JP6750448B2 - Method of manufacturing anode for electrolysis - Google Patents

Description

The present invention relates to a method for producing an anode for electrolysis used in an electrolysis step in a non-ferrous smelting process represented by copper smelting.

Conventionally, in a non-ferrous smelting process for obtaining a valuable metal such as copper or nickel from a non-ferrous metal raw material such as a sulfide concentrate containing a valuable metal such as copper or nickel, in the step of melting and oxidizing the raw material, concentration is performed. Specific gravity is separated into a molten mat containing the target metal and the slag, and the mat is further oxidized in the next step to obtain a molten crude metal. Then, the obtained molten crude metal is cast into the shape of the anode for electrolysis in the next casting step, and electrolytic smelting is performed in the electrolysis step to finish it into a target metal of higher purity.

For example, in copper smelting, which is an example of non-ferrous metal smelting, a molten crude metal obtained by sequentially processing raw materials such as copper concentrate in a smelting furnace, a converter, and a refining furnace to raise the copper grade to about 99% is used. A certain crude copper (hereinafter referred to as "refined crude copper") is cast into an anode for electrolysis, and this is put into the subsequent electrolysis step.

In the electrolysis step, the above anodes and cathodes are alternately charged into the electrolytic cell for electrolytic refining. The copper melted from the anode is electrodeposited on the cathode, and then the cathode after the electrolytic refining is pulled out from the electrolytic cell, washed, bound into a predetermined number of sheets, and stored as a product. Although related to the product shape and the size of the electrolytic cell, the size of the anode and the cathode is generally within a square of about 1000 mm to 1400 mm. In this electrolysis step, electrolytic copper having a purity of about 99.99% can be obtained.

2. Description of the Related Art Conventionally, an electrolysis anode used in an electrolysis step in a copper smelting process has a plurality of anode molds placed on a turntable and is cast, cooled, and stripped while intermittently rotating the turntable.

For example, as shown in FIG. 1, the electrolysis anode casting apparatus 10 sequentially performs casting, cooling, and stripping while intermittently rotating a plurality of anode molds 20 placed on a turntable 11. The anode 30 for electrolysis (see FIG. 2) can be formed by using. The refined crude copper cast while being poured into the anode mold 20 is cooled and solidified. Then, the solidified refined crude copper is stripped from the anode template 20 to form the electrolysis anode 30.

In the process of manufacturing this electrolysis anode, the refined crude copper that has become the electrolysis anode 30 is stripped off, and then the anode mold 20 from the anode mold 20 is cast into the anode mold 20 before the next purified crude copper is cast. In order to improve the releasability of the above, a mold release agent such as clay dissolved in water is sprayed on the inner surface of the mold. Then, after evaporating the moisture of the release agent, the cycle in which the refined crude copper is cast into the anode mold 20 is repeated.

Whether the shape of the electrolysis anode manufactured by such a manufacturing method is good or bad has a great influence on the occurrence frequency of troubles in the electrolysis step which is the next step. For example, the surface of the electrolysis anode 30 is required to be smooth. In the electrolysis process, the distance between the anode and the cathode is set as narrow as possible in order to improve the productivity, but if there is an unnecessary protrusion on the surface of the anode, the distance between the anode and the cathode is set as narrow as possible. If so, the occurrence rate of the short circuit of the anode is increased and the current efficiency of the electrolysis process is significantly deteriorated.

Various means have been devised from the viewpoint of improving the smoothness of the surface of the electrolysis anode. For example, Patent Document 1 discloses a method of casting an electrolytic anode, in which an aqueous solution of a release agent is applied to an anode mold and dried, and then blister copper is poured into the anode mold and the anode after cooling and solidification is taken out from the mold. A method for producing an anode for electrolysis using a mixed aqueous solution containing clay powder and water glass as an aqueous solution of the agent is disclosed. Since the release agent containing clay powder and water glass has enhanced adhesion with the anode mold, the anode mold is formed with a smooth surface, and the smoothness of the surface of the anode for electrolysis can be improved. It is said that.

