) a crucible adapted to contain the electrolyte bath (7) and a sheet of liquid aluminum (6) when the cell is in operation.
  • the anodes (3) are normally partially immersed in the liquid electrolyte bath (7) and the cells are conducted to form a crust of alumina and solidified bath (10) above the electrolyte bath.
  • the pulverulent feed means (20, 30) generally comprise a powder dispenser (20) and a piercing device (30).
  • the powder dispenser (20) typically comprises a hopper (21) for containing a supply of pulverulent material, and a chute (22) attached to the bottom of the hopper and for conveying the pulverulent material to the vicinity. an opening (11) in the crust (10).
  • the piercing device (30) includes an actuator (31) and a piercing member (33) (often referred to as a "breaker", “plunger” or “chisel") attached to the end of the actuator stem, which is typically located in a sheath or sheath (32).
  • the piercing member (33) is generally arranged to enter and exit the piercing device (30) through an opening at the free end (34) of the sheath or sheath (32).
  • the piercing member (33) makes it possible to form an opening (11) in a crust (10) of alumina and bath solidified by a back and forth movement of the piercing member (33) along the a translation axis T, which is typically vertical or slightly inclined relative to the vertical.
  • the cross section of the piercing member (33) is typically circular.
  • the actuator (31) is typically a pneumatic actuator, such as a pneumatic cylinder.
  • a scraper (40) ensures the cleaning of the piercing member during its movements back and forth
  • a dispenser of powdery materials may be associated with one or more determined stitching devices or, conversely, a stitching device may be associated with one or more dispensers of powdered materials determined.
  • the electrolysis cells are frequently provided with one or more devices comprising a distributor of pulverulent materials and a stitching device. These devices are known as stitching and feeding devices ("Crustbreaking and Feeding Device").
  • At least one opening (11) is formed (or possibly kept open) in said crust (10), between the anodes (3), with the aid of the piercing device (s) (30) and the pulverulent material is introduced into the bath electrolyte (7) through the opening (11) (or at least one opening when there are several).
  • the scraper (40) comprises a plurality of fingers (42) arranged around a reference axis S intended to be coincident with said translation axis T in use.
  • the fingers (42) are arranged to release a space (44), called “relief” between the fingers (42) and the piercing member (33).
  • Each finger (42) comprises at least one scraper member (43) projecting towards the piercing member (33).
  • FIGS. 2 to 6 illustrate a preferred embodiment of a scraper according to the invention.
  • the scraper (40) comprises at least three fingers (42) and preferably at least six fingers.
  • the number of fingers is typically between 6 and 10 inclusive.
  • the exemplary embodiment of the invention illustrated in Figures 3 to 6 has six fingers.
  • the length L1 of the fingers (42) is preferably greater than 100 mm.
  • the fingers (42) are arranged to form a gap, called “spacing", (422, 423) between them.
  • the cross section of the fingers (42) is advantageously substantially uniform over at least 50% of their length L1 in order to maintain, over a significant length, a spacing (422, 423) between the fingers sufficient to allow easy evacuation of the crust debris baths torn off by scraping devices (43).
  • the fingers (42) are preferably straight and parallel to the reference axis S of the scraper.
  • the distance Cm between the points closest to the surface of the adjacent fingers is preferably greater than 10 mm, and more preferably greater than 20 mm, at least 50% of their length L1.
  • the gap C between the adjacent fingers preferably increases away from the axis S, that is to say between the inside and outside the scraper, so as to form an opening that flares outward.
  • the difference C increases between the inner end (425) of the fingers and their outer end (426).
