JP2017179405A - Copper bus bar - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method, where increment in electric resistance may be suppressed upon electrorefining so as to prevent reduction in product efficiency.SOLUTION: A copper bus bar of the present invention is a copper bus bar 1 of copper or copper alloy arranged between 2 electrorefining tanks in electrorefining tanks where anodes and cathodes used in a facing manner to the anodes are alternatively arranged, which is formed with one plate member, which comprises a plurality of anode beam contacting part 11 contacting to anode beams 21 and a plurality of cathode beam contacting parts 12 contacting to cathode beams 22, which, in plan view, has a plate shape comprising regular projections/recessions on one end part in a direction orthogonal to longitudinal direction of the copper bus bar 1, the projecting parts are formed by the anode beam contacting parts 11, and the recessed parts are formed as a gap between adjacent anode beam contacting parts 11.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a copper bus bar used for electrolytic refining of copper or nickel, and more particularly to a copper bus bar capable of reducing the number of contacts with an anode beam or a cathode beam and suppressing an increase in electric resistance.

  In electrolytic refining of copper and nickel, a general method is to use an insoluble anode or target metal anode as an anode and a target metal seed plate as a cathode (cathode) to suspend them alternately in an electrolytic cell and energize in an electrolytic bath. (For example, refer to Patent Document 1).

  A seed plate serving as a cathode for electrolytic purification is obtained by performing the same electrolytic treatment using a base plate made of titanium, stainless steel or the like as a cathode, and peeling the electrodeposit from the base plate when the target metal is thinly electrodeposited. In order to use this seed plate as a cathode for electrolytic purification, a ribbon obtained by cutting the same seed plate into a loop shape is used, and the seed plate is attached by being suspended from the cathode beam.

  As described above, the cathode for cathode purification (cathode plate) used as a seed plate is inserted into the electrolytic cell using the cathode beam so that it is alternately parallel to the insoluble anode as the anode and the target metal anode. Be placed. Specifically, for example, 50 anodes and 49 cathodes are alternately arranged in parallel per electrolytic cell.

  In electrolytic refining of copper and nickel, after depositing the target metal to a predetermined thickness on the cathode seed plate arranged as described above, the cathode is lifted from the electrolytic cell, the cathode beam is extracted, and It is shipped as a product with the mark attached, and a new cathode seed plate is inserted and production is carried out sequentially.

  Now, a bus bar is provided on the tank wall of the electrolytic cell, and a metal fitting for fixing the anode and a metal fitting for receiving the cathode beam are arranged on the bus bar. A current can be passed from the cathode beam receiving bracket to the bus bar through the contact surface and from the bus bar to the anode fixing bracket through the contact surface. Therefore, it is necessary to maintain a good electrical contact state at each electrical contact portion between the cathode beam receiving bracket and the bus bar and between the bus bar and the anode fixing bracket.

  However, an oxide or sulfate film is formed on the cathode beam bracket due to adhesion of an electrolyte or the like during the electrolytic operation, and between the cathode beam bracket and the bus bar, the anode fixing bracket and the bus bar In the meantime, a similar film is formed.

  If the film is left in a state where such a film is formed, the electrical resistance increases, and accordingly, the cathode beam and the cathode beam bracket, the cathode beam bracket and the bus bar, the bus bar and the anode fixing bracket, respectively. A voltage drop occurs at the contact portion, resulting in an increase in power consumption and uneven current distribution in the tank.

  Further, if the current distribution is not uniform, local current concentration occurs, so that the electrodeposit is in a dendritic form, and a short circuit occurs, resulting in a decrease in current efficiency. Furthermore, if the voltage drop occurs excessively, the bus bar may be deformed due to heat generation. When the deformation occurs, the bus bar needs to be replaced, so that the production efficiency is extremely reduced and the work load is significantly increased. It has become a big problem.