Further, in Patent Document 2, before spraying a release agent containing water of crystallization on an anode mold, a water-of-crystallization decomposition treatment of holding the release agent at a temperature equal to or higher than the decomposition temperature of water of crystallization is performed. A manufacturing method is disclosed. Since the crystal water in the release agent is decomposed by the crystal water decomposition treatment, swelling on the anode surface is suppressed in the casting step, and the smoothness of the surface of the electrolysis anode is improved. The swelling generated on the surface of the anode is considered to be that the water of crystallization in the mold release agent is heated in the casting step, and the generated steam causes swelling on the surface of the anode.

JP, 10-15659, A JP, 2005-139779, A

However, when clay powder is used as a mold release agent, even when a binder such as water glass is used, or when clay powder subjected to water-of-crystal decomposition treatment is used, It is difficult to evenly spread the mold on the anode mold. Therefore, depending on the position of the anode mold, a difference occurs in the layer thickness of the release layer formed by the release agent, and the release layer is easily peeled off at a portion where the layer thickness is small. The adhesiveness of was not good.

If the adhesion between the anode mold and the mold release agent is poor and the mold release layer is easily peeled off, the heat load of the anode mold becomes high and baking or cracking easily occurs, and the life of the anode mold is shortened. Such a decrease in the life of the anode mold is a major obstacle to application to actual operations in terms of material cost, mold production pace, and increase in time required for mold replacement.

The present invention has been proposed in view of such circumstances, and provides a method for producing an anode for electrolysis, which can improve the adhesion between an anode mold and a release agent and can maintain the life of the mold. The purpose is to

The present inventors have earnestly studied to solve the above-mentioned problems. As a result, in the production of the anode for electrolysis, the particle size of the clay powder used as a release agent to be sprayed on the anode mold, the ratio of the amount of the binder added to the release agent, and the amount of the release agent sprayed on the anode template. It was found that the adhesion between the anode mold and the release agent can be improved and the life of the mold can be maintained by adjusting the above, and the present invention has been completed. Specifically, the present invention provides the following.

(1) A first invention of the present invention is a casting step of casting a molten crude metal into an anode mold, a cooling step of cooling the molten crude metal cast into the anode mold, and a cooling step in the cooling step. A stripping step of stripping the electrolysis anode made of the molten crude metal from the anode mold, and a stripping agent spraying step of spraying a release agent on the anode template after stripping the electrolysis anode. The method for producing an anode for electrolysis having, wherein the release agent contains clay powder having a particle size D ₅₀ of 15 μm or less and a binder, and the amount of the binder added to the release agent. [Binder addition amount (mL)/releasing agent weight (g)] is 0.03 (mL/g) or more and 0.05 (mL/g), and is sprayed per 1 m ^{2 of the} anode mold. The amount of the release agent sprayed [weight of the release agent (g)/spray area of the anode mold (m ² )] is 80 (g/m ² ) or more and 110 (g/m ² ) or less. It is a manufacturing method.

(2) A second invention of the present invention is the method for producing an anode for electrolysis according to the first invention, wherein the binder is water glass.

(3) A third invention of the present invention is the first or second invention, wherein the clay powder is a crystal water-containing clay powder containing crystal water, and the crystal is measured by a differential thermal-thermogravimetric analysis. This is a method for producing an anode for electrolysis, which is obtained by performing a water-of-crystal decomposition process that is maintained at a temperature equal to or higher than the water decomposition temperature.

ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the anode for electrolysis which can improve the adhesiveness of an anode mold and a mold release agent, and can maintain the life of a mold can be provided.

It is a schematic diagram showing typically the composition of the anode casting device for electrolysis used in the manufacturing method of the anode for electrolysis. It is a top view of the anode for electrolysis. It is a perspective view of an anode mold which constitutes the anode casting device for electrolysis.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the following embodiments, and various modifications can be made without departing from the spirit of the present invention.

