JPS62218593A - Electrolytic cell - Google Patents

Abstract

PURPOSE:To improve the uniformity of the current distribution of cathode and anode plates in an electrolytic cell by electrically connecting the right and left opposite sides of the plates of the same polarity to each other via auxiliary conductors and providing contact points at two points. CONSTITUTION:Respective anodes 3 and cathodes 3 which are set in plural sheets in the electrolytic cell 1 are held in contact with the conductors 2a or 2b of respectively the same polarity. The respective anodes 3 and cathodes 4 are further laid with the auxiliary conductors 6 insulated 5 from the conductors of the opposite polarity thereof on said opposite polarity conductors even on the conductor 2b or 2a side of the opposite polarity. The plates are imposed on the auxiliary conductor 6 and the auxiliary conductors 6 are electrically conducted to each other. For example, the long auxiliary conductors 6a, 6b integrally formed to a comb plate shape at the inter-plate distance of the same polarity are laid on the electrical insulator 5 on the conductors 2a, 2b. The three layers; the conductors 2, the insulators 5 and the auxiliary conductors 6 are thus constituted to a sandwich type.

Description

[Detailed description of the invention] (a) Technical field The present invention provides an anode side conductor on one side facing the upper edge of the tank.
In addition, when performing electrolysis by alternately mounting and arranging a plurality of anode plates and cathode plates in an electrolytic cell with a cathode side conductor on the other side,
This invention relates to an electrolytic cell with improved current distribution between negative and anode plates.

(b) Conventional technology Conventionally, electrode plates (anode, cathode) in electrolytic smelting method
Various methods have been used to connect the current-carrying conductor (busbar) to the electrode plate, such as the WaIker method and the Anaconda method, but in all of these methods, both the anode and the cathode are connected to the tank. - ■ - This is done by contacting only one place with the conductor provided on the edge.

That is, in the conventional contact method in electrolysis, as shown in Figure i3, for example, current is applied from one shoulder of each anode 3 (the right end in the figure) through contact with the conductor 2a, and the current flows through the electrolyte in the electrolytic cell 1. A conductor 2b in which current flows through each adjacent cathode 4 and contacts the opposite shoulder (the left end in the figure) of the cathode 4.
More current flows out.

However, if each electrode plate 3, 4 is in contact with the corresponding conductor 2a or 2b only at one point, foreign matter may get mixed into the contact area between the conductor and the electrode plate, or an oxide film may be formed. Due to these factors, the conduction of electricity becomes poor, and in some cases, it is not uncommon for the electrode plates in front of the insulation to not conduct electricity at all.

If the current flow through the electrode plates becomes poor or the electrode becomes insulated, the current distribution between the electrode plates in the electrolytic cell becomes uneven, resulting in uneven amount of electrodeposition on the cathode, deterioration of the electrodeposited surface, and even worse. This causes a decrease in current efficiency and a deterioration in the quality of electrodeposited materials, which has become a very big problem in electrolytic smelting.

(C) Disclosure of the Invention In order to solve such problems, the present invention replaces the conventional electrode plates that were in contact with the conductor on one side of the left and right sides with an auxiliary conductor on the opposite left and right sides of the plates with the same polarity. The object of the present invention is to provide a novel electrolytic cell in which the number of contact points is reduced to two by electrically connecting them to each other through the electrode plates, thereby improving the current distribution between the electrode plates.

That is, the present invention provides an electrolytic cell in which an anode-side conductor is disposed on one side and a cathode-side conductor is placed on the other side facing each other at the upper edge of the cell, -I;
An electrolytic cell in which an auxiliary conductor is mounted via an electrical insulator at a portion of the channel where a polar plate of opposite polarity to that of the conductor is to be mounted, and the auxiliary conductors are electrically connected to each other. It is.

Hereinafter, the electrolytic cell according to the present invention will be described in detail.

