EP0025416B1 - Crust-breaking device for an electrolytic furnace - Google Patents

Crust-breaking device for an electrolytic furnace Download PDF

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Publication number
EP0025416B1
EP0025416B1 EP80810283A EP80810283A EP0025416B1 EP 0025416 B1 EP0025416 B1 EP 0025416B1 EP 80810283 A EP80810283 A EP 80810283A EP 80810283 A EP80810283 A EP 80810283A EP 0025416 B1 EP0025416 B1 EP 0025416B1
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EP
European Patent Office
Prior art keywords
guide
chisel
alignment
box
crust
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Expired
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EP80810283A
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German (de)
French (fr)
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EP0025416A1 (en
Inventor
Edwin Gut
Erwin Arnold
Gottfried Maugweiler
Hans Friedli
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Alcan Holdings Switzerland AG
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Schweizerische Aluminium AG
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Application filed by Schweizerische Aluminium AG filed Critical Schweizerische Aluminium AG
Priority to AT80810283T priority Critical patent/ATE1755T1/en
Publication of EP0025416A1 publication Critical patent/EP0025416A1/en
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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 present invention relates to an impact device for breaking the solidified crust of an electrolysis furnace, in particular for the production of aluminum, which comprises a pressure cylinder, a piston rod and a chisel.
  • the electrolyte becomes poor in aluminum oxide.
  • a lower concentration of 1-2% by weight of aluminum oxide in the electrolyte there is an anode effect, which results in a voltage increase from, for example, 4-4.5 V to 30 V and above.
  • the crust must be hammered in and the aluminum oxide concentration increased by adding new aluminum oxide (alumina).
  • the cell is usually operated periodically in normal operation, even if there is no anode effect.
  • the bath crust has to be hammered in and the alumina concentration increased by adding new aluminum oxide, which corresponds to cell operation.
  • the known embodiments have the disadvantage that both the guide and the chisel have to be produced in a solid construction which causes a certain clumsiness.
  • the bearings counteracting rotation will be eroded by penetrated alumina grains and hindered in their function.
  • the inventors have therefore set themselves the task of creating a chisel guide for an impact device for breaking the solidified crust of an electrolysis furnace, which, despite its simple and relatively light construction, secures the chisel against twisting and has a long service life with little susceptibility to faults.
  • the guide box is made of solid steel sheets, for example with a thickness of 2-3 mm, and therefore meets the requirements regarding mechanical stability.
  • the guide box apart from its underside with the chisel outlet opening, can be gas-tight be designed.
  • the guide box reaches through the oven cover so that only its gas-tight part looks out.
  • the cover plate of the guide box is in turn gas-tight penetrated by the piston rod, which presses the chisel down when the crust is hammered in.
  • the guide box also called the guide housing, is flanged to the underside of the printing cylinder.
  • the furnace cover can also be the cover plate of the guide box.
  • the guide rollers preferably consist of a wear-resistant metal casting, e.g. Cast steel or gray cast iron. They are arranged on a roller guide bearing without ball bearings or the like.
  • the guide rollers which preferably have a diameter of a few cm, do not lie directly on a guide surface of the chisel, they have a little play, but ⁇ 1 mm.
  • the structural design and the arrangement of the guide roller (s), depending on the chisel to be guided, can be designed as you see fit.
  • a chisel has only one vertical guide surface, e.g. in the case of a chisel which is semicircular in cross section, a roller extending over part of or over the entire guide surface or two smaller rollers arranged at the ends of this guide surface can be used. In this way, however, only a twisting of the chisel, but not its lateral deflection, can be prevented.
  • longitudinal axes are always horizontal. These longitudinal axes are preferably in the same horizontal plane, in the lowest region of the guide box.
  • a flow wiper is arranged on the underside of the guide box and extends over the entire width of the guide surface (s).
  • the lower edge of the scraper which bears less play than the guide rollers on the guide surface (s), is preferably not horizontal, but e.g. oblique or V-shaped.
  • the impact device which in principle consists of a pressure cylinder, piston rod, chisel and guide box, is attached directly or indirectly to the cell structure or is part of an operating vehicle or furnace manipulator.
  • the stability achieved by the chisel guide according to the invention with guide box and rollers is, compared to the known piston guides, considerably less complex and yet more effective.
  • a cuboid guide box 10 made of sheet steel is shown.
  • the chisel 12 in the present case in the form of a fishtail, is guided through this guide box.
  • the relatively solid construction of the chisel 12 prevents the other one, which is not in engagement with the guide rollers 14
  • Side of the chisel is deflected.
  • a further pair of guide rollers can be provided on the other side, or the guide rollers extend, preferably arranged in the middle, over a larger area of the chisel width.
  • roller guide bearings 16 are fixed on the upper side of the bottom plate of the guide box, e.g. by welding.
  • the flow wiper 18 is arranged on the lower side of the base plate. This stripping device, which extends over the entire width of the guide surfaces, prevents flux residues that solidify when the chisel is pulled up from getting under the guide rollers. No wiper is provided on the narrow sides of the chisel 12.
  • the flow wiper 18 is V-shaped, the angle a expediently being between 90 and 150 °.
  • the guide box 10 extends through the furnace cover 20, with sealing plates 22 being arranged in order to achieve a more effective encapsulation.