  • the fingers (42) comprise at least a first (424) and a second (424 ') planar surface element arranged in such a way that the first surface element (424) of each finger and the second surface element ( 424 ') of an adjacent finger are facing each other and are inclined angularly relative to each other so as to form an opening which tapers outwardly of the scraper.
  • said facing surfaces (424, 424 ') are preferably angularly spaced apart by an angle ⁇ greater than 10 °, so as to form between the fingers a spacing (422, 423) sufficient to allow the evacuation debris from bath crust produced by scraping.
  • the center to center angular spacing ⁇ between the fingers is typically between 20 ° and 90 °.
  • Each doctoring member (43) is preferably arranged on the fingers (42) so as to release a space (45), called “scraping space”, between the scraper member (43) and the piercing member ( 33).
  • each scraper member (43) has an end (431), called “scraping end”, located at a determined distance D1 of said axis S so as to release said scraping space.
  • the determined distance D1 is advantageously the same for all the scraping ends (431).
  • the scraping space (45) is typically between 1 and 5 mm inclusive.
  • the scraping distance D1 is smaller than the relief (44) (corresponding to a constant gap E in the embodiment illustrated in FIGS. Figures 3 to 6 ).
  • the scraper member (43) thus forms a projection turned on the side of the piercing member (33).
  • each scraper member (43) is located at the free end (420) of each finger (42).
  • the scraping end (431) takes the form of a concave surface.
  • the length L2 of this surface, in the direction of the axis S, is typically between 10 mm and 50 mm, and more typically between 10 mm and 30 mm.
  • the area of the concave surface is typically between 10 and 1000 mm 2 .
  • Said concave surface is typically parallel to the lateral outer surface (331) of the piercing member (33), i.e. it conforms to the shape of the lateral outer surface (331).
  • the scraper end (431) takes the form of a tip or an edge.
  • the fingers (42) are typically attached to a support member (41).
  • the scraping members (43) are preferably arranged at a determined distance D3 of the support member (41) at least equal to 100 mm.
  • the scraper (40) is advantageously removable in order to be able to change it, in particular in case of damage or wear.
  • the support element (41) typically comprises fastening means (410, 411), such as a flange or flange (410) provided with through holes (411).
  • the fixing means (410, 411) make it possible, for example, to attach the scraper to a piercing device, typically to the end (34) of a sheath (or sheath) (32) from which the piercing member emerges (33).
  • the support member or body (41) and the fingers (42) are typically in one piece.
  • the fingers (42) are typically made of steel to provide sufficient rigidity.
  • the figures 4 and 5 illustrate various parameters of a scraper according to a preferred embodiment of the invention, wherein the fingers are straight and have a substantially uniform cross-section over more than 50% of their length L1, and for a piercing member (33) of circular section.
  • R is the radius of the piercing member (33)
  • D1 is said determined distance
  • D2 is the distance between the axis S and the central axis of the fingers (42)
  • E is said relief.
  • the scraper (40) according to the invention may advantageously equip the piercing devices (30) used in the igneous electrolysis aluminum production cells having a piercing member movable in translation along an axis T. In particular, it can advantageously equip the lancers-dosers for aluminum production cells by igneous electrolysis, such as those described above.
  • the scraper (40) according to the invention can also equip the stitching and measuring devices, such as that described in the patent EP 0 716 165 (corresponding to the US patent US 6,065,867 ) on behalf of Aluminum Pechiney.
  • the piercing member further comprises measuring means, such as a thermocouple, or serves as a measuring means (it may serve for example as an electrical contact point to detect the contact with the thermocouple). organ and liquid electrolyte bath during its vertical movements).
  • measuring means such as a thermocouple, or serves as a measuring means (it may serve for example as an electrical contact point to detect the contact with the thermocouple). organ and liquid electrolyte bath during its vertical movements).