In the present invention, a plurality of anodes 3. The cathode 4 is not only in contact with the conductor 2a or 2b of the same polarity, but also with the conductor 2b of the opposite polarity.
Alternatively, on the side 2a, an auxiliary conductor 6 insulated from the opposite polarity conductor is placed on the opposite polarity conductor, a pole plate is placed on this auxiliary conductor 6, and the auxiliary conductors 6 are mutually connected. It is electrically connected to.

For example, as shown in Figs. 1 and 2, on top of the electric insulator 5 which is provided on both the grooves 2a and zb in the same manner as in the past, a comb-like plate is formed integrally with the distance between the electrode plates of the same polarity. The conductor 2, the insulator 5, and the auxiliary conductor 6 are arranged in a three-layer sandwich type. 2a and the auxiliary conductor 6, and the right and left shoulders of each cathode 4 are mounted in contact with the conductor 2b and the auxiliary conductor 6a, so that current always flows from the right and left shoulders of each anode 3. It enters and exits from the left and right shoulders of each cathode 4.

Therefore, for example, since the anodes 3 are all connected to each other on the electric insulator 5 at their left and right shoulder portions (the left end in the figure) via the auxiliary conductor 6b, it is assumed that some of the anodes 3 are connected to the conductor 2a. Even if there is a poor contact, the auxiliary conductor 6
Since current flows reliably from the b side to the defective anode, electrolysis continues on the anode as well. This also applies to the cathode 4.

The auxiliary conductor 6 is a single sheet that covers each insulator 5 as shown in the figure (however, the insulator 5 may be omitted in the middle part of the auxiliary conductor 6 and floated from the conductor surface of the opposite polarity). The auxiliary conductors 6 may be placed on each insulator 5 and connected to each other with electric wires instead of being formed into a comb plate shape. Furthermore, the auxiliary conductors 6 may be provided only on the conductor 2a or 2bJ- of one polarity. However, as shown in the attached diagram, both the left and right conductors 2
By providing them on a and 2b, a more complete current distribution can be achieved. Furthermore, it goes without saying that the present invention can be applied to all types of electrolysis such as electrolysis of aqueous solutions in addition to metal electrolysis.

(d) Example Lead electrolytic refining was carried out by the method shown in FIGS. 1 and 2 in which an auxiliary conductor was placed on the bipolar conductors of the electrolytic cell via an electrical insulator. As a result, we were able to obtain extremely good results as shown in the following table, compared to the case using a conventional electrolytic cell as shown in FIG.

Electrolytic conditions: Electrolyte Pb concentration 100g/fL Free acid concentration (Ht SiF o ) 80g/current density
143A/m2 Table (E) Effects of the Invention The electrolytic cell of the present invention is constructed as described above, and the uniformity of the current distribution between the negative and positive picture electrode plates in the electrolytic cell is significantly improved compared to the conventional one, so that the current efficiency is improved. Furthermore, in electrolytic smelting of metals, it is possible to improve the quality of electrolyzed products, and the structure is simple and easy to manufacture, which has great effects.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an example of an electrolytic cell according to the present invention, and FIG.
The figure is a longitudinal sectional front view of a part of FIG. 1, and FIG. 3 is a plan view of a conventional electrolytic cell. Symbol explanation 1 - Electrolytic cell body 2 - Conductor (bus bar) 3 - Anode 4 - Cathode 5 - Insulator 6 - Auxiliary conductor Patent Applicant Dowa Mining Co., Ltd. Figure 1

Claims (2)

[Claims] (1) In an electrolytic tank in which an anode conductor is placed on one side and a cathode conductor is placed on the other side facing each other at both the left and right upper edges of the tank, a plate of opposite polarity to the conductor is mounted on the conductor. 1. An electrolytic cell characterized in that an auxiliary conductor is mounted on the opposite part via an electrical insulator, and the auxiliary conductors are electrically connected to each other. (2) The electrolytic cell according to claim 1, wherein the auxiliary conductor is integrated into a comb plate shape by a conductor with a distance between plates of the same polarity.