<<1. Anode casting equipment for electrolysis ≫
The present invention can be implemented in, for example, an electrolysis anode casting apparatus 10 having a configuration as shown in FIG. In the following, as a specific example, a case where the method for producing an electrolytic anode according to the present invention is applied to a part of a copper smelting process will be described.

<1-1. Device configuration>
As shown in FIG. 1, an electrolysis anode casting apparatus 10 capable of carrying out the method for producing an electrolysis anode of the present invention includes a turntable 11, a cooling device 13, a peeling machine 14, a release agent spraying portion 15, and an anode. A mold 20 and the like are provided.

In the electrolysis anode casting apparatus 10, the turntable 11 is installed rotatably intermittently in the direction of the arrow R in FIG. 1, and a plurality of anode molds 20 are placed on the turntable 11. There is. Then, in the anode casting apparatus 10 for electrolysis, the gutter part 12 for pouring refined crude copper as molten crude metal into the anode mold 20 and the purified crude copper cast in the anode mold 20 are further cooled to solidify them. A cooling device 13 for promoting, a stripping machine 14 for stripping the electrolytic anode 30 in which purified crude copper is solidified from the anode mold 20, and a releasing agent for enhancing stripping property in stripping are placed in the anode mold 20. A release agent spraying part 15 for spraying is installed. For simplicity, the number of anode molds 20 is five in FIG. 1, but the number of anode molds 20 is usually about 20.

Then, such an anode casting apparatus for electrolysis 10 intermittently rotates the plurality of anode molds 20 placed on the turntable 11 in the direction of arrow R while performing a casting step, a cooling step, and a stripping step. The removing process and the release agent spraying process are performed.

According to the method for producing an anode for electrolysis of the present invention, in this release agent spraying step, the particle size of the clay powder used as the release agent, the ratio of the amount of the binder added to the release agent, and the release agent for the anode mold 20. By adjusting the amount of the agent sprayed, the adhesion between the anode mold 20 and the release agent can be improved and the life of the mold can be maintained.

<1-2. Anode for electrolysis>
As shown in FIG. 2, an electrolysis anode 30 that can be produced by the method for producing an electrolysis anode according to the present invention includes an anode body that is immersed in an electrolytic solution in a subsequent electrolysis step, and a body for hanging the anode body into an electrolytic cell. It has a pair of hanging ears.

The size and shape of the main body of the electrolysis anode 30 is generally a substantially rectangular shape of about 1000 mm×1000 mm. Since the electrolysis anode 30 has a sufficiently improved surface smoothness, as will be described later, the inter-anode contact caused by the non-uniformity of the surface of the electrolysis anode 30 in the subsequent electrolysis step. It is possible to sufficiently reduce the occurrence rate of short circuit, and it is possible to greatly contribute to the improvement of the productivity of the copper refining process.

<<2. Manufacturing method of anode for electrolysis ≫
<2-1. About each process>
The method for producing an anode for electrolysis of the present invention, in the anode casting apparatus for electrolysis 10, by repeatedly performing a casting step, a cooling step, a stripping step, and a release agent spraying step, which will be described below, It is a manufacturing method of casting the anode 30 for use.

[Casting process]
The casting step is a step of casting the refined crude copper into the anode mold 20 shown in FIGS. 1 and 3. In this step, the refined crude copper is cast into the shape of the electrolytic anode 30 by injecting the refined crude copper into the mold concave portion 21 of the anode mold 20 by a fixed amount through the trough portion 12.

[Cooling process]
The cooling step is a step of cooling the refined crude copper cast in the mold recess 21 of the anode mold 20. In this step, solidification of the refined crude copper in the mold concave portion 21 is promoted by a means of spraying cooling water by the cooling device 13 to the refined crude copper cast in the mold concave portion 21 in the casting step. At the same time, in this step, the temperature of the anode mold 20 is also cooled so as to be reduced to an appropriate temperature.

