TWI412628B - Gold or silver electrolytic recovery unit - Google Patents

Abstract

An electrolytic recovery device for gold or silver is constituted so that gold or silver electroplated onto cathodes can be easily stripped off so that a barrel cathode (3) can be repeatedly used. An electrolytic recovery device for gold or silver, which comprises an electrolysis layer (1), a control device (2), anode (4), and barrel cathode (3), is constituted so that an insulating cap is fitted onto the entire circumference of a lower edge, a plurality of strip-shaped insulators are detachably applied with gaps provided therebetween in the longitudinal direction at one location of the outer circumferential surface of the barrel cathode (3), and electroplated gold or silver can be thereby easily stripped off from the barrel cathode by removing the strip-shaped insulators.

Description

Gold or silver electrolysis recovery unit Technical field

The present invention relates to a device for electrolytically recovering gold from a solution containing gold and a device for electrolytically recovering silver from a solution containing silver, and more particularly to a device which can be easily peeled off from a cathode by a cathode. Gold or silver gold or silver electrolytic recovery unit.

Background technique

A method for recovering gold from a waste liquid containing gold generated when a gold plating solution or an electronic component is recovered is an electrolytic method, and silver is recovered from a waste liquid containing silver such as a silver plating solution or a photo fixing liquid. The method is also widely practiced by electrolysis.

As an apparatus for electrolytically recovering a solution containing silver, for example, a silver recovery apparatus including an electrolytic cell, an anode disposed in the electrolytic cell, and a removable portion disposed around the anode and disposed in the electrolytic cell are known. a cathode; and an electrical connector disposed on the outside of the electrolytic cell for the cathode and the anode, and the electrolytic cell includes a conductive contact surface, and the deformable portion of the cathode is held relative to the contact surface for connection by a cathode Electrical connection to the cathode. (for example, refer to Patent Document 1)

Further, as an apparatus for electrolytically recovering a solution containing silver, for example, a silver electrolysis recovery apparatus including an electrolytic cell, an anode disposed in the electrolytic cell, a reference electrode located in the cell, and a groove are known. The separable connection cathode (the cathode has an inner surface opposite to the anode and opposite to the outer surface of the reference electrode); a mechanism for suppressing silver deposition outside the cathode. (for example, refer to Patent Document 2)

Further, as a device for electrolytically recovering gold from a gold-containing solution such as a gold plating waste liquid, there has been disclosed, for example, a device for electrolytically recovering gold from a gold plating waste liquid and a gold plating washing water using a rotating cathode made of Ti. . In the apparatus, the method of preventing peeling off of the electroplated gold is characterized in that the oxide film is removed by hydrofluoric acid or hydrochloric acid or nitric acid in the surface of the rotating electrode. (for example, refer to Patent Document 3)

Further, a cyanide waste liquid containing a valuable metal such as gold is supplied to the electrolytic cell, and an insoluble material is used for the anode, and while the cathode plate is rotated, electrolysis is performed to deposit a valuable metal such as gold on the surface of the cathode plate, and the cyanide-containing waste liquid is recovered. Recovery devices for valuable metals are known. (for example, refer to Patent Document 4)

However, in the electrolytic recovery apparatus using such a cylindrical cathode disclosed in Patent Document 1 and Patent Document 2, since the cathode material itself is thin and a plurality of slits are provided at the upper edge, the mounting and removal of the electrolytic cell are performed. It takes a lot of time.

Further, sometimes the precipitated silver is peeled off from the cathode, so that the anode and the cathode are short-circuited, and the consumption of the anode is promoted, so that the electrolysis cannot be continued.

Further, the noble metal electrolytic recovery device of Patent Document 3 is considered to be in close contact with the Ti rotating electrode without peeling off, but the noble metal plated on the Ti rotating electrode is spread over the entire surface of the electrode, and is adhered from the upper end to the lower end. Even if the noble metal is peeled off from the Ti rotating electrode by using a doctor blade or a hammer in order to reuse the Ti rotating electrode, the problem of being easily peeled off is not obtained.

Moreover, the valuable metal recovery apparatus disclosed in the above-mentioned Patent Document 4 is different from the electrolytic recovery apparatus of the present invention in that a cylindrical shape is used as a cathode and a disk shape is used.

Since the disk-shaped cathode is thickly plated with precious metals such as gold and silver to both the surface and the inside, there is a problem that the noble metal cannot be easily peeled off even if the noble metal is peeled off from the cathode by using a doctor blade or a hammer.

