EP0153512B1 - Process for manufacturing a homogeneous solder joint for the carriers for anode plates - Google Patents
Process for manufacturing a homogeneous solder joint for the carriers for anode plates Download PDFInfo
- Publication number
- EP0153512B1 EP0153512B1 EP84201952A EP84201952A EP0153512B1 EP 0153512 B1 EP0153512 B1 EP 0153512B1 EP 84201952 A EP84201952 A EP 84201952A EP 84201952 A EP84201952 A EP 84201952A EP 0153512 B1 EP0153512 B1 EP 0153512B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- lead
- backing
- anode plate
- homogeneous
- tin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/08—Casting in, on, or around objects which form part of the product for building-up linings or coverings, e.g. of anti-frictional metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
- B22D21/02—Casting exceedingly oxidisable non-ferrous metals, e.g. in inert atmosphere
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electrolytic Production Of Metals (AREA)
- Electroplating Methods And Accessories (AREA)
Description
,Die Erfindung betrifft ein Verfahren zur Herstellung der homogenen Verbleiung eines vorzugsweise aus Kupfer bestehenden, verzinnten und mit reduzierender Flamme vorgewärmten Trägers für eine aus gewalztem Blei bzw. Bleilegierungen gebildete Anodenplatte für Elektrolyseanlagen, wobei der Träger in eine Gießform eingelegt und eine aus Blei bzw. Bleilegierung bestehende Schmelze am Träger angegossen wird. Die homogene Verbleiung der Träger für Anodenplatten dient dem Oberflächenschutz gegen den durch die Säuren des Elektrolysebades verursachten Korrosionsangriff. Der Bleiüberzug wird üblicherweise durch Aufschmelzen mittels einer Zwischenlegierung in der Weise mit dem Träger verbunden, daß nach dem Reinigen der zu verbleienden Oberflächen diese mit einer 15 bis 50 Jlm dicken Schicht verzinnt werden, um eine wirksame Verbindung des Bleiüberzugs mit dem Träger zu erzielen. Der verzinnte Träger wird anschließend vorgewärmt und das Blei mittels Gasbrenner, z.B. Schweiß- oder Lötbrenner, auf den zu beschichtenden Träger homogen aufgeschmolzen. Als Brenngas dient ein Gemisch aus Sauerstoff mit Erdgas oder mit Wasserstoff. Um eine Anreicherung des Sauerstoffs im Blei zu vermeiden, wird die Flamme reduzierend eingestellt. Sie wird so geführt, daß der Flammenkern die Schmelze durchdringt, wobei sich das Blei mit der Zinnschicht legiert. Beim Durchdringen des Flammenkerns durch die Schmelze werden Oxide und Fremdstoffe an die Oberfläche gespült und müssen von dort entfernt werden. Nach dem Fertigstellen des Bleiüberzuges müssen rauhe und unebene Stellen an der Oberfläche mit Hilfe der Brennerflamme geglättet werden. Die bei diesem Verfahren an der Oberfläche sich bildenden Risse, Löcher, Vorsprünge oder grobe Unebenheiten müssen durch entsprechende Nachbearbeitung beseitigt werden. Ebenso ist darauf zu achten, daß der Bleiüberzug porenfrei bleibt.The invention relates to a method for producing the homogeneous lead of a support, preferably made of copper, tinned and preheated with a reducing flame, for an anode plate for electrolysis systems formed from rolled lead or lead alloys, the support being inserted into a casting mold and one made of lead or Lead alloy existing cast is cast on the carrier. The homogeneous lead of the supports for anode plates serves to protect the surface against the corrosion attack caused by the acids in the electrolysis bath. The lead coating is usually connected to the support by melting with an intermediate alloy in such a way that after cleaning the surfaces to be leaded they are tinned with a 15 to 50 μm thick layer in order to achieve an effective connection of the lead coating to the support. The tin-plated carrier is then preheated and the lead is burned using a gas burner, e.g. Welding or soldering torch, homogeneously melted onto the substrate to be coated. A mixture of oxygen with natural gas or with hydrogen serves as the fuel gas. In order to avoid an accumulation of oxygen in the lead, the flame is reduced. It is guided in such a way that the flame core penetrates the melt, the lead alloying with the tin layer. When the flame core penetrates through the melt, oxides and foreign substances are flushed to the surface and must be removed from there. After completing the lead coating, rough and uneven areas on the surface must be smoothed using the burner flame. The cracks, holes, protrusions or rough bumps that form on the surface during this process must be removed by appropriate reworking. It is also important to ensure that the lead coating remains pore-free.
