EP0175395B1 - Current-supplying suspension device for cathodes - Google Patents

Current-supplying suspension device for cathodes Download PDF

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Publication number
EP0175395B1
EP0175395B1 EP85200855A EP85200855A EP0175395B1 EP 0175395 B1 EP0175395 B1 EP 0175395B1 EP 85200855 A EP85200855 A EP 85200855A EP 85200855 A EP85200855 A EP 85200855A EP 0175395 B1 EP0175395 B1 EP 0175395B1
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EP
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Prior art keywords
sheath
copper
current
cathode
section
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EP85200855A
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German (de)
French (fr)
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EP0175395A1 (en
Inventor
Adalbert Bartsch
Gerhard Berndt
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Aurubis AG
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Norddeutsche Affinerie AG
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Priority to AT85200855T priority Critical patent/ATE30605T1/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
    • C25C7/00—Constructional parts, or assemblies thereof, of cells; Servicing or operating of cells
    • C25C7/02—Electrodes; Connections thereof

Definitions

  • the invention relates to a current-carrying suspension device for cathodes, in particular cathodes for copper refining.
  • the copper carriers have been completely protected, for example in Winning electrolyses, up to the contact point (busbar support point) by a lead sheath, which consequently has to be soldered homogeneously and is therefore a generally uneconomical process for refining electrolyses.
  • a suspension rail from z. B. copper for permanent cathodes is known, which is coated with a valve metal by coextrusion. Titanium in particular serves as the metal jacket. The titanium sheath is removed from the ends of the mounting rail in the area of the contact points with the busbar. A permanent cathode sheet made of titanium is connected to the support rail along one edge by spot welding.
  • the use of titanium permanent cathodes of the previously known arrangement also has disadvantages.
  • the manufacturing process for the titanium-coated solid copper profiles by means of coextrusion is extremely complex, so that the use of such profiles remains limited to special applications in which the number of pieces is generally not too large. Furthermore, the process-effective plate surface undergoes significant passivation through oxidation processes.
  • a combination of a titanium-coated support rail made of copper with a cathode sheet made of corrosion-resistant stainless steel, which is desirable per se, is not possible because the materials cannot be welded. It has therefore been used in a known manner according to DE-OS-30 03 927 for the electrolytic refining of copper, a hanging rail made of stainless steel with a welded permanent cathode made of the same steel.
  • the hanging rail is equipped with a copper coating, and a copper coating is also provided in the area of the welding point of the cathode sheet. Electroplated copper coatings have proven to be insufficient. The thickness of the copper coating required goes far beyond the area of general galvanic copper plating ( ⁇ m range).
  • the covering thickness is 1.3 to 2.5 mm in order to avoid any noticeable loss of performance due to a drop in voltage and to take account of the corrosion removal.
  • Special complex systems must therefore be provided for the copper plating, which include the sandblasting, cleaning, etching, nickel plating and copper plating operations.
  • the invention has for its object to avoid the above-mentioned disadvantages of the known cathodes for electrolytic copper refining and to provide a suspension device with permanent cathode that can be manufactured easily and inexpensively and that has a high fatigue strength with good current transfer.
  • a current-carrying suspension device of the aforementioned type for cathodes with a metal-clad support rail made of copper and a permanent cathode sheet which is at least partially welded to a longitudinal edge and made of a material corresponding to the cladding, and at least one rail end along at least part of which is free from the cladding is designed in accordance with the invention in such a way that the carrier rail is a hollow copper profile and the sheathing is made of stainless steel, the sheathing being welded to the carrier rail in a pore and diffusion-tight manner and the permanent cathode made of stainless steel being connected to the sheathing by an interrupted weld seam.
  • the excellent electrical conductivity of the copper is fully used and thus the lowest voltage drop in the supporting structure is guaranteed. Furthermore, a high degree of dimensional stability is ensured even with robust mechanical handling.
  • the copper hollow profile of the device according to the invention is expediently a copper tube. Generally it has a wall thickness of 4 to 6 mm with an outer diameter generally of 30 to 45 mm, depending on required final weight and dimensions of the production cathode.
  • a stainless steel jacket tube is positively attached to the copper tube. In the simplest case, this is done by pushing on a stainless steel tube with an inner diameter that is only slightly larger than the outer diameter of the copper tube.
  • a stainless steel tube is expediently used, which is slotted over its entire length. In this case, the inside diameter of the stainless steel tube can be equal to or smaller than the outside diameter of the copper tube.