Abstract

The invention relates to a chisel alignment unit for a facility for breaking the crust of solidified electrolyte on an electrolytic cell, in particular on a cell for producing aluminum. A mechanically stable alignment box extends from the under side of the chisel in its non-working position to the piston rod. The chisel features at least one vertical alignment surface which is in contact with at least one alignment roll mounted on the alignment box by means of roller bearings. A wiper for removing electrolyte from the chisel is mounted below the alignment rolls and extends over the full width of the alignment surface or surfaces.

Description

Die vorliegende Erfindung bezieht sich auf eine Einschlagvorrichtung zum Brechen der erstarrten Kruste eines Elektrolyseofens, insbesondere zur Herstellung von Aluminium, welche einen Druckzylinder, eine Kolbenstange und einen Meissel umfasst.The present invention relates to an impact device for breaking the solidified crust of an electrolysis furnace, in particular for the production of aluminum, which comprises a pressure cylinder, a piston rod and a chisel.

Für die Gewinnung von Aluminium durch Elektrolyse von Aluminiumoxid wird dieses in einer Fluoridschmelze gelöst, die zum grössten Teil aus Kryolith besteht. Das kathodisch abgeschiedene Aluminium sammelt sich unter der Fluoridschmelze auf dem Kohleboden der Zelle, wobei die Oberfläche des flüssigen Aluminiums die Kathode bildet. In die Schmelze tauchen von oben Anoden ein, die bei konventionnellen Verfahren aus amorphem Kohlenstoff bestehen. An den Kohleanoden entsteht durch die elektrolytische Zersetzung des Aluminiumoxids Sauerstoff, der sich mit dem Kohlenstoff der Anoden zu C02 und CO verbindet. Die Elektrolyse findet in einem Temperaturbereich von etwa 940-970 °C statt.For the production of aluminum by electrolysis of aluminum oxide, this is dissolved in a fluoride melt, which largely consists of cryolite. The cathodically deposited aluminum collects under the fluoride melt on the carbon bottom of the cell, the surface of the liquid aluminum forming the cathode. Anodes, which consist of amorphous carbon in conventional processes, are immersed in the melt. At the carbon anodes, the electrolytic decomposition of the aluminum oxide produces oxygen, which combines with the carbon of the anodes to form CO 2 and CO. The electrolysis takes place in a temperature range of approximately 940-970 ° C.

