JP2615863B2 - Cathode plate for electrolysis - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial application field" The present invention relates to an electrolysis method for forming a thin copper plate as a seed plate for refining blister copper on the surface of a base plate, for example, in electrolytic refining of copper. The present invention relates to a cathode plate for electrolysis and a cathode plate for electrolysis for directly electrodepositing high-purity copper by omitting a seed plate process.

[Background Art] For example, as a base plate of a cathode plate used for electrolytic refining of copper, a plate using a rolled copper base plate has been conventionally known. In electrolytic refining, after a copper thin plate is electrodeposited on a copper base plate to which a release agent has been applied in advance, the thin plate is separated and finished to be smooth, thereby forming a seed plate for refining blister copper.

However, in addition to the necessity of applying a release agent, the copper base plate is rapidly corroded in the vicinity of the electrolyte solution surface, and is rapidly worn or deformed during repeated peeling of the seed plate. However, there is a problem that the service life is short.

For this reason, more factories worldwide use titanium (Ti) plates as mother plates, and in recent years stainless steel mother plates have been used due to economical efficiency. Then, some factories have come to adopt a method in which high-purity copper is directly electrodeposited with a thickness of several mm on the stainless steel base plate and then peeled off to obtain product copper.

The following is an example of the configuration of a cathode plate having a stainless steel base plate.
This is shown in FIGS.

In these figures, reference numeral 1 denotes a hanger bar, and the hanger bar 1 uses a cold-worked copper strip having a small potential resistance and a large mechanical strength. A flat motherboard 2 is suspended from the hanger bar 1 along its longitudinal direction. The mother plate 2 is made of stainless steel, and ear plates 3 also made of stainless steel protrude upward from both left and right ends of the upper side. The ear plate 3 is provided with bolts 4 on the hanger bar 1,
It is fixed by a nut 5 and connected to the hanger bar 1 by solder 6 welded to the hanger bar 1. Due to the solder 6, the contact resistance between the hanger bar 1 and the ear plate 3 is reduced. Here, the reason why the hanger bar 1 and the ear plate 2 are connected with the solder 6 without welding is to prevent the work-hardened hanger bar 1 from being annealed by heat and reducing the strength. To do that. In addition, a stainless steel ear plate 3 and a copper hanger bar 1
This is because, as is generally known, intergranular corrosion cracking of stainless steel occurs when welding is performed with the prior art.

In the cathode plate for electrolysis configured as described above, both ends in the longitudinal direction of the hanger bar 1 are supported by the cathode terminals of the power supply source, and the mother plate 2 is suspended in the electrolyte bath. Then, electricity flows from the blister copper plate on the anode terminal side suspended in parallel with the mother plate 2 to the mother plate 2, and copper is deposited on the plate surface of the mother plate 2.

[Problems to be Solved by the Invention] However, in the cathode plate for electrolysis, since the hanger bar 1 is formed of copper, the hanger bar 1 is easily bent, and the distance between the poles of the blister plate suspended in parallel is accurately adjusted. It is practically difficult to do so, and the head gap of the bolt 4 or the nut 5 is protruded and the bend of the hanger bar 1 is restricted, so that the distance between the poles cannot be reduced, and the seed plate cannot be efficiently laid. Cannot be manufactured. In addition, since the electrolyte penetrates into the solder 6 connecting the hanger bar 1 and the ear wire 3 to form a nonconductive compound, the contact resistance between the hanger bar 1 and the ear plate 3 increases, and the power consumption increases. Further, there is a problem that the distribution of the current flowing through this portion becomes non-uniform, so that the thickness of the seed plate also becomes non-uniform. Therefore, when the hanger bar 1 and the ear plate 3 are welded, as described above, the hanger bar 1 is annealed by heat, and the strength is reduced. In addition, when the stainless steel ear plate 3 and the copper hanger bar 1 are welded, there is a problem that, as is generally known, intergranular corrosion cracking occurs in the stainless steel.

An object of the present invention is to solve the above problems.

"Means for Solving the Problems" The present invention provides a hanger bar covered with a copper coating layer except for a welding area on the outer periphery of an iron mandrel, and a stainless steel steel bar along the longitudinal direction of the hanger bar. A cathode plate for electrolysis welded in such a manner that the mother plate is hung, wherein a part of the welding area of the mandrel and the mother plate are mainly composed of iron.
The first welding portion and the coating layer are joined at a first welding portion using a welding material to which Ni and Cr are added, and the welding portion containing copper is used at the remaining portion of the welding region. It is joined at the second welded portion.

