JP2007169758A - Electrode for electrolytic metal-smelting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrode for electrolytic metal-smelting, having a structure which does not reduce an electrodeposition area for an electrodepositing metal but makes a clad member hardly peeled from the electrode. <P>SOLUTION: The electrode 1 to be used in the electrolytic metal-smelting has through-holes 11 prepared in edges 2c and 2d of an electrode body 2 so as to penetrate the electrode body 2 from the front surface 2a to the back surface 2b. An insertion material 12 is provided in the through-hole 11. The clad member 5 which covers the edges 2c and 2d of the electrode body 2 and the insertion material 12 are jointed with each other, on the front surface 2a and the back surface 2b of the electrode body 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electrode for metal electrolytic smelting.

  In the electrolytic smelting of metal, the anode plate, which is a crude metal plate, and the cathode plate, which is a metal plate for the cathode, are immersed in an electrolytic solution, and energization is performed on the anode plate and the cathode plate. High purity metal is electrodeposited on the front and back surfaces. The electrodeposited metal is removed from the cathode plate using a scraping blade, etc. after the cathode plate is lifted from the electrolyte, and then recovered. The cathode plate after the electrodeposited metal is peeled off is electrolyzed again. Used for smelting. A covering member made of an insulator is attached to both edge portions of the cathode plate in order to easily peel the electrodeposited metal from the cathode plate (see Patent Documents 1 and 2). The covering member is attached along the edge of the cathode plate. For example, a heat welding sheet such as polyolefin is sandwiched between the inner surface of the covering member and the outer surface of the edge, and heated. Can be glued. Also, a configuration has been proposed in which an insulator for guiding a peeling tool is attached to the upper portion of the covering member in order to facilitate peeling during the electrodeposition metal peeling process (see Patent Document 3).

Japanese Patent Laying-Open No. 2005-29844 Japanese Patent Laid-Open No. 10-71673 Japanese Utility Model Publication No.59-29953

  However, in the conventional cathode plate, the adhesive force of the covering member to the edge of the cathode plate is weak, and there is a problem that the covering member is easily peeled off from the edge of the cathode plate. In order to solve this problem, it is conceivable to increase the adhesive strength of the covering member by increasing the width of the covering member and adhering it to the edge of the cathode plate in a wider area. On the front and back surfaces of the plate, the area on which the electrodeposited metal is electrodeposited is reduced, resulting in a problem that the electrolysis efficiency deteriorates. In addition, even if the covering member and the edge of the cathode plate are bonded in a wide area, if the thermal expansion coefficient of the covering member and the thermal expansion coefficient of the edge of the cathode plate are different from each other, the cathode plate When heated, thermal stresses are generated at the edges of the covering member and the cathode plate, respectively, and a force for peeling off from the edge of the cathode plate is generated at the covering member. Therefore, when the cathode plate is repeatedly used for electrolytic smelting, there is a problem that thermal stress is repeatedly generated and the covering member is easily peeled off.

  The present invention has been made in view of the above points. For metal electrolytic smelting, the covering member can be structured to be difficult to peel off from the electrode without reducing the area on which the electrodeposited metal is electrodeposited. It is an object to provide an electrode.

  In order to solve the above problems, according to the present invention, there is provided an electrode used in metal electrolytic smelting, and a through-hole penetrating the edge of the electrode body between the front side and the back side of the electrode body. An insertion member is provided in the through-hole, and a covering member is provided to cover an edge of the electrode body, and the covering member and the insertion member are provided on the front side and the back side of the electrode body, An electrode for metal electrolytic smelting is provided, characterized in that they are joined together.

  The end of the insert may be joined to the inner surface of the covering member provided along the edge of the electrode body. The covering member may be provided with an insertion hole into which an end of the insertion material is inserted. The insert material and the covering member may be made of a thermoplastic resin, and the softening point of the insert material may be lower than that of the covering member.

  The edge of the electrode body may be substantially linear, and a plurality of the through holes may be provided side by side in the length direction of the edge of the electrode body. The through-hole is formed in the substantially straight edge portion at both end portions of the edge portion, the center portion of the edge portion, and between the both end portions of the edge portion and the center portion of the edge portion. It is good also as each being provided in the position near the both ends of the said edge part rather than the center part.

  Between the covering member and the edge of the electrode body, an adhesive sheet that can be welded to the edge of the covering member and the electrode body is provided, and the covering member is formed through the welding of the adhesive sheet, It may be bonded to the edge of the electrode body. The covering member includes a covering portion that covers a front surface side or a back surface side of an edge portion of the electrode body, and one or more of the inserts are joined to the inner surface of the covering portion, and the inner surface of the covering portion is The total area of the areas where the respective inserts are joined may be 0.15% to 3% with respect to the surface area of the inner surface of the covering portion.

  According to the present invention, the portion covering the surface side of the edge portion of the electrode body in the covering member and the portion covering the back surface side of the edge portion are joined to each other via the insertion member, so that the covering member is detached from the electrode body. Can be prevented. A structure in which the covering member is difficult to peel off from the electrode can be obtained without reducing the area where the electrodeposited metal is electrodeposited.

  Hereinafter, an embodiment according to the present invention will be described based on an electrode having a cathode plate used in metal electrolytic smelting. As shown in FIG. 1, the electrode 1 includes a cathode plate 2 as an electrode body 2 and a head bar 3 used for energization and weight support. The cathode plate 2 is provided with two protectors 5 as covering members.

  The cathode plate 2 is formed in a substantially rectangular thin plate shape, and has a substantially planar surface 2a and a back surface 2b (a front surface and a rear surface in FIG. 1) to which an electrodeposited metal is attached. The material of the cathode plate 2 is a metal such as aluminum.

  The head bar 3 is attached along the upper edge portion of the cathode plate 2, and further, both edge portions that are substantially perpendicular to the upper edge portion of the cathode plate 2 (the left edge portion and the right edge portion in FIG. 1). ) 2c and 2d so as to protrude outward.

  As shown in FIG. 2, the substantially straight straight edges 2 c and 2 d of the cathode plate 2 are respectively formed with thin portions 10 having a thinner thickness than the inner surface 2 a and the back surface 2 b. Each protector 5 is attached to the thin portion 10.

  The thin portion 10 is formed along the entire edges 2c and 2d so as to protrude toward the outside of the edges 2c and 2d, and is provided with a predetermined step with respect to the surface 2a. Further, it has a flat surface 10a on the front surface 2a side, a flat surface 10b on the back surface 2b side provided with a predetermined step with respect to the back surface 2b, and an end surface 2e of the cathode plate 2 substantially perpendicular to the flat surfaces 10a and 10b. ing. The thickness of each thin portion 10, that is, the thickness between the plane 10 a and the plane 10 b is substantially constant over the entire length of the edges 2 c and 2 d. The width of the thin portion 10 when viewed from the front surface 2a side or the back surface 2b side is also substantially constant over the entire length direction of the edge portions 2c and 2d. The thin portion 10 is formed by machining the edges 2c and 2d of the cathode plate 2 by cutting or the like, and is formed integrally and continuously with the main body of the cathode plate 2.