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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)

Claims (18)

  1. Abstreifer (40) für ein Bohrorgan (33) einer Bohrvorrichtung (30), welche zur Bildung einer Öffnung (11) in einer Kruste (10) aus Aluminiumoxid und erstarrter Badflüssigkeit in einer Schmelzflusselektrolysezelle durch Hin- und Herbewegen des Bohrorgans (33) entlang einer Translationsachse T verwendbar ist, wobei der Abstreifer dadurch gekennzeichnet ist, dass er mindestens drei Finger (42) aufweist, die um eine im Einsatz mit der Translationsachse T zusammenfallende Bezugsachse S herum so angeordnet sind, dass ein Raum (44), eine so genannte "Hinterschneidung" zwischen den Fingern (42) und dem Bohrorgan (33) entsteht, und dass jeder Finger (42) mindestens ein zum Bohrorgan (33) hin vorstehendes Abstreiforgan (43) aufweist.
  2. Abstreifer (40) nach Anspruch 1, dadurch gekennzeichnet, dass die Zahl der Finger (42) zwischen 6 und einschließlich 10 liegt.
  3. Abstreifer (40) nach irgendeinem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass die Länge L1 der Finger (42) mehr als 100 mm beträgt.
  4. Abstreifer (40) nach irgendeinem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der Querschnitt der Finger (42) auf mindestens 50 % ihrer Länge im Wesentlichen gleichmäßig ist.
  5. Abstreifer (40) nach irgendeinem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Finger (42) gerade ausgebildet sind und parallel zur Bezugsachse S des Abstreifers verlaufen.
  6. Abstreifer (40) nach irgendeinem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass der Abstand Cm zwischen den am nächsten beieinander liegenden Flächenpunkten der benachbarten Finger mehr als 10 mm auf mindestens 50 % ihrer Länge L1 beträgt.
  7. Abstreifer (40) nach irgendeinem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass der Abstand C zwischen den benachbarten Fingern mit der Entfernung von der Achse S zunimmt, so dass eine sich nach außen ausweitende Öffnung entsteht.
  8. Abstreifer (40) nach Anspruch 7, dadurch gekennzeichnet, dass die Finger (42) mindestens ein erstes (424) und ein zweites (424') ebenes Flächenelement aufweisen, die so angeordnet sind, dass das erste Flächenelement (424) jedes Fingers und das zweite Flächenelement (424') eines benachbarten Fingers einander gegenüber liegen und winkelig zueinander geneigt sind, so dass eine vom Abstreifer sich nach außen ausweitende Öffnung entsteht.
  9. Abstreifer (40) nach Anspruch 8, dadurch gekennzeichnet, dass die einander gegenüber liegenden Flächen (424, 424') in Bezug auf die Achse S um einen Winkel α größer als 10° voneinander beabstandet sind.
  10. Abstreifer (40) nach irgendeinem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass die Hinterschneidung zwischen den Fingern (42) und dem Bohrorgan (33) größer als 10 mm ist.
  11. Abstreifer (40) nach irgendeinem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass jedes Abstreiforgan (43) am freien Ende (420) jedes Fingers (42) liegt.
  12. Abstreifer (40) nach irgendeinem der Ansprüche 1 bis 11, dadurch gekennzeichnet, dass die Finger (42) an einem Trägerelement (41) befestigt sind.
  13. Abstreifer (40) nach Anspruch 12, dadurch gekennzeichnet, dass die Abstreiforgane (43) in einem bestimmten Abstand D3 vom Trägerelement (41) angeordnet sind, der mindestens 100 mm beträgt.
  14. Abstreifer (40) nach irgendeinem der Ansprüche 12 oder 13, dadurch gekennzeichnet, dass das Trägerelement (41) Befestigungsmittel (410, 411) aufweist.
  15. Bohrvorrichtung (30), bestimmt für eine Schmelzflusselektrolysezelle zur Herstellung von Aluminium und dadurch gekennzeichnet, dass sie einen Abstreifer (40) nach irgendeinem der Ansprüche 1 bis 14 aufweist.
  16. Krustenbrecher-Dosierer, bestimmt für eine Schmelzflusselektrolysezelle zur Herstellung von Aluminium und dadurch gekennzeichnet, dass er einen Abstreifer (40) nach irgendeinem der Ansprüche 1 bis 14 aufweist.
  17. Krustenbrech- und Messvorrichtung, bestimmt für eine Schmelzflusselektrolysezelle zur Herstellung von Aluminium und dadurch gekennzeichnet, dass sie einen Abstreifer (40) nach irgendeinem der Ansprüche 1 bis 14 aufweist.
  18. Verwendung eines Abstreifers (40) nach irgendeinem der Ansprüche 1 bis 14 in einer Schmelzflusselektrolysezelle zur Herstellung von Aluminium.
EP05778797A 2004-06-25 2005-06-22 Abstreifer für einen bohrkugel zum bohren der badkruste in einer aluminium-reduktionszelle Not-in-force EP1774062B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0406953A FR2872176B1 (fr) 2004-06-25 2004-06-25 Racleur d'un organe de percage d'une croute de bain d'une cellule d'electrolyse destinee a la production d'aluminium
PCT/FR2005/001573 WO2006010818A2 (fr) 2004-06-25 2005-06-22 Racleur d'un organe de percage d'une croûte de bain d'une cellule d'électrolyse destinée à la production d'aluminium