  • both an excellent form fit is achieved and an additional possibility is created to bring about an improved and uniform current transfer from the current-carrying copper bar to the sheathing by welding the longitudinal slot, for example by inserting a welding bead.
  • the longitudinal slot is generally on the side facing away from the electrolyte.
  • the composite body can be manufactured according to the production method of longitudinally welded pipes.
  • the hollow copper profile such as copper pipe
  • the stainless steel sheet metal strip usually used there for pipe production is introduced within the rolling / welding section into the stainless steel sheet metal strip usually used there for pipe production.
  • the welding is carried out in the area of the remaining profile gap between the copper pipe and the stainless steel jacket.
  • the casing can also consist of a stainless steel sheet which is positively applied by known methods of non-cutting shaping.
  • the sheathing is recessed or notched at least at one end of the support rail, so that the copper material of the hollow profile is exposed and can be contacted with the copper busbar of the electrolysis cell.
  • the cut areas of the stainless steel jacket as well as all ends of the composite body are welded to the hollow copper profile in a pore and gas diffusion-tight manner. The tight seal between the hollow copper body and the stainless steel jacket prevents the diffusion of liquid and gas and ensures a perfectly defined current transfer across the weld cross-sections.
  • a composite body made of stainless steel-coated copper pipe is sufficient as a support rail with good mechanical stability and good electrical conductivity.
  • the composite hollow body of the invention is compression-molded.
  • the copper tube provided with a stainless steel jacket is deformed into a composite body with an elliptical or two parallel wall cross-section, the long axis of which lies in the plane of the cathode sheet.
  • all cross-sectional shapes in between are also suitable.
  • the elliptical / oval cross-section of the suspension device according to the invention provides the advantageous point contact at the power supply ends without a special manufacturing process and, due to the indifferent support on the power supply rail, leads to the vertical position of the cathode sheet which is important for the success of electrolysis.
  • this shape of the suspension device according to the invention also saves space within the area of the support rail.
  • the deformed composite body has additional contact pressing points, which are caused by z. B. grain strikes are caused and contribute to a current transfer with lower losses.
  • the lower profile line has rows of grains. In this case, the grain rows are limited in length to the length of the weld seams and are covered by them.
  • a permanent cathode made of stainless steel, corresponding to the material of the casing, is welded to the casing.
  • the welded joint is designed as an interrupted weld seam to avoid excessive longitudinal tension and warping of the cathode sheet.
  • the upper edge of the cathode sheet is expediently welded to the underside of the casing via a plurality of webs.
  • Stainless steels based on chromium, nickel or chromium / nickel / molybdenum are suitable as material for the cathode sheet and sheathing, for example austenitic Cr / Ni steels with the composition 17 to 18% Cr, 10 to 12% Ni, 2 to 2.5% Mo, depending on the C content stabilized z. B. with Ti, Nb, Ta.
  • the advantages of the suspension device according to the invention lie in the simple and economical production, in the high corrosion resistance of the entire device, which has practically only stainless steel surfaces, in the good current transfer between the copper profile and the stainless steel jacket via welded joints and additional contact points caused by pressing and rows of grains. Furthermore, the suspension device ensures a secure setting of the cathode plate in the vertical position in the electrolysis container.
  • the cathode sheet 1 is welded to the stainless steel jacket 2, which encloses the hollow copper profile 3.
  • the copper profile is exposed as a contact point due to the recess or notch in the jacket.
  • Fig. 2 a section along the line A-B of Fig. 1 is shown in plan view from below. In the area of the connection of the cathode sheet 1 with the jacket 2, a contact-improving row of grains is indicated by reference number 4.
  • Fig. 3 shows a composite body made of a copper tube 3 with a casing 2 made of a stainless steel tube before the non-cutting shaping.
  • FIG. 4 the oval support rail made of composite pipe with the cathode plate is shown in section after the non-cutting shaping.
  • the cathode sheet 1 is connected to the casing 2 via the weld seam 7.
  • the welds 6 seal the transition copper profile / stainless steel jacket at the recess in the jacket diffusion-tight.
  • Reference number 5 indicates a weld seam which seals a longitudinal slot in the upper surface line of the stainless steel profile and causes a current transfer from the current-carrying core profile to the surface profile.
  • Fig. 5 is a section along the line C-D of Fig. 2. With 4 a strong grain is designated, which acts on the casing 2 and the inner hollow profile 3 and creates an additional contact point.
  • the composite body made of hollow copper profile 3 and stainless steel jacket 2, connected to it by welds 6, lies with the jacket-free part on the conductor rail 8 of the wall 9 of the electrolysis container.
  • FIG. 7 corresponds to that of FIG. 6, but with the exception that the lower jacket end has a recess that rises outwards and towards the profile axis.