In der GB-A 2 001 347 ist eine Bleianode beschrieben, deren Träger aus mit Kupfer überzogenem Stahl besteht. Auf dem Kupferüberzug befindet sich eine Schicht aus Zinn oder Lötmaterial, auf die eine Bleischicht gegossen und mit der ein Bleiblech durch Löten oder Schweißen verbunden wird.GB-A 2 001 347 describes a lead anode, the support of which consists of steel coated with copper. There is a layer of tin or solder material on top of the copper coating, onto which a layer of lead is poured and to which a lead sheet is connected by soldering or welding.
Es ist die Aufgabe der vorliegenden Erfindung, ein Verfahren zu schaffen, mit dem die Träger für die aus Blei bzw. Bleilegierungen bestehenden gewalzten Anodenplatten mit vergleichsweise geringem Aufwand mit einer homogenen Verbleiung einheitlicher Schichtdicke und frei von Fehlstellen und Poren sowie mit glatter Oberfläche in einem Arbeitsgang überzogen werden können.It is the object of the present invention to provide a method with which the supports for the rolled anode plates consisting of lead or lead alloys can be comparatively easily and with a homogeneous lead of uniform layer thickness and free of imperfections and pores as well as with a smooth surface in one operation can be covered.
Die Lösung dieser Aufgabe besteht darin, daß der Träger auf die Fließtemperatur des Zinns vorgewärmt und die Gießform mittels reduzierter Flamme vorgewärmt wird und daß die aus gewalztem Material bestehende Anodenplatte mit einem ihrer Randbereiche in den Blei- bzw. Bleilegierungsüberzug des Trägers miteingegossen wird.The solution to this problem is that the carrier is preheated to the flow temperature of the tin and the casting mold is preheated by means of a reduced flame, and that the anode plate made of rolled material is cast with one of its edge regions into the lead or lead alloy coating of the carrier.
Der Träger ist mit Ausnahme seiner Aufhängepunkte allseitig von der Bleischmelze umspült. Durch die homogene Verbleiung kann eine einheitliche Schichtdicke mit glatter Oberfläche, die fehstellen- und porenfrei ist, in einem Arbeitsgang hergestellt werden. Das üblicherweise angewendete Verschweißen der Anodenplatte mit der homogenen Verbleiung des Trägers entfällt.With the exception of its suspension points, the carrier is surrounded by the lead melt on all sides. Thanks to the homogeneous lead, a uniform layer thickness with a smooth surface that is free of imperfections and pores can be produced in one operation. The usual welding of the anode plate with the homogeneous lead of the carrier is not necessary.
Zweckmäßigerweise wird der verzinnte Träger im kalten Zustand mit einem entsprechenden Lötwasser, das eine desoxidierende Wirkung während der Vorwärmung des Trägers ausübt, benetzt. Die reduzierende Flamme verhindert eine erneute Oxidation des Zinns.The tinned carrier is expediently wetted in the cold state with an appropriate soldering water which has a deoxidizing effect during the preheating of the carrier. The reducing flame prevents the tin from re-oxidizing.
