CN111218699A

CN111218699A - Electrode assembly for electrolytic refining

Info

Publication number: CN111218699A
Application number: CN201910814410.2A
Authority: CN
Inventors: 金相旭; 朴美贞; 金钟晔
Original assignee: Wesco Electrode Co Ltd
Current assignee: Wesco Electrode Co Ltd
Priority date: 2018-11-27
Filing date: 2019-08-30
Publication date: 2020-06-02
Anticipated expiration: 2039-08-30
Also published as: KR102017567B1; CN111218699B

Abstract

The invention provides an electrode assembly for electrolytic refining, which has excellent service life and efficiency. The electrode assembly for electrolytic refining of the present invention comprises a pair of grid plates (6) supported on both sides of a plurality of supporting rods (4). The grid plate is based on Ti, and a catalyst coating layer of 40-45 wt% Ir, 40-45 wt% Sn, 5-10 wt% Pd and 5-10 wt% Ta is formed on the surface of the grid plate. A plurality of auxiliary electrodes (10) may be attached to the outer side of the mesh plate, and the auxiliary electrodes (10) may be formed with the same catalyst coating as the mesh plate. In addition, the auxiliary electrode is formed with a hole (12), and the inner periphery of the hole is deformed in a manner of protruding outward after being cut at a plurality of places, thereby being more advantageous for ensuring the surface area.

Description

Electrode assembly for electrolytic refining

Technical Field

The present invention relates to an electrode assembly for electrolytic refining, and more particularly, to an electrode assembly for electrolytic refining capable of improving the efficiency of electrolytic reaction while reducing power consumption by improving the flow of an electrolytic solution and increasing the surface area through coating of a preferable catalyst substance and structural improvement.

Background

In general, electrolysis is a phenomenon in which ions contained in an electrolyte move to a cathode or an anode by applying a current to the electrolyte. In various production fields, a phenomenon in which metal ions are reduced by such an electrochemical reaction to precipitate metal is utilized. By such an electrolysis step, various metals such as copper, nickel, and zinc can be obtained.

Such electrolysis is usually carried out in an electrolytic cell filled with an electrolytic solution, inside which a plurality of anode plates and cathode plates are arranged. As the first generation electrode, a lead (Pb) electrode is representative, which has the following disadvantages: the anode requires high voltage, short electrode life, contamination and lead precipitation.

Disclosure of Invention

Problems to be solved

The purpose of the present invention is to provide an electrode for electrolytic refining, which can increase the electrolytic efficiency and increase the lifetime by applying a preferred catalyst material.

Another object of the present invention is to maximize electrolysis efficiency by increasing surface area and increasing flow of electrolyte through improvement of structure.

Means for solving the problems

The electrode assembly for electrolytic refining according to the present invention for achieving the above object includes a pair of mesh plates supported on both sides of a plurality of supporting rods, wherein the mesh plates are made of Ti and have a catalyst coating layer formed on the surface thereof, the catalyst coating layer including 40 to 45 wt% of Ir, 40 to 45 wt% of Sn, 5 to 10 wt% of Pd, and 5 to 10 wt% of Ta.

In addition, according to other embodiments of the present invention, an auxiliary electrode attached to a portion of the outer side of the mesh plate and formed with the same catalyst coating layer as the mesh plate may be further included.

In such an embodiment, the auxiliary electrode is formed with a hole, and the inner peripheral edge of the hole is deformed so as to protrude outward after being cut at a plurality of places, so that the fluidity of the fluid and the surface area of the electrode can be ensured.

Effects of the invention

According to the present invention described above, it is possible to sufficiently ensure the fluidity of the fluid in the electrolytic cell and also to sufficiently ensure the surface area when the electrolytic cell is used as an electrode. Further, each composition constituting the catalyst coating layer molded on the Ti base layer can increase the life of the electrode, ensure fluidity, and increase the surface area when used as an electrode, and thus can be expected to have advantages such as reduction in power consumption and increase in zinc recovery rate.

Drawings

Fig. 1 is a front view illustrating an electrode assembly according to the present invention.