Abstract

A current-feeding cathode-mounting device comprises a metal-sheathed carrying rail of copper and a permanent cathode plate consisting of the same material as the sheath and joined by welding at least along part of a longitudinal edge and wherein at least an end portion of the rail is unsheathed at least along part of its extent. In order to increase the creep strength and durability and to ensure a low-resistance contact, the carrying rail consists of a hollow copper section, the sheath consists of special steel, the sheath is joined to the carrying rail by a diffusion-preventing non-porous weld, and the permanent cathode of special steel is joined to the sheath by an interrupted seal weld. The carrying rail consists suitably of a copper tube. In accordance with a further feature the copper tube provided with a special steel sheath has been deformed to constitute a composite having an elliptical or oval cross-section or a cross-section having two parallel sides, and the major axis of said cross-section lies in the plane of the cathode plate.

Description

Die Erfindung betrifft eine stromzuführende Aufhängevorrichtung für Kathoden, insbesondere Kathoden für die Kupferraffination.The invention relates to a current-carrying suspension device for cathodes, in particular cathodes for copper refining.

Bei der Kupferraffination durch elektrolytische Verfahren sind für die Elektrolyse-Kathoden unterschiedliche Konstruktionen bekannt, die sich in der Auswahl der Werkstoffe bzw. Werkstoffkombinationen im Hinblick auf gute elektrische Leitfähigkeit zur Minimierung der Energieverluste, mechanische Stabilität zur Minimierung von Reparaturaufwand und Minimierung von Produktions- sowie Qualitätseinbußen und ferner im Hinblick auf Korrosionsbeständigkeit voneinander unterscheiden. Aufgrund seiner guten elektrischen Leitfähigkeit hat man im allgemeinen Kupfer als Werkstoff für die Trageschienen verwendet, an denen die z. B. Dauerkathodenbleche befestigt sind. Die Enden der Trageschienen ruhen auf Stromschienen, die beiderseits einer elektrolytischen Zelle verlaufen. Kupfer weist indessen die Nachteile relativ geringer Festigkeit (Verformungsschäden im Betrieb) und nur mäßige Korrosionsbeständigkeit gegenüber z. B. dem Kupferelektrolyten auf. Zwecks Verbesserung der Korrosionsbeständigkeit hat man daher beispielsweise in Winning-Elektrolysen die Kupferträger bis an die Kontaktstelle (Stromschienen-Auflagepunkt) vollständig durch einen Bleimantel geschützt, der konsequenterweise homogen aufgelötet werden muß und somit ein für Raffinationselektrolysen allgemein unwirtschaftliches Verfahren darstellt.In copper refining by means of electrolytic processes, different designs are known for the electrolysis cathodes, which differ in the choice of materials or material combinations with regard to good electrical conductivity to minimize energy losses, mechanical stability to minimize repair work and minimize production and quality losses and further differ from each other in terms of corrosion resistance. Because of its good electrical conductivity, copper has generally been used as a material for the mounting rails, on which the z. B. permanent cathode sheets are attached. The ends of the support rails rest on busbars that run on both sides of an electrolytic cell. Copper, however, has the disadvantages of relatively low strength (deformation damage in operation) and only moderate corrosion resistance to e.g. B. the copper electrolyte. In order to improve the corrosion resistance, the copper carriers have been completely protected, for example in Winning electrolyses, up to the contact point (busbar support point) by a lead sheath, which consequently has to be soldered homogeneously and is therefore a generally uneconomical process for refining electrolyses.

Aus DE-OS-24 34 214 ist eine Aufhänge-Schiene aus z. B. Kupfer für Dauerkathoden bekannt, die mit einem Ventilmetall durch Coextrusion ummantelt ist. Als Metallmantel dient insbesondere Titan. An den Enden der Trageschiene ist im Bereich der Kontaktpunkte mit der Stromschiene der Titanmantel entfernt. Ein Dauerkathodenblech aus Titan ist längs einer Kante durch Punktschweißung mit der Trägerschiene verbunden. Der Einsatz von Titan-Dauerkathoden der vorbekannten Anordnung bringt auch Nachteile mit sich. Der Herstellungsprozeß für die titanummantelten massiven Kupferprofile mittels Coextrusion ist in hohem Maße aufwendig, so daß der Einsatz solcher Profile auf spezielle Anwendungsfälle bei im allgemeinen nicht zu großer Stückzahl beschränkt bleibt. Des weiteren erfährt die prozeßwirksame Plattenoberfläche durch Oxidationsvorgänge eine nennenswerte Passivierung.From DE-OS-24 34 214 a suspension rail from z. B. copper for permanent cathodes is known, which is coated with a valve metal by coextrusion. Titanium in particular serves as the metal jacket. The titanium sheath is removed from the ends of the mounting rail in the area of the contact points with the busbar. A permanent cathode sheet made of titanium is connected to the support rail along one edge by spot welding. The use of titanium permanent cathodes of the previously known arrangement also has disadvantages. The manufacturing process for the titanium-coated solid copper profiles by means of coextrusion is extremely complex, so that the use of such profiles remains limited to special applications in which the number of pieces is generally not too large. Furthermore, the process-effective plate surface undergoes significant passivation through oxidation processes.

Andererseits ist eine an sich wünschenswerte Kombination einer titanummantelten Trägerschiene aus Kupfer mit einem Kathodenblech aus korrosionsbeständigem Edelstahl wegen Nichtverschweißbarkeit der Werkstoffe nicht möglich. Man hat daher in bekannter Weise gemäß DE-OS-30 03 927 für die elektrolytische Raffination von Kupfer eine Hängeschiene aus nichtrostendem Stahl mit einer angeschweißten Dauerkathode aus ebensolchem Stahl eingesetzt. Bei der vorbekannten Vorrichtung ist die Hängeschiene mit einer Kupferauflage ausgerüstet, und es ist auch im Bereich der Schweißstelle des Kathodenbleches eine Kupferauflage vorgesehen. Galvanisch aufgebrachte Kupferauflagen haben sich als nicht ausreichend erwiesen. Die Dicke des erforderlichen Kupferbelages geht über den Bereich des allgemeinen galvanischen Verkupferns (µm-Bereich) weit hinaus. Die Belagstärke beträgt 1,3 bis 2,5 mm, um nennenswerte Leistungsverluste infolge Spannungsabfall zu vermeiden und dem Korrosionsabtrag Rechnung zu tragen. Für die Verkupferung müssen daher spezielle aufwendige Anlagen vorgesehen werden, die die Fertigungsgänge Sandstrahlen, Reinigen, Ätzen, Vernickeln, Verkupfern beinhalten.On the other hand, a combination of a titanium-coated support rail made of copper with a cathode sheet made of corrosion-resistant stainless steel, which is desirable per se, is not possible because the materials cannot be welded. It has therefore been used in a known manner according to DE-OS-30 03 927 for the electrolytic refining of copper, a hanging rail made of stainless steel with a welded permanent cathode made of the same steel. In the previously known device, the hanging rail is equipped with a copper coating, and a copper coating is also provided in the area of the welding point of the cathode sheet. Electroplated copper coatings have proven to be insufficient. The thickness of the copper coating required goes far beyond the area of general galvanic copper plating (µm range). The covering thickness is 1.3 to 2.5 mm in order to avoid any noticeable loss of performance due to a drop in voltage and to take account of the corrosion removal. Special complex systems must therefore be provided for the copper plating, which include the sandblasting, cleaning, etching, nickel plating and copper plating operations.

Einer breiten Anwendung der vorbekannten Vorrichtung stehen ferner auch die technischen Schwierigkeiten wie auch der hohe Investitionsaufwand entgegen, der für die Herstellung der ummantelten massiven Profile der Trägerschiene durch Coextrusion erforderlich ist.A wide application of the previously known device is also opposed by the technical difficulties and also the high capital expenditure which is required for the production of the encased solid profiles of the carrier rail by coextrusion.