Im Laufe der Elektrolyse verarmt der Elektrolyt an Aluminiumoxid. Bei einer unteren Konzentration von 1-2 Gew.-% Aluminiumoxid im Elektrolyten kommt es zum Anodeneffekt, der sich in einer Spannungserhöhung von beispielsweise 4-4,5 V auf 30 V und darüber auswirkt. Spätestens dann muss die Kruste eingeschlagen und die Aluminiumoxidkonzentration durch Zugabe von neuem Aluminiumoxid (Tonerde) angehoben werden.In the course of electrolysis, the electrolyte becomes poor in aluminum oxide. With a lower concentration of 1-2% by weight of aluminum oxide in the electrolyte, there is an anode effect, which results in a voltage increase from, for example, 4-4.5 V to 30 V and above. At the latest then the crust must be hammered in and the aluminum oxide concentration increased by adding new aluminum oxide (alumina).

Die Zelle wird im normalen Betrieb üblicherweise periodisch bedient, auch wenn kein Anodeneffekt auftritt. Ausserdem muss bei jedem Anodeneffekt die Badkruste eingeschlagen und die Tonerdekonzentration durch Zugabe von neuem Aluminiumoxid angehoben werden, was einer Zellenbedienung entspricht.The cell is usually operated periodically in normal operation, even if there is no anode effect. In addition, with each anode effect, the bath crust has to be hammered in and the alumina concentration increased by adding new aluminum oxide, which corresponds to cell operation.

Zur Zellenbedienung ist über lange Jahre die Kruste aus erstarrter Schmelze zwischen den Anoden und dem Seitenbord der Elektrolysezelle eingeschlagen und anschliessend neues Aluminiumoxid zugegeben worden. Diese heute noch weitgehend angewandte Praxis stösst auf zunehmende Kritik wegen Verschmutzung der Luft in der Elektrolysehalle und der äusseren Atmosphäre. Die Forderung nach Kapselung der Elektrolyseöfen und die Behandlung der Abgase ist in den letzten Jahren zunehmend zur zwingenden Notwendigkeit geworden. Eine maximale Zurückhaltung der Elektrolysegase durch Kapselung kann jedoch nicht gewährleistet werden, wenn eine klassische Längsseitenbedienung zwischen den Anoden und dem Seitenbord der Oefen erfolgt.To operate the cell, the crust of solidified melt was hammered in between the anodes and the side board of the electrolysis cell and new aluminum oxide was then added. This practice, which is still widely used today, is met with increasing criticism for pollution of the air in the electrolysis hall and the outside atmosphere. The demand for encapsulation of the electrolysis furnaces and the treatment of the exhaust gases has become an imperative in recent years. However, maximum containment of the electrolysis gases by encapsulation cannot be guaranteed if classic long side operation takes place between the anodes and the side board of the furnaces.

In neuerer Zeit sind deshalb die Aluminiumhersteller immer mehr zur Bedienung in der Ofenlängsachse übergegangen. Nach dem Einschlagen der Kruste erfolgt die Tonerdezugabe entweder lokal und kontinuierlich nach dem « Point-Feeder »-Prinzip oder nicht kontinuierlich über die ganze Ofenlängsachse verteilt. In beiden Fällen ist auf der Elektrolysezelle ein Vorratsbunker für die Tonerde angeordnet. Entsprechendes gilt für die von der Anmelderin in jüngerer Zeit vorgeschlagene Querbedienung der Elektrolyseöfen (DE-Patent Nr. 27 31 908).In recent times, aluminum manufacturers have therefore increasingly switched to operating in the longitudinal axis of the furnace. After the crust has been hammered in, the alumina is added either locally and continuously according to the “point feeder” principle or not continuously distributed over the entire longitudinal axis of the furnace. In both cases, a storage hopper for the alumina is arranged on the electrolysis cell. The same applies to the transverse operation of the electrolysis furnaces recently proposed by the applicant (DE Patent No. 27 31 908).

Für das Einschlagen des erstarrten Flusses werden in bekannten Vorrichtungen im Querschnitt rechteckige oder runde Meissel eingesetzt.In known devices, rectangular or round chisels with a cross-section are used to strike the solidified flow.

Diese Meissel neigen zu Verdrehungen, wenn sie die harte Kruste aus erstarrter Schmelze durchstossen.These chisels tend to twist when they pierce the hard crust of solidified melt.

