JP4282175B2 - Correction method for anode plate for electrolysis - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a correction method for improving the verticality of an anode plate for electrolysis.
[0002]
[Prior art]
For example, in the electrolytic refining of copper, a rough copper plate having a thickness of about 40 to 50 mm is used for the anode plate (anode), and an electric copper thin plate having a thickness of about 0.5 to 1.0 mm is used for the cathode plate (cathode). In the electrolytic cell, a large number of electrode plates are suspended facing each other alternately.
As shown in FIG. 5, the cathode plate is suspended by joining a ribbon 11 to the upper end of the cathode plate 10, passing a crossbar 12 through the ribbon 11, and arranging both ends of the crossbar 12 horizontally and in parallel. This is a method of hanging on the support frame 15 (one end is a bus bar 15A and the other end is an insulating plate 15B during electrolytic operation). On the other hand, the anode plate is suspended as shown in FIG. This is a method of casting into a shape and hanging the ear 2 on the support frame 15.
[0003]
By the way, from the viewpoint of improving current efficiency and effectively using the device space, it is desirable that the electrode plate intervals be equal intervals and as narrow as possible. However, since the cathode plate is thin, it is easy to curl, and since the anode plate is a cast product with ears, the main body is likely to bend due to non-uniform solidification, and the ears are deformed during die cutting. If there is such deformation, the electrode plate spacing becomes uneven, and if the degree of deformation is large, mutual contact will occur and a short circuit will occur, making electrolysis difficult. For this reason, both plates are usually pressed and flattened before being charged into the electrolytic cell.
[0004]
However, in the anode plate, since the ear and the main body are integrated, even if only the main body is flattened, depending on the positional relationship between the ear and the main body, the hanging posture is not vertical. For this reason, as disclosed in, for example, Japanese Utility Model Publication No. 2-10126, the correction device for the anode plate includes a main body pressing device that presses the main body in the plate thickness direction, a hanging direction (vertical direction), and a plate thickness. An ear press device for pressing in each direction (horizontal direction) is provided. These pressing devices press a material set between a fixed receiving mold and a movable pressing mold facing the receiving mold by moving the pressing mold with a cylinder.
[0005]
Thereby, while making a main body flat, an ear shape can be corrected uniformly.
[0006]
[Problems to be solved by the invention]
However, even if the shape of the ear is uniformly corrected using the correction device described above, when the anode plate 1 is suspended by hanging the ear 2 on the support frame 15 as shown in FIG. On the other hand, there are many cases in which the so-called perpendicularity is in a bad state where the tilt is not negligible (the suspension angle θ is greatly deviated from 0 °). If the main body is flat but the verticality is bad, the problem of uneven electrode plates and short circuit cannot be solved.
[0007]
The reason why the verticality deteriorates is that the anode plate is a cast product, so that the center of gravity varies between the plates due to variations in weight and uneven thickness of the main body. Thus, even if the angles and positions of the ears that form the suspension fulcrum are made uniform by pressing, it is considered that the relative relationship between them and the center of gravity is not constant. However, there are no drastic measures, and at present, when an anode plate with poor verticality is found in the stage to be inserted into the electrolytic cell, a shim is inserted between the ear and the support frame by hand. Although the suspension angle is made close to zero, the work requires trial and error, skill, and heavy labor.
[0008]
Therefore, an object of the present invention is to provide a method for correcting an anode plate for electrolysis that can solve the above problems and can easily improve the verticality of the anode plate for electrolysis.
[0009]
[Means for Solving the Problems]
The present invention provides a method for correcting an anode plate for electrolysis in which an anode plate having ears serving as suspension fulcrums is press-corrected in the plate thickness direction and the ears are press-corrected in the suspension direction and plate thickness direction. The verticality was evaluated after press correction by changing either or both of the ear receiving angle in the suspension direction and the ear receiving position in the plate thickness direction, which are the ear press variables that affect the verticality of the anode plate. The method of correcting the anode plate for electrolysis is characterized in that the ear press variable is adjusted based on the result.
[0010]
The verticality is evaluated based on a horizontal distance difference (horizontal distance difference) between an upper end portion and a lower end portion of a suspension plate surface obtained by suspending the plurality of anode plates and measuring them with a distance meter. It is preferable.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The anode plate, which is a cast product, should have a substantially constant thickness and a substantially constant center of gravity. However, the shape of the main body and the shape of the ears change subtly and irregularly due to changes in the mold over time and changes in casting conditions. For this reason, it is difficult to make the mutual relationship between the position and angle of the ear and the center of gravity position of the plate constant by the conventional correction method that uniformly press-corrects the ear shape under the press conditions set at the initial stage. Angular variation increases.