Der Erfindung liegt die Aufgabe zugrunde, die insbesondere vorgenannten Nachteile der vorbekannten Kathoden für die elektrolytische Kupferraffination zu vermeiden und eine Aufhängevorrichtung mit Dauerkathode bereitzustellen, die einfach und kostengünstig hergestellt werden kann und die eine hohe Dauerstandfestigkeit bei gutem Stromübergang besitzt.The invention has for its object to avoid the above-mentioned disadvantages of the known cathodes for electrolytic copper refining and to provide a suspension device with permanent cathode that can be manufactured easily and inexpensively and that has a high fatigue strength with good current transfer.

Die Aufgabe wird gelöst, indem eine stromzuführende Aufhängevorrichtung der vorgenannten Art für Kathoden mit einer metallummantelten Trägerschiene aus Kupfer und einen mit einer Längskante mindestens teilweise verschweißten Dauerkathodenblech aus einem der Ummantelung entsprechenden Werkstoff und wobei wenigstens ein Schienenende längs wenigstens eines Teils frei von der Ummantelung ist, gemäß der Erfindung derart ausgestaltet wird, daß die Trägerschiene ein Kupfer-Hohlprofil ist und die Ummantelung aus Edelstahl besteht, wobei die Ummantelung mit der Trägerschiene poren- und diffusionsdicht verschweißt ist und die Dauerkathode aus Edelstahl über eine unterbrochene Schweißnaht mit der Ummantelung verbunden ist.The object is achieved in that a current-carrying suspension device of the aforementioned type for cathodes with a metal-clad support rail made of copper and a permanent cathode sheet which is at least partially welded to a longitudinal edge and made of a material corresponding to the cladding, and at least one rail end along at least part of which is free from the cladding, is designed in accordance with the invention in such a way that the carrier rail is a hollow copper profile and the sheathing is made of stainless steel, the sheathing being welded to the carrier rail in a pore and diffusion-tight manner and the permanent cathode made of stainless steel being connected to the sheathing by an interrupted weld seam.

Mit der Vorrichtung gemäß der Erfindung wird die hervorragende elektrische Leitfähigkeit des Kupfers völlig genutzt und damit geringster Spannungsabfall in der Tragkonstruktion gewährleistet. Des weiteren wird eine hohe Formstabilität auch bei robuster maschineller Handhabung sichergestellt.With the device according to the invention, the excellent electrical conductivity of the copper is fully used and thus the lowest voltage drop in the supporting structure is guaranteed. Furthermore, a high degree of dimensional stability is ensured even with robust mechanical handling.

Zweckmäßig ist das Kupferhohlprofil der erfindungsgemäßen Vorrichtung ein Kupferrohr. Im allgemeinen hat es eine Wandstärke von 4 bis 6 mm bei einem äußeren Durchmesser im allgemeinen von 30 bis 45 mm, je nach gefordertem Endgewicht und Abmessung der Produktionskathode. Auf das Kupferrohr ist förmschlüssig ein Mantelrohr aus Edelstahl aufgebracht. Im einfachsten Fall geschieht dies durch Aufschieben eines Edelstahlrohres mit einem Innendurchmesser, der nur geringfügig größer als der Außendurchmesser des Kupferrohres ist. Zweckmäßig wird jedoch ein Edelstahlrohr eingesetzt, das über seine gesamte Länge geschlitzt ist. In diesem Fall kann der Innendurchmesser des Edelstahlrohres gleich oder kleiner als der Außendurchmesser des Kupferrohres sein. Hierdurch wird sowohl eine hervorragende Formschlüssigkeit erzielt als auch eine zusätzliche Möglichkeit geschaffen, durch Verschweißen des Längsschlitzes, beispielsweise durch Einlegen einer Schweißraupe, einen verbesserten und gleichmäßigen Stromübergang von der stromführenden Kupferschiene auf die Ummantelung herbeizuführen. Der Längsschlitz liegt im allgemeinen auf der dem Elektrolyten abgewandten Seite. Es kann aber auch zweckmäßig sein, den Längsschlitz der Ummantelung dem Elektrolyten zuzukehren. In diesem Fall ist das Kathodenblech mindestens mit Teilen seiner Oberkante in den Schlitz eingeschoben und sowohl mit dem Kupferrohr als auch mit dem Edelstahlmantel im Schlitzbereich verschweißt.The copper hollow profile of the device according to the invention is expediently a copper tube. Generally it has a wall thickness of 4 to 6 mm with an outer diameter generally of 30 to 45 mm, depending on required final weight and dimensions of the production cathode. A stainless steel jacket tube is positively attached to the copper tube. In the simplest case, this is done by pushing on a stainless steel tube with an inner diameter that is only slightly larger than the outer diameter of the copper tube. However, a stainless steel tube is expediently used, which is slotted over its entire length. In this case, the inside diameter of the stainless steel tube can be equal to or smaller than the outside diameter of the copper tube. As a result, both an excellent form fit is achieved and an additional possibility is created to bring about an improved and uniform current transfer from the current-carrying copper bar to the sheathing by welding the longitudinal slot, for example by inserting a welding bead. The longitudinal slot is generally on the side facing away from the electrolyte. However, it can also be expedient to turn the longitudinal slot of the casing toward the electrolyte. In this case, at least part of the upper edge of the cathode sheet is inserted into the slot and welded to both the copper tube and the stainless steel jacket in the slot area.