Prior technical literature

Patent literature

[Patent Document 1] JP-A-6-240483

[Patent Document 2] Japanese Patent Publication No. 8-92782

[Patent Document 3] Japanese Patent Publication No. 11-92985

Patent Document 4: Japanese Patent Publication No. 10-18074

SUMMARY OF THE INVENTION An object of the present invention is to provide an improved gold or silver electrolysis recovery apparatus which can easily strip gold or silver plated on a cathode in an electrolytic recovery apparatus using gold or silver in a cylindrical rotating cathode such as stainless steel or titanium. In order to reuse the cylindrical rotating cathode.

The inventors of the present invention have completed the following invention in order to solve the above problems.

That is, the present invention is

(1) An electrolytic recovery apparatus for gold or silver, which is an electrolytic recovery apparatus for gold or silver composed of an electrolytic layer, a control device, an anode, and a cylindrical cathode, wherein the cylindrical cathode is entirely on the lower edge portion. The circumferentially fitting insulating cover is provided with a gap in the longitudinal direction at a position of the outer peripheral surface of the cylindrical cathode, and a plurality of strip-shaped insulators can be connected and detachably attached, and the strip-shaped insulator can be easily removed by the cylindrical cathode by removing the strip-shaped insulator. Gold or silver plating.

(2) The gold or silver electrolysis apparatus according to (1) above, wherein the upper portion of the cylindrical cathode is a lid having a vent hole.

(3) The electrolytic recovery apparatus for gold or silver according to any one of the above (1) or (2), wherein the insulating cover and the strip-shaped insulating material are synthetic resin or rubber.

(4) The electrolytic recovery apparatus for gold or silver according to any one of the above (1) to (3), characterized in that the strip-shaped insulating material is freely connected to the outer peripheral surface of the cylindrical cathode by a screw. The position is in the longitudinal direction.

(5) An electrolytic recovery apparatus for gold or silver according to any one of the above (1) to (4), characterized in that the anode is disposed outside the cylindrical cathode in the electrolytic bath.

(6) An electrolytic recovery apparatus for gold or silver according to any one of the above (1) to (5), characterized in that the gold or silver plated on the surface of the cylindrical cathode is configured to be capable of removing the strip insulation The screw of the material is stripped of the strip-shaped insulating material and peeled off in a cylindrical shape.

According to the present invention, it is possible to easily remove the gold or silver precipitated from the cylindrical cathode by the electrolytic recovery liquid of gold or silver by using a specially processed cylindrical cathode. Further, the cylindrical cathode after stripping recovery of gold or silver can be reused.

Simple description of the schema

Fig. 1 is a perspective view showing an embodiment of the silver electrolysis recovery apparatus of the present invention.

Fig. 2 is a perspective view of a cylindrical cathode of the electrolytic recovery apparatus of Fig. 1.

Fig. 3 is a perspective view showing a state in which the cylindrical cathode of the electrolytic recovery device of Fig. 1 is reversed.

Figure 4 is a perspective view of electrolytic silver stripped from the cathode.

The best form for implementing the invention

The invention will be described in detail below with reference to the drawings.

[Example 1]

First, the case of recovering electrolytic silver using the gold or silver electrolytic recovery apparatus of the present invention will be described.

Fig. 1 is a perspective view of a silver electrolytic recovery apparatus of the present invention, and Fig. 2 is a perspective view of a cylindrical cathode of the electrolytic recovery apparatus of Fig. 1. In consideration of workability, economy, and the like, the cylindrical cathode 3 is a size having a diameter of 250 mm and a height of 370 mm.

As shown in Fig. 1 and Fig. 2, the electrolytic cell 1 is integrated with the control device 2, and the control device 2 performs current control. In the inner central portion of the electrolytic cell 1, the cylindrical cathode 3 is fixed to the cathode fixing rod 10 by screws 13, and is rotated about the cathode fixing rod 10 fixed to the electrolytic cell 1. After the completion of the precipitation of silver, the cylindrical cathode 3 can be easily removed from the electrolytic cell 1 by means of the removing screw 13. Further, the anode 4 is provided opposite to the outer circumference of the cylindrical cathode 3. Here, as shown in Fig. 1, four anodes 4 surrounding the four sides of the cylindrical cathode 3 are disposed.

In the present invention, the main features include that the silver deposited on the cylindrical cathode 3 can be easily peeled off, and the cylindrical cathode 3 is processed so as not to be peeled off by the cathode during electrolysis.