[0012]
On the other hand, in the present invention, for a plurality of anode plates arbitrarily selected at any time, either or both of the ear receiving angle in the suspension direction and the ear receiving position in the plate thickness direction, which are ear press variables that influence the verticality The verticality was evaluated after press correction with different values, and the ear press variable was adjusted based on the results.
As a result, even if the shape of the anode plate changes, the position and angle of the ear can be adjusted to a value suitable for the verticality, so that the variation in the suspension angle can be suppressed to a small level. Work to correct the suspension angle by the side of the tank can be greatly reduced and the productivity of electrolytic copper is improved.
[0013]
FIG. 1 is a schematic side sectional view showing a main part of a correction device suitable for carrying out the present invention. The main body of the anode plate 1 is sandwiched between the receiving die 3B and the pressing die 3A and press-corrected in the plate thickness direction (horizontal direction in FIG. 1) to be flattened. On the other hand, the ear 2 is sandwiched between the receiving mold 4B and the pressing mold 4A and press-corrected in the suspension direction (vertical direction in FIG. 1), and is sandwiched between the receiving mold 5B and the pressing mold 5A in the thickness direction. Press straightened. The pressing dies 3A, 4A, 5A are pushed by the cylinders 3C, 4C, 5C, respectively. The upper end of the ear 2 is tapered because the anode plate 1 is cast into an upper wide mold whose depth direction is the thickness direction at the time of casting, and the tip of the pressing die 4A corresponding thereto is also given the same taper. .
[0014]
The receiving mold 4B is installed so as to be tiltable about a central axis O that can be displaced in the horizontal direction, and the value of the ear receiving angle in the suspension direction (the tilt angle from the horizontal plane of the receiving mold 4B) can be adjusted. is there. Therefore, the angle of the bottom surface of the ear 2 can be changed. In addition, the receiving mold 5B is installed in a variable position in the horizontal direction, and the value of the ear receiving position (the position of the contact surface of the receiving mold 5B) in the plate thickness direction can be adjusted. Therefore, the thickness direction position of the ear 2 can be changed.
[0015]
Whether the ear press variable to be adjusted is the ear receiving angle, the ear receiving position, or both, may be determined appropriately according to the dimensional accuracy of the cast product. The adjustment range of the ear receiving angle may be about ± 5 ° at the maximum, and the adjustment range of the ear receiving position may be about 20 mm at the maximum.
FIG. 2 is a schematic side view showing an example of a method suitable for the verticality evaluation. The press-corrected anode plate 1 is hung with the ear 2 on the horizontal support frame 15A. Two distance meters 6 are placed on the vertical line 9A that is the same horizontal distance away from the vertical line 9 set at the suspended position of the anode plate 1, and the respective measuring directions are horizontally arranged at the upper end and the lower end of the plate surface of the anode plate 2. Arrange to face. In this way, the horizontal distance difference Δx (= | x ₁ −x ₂ |) between the upper end and the lower end is measured by the distance meter 6. If the horizontal distance difference Δx is 0, the suspension tilt angle is 0 °.
[0016]
In the present invention, by changing the value of the ear press variable (Z) for a plurality of samples arbitrarily extracted from the anode plates used in actual operation, the horizontal distance difference Δx is measured to determine the relationship between Z and Δx, Using the relationship, a Z value (Z ₀ ) at which Δx = 0 is obtained and set as a set value, and Z is adjusted so that the Z value matches this set value Z ₀ .
The setting of the ear press variable (determination of the adjustment target value) can be performed, for example, by executing the following steps. Note that the ear receiving position is denoted by Z1, and the ear receiving angle is denoted by Z2.
(A) Initial setting before operation
A1) Fix Z1 to any appropriate value, allocate multiple samples to the same value of Z2, change the value of Z2 and take the data of Δx, and the variation range R (Δx) or standard deviation σ ( Find the value of Z2 where Δx) is the smallest, and fix Z2 to that value. [Z2 initial setting]
A2) Change the value of Z1 to take the data of Δx, find the value of Z1 at which Δx converges to 0, and fix Z1 to that value. [Z1 initial setting]
(B) Re-setting during operation
B1) Fix Z2 to the current value, change the value of Z1, take the data of Δx, find the value of Z1 where Δx converges to 0, and fix Z1 to that value. [Z1 reset]
B2) When Δx converges to a value other than 0 in the step B1, the step A1 → A2 is executed. [Z2 reset → Z1 reset]
The distance meter used in the present invention is preferably a non-contact type such as a laser distance meter or an ultrasonic distance meter, but may be a contact type such as a touch sensor.
