KR20000013804A - Structure of electrically contacting part of electrobath - Google Patents

Abstract

PURPOSE: A structure of an electrically contacting part of an electrobath is provided, by which the contact resistance does not increase at an electrically contacting part, the efficiency of electrolytic refining is maintained to be high, the by-product such as CuSO4 is easily removed, and the repair is easy. CONSTITUTION: The electrically contacting part of an electrobath is constructed such that a narrow and long conductive membrane (bus bar) (10) is arranged in a wall of the electrobath (200) for supplying current to anodes (1) and cathodes (2), the bus bar (10) forms a convex upper part (12) on the upper surface of a narrow and long sheet-form membrane (11) along the length direction, gold (13) is electroplated at least on the upper surface entirely or partially along the length direction. The electrically contacting part of an electrobath can be constructed such that side bus bars (30) and connection conductive materials (40) connecting each side bus bars (30) electrically are arranged along the side wall of the electrobath, gold (13) is electroplated at least on the one side contact face of the side bus bars (30) and the connection conductive materials (40), and then the side bus bars and the connection conductive materials (40) are fixed.

Description

Structure of electrical contact of electrolyzer

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to electrolytic refining techniques, such as copper electrolytic refining. In particular, for example, an anode (anode) or a negative electrode (cathode) and a bus bar (e.g. bus bar (common conductor) or structure of electrical contact with a side busbar.

Conventionally, for example, in copper electrolytic refining, the anode 1 made of a thick plate copper (99% Cu) and a cathode functioning as a vertical plate in a rectangular electrolytic cell as shown in FIG. 2) are arranged to be alternately parallel.

Moreover, the busbar 10 is arrange | positioned on the tank wall 100 of an electrolytic cell, The wheel part lA of predetermined | prescribed anode 1 produced by casting thick copper on this busbar 10, and predetermined | prescribed An end portion 3A of the crossbar (conductive rod) 3 to which the cathode 2 is attached is disposed. In general, as shown in FIG. 6, a plurality of electrolyzers 200 are arranged side by side, and the anode 1 and the cathode 2 inside the electrolyzer are powered by a current supply method (Walker method) as shown in FIG. 6. +,-).

When copper electrolytic refining is performed using such an apparatus, it is known that electrolytic efficiency will fall with time. This is because the copper sulfate solution constituting the electrolytic bath is scattered by an electrical contact such as a space between the busbar 10 and the electrode 1 (and the crossbar 3), and the copper sulfate (CuSO ₄₎ Is deposited to increase the contact resistance between the busbar and the electrode. In addition, when such copper sulfate (CuSO ₄ ) is attached to the busbar 10 or the like, it cannot be removed simply by washing with water, and thus requires grinding work and requires a long time for maintenance. Was.

In order to solve this problem, a special bus bar, which is conventionally known as a wet bus bar in which a sponge containing water is disposed on the bus bar, is employed or water is allowed to pass through a hollow tubular bus bar. Although water droplets are generated on the surface and a film of copper sulfate (CuSO ₄ ) is prevented from being formed at the contact portion, it is proposed to reduce the increase in the contact resistance between the busbar and the electrode, but none of them is sufficient.

This problem is similarly a problem that occurs not only between the electrical contact between the busbar and the electrode, but also between the sidebus bar and the connecting conductor arranged to electrically connect the electrolytic cell and the electrolytic cell, and also between the side busbar and the electrode. .

It is therefore an object of the present invention to provide a structure of an electrical contact portion of an electrolytic cell, in which there is no increase in contact resistance at the electrical contact portion of the electrolytic cell, and the electrolytic refining can always be performed with high efficiency.

Another object of the present invention is to provide a structure of the electrical contact portion of the electrolytic cell that can easily achieve the removal of substances such as copper sulfate (CuSO ₄ ) generated in the electrical contact portion of the electrolytic cell, and the maintenance of the electrical contact is easy. It is to offer.

