JPH0565684A - Method for grinding cathode base plate for electrowinning metal and device therefor - Google Patents

Abstract

PURPOSE:To efficiently grind a cathode base plate and to improve the efficiency in stripping off the desired metal by inserting regularly spaced plural cathode base plates between the couples of roll brushes and vertically moving the base plates. CONSTITUTION:Every other one of the regularly spaced plural cathode base plates 2 with a desired metal deposited thereon in an electrolytic cell is drawn out so that the electrical connection is maintained. All the plates 2 are carried to a grinder. Every other one of the plates 2 is inserted between the roll brushes 4a and 4b of the plural couples 4 of the roll brushes. The brushes 4a and 4b are then rotated, and the plate 2 is vertically moved with respect to the brush. The plates 2 are simultaneously ground in this way, and the deposited metal is stripped off. All the plates 2 are then raised and separated from the grinder, the adjacent plates 2 are horizontally moved a distance L2 between the plates, and the remaining plates 2 are inserted between the brushes 4a and 4b and ground in the same way as before.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for polishing a cathode mother plate used for electrolytically extracting metals such as zinc and cadmium in hydrometallurgy.

[0002]

2. Description of the Related Art Electrolytic extraction of metals such as zinc is carried out by electrodepositing a target metal on a cathode mother plate in an electrolytic cell, and the target metal electrodeposited on the cathode mother plate is periodically removed from the cathode mother plate. Are peeled off and collected. The removal and recovery of the target metal is carried out by manually or mechanically pulling out the cathode mother plate from the electrolytic cell and then taking out the extracted cathode mother plate. The cathode mother plate from which the target metal has been peeled off is returned to the electrolytic cell.

By the way, if the surface of the cathode mother plate is rough or scratched, the releasability at the time of the next peeling will deteriorate. Therefore, after the target metal is peeled off, it is polished before returning to the electrolytic cell. There is a need. In the electrowinning of zinc, a pure aluminum plate is used as the cathode base plate, so the surface of the cathode base plate is affected by impurities such as fluorine and chlorine that are slightly contained in the electrolytic solution during electrolysis. This polishing is particularly necessary because it is liable to be roughened and easily scratched by a peeling tool during peeling.

The polishing of the cathode mother plate is carried out by inserting the cathode mother plate between a pair of parallel roll brushes rotating in opposite directions.
This is done by sliding these roll brushes on the front and back surfaces of this cathode mother plate. Conventionally, polishing of this cathode mother plate has been performed for every one or two cathode mother plates.
This is because the target metal was peeled off for every one or two cathode mother plates before polishing the cathode mother plates.

However, since the work efficiency is very poor if the target metal is peeled off for each one or two cathode mother plates, recently, in order to improve the efficiency of the peeling operation and save labor, a plurality of cathodes are used. At the same time, the target metal has been peeled off from the mother board.

For example, when the total number of cathode mother plates in one electrolytic cell is 36, half of them, 18 cathode mother plates, are extracted from the electrolytic cell by using a hoist and a hanging tool, and these cathode mother plates are extracted. The target metal has come to be peeled off from the plate at the same time. Here, the reason why half of the cathode mother plates are extracted is that if all the cathode mother plates are extracted at once, the energized state of the electrolytic cell cannot be maintained.

[0007]

However, even if the target metal is peeled off simultaneously from a plurality of cathode mother plates, the front and back surfaces of each one or two cathode mother plates are polished. Then, there is a problem that the polishing of the cathode mother plate becomes a rate-determining step and the efficiency of the entire peeling operation cannot be improved.

The present invention improves the efficiency of the polishing operation of the cathode mother plate for electrowinning of metal, and improves the efficiency of the entire peeling operation from peeling the target metal from the cathode mother plate and returning it to the electrolytic cell. An object of the present invention is to provide a method for polishing a cathode mother plate for electrowinning a metal and an apparatus therefor.

[0009]

[Means for Solving the Problems] In order to solve the above problems,
As a result of various trial and error, the inventors of the present invention have taken a plurality of pairs of roll brushes that have been removed every other sheet from the electrolytic bath for electrolytic extraction of metal with a polishing device provided with a plurality of roll brush pairs in a comb shape. This cathode mother plate inserted into the roll brush of each roll brush pair by inserting the cathode cathode plate of the plurality of every other between the roll brushes of each roll brush pair by inserting the whole cathode mother plate Are simultaneously polished by this polishing device, and then the entire cathode mother plate is separated from this polishing device, and the entire cathode mother plate or polishing device is moved horizontally by the distance between adjacent cathode mother plates, and this polishing is performed. Insert the entire cathode mother plate into the device and insert the remaining cathode mother plate between the roll brushes of each roll brush pair, and simultaneously remove the remaining cathode mother plate inserted between the roll brushes of each roll brush pair by the polishing device. Polish DOO reached the polishing method of electrowinning cathode mother plate metal characterized by.

