JP2009072823A - Casting mold of anode for electrolyzing copper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a casting mold of anode for electrolyzing copper, which has an excellent profile and enables stabilization of casting and electrolyzing processes, in the casting stage of the anode for electrolyzing copper in the copper refining operation. <P>SOLUTION: The casting mold of anode for electrolyzing copper is equipped with a plurality of linear projections (12) to prevent occurrence of deformation of a mold (5) on the casting surface (11), and a flat surface area (13) of 60 to 80 mm in width without the linear projection (12) on the outer periphery of the casting surface (11). <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a shape of an anode mold for copper electrolysis for casting an anode having a good shape capable of stabilizing the casting process and the electrolysis process in an anode casting process for copper electrolysis in a copper smelting operation.

The anode of about 98% of copper grade cast in the anode casting process for copper electrolysis in the copper smelting operation is finished into electrolytic copper of about 99.99% copper grade in the electrolytic process of the next step, and is made into a product. It is known that the shape of the anode produced in the casting process has a great influence on the stability of the operation in the electrolysis process.

The shape of the anode required to stably operate the electrolysis process is that the thickness is uniform, the surface is smooth, the outer edge of the anode is not cast or bulged, etc. For the reason shown in

1 and 2 are schematic views showing an anode and a cathode charged in an electrolytic cell. As shown in FIG. 1, in the electrolysis process, the substantially rectangular anode 1 and cathode 2 are alternately charged into an electrolytic cell (not shown), and electrolytic smelting is performed. The copper that has melted from the anode 1 is electrodeposited on the cathode 2, and then the cathode 2 that has been subjected to electrolytic smelting is lifted from the electrolytic cell, washed, bound to a predetermined number, and stored as a product. The size of the anode 1 and the cathode 2 is generally a size that fits in a square of about 1000 mm to 1400 mm, although it is related to the product shape and the electrolytic cell size.

The ideal positional relationship between the anode 1 and the cathode 2 during electrolytic smelting is that the anode 1 and the cathode 2 referred to as the interelectrode distance 3 in a state of being suspended vertically in the electrolytic cell as shown in FIG. Is adjusted equally in any part of the anode 1 and cathode 2 facing each other. This is because if the anode 1 and the cathode 2 maintain the above-described ideal positional relationship, the local electric resistance can be prevented from being lowered or short-circuited, so that the electrolysis process can be stably operated. .

Therefore, in order to make the inter-electrode distance 3 equal, as described above, the anode 1 is uniform in thickness, the surface thereof is smooth, and the outer edge portion of the anode 1 is cast into a shape without casting or swelling. There is a need.

FIG. 3 is a schematic view showing an anode casting facility. The anode casting equipment used in the anode casting process is that a plurality of copper molds 5 are placed on a turntable 4 which is a mold conveying equipment, and the mold 5 is rotated while rotating the turntable 4 in a predetermined rotation direction 6. Conveyed continuously, the molten copper is cast into the mold 5 from the rod 7, the molten copper is solidified by the cooling device 8 to cast the anode 1, and then the anode 1 is stripped by the stripper 9. .

After the anode 1 is peeled from the mold 5, the mold 5 is cleaned to remove casting residues such as powdered and flaky slabs, copper oxide, and clay. After applying clay water as a mold release agent and sufficiently evaporating the water, it returns to the jar 7 to cast new molten copper. For simplification, the number of molds is 6 in FIG. 3, but the number of molds is usually about 18.

Among the required anode shapes listed above, the smooth surface and the absence of casting or swelling at the outer edge of the anode are not suitable even after the anode casting process, even if an anode with an unfavorable shape is cast. The shape can be corrected by relatively light grinding or the like. In addition, for example, Patent Document 1 discloses a method of suppressing the occurrence of casting by providing a stainless steel plate at the top of the anode mold. Is published. Further, for example, Patent Document 2 discloses a method for suppressing the occurrence of blistering by measuring the anode surface temperature distribution, and Patent Document 3 refers to waist folding by sufficiently cooling the anode. A method for suppressing the occurrence of bending of the anode is disclosed.

On the other hand, when attention is paid to the fact that the thickness is uniform among the required shapes of the anode, the distortion of the mold due to heat is known as one of the obstructions.

That is, in the anode casting process, the anode mold is distorted by heat each time it is used, and if the distortion appears on the casting surface, it becomes difficult to produce an anode having a uniform thickness.