1 is a view showing the structure of a bus bar which is an embodiment of the present invention;

2 is a diagram illustrating an embodiment of a busbar;

3 shows another embodiment of a busbar;

4 is a view showing a structure of a side bus bar and a connecting conductor according to another embodiment of the present invention;

5 is a view showing the structure of a conventional bus bar,

6 is a view showing the arrangement of the electrolytic cell used in the copper electrolytic refining to which the present invention can be applied, and a current supply system between the electrolytic cell.

<Description of the symbols for the main parts of the drawings>

1: anode 2: cathode

3: crossbar 10: bus bar (conductive member)

11 plate-like member 12 convex portion

13: gold plating 30: side busbar

40: connecting conductor 100,102: rough wall

200: electrolytic cell

This object is achieved by using the structure of the electrical contact of the electrolytic cell according to the invention. In summary, in the structure of the electrical contact portion of the electrolytic cell of the present invention, in order to supply current to the anode and the cathode disposed in the electrolytic cell, a narrow, long conductive member is provided on the wall of the electrolytic cell as a bus bar; The conductive member forms a convex shape parallel to the longitudinal direction on the upper surface of the narrow and long plate-like member forming the base portion; At least the upper surface of the said convex-shaped part is characterized by gold plating on the whole surface or partly along the longitudinal direction.

According to another aspect of the present invention, in order to electrically connect adjacent electrolyzers, side busbars and connecting conductors electrically connecting the side busbars are provided along sidewalls of the respective electrolyzers; In the electrical contact portion of the side busbar and the connecting conductor, gold plating is applied to at least one of the contact surfaces; Thereafter, the structure of the electrical contact portion of the electrolytic cell is provided, which fixes the side busbar and the connecting conductor.

According to still another aspect of the present invention, there is provided a cross bar that suspends an electrode disposed in an electrolytic cell and electrically connects with a bus bar or a side bus bar; There is provided a structure of an electrical contact portion of an electrolytic cell, characterized by gold plating at the end of a crossbar in electrical contact with at least the busbar or side busbar.

According to still another aspect of the present invention, a bus bar or a side bus bar is provided on a wall of an electrolytic cell to supply current to an anode disposed in the electrolytic cell; The anode is provided with a structure of the electrical contact portion of the electrolytic cell, characterized in that the gold plating at least in the electrical contact with the bus bar or the side bus bar.

In each of the present invention described above, the gold plating can be performed after the nickel base plating.

According to a preferred embodiment of the present invention, the electrolytic cell is an electrolytic cell used for copper electrolytic refining.

Embodiment

Hereinafter, the structure of the electrical contact portion according to the present invention will be described in more detail with reference to the drawings.

Example l

As shown in FIG. 1, the present invention can be applied to, for example, a bus bar arranged on a long wall of an electrolytic cell in copper electrolytic refining.

In more detail, the bus bar 10 is arrange | positioned on the rough wall 100 of an electrolytic cell, On the bus bar 10, the pinwheel parts lA and 1B of the anode 1 produced by casting coarse copper. ) And end portions 3A and 3B of the crossbar (conductive rod) 3 to which the cathode 2 is attached.

According to the present invention, as shown in Figs. 1 and 2, the bus bar 10 is made of a conductive member having a narrow width and a long length as a relay conductor disposed on the long wall 100 of the electrolytic cell. A narrow and long plate-shaped member 11 forming a base portion and a convex portion 12 are formed on the upper surface of the plate-shaped member 11 in parallel in the longitudinal direction. Although this convex part l2 is demonstrated in detail later, these electrodes, etc. contact | abut directly to the end part 3A of the crossbar 3 with the axle part 1A of the anode 1, and the cathode 2 attached. As a part for supporting the above, it is also possible to form and integrally form the plate-shaped member (11), but it is also possible to produce it as a separate body and to fix the plate-shaped member (11) integrally. 1 and 2, the convex portion 12 preferably has a convex curved surface. However, the convex portion 12 is not limited thereto, and the upper surface of the convex portion may be flat. The shape of can be adopted.

According to the present invention, at least the top surface portion of the convex portion l2, that is, the surface portion where the axle wheel portion 1A of the anode 1 and the end portion 3A of the crossbar 3 are in direct contact with each other is gold. (Au) Plating 13 is performed. Of course, gold plating l3 may be performed after nickel (Ni) plating as a basic treatment.