  Each thin-walled portion 10 is provided with a through hole 11 penetrating between the front surface 2a side and the back surface 2b side. As shown in FIG. 1, a plurality of through holes 11 are provided side by side in each thin portion 10. In the illustrated example, five pieces are provided in each thin portion 10. In each thin portion 10, the through holes 11 are arranged in a line along the length direction of each of the edges 2 c and 2 d, and are arranged with an appropriate space between each through hole 11. ing. In the illustrated example, at each edge 2c, 2d, both end portions in the length direction of the thin portion 10 (the upper end on the head bar 3 side and the lower end on the opposite side of the upper end), the central portion of the thin portion 10, A position closer to the upper end than the central portion of the thin portion 10 between the upper end portion and the central portion of the thin portion 10 and a lower portion than the central portion of the thin portion 10 than the central portion of the thin portion 10. One through hole 11 is provided at a position close to the lower end.

  As shown in FIGS. 2 and 3, each through-hole 11 extends along a direction substantially perpendicular to the planes 10 a and 10 b of the thin portions 10 that are substantially parallel to each other, that is, along the thickness direction of the thin portions 10. The opening end of the through hole 11 is opened in the plane 10a and the plane 10b, respectively. Further, each through hole 11 has an opening cross-sectional shape and a constant opening cross-sectional area that form a certain substantially rectangular shape in the thickness direction of the thin portion 10, and have substantially the same shape and size. . Further, the through hole 11 is provided in a state in which the longitudinal direction in the opening cross-sectional shape is directed to the length direction of the thin portion 10 and the short direction in the opening cross-sectional shape is directed to the width direction of the thin portion 10.

  Each through-hole 11 is provided with a rod 12 as an insertion material. Each rod 12 has a substantially rectangular parallelepiped shape that is substantially the same size and shape as the internal space of the through hole 11, and the through hole 11 is closed by inserting the rod 12 into the through hole 11. It has become. Since each rod 12 has substantially the same length as the thickness of the thin portion 10, when inserted into the through hole 11, both end portions 12 a, 12 b on the side of each plane 10 a, 10 b of the rod 12 are The planes 10a and 10b are arranged on substantially the same plane. The material of the rod 12 is, for example, a resin such as polyethylene. Further, the rod body 12 is preferably a thermoplastic resin having a temperature (softening point) at which the rod body 12 starts to melt and soften by heat, which is lower than that of the protector 5. If it does so, in the attachment process of the protector 5 and the rod 12 to the electrode 1 demonstrated in detail later, when the electrode 1 is heated, the rod 12 can be softened without softening the protector 5, and the rod 12 Can be firmly bonded to the protector 5 and the thin portion 10.

  As shown in FIG. 1, the protector 5 has a straight and elongated shape along the edges 2c and 2d, and has a substantially U-shaped cross-sectional shape as shown in FIGS. The entire outer surface of the thin portion 10 can be covered by the inner surface of the protector 5. That is, each protector 5 has a thin plate-like covering portion 5a covering the flat surface 10a of the thin portion 10, a thin plate-like covering portion 5b covering the flat surface 10b, and a thin plate-like covering portion 5c covering the end surface 2e. . The material of the protector 5 is an insulating material, for example, a thermoplastic resin such as polyethylene, and the covering portions 5a, 5b, and 5c are integrally formed of resin. The thickness of the covering portion 5a and the thickness of the covering portion 5b are substantially the same as the step between the flat surface 10a and the front surface 2a and the step between the flat surface 10b and the back surface 2b. Is attached to the thin portion 10 so that the outer surface of the covering portion 5a and the outer surface of the covering portion 5b are respectively continuous with the front surface 2a and the back surface 2b.

  Adhesive sheets 20 are provided between the inner surface of the protector 5 and the outer surface of the thin portion 10 and between the inner surface of the protector 5 and the outer surface of each thin portion 10. The adhesive sheet 20 is, for example, a heat-welded sheet made of polyolefin or the like, and is melted by heating so that it can be welded to the protector 5, the thin portion 10, the rod body 12, and the like.

  The adhesive sheet 20 welds the inner surface of the covering portion 5a and the flat surface 10a on the surface 2a side of the cathode plate 2, and also welds the inner surface of the covering portion 5a and the flat surface of the end portion 12a of each rod body 12. On the back surface 2b side, the inner surface of the covering portion 5b and the flat surface 10b are welded, and the inner surface of the covering portion 5b and the flat surface of the end portion 12b of each rod 12 are welded.

  In the protector 5, the covering portions 5a and 5b are bonded to each other along the flat surfaces 10a and 10b via the adhesive sheet 20, and the covering portion 5a and the covering portion 5b are provided in the through holes 11 respectively. It is fixed to the thin-walled portion 10 in a state of being joined to each other at a plurality of locations, for example, 5 locations via the body 12, and attached along the edge 2c or the edge 2d of the cathode plate 2. As described above, the protector 5 and the both end portions 12a and 12b of the rod 12 are joined to each other on the front surface 2a side and the back surface 2b side of the cathode plate 2, so that the protector 5 has the edge portions 2c and 2d of the cathode plate 2. It comes to be firmly fixed with respect to. In particular, the rod 12 is provided in a plurality of locations in the length direction of the protector 5, and the covering portion 5a and the covering portion 5b are joined at a plurality of locations in the length direction, so that the warp of the protector 5 is reduced. Such deformation and peeling can be effectively prevented over the length direction of the protector 5.

  4 and 5 show a protector holding jig 30 used when the protector 5 is attached to the edges 2c and 2d of the cathode plate 2. FIG. As shown in FIG. 4, the protector holding jig 30 includes a jig body 31 and a plurality of bolts 32, and as shown in FIG. 5, a contact member 33 that is brought into contact with the protector 5 and a bolt 32. An elastic member 34 provided between the distal end portion and the contact member 33 is provided.

  The jig body 31 is formed in an elongated shape having, for example, a substantially U-shaped cross section, and side wall portions 31a and 31b disposed on the front surface 2a side, the back surface 2b side, and the end surface 2e side of the cathode plate 2, respectively. , 31c, and a slit-like space into which the protector 5 is inserted is formed between the side wall portions 31a, 31b. The side wall portion 31a is brought into contact with the outer surface of the covering portion 5a of the protector 5 attached to the edge portion 2c (2b). The side wall portion 31b is arranged close to the outer surface of the covering portion 5b while being separated from the outer surface of the covering portion 5b of the protector 5 attached to the edge portion 2c (2b). The side wall portion 31b is provided with a plurality of screw holes 43 having female screw grooves into which the bolts 32 are screwed. The screw holes 43 are arranged side by side with a predetermined interval in the length direction of the side wall portion 31b. The side wall portion 31c is brought into contact with the outer surface of the covering portion 5c.