Here, the reason why polishing is performed in a state where the space between the plurality of cathode mother plates is taken out from the electrolytic cell is as follows.
This is because it is convenient to return the cathode mother plate to the electrolytic cell after polishing.

As an apparatus for carrying out this polishing method, polishing is performed by simultaneously polishing every other plurality of cathode mother plates taken out from the metal electrolytic bath for electrowinning while keeping the intervals. An apparatus, an elevating device for moving the entire cathode mother plate or the polishing device up and down, and a moving device for moving the entire cathode mother plate or the polishing device in the horizontal direction, the polishing device, the cathode mother plate At least half the number of roll brush pairs, and a rotating device for rotating each roll brush of the roll brush pair, the roll brush pair is arranged at a predetermined interval horizontally and in parallel with the cathode mother plate. Of the pair of roll brushes, the distance between the center and the center of the adjacent pair of roll brushes is the same as the distance between the cathode cathode plates every other sheet. It has reached the polishing apparatus take-up cathode mother plate.

[0012]

In the present invention, since the plurality of cathode mother plates taken out from the electrolytic cell for electrolytic extraction of metal are simultaneously polished by the pair of roll brushes of the polishing apparatus, the efficiency of the polishing operation of the cathode mother plate is improved. Is improved.

[0013]

First, a polishing apparatus according to an embodiment of the present invention will be described. FIG. 1 is a perspective view showing a part of a polishing apparatus according to an embodiment of the present invention. This polishing apparatus includes a plurality of pairs of roll brushes 4 for simultaneously polishing every other one of a plurality of cathode mother plates 2 taken out from the metal electrolytic bath for electrolytic collection while keeping the space between them, and a pair of roll brushes 4. A hoist and a suspending device (not shown) as an elevating device for elevating and lowering the entire mother plate 2 and a moving device (not shown) for horizontally moving the entire cathode mother plate 2 are provided.

The roll brush pair 4 is a pair of roll brushes 4.
a, 4b, and a rotating device (not shown) for rotating the roll brushes 4a, 4b as shown by arrows A, B is connected to each of the roll brushes 4a, 4b. There is. The roll brush pair 4 is arranged horizontally at a predetermined interval and in parallel with the cathode mother plate 2, and the interval L ₁ between the center portions of the roll brush pairs 4 adjacent to each other in the roll brush pair 4 is equal to one another. It is the same as the interval L ₂ between every other cathode mother plates 2.

Next, a case of polishing a cathode mother plate using this polishing apparatus, that is, a polishing method according to an embodiment of the present invention will be described. First, as shown in FIG. 2, a plurality of cathode brush plates were taken out from a pair of comb-shaped roll brushes 4 every other sheet from the electrolytic cell for electrolytic extraction of metal while keeping the intervals. The whole 2 is lowered and every other one of the plurality of cathode mother plates 2 is inserted between the roll brushes 4a and 4b of each roll brush pair 4.

Next, as shown in FIG. 3, while the distance between the roll brushes 4a and 4b of each roll brush pair 4 is narrowed and the cathode mother plate 2 is lowered, every other cathode mother plate 2 is rolled. The roll brushes 4a and 4b of the brush pair 4 simultaneously polish. Then, after each roll brush pair 4 reaches the upper portion of the cathode mother plate 2 as shown in FIG. 4, the cathode mother plate 2 is turned upward.

Next, after the polishing of half the number of cathode mother plates 2 is completed, the entire cathode mother plate 2 is lifted to separate the entire cathode mother plate 2 from each roll brush pair 4, and FIG. As shown in, the entire cathode mother plate 2 is moved horizontally by the distance between the cathode mother plates 2 adjacent to each other.

Then, the whole cathode mother plate 2 is again inserted into each roll brush pair 4, the remaining cathode mother plate 2 is inserted between the roll brushes 4a and 4b of each roll brush pair 4, and each roll brush pair is inserted. The remaining cathode mother plate 2 inserted between the four roll brushes 4a and 4b is simultaneously polished by the roll brushes 4a and 4b.