[Stripping process]
The stripping process is a process of stripping the solidified anode 30 for electrolysis from the mold recess 21 of the anode mold 20 cooled in the cooling process. As a method of peeling off the anode 30 for electrolysis, for example, an ear portion (a drooping ear) that is a part of the anode 30 for electrolysis from the mold recess 21 by a push-up pin or the like (not shown) installed in advance in the mold recess 21. Part) is pushed up, and the pushed up part is hooked by the peeling machine 14 and peeled off.

[Release agent spraying process]
The release agent spraying step is a step of spraying the release agent at a predetermined ratio in the mold recess 21 of the anode mold 20 after the electrolysis anode 30 has been stripped off. After the electrolysis anode 30 is stripped off in the stripping step described above, a mold release agent is sprayed in this mold release agent spraying step in order to perform the next casting step in a preferable mode. Then, the release agent sprinkled on the anode mold 20 is sufficiently evaporated to form a release layer. The anode mold 20 on which the release layer is formed is transferred to a position for casting the refined crude copper and a new refined crude copper is cast in order to perform the casting process of the next cycle.

<2-2. Release agent>
Here, the release agent sprayed on the anode mold 20 in the release agent spraying step is a mixture of clay powder, a binder, and water, and is used as a slurry. Specifically, the present invention is characterized by using a release agent composed of clay powder having a particle size D ₅₀ of 15 μm or less. The clay powder and the binder will be described below.

(1) Composition of release agent (clay powder)
The release agent is mainly composed of clay powder. Specifically, the clay powder contains, as a main component, one or more kinds of minerals such as kaolinite, halloysite, montmorillonite, illite, and vermiculite, although not particularly limited.

Clay powder is characterized by having a particle size D ₅₀ of 15 μm or less. Further, it is preferably 1 μm or more and 10 μm or less, more preferably 4 μm or more and 9 μm or less. The “particle size D ₅₀ ”is a particle size at which the volume cumulative 50% in the particle size distribution curve is obtained, and can be measured by a laser diffraction/scattering particle size distribution measuring method.

When the particle size D _{50 of the} clay powder that constitutes the release agent exceeds 15 μm, the strength of the release layer formed on the anode template 20 decreases, and thus the adhesion between the release agent and the anode template 20 decreases. As a result, the life of the mold is reduced. In particular, as will be described later, when the clay powder used for the release agent is a baked clay powder obtained by baking crystal water-containing clay powder containing crystal water to remove the crystal water, the particle size becomes coarse. Tend to do. Therefore, when using such a baked clay powder, it is preferable to perform a pulverization treatment so that the particle size D ₅₀ is 15 μm or less.

The lower limit of the particle size D ₅₀ of the clay powder is not particularly limited, but is preferably 1 μm or more, more preferably 5 μm or more.

Further, as the clay powder, it is preferable to use a so-called "calcined clay powder", which is a clay powder obtained by performing a calcination treatment at a predetermined temperature to remove water of crystallization. The calcined clay powder can be obtained by a crystal water decomposition treatment in which the calcined clay powder is held and calcined at a temperature equal to or higher than the decomposition temperature of the crystal water contained in the clay powder.

Here, in the clay powder used as the mold release agent, when clay water containing crystal water (clay powder containing crystal water) is used, the surface of the anode 30 for electrolysis has a protrusion like a bowl. It is known that "swelling", which is that is likely to occur. The cause of such "swelling" occurring on the surface of the electrolysis anode 30 is considered as follows. That is, in the production of a general anode for electrolysis, the temperature of the anode mold 20 at the time of spraying the release agent is about 170° C. to 180° C., and the attached water evaporates out of the water contained in the release agent (slurry). However, the water of crystallization contained in the clay powder is not decomposed and remains until the next casting step which is the next step. It is considered that when purified crude copper is poured into the anode template 20 to which the clay powder having the residual crystal water adheres, the residual crystal water is decomposed by the heat of the purified crude copper, and the generated water vapor causes the anode surface to swell. ..