In besonders zweckmäßiger und wirtschaftlicher Weise kann der Verbundkörper entsprechend der Herstellungsweise längsnahtgeschweißter Rohre gefertigt werden. Hierbei wird das Kupferhohlprofil, wie Kupferrohr, innerhalb der Walz/Schweißwerk-Strecke in das dort für die Rohrherstellung üblicherweise verwendete Edelstahl-Blechband eingebracht. Im Bereich des verbleibenden Profilspaltes zwischen Kupferrohr und Edelstahlmantel wird die Verschweißung vorgenommen.In a particularly expedient and economical manner, the composite body can be manufactured according to the production method of longitudinally welded pipes. Here, the hollow copper profile, such as copper pipe, is introduced within the rolling / welding section into the stainless steel sheet metal strip usually used there for pipe production. The welding is carried out in the area of the remaining profile gap between the copper pipe and the stainless steel jacket.

Selbstverständlich kann die Ummantelung auch aus einem Edelstahlblech bestehen, das durch an sich bekannte Verfahren der spanlosen Formgebung formschlüssig aufgebracht ist.Of course, the casing can also consist of a stainless steel sheet which is positively applied by known methods of non-cutting shaping.

In allen Fällen ist die Ummantelung mindestens an einem Ende der Trägerschiene ausgenommen bzw. ausgeklinkt, so daß der Kupferwerkstoff des Hohlprofils freiliegt und mit der kupfernen Stromschiene der Elektrolysezelle kontaktiert werden kann. Die angeschnittenen Bereiche des Edelstahlmantels wie auch alle Enden des Verbundkörpers sind mit dem Kupferhohlprofil poren- und gasdiffusionsdicht verschweißt. Der dichte Abschluß zwischen Kupferhohlkörper und Edelstahlmantel verhindert das Eindiffundieren von Flüssigkeit und Gas und bewirkt einen einwandfreien definierten Stromübergang über die Schweißnahtquerschnitte.In all cases, the sheathing is recessed or notched at least at one end of the support rail, so that the copper material of the hollow profile is exposed and can be contacted with the copper busbar of the electrolysis cell. The cut areas of the stainless steel jacket as well as all ends of the composite body are welded to the hollow copper profile in a pore and gas diffusion-tight manner. The tight seal between the hollow copper body and the stainless steel jacket prevents the diffusion of liquid and gas and ensures a perfectly defined current transfer across the weld cross-sections.

In vielen Fällen ist ein Verbundkörper aus edelstahlummanteltem Kupferrohr als Trageschiene bei guter mechanischer Stabilität und guter elektrischer Leitfähigkeit ausreichend. Zur Erhöhung der mechanischen Stabilität in Beanspruchungsrichtung wie auch zur Verbesserung der elektrischen Leitfähigkeit ist jedoch der Verbund-Hohlkörper der Erfindung preßverformt. Hierbei ist das mit einem Edelstahlmantel versehene Kupferrohr zu einem Verbundkörper mit elliptischem oder zwei parallele Wandungen aufweisendem Querschnitt verformt, dessen lange Achse in der Ebene des Kathodenblechs liegt. Selbstverständlich sind auch alle dazwischenliegenden Querschnittsformen geeignet. Der elliptisch/ovale Querschnitt der erfindungsgemäßen Aufhängevorrichtung ergibt an den Stromzuführungsenden ohne besonderen Fertigungsgang den vorteilhaften Punktkontakt und führt, infolge indifferenter Auflage auf der Stromzuführungsschiene, zu der für den Elektrolyse-Erfolg wichtigen Senkrechtposition des Kathodenbleches. Darüber hinaus wird auch mit dieser Form der erfindungsgemäßen Aufhängevorrichtung eine Platzersparnis innerhalb des Bereichs der Trageschiene erzielt.In many cases, a composite body made of stainless steel-coated copper pipe is sufficient as a support rail with good mechanical stability and good electrical conductivity. To increase the mechanical stability in the direction of stress as well as to improve the electrical conductivity, however, the composite hollow body of the invention is compression-molded. Here, the copper tube provided with a stainless steel jacket is deformed into a composite body with an elliptical or two parallel wall cross-section, the long axis of which lies in the plane of the cathode sheet. Of course, all cross-sectional shapes in between are also suitable. The elliptical / oval cross-section of the suspension device according to the invention provides the advantageous point contact at the power supply ends without a special manufacturing process and, due to the indifferent support on the power supply rail, leads to the vertical position of the cathode sheet which is important for the success of electrolysis. In addition, this shape of the suspension device according to the invention also saves space within the area of the support rail.

Vorteilhaft weist der verformte Verbundkörper zusätzliche Kontakt-Preßpunkte auf, die durch z. B. Körnerschläge bewirkt sind und zu einem Stromübergang mit geringeren Verlusten beitragen. Insbesondere weist die untere Profillinie Körnerreihen auf. Die Körnerreihen sind in diesem Fall in ihrer Länge auf die Länge der Schweißnähte begrenzt und werden durch sie abgedeckt.Advantageously, the deformed composite body has additional contact pressing points, which are caused by z. B. grain strikes are caused and contribute to a current transfer with lower losses. In particular, the lower profile line has rows of grains. In this case, the grain rows are limited in length to the length of the weld seams and are covered by them.

An der Unterseite der erfindungsgemäßen Aufhängevorrichtung ist eine Dauerkathode aus Edelstahl, entsprechend dem Werkstoff der Ummantelung, an den Mantel angeschweißt. Die Schweißverbindung ist zur Vermeidung übermäßiger Längsspannung und Verwölbung des Kathodenblechs als unterbrochene Schweißnaht ausgeführt. Zweckmäßig ist jedoch die obere Kante des Kathodenbleches über mehrere Stege mit der Unterseite der Ummantelung verschweißt.On the underside of the suspension device according to the invention, a permanent cathode made of stainless steel, corresponding to the material of the casing, is welded to the casing. The welded joint is designed as an interrupted weld seam to avoid excessive longitudinal tension and warping of the cathode sheet. However, the upper edge of the cathode sheet is expediently welded to the underside of the casing via a plurality of webs.