In the present embodiment, the plate-shaped conductive member 10 as the bus bar is made of a copper material, and the portion of the plate-shaped member 11 having a narrow width and a long base portion has a thickness T of 1.5 cm x width ( W) 13 cm x length (L) 570 cm. The convex portion 12 was formed into a curved shape having a radius R of 5 cm, and the height H from the plate member 11 of the convex portion 12 was 0.5 cm. Two convex portions l2 were formed at a distance of P = 10 cm from each other, and gold plating l3 was performed over a length of approximately 5 mm in both circumferential directions at the center of each convex portion 12. When the thickness of the gold plating 13 is about 1.3 μm, pinholes are generated in the plating film, which causes a problem. As a result of the research experiments of the present inventors, it was found that in order to have durability of about 1 year, a thickness of about 5 μm is required in consideration of wear.

In the case where the bus bar 10 of the present invention is actually used, it is alternately on the bus bar 10, that is, on the convex portion 12 formed in parallel, as shown in FIG. 1, for example. An electrically insulating plate 20 having a cutout 20A, such as a ceramic plate, is disposed. Accordingly, the abutment wheel portion 1A of the anode 1 and the end portion 3A of the crossbar 3, etc., positioned at the cutout portion 20A, are in electrical contact with the busbar 10, but the insulating plate 20 is In the position where it is located, that is, the abutment portion 1B of the anode 1, the end portion 3B of the crossbar 3, and the like, electrical contact with the busbar 110 is not achieved.

According to another embodiment of the present invention, the gold plating l3 of the convex portion 12 may be performed only in the region L _{l at} which the cutout portion 20A of the electrically insulating plate 20 is located. It is possible. In other words, it is preferable to make the region L ₁ very short on the upper surface of each convex portion 12, but gold-plated portions and non-plated portions may be formed, for example, at intervals of L ₁ ?

Using the bus bar 10 of the present invention having the above-described configuration, the copper sulfate (CuSO ₄ ) film was prevented from adhering to the gold plated surface of the convex portion of the bus bar 10, and the contact resistance was reduced at 20 mV at 500 A of the conventional art. Could be reduced to 5mV. The copper sulfate (CuSO ₄ ) film adhering to the surface of the gold plated part at least could be easily removed by washing with water, which was very convenient in terms of maintenance of the device.

Example 2

For example, as described above, the electrolytic cell in the electrolytic refining is provided in plural numbers. In this case, as shown in FIG. 4, the side busbars 30 arranged along the rough wall 102 provided in each tank are used. Connecting as the connecting conductor 40 is performed. Conventionally, the side bus bar 30 and the connecting conductor 40 are fixed by soldering, but this electrical contact portion is likely to corrode and the contact resistance may increase. Therefore, it is necessary to frequently perform maintenance on this part.

According to the present invention, in the electrical contact portion of the side busbar 30 and the connecting conductor 40, gold plating l3 is applied to at least one of the contact surfaces, and then both are fastened to a fastening means 50 such as a bolt nut. Fix it. As for the thickness of the gold plating 13, it turned out that the thickness of about 5 micrometers is enough in the result of the research experiment of this inventor.

By such a configuration, the electrical contact between the side busbar 30 and the connecting conductor 40 is not corroded, and the contact resistance does not increase, thereby eliminating the need for maintenance of the connecting portion at all. . Moreover, the copper sulfate (CuSO ₄ ) film etc. which were affixed on this gold plating 13 part can be easily removed by wash | cleaning with water, and also the maintenance of an apparatus became very convenient in this point.

Example 3

In the copper electrolytic refining, as described above, the cathode 2 is suspended in a crossbar (conductive rod) 3, and the end portion 3A of the crossbar 3 is shown in FIG. 10) or on the side busbar 30 as shown in FIG.

Therefore, as described above, a copper sulfate (CuSO ₄ ) film or the like is generated in the electrical contact portion between the crossbar 3 and the bus bar 10 or the side bus bar 30 to increase the contact resistance.