Therefore, by firing the crystal water-containing clay powder by the crystal water decomposition treatment, it is possible to prevent the crystal water from being brought into the casting step and prevent the surface of the anode for electrolysis from swelling.

In the crystal water decomposition treatment, the decomposition temperature of the crystal water means a decomposition temperature obtained by differential thermal-thermogravimetric analysis. The measurement of the decomposition temperature of water of crystallization by the differential thermal-thermogravimetric analysis can be specifically carried out by the measuring method according to JIS K0129. The decomposition temperature of this crystal water is different from the measuring instrument, and there is a difference derived from the measuring method when measured by a method other than differential thermal-thermogravimetric analysis. Even if it is kept at a temperature lower by about 5% than the decomposition temperature of the crystal water measured by, the occurrence of swelling on the anode surface can be suppressed.

In addition, the temperature for holding the release agent during the water-of-crystallization decomposition treatment is preferably not lower than the decomposition temperature of the water of crystallization and not higher than the decomposition temperature of water of crystallization + 300°C. When the holding temperature of the release agent during the water-of-crystallization decomposition treatment is lower than the decomposition temperature of the water of crystallization, the water of crystallization remains in the release agent even after the treatment. In this case, the effect of suppressing swelling in the subsequent manufacturing process cannot be sufficiently obtained. On the other hand, when the holding temperature of the crystal water contained in the release agent is higher than the decomposition temperature of crystal water + 300°C, the crystal water in the release agent is completely decomposed, but the clay powder is burned. It is not preferable because it is bound and it becomes difficult to pulverize into the above-mentioned specific particle size.

In addition, the time for holding the clay powder during the crystallization water decomposition treatment is preferably 10 minutes to 120 minutes. If this holding time is less than 10 minutes, water of crystallization may remain in the release agent even if firing is performed in the above temperature range. On the other hand, if the holding time exceeds 120 minutes, the water of crystallization in the release agent is completely decomposed, but the effect is not further improved and the energy cost is excessive, which is not preferable.

As a concrete method of the water-of-crystallization decomposition treatment, for example, a method of holding the water-of-crystallization clay powder in a predetermined temperature range using an existing heating furnace in the same plant, such as an electric furnace or a kiln, is used. Can be mentioned. However, it is not essential to perform this process in a series of processes or in the same equipment.

(Binder)
The release agent contains a binder together with the above-mentioned clay powder. The binder is a substance that imparts a predetermined viscosity to the release agent (slurry) and contributes to the role of increasing the adhesion between the release agent and the anode mold 20.

The binder is not particularly limited, but water glass is preferably used. By including water glass as a binder in the release agent, the adhesion between the release agent and the anode mold 20 can be further enhanced. Specifically, when a mold release agent containing water glass is applied to the anode mold 20, the water glass is rapidly dried by the anode mold 20 in a high temperature state, and the water glass serves as a binder to firmly adhere to the surface of the anode mold 20. A release layer (layer of clay powder) is formed to improve the adhesion between the release agent and the anode mold 20.

The water glass is a concentrated aqueous solution of silicon dioxide-alkali glass in which silicon dioxide and alkali having the following composition are melted (water content of 10% by mass or more and 30% by mass or less), and a colorless or slightly colored viscosity. It is a large liquid and becomes a glass when left in the air.
M ₂ O・nSiO ₂・mH ₂ 0
(However, M is an alkali metal selected from Na, K and the like, and n is 0.5 to 4.)