The reason why the plurality of cathode mother plates are polished twice in the above method is as follows. That is, in the zinc electrolysis operation of the present inventors, an aluminum plate having a size of about 0.8 m × 1.2 m × 7 mm is used as a cathode mother plate, and it is available at a low cost for polishing this cathode mother plate. The diameter of the roll brush can be 100m
It is about mφ. However, the distance between adjacent cores of the cathode mother plates in the electrolytic cell for this electrolytic operation is 80 mm,
The distance between every other sheet is 160 mm. Therefore, if an attempt is made to arrange a roll brush pair consisting of 100 mmφ roll brushes for each of the 18 cathode mother plates with a core / core spacing of 160 mm, it is impossible to arrange the roll brush pairs on the same line. Therefore, it is impossible to polish all the cathode mother plates at the same time.

Next, according to the conventional method and the method of the present invention, the cathode mother plate was extracted from the electrolytic cell and the target metal was peeled off by the actual operation of zinc electrowinning under the following conditions. When the working time until polishing and returning to the electrolytic cell was obtained, it was as shown in Table 1.

Conventional method: Number of batchwise withdrawn from electrolytic cell: 18 sheets: Number of cathode mother plates to be peeled off: 2 at a time: Number of cathode mother plates to be polished: 2 at a time The present invention method: Batch withdrawal from an electrolytic cell Number of printed sheets: 18 ・ Number of cathode mother plates to be peeled off: 18 at a time ・ Number of cathode mother plates to be polished: 9 + 9 at a time

[0022]

[Table 1]

As is clear from the results shown in Table 1, according to the present invention, the working time of the entire peeling operation can be shortened by about 30% as compared with the conventional method.

In this comparative experiment, a 0.8 m × 1.2 m × 7 mm aluminum plate was used as the cathode mother plate, a 100 mmφ roll brush was used, and 36 cathodes were used in the electrolytic cell. The mother plate was put in, and the core-core interval of the cathode mother plate was 80 mm. The working time in Table 1 is a value per 1008 cathode cathode plates.

[0025]

EFFECTS OF THE INVENTION According to the present invention, since the efficiency of the polishing work of the cathode mother plate for electrowinning of metal is improved, the peeling operation for peeling the target metal from the electrodeposited cathode mother plate and returning it to the electrolytic cell. This has the effect of improving the overall efficiency.

[Brief description of drawings]

FIG. 1 is a perspective view showing a part of a polishing apparatus according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a state immediately before a cathode mother plate is inserted into a roll brush.

FIG. 3 is an explanatory view showing a state where a cathode mother plate is polished by a roll brush.

FIG. 4 is an explanatory diagram showing a state in which a roll brush has reached an upper portion of a cathode mother plate.

FIG. 5 is an explanatory diagram showing a state in which polishing of half the number of cathode mother plates is completed and the entire cathode mother plate is moved in the horizontal direction.

[Explanation of symbols]

 2 cathode mother board 4 roll brush pair 4a, 4b roll brush

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masahiro Motojima 1443 Nakajuku, Annaka-shi, Gunma Toho Zinc Co., Ltd.Annaka Smelting Co., Ltd. (72) Inventor Sadao Arai 1443 Nakajuku, Annaka-shi, Gunma Toho Zinc (72) Inventor Kazuyuki Ashige 1443 Nakajuku, Annaka City, Gunma Toho Zinc Co., Ltd.

Claims (2)

[Claims] 1. A whole of a plurality of cathode mother plates taken out from a metal electrolysis tank for electrolysis while keeping a certain distance between them into a polishing device provided with a plurality of roll brush pairs in a comb shape. Then, every other one of the plurality of cathode mother plates is inserted between the roll brushes of each roll brush pair, and the cathode mother plate inserted between the roll brushes of each roll brush pair is simultaneously polished by this polishing device. Next, the entire cathode mother plate is separated from the polishing device, the entire cathode mother plate or the polishing device is moved horizontally by the distance between adjacent cathode mother plates, and the entire cathode mother plate is inserted into this polishing device. Then insert the remaining cathode mother plate between the pair of roll brushes,
A method of polishing a cathode mother plate for electrowinning metal, comprising simultaneously polishing the remaining cathode mother plate inserted between the roll brushes of each pair of roll brushes by a polishing device. 2. A polishing device for simultaneously polishing every other one of a plurality of cathode mother plates taken out from the metal electrolytic bath for electrowinning while keeping the interval therebetween, and the entire cathode mother plate or An elevating device for moving the polishing device up and down, and a moving device for moving the entire cathode mother plate or the polishing device in the horizontal direction, wherein the polishing device is a roll brush of at least half the number of the cathode mother plates. A pair and a rotating device for rotating each roll brush of the roll brush pair, the roll brush pair is arranged horizontally at a predetermined interval and parallel to the cathode mother plate, among the roll brush pair. An apparatus for polishing a cathode mother plate for electrowinning of metal, wherein a distance between the center portions of adjacent pairs of roll brushes is the same as the distance between the cathode cathode plates every other sheet.