JPH033754B2 - - Google Patents

Description

[Detailed description of the invention]

(a) Technical field The present invention provides an electrolytic cell in which a plurality of anode plates and cathode plates are alternately installed in an electrolytic cell in which an anode-side conductor is disposed on one side and a cathode-side conductor is disposed on the other side facing toward the upper edge of the cell. This invention relates to an electrolytic cell that improves current distribution between cathode and anode plates when performing electrolysis in a stacked arrangement. (b) Prior art Conventionally, as a connection method between an electrode plate (anode, cathode) and a current-carrying conductor (bus bar) in the electrolytic smelting method, the Walker type or
Various methods such as the Anaconda method have been used, but
Both the anode and the cathode are connected to a conductor provided at the upper edge of the tank at only one point. That is, in the conventional contact method in electrolysis, as shown in FIG. 3, 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 current flows through each adjacent cathode 4, and the current flows out from the conductor 2b that contacts the opposite shoulder (the left end in the figure) of the cathode 4. However, if each electrode plate 3, 4 is in contact with the corresponding conductor 2a or 2b at only one place, there may be some factors such as foreign matter getting into the contact area between the conductor and the electrode plate or an oxide film being formed. This impairs the conduction of electricity, and in some cases, it is not uncommon to have insulated plates that do not conduct electricity at all. If the current flow through the plates becomes poor or the plates become insulated, the current distribution between the plates in the electrolytic cell becomes uneven, resulting in uneven amounts of electrodeposition on the cathode, deterioration of the electrodeposited surface, and even worse. This has caused 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
Conventionally, the electrode plates were in contact with the conductor at one point on each side of the left and right sides, but by electrically connecting the opposite left and right sides of the electrode plates of the same polarity to each other via an auxiliary conductor, the number of contact points is reduced to two. This provides a novel electrolytic cell in which the current distribution between the electrode plates is improved. That is, the present invention provides an electrolytic cell in which an anode-side conductor is placed on one side and a cathode-side conductor is placed on the other side facing each other at the upper edge of the cell, and a plate having a polarity opposite to that of the conductor is mounted on the conductor. This relates to an electrolytic cell in which an auxiliary conductor is mounted on the portion via an electrical insulator, and the auxiliary conductors are electrically connected to each other. Hereinafter, the electrolytic cell according to the present invention will be explained in detail. In the present invention, each of the anodes 3 and cathodes 4 set in plurality in the electrolytic cell 1 not only contacts with the conductor 2a or 2b of the same polarity, but also contacts the conductor 2b or 2a of the opposite polarity with the opposite polarity. An auxiliary conductor 6 insulated with respect to the conductor 5 is placed on the opposite polarity conductor, a polar plate is placed on this auxiliary conductor 6, and the auxiliary conductors 6 are electrically connected to each other. be. For example, as shown in FIGS. 1 and 2, on top of the electrical insulator 5 provided on both conductors 2a and 2b in the same manner as in the past, a comb plate-like structure is further formed with a distance between the plates of the same polarity. Formed long conductive auxiliary conductor 6
a, 6b, and the conductor 2, insulator 5, and auxiliary conductor 6 are configured in a three-layer sanderch type, so that each anode 3 has its left and right shoulders connected to the conductor 2a.
and the auxiliary conductor 6, and each cathode 4 has its left and right shoulders connected to the conductor 2b and the auxiliary conductor 6a.
Since the electrodes are mounted in contact with each other, current always enters from the left and right shoulder portions of each anode 3 and exits from the left and right shoulder portions of each cathode 4. Therefore, for example, since the anodes 3 are all connected to each other on the electric insulator 5 at their right and left shoulder portions (the left end in the figure) via the auxiliary conductor 6b, it is assumed that some of the anodes 3 and the conductor 2a Even if there is a poor contact between them, current will surely flow from the auxiliary conductor 6b side to the defective anode, so that electrolysis will continue for 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). Instead of being formed into a comb plate shape, the auxiliary conductors 6 may be placed on each insulator 5 and the auxiliary conductors may be connected to each other with electric wires.Furthermore, the auxiliary conductors 6 may be provided only on the conductor 2a or 2b of one polarity. However, as shown in the attached diagram, both the left and right conductors 2a
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 an 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. Electrolysis conditions: Electrolyte Pb concentration 100g/Free acid concentration ( _H2SiF6 ) 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 current distribution between the anode and negative electrode plates in the electrolytic cell is significantly improved compared to the conventional one, resulting in improved current efficiency. 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 the drawing]

FIG. 1 is a plan view showing an example of an electrolytic cell according to the present invention, FIG. 2 is a longitudinal sectional front view of a part of FIG. 1, and FIG. 3 is a plan view of a conventional electrolytic cell. Description of symbols, 1... Electrolytic cell body, 2... Conductor (bus bar), 3... Anode, 4... Cathode, 5...
...Insulator, 6...Auxiliary conductor.

Claims (1)

[Claims] 1. In an electrolytic cell 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 cell, a portion where a plate of opposite polarity to the conductor is mounted on the conductor. An auxiliary conductor is mounted on the auxiliary conductor through an electrical insulator, and the auxiliary conductor is integrated into a comb plate shape by the conductor with a distance between plates of the same polarity and electrically connected to each other. Characteristic electrolytic cell.