  Each bolt 32 includes a head portion 46 and a screw portion 47 in which a male screw groove is formed. The head portion 46 is disposed on the outer side of the side wall portion 31 b and is formed on the inner peripheral surface of the screw hole 43. The threaded portion 47 is screwed into the groove, and the tip of the threaded portion 47 is provided in a state of projecting into the groove on the inner side of the side wall portion 31b. A washer 48 is provided between the head 46 and the outer surface of the side wall 31b.

  The abutting member 33 has a substantially flat plate shape, and is abutted along the outer surface of the covering portion 5 b of the protector 5 inside the jig body 31.

  The elastic member 34 is, for example, a spring washer formed in a substantially annular shape, and is arranged inside the jig main body 31 so as to surround the opening of each screw hole 43 and the periphery of the front end portion of each bolt 32. Further, as shown in FIG. 5, when the protector holding jig 30 is attached to the protector 5, it is provided so as to be sandwiched between the inner surface of the side wall portion 31b and the side surface of the contact member 33, and compressed from both sides. As a result, an elastic force is applied to the contact member 33. The contact member 33 is pressed against the covering portion 5 b of the protector 5 by applying an elastic force from the plurality of elastic members 34. The elastic member 34 is not limited to a spring washer, and may be a disc spring, for example.

  When the protector 5 and the rod 12 are attached to the electrode 1 using the protector holding jig 30 configured as described above, first, in the electrode 1 to which the protector 5 and the rod 12 are not yet attached, the cathode plate 2 Each rod 12 is inserted into each through-hole 11 formed in the edge 2c (see FIG. 3). The rod 12 can be pushed through the opening on the front surface 2a side or the back surface 2b side of the through hole 11. Thereafter, the adhesive sheet 20 is placed on the thin portion 10 of the edge 2c. At this time, the end portions 12 a and 12 b of the rod body 12 are also covered with the adhesive sheet 20. When the adhesive sheet 20 is attached, the protector 5 is attached so as to cover the thin portion 10 of the edge 2c from the outside of the adhesive sheet 20. That is, the adhesive sheet 20 is sandwiched between the inner surface of the protector 5 and the outer surface of the thin portion 10.

  Thus, after the rod body 12, the adhesive sheet 20 and the protector 5 are attached to the edge 2c of the cathode plate 2, the protector holding jig 30 is then attached, and the rod body 12, the adhesive sheet 20 and the protector 5 are held. To be. When attaching the protector holding jig 30 to the cathode plate 2, first, as shown in FIG. 5, the protector 5 provided in the thin portion 10 is provided with a contact member 33 along the outer surface of the covering portion 5 b. The protector 5 and the contact member 33 are provided so as to cover the jig main body 31, and the protector 5 and the contact member 33 are inserted into a groove between the side wall portions 31a and 31b. That is, the side wall 31a is brought close to the cover 5a of the protector 5 and the side wall 31b is made close to the outside of the contact member 33. An elastic member 34 is disposed between the side wall portion 31 b and the contact member 33.

  Thereafter, the screw portions 47 of the bolts 32 provided in the screw holes 43 are respectively tightened. Then, the tip of the bolt 32 is brought into contact with the contact member 33, the contact member 33 is pushed inward by the bolt 32, and the covering portion 5 b of the protector 5 is brought into contact with the thin portion 10 by the contact member 33. It is pressed against. The protector 5 is sandwiched and held by the side wall portion 31a and the contact member 33 from the front surface 2a side and the back surface 2b side, and the jig body 31 is fixed to the cathode plate 2 with the protector 5 inserted. . Due to the pressing force received from the tip of each bolt 32 and the elastic force of each elastic member 34 compressed between the side wall portion 31 b and the contact member 33, the contact member 33 acts against the protector 5. Can be securely pressed.

  Similarly, after attaching the rod 12, the adhesive sheet 20, and the protector 5 to the edge 2d of the cathode plate 2, the protector holding jig 30 is attached and held. Thus, as shown in FIG. 6, when the protectors 5 and the protector holding jig 30 are respectively attached to the edges 2c and 2d, the electrode 1 in such a state is carried into a heating furnace (not shown) to supply hot air, etc. Heat by.

  When the electrode 1 is heated, the adhesive sheets 20 sandwiched between the protectors 5 and the thin portions 10 are respectively in a molten state. Moreover, the rod 12 put in each through-hole 11 is softened. The adhesive sheet 20 is in close contact with the inner surface of the protector 5 and the thin portion 10 without any gap. Further, the rod 12 can be deformed so as to match the inner shape of the through hole 11, and the outer surface (softened surface) of the rod 12 is brought into close contact with the inner surface of the through hole 11 without any gap. The heating temperature may be adjusted to a temperature that is equal to or higher than the melting point of the adhesive sheet 20 and the softening point of the rod 12 and lower than the softening point of the protector 5. If it does so, the fusion | melting of the adhesive sheet 20 and the softening of the rod 12 can be performed reliably, without making the protector 5 deform | transform excessively.

  Further, when the rod 12 is softened, it is preferable to avoid contact of outside air (oxygen) with the rod 12. If it does so, it can prevent that the oxide film (The oxide film of polyethylene, when the rod 12 is polyethylene) is formed in the outer surface of the rod 12. That is, it is possible to prevent the oxide film from inhibiting the bonding of the rod 12, and the adhesion between the rod 12 and the adhesive sheet 20 and the adhesion between the rod 12 and the inner surface of the through-hole 11 are further improved. The rod body 12 can be reliably bonded to the thin wall portion 10 and the front surface side (covering portion 5a) and back surface side (covering portion 5b) of the protector 5. For this reason, it is possible to prevent the protector from being peeled off due to thermal expansion and to prolong the service life.

  After heating, the electrode 1 is taken out of the heating furnace and left until the temperature of the electrode 1 is sufficiently lowered. Then, each adhesive sheet 20 and each rod 12 are cooled and solidified. Each adhesive sheet 20 is solidified and bonded to each protector 5, the thin portion 10, and both end portions 12 a and 12 b of the rod body 12 without any gaps. Thereby, the inner surface of the protector 5 and the outer surface of the thin part 10 are joined through the adhesive sheet 20 without any gaps. Further, the inner surface of the protector 5 and the both end portions 12a and 12b of each rod 12 are joined to each other through the adhesive sheet 20 without a gap. That is, the covering portion 5 a and the covering portion 5 b of the protector 5 are joined to each other through the rod body 12 that is passed through each through hole 11. The rod 12 is solidified and joined in a state where the entire outer surface is in close contact with the inner surface of the through hole 11. Thus, by solidifying the rod body 12 after being softened, the adhesion between the outer surface of the rod body 12 and the inner surface of the through-hole 11 can be increased, and the rod body 12 can be made to the thin portion 10. And can be firmly joined.