Als Werkstoff für Kathodenblech und Ummantelung eignen sich Edelstähle auf Basis Chrom, Nickel oder Chrom/Nickel/Molybdän, beispielsweise austenitische Cr/Ni-Stähle der Zusammensetzung 17 bis 18 % Cr, 10 bis 12 % Ni, 2 bis 2,5 % Mo, je nach C-Gehalt stabilisiert z. B. mit Ti, Nb, Ta.Stainless steels based on chromium, nickel or chromium / nickel / molybdenum are suitable as material for the cathode sheet and sheathing, for example austenitic Cr / Ni steels with the composition 17 to 18% Cr, 10 to 12% Ni, 2 to 2.5% Mo, depending on the C content stabilized z. B. with Ti, Nb, Ta.

Die Vorteile der erfindungsgemäßen Aufhängevorrichtung liegen in der einfachen und wirtschaftlichen Fertigung, in der hohen Korrosionsbeständigkeit der gesamten, praktisch nur Edelstahloberflächen aufweisenden Vorrichtung, in dem guten Stromübergang zwischen Kupferprofil und Edelstahlmantel über Schweißverbindungen und zusätzliche, durch Pressung und Körnerreihen bewirkte Kontaktpunkte. Ferner gewährleistet die Aufhängevorrichtung eine sichere Einstellung des Kathodenbleches in lotrechter Position in dem Elektrolysebehälter.The advantages of the suspension device according to the invention lie in the simple and economical production, in the high corrosion resistance of the entire device, which has practically only stainless steel surfaces, in the good current transfer between the copper profile and the stainless steel jacket via welded joints and additional contact points caused by pressing and rows of grains. Furthermore, the suspension device ensures a secure setting of the cathode plate in the vertical position in the electrolysis container.

Die Erfindung wird anhand der Abbildungen näher und beispielhaft veranschaulicht.The invention is illustrated in more detail and by way of example using the figures.

Es zeigen:

  • Figur 1 eine Seitenansicht der AufhängeVorrichtung im Ausschnitt,
  • Figur 2 eine Draufsicht auf die Unterkante der Trageschiene gemäß Schnitt A-B der Figur 1 (in vergrößertem Maßstab),
  • Figur 3 einen Ouerschnitt durch den Rohrverbundkörper vor der Pressung,
  • Figur 4 einen Querschnitt durch den verformten und verschweißten Verbundkörper mit Kathodenblech,
  • Figur 5 einen Querschnitt des spanlos verformten Verbundkörpers entlang der Linie C-D der Fig. 2 (in vergrößertem Maßstab),
  • Figur 6 eine Seitenansicht des Schienenendes der Aufhängevorrichtung mit Kathode, wobei das Ende der Trageschiene auf dem Stromkontakt des Elektrolysebehälters aufliegt,
  • Figur 7 eine Seitenansicht entsprechend der Fig. 6 mit einer anderen Ausführungsform der Ausnehmung des unteren Mantelendes.
Show it:
  • Figure 1 is a side view of the suspensions Device in the cutout,
  • FIG. 2 shows a plan view of the lower edge of the support rail according to section AB of FIG. 1 (on an enlarged scale),
  • FIG. 3 shows an cross section through the tubular composite body before pressing,
  • FIG. 4 shows a cross section through the deformed and welded composite body with cathode sheet,
  • 5 shows a cross section of the composite body deformed without cutting along the line CD of FIG. 2 (on an enlarged scale),
  • FIG. 6 shows a side view of the rail end of the suspension device with cathode, the end of the support rail resting on the current contact of the electrolysis container,
  • 7 shows a side view corresponding to FIG. 6 with another embodiment of the recess of the lower jacket end.

In Fig. 1 ist das Kathodenblech 1 mit dem Edelstahlmantel 2, der das Kupferhohlprofil 3 umschließt, verschweißt. Am Ende der Trageschiene liegt das Kupferprofil infolge der Ausnehmung bzw. Ausklinkung im Mantel als Kontaktstelle offen.In Fig. 1, the cathode sheet 1 is welded to the stainless steel jacket 2, which encloses the hollow copper profile 3. At the end of the support rail, the copper profile is exposed as a contact point due to the recess or notch in the jacket.

In Fig. 2 ist in der Draufsicht von unten ein Schnitt entlang der Linie A-B der Fig. 1 dargestellt. Im Bereich des Verbundes von Kathodenblech 1 mit dem Mantel 2 ist mit Bezugszeichen 4 eine kontaktverbessernde Körnerreihe angedeutet.In Fig. 2, a section along the line A-B of Fig. 1 is shown in plan view from below. In the area of the connection of the cathode sheet 1 with the jacket 2, a contact-improving row of grains is indicated by reference number 4.

Fig. 3 zeigt einen Verbundkörper aus einem Kupferrohr 3 mit einer Ummantelung 2 aus einem Edelstahlrohr vor der spanlosen Formgebung.Fig. 3 shows a composite body made of a copper tube 3 with a casing 2 made of a stainless steel tube before the non-cutting shaping.