[Operation] In the present invention, a current flows between the hanger bar and the mother plate through the first welded portion and the second welded portion.
Further, the current flowing through the hanger bar passes through the outer copper coating layer having low electric resistance.

“Embodiment” An embodiment of the present invention will be described with reference to FIGS.

In FIG. 1, reference numeral 11 denotes a hanger bar. As shown in FIG. 4, the hanger bar 11 is wound around a mandrel 11a having a square cross section made of SS41 (JIS) and an outer periphery of the mandrel 11a. And a copper coating layer 11b. A mother plate 12 is fixed to the lower side surface of the hanger bar 11 so as to be suspended along the center line thereof.

As shown in FIG. 1, the base plate 12 is made of SUS304L (JIS) stainless steel and formed in a rectangular flat plate shape, and protrudes upward at both left and right ends of the upper side of the base plate 12. A rectangular ear plate 13 is welded. As shown in FIG. 4, the ear plate 13 is formed of SUS316L (JIS) stainless steel and is formed to be slightly thicker than the mother plate 12, so that corrosion resistance and mechanical strength are improved. Moreover,
The stress concentration at the weld is reduced. The mother plate 12 and the ear plate 13 are, for example, Y316L (JIS Z 332
Dig welding with the welding rod of 1), the mother plate 12 and the ear plate 13
Are joined by a welded portion 14 welded to the base member. The upper end of the left and right ear plates 13 of the mother plate thus formed is fixed to the hanger bar 11 by welding.

The coating layer 11b of the hanger bar 11 has the structure shown in FIGS.
As shown in the figure, an elongated hole 11c for welding the upper end of the ear plate 13 to the mandrel 11a is formed. This slot 11c
The hanger bar 11 is formed to be elongated along the center line of the lower side surface, and the upper end of the ear plate 13 is freely inserted. The upper end of the ear plate 13 is
A is welded along the center line of the lower surface of a and is welded all around, and is joined to the mandrel 11a by a first welded portion 15 welded to the ear plate 13 and the mandrel 11a. This welding is performed by, for example, dig welding using a welding rod of Y312 (JIS Z 3321). Further, the first welded portion 15 and the side wall of the elongated hole 11c are welded by dig welding using, for example, a YCu (JIS Z 3341) welding rod, and are welded to the coating layer 11b, the mandrel 11a and the first welded portion 15. Are joined by a second welding portion 16.

Reference numeral 17 denotes a resin protector for insulating the outer sides of the mother plate 12 and the ear plate 13.
17 is adapted to be detachably fitted to the outer side.

In the cathode plate for electrolysis configured as described above, both ends of the hanger bar 11 are supported by the cathode terminals, and the mother plate 12 is suspended in the electrolyte bath. At this time, the mother plate 12 is brought closer to the blister plate suspended in parallel with the mother plate 12 on the anode terminal side. In this state, when an electric current is applied to each of the terminals, an electric current flows from the crude copper plate side to the mother plate 12 through the electrolytic solution, and copper is deposited on the surface of the mother plate 12. The current flowing through the mother plate 12 further flows through the ear plate 13, the first welded portion 15, the second welded portion 16, and the hanger bar 11 to the cathode terminal. The current flowing through the hanger bar 11 flows to the cathode terminal through the coating layer 11b having a particularly low electric resistance.

In the cathode plate for electrolysis configured as described above, since the mandrel 11a of the hanger bar 11 is formed of SS41, the rigidity is large, and both ends of the hanger bar 11 are supported by the cathode terminals, and the base plate 12 is formed. Even in the suspended state, the deflection of the hanger bar 11 can be kept extremely small, and the hanger bar 11 can be maintained in a state of less bending for a long period of time. For this reason, the gap between the blister plate suspended in parallel can be accurately adjusted, and the gap between the blister plate and the hanger bar 11 can be reduced by the straightness as compared with the conventional example. And the production of the seed plate can be performed efficiently. In addition, the rigidity of the hanger bar 11 is large, so that the dimension of the base plate 12 of the hanger bar 11 in the thickness direction can be reduced, and bolts and nuts for fixing the hanger bar 11 to the ear plate 13 are required. Since it is not provided, the gap between the blister plate and the copper plate can be further reduced. Further, since it is clear that the mechanical strength of the welded portion can be sufficiently obtained in the welding of the SS41 material and the SUS316L material, the mandrel 11a and the ear plate 13 are firmly joined at the first welded portion 15. can do. Further, the current flowing to the mother plate 12 flows to the hanger bar 11 through the ear plate 13, the first welded portion 15, and the second welded portion 16, so that the hanger bar 11 and the mother plate
The contact resistance between the hanger bar 11 and the base plate 12 can be made uniform, and the distribution of the current flowing between the hanger bar 11 and the base plate 12 can be made uniform. The thickness of the seed plate can be made uniform. Moreover, since the ear plate 13 and the mandrel 11a are firmly connected to each other at the first welded portion 15, the weight of the mother plate 12 is hardly added to the second welded portion 16, and the second welded portion Even when the mechanical properties of 16 are unstable, the properties of second welded portion 16 can be maintained in a stable state for a long period of time. Therefore, the state where the contact resistance is extremely small and the state where the current distribution is uniform can be maintained for a long time. Furthermore, since the upper end of the ear plate 13 is welded to the elongated hole 11c of the hanger bar 11 in a state of being inserted, the connection strength and the verticality between the hanger bar 11 and the ear plate 11c can be improved.