Die Anwendung des erfindungsgemäßen Verfahrens bietet sich besonders dann an, wenn die Träger der Anodenplatten mit einer kalziumhaltigen Bleilegierung homogen verbleit werden sollen, um dadurch beispielsweise den Einsatz von antimonhaltigen Bleilegierungen für die homogene Verbleiung wegen der Gefahr der Vergiftung des Elektrolyten durch Antimon zu vermeiden. Die Herstellung homogener Verbleiungen aus kalziumhaltigen Bleilegierungen mittels Gasbrennern ist äußerst schwierig und im Ergebnis technisch nicht befriedigend, weil kalziumhaltige Bleilegierungen die Eigenschaft haben, in Anwesenheit von Luft stark abzubrennen.The method according to the invention is particularly useful when the supports of the anode plates are to be lead-coated homogeneously with a lead alloy containing calcium, in order to avoid, for example, the use of lead alloys containing antimony for the homogeneous lead because of the risk of poisoning the electrolyte with antimony. The production of homogeneous lead from calcium-containing lead alloys by means of gas burners is extremely difficult and the result is not technically satisfactory because calcium-containing lead alloys have the property of burning strongly in the presence of air.
Dabei hat es sich als sinnvoll erwiesen, wenn der einzugießende Randbereich der Anodenplatte beim Eingießen einige Millimeter über der gegenüberliegenden Fläche des Trägers gehalten wird, und nach einem weiteren Merkmal der Erfindung der einzugießende Randbereich der Anodenplatte keilförmig gestaltet ist, so daß sich keine Gasblasen in diesem Bereich daran festsetzen können.It has proven to be useful if the edge area of the anode plate to be poured in is held a few millimeters above the opposite surface of the support during casting, and according to a further feature of the invention, the edge area of the anode plate to be poured in is wedge-shaped so that no gas bubbles form in it Area can fix on it.
Claims (2)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3407214 | 1984-02-28 | ||
| DE19843407214 DE3407214A1 (en) | 1984-02-28 | 1984-02-28 | METHOD FOR PRODUCING THE HOMOGENEOUS LEADING OF THE CARRIER FOR ANODE PLATES |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0153512A2 EP0153512A2 (en) | 1985-09-04 |
| EP0153512A3 EP0153512A3 (en) | 1987-08-26 |
| EP0153512B1 true EP0153512B1 (en) | 1989-12-20 |
Family
ID=6229056
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP84201952A Expired EP0153512B1 (en) | 1984-02-28 | 1984-12-28 | Process for manufacturing a homogeneous solder joint for the carriers for anode plates |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0153512B1 (en) |
| DE (2) | DE3407214A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI114554B (en) * | 2000-10-17 | 2004-11-15 | Lapmet Oy | Method for Coating an Electrode for Stainless Steel Annealing Electrolysis |
| WO2014068410A1 (en) * | 2012-10-29 | 2014-05-08 | Zimco Group (Pty) Ltd | Anode for use in the recovery of metals by electrolysis |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1181142A (en) * | 1957-08-13 | 1959-06-11 | Const Mecaniques De Stains Soc | Manufacturing process for plates and other lead elements reinforced with mineral fibers |
| US4050961A (en) * | 1974-11-22 | 1977-09-27 | Knight Bill J | Method for casting anodes |
| GB2001347A (en) * | 1977-07-20 | 1979-01-31 | Imp Metal Ind Kynoch Ltd | Electrode and hanger bar therefor |
| US4373654A (en) * | 1980-11-28 | 1983-02-15 | Rsr Corporation | Method of manufacturing electrowinning anode |
| JPS592582B2 (en) * | 1982-11-17 | 1984-01-19 | 新神戸電機株式会社 | casting equipment |
-
1984
- 1984-02-28 DE DE19843407214 patent/DE3407214A1/en not_active Withdrawn
- 1984-12-28 EP EP84201952A patent/EP0153512B1/en not_active Expired
- 1984-12-28 DE DE8484201952T patent/DE3480768D1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| EP0153512A3 (en) | 1987-08-26 |
| DE3407214A1 (en) | 1985-08-29 |
| DE3480768D1 (en) | 1990-01-25 |
| EP0153512A2 (en) | 1985-09-04 |
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