In Fig. 4 ist die ovale Trageschiene aus Verbundrohr mit dem Kathodenblech im Schnitt nach der spanlosen Formgebung dargestellt. Das Kathodenblech 1 ist über die Schweißnaht 7 mit der Ummantelung 2 verbunden. Die Schweißstellen 6 dichten den Übergang Kupferprofil/Edelstahlmantel an der Ausnehmung im Mantel diffusionsdicht ab. Bezugszeichen 5 gibt eine Schweißnaht an, die einen Längsschlitz in der oberen Mantellinie des Edelstahlprofils abdichtet und einen Stromübergang vom stromführenden Kernprofil zum Mantelprofil bewirkt.In Fig. 4, the oval support rail made of composite pipe with the cathode plate is shown in section after the non-cutting shaping. The cathode sheet 1 is connected to the casing 2 via the weld seam 7. The welds 6 seal the transition copper profile / stainless steel jacket at the recess in the jacket diffusion-tight. Reference number 5 indicates a weld seam which seals a longitudinal slot in the upper surface line of the stainless steel profile and causes a current transfer from the current-carrying core profile to the surface profile.

Fig. 5 ist ein Schnitt entlang der Linie C-D der Fig. 2. Mit 4 ist eine kräftige Körnung bezeichnet, die auf die Ummantelung 2 und das innere Hohlprofil 3 einwirkt und einen zusätzlichen Kontaktpunkt schafft.Fig. 5 is a section along the line C-D of Fig. 2. With 4 a strong grain is designated, which acts on the casing 2 and the inner hollow profile 3 and creates an additional contact point.

In Fig. 6 ist in einer Seitenansicht der Endteil der Aufhängevorrichtung dargestellt. Der Verbundkörper aus Kupferhohlprofil 3 und Edelstahlmantel 2, durch Schweißungen 6 mit diesem verbunden, liegt mit dem mantelfreien Teil auf der Stromschiene 8 der Wandung 9 des Elektrolysebehälters auf.6 shows a side view of the end part of the suspension device. The composite body made of hollow copper profile 3 and stainless steel jacket 2, connected to it by welds 6, lies with the jacket-free part on the conductor rail 8 of the wall 9 of the electrolysis container.

Die Darstellung in Fig. 7 entspricht derjenigen der Fig. 6, jedoch mit der Ausnahme, daß das untere Mantelende eine nach außen und zur Profilachse ansteigende Ausnehmung aufweist.The representation in FIG. 7 corresponds to that of FIG. 6, but with the exception that the lower jacket end has a recess that rises outwards and towards the profile axis.

Claims (6)

1. A current-feeding cathode-mounting device comprising a metal -sheathed carrying rail of copper and a permanent cathode plate consisting of the same material as the sheath and joined by welding at least along part of a longitudinal edge, wherein at least an end portion of the rail is unsheathed at least along part of its extent, characterized in that the carrying rail consists of a hollow copper section, the sheath consists of special steel, the sheath is joined to the carrying rail by a diffusion-preventing non-porous weld, and the permanent cathode of special steel is joined to the sheath by an interrupted seam weld.
2. A current-feeding mounting device for cathodes according to claim 1, characterized in that the carrying rail consists of a copper tube.
3. A current-feeding cathode-mounting device according to claim 1 or 2, characterized in that the sheath consists of a special steel tube, which surrounds the copper tube as a snug fit and is provided, if desired, with a continuous longitudinal slit or slot.
4. A current-feeding cathode mounting device according to claims 1 to 3, characterized in that the copper tube provided with a special steel sheath has been deformed to constitute a composite having an elliptical or oval cross-section or a cross-section having two parallel sides, and the major axis of said cross-section lies in the plane of the cathode plate.
5. A current-feeding cathode-mounting device according to claims 1 to 4, characterized in that pressure contact points consisting of spot welds and/or center punch marks are provided in the sheath adjacent to the seam weld for holding the cathode plate.
6. A current-feeding cathode-mounting device according to claims 3 to 5, characterized in that the continuous longitudinal slot formed in the sheath is filled throughout its length with a weld bead in order to provide a more uniform flow of current.
EP85200855A 1984-09-19 1985-05-29 Current-supplying suspension device for cathodes Expired EP0175395B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85200855T ATE30605T1 (en) 1984-09-19 1985-05-29 POWER SUPPLY SUSPENSION DEVICE FOR CATHODE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843434278 DE3434278A1 (en) 1984-09-19 1984-09-19 ELECTRICAL SUSPENSION DEVICE FOR CATHODES
DE3434278 1984-09-19

Publications (2)

Publication Number Publication Date
EP0175395A1 EP0175395A1 (en) 1986-03-26
EP0175395B1 true EP0175395B1 (en) 1987-11-04

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ID=6245719

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EP85200855A Expired EP0175395B1 (en) 1984-09-19 1985-05-29 Current-supplying suspension device for cathodes

Country Status (9)

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US (1) US4647358A (en)
EP (1) EP0175395B1 (en)
JP (1) JPS6173895A (en)
AT (1) ATE30605T1 (en)
AU (1) AU569016B2 (en)
DE (2) DE3434278A1 (en)
ES (1) ES295679Y (en)
FI (1) FI78739C (en)
PL (1) PL142261B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4241485C1 (en) * 1992-12-09 1994-03-17 Siemens Ag Cathode for copper@ electrorefining or electrowinning - comprises steel plate welded to copper@ hanger bar surface by nickel@- copper@ weld metal