Zur Verhinderung von Verdrehungen an im Querschnitt rechteckigen Meisseln sind in der Literatur spezifische Vorrichtungen beschrieben worden :

  • - Eine Führung im Druckzylinder, ohne Zentrierrollen, für eine Schlagvorrichtung mit kleinem Hub.
  • - Eine Führung im Druckzylinder und unterhalb davon, was einer sogenannten Doppelführung entspricht.
  • - Eine Führung der Kolbenstange.
Specific devices have been described in the literature for preventing twists on chisels with a rectangular cross section:
  • - A guide in the pressure cylinder, without centering rollers, for a striking device with a small stroke.
  • - A guide in the pressure cylinder and below it, which corresponds to a so-called double guide.
  • - A guide of the piston rod.

Die bekannten Ausführungsformen haben den Nachteil, dass sowohl Führung als auch Meissel in eine gewisse Schwerfälligkeit bewirkender, massiver Bauweise hergestellt werden müssen. Ausserdem besteht die Gefahr, dass die einer Verdrehung entgegenwirkenden Lager durch eingedrungene Tonerdekörner erodiert und in ihrer Funktion behindert werden.The known embodiments have the disadvantage that both the guide and the chisel have to be produced in a solid construction which causes a certain clumsiness. In addition, there is a risk that the bearings counteracting rotation will be eroded by penetrated alumina grains and hindered in their function.

Die Erfinder haben sich deshalb die Aufgabe gestellt, eine Meisselführung für eine Einschlagvorrichtung zum Brechen der erstarrten Kruste eines Elektrolyseofens zu schaffen, welche den Meissel, trotz einfacher und verhältnismässig leichter Bauweise, gegen Verdrehungen sichert und bei geringer Störanfälligkeit eine hohe Lebensdauer aufweist.The inventors have therefore set themselves the task of creating a chisel guide for an impact device for breaking the solidified crust of an electrolysis furnace, which, despite its simple and relatively light construction, secures the chisel against twisting and has a long service life with little susceptibility to faults.

Die erfindungsgemässe Lösung der Aufgabe ist gekennzeichnet durch

  • - einen sich von der Unterseite des Meissels in Ruheposition bis zur Kolbenstange erstreckenden, mechanisch stabilen Führungskasten,
  • - einen Meissel, der wenigstens eine ebene, vertikal verlaufende Führungsfläche aufweist,
  • - mindestens eine, über Rollenlager am Führungskasten befestigte Führungsrolle, die mit der Führungsfläche in Eingriff steht, und
  • - einen am Führungskasten befestigten, sich unterhalb der Führungsrollen über die gesamte Breite der Führungsfläche(n) erstreckenden Flussabstreifer.
The achievement of the object according to the invention is characterized by
  • a mechanically stable guide box that extends from the underside of the chisel in the rest position to the piston rod,
  • a chisel which has at least one flat, vertically running guide surface,
  • - At least one guide roller which is fastened to the guide box via roller bearings and which engages with the guide surface, and
  • - A flow scraper attached to the guide box and extending below the guide rollers over the entire width of the guide surface (s).

Der Führungskasten ist aus soliden Stahlblechen, die beispielsweise eine Dicke von 2-3 mm haben, hergestellt und erfüllt daher die Anforderungen bezüglich der mechanischen Stabilität.The guide box is made of solid steel sheets, for example with a thickness of 2-3 mm, and therefore meets the requirements regarding mechanical stability.

Nach einer bevorzugten Ausführungsform kann der Führungskasten, abgesehen von seiner Unterseite mit der Meisselaustrittsöffnung, gasdicht ausgestaltet werden. Bei gekapselten Oefen durchgreift der Führungskasten nach einer ersten Variante die Ofenabdeckung so, dass nur dessen gasdichter Teil herausschaut. Das Deckblech des Führungskastens wird seinerseits von der Kolbenstange, die den Meissel beim Einschlagen der Kruste nach unten drückt, gasdicht durchgriffen. Nach einer zweiten Variante ist der Führungskasten, auch Führungsgehäuse genannt, an der Unterseite des Druckzylinders angeflanscht. Nach einer weiteren Variante kann die Ofenabdeckung auch das Deckblech des Führungskasten sein.According to a preferred embodiment, the guide box, apart from its underside with the chisel outlet opening, can be gas-tight be designed. In the case of encapsulated ovens, according to a first variant, the guide box reaches through the oven cover so that only its gas-tight part looks out. The cover plate of the guide box is in turn gas-tight penetrated by the piston rod, which presses the chisel down when the crust is hammered in. According to a second variant, the guide box, also called the guide housing, is flanged to the underside of the printing cylinder. According to a further variant, the furnace cover can also be the cover plate of the guide box.