That is, the cylindrical cathode 3 in the silver electrolysis recovery apparatus of the present invention is covered with the lid 11 as shown in Fig. 2 . Further, a plurality of vent holes 12 are provided in the cover 11, and a central portion is provided with an opening portion fixed to the cathode fixing rod 10 by a screw 13.

As shown in Fig. 3, the lower surface of the cylindrical cathode 3 has no opening to form an opening, and the insulating cover 7 is fitted to the entire periphery of the lower edge portion of the cylindrical cathode 3.

On the other hand, at a position in the longitudinal direction of the outer peripheral surface 5 of the cylindrical cathode 3, a plurality of gaps 8 are fixed by screws 9 and the separated strip-shaped insulating material 6 can be connected.

When the strip-shaped insulating material 6 is continuously attached without a gap, the precipitated silver is peeled off from the cathode by the strip-shaped insulating material 6 and falls off during the electrolysis. Therefore, it is important to provide the gap 8 . That is, the gap 8 is a gap which prevents the silver deposited on the periphery of the cylindrical cathode 3 from being peeled off. In Embodiment 1, the gap 8 is located at a position, but may be disposed at a plurality of positions. The preferred range of the gap 8 is 1 mm to 10 mm, and more preferably 3 to 7 mm. When it is 1 mm or less, it peels off in the middle of electrolysis, and it is unpreferable. When it is 10 mm or more, it takes a lot of time for peeling work, and it is unpreferable.

In the present invention, the material constituting the cylindrical cathode 3 may, for example, be titanium or stainless steel. Further, the material constituting the anode may be, for example, a platinum-plated platinum or a platinum alloy.

In the present invention, in order to easily peel off the silver deposited on the cylindrical cathode 3, the insulating cover 7 and the strip-shaped insulating material 6 which are provided in the cylindrical cathode 3 may be made of, for example, polyethylene, polypropylene or polycarbonate. Synthetic resins such as esters, nylons and polyesters; rubbers such as natural rubber, polyurethane rubber, nitrile rubber and silicone rubber.

Next, the silver electrolysis recovery apparatus of the present invention will be described, and silver is recovered from a waste liquid containing silver. The waste liquid of the object to be recovered is mainly a silver plating solution which is discharged from the factory, or a liquid which is dissolved and stripped of silver by an electronic component or the like.

First, an insulating cover 7 made of polyethylene is fitted over the entire lower edge of the cylindrical cathode 3, and the same polyethylene strip-shaped insulating material 6 is fixed to the outer peripheral surface 5 of the cylindrical cathode 3 by screws 9. The longitudinal position of the two places. At this time, the strip-shaped insulating material 6 is provided with a gap 8 of 5 mm as shown in Fig. 2 so as not to be joined together, and the cylindrical cathode 3 thus prepared is attached to the cathode fixing rod 10 by screws 13.

Then, the silver recovery waste liquid 14 is filled into the electrolytic cell 1, and is supplied to the power source of the control device 2, and is deposited into the cylindrical cathode 3 by electrolysis of the silver contained in the waste liquid. As a result, the electrolytic silver is deposited out of the gap 8, Therefore, the electrolytic silver separated by the polyethylene strip-shaped insulating material 6 is separated from the electrolytic silver by the portion of the gap 8, so that the silver is not peeled off or detached from the cathode.

The cylindrical cathode 3 is taken out from the electrolytic cell 1, and the screw 9 of the strip-shaped insulating material 6 is removed, and the strip-shaped insulating material 6 is removed, whereby the deposited electrolytic silver 16 can be easily peeled off from the cylindrical cathode 3, as described in Figure 4 shows. In Fig. 4, the segmented portion 17 of the stripped electrolytic silver 16 which is partially cut by the gap 8 (electrolyzed silver deposited in the gap portion) is shown.

[Example 2]

Example 2 is an example of an electrolytic recovery apparatus for gold. The description of the silver electrolysis recovery apparatus of the first embodiment can also be applied to the gold electrolysis recovery apparatus, and therefore, only the silver in the description can be changed to gold. Therefore, in order to avoid repeated description, the above description is omitted here.

Industrial availability

The gold or silver electrolysis recovery device of the present invention can use a specially processed cylindrical cathode, and the electrolytic recovery liquid of gold or silver can be easily stripped and recovered from gold or silver precipitated from the cylindrical cathode, and can be efficiently and efficiently Recycling gold or silver has great industrial availability. Further, since the cylindrical cathode after stripping of gold or silver can be reused and reused, industrial availability is also large in terms of material saving.