  Although it is ensured that the generated film is removed by washing with an acidic solution and polishing, and the cleanliness of the electrical contact part is increased, it is difficult to maintain the effect over a long period of time in any treatment. Therefore, further improvement is required.

  Patent Document 2 discloses a technique for chemically reducing current variation by keeping the state of an electrical contact portion between an electrode and a bus bar in an electrolytic cell clean. Specifically, the contact portion between the anode and cathode electrodes and the conductive member was chemically polished with sulfuric acid having a concentration of 20% and then washed with water, and the electrode was placed on the bus bar before the washing portion was dried, and was energized. Immediately after that, the periphery of the contact portion is washed with additional water.

Japanese Patent Laying-Open No. 2015-137366 JP-A-8-239790

  This invention is proposed in view of such a situation, and it aims at providing the method of suppressing the increase in the electrical resistance at the time of electrolytic refining, and preventing the fall of production efficiency. .

  In order to solve the above-described problems, the present inventor has intensively studied the bus bar provided on the tank wall of the electrolytic cell. As a result, it has been found that by improving the shape of the bus bar to a specific shape, the number of contact points between metals can be reduced, and an increase in electrical resistance can be effectively suppressed, and the present invention has been completed.

  (1) The first invention of the present invention is an electrolytic cell in which a plurality of anodes and a plurality of cathodes used in opposition to the anode are alternately installed. A copper bus bar made of an alloy comprising a plurality of anode beam contact portions that are in contact with the anode beam and a plurality of cathode beam contact portions that are in contact with the cathode beam. The copper bus bar has a plate-like shape having regular irregularities at one end in a direction perpendicular to the longitudinal direction of the copper bus bar, and the anode beam contact portion forms a convex portion, and the adjacent anode beam contact It is a copper bus bar which becomes a recessed part between parts.

  (2) According to a second aspect of the present invention, in the first aspect, when viewed from a side surface perpendicular to the longitudinal direction, the anode beam contact portion has a shape rising approximately 90 degrees from a horizontal plane, A copper bus bar in contact with the anode beam at the surface of the raised portion.

  (3) According to a third aspect of the present invention, in the second aspect of the invention, in the anode beam contact portion, the anode beam is contact-fixed via an anode beam fixing member bolted to the anode beam contact portion. It is a copper bus bar.

  (4) According to a fourth aspect of the present invention, in the first to third aspects, the cathode beam contact portion has a predetermined angle when viewed from a side surface parallel to the longitudinal direction of the copper bus bar. This is a copper bus bar provided with a V-shaped groove.

  According to the present invention, it is possible to prevent an increase in electrical resistance during electrolytic purification and prevent a decrease in production efficiency.

It is a figure for demonstrating the structure of a copper bus bar, (A) is a top view, (B) is a side surface (side surface perpendicular | vertical to a longitudinal direction) of a copper bus bar, Comprising: A copper bus bar and an anode beam contact part It is a figure which shows each connection relationship with a cathode beam contact part. It is the side view seen from the side parallel to the longitudinal direction of a copper bus bar. It is a figure which shows the structure of the conventional copper bus bar, (A) is a top view, (B) is a side surface (side surface perpendicular | vertical to a longitudinal direction) of a copper bus bar, Comprising: A copper bus bar, an anode beam contact part, It is a figure which shows each connection relationship with a cathode beam contact part. It is the side view seen from the side parallel to the longitudinal direction of the conventional copper bus bar.

  Hereinafter, a specific embodiment of the present invention (hereinafter referred to as “the present embodiment”) will be described in detail with reference to the drawings. In addition, this invention is not limited to the following embodiment at all, A various change is possible in the range which does not change the summary of this invention.

[Overall structure of copper bus bar]
The copper bus bar according to the present embodiment is a bus bar installed between two battery tanks in an electrolytic cell in which a plurality of anodes and a plurality of cathodes used opposite to the anode are alternately installed. Or it is a copper bus bar which consists of copper alloys.