Here, the ratio of the amount of the binder added to the release agent [binder addition amount (mL)/release agent weight (g)] is 0.03 (mL/g) or more and 0.05 (mL /G). As a result, it is possible to secure the minimum layer thickness of the release layer necessary for maintaining the life of the anode mold 20, and to secure the cooling amount of the electrolysis anode 30 required before the stripping step.

When the ratio represented by [amount of binder added (mL)/weight of release agent (g)] is less than 0.03 (mL/g), the release layer formed on the anode mold 20 becomes thin. In addition, the adhesion between the anode mold 20 and the release layer is lowered, and the life of the anode mold is shortened. On the other hand, if it exceeds 0.05 (mL/g), the release layer formed on the anode mold 20 is likely to be thick, and the heat transfer resistance is increased, so that cooling of the electrolytic anode is likely to be insufficient in the cooling step described later. .. As a result, in the conventional cooling time, the electrolytic anode is bent during the stripping process, and the defective product is likely to be defective.

(2) Amount of Release Agent Sprayed In the present invention, the amount of the release agent applied in the release agent application step is the amount of the release agent applied per 1 m ² of the anode mold [release agent weight ( g)/spray area of anode mold (m ² )] is 80 (g/m ² ) or more and 110 (g/m ² ) or less. By setting the spray amount of the release agent within such a range, it is possible to secure the minimum layer thickness of the release layer necessary for maintaining the life of the anode mold 20, and at the same time for the electrolysis required by the stripping step. The cooling amount of the anode 30 can be secured.

If the amount of the release agent applied [weight of the release agent (g)/area of application of the anode mold (m ² )] is less than 80 (g/m ² ), the release layer formed on the anode mold 20 is thin. Is likely to occur, the adhesion between the anode mold 20 and the release layer is lowered, and the life of the anode mold is shortened. On the other hand, when the amount of the release agent sprayed exceeds 110 (g/m ² ), the release layer formed on the anode mold 20 is likely to be thick and the heat transfer resistance increases, so that the electrolytic anode of the electrolytic anode is cooled in the cooling step described later. Cooling tends to be insufficient. As a result, with the conventional cooling time, the electrolytic anode is likely to bend during the stripping process and become defective.

Further, in the release agent spraying step, it is preferable to secure a drying time from spraying the slurry of the release agent on the mold recess 21 to pouring purified crude copper into the mold recess 21 in the next cycle. Specifically, the drying time is preferably about 60 seconds to 160 seconds. Since the temperature of the anode mold 20 in this process step is about 170° C. to 180° C., it takes about 60 seconds to 160 seconds to dry the water contained in the slurry of the release agent sprayed in the mold recess 21. It takes time. If the drying time is shorter than 60 seconds, water may remain in the sprayed release agent. On the other hand, if the drying time exceeds 160 seconds, the production amount of the electrolysis anode 30 will decrease. It may happen.

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

[Example 1]
(Preparation of baked clay powder)
The decomposition temperature of the crystallization water contained in the crystallization water-containing clay powder prepared as a release agent was 900° C. as measured by differential thermal-thermogravimetric analysis according to JIS KO129. Therefore, this crystallization water-containing clay powder was kept at 900° C. for 10 minutes to be subjected to crystallization water decomposition treatment to obtain a baked clay powder. The amount of crystal water decomposed was 9% by mass with respect to the mass of the crystal water-containing clay powder. When the particle size D ₅₀ of this calcined clay powder was measured, the particle size D _{50 was} 15.6 μm, and the particle size was coarser than that of the pre-treatment water-containing clay powder.

Next, the calcined clay powder was pulverized with a ball mill to a particle size D ₅₀ =8.6 μm. The particle size D ₅₀ was measured by a laser diffraction/scattering particle size distribution measuring device (manufactured by Macrotrack, model number 9320-X100).

(Preparation of release agent)
A fired clay powder having a particle size D ₅₀ =8.6 μm obtained by pulverization and water glass as a binder were added to industrial water and stirred to prepare a release agent having the conditions shown in Table 1. As the water glass, sodium silicate specified in JIS K1408, No. 3 was used.