1. . . Electrolytic cell

2. . . Control device

3. . . Cylindrical cathode

4. . . anode

5. . . Peripheral surface

6. . . Ribbon insulation

7. . . Insulating cover

8. . . gap

9. . . Screw

10. . . Cathode fixed rod

11‧‧‧ Cover

12‧‧‧ venting holes

13‧‧‧ screws

15‧‧‧Silver recycling waste

16‧‧‧electrolytic silver

17‧‧‧ Fragment Department

Fig. 1 is a perspective view showing an embodiment of the silver electrolysis recovery apparatus of the present invention.

Fig. 2 is a perspective view of a cylindrical cathode of the electrolytic recovery apparatus of Fig. 1.

Fig. 3 is a perspective view showing a state in which the cylindrical cathode of the electrolytic recovery device of Fig. 1 is reversed.

Figure 4 is a perspective view of electrolytic silver stripped from the cathode.

1. . . Electrolytic cell

2. . . Control device

3. . . Cylindrical cathode

4. . . anode

15. . . Silver recycling waste

Claims (17)

The invention relates to a gold or silver electrolysis recovery device, which is an electrolytic recovery device for gold or silver composed of an electrolytic cell, a current control device, an anode and a cylindrical cathode, wherein the cylindrical cathode is on the lower edge portion. The insulating cover is fitted over the entire circumference, and a plurality of strip-shaped insulating materials are provided with a gap of 1 mm to 10 mm in the longitudinal direction of the cylindrical cathode, and are detachably attached to a peripheral surface of the cylindrical cathode. In the longitudinal direction, the plated insulator is removed and the electroplated gold or silver can be easily peeled off from the cylindrical cathode. An electrolytic recovery apparatus for gold or silver according to item 1 of the patent application, wherein the upper portion of the cylindrical cathode is a cover having a vent hole. For example, in the gold or silver electrolytic recovery device of claim 1, wherein the insulating cover and the strip insulating material are synthetic resin or rubber. For example, in the gold or silver electrolytic recovery device of claim 2, wherein the insulating cover and the strip insulating material are synthetic resin or rubber. An electrolytic recovery apparatus for gold or silver according to the first aspect of the patent application, wherein the strip-shaped insulating material is freely connected to the longitudinal direction at a position on the outer peripheral surface of the cylindrical cathode by means of a screw. An electrolytic recovery apparatus for gold or silver according to item 2 of the patent application, wherein the strip-shaped insulating material is freely connected by a screw to be mounted in a longitudinal direction at a position on the outer peripheral surface of the cylindrical cathode. An electrolytic recovery apparatus for gold or silver according to item 3 of the patent application, wherein the strip-shaped insulating material is freely connected to the longitudinal direction at a position on the outer peripheral surface of the cylindrical cathode by means of a screw. An electrolytic recovery apparatus for gold or silver according to item 4 of the patent application, wherein the strip-shaped insulating material is freely connected by a screw to be mounted in a longitudinal direction at a position on the outer peripheral surface of the cylindrical cathode. An electrolytic recovery apparatus for gold or silver according to the first aspect of the invention, wherein an anode is disposed outside the cylindrical cathode in the electrolytic cell. An electrolytic recovery apparatus for gold or silver according to item 2 of the patent application, wherein an anode is disposed outside the cylindrical cathode in the electrolytic cell. An electrolytic recovery apparatus for gold or silver according to item 3 of the patent application, wherein an anode is disposed outside the cylindrical cathode in the electrolytic cell. An electrolytic recovery apparatus for gold or silver according to item 4 of the patent application, wherein an anode is disposed outside the cylindrical cathode in the electrolytic cell. An electrolytic recovery apparatus for gold or silver according to item 5 of the patent application, wherein an anode is disposed outside the cylindrical cathode in the electrolytic cell. An electrolytic recovery apparatus for gold or silver according to item 6 of the patent application, wherein an anode is disposed outside the cylindrical cathode in the electrolytic cell. An electrolytic recovery apparatus for gold or silver according to item 7 of the patent application, wherein an anode is disposed outside the cylindrical cathode in the electrolytic cell. An electrolytic recovery apparatus for gold or silver according to item 8 of the patent application, wherein an anode is disposed outside the cylindrical cathode in the electrolytic cell. The gold or silver electrolytic recovery device according to any one of claims 1 to 16, wherein the gold or silver plated on the surface of the cylindrical cathode is configured to remove the screw of the strip-shaped insulating material and move Stripped in a cylindrical shape except for a strip-shaped insulating material.