  FIG. 1 is a diagram for explaining the configuration of a copper bus bar, and also shows the contact relationship between an anode beam and a cathode beam. 1A is a plan view, and FIG. 1B is a side surface (side surface viewed in the longitudinal direction) of the copper bus bar, which includes a copper bus bar, an anode beam contact portion, and a cathode beam contact portion. It is a figure which shows each connection relationship of these.

  As shown in FIG. 1, the copper bus bar 1 is composed of a single plate-like member, and a plurality of anode beam contact portions 11 that contact the anode beam 21 and a plurality of cathode beam contacts that contact the cathode beam 22. Unit 12. Note that “consisting of a single plate-like member” means that an anode beam fixture or a cathode beam fixture made of another copper plate is installed and fixed on a plate-like copper bus bar as in the past. It means that it is integrally formed by one copper plate.

  The copper bus bar 1 has a plate-like shape having regular irregularities at one end in a direction perpendicular to the longitudinal direction when viewed in plan as shown in FIG. Convex portion 1A is formed, and a portion between adjacent anode beam contact portions 11 becomes concave portion 1B.

  When the copper bus bar 1 is viewed in plan, the convex portion 1A formed by the anode beam contact portion 11 and the concave portion 1B between the adjacent anode beam contact portions 11 have an uneven shape, whereby the convex portion 1A. On the other hand, the anode beam 21 is fixed in contact with the anode beam contact portion 11, and the cathode beam 22 is positioned so as not to be in contact with the copper bus bar 1 at the position of the recess 1 </ b> B.

  The cathode beam 22 does not come into contact with the copper bus bar 1 as a clearance (“C” in FIG. 1) from the height of the recess 1B to the bottom of the recess 1B. If it adjusts in the range, it will not specifically limit. Specifically, it may be appropriately determined according to the size of the electrolytic cell, the size of the anode beam and the cathode beam, etc., and may be, for example, about 25 mm to 45 mm.

  Further, the interval between the anode beam contact portions 11 constituting the adjacent convex portions 1A may be appropriately determined according to the width of the cathode beam 22 within a range where the cathode beam 22 does not contact. 50 mm to 70 mm.

  Thus, by making the copper bus bar 1 comb-like and providing a clearance so that the position where the cathode beam 22 is disposed becomes the recess 1B, the cathode beam 22 can effectively contact and short-circuit. Can be prevented.

[Anode beam contact area]
As shown in FIG. 1B, the copper bus bar 1 has a shape in which the anode beam contact portion 11 rises approximately 90 degrees (°) from the horizontal plane when viewed from the side surface perpendicular to the longitudinal direction of the copper bus bar 1. ing. Further, as shown in the side view of the copper bus bar 1 shown in FIG. 2 as viewed from the side parallel to the longitudinal direction, the anode beam contact portion 11 formed by rising approximately 90 degrees from the horizontal surface has a surface. In contact with the anode beam 11 at the surface of the raised portion.

  Further, the anode beam contact portion 11 is provided with a bolt hole 11a (see FIG. 2) for penetrating the bolt, and via the anode beam fixing member 21p to be bolted to the anode beam contact portion 11, The anode beam 21 is fixed in contact.

  As described above, in the copper bus bar 1, the anode beam is not contact-fixed by the anode beam contact portion placed on the plate-like copper bus bar as in the conventional copper bus bar, but the anode beam contact portion. The anode beam 21 is directly contact-fixed via the contact 11. Thereby, the contact location of the anode beam 21 and the copper bus bar 1 can be reduced.

[Cathode beam contact area]
As shown in FIG. 1A, the cathode beam contact portion 12 is located at the end opposite to the end of the copper bus bar 1 having an uneven shape. The cathode beam contact portion 12 is not constituted by a cathode beam fixing bracket or the like as in the prior art, but is constituted by a part of the copper bus bar 1 made of a plate-like member.