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1263627A (en) * 1986-02-06 1989-12-05 Kidd Creek Mines Ltd. Cathode hangers
NL8700537A (en) * 1987-03-05 1988-10-03 Gerardus Henrikus Josephus Den CARRIER FOR ANODE AND / OR CATHODIC PLATES IN ELECTROLYTIC REFINING OF METALS AND A METHOD OF MANUFACTURING SUCH A CARRIER.
JP2615863B2 (en) * 1988-06-20 1997-06-04 三菱マテリアル株式会社 Cathode plate for electrolysis
GB2250629A (en) * 1990-11-23 1992-06-10 Chloride Silent Power Ltd Battery of high temperature cells
BE1004728A3 (en) * 1991-04-18 1993-01-19 Solvay Electrical conductor, method for an electrical conductor and electrode for electrolysis cell.
DE9309768U1 (en) * 1993-07-01 1993-11-04 Metzka Gmbh Contacting device for a circuit board frame of an electroplating system
US5492609A (en) * 1994-10-21 1996-02-20 T. A. Caid Industries, Inc. Cathode for electrolytic refining of copper
US5584975A (en) * 1995-06-15 1996-12-17 Eltech Systems Corporation Tubular electrode with removable conductive core
US5976333A (en) * 1998-01-06 1999-11-02 Pate; Ray H. Collector bar
FI108546B (en) * 1998-09-24 2002-02-15 Outokumpu Oy Method for making cathode suspension rod
DE10003012A1 (en) * 2000-01-25 2001-07-26 Km Europa Metal Ag Cathode arrangement
AUPQ584800A0 (en) * 2000-02-25 2000-03-16 Comalco Aluminium Limited An electrical reduction cell
AU2001235261B2 (en) * 2000-02-25 2005-06-02 Comalco Aluminium Limited An electrolytic reduction cell and collector bar
FI110519B (en) * 2000-11-17 2003-02-14 Outokumpu Oy A method of joining a diaper member and a core member
CL2004000941A1 (en) * 2004-05-03 2005-03-11 Ind Proveedora De Partes Metal CORROSION RESISTANT UNION AREA BETWEEN COPPER AND STAINLESS STEEL OR TITANIUM, FORMED BY A FIRST COPPER-NICKEL ALLOCATION AREA, AN INTERMEDIATE AREA WITH NICKEL OR PURE NICKEL ALLOY AND A SECOND AREA OF STAINLESS STEEL-NI ALLOY
US7807028B2 (en) 2005-03-09 2010-10-05 Xstrata Queensland Limited Stainless steel electrolytic plates
US8337679B2 (en) * 2007-08-24 2012-12-25 Epcm Services Ltd. Electrolytic cathode assemblies and methods of manufacturing and using same
AP2013006860A0 (en) 2010-10-18 2013-05-31 Epcm Services Ltd Electrolytic cathode assemblies with hollow hangerbar
US20130119032A1 (en) * 2011-11-11 2013-05-16 Lincoln Global, Inc. System and method for welding materials of different conductivity
PE20150969A1 (en) * 2012-09-26 2015-07-17 Steelmore Holdings Pty Ltd A CATHODE AND METHOD OF MANUFACTURING
NL2016561B1 (en) * 2016-04-06 2017-10-17 Beheermaatschappij Clement Weert B V Cathode support for use in an electrolysis device as well as such an electrolysis device.

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2434731A (en) * 1943-11-16 1948-01-20 Baker & Co Inc Platinum sheet electrode
GB1087529A (en) * 1965-11-04 1967-10-18 Murgatroyds Salt & Chem Improvements in or relating to electrolytic diaphragm cells
DE2434214B2 (en) * 1974-07-16 1978-06-15 Imperial Metal Industries Kynoch Ltd., Witton, Birmingham (Grossbritannien) Suspension device for cathodes in electrowinning or electrorefining cells
GB1460089A (en) * 1974-11-08 1976-12-31 Imp Metal Ind Kynoch Ltd Cathode assembly for electrolysis
US4033849A (en) * 1975-05-09 1977-07-05 Diamond Shamrock Corporation Electrode and apparatus for forming the same
GB1505022A (en) * 1976-02-06 1978-03-22 Imp Metal Ind Kynoch Ltd Cathode
FR2388062A1 (en) * 1977-04-21 1978-11-17 Ugine Aciers Metal cathode for electrodeposition of metals - has V=shaped or U=shaped periphery to prevent metal deposition inside it
DE2751047C2 (en) * 1977-11-15 1980-07-03 H. Maihak Ag, 2000 Hamburg Non-dispersive infrared gas analyzer
US4121994A (en) * 1977-11-17 1978-10-24 Hooker Chemicals & Plastics Corp. Anode support means for an electrolytic cell
GB2041002B (en) * 1979-01-23 1982-12-01 Imi Kynoch Ltd Electrode suspension bars
IE49702B1 (en) * 1979-04-28 1985-11-27 Imi Kynoch Ltd Electrode
ZA817441B (en) * 1980-11-21 1982-10-27 Imi Kynoch Ltd Anode
US4373654A (en) * 1980-11-28 1983-02-15 Rsr Corporation Method of manufacturing electrowinning anode
US4391695A (en) * 1981-02-03 1983-07-05 Conradty Gmbh Metallelektroden Kg Coated metal anode or the electrolytic recovery of metals

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4241485C1 (en) * 1992-12-09 1994-03-17 Siemens Ag Cathode for copper@ electrorefining or electrowinning - comprises steel plate welded to copper@ hanger bar surface by nickel@- copper@ weld metal

Also Published As

Publication number Publication date
ES295679Y (en) 1987-11-01
JPS6173895A (en) 1986-04-16
FI852068L (en) 1986-03-20
FI78739C (en) 1989-09-11
ES295679U (en) 1987-03-16
PL142261B2 (en) 1987-10-31
FI852068A0 (en) 1985-05-23
AU4758985A (en) 1986-03-27
ATE30605T1 (en) 1987-11-15
AU569016B2 (en) 1988-01-14
PL255397A2 (en) 1986-07-15
US4647358A (en) 1987-03-03
EP0175395A1 (en) 1986-03-26
DE3434278A1 (en) 1986-04-17
FI78739B (en) 1989-05-31
DE3560912D1 (en) 1987-12-10

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