Die Führungsrollen bestehenvorzugsweise aus einem verschleissfesten metallischen Gussteil, z.B. Stahlguss oder Grauguss. Sie sind ohne Kugellager oder dergleichen auf einem Rollenführungslager angeordnet. Die Führungsrollen, die bevorzugt einen Durchmesser von einigen cm haben, liegen nicht direkt auf einer Führungsfläche des Meissels auf, sie haben ein wenig Spiel, jedoch < 1 mm.The guide rollers preferably consist of a wear-resistant metal casting, e.g. Cast steel or gray cast iron. They are arranged on a roller guide bearing without ball bearings or the like. The guide rollers, which preferably have a diameter of a few cm, do not lie directly on a guide surface of the chisel, they have a little play, but <1 mm.

Im Prinzip können die konstruktive Gestaltung und die Anordnung der Führungsrolle(n), je nach zu führendem Meissel, nach Gutdünken konzipiert werden.In principle, the structural design and the arrangement of the guide roller (s), depending on the chisel to be guided, can be designed as you see fit.

Weist ein Meissel nur eine vertikale Führungsfläche auf, wie dies z.B. bei einem im Querschnitt halbkreisförmigen Meissel der Fall ist, so kann eine sich über einen Teil der oder über die ganze Führungsfläche erstreckende Rolle bzw. zwei kleinere, an den Enden dieser Führungsfläche angeordnete Rollen eingesetzt werden. Auf diese Weise kann jedoch nur ein Verdrehen des Meissels, nicht aber sein seitliches Ausweichen verhindert werden.If a chisel has only one vertical guide surface, e.g. in the case of a chisel which is semicircular in cross section, a roller extending over part of or over the entire guide surface or two smaller rollers arranged at the ends of this guide surface can be used. In this way, however, only a twisting of the chisel, but not its lateral deflection, can be prevented.

Es ist deshalb, - insbesondere bei Meisseln mit schmalem Querschnitt - zweckmässig, zwei parallele ebene Führungsflächen in vertikaler Richtung vorzusehen, sodass ein Paar von gegenüberliegenden Rollen- bzw. zwei an den Enden der Führungsflächen liegende Rollenpaare ein Verdrehen und ein seitliches Ausweichen verhindern können. Falls ein Rollenpaar in der Mitte der Führungsflächen angeordnet ist, erstrecken sich diese über den grösseren Teil der Breite der Führungsflächen.It is therefore advisable, especially for chisels with a narrow cross-section, to provide two parallel, flat guide surfaces in the vertical direction, so that a pair of opposite roller pairs or two roller pairs located at the ends of the guide surfaces can prevent twisting and lateral evasion. If a pair of rollers is arranged in the middle of the guide surfaces, these extend over the greater part of the width of the guide surfaces.

Unabhängig von der Anzahl und der Anordnung der Führungsrollen verlaufen deren Längsachsen immer horizontal. Vorzugsweise liegen diese Längsachsen in derselben Horizontalebene, im untersten Bereich des Führungskastens.Regardless of the number and arrangement of the guide rollers, their longitudinal axes are always horizontal. These longitudinal axes are preferably in the same horizontal plane, in the lowest region of the guide box.