  As shown in FIG. 2, the cathode beam contact portion 12 is provided with a V-shaped groove 12 a having a predetermined angle when viewed from a side surface parallel to the longitudinal direction of the copper bus bar 1. . For example, the cathode beam 22 has a V-shaped convex portion on the surface in contact with the cathode beam contact portion 12, and the V-shaped convex portion is a V-shape provided on the cathode beam contact portion 12. The contact is fixed by fitting in the groove 12a.

  The angle of the V-shaped groove 12a is not particularly limited, but may be, for example, about 100 degrees (°) to about 130 degrees.

[Effects of copper bus bar 1]
In the electrolytic refining of copper and nickel, the target metal is electrodeposited to a predetermined thickness on the cathode seed plate, then the cathode is pulled out of the electrolytic cell, the cathode beam is pulled out and shipped as a product with a hanging hand attached. In addition, a new cathode seed plate is charged for production. As described above, when the cathode is pulled up, a new cathode is repeatedly inserted.

  In such electrolytic purification, for example, an electrolytic solution or the like adheres to a bus bar or the like, and deposits such as oxides and sulfates are generated. In normal operation, a cleaning process is performed using an acidic solution in order to remove the generated deposits. However, the surface of the component parts constituting the bus bar dissolves and the thickness gradually decreases. . Moreover, the rate of decrease is not uniform.

  When the surface gradually melts and loses uniformity, the current flowing through the bus bar or the like is biased, increasing the voltage drop and thus reducing the production efficiency.

  In this regard, in the copper bus bar 1 according to the present embodiment, a plurality of anode beam contact portions 11 that are in contact with the anode beam 21 and a plurality of cathode beams that are in contact with the anode beam 21 are configured from one plate-like member. A contact portion 12. As described above, the anode beam contact portion 11 and the cathode beam contact portion 12 are integrally formed from a single plate member made of copper or copper alloy, so that it can be easily manufactured with a small number of parts. Thus, the contact per pair of the anode beam 21 and the cathode beam 22 with respect to the copper bus bar 1 is reduced, and the contact resistance can be reduced. That is, an increase in electrical resistance can be effectively suppressed.

  Further, the copper bus bar 1 has a plate-like shape having regular irregularities at one end in a direction perpendicular to the longitudinal direction when the copper bus bar 1 is viewed in plan, and is projected by the anode beam contact portion 11. A portion 1A is configured, and a space between adjacent anode beam contact portions 11 is a recess 1B. That is, since the portion of the concave portion 1B is a position where the cathode beam 22 is disposed, the contact between the cathode beam 22 and the copper bus bar 1 can be prevented by making the concave portion 1B in this way. The occurrence of a short circuit can be effectively prevented.

  EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to the following examples.

[Example 1]
In Example 1, the copper bus bar 1 shown in the plan view of FIG. 1 and the side view parallel to the longitudinal direction of FIG. 2 is configured in the same manner as the electrolytic cell A in which a plurality of anodes and cathodes are alternately installed. It was installed between the electrolytic cell B.

  Specifically, the copper bus bar 1 is made of a copper plate of W200 mm × D15 mm × L5, 570 mm and leaves only 53 anode beam contact portions 11 to prevent the cathode beam 22 from contacting and short-circuiting. And a copper plate was cut into a comb-teeth shape (FIG. 1A).

  After cutting the copper plate, the L-shaped copper bus bar 1 was formed by bending the tip of the convex portion that has a comb-teeth shape so as to rise 90 degrees (FIG. 1B). This rising portion becomes the anode beam contact portion 11. Further, a bolt hole 11a for fixing the anode beam was formed in the anode beam contact portion 11 (FIG. 2).

  On the other hand, 53 V-shaped grooves 12a cut at 120 degrees at intervals of 110 mm pitch were cut into the cathode beam contact portion 12 (FIG. 2).