(Preparation of anode for electrolysis)
The release agent obtained as described above is uniformly sprayed on the anode mold and dried for 90 seconds, and after a release agent spraying step of forming a release agent layer, the above-mentioned casting step, cooling step, An anode for electrolysis was produced through a stripping process. The number of electrolysis anodes manufactured per day was 80 per one anode mold.

[Comparative Example 1]
Anode casting for electrolysis was performed in the same manner as in Example 1 except that calcined clay powder was used without being crushed, that is, clay powder having a particle size D ₅₀ =15.6 μm was used as the clay powder used as the release agent. I went.

[Comparative Examples 2 to 5]
Anode casting for electrolysis was performed in the same manner as in Example 1 except that the addition amount of water glass and the coating amount of the release agent in the release agent were changed to the conditions shown in Table 1.

[Evaluation]
The period up to that point was measured assuming that the time when the seizure occurred on the anode mold reached the "life of the anode mold". Moreover, the swelling on the surface of the manufactured anode electrode for electrolysis was measured. The swelling height of the electrolysis anode electrode is the average value of the highest swelling heights of the 10 electrolysis anodes selected arbitrarily.

As can be seen from Table 1, the anode mold of Example 1 could secure a life of 1 month or more. Moreover, since the anode mold of Example 1 was excellent in the adhesiveness of the release agent, it was possible to prevent the anode mold from being formed on a smooth surface and bulging on the surface.

On the other hand, in the anode mold of Comparative Example 1 in which the particle size of the clay powder was too large, the strength of the release layer was weak, the adhesion between the release layer and the anode mold was weak, and the life was shortened. Also, in the anode molds of Comparative Example 2 in which the amount of the release agent applied was too small, and Comparative Example 3 in which the amount of the binder was too small, the release layer formed on the anode mold was thin and The adhesion between the layer and the anode mold was weak and the life of the anode mold was shortened. On the other hand, in the anode molds of Comparative Example 4 in which the amount of the release agent applied was excessively large and Comparative Example 5 in which the amount of the binder was excessively large, the release layer was thick and the heat transfer resistance was increased, thereby increasing the electrolytic anode. The cooling was likely to be insufficient, and the electrolytic anode bent during the stripping process, resulting in a defective product.

10 Anode Casting Equipment 11 Turntable 12 Gutter 13 Cooling Device 14 Stripping Machine 15 Release Agent Spraying Part 20 Anode Casting Mold 21 Mold Recess 30 Anode for Electrolysis

Claims (3)

A casting step of casting molten crude metal into the anode mold,
A cooling step of cooling the molten crude metal cast into the anode mold;
From the anode mold cooled in the cooling step, a stripping step of stripping the electrolytic anode made of the molten crude metal,
After the stripping of the electrolysis anode, a release agent spraying step of spraying a release agent on the anode mold, and a method for producing an electrolysis anode comprising:
The release agent contains a clay powder having a particle size D ₅₀ of 15 μm or less and a binder,
The ratio of the amount of the binder added to the release agent [binder addition amount (mL)/release agent weight (g)] is 0.03 (mL/g) or more and 0.05 (mL/g) And
The amount of the release agent applied per 1 m ^{2 of the} anode mold [release agent weight (g)/anode mold application area (m ² )] is 80 (g/m ² ) or more and 110 (g/m ^{2 ).} ) Is less than
Manufacturing method of anode for electrolysis. The method for producing an anode for electrolysis according to claim 1, wherein the binder is water glass. The clay powder is obtained by subjecting the water-containing clay powder containing water of crystallization to a water-of-crystal decomposition treatment in which the water of crystallization is held at a temperature equal to or higher than the decomposition temperature of the water of crystallization measured by differential thermal-thermogravimetric analysis.
The method for producing the electrolysis anode according to claim 1.

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