  As described above, while the protectors 5 and the thin-walled portions 10 or the rods 12 are welded by melting and solidifying the adhesive sheet 20, the protectors 5 are securely sandwiched by the protector holding jig 30. Is retained. Therefore, it is possible to reliably prevent the protector 5, the adhesive sheet 20, and the rod body 12 from being displaced from the thin portion 10, and the protector 5 can be attached at an accurate position. In addition, the protector 5 is held against the flat surfaces 10a and 10b of the thin-walled portion 10 and both ends 12a and 12b of the rod body 12 from the front surface 2a side and the back surface 2b side, whereby the adhesive sheet 20 is added. Pressed to ensure welding.

  Thus, when performing electrolytic smelting using the electrode 1 to which the protector 5 is attached, the head bar 3 is held in a state where the cathode plate 2 is immersed in the electrolytic solution in the electrolytic cell. A power source is connected to the head bar 3, and the cathode plate 2 is connected to the power source via the head bar 3. Further, an anode plate, which is a rough metal plate immersed in the same electrolyte as that of the cathode plate 2, is connected to a power source and energized, whereby the purity of the surface 2a and the back surface 2b of the cathode plate 2 is increased. High metal is electrodeposited. In the electrode 1, the metal is not electrodeposited on the protector 5 made of an insulator, and the metal is electrodeposited only on the conductive front surface 2 a and the back surface 2 b exposed inside the protector 5. When recovering the electrodeposited metal, an electrodeposition tool such as a blade for stripping the electrodeposited metal is inserted between the electrodeposited metal layer and the front surface 2a or the back surface 2b from the protector 5 side. The metal can be easily peeled off. The electrode 1 after the electrodeposited metal is peeled off can be used again for electrolytic smelting.

  When the electrode 1 is used for electrolytic smelting a plurality of times and then removed from the cathode plate 2 when the protector 5 or the rod 12 is replaced, the electrode 1 is again heated by a heating furnace or the like, and the adhesive sheet 20 May be brought into a molten state. Thereby, the adhesive force of the adhesive sheet 20 is weakened so that the inner surface of each protector 5 and the outer surface of each thin portion 10 can be separated, and the inner surface of each protector 5 and both end portions 12a of each rod 12 12b can be separated. When the adhesive sheet 20 is melted, the protector 5 and the adhesive sheet 20 are peeled from the thin portion 10, and the rod 12 is extracted from the through hole 11. Then, what is necessary is just to attach the new rod 12, the adhesive sheet 20, and the protector 5. FIG. As described above, the attaching / detaching operation and the replacing operation of the protector 5 and the rod body 12 can be easily performed, and the working efficiency is good.

  According to the electrode 1, in each protector 5, the covering portion 5a covering the surface 2a side of the edge portion 2c (2d) of the cathode plate 2 and the covering portion 5b covering the back surface 2b side of the edge portion 2c (2d) are provided. By adopting a configuration in which the rods 12 are joined to each other, the protector 5 can be reinforced, and the protector 5 can be effectively prevented from being detached from the cathode plate 2 or from being deformed. In particular, when the protector 5 and the thin portion 10 are bonded without a gap, if the coefficient of thermal expansion of the protector 5 and the thin portion 10 is different from each other, when the electrode 1 is heated during electrolytic smelting, Although a force to peel off from the thin wall portion 10 is generated, the covering portions 5a and 5b of the protector 5 are joined to each other by the rod body 12, thereby preventing the covering portions 5a and 5b from being separated from the thin wall portion 10. it can. That is, by suppressing the thermal deformation of the protector 5, the protector 5 can be effectively prevented from being peeled off. In addition, when the electrode 1 is repeatedly used for electrolytic smelting, or when the electrodeposition metal is peeled off from the cathode plate 2, the protector 5 is not easily peeled off even if the protector hits the protector. It is possible to reduce the frequency of replacement work and the like. Therefore, the cost required for the protector 5 and the adhesive sheet 20 can be reduced. Furthermore, it is possible to extend the life of the protector 5 (the period during which the protector 5 can be used without repairing the protector 5) longer than the life of the cathode plate 2. That is, while the cathode plate 2 is repeatedly used for electrolytic smelting, the protector 5 attached at the beginning can be used until the end of the life of the cathode plate 2 without performing any repair work on the protector 5. In this case, labor costs and labor required for repair work of the protector 5 are completely eliminated, and the cathode plate 2 can be used efficiently, thereby greatly improving the production efficiency of the entire electrolytic smelting process. be able to.

  Further, by joining the covering portions 5a and 5b with the rod body 12, the protector 5 is reinforced and the adhesive force of the protector 5 is improved even if the area where the inner surface of the protector 5 and the outer surface of the thin portion 10 are bonded is small. Can be made. That is, without increasing the width of the protector 5 or the thin wall portion 10 or reducing the area where the electrodeposited metal is electrodeposited (surface area of the front surface 2a and the back surface 2b), the adhesive force of the protector 5 is improved and the protector is improved. 5 can be made to be a structure that does not easily peel off from the electrode 1. By reducing the width of the protector 5 and the thin-walled portion 10 and ensuring a large area for electrodeposition of the electrodeposited metal, it is possible to improve the electrolysis efficiency and increase the productivity of the metal in electrolytic smelting. By reducing the width of the protector 5 and the thin wall portion 10, the production efficiency of electrolytic smelting can be improved by 1% or more than before. In addition, the thin-walled portion 10 of the electrode 1 that has been used in the past can be simply and reliably improved in the adhesive strength of the protector 5 simply by providing a rod 12 having a low softening point by forming a through-hole 11. It is economical because it requires less cost for improvement.

  The preferred embodiments of the present invention have been described above, but the present invention is not limited to such examples. It is obvious for those skilled in the art that various changes and modifications can be conceived within the scope of the technical idea described in the claims. It is understood that it belongs to.

  For example, in the above embodiment, in a state where the rod 12 is inserted into the through hole 11, both end portions 12a and 12b of the rod 12 are arranged on substantially the same plane as the planes 10a and 10b of the thin portion 10 respectively. However, as shown in FIG. 7, the end 12a (12b) of the rod 12 may protrude slightly outward from the plane 10a (10b). Also in this case, the end portions 12a and 12b are pressure-bonded to the protector 5, and the bonding can be strengthened. If the end portion 12a (12b) of the rod 12 is protruded too much, the cover portions 5a and 5b of the protector 5 are pushed outward by the end portion 12a (12b), and the outer surfaces of the cover portions 5a and 5b are raised. There is a risk that it will be too much. In this case, when the electrodeposited metal is peeled from the cathode plate 2, when a peeling tool such as a blade is inserted between the electrodeposited metal layer and the front surface 2a and the back surface 2b from the side of the covering portions 5a and 5b, The peeling tool is easily caught on the ridges of 5a and 5b, and the risk of the protector 5 being peeled off increases. Therefore, the protruding length of the end portion 12a (12b) (the width between the end portion 12a (12b) and the plane 10a (10b)) is preferably suppressed to an appropriate size, for example, about 2 mm or less. .