  As described above, in Example 1, the anode beam contact portion 11 and the cathode beam contact portion 12 were integrally formed using a copper plate having a predetermined size. The number of contacts per pair of the anode beam 21 and the cathode beam 22 with respect to the copper bus bar 1 was two.

  As a result of performing electrolytic treatment over a predetermined period using such a copper bus bar 1, the electrical resistance did not increase, and a decrease in production efficiency could be suppressed. This is presumably because the contact number per pair of the anode beam 21 and the cathode beam 22 with respect to the copper bus bar 1 was as small as two, so that the contact area could be reduced and the contact resistance could be reduced.

[Comparative Example 1]
In Comparative Example 1, an electrolytic cell A in which a plurality of copper bus bars 50 shown in a plan view and a side view in FIG. 3 and a side view parallel to the longitudinal direction in FIG. It installed between the electrolytic vessel B similarly comprised.

  Specifically, the copper bus bar 50 was made of a copper plate of W 200 mm × D 20 mm × L 5,570 mm. An anode beam fixing bracket 51 made of a copper plate of W50 mm × D10 mm × L200 mm was installed and fixed on the copper bus bar 50. The anode beam fixing metal fitting 51 was formed into an L shape by opening a bolt hole 51a for fixing to the copper bus bar 50 with a bolt and bending it so as to rise 90 degrees. 53 pieces of such anode beam fixing metal fittings 51 were manufactured, and all of them were fixed to the copper bus bar 50 with bolts at predetermined intervals (FIGS. 3A and 3B).

  On the other hand, a cathode beam receiving bracket 52 made of a copper plate of W20 mm × H15 mm × L5, 700 mm was installed and fixed on the copper bus bar 50. In the cathode beam bracket 52, a bolt hole (not shown) for fixing to the copper bus bar 50 with a bolt is opened, and a groove is cut at 120 degrees at intervals of 110 mm pitch at a position where the cathode beam contacts. 53 character-shaped grooves 52a were cut (FIG. 4).

  As described above, in Comparative Example 1, the anode beam fixing metal fitting 51 and the cathode beam receiving metal fitting 52 are fixed on the plate-like copper bus bar 50 by bolts. As a result, the number of contacts per pair of the anode beam 21 and the cathode beam 22 with respect to the copper bus bar 50 was four.

  As a result of performing electrolytic treatment over a predetermined period using such a copper bus bar 50, the electrical resistance increased, the copper bus bar 50 was forced to be replaced, and the production efficiency was significantly reduced. This is considered to be because the contact resistance is increased due to the large number of contacts per pair of the anode beam 21 and the cathode beam 22 with respect to the copper bus bar 50.

DESCRIPTION OF SYMBOLS 1 Copper bus bar 1A Convex part 1B Concave part 11 Anode beam contact part 12 Cathode beam contact part 21 Anode beam 22 Cathode beam

Claims (4)

In an electrolytic cell in which a plurality of anodes and cathodes used in opposition to the anode are alternately installed, a copper bus bar made of copper or a copper alloy installed between the two battery cells,
It is composed of one plate-shaped member,
A plurality of anode beam contact portions in contact with the anode beam;
A plurality of cathode beam contact portions in contact with the cathode beam,
When viewed in plan, the copper bus bar has a plate-like shape having regular irregularities at one end in a direction perpendicular to the longitudinal direction, and the anode beam contact portion forms a convex portion, and the adjacent anode A copper bus bar with a recess between the beam contact parts. The anode beam contact portion has a shape that rises approximately 90 degrees from a horizontal plane when viewed from a side surface perpendicular to the longitudinal direction, and contacts the anode beam at the surface of the raised portion. Copper busbar. 3. The copper bus bar according to claim 2, wherein the anode beam contact portion is fixed in contact with the anode beam contact portion via an anode beam fixing member bolted to the anode beam contact portion. 4. The V-shaped groove having a predetermined angle when provided from the side parallel to the longitudinal direction of the copper bus bar is provided in the cathode beam contact portion. 5. The copper bus bar described.

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