Beim Zurückfahren des Meissels von der Arbeits- in die Ruheposition wird am Meissel erstarrter Elektrolyt hochgezogen. Um zu vermeiden, dass diese Kruste zwischen Meissel und Führungsrolle(n) gerät, wird an der Unterseite des Führungskastens ein sich über die gesamte Breite der Führungsfläche(n) erstreckender Flussabstreifer angeordnet. Die untere, mit weniger Spiel als die Führungsrollen an der (den) Führungsfläche(n) anliegenden Kante des Abstreifers ist bevorzugt nicht horizontal ausgebildet, sondern z.B. schräg oder V-förmig.When the chisel is moved back from the working position to the rest position, solidified electrolyte is drawn up on the chisel. In order to prevent this crust from getting between the chisel and the guide roller (s), a flow wiper is arranged on the underside of the guide box and extends over the entire width of the guide surface (s). The lower edge of the scraper, which bears less play than the guide rollers on the guide surface (s), is preferably not horizontal, but e.g. oblique or V-shaped.

Die Verhinderung des Verdrehens oder seitlichen Ausweichens bei im Querschnitt schmalen Meisseln, welche bei grossem Kolbenhub nur eingesetzt werden können, wenn sie erfindungsgemäss stabil positioniert sind, ist von wesentlicher Bedeutung, weil dies bei bestehenden Oefen die Umstellung auf Mittelbedienung oder die punktförmige Tonerdezugabe erlaubt, ohne dass beim Umrüsten der Anodenabstand in der Ofenlängsachse wesentlich verändert werden muss.The prevention of twisting or lateral deflection in the case of chisels with a narrow cross-section, which can only be used with a large piston stroke if they are positioned in a stable manner according to the invention, is of essential importance because this allows the switch to central operation or the punctual addition of alumina in existing furnaces without that when converting the anode distance in the longitudinal axis of the furnace must be changed significantly.

Die Einschlagvorrichtung, welche im Prinzip aus Druckzylinder, Kolbenstange, Meissel und Führungskasten besteht, ist direkt oder indirekt am Zellenaufbau befestigt oder Bestandteil eines Bedienungsfahrzeuges bzw. Ofenmanipulators. Die durch die erfindungsgemässe Meisselführung mit Führungskasten und -rollen erreichte Stabilität ist, verglichen mit den bekannten Kolbenführungen, erheblich weniger aufwendig und dennoch wirkungsvoller.The impact device, which in principle consists of a pressure cylinder, piston rod, chisel and guide box, is attached directly or indirectly to the cell structure or is part of an operating vehicle or furnace manipulator. The stability achieved by the chisel guide according to the invention with guide box and rollers is, compared to the known piston guides, considerably less complex and yet more effective.

Ein speziell- Ausführungsform der Erfindung wird anhand der Zeichnung schematisch dargestellt. Es zeigen :

  • Figur 1 einen vertikal Längsschnitt mit Teilansicht durch den unteren Teil einer Einschlagvorrichtung in Ruheposition, mit einer Meisselführung.
  • Figur 2 einen Horizontalschnitt durch 11-11 von Fig. 1, mit Teilansicht von oben.
A special embodiment of the invention is shown schematically with reference to the drawing. Show it :
  • Figure 1 is a vertical longitudinal section with a partial view through the lower part of an impact device in the rest position, with a chisel guide.
  • Figure 2 is a horizontal section through 11-11 of Fig. 1, with partial view from above.

In Fig. 1 ist ein quaderförmiger Führungskasten 10 aus Stahlblech dargestellt. Durch diesen Führungskasten wird der Meissel 12, im vorliegenden Fall fischschwanzförmig ausgebildet, geführt. Zwei gegenüberliegende, parallel verlaufende Führungsflächen 13, Breitseiten des im Querschnitt rechtwinkligen Meissels, stehen in Eingriff mit einem seitlich angeordneten Paar von Führungsrollen 14. Durch die verhältnismässig massive Bauart des Meissels 12 wird verhindert, dass die andere, nicht mit den Führungsrollen 14 in Eingriff stehende Seite des Meissels abgelenkt wird. Nach anderen, nicht dargestellten Varianten kann auf der anderen Seite ein weiteres Paar von Führungsrollen vorgesehen werden, oder die Führungsrollen erstrecken sich, vorzugsweise in der Mitte angeordnet, über einen grösseren Bereich der Meisselbreite.In Fig. 1, a cuboid guide box 10 made of sheet steel is shown. The chisel 12, in the present case in the form of a fishtail, is guided through this guide box. Two opposite, parallel guide surfaces 13, broad sides of the chisel, which is rectangular in cross section, are in engagement with a laterally arranged pair of guide rollers 14. The relatively solid construction of the chisel 12 prevents the other one, which is not in engagement with the guide rollers 14 Side of the chisel is deflected. According to other variants, not shown, a further pair of guide rollers can be provided on the other side, or the guide rollers extend, preferably arranged in the middle, over a larger area of the chisel width.