  For example, as shown in FIG. 8, the protector 5 may be provided with an insertion hole 60 into which the ends 12a and 12b of the rod 12 are inserted. In the illustrated example, the insertion hole 60 is formed in each of the covering portions 5a and 5b so as to penetrate between the inner surface and the outer surface of the covering portions 5a and 5b, and is substantially the same as the cross-sectional shape of the rod body 12. It has a rectangular opening cross-sectional shape. Each insertion hole 60 is provided at a position corresponding to each through-hole 11 provided in the thin portion 10. When the protector 5 is attached to the thin portion 10, the front surface 2 a side and the back surface side are provided. In 2b, it communicates with the end opening of each through hole 11 respectively. In this configuration, when the rod body 12 is provided in the through-hole 11, both end portions 12a and 12b of the rod body 12 are projected outward from the planes 10a and 10b, and each of the protectors 5 provided in the thin portion 10 is provided. They are inserted into the insertion holes 60 of the covering portions 5a and 5b, respectively. The outer surfaces of both end portions 12 a and 12 b are joined to the inner surface of the insertion hole 60. Thus, even if it joins in the state which inserted the edge parts 12a and 12b of the rod 12 in the protector 5, the protector 5 and the rod 12 can be joined firmly.

  The rod body 12 is bonded to the protector 5 and the thin wall portion 10 by softening and solidifying the surface thereof. For example, the rod body 12 is bonded to the protector 5 and the through hole 11 by a bonding force of an adhesive sheet or an adhesive. It is good also as a structure joined.

  In the above embodiment, the insertion material is the rod body 12 that is molded in a substantially rectangular parallelepiped shape in advance, and has been illustrated as being inserted and mounted through the opening on the front surface 2a side or the back surface 2b side of the through hole 11. An aspect is not limited to this. For example, the insertion material may be filled in the through hole 11 by pouring a fluid resin into the through hole 11 and solidifying it.

  In the above embodiment, the through-hole 11 and the rod body 12 include both end portions of the respective edge portions 2c and 2d, the central portion of each of the edge portions 2c and 2d, and both end portions and the central portion of each of the edge portions 2c and 2d. In the meantime, one piece is provided at a position closer to both end portions than the central portion, but the arrangement of the through holes 11 and the rod bodies 12 is not limited to such a form. For example, the through holes 11 and the rod bodies 12 may be arranged at equal intervals in the length direction of the edges 2c and 2d. Further, the number of through holes 11 and the number of rods 12 are not limited to the five shown in the embodiment. That is, the number of portions to which the rod body 12 is joined on the inner surfaces of the covering portions 5a and 5b facing the edge portions 2c and 2d can be 1 or an arbitrary number of 2 or more. If the number of the rods 12 is four or more, that is, if the covering portions 5a and 5b are joined at four or more locations, the adhesive force between the edge 2c (2d) and the protector 5 is particularly effectively improved. be able to. The more the number of rods 12, that is, the more the portions where the covering portions 5a and 5b are joined, the stronger the protector 5 is reinforced, and the adhesive force between the edge 2c (2d) and the protector 5 is improved. However, if the number of through holes 11 is too large, the strength of the edge 2c (2d) may be too low. In addition, there is a concern that work and processing costs when opening the through hole 11 are increased. Furthermore, when attaching / detaching the protector 5 and the rod 12 to / from the edge 2c (2d), the work of inserting / extracting the rod 12 into / from each through hole 11 is troublesome and takes time. appear. For this reason, it is preferable that the number of through holes 11 be an appropriate number. For example, if the number is about 9 or less, the strength of the edge 2c (2d) is secured, and the processing cost of the through holes 11 is suppressed, while the protector 5 is reduced. It is possible to effectively enhance the adhesive force.

  For example, when seven through holes 11 are provided, as shown in FIG. 9, one through hole 11 is provided at each end of each edge 2c, 2d and at the center of each edge 2c, 2d. In addition, two through holes 11 may be provided side by side between the through hole 11 provided at both ends of each edge 2c, 2d and the through hole 11 at the center. In the illustrated example, the five through holes 11 located second to sixth from the upper end in each of the edges 2c and 2d are arranged at almost equal intervals. On the other hand, in each of the edges 2c and 2d, the distance between the through hole 11 located on the uppermost side and the through hole 11 located second from the upper end is between the second to sixth through holes 11 from the upper end. It is narrower than the interval provided in. Further, the interval between the through hole 11 located at the sixth position from the upper end and the through hole 11 located at the seventh position from the upper end (that is, the lowest end side) is the second through sixth through holes 11 from the upper end. It is narrower than the interval provided between them, and is substantially equal to the interval between the through hole 11 located at the uppermost end and the through hole 11 located second from the upper end. That is, in each edge 2c, 2d, the seven through-holes 11 are arranged symmetrically around the center of each edge 2c, 2d. In addition, according to the knowledge of the present inventors, the interval between the through holes 11 (that is, the interval between the portions where the covering portions 5a and 5b are joined by the rod body 12) is set to the edge portion 2c. , 2d can be made narrower at the upper end side or the lower end side than the center side, so that the adhesive force of the protector 5 can be improved as compared with the case where the intervals between the through holes 11 are all equal (described later). (See Experiment 2).

  Further, the shape of the protector 5, the shape of the thin portion 10, the shape of the through hole 11, the shape of the rod 12 and the like are not limited to those shown in the above embodiment. For example, the through hole 11 may be a circular hole, and the rod body 12 may be a round bar. The shape and size of each through hole 11 may be different from each other. The shape and size of the rod 12 need only match the shape of the corresponding through hole 11 and may not be the same shape and size. In addition, when making the through-hole 11 into a circular hole, it is good also as a screw hole by which the internal thread groove was formed in the internal peripheral surface of the through-hole 11. FIG. That is, a male screw groove is formed on the outer peripheral surface of the rod body 12, and the rod body 12 is inserted into the through hole 11 with the female screw groove of the through hole 11 and the male screw groove of the rod body 12 screwed together. You may make it let it. By doing so, the rod 12 is softened in a state where the rod 12 is more closely attached to the through-hole 11, so that an oxide film is not generated on the outer surface of the rod 12 and the covering portion of the protector 5 is covered. 5a and the rod body 12, and the coating | coated part 5b and the rod body 12 can be joined firmly mutually.

  The outer surface of the protector 5 and the outer surface of the thin-walled portion 10 are preferably made smooth so that the adhesive force between the protector 5 and the thin-walled portion 10 can be obtained. However, the outer surface of the protector 5 and the outer surface of the thin-walled portion 10 are not necessarily When the protector 5 and the cathode 2 have different coefficients of thermal expansion, a rough surface or irregularities may be formed on these surfaces. In this case, the adhesiveness of the adhesive sheet 20 can be improved, and welding can be suitably performed. That is, the component of the adhesive sheet 20 melted by heating penetrates into the rough surface and the unevenness and solidifies in that state, so that the adhesive sheet 20 can be firmly bonded.