In the above embodiment, SS41 is used as the material of the mandrel 11a, but iron such as other structural carbon steel or stainless steel may be used.

Further, although the hanger bar 11 has a configuration in which the coating layer is wound around the mandrel 11a, the hanger bar 11 may be configured as a clad material in which the coating layer is adhered to the mandrel.

Further, the ear plate 11c is formed to be thicker than the mother plate 12, and the material is different from that of the mother plate 12, but the ear plate 11c is integrally formed with the same material and the same thickness as the mother plate 12. May be.

[Effects of the Invention] As described above, according to the present invention, since the mandrel of the hanger bar is formed of iron, the hanger bar has high rigidity and both ends of the hanger bar are supported by the cathode terminals to suspend the mother plate. Even when the hanger bar is lowered, the deflection of the hanger bar can be kept extremely small, and the hanger bar can be maintained in a state of less bending for a long period of time. For this reason, it is possible to accurately adjust the gap between the blister copper plate suspended in parallel and the hanger bar is straight,
Compared with the conventional example, the distance between the blister plate and the gap can be narrowed, and the production of the seed plate can be performed efficiently. In addition, since the hanger bar has high rigidity, the dimension of the hanger bar in the thickness direction of the mother plate can be reduced, and bolts and nuts for fixing the hanger bar to the mother plate are not required. However, the distance between the pole and the blister copper plate can be further reduced. Further, since it is clear that the mechanical strength of the welded portion can be sufficiently obtained in the welding of iron and stainless steel, the mandrel and the base plate can be firmly joined at the first welded portion. The current flowing to the mother board is
Since the current flows to the hanger bar through the first welded portion and the second welded portion, the contact resistance between the hanger bar and the base plate is extremely reduced, and the current flowing between the hanger bar and the base plate is reduced. Distribution becomes uniform, and the thickness of the seed plate electrodeposited on the plate surface of the bus bar becomes uniform. In addition, since the mother plate and the mandrel are firmly connected to each other at the first adhesive portion, the weight of the mother plate is hardly added to the second welded portion, and the mechanical properties of the second welded portion are reduced. Is stable, the properties of the second welded portion can be maintained in a stable state for a long time. Therefore, the state where the contact resistance is extremely small and the state where the current distribution is uniform can be maintained for a long time.

[Brief description of the drawings]

1 to 4 are views showing an embodiment of the present invention. FIG. 1 is a front view of an electrolytic cathode plate, FIG. 2 is a side view of the electrolytic cathode plate, and FIG. FIG. 4 is a view showing a long hole of a coating layer,
The figure is a sectional view taken along the line IV-IV in FIG.
FIG. 5 is a view showing a conventional example, FIG. 5 is a front view of an electrolytic cathode plate, and FIG. 6 is a view taken in the direction of arrow VI in FIG. 11 ... hanger bar, 11a ... mandrel, 11b ... coating layer, 12 ... mother plate, 15 ... first welded part, 16 ... second welded part.

Claims (1)

(57) [Claims] 1. A hanger bar (11) covered with a copper coating layer (11b) except for a welding area (11c) in an outer periphery of an iron mandrel (11a). A cathode plate for electrolysis welded so that a stainless steel base plate (12) is suspended along a direction, and a part of the welding area (11c) of the mandrel (11a) and the base plate. (12) are joined at a first welded portion (15) using a welding material containing iron as a main component and Ni and Cr added, and the first welded portion (15) and the coating layer (11b) are joined together. Are connected at a second welded portion (16) using a welding material containing copper in a remaining portion of the welding region (11c).