Usually, the crossbar 3 is made of a rod of the same material having a round or angular shape in cross section. In the present invention, at least at the end 3A of the crossbar 3, as shown in FIG. Gold (Au) plating 13 is performed on the bottom surface of 3A. Of course, it is better to perform gold plating after nickel (Ni) plating as a basic treatment. As a result of the research experiments of the present inventors, it was found that a thickness of about 5 μm is required in order to have durability of about 1 year.

With this structure, a copper sulfate (CuSO ₄ ) film is attached to the gold plated surface of the end portion 3A of the crossbar 3 at the electrical contact portion of the crossbar 3 and the busbar 10 or the side busbar 30. This is suppressed, and the contact resistance is remarkably reduced than before. In addition, the copper sulfate (CuSO ₄ ) film, which is slightly attached to the gold-plated surface of the end of the crossbar, can be easily removed by rinsing with water, which is very convenient in terms of device maintenance.

Example 4

In the copper electrolytic refining, as described above, the predetermined anode 1 is supported on the bus bar 10 as shown in FIG. 1 by the front wheel portion 1A, or as shown in FIG. 30) and are electrically connected.

Therefore, as described above, a copper sulfate (CuSO ₄ ) film or the like is generated at the electrical contact portion between the anode 1 and the bus bar 10 or the side bus bar 30 to increase the contact resistance.

In the present invention, as shown in FIG. 4, the pinwheel portion 1A of the anode 1 in electrical contact with the side busbar 30 or the convex portion l2 of the busbar 10 in FIG. 1 is electrically connected. In particular, the gold (Au) plating 13 is performed on the lower wheel portion 1A of the anode 1 in contact with the lower wheel portion 1A. Of course, gold plating may be performed after nickel (Ni) plating as a basic treatment. As a result of the research experiment of the present inventors, it turned out that the thickness of about 0.1 micrometer is enough.

With this structure, a copper sulfate (CuSO ₄ ) film adheres to the gold plated surface of the auricle wheel portion 1A of the anode 1 at the electrical contact portion between the anode 1 and the busbar 10 or the side busbar 30. This is suppressed, and the contact resistance is remarkably reduced than before. Further, the copper sulfate (CuSO ₄ ) film, which is slightly attached to the auricle gold plated surface of the anode (1), can be easily removed by washing with water, if necessary, which is very convenient in terms of device maintenance.

As described above, according to the structure of the electrical contact portion of the electrolytic cell of the present invention, since gold plating is performed on the electrical contact portion of the electrolytic cell, there is no increase in contact resistance at the electrical contact portion, and electrolytic refining can always be performed with high efficiency. At the same time, the removal of a substance such as copper sulfate (CuSO ₄ ) generated at the electrical contact portion of the electrolytic cell can be easily achieved, and the maintenance of the electrical contact portion can be easily achieved.

Claims (6)

In order to supply current to the anode and the cathode disposed in the electrolytic cell, a narrow and long conductive member is provided as a busbar on the rough wall of the electrolytic cell; This conductive member is provided with convex portions parallel to the longitudinal direction on the upper surface of the narrow and long plate-like member forming the base portion; And at least an upper surface of the convex portion is gold plated on the entire surface or partly along the longitudinal direction. In order to electrically connect adjacent electrolyzers, side busbars are provided along sidewalls of each electrolyzer and connecting conductors electrically connecting the side busbars; Gold plating at least one of the contact surfaces at the electrical contacts of the side busbars and the connecting conductors; And thereafter fixing the side busbars and the connection conductors. Suspending the electrodes disposed in the electrolytic cell, and providing a crossbar electrically connected to the busbar or the sidebusbar; Gold plating is applied to the end of the crossbar at least in electrical contact with the busbar or the sidebusbar. Installing a busbar or side busbar on the rough wall of the electrolyzer to supply current to the anode disposed in the electrolyzer; And the anode is gold plated at least in electrical contact with the busbar or side busbar. The structure of an electrical contact part of an electrolytic cell according to any one of claims 1 to 4, wherein the gold plating is performed after nickel base plating. The electrolytic cell according to any one of claims 1 to 5, wherein the electrolytic cell is an electrolytic cell used for copper electrolytic refining.