In order to prevent the occurrence of this distortion, for example, Patent Document 4 discloses a technique for suppressing the progress speed of the distortion by providing streak-like convex portions in a grid pattern on the casting surface of the anode mold.

FIG. 4 is a schematic perspective view of a conventional copper electrolysis anode mold in which grid-like streaks 12 are provided on the casting surface 11, and FIG. 5 shows the shape of the casting surface of the conventional copper electrolysis anode mold. FIG. By providing the grid-like streaks 12 on the casting surface 11 in this way, the distortion of the anode mold can be greatly reduced. However, according to this technique, the grid-like streaks on the casting surface 11 of the anode mold. Therefore, it is difficult to clean the casting residue deposited on the relatively concave portions, particularly the outer edge portion and lower corner portion of the substantially rectangular casting surface 11, and the casting residue remains in the anode mold. was there.

For this reason, when clay water, which is a mold release agent, is applied to the casting surface, moisture permeates into the casting residue at the outer edge and corners, which remains without being completely dried. It often evaporates and boils, resulting in blistering and casting at the outer edge and corners of the anode.

In order to prevent such troubles, it is necessary to sufficiently remove the casting residue, but this removal work requires about 20 minutes of work per mold, which is the rate-controlling speed of the turntable. The work efficiency was poor and the cost was disadvantageous. For this reason, a copper electrolysis anode mold having a shape capable of shortening the cleaning work time for removing the casting residue has been demanded.
Japanese Utility Model Publication No. 05-5262 JP 09-164468 A JP-A-06-79438 Japanese Patent Laid-Open No. 2003-211264

The present invention has been made to solve such a situation, such as anode outer edge, corner bulge, casting, etc. in an anode mold for copper electrolysis having a streaky convex portion for preventing distortion of the mold. It is an object of the present invention to provide an anode mold for copper electrolysis that can easily remove the casting residue that causes the problem.

In order to solve the above-mentioned problems, the present inventors have found that the casting residue can be easily removed by flattening a part of the casting surface of the anode mold, and the present invention has been completed. That is, according to the present invention, there is provided an anode mold for copper electrolysis that has a streak-like convex portion for preventing distortion of the mold and can easily remove a casting residue.

Specifically, in the anode mold for copper electrolysis in which the casting surface (11) is provided with a plurality of distortion-shaped convex portions (12) for preventing distortion of the mold (5), the outer surface of the casting surface (11) has a streak shape. A flat part (13) having a width of 60 to 80 mm without a convex part (12) was provided.

In the anode mold for copper electrolysis, a 110-130 mm square flat portion (14) having no streak-like convex portion (12) at the lower corner portion of the casting surface (11) corresponding to the lower end corner portion of the anode (1). ).

When the anode mold for copper electrolysis of the present invention is used, the removal of casting residue is facilitated, so that the cleaning work time is shortened, and an anode having a good outer edge and corner shape can be cast at low cost. Moreover, distortion of the casting surface due to heat can be prevented by the stripe-shaped convex portions for preventing distortion of the mold. Thereby, since the stabilization of the electrolysis process which is a next process can be aimed at, the industrial value is very large.

That is, in the anode mold for copper electrolysis in which the casting surface (11) is provided with a plurality of streaky convex portions (12) for preventing distortion of the mold (5), streaky convex portions ( Since the flat portion (13) having a width of 60 to 80 mm without 12) is provided, the casting residue does not enter and accumulate in the concave portions between the streaky convex portions (12), and the cleaning of the casting residue is facilitated. As a result, all of the casting residue can be removed, so that the water of the mold release clay water permeates into the casting residue, so that the moisture does not completely evaporate, and the moisture suddenly evaporates during casting, It is possible to prevent a trouble that causes boiling and casting at the outer edge and corner of the anode.

Moreover, since the 110-130 mm square flat part (14) without a streak-like convex part (12) was provided in the lower corner part of the casting surface (11) corresponding to the lower end corner part of the anode (1), The casting residue does not enter and accumulate in the recesses between the portions 12, and cleaning of the casting residue is facilitated particularly in the lower corner portion of the casting surface (11) where cleaning is difficult to enter and is difficult to clean. As a result, the moisture of the release clay water soaks into the casting residue and the moisture does not completely evaporate, and the moisture suddenly evaporates during casting, boils up, Troubles that cause swelling and casting at the corners can be prevented. Further, since the flat portion has no irregularities due to the streaky convex portion (12) and is easy to clean, the casting residue collected from the entire casting surface (11) is collected in this portion and removed without leaving the casting residue. You can also.