Publications (2)

Publication Number Publication Date
EP1774062A2 EP1774062A2 (de) 2007-04-18
EP1774062B1 true EP1774062B1 (de) 2010-08-25

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EP05778797A Not-in-force EP1774062B1 (de) 2004-06-25 2005-06-22 Abstreifer für einen bohrkugel zum bohren der badkruste in einer aluminium-reduktionszelle

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Country Link
US (1) US20070246347A1 (de)
EP (1) EP1774062B1 (de)
CN (1) CN100567579C (de)
AR (1) AR052761A1 (de)
AT (1) ATE478979T1 (de)
AU (1) AU2005266290B2 (de)
CA (1) CA2570550A1 (de)
DE (1) DE602005023169D1 (de)
FR (1) FR2872176B1 (de)
WO (1) WO2006010818A2 (de)
ZA (1) ZA200700135B (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7828462B2 (en) 2006-04-10 2010-11-09 Jensen Bradford B Imitation candle with simulated lighted wick using external light source
CN101413137B (zh) * 2008-05-20 2010-08-04 许磊 刮削式打壳装置
FR3016898B1 (fr) * 2014-01-27 2017-08-04 Rio Tinto Alcan Int Ltd Dispositif de percage d'une croute de bain cryolithaire apte a etre positionne en peripherie d'une cuve d'electrolyse.
CN107497793B (zh) * 2017-09-30 2024-03-12 中冶赛迪技术研究中心有限公司 一种铝槽打壳锤头超声振动清洗装置及方法
FR3077018B1 (fr) * 2018-01-24 2020-01-24 Rio Tinto Alcan International Limited Dispositif de percage comprenant un fourreau tubulaire fixe a un verin
CN112725838A (zh) * 2021-01-19 2021-04-30 黄文强 一种电解铝槽打壳装置

Family Cites Families (7)

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Publication number Priority date Publication date Assignee Title
DE2943293C2 (de) * 1979-09-10 1983-02-03 Schweizerische Aluminium AG, 3965 Chippis Vorrichtung zum Führen eines Meißels einer Einschlageinrichtung
FR2527647A1 (fr) * 1982-05-27 1983-12-02 Pechiney Aluminium Dispositif amovible d'alimentation ponctuelle en alumine d'une cuve d'electrolyse pour la production d'aluminium
FR2727985B1 (fr) * 1994-12-09 1997-01-24 Pechiney Aluminium Procede et dispositif de mesure de la temperature et du niveau du bain d'electrolyse fondu dans les cuves de production d'aluminium
CN2623704Y (zh) * 2003-06-13 2004-07-07 沈阳铝镁设计研究院 一种打壳锤头
FR2860522B1 (fr) * 2003-10-02 2006-01-13 Pechiney Aluminium Procede et systeme de controle des ajouts de matieres pulverulentes dans le bain d'une cellule d'electrolyse destinee a la production d'aluminium
FR2884524B1 (fr) * 2005-04-19 2007-06-15 Aluminium Pechiney Soc Par Act Dispositif de controle de la course d'une pointerolle d'un systeme d'alimentation d'une cellule d'electrolyse de production d'aluminium
US7497861B2 (en) * 2006-01-30 2009-03-03 Warsaw Orthopedic, Inc. Chisel system for osteochondral implants and a surgical procedure involving same

Also Published As

Publication number Publication date
AU2005266290A1 (en) 2006-02-02
CN100567579C (zh) 2009-12-09
FR2872176B1 (fr) 2006-07-28
AR052761A1 (es) 2007-04-04
EP1774062A2 (de) 2007-04-18
FR2872176A1 (fr) 2005-12-30
DE602005023169D1 (de) 2010-10-07
US20070246347A1 (en) 2007-10-25
ZA200700135B (en) 2008-06-25
CA2570550A1 (fr) 2006-02-02
ATE478979T1 (de) 2010-09-15
WO2006010818A3 (fr) 2006-10-05
CN1977069A (zh) 2007-06-06
AU2005266290B2 (en) 2009-12-24
WO2006010818A2 (fr) 2006-02-02

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