3 fig. 3 2 3 is 3 a 3 sectional 3 view 3 of 3 line 3 a 3- 3 a 3 of 3 fig. 3 1 3. 3

Fig. 3 is a sectional view illustrating fig. 1 taken along line B-B.

Description of the symbols

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A grid plate 10

Detailed Description

Next, the present invention is described in more detail. Hereinafter, in the description of the present invention, first, a description is given of an electrode that causes an electrolytic reaction, and an electrode assembly including a support structure for supporting such an electrode is described. The electrode (anode) for electrolytic refining of the present invention is completed as follows: an insoluble catalyst coating layer was formed using Ti (titanium) as a base material and Ir (iridium), Pd (palladium), Ta (tantalum), and Sn (tin) in the following composition ratios.

Here, the composition ratio of the main catalyst material in which Ir is used as an electrode is preferably 40 to 45 wt% in terms of life extension. Further, Sn is used for reducing the anode overvoltage, and the composition ratio thereof is preferably 40 to 45% by weight. Further, Pd is used for improving current efficiency, and the composition ratio thereof is preferably 5 to 10% by weight. Ta, which may be referred to as the last component, may be used as a binder of the above-mentioned composition, and the composition ratio thereof is preferably 5 to 10% by weight.

The composition ratio of each constituent material is a value actually obtained by a large number of trial and error. It is recognized through trial and error that if the amount added is below such a range, the target effect is insufficient and not good, and if the amount added is greater than the above range, a higher improvement effect cannot be expected.

Further, a process of forming a coating layer having the above-described composition ratio on the surface of the electrode is briefly described. The above-mentioned 4 kinds of constituent materials in the powder state are mixed in the above-mentioned composition ratio and then liquefied with a solvent. If a thermal oxidation treatment is performed in which such a liquid substance is applied to the surface of the Ti-based electrode and then the Ti-based electrode is fired in a high-temperature atmosphere, the application of the catalyst substance of the present invention is completed on the surface of the Ti-based electrode. With respect to the anodes having the specific composition ratios thus completed, the performance of the insoluble catalyst anodes was evaluated by the cyclic voltage current method, and the performance of the catalyst coating layer having the specific composition ratio was known. The above-mentioned composition ratios can be said to be actually obtained by repeatedly carrying out such performance evaluations.

Next, an electrode assembly including the support structure of the electrode of the present invention will be described with reference to the embodiments shown in the drawings.

3 fig. 3 1 3 illustrates 3 the 3 front 3 surface 3 of 3 an 3 electrode 3 assembly 3 of 3 the 3 present 3 invention 3, 3 fig. 3 2 3 is 3 a 3 sectional 3 view 3 taken 3 along 3 line 3 a 3- 3 a 3 of 3 fig. 3 1 3, 3 and 3 fig. 3 3 3 is 3 a 3 sectional 3 view 3 taken 3 along 3 line 3 b 3- 3 b 3 of 3 fig. 3 1 3. 3 Referring to such drawings, the electrode assembly of the present invention is constructed in such a manner that a mesh plate 6 having a flat plate shape is supported by a plurality of (6 in the illustrated embodiment) composite rods 4. Also, the composite rods 4 and the bottom of the grid plate 6 are supported by the bottom plate 9.

Here, it can be confirmed from the enlarged view of fig. 2 that the mesh plates 6 are respectively provided at both sides of the composite rod 4. It is expected that by forming a part of the electrode by the mesh plate 6 in this manner, a sufficient fluid flow and stirring effect can be obtained inside the electrolytic cell, and the zinc recovery rate can be improved while suppressing the concentration overvoltage. As shown in fig. 2, the pair of mesh plates 6 provided on both sides of the composite rod 4 can be fixed by, for example, bolts and nuts. Here, as the electrode for electrolytic refining, it is also possible to consider that the mesh plate 6 is partially constituted, but not entirely.