[0017]
For example, as shown in FIG. 3, one (or more) distance meters 6 may be arranged to check the linear relationship between the vertical position coordinates y _{i of} each distance meter 6 and the measured value x _i. By doing so, it is possible to detect an abnormal bending of the anode plate 2 that should be flat after press correction, and to detect an abnormality of the correction device at an early stage, which is preferable.
For example, as shown in FIG. 4, a distance meter 6 is also arranged on the opposite side of the anode plate 2 (on the vertical line 9B), and the plate thickness is measured by the relational expression shown in FIG. In this case, it is preferable that a product with an abnormal thickness can be rejected and used as basic data for setting electrolysis conditions.
[0018]
【Example】
The Example which applied this invention to the anode plate press process of a copper electrolytic refining factory is described.
The main body dimensions of the anode plate casting are about 1 m square and the thickness is about 43 to 47 mm. The straightening device shown in FIG. 1 was used. A laser distance meter was used as the distance meter. The adjustment range of the ear receiving angle and the ear receiving position is as described above. In the implementation, 50 anode plates were randomly sampled from the number of processed sheets per day (about 2000) every day, and the results were obtained by changing the ear press variable and taking post-press vertical data. The next day's ear press variable was set based on the above. That is, in this embodiment, “every day” is adopted as “anytime”. As an evaluation factor for verticality, the horizontal distance difference between the upper and lower ends of the suspension plate measured by arranging a distance meter as shown in FIG. 2 was adopted. The relationship between the horizontal distance difference and the ear receiving position and the ear receiving angle is obtained, and the ear receiving position and the ear receiving angle corresponding to zero horizontal distance difference are obtained based on the relationship, and this is set as the set value for the next day. This setting operation is performed according to the steps (A) and (B), and σ (Δx) is adopted as a parameter for determining the value of Z2 at step A1.
[0019]
The adjustment operation targeting the set value is performed by inserting a shim between the receiving mold 5B in FIG. 1 and a receiving mold holding section (not shown) that holds the receiving position for the ear receiving position. 1 was performed by inserting a shim between the receiving mold 4B in FIG. 1 and a receiving mold holding section (not shown) that holds the shim while changing the insertion amount on the left and right sides of the central axis O.
[0020]
As a result, the frequency of correcting the verticality of the anode plate by the side of the electrolytic cell is reduced by about 90% compared to the conventional method, the number of short circuits caused by defective anode plates is reduced, the current efficiency is increased, and the productivity of electrolytic copper is reduced by about 2. The remarkable effect of increasing by% was obtained.
[0021]
【The invention's effect】
Thus, according to the present invention, the verticality of the electrolysis anode plate can be easily improved, the frequency of manual vertical correction by the side of the electrolytic cell can be reduced, and the work load can be reduced. There is an excellent effect of improving the productivity.
[Brief description of the drawings]
FIG. 1 is a schematic side sectional view showing a main part of a correction apparatus suitable for carrying out the present invention.
FIG. 2 is a schematic side view showing an example of a method suitable for verticality evaluation.
FIG. 3 is a schematic side view illustrating an example of an abnormal bending detection method.
FIG. 4 is a schematic side view showing an example of a plate thickness detection method.
FIG. 5 is a front view (a) showing a normal hanging state of the cathode plate and an AA arrow view (b) thereof.
FIG. 6 is a front view (a) showing a regular suspended state of an anode plate and an AA arrow view (b) thereof.
FIG. 7 is a side view showing a suspended state of an anode plate with poor verticality.
[Explanation of symbols]
1 Anode plate (anode)
2 Ears 3A, 4A, 5A Pressing dies 3B, 4B, 5B Receiving dies 3C, 4C, 5C Cylinder 6 Distance meter 9, 9A, 9B Vertical line
10 Cathode plate (cathode)
11 Ribbon
12 Crossbar
15, 15A Support frame θ Suspended tilt angle

Claims (2)

In the method of correcting the anode plate for electrolysis that presses and corrects the anode plate with the ears serving as the suspension fulcrum in the plate thickness direction, and presses the ears in the direction of suspension and plate thickness, the anode plates are arbitrarily selected at any time. On the other hand, after correcting the press by changing the value of either or both of the ear receiving angle in the suspension direction and the ear receiving position in the thickness direction, which are the ear press variables that affect the verticality, the verticality was evaluated. A method of correcting an anode plate for electrolysis, wherein an ear press variable is adjusted based on the basis. 2. The verticality is evaluated based on a horizontal distance difference between an upper end portion and a lower end portion of a suspension plate surface obtained by suspending the plurality of anode plates and measuring them with a distance meter. The method described.

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