The present invention relates to an anode mold for copper electrolysis having a streaky convex portion for preventing distortion of a mold, and the outer edge portion and the lower corner portion of the casting surface (at the lower end corner portion of the anode), which has conventionally been difficult to clean the casting residue. The shape of the equivalent) is made flat, so that the cleaning time for the casting residue is shortened and the anode can be manufactured efficiently. Thereby, since the occurrence of swelling and casting of the anode in the outer edge portion and the lower corner portion due to casting residue can be suppressed, stable operation can be realized even in the subsequent electrolysis step.

Hereinafter, the anode mold for copper electrolysis of the present invention will be described in detail. FIG. 6 is a schematic perspective view of the anode mold for copper electrolysis of the present invention, and FIG. 7 is a schematic plan view showing the shape of the casting surface of the anode mold for copper electrolysis of the present invention.

In FIG. 6, the mold 5 is a copper casting, and includes a smooth casting surface 11 so as to form a smooth surface on a substantially rectangular copper electrolysis anode. On the casting surface 11, stripe-like convex portions 12 having a height of 3 to 10 mm for preventing thermal distortion of the mold 5 are formed in a lattice shape. A hole 15 through which a push-up rod (not shown) for peeling the cast copper electrolysis anode from the mold 5 passes is formed in the approximate center of the casting surface 11. This hole 15 is closed by clay or the like during casting.

As shown in FIG. 7, in the anode mold for copper electrolysis of the present invention, a part of the streak-like convex portion 12 that has been present on the entire casting surface 11 is removed. That is, a flat portion 13 having a width of 60 to 80 mm is provided at the outer edge portion of the casting surface 11 of the mold 5. Further, a flat portion 14 of 110 to 130 mm square is provided in the lower corner portion of the casting surface 11 corresponding to the lower end corner portion of the anode 1.

If the flat portion 13 of the casting surface 11 is narrower than 60 mm, the efficiency of the cleaning operation is poor. If the width is larger than 80 mm, the anode mold 5 is likely to be distorted. Therefore, the flat portion 13 is 60 to 80 mm. Is preferred. Further, if the flat portion 14 of the lower corner portion of the casting surface 11 is narrower than 110 mm square, the efficiency of the cleaning work is poor, and if it is wider than 130 mm square, distortion of the anode mold is likely to occur. The flat portion 14 is preferably 110 to 130 mm square.

Table 1 is a table showing working time and the like when actually operating with the anode mold for copper electrolysis of the present invention.

From Table 1, it can be seen that the cleaning time is shortened from about 20 minutes to ¼, the anode shape is good, and the frequency of mold distortion is the same as the conventional one. That is, according to the present invention, the cleaning operation time can be shortened without diminishing the effect of the streaky convex portion 12 for preventing thermal distortion.

The anode mold for copper electrolysis of the present invention relates to the casting surface shape of the mold, and can be suitably applied to the production of an anode for electrolytic purification using a mold in the same manner as copper smelting. it can.

It is a schematic diagram which shows the anode and cathode with which the electrolytic vessel was charged. It is a schematic diagram which shows the anode and cathode with which the electrolytic vessel was charged. It is the schematic which shows an anode casting installation. It is a schematic perspective view of the conventional anode mold for copper electrolysis. It is a schematic top view which shows the shape of the casting surface of the conventional anode mold for copper electrolysis. It is a schematic perspective view of the anode mold for copper electrolysis of the present invention. It is a schematic plan view which shows the shape of the casting surface of the anode mold for copper electrolysis of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Anode 2 Cathode 3 Electrode distance 4 Turntable 5 Mold 6 Rotating direction 7 樋 8 Cooling device 9 Stripper 10 Release agent coating device 11 Casting surface 12 Streaky convex portion 13 (outer edge portion) flat portion 14 (lower portion) Flat part 15 hole in the corner

Claims (2)

In the anode mold for copper electrolysis in which a plurality of streaky convex portions (12) for preventing distortion of the mold (5) are provided on the casting surface (11), the streaky convex portions (12) are formed on the outer edge portion of the casting surface (11). An anode mold for copper electrolysis, characterized in that a flat portion (13) having a width of 60 to 80 mm without any metal is provided. A flat portion (14) of 110 to 130 mm square having no streak-like convex portion (12) is provided at a lower corner portion of the casting surface (11) corresponding to the lower end corner portion of the anode (1). Item 2. An anode mold for copper electrolysis according to Item 1.

Images