Further, a bus bar 2 is connected to the upper portion of the composite rod 4, and the bus bar 2 supports the grid plate 6, the composite rod 4, and the like, which are installed in the electrolytic cell. Here, even if the composite rod 4, the bus bar 2, and the like are made of a conductive metal (for example, copper) for the purpose of flowing an electric current, the composite rod and the bus bar are integrated via a composite layer applied to each surface. Such a titanium composite layer is also preferable for corrosion resistance against an electrolyte solution having strong acidity.

According to the illustrated embodiment, the pair of mesh plates 6 as described above are provided on both sides of the composite rod 4, whereby the fluidity of the liquid can be ensured. Here, although the fluid fluidity is ensured by the configuration of the mesh plate 6, the mesh structure may be insufficient in terms of the surface area of the reaction as an electrode in practice.

Therefore, in the present invention, as an example for securing a surface area capable of causing an electrolytic reaction when an electrode is formed, it is proposed that a plate-shaped auxiliary electrode 10 is attached to the outer surface of the mesh plate 6. That is, as shown in fig. 1, it is understood that a plurality of plate-like auxiliary electrodes 10 are provided inside and outside a pair of mesh plates provided on both sides of the composite rod 4, respectively.

Such an auxiliary electrode 10 is shaped like a plate having a relatively small area compared to the grid plate 6, and is provided with a plurality of holes. The hole 12 formed in the auxiliary electrode 10 may be considered to ensure the fluidity of the fluid. Further, if the plurality of holes 12 are formed for the auxiliary electrode 10 in a flat plate shape alone, it may be disadvantageous in terms of surface area. Therefore, in the illustrated embodiment, as illustrated in the enlarged view of fig. 3, when the hole 12 is formed, a peripheral portion of the hole 12 is cut at an appropriate interval, and the portion is formed so as to be spread outward (for example, deformed in a shape having a partial conical shape, or deformed so that a plurality of cut portions protrude outward).

In the shape of the auxiliary electrode 10, it is considered that the periphery of the hole 12 is formed in a flower shape (a groove is formed in a stem shape by a slip method). In the present invention, the grid plate 6 and the plate-shaped auxiliary electrode 10 actually induce the electrolytic reaction, and they may of course be supported by the composite rods 4 and the bus bar 2 as described above and disposed inside the electrolytic cell.

In this way, if the peripheral portion (inner peripheral edge) of the hole 12 is cut at a plurality of places (in the radial direction) and deformed (bent) outward (in the outer direction not interfering with the mesh plate), the size of the hole 12 can be enlarged and the loss of the cross-sectional area of the peripheral portion due to simply enlarging the hole 12 can be prevented. That is, the shape around the hole 12 is adopted, which can expand the small hole and increase the surface area of the electrode while ensuring a more secure flow of the fluid.

In the illustrated embodiment, the auxiliary electrodes 10 having the holes 12 as described above are attached to both surfaces of the mesh plate 6 in a band shape having a certain width. Therefore, in the present invention, the basic electrode shape of the mesh plate 6 can sufficiently ensure the fluidity of the fluid, and the selective use of the auxiliary electrode 10 can sufficiently ensure the surface area of the electrode.

It is obvious that a person skilled in the art can make various modifications within the basic technical idea and scope of the invention. Furthermore, the scope of the invention should be construed in accordance with the substance specified by the patent laws and with reference to the scope of the appended claims.

Claims

1. An electrode assembly for electrolytic refining, comprising a pair of mesh plates supported on both sides of a plurality of supporting rods, wherein the mesh plates are based on Ti, and have a catalyst coating layer formed on the surface thereof, the catalyst coating layer containing 40 to 45 wt% of Ir, 40 to 45 wt% of Sn, 5 to 10 wt% of Pd, and 5 to 10 wt% of Ta.

2. The electrode assembly for electrorefining of claim 1, further comprising an auxiliary electrode attached to a part of the outer side of the mesh plate and formed with the same catalyst coating layer as the mesh plate.

3. The electrode assembly for electrorefining according to claim 2, wherein the auxiliary electrode is formed with a hole, and an inner peripheral edge of the hole is deformed so as to protrude outward after being cut at a plurality of places.