  As shown in FIGS. 10 and 11, air is collected on the inner surface of the protector 5 between the inner surface of the protector 5 and the outer surface of the thin portion 10, between the inner surface of the through hole 11 and the outer surface of the rod 12, and the like. For this purpose, a groove 100 may be formed. In the illustrated example, the groove 100 is provided in the covering portion 5c of the protector 5 so as to be recessed from the inner surface of the covering portion 5c, and corresponds to each of the through holes 11 and the rod body 12 one by one. As shown, each of the through holes 11 and the rod body 12 is disposed in the vicinity. In this configuration, when the protector 5 is attached to the thin portion 10, a cavity 101 is formed between the groove 100 and the end surface 2 e of the thin portion 10. When the cavity 101 is formed in this way, in the process of bonding the protector 5 to the thin portion 10, when the protector 5 and the rod body 12 are heated with the thin portion 10 attached to the protector 5, When the rod 12 is thermally expanded, it is possible to provide a margin for air to escape from the through hole 11. That is, even if a gap is formed between the inner surface of the through hole 11 and the outer surface of the rod body 12, the air in the gap is pushed out of the through hole 11 by the outer surface of the thermally expanded rod body 12, and the plane 10a It is expelled into the cavity 101 between the adhesive sheet 20 or between the flat surface 10 b and the adhesive sheet 20. Therefore, the inner surface of the through-hole 11 and the outer surface of the rod body 12 can be reliably joined without a gap. Thereby, the rod 12 can be firmly bonded to the through-hole 11, and consequently, the covering portions 5 a and 5 b of the protector 5 can be firmly bonded to the thin portion 10. In particular, when the adhesive sheet 20 is melted by heat, or when the rod body 12 is softened by heat, the plane 10a and the adhesive sheet 20 between the inner surface of the through hole 11 and the outer surface of the rod body 12 During this, air easily escapes from between the flat surface 10b and the adhesive sheet 20. When the rod body 12 is softened and solidified and joined to the protector 5 or the thin wall portion 10, an oxide film is formed on the molten surface of the rod body 12 by releasing air (oxygen) from the vicinity of the molten surface of the rod body 12. Can be prevented from being formed. That is, it is possible to prevent the rod body 12 from being obstructed by the oxide film, and the rod body 12 can be reliably bonded to the thin portion 10 and the protector 5.

  Furthermore, the inner surface of the protector 5 may be provided with a communication groove 102 that connects the portion where the end 12 a of the rod 12 is joined to the groove 100. In the illustrated example, the communication groove 102 is provided in the covering portion 5a of the protector 5 so as to be recessed from the inner surface of the covering portion 5a and to extend substantially perpendicularly to the inner surface of the covering portion 5c. ing. In a state where the protector 5 is attached to the thin portion 10, a communication path 103 is formed between the communication groove 102 and the flat surface 10 a of the thin portion 10. The communication path 103 is formed so that the portion where the end 12a is joined and the cavity 101 are communicated. In this way, the air in the through hole 11 can easily escape to the cavity 101 through the communication path 103. Similarly, a communication groove 102 may be provided between a portion where the end 12 b of the rod 12 is joined and the groove 100. Also in this case, air can escape smoothly.

  In the process of bonding the protector 5 to the thin wall portion 10, when the protector 5 is held by the protector holding jig 30 or the like, only the covering portions 5a and 5b are pressed from the front surface 2a side and the back surface 2b side. It is preferable not to apply a pressing force to the portion 5c. In particular, it is preferable not to apply a pressing force from the outside of the groove 100. For example, when holding using the protector holding jig 30, it is preferable that the inner surface of the jig main body 31 is not in contact with the outer surface of the covering portion 5c but is provided with a gap. In this way, the inside of the cavity 101 is not compressed, and the air in the through hole 11 can escape into the cavity 101 with a margin.

(Examination of bonding area, etc.)
The inventors examined specific examples of the dimensions of the thin portion 10 and the through-hole 11, the bonding area of the rod 12 to the protector 5, and the like. FIG. 12 shows an example. In addition, the code | symbol attached | subjected with respect to each structure in FIG. 12 each respond | corresponds with either of the code | symbol attached | subjected with respect to each structure in description of the said embodiment, and the structure which mutually attached the same code | symbol Means that they have substantially the same configuration. The number with unit [mm] means the dimension. As shown in FIG. 12, the thickness of the cathode plate 2 was 6 mm, the width of the thin portion 10 at each edge 2c, 2d was 15 mm, the length was 1150 mm, and the thickness of the thin portion 10 was 2 mm. The surface areas of the flat surfaces 10a and 10b are 17250 mm ² (= 15 mm × 1150 mm), respectively. The through hole 11 was a circular hole having a diameter of 3 mm, and the distance from the inner edge of the thin portion 10 to the center of the through hole 11 was formed at a position of 7.5 mm. The rod 12 has a cylindrical shape with a diameter of 3 mm and a height of 2 mm. Each end 12a, 12b surface area, i.e., the coating unit 5a (or the covering portion 5b) bonding area of the inner surface rod 12 is joined to the portion of the (insert material bonding area) _{A 1} is about 7. 07 mm ² . The width of the protector 5 was 20 mm, and the thickness was 6 mm. The covering portions 5a and 5b have a thickness of 2 mm, the covering portion 5c has a width of 5 mm, and a thickness of 6 mm. Surface area _{A 0} of each of the coated portions 5a, 5b inner surface are the same as the respective planes 10a, 10b surface area (17250mm ^2). The surface area _{A 0} is equal to the adhesion area (planar bonding area) _{A 2,} the sum with all the insert material bonding area _{A 1,} the area between the inner surface and the plane 10a (10b) of the cover portion 5a (5b) (A ₀ = A ₂ + A ₁ × (number of rods 12)). The width between the outer surface of the covering portion 5c on the edge 2c side and the outer surface of the covering portion 5c on the edge 2d side was 810 mm.

In such a cathode plate 2, when four through holes 11 are provided and the rod bodies 12 respectively provided in the through holes 11 are joined to the covering portions 5a, that is, the rods are connected to the inner surface of the covering portion 5a. If the end 12a of the body 12 are joined at positions 4, these total area (total insertion material bonding _area) which is the sum of insertion member joining area _{a 1} of the four locations _{a t (a t = a 1} × ( rod 12 ) = A ₁ × 4) is about 28.3 mm ² . The proportion of the total insertion member joining area _{A t} to the surface area _{A 0} of the inner surface of the covering portion 5a is about _{0.16% (= A t / A} 0 × 100).

The total if the through-holes 11 are provided nine, i.e., when the end portion 12a of the rod 12 against the inner surface of the covering portion 5a is joined in nine locations, the insertion member junction area A ₁ of nine the total insert material bonding area _{a t} which is approximately _{^{63.6mm 2 (= a 1 × 9}} ). That is, the ratio of the total insertion member joining area _{A t} to the surface area _{A 0} in the coating section 5a is about _{0.37% (= A t / A} 0 × 100).