Die Rollenführungslager 16 sind auf der oberen Seite des Bodenblechs des Führungskastens befestigt, z.B. durch Schweissen.The roller guide bearings 16 are fixed on the upper side of the bottom plate of the guide box, e.g. by welding.

Auf der unteren Seite des .Bodenblechs ist der Flussabstreifer 18 angeordnet. Diese sich über die ganze Breite der Führungsflächen erstreckende Abstreifvorrichtung verhindert, dass beim Hochziehen des Meissels erstarrte Flussreste unter die Führungsrollen gelangen. Auf den Schmalseiten des Meissels 12 ist kein Abstreifer vorgesehen.The flow wiper 18 is arranged on the lower side of the base plate. This stripping device, which extends over the entire width of the guide surfaces, prevents flux residues that solidify when the chisel is pulled up from getting under the guide rollers. No wiper is provided on the narrow sides of the chisel 12.

Im Längsschnitt ist der Flussabstreifer 18 V-förmig ausgebildet, wobei der Winkel a zweckmässig zwischen 90 und 150° liegt.In longitudinal section, the flow wiper 18 is V-shaped, the angle a expediently being between 90 and 150 °.

Der Führungskasten 10 durchgreift die Ofenabdeckung 20, wobei zur Erreichung einer wirkungsvolleren Kapselung noch Abdichtungsplatten 22 angeordnet sind.The guide box 10 extends through the furnace cover 20, with sealing plates 22 being arranged in order to achieve a more effective encapsulation.

Claims (8)

1. Crust breaking device for breaking open the solidified crust of an electrolytic cell, in particular the proaucnon or aluminium, which comprises a pressure cylinder, a piston rod and a chisel, characterised by
- a mechanically stable guide box (10) extending from the under side of the chisel (12) in its rest position as far as the piston rod,
- a chisel (12) which has at least one vertically-extending guide surface (13),
- at least one guide roll (14) mounted on the guide box (10) via roller bearings (16), which is in engagement with the guide surface, and
- a melt wiper (18) mounted on the alignment box (10), and extending across the whole width of the guide surface below the alignment rolls (14).
2. Chisel guide according to claim 1, characterised in that the chisel (12) has two parallel guide surfaces (13), and - with a play of < 1 mm - at least one pair of opposed guide rolls (14) is in engagement with these guide surfaces (13).
3. Chisel guide according to claim 2, characterised in that a pair of guide rolls (14) is arranged on one side of the guide surfaces (13).
4. Chisel guide according to claim 2, characterised in that a pair of guide rolls (14) is arranged on each of the two sides of the guide surfaces (14).
5. Chisel guide according to claim 2, characterised in that a pair of guide rolls (14) extending over the greater part of the width is arranged in the middle of the guide surfaces (13).
6. Chisel guide according to one of claims 1-5, characterised in that the lower edge of the melt wiper (18) is made inclined.
7. Chisel guide according to one of claims 1-5, characterised in that the lower edge of the melt wiper (18) is made V-shaped, preferably with an angle (a) of 90-150°.
8. Electrolytic cell with a crust breaking device according to claim 1, characterised in that the covering and the top sheet of the guide box (10) penetrated by the piston rod of the pressure cylinder are of gas-tight construction, and also the displaceable cover for the housing is guided through the cell hood (20) in a gas-tight manner by means of a sealing plate (22).
EP80810283A 1979-09-10 1980-09-09 Crust-breaking device for an electrolytic furnace Expired EP0025416B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80810283T ATE1755T1 (en) 1979-09-10 1980-09-09 WRAPPING DEVICE FOR AN ELECTROLYTIC FURNACE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH8149/79 1979-09-10
CH814979 1979-09-10