In view of the above calculations and the like, the total insertion material bonding area A _t of the inner surface of the cover portion 5a, so that the ratio to the surface area A ₀ of the inner surface of the covering portion 5a is in the range of about 0.15% to 3% Is considered desirable. Similarly, the total insertion member joining area A _t of the inner surface of the covering portion 5b of the back surface side, it is to ensure that the ratio to the surface area A ₀ of the inner surface of the covering portion 5b is in the range of about 0.15% to 3% It is considered desirable.

(Experiment 1)
In order to confirm the effect of the joint structure of the protector according to the present embodiment, the following experiment 1 for comparing the adhesive strength was performed. First, a flat metal piece 70 having a substantially rectangular shape as shown in FIG. 13 was prepared. Each metal piece 70 was formed with a thin portion 71 having a predetermined width and thickness along the edge (upper edge in FIG. 13). Further, two coating members 72 made of the same material as the protector actually used for the electrodes were prepared and attached to both side surfaces of the thin portion 71, respectively. Each covering member 72 was formed in an elongated substantially rectangular strip shape having substantially the same length and width as the thin portion 71. The covering member 72 is adhered along the flat surface 71a between one end and the vicinity of the intermediate portion in the longitudinal direction of the thin portion 71, and is not adhered between the flat surface 71a and the other end portion of the thin portion 71. Attached. The covering member 72 was joined by the following four methods, and four types of test pieces T1, T2, T3, and T4 were prepared.

(Specimen T1)
As shown in FIG. 14, the thin portion 71 was not particularly processed, and the covering member 72 was provided on both surfaces of the thin portion 71 via an adhesive sheet 73. In this state, each covering member 72 was pressed and held from the outside, heated, and both surfaces of the thin portion 71 and each covering member 72 were bonded to each other by welding of the adhesive sheet 73 to prepare a test piece T1.

(Specimen T2)
As shown in FIG. 15, a substantially rectangular through hole 75 was opened in the region of the flat surface 71 a of the thin portion 71 so as to penetrate in the thickness direction. The through hole 75 was formed such that its longitudinal direction was along the length direction of the thin portion 71 and its short direction was along the width direction of the thin portion 71. As shown in FIG. 16, a covering member 72 is provided on both surfaces of the thin portion 71 via an adhesive sheet 73. In this state, each covering member 72 was pressed and held from the outside, heated, and both surfaces of the thin portion 71 and each covering member 72 were bonded to each other by welding of the adhesive sheet 73 to prepare a test piece T2. In this case, when heating is performed, the inner surface of the covering member 72 is softened and deformed, and the covering member 72 is pushed from the outside, so that the inner surface of the covering member 72 becomes the front surface 2a side and the back surface 2b of the through hole 75. Invade the side opening. For this reason, as shown in the drawing, the inner side of the covering member 72 is joined in a state of being bitten near the opening end of the through hole 75.

(Specimen T3)
As shown in FIG. 17, the through-hole 75 was opened in the thin part 71 similarly to the test piece T2. Each covering member 72 is provided with an insertion hole 81 communicating with the through hole 75. Further, the both sides of the thin portion 71 are provided with the covering member 72 via the adhesive sheet 73, and the substantially rectangular parallelepiped insertion material so as to penetrate through the through hole 75 and the insertion holes 81, 81 of each covering member 72. 82 was inserted. In this state, each covering member 72 is pressed and held from the outside, is heated, and both surfaces of the thin portion 71 and each covering member 72 are bonded to each other by welding of the adhesive sheet 73, and the outer surface of the insertion member 82 is attached. A test piece T3 was prepared by softening and solidifying it and joining it to the inner surface of the through hole 75, and softening and solidifying both ends of the insertion member 82 to join to the inner surface of each insertion hole 81, respectively.

(Specimen T4)
Similar to the test pieces T2 and T3, the through-hole 75 was opened in the thin portion 71. As shown in FIG. 18, a substantially rectangular parallelepiped insert 83 having the same size as the internal space of the through hole 75 was inserted into the through hole 75. And the coating | coated member 72 was provided through the adhesive sheet 73 with respect to both surfaces of the thin part 71. FIG. In this state, each covering member 72 is pressed and held from the outside, heated, and both surfaces of the thin portion 71 and each covering member 72 are bonded to each other by welding of the adhesive sheet 73, and the outer surface of the insertion member 83 is attached. A test piece T4 was prepared by softening and solidifying the material and joining it to the inner surface of the through-hole 75 and joining both ends of the insert 83 to the inner plane of each covering member 72.

  A tensile test of the covering member 72 was performed on the above test pieces T1, T2, T3, and T4. As shown in FIG. 19, the metal piece 70 is fixed and held, and the portion not bonded to the thin portion 71 of each covering member 72 is bonded to the opposite side from the outside of the covering member 72, that is, each thin portion 71. Each end of the covering member 72 was held on the chuck of the tensile tester outside the end of the thin wall portion 71. Then, the tensile strength of the covering member 72 (that is, the adhesive strength with respect to the thin portion 71) was measured by pulling each covering member 72 outward in the direction along the length direction of the thin portion 71 by the chuck. The tensile speed was 50 mm / min. The results are shown in Table 1.

  From this experimental result, it was confirmed that the test piece T4 has the highest tensile strength. Moreover, the strength of the structure of the test piece T3 was also obtained. Therefore, it was confirmed that the adhesive force of the protector can be improved by the structure described in the above embodiment. In order to prevent the protector 5 from being peeled when the electrodeposited metal is peeled, it is considered that the tensile strength is preferably about 500 N / cm or more, for example. Therefore, the structures of the test pieces T3 and T4 that can obtain a tensile strength of about 500 N / cm or more are particularly excellent, and it is considered that the protector 5 can be effectively prevented from peeling off. The test piece T3 has a lower tensile strength than the test piece T4. In the test piece T3, the end of the insert 82 is exposed from the covering member 72 and is easily exposed to the outside air (oxygen). When the outer surface of the insertion member 82 is softened by heating, oxygen enters from between the inner surface of the insertion hole 81 and the insertion member 82, and an oxide film is formed on the outer surface of the insertion member 82. Is considered to have decreased. On the other hand, in the test piece T4, since the end portion of the insertion member 83 is covered with the covering member 72, it does not come into contact with the outside air, and an oxide film can be prevented from being formed on the outer surface of the insertion member 83. For this reason, it is considered that the decrease in adhesive strength could be prevented. Thus, it is considered that the adhesive force can be further improved by heating the insertion material in a state where it is not exposed to the outside air (oxygen).

(Experiment 2)
In order to confirm the effect of the protector joining method, the following experiment 2 was performed. In Experiment 2, three types of electrodes 1 having through-holes 90 formed at different positions as shown in FIGS. 20, 21, and 22 were used as test bodies E1, E2, and E3. Each through-hole 90 was circular with the same size.

(Specimen E1)
As shown in FIG. 20, the through-holes 90 are respectively provided at both end portions of the thin-walled portion 10, the central portion of the thin-walled portion 10, and the intermediate portion between the through-hole 90 at the central portion and the through-holes 90 at both end portions. Arranged one by one. That is, a total of five through-holes 90 were provided side by side with a predetermined equal interval. Then, each through hole 90 was provided with an insert, and the protector 5 was joined in the same manner as described in the above embodiment.

(Specimen E2)
As shown in FIG. 21, the through-holes are located at both ends of the thin portion 10, the central portion of the thin portion 10, and between the both end portions and the central portion of the thin portion 10, closer to both end portions than the central portion. One 90 is provided, and a total of five through holes 90 are provided. That is, it corresponds to the arrangement of the through holes 11 described in the above embodiment. Then, each through hole 90 was provided with an insert, and the protector 5 was joined in the same manner as described in the above embodiment.

(Specimen E3)
As shown in FIG. 22, one through hole 90 is arranged at each end of the thin portion 10 and at the central portion of the thin portion 10. That is, a total of three through-holes 90 were provided side by side with a predetermined equal interval. Then, each through hole 90 was provided with an insert, and the protector 5 was joined in the same manner as described in the above embodiment.

  Ten specimens E1, E2, E3 as described above were prepared. These three types, a total of 30 specimens E1, E2, E3, were immersed in the electrolytic solution in the electrolytic cell and used for about 328 days, and then the state of the protector 5 was examined. The remaining rate [%] after the target period (2 years (about 730 days), which is the average life of the cathode plate 2) has passed, based on the number of test specimens in which defects such as peeling of the protector 5 occurred. (Probability of being normally joined without any) and the average life of the protector 5 (the period during which the remaining rate is 50% or less) was calculated by a statistical method. The results are shown in Table 2.

  As a result of the experiment, it was found that the specimen E2 was most excellent in both the remaining rate and the average life. Therefore, the arrangement of the through holes is considered to be most preferable in the form of the test body E2, that is, the form in which the interval between the adjacent through holes is narrower on both end sides than on the central part side of the thin portion 10. In particular, in the structure of the test body E2, the average life of the protector 5 could be greatly extended to 4 years (about 1460 days) or more. That is, it was possible to extend the life of the cathode plate 2 to more than twice the average life (about 730 days (about 2 years)). Moreover, compared with the average life (about 420 days) of the protector 5 in the electrode of the conventional structure which does not provide a through-hole, it was able to be extended about 3.7 times. In the electrode of the conventional structure, the average life of the protector 5 (about 420 days) is about ½ of the average life of the cathode plate 2 (about 730 days), and before the cathode plate 2 can no longer be used, It was necessary to repair the protector 5 at least once. On the other hand, according to the structure of the test body E2, the average life of the protector 5 is much longer than the average life of the cathode plate 2, so that the protector 5 that is attached first is not repaired once. It is estimated that it is possible to use until the end.

  The present invention can be applied to an electrode used when electrolytic smelting of non-ferrous metals such as copper and zinc.

It is a schematic perspective view of the electrode concerning this embodiment. It is a schematic sectional drawing explaining the structure of the edge part of a cathode plate. It is a schematic sectional drawing explaining the structure of a through-hole vicinity. It is a schematic perspective view of a protector holding jig. It is sectional drawing of the jig for protector holding | maintenance. It is a schematic perspective view of the electrode which attached the jig for protector holding. It is explanatory drawing explaining embodiment which made the rod body bite into a thin part. It is a schematic sectional drawing explaining the structure which provided the insertion hole which inserts the edge part of a rod. It is the schematic perspective view of the electrode which showed an example of arrangement | positioning of a through-hole at the time of providing seven through-holes in each thin part. It is a schematic sectional drawing explaining the structure of the edge part of a cathode plate concerning embodiment which provided the groove | channel in the protector. It is a schematic sectional drawing by the II line in FIG. It is the schematic sectional drawing which showed the specific dimension regarding the structure of the edge part vicinity of a cathode plate. 2 is a schematic perspective view of a test piece used in Experiment 1. FIG. It is the schematic sectional drawing which showed the thin part vicinity of test piece T1. It is a schematic perspective view explaining the through-hole formed in test piece T2, T3, T4. It is the schematic sectional drawing which showed the thin part vicinity of test piece T2. It is the schematic sectional drawing which showed the thin part vicinity of test piece T3. It is the schematic sectional drawing which showed the thin part vicinity of test piece T4. 6 is an explanatory diagram for explaining a method of a tensile test in Experiment 1. FIG. FIG. 10 is an explanatory diagram for explaining the arrangement of through holes of a test body E1 in Experiment 2. FIG. 10 is an explanatory diagram for explaining the arrangement of through holes of a test body E2 in Experiment 2. 10 is an explanatory diagram for explaining the arrangement of through holes of a test body E3 in Experiment 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electrode 2 Cathode plate 2a Front surface 2b Back surface 2c, 2d Edge 5 Protector 10 Thin part 11 Through-hole 12 Rod body 20 Adhesive sheet 30 Jig for holding a protector

Claims (8)

An electrode used in metal electrolytic smelting,
A through-hole penetrating between the front side and the back side of the electrode body is provided at the edge of the electrode body,
An insertion material is provided in the through hole,
A covering member covering the edge of the electrode body is provided;
An electrode for metal electrolytic smelting, wherein the covering member and the insert are joined to each other on the front surface side and the back surface side of the electrode body. 2. The electrode for metal electrolytic smelting according to claim 1, wherein an end of the insert is joined to an inner surface of the covering member provided along an edge of the electrode body. . The electrode for metal electrolytic smelting according to claim 1, wherein the covering member includes an insertion hole into which an end of the insertion material is inserted. The insert and the covering member are made of a thermoplastic resin,
The electrode for metal electrolytic smelting according to claim 1 or 2, wherein the softening point of the insert is lower than that of the covering member. The edge of the electrode body is substantially straight,
The electrode for metal electrolytic smelting according to any one of claims 1 to 4, wherein a plurality of the through holes are provided side by side in the length direction of the edge of the electrode body. The through-holes are formed at both ends of the edge, at the center of the edge, and between the both ends of the edge and the center of the edge. 6. The electrode for metal electrolytic smelting according to claim 5, wherein the electrode is provided at a position close to both ends. An adhesive sheet that can be welded to the edge of the covering member and the electrode body is provided between the covering member and the edge of the electrode body,
The electrode for metal electrolytic smelting according to any one of claims 1 to 6, wherein the covering member is bonded to an edge of the electrode body by welding of the adhesive sheet. The covering member includes a covering portion that covers the front side or the back side of the edge of the electrode body,
One or more of the inserts are joined to the inner surface of the covering portion,
The total area of the areas where the respective insertion members are bonded to the inner surface of the covering portion is 0.15% to 3% with respect to the surface area of the inner surface of the covering portion. The electrode for metal electrolytic smelting in any one of 1-7.

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