Publications (2)

Publication Number Publication Date
EP0025416A1 EP0025416A1 (en) 1981-03-18
EP0025416B1 true EP0025416B1 (en) 1982-11-03

Family

ID=4335904

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80810283A Expired EP0025416B1 (en) 1979-09-10 1980-09-09 Crust-breaking device for an electrolytic furnace

Country Status (9)

Country Link
US (1) US4349231A (en)
EP (1) EP0025416B1 (en)
JP (1) JPS5644788A (en)
AT (1) ATE1755T1 (en)
CA (1) CA1144521A (en)
DE (2) DE2943293C2 (en)
IS (1) IS1149B6 (en)
NO (1) NO154172C (en)
ZA (1) ZA805338B (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH644156A5 (en) * 1979-09-10 1984-07-13 Alusuisse DEVICE FOR OPERATING ELECTROLYSIS OVENS.
JPH0642332Y2 (en) * 1993-10-01 1994-11-02 大日本スクリーン製造株式会社 Substrate cleaning equipment
FR2872176B1 (en) * 2004-06-25 2006-07-28 Ecl Soc Par Actions Simplifiee SCRAPER OF A BODY OF A CRUST OF A BATH OF AN ELECTROLYSIS CELL INTENDED FOR THE PRODUCTION OF ALUMINUM
US7915550B2 (en) * 2008-06-17 2011-03-29 Mac Valves, Inc. Pneumatic system electrical contact device
US8367953B2 (en) * 2008-06-17 2013-02-05 Mac Valves, Inc. Pneumatic system electrical contact device
WO2010151205A1 (en) * 2009-06-25 2010-12-29 Atlas Copco Construction Tools Ab Hand-held demolition tool
CN101634040B (en) * 2009-08-19 2011-04-06 云南云铝润鑫铝业有限公司 Alarm device of crust breaking failure of aluminum electrolysis baths
FR3032458B1 (en) * 2015-02-09 2020-10-30 Ecl SERVICE MODULE FOR THE OPERATION OF AN ALUMINUM PRODUCTION PLANT BY IGNEE ELECTROLYSIS
CN107287621B (en) * 2017-07-07 2023-08-18 新乡宏达冶金振动设备有限公司 Electrolyte cleaning machine

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2666621A (en) * 1951-03-22 1954-01-19 Gerald R Hunt Wiper for members operating in wells
DE1210994B (en) * 1963-07-08 1966-02-17 Adolf Nann Impact device of a crust breaker for aluminum fusible electrolysis furnaces
US3681229A (en) * 1970-07-17 1972-08-01 Aluminum Co Of America Alumina feeder
LU68908A1 (en) * 1973-01-22 1974-02-11
US3901787A (en) * 1974-03-07 1975-08-26 Nippon Light Metal Co Alumina feeder for electrolytic cells
DE2530831C2 (en) * 1975-07-10 1982-06-16 Gewerkschaft Eisenhütte Westfalia, 4670 Lünen Device for blowing gas, in particular air, into an electrolytic molten aluminum bath and for breaking the crust of the molten bath

Also Published As

Publication number Publication date
EP0025416A1 (en) 1981-03-18
IS2581A7 (en) 1981-03-11
IS1149B6 (en) 1984-03-05
ZA805338B (en) 1981-09-30
DE2943293A1 (en) 1981-03-19
CA1144521A (en) 1983-04-12
DE2943293C2 (en) 1983-02-03
NO154172C (en) 1986-08-06
JPS5644788A (en) 1981-04-24
ATE1755T1 (en) 1982-11-15
DE3061041D1 (en) 1982-12-09
NO154172B (en) 1986-04-21
US4349231A (en) 1982-09-14
NO802643L (en) 1981-03-11

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