Precious metal ion exchanger

Abstract

The utility model discloses a precious metal ion exchanger capable of automatically supplementing silver potassium cyanide to an electroplating bath. According to the technical scheme, the ion exchange tank comprises an ion exchange tank, a first anode and a first cathode, the first anode and the first cathode are arranged in the ion exchange tank, the first anode is connected to a power supply anode of a first high-frequency rectifier, and the first cathode is connected to a power supply cathode of the first high-frequency rectifier. A group of movable ion selective permeable membrane cylinders are arranged in the ion exchange tank through a support, a KOH solution is contained in the ion selective permeable membrane cylinders, the first cathode is arranged in the ion selective permeable membrane cylinders, at least part of the first cathode is immersed in the KOH solution, an electroplating solution is contained in the ion exchange tank, and the second cathode is arranged in the ion selective permeable membrane cylinders and is at least partially immersed in the KOH solution. And at least part of the first anode is immersed in the electroplating liquid.

Description

Technical Field

[0001] The utility model belongs to the field of electroplating, and in particular relates to an electroplating device. Background Art

[0002] The structure of the traditional electroplating production line includes: an electroplating tank and an anode and a cathode located above the electroplating tank. The anode is connected to the positive pole of the high-frequency rectifier power supply, and the cathode is connected to the negative pole of the high-frequency rectifier power supply. The electroplating tank contains electroplating solution. Take silver plating as an example: in traditional electroplating, the staff first calculates the working current of the high-frequency rectifier according to the volume of the electroplated workpiece, and then hangs the electroplated workpiece on the cathode. At the same time, it is also necessary to hang a silver plate on the anode to ensure the conductive area of ​​the anode and the replenishment of silver ions to the electroplating solution. The disadvantages of traditional electroplating production lines are: 1. During the electroplating process, the silver plate will be gradually consumed and become smaller, making the conductive area of ​​the anode plate smaller. The too small conductive area will lead to an increase in voltage and a decrease in current efficiency, which will lead to a decrease in production efficiency and passivation of the anode; 2. During the electroplating process, the silver ions in the electroplating solution will be continuously consumed, and with the consumption of the silver plate in the anode, the silver ions in the electroplating solution will be insufficient. Therefore, during the electroplating process, potassium silver cyanide needs to be added frequently to keep the concentration of silver ions in the electroplating solution within a certain range, which is not only troublesome to operate, but also difficult to achieve consistency in the quality of the electroplated workpiece; 3. In order to ensure the area of ​​the anode plate, a large number of silver plates need to be put in (for example, a 7000L electroplating tank needs to hang 200KG or more silver plates during normal production, but the daily consumption is only about 10KG), which brings greater cost pressure and capital retention to the production enterprises; 4. The uneven distribution of silver ions will cause the electroplating layer of the electroplated workpiece close to the silver plate to be thicker than the electroplating layer of the electroplated workpiece far away from the silver plate. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a noble metal ion exchanger which can automatically supplement potassium silver cyanide to an electroplating tank.

[0004] In order to solve the above problems, the technical solution adopted by the utility model includes: an ion exchange tank and a first anode and a first cathode arranged in the ion exchange tank, characterized in that: the first anode is connected to the positive pole of the power supply of the first high-frequency rectifier, the first cathode is connected to the negative pole of the power supply of the first high-frequency rectifier, a group of movable ion selective permeable membrane cylinders are arranged in the ion exchange tank through a bracket, the ion selective permeable membrane cylinder contains KOH solution, the first cathode is arranged in the ion selective permeable membrane cylinder and is at least partially immersed in the KOH solution, the ion exchange tank contains electroplating solution, and the first anode is at least partially immersed in the electroplating solution.

[0005] The noble metal ion exchanger is characterized in that: the first anode includes a first anode main electrode, titanium blue hung on the first anode main electrode, and a noble metal plate placed in the titanium blue, and is connected to the positive pole of the power supply of the first high-frequency rectifier through the first anode main electrode, and the titanium blue and the noble metal plate are immersed in the electroplating solution.

[0006] The noble metal ion exchanger is characterized in that the first cathode includes a stainless steel rod and a cathode main electrode connected to the top of the stainless steel rod, and is connected to the negative pole of the power supply of the first high-frequency rectifier through the cathode main electrode.

[0007] The noble metal ion exchanger is characterized in that a KOH solution replenishing tank is provided next to the ion exchange tank, and the KOH solution replenishing tank replenishes the KOH solution for the ion selective permeable membrane cartridge through a cathode circulation pipeline and a cathode circulation pump.

[0008] The noble metal ion exchanger is characterized in that a group of mounting holes are provided on the bracket, and the ion selective permeable membrane cartridge is movably arranged in the mounting holes.

[0009] The noble metal ion exchanger is characterized in that a handle is provided on the titanium blue.

[0010] The noble metal ion exchanger is characterized in that the noble metal plate is a silver plate.

[0011] The precious metal ion exchanger is characterized in that it also includes a PLC controller and a current detection device, wherein the current detection device is used to detect the high-frequency current value on the electroplating tank and transmit it to the PLC controller, and the PLC controller sets the working current value of the first high-frequency rectifier according to the high-frequency current value.

[0012] Advantages of the precious metal ion exchanger, electroplating production line and electroplating process of the utility model:

[0013] 1. During the electroplating process, potassium silver cyanide is automatically added to the electroplating tank through the precious metal ion exchanger, so that the silver plate in the anode of the electroplating tank can be eliminated and replaced by a stainless steel plate, so that the area of ​​the anode plate will not be reduced, providing favorable conditions for stable current for electroplating, so that the voltage will not increase due to the small anode area, the current efficiency will be reduced, the production speed will not be reduced, and the production progress will not be affected or the anode passivation phenomenon will occur; 2. There is no need to add potassium silver cyanide frequently manually, which simplifies the operation. Since the exchanger automatically adds potassium silver cyanide in real time, and the electroplating solution is circulated, the silver ions are more evenly distributed, so that the consistency of the quality of the electroplated workpiece is better; 3. Only the actual amount of silver plates consumed need to be put into the precious metal ion exchanger, which can reduce the cost investment and capital retention of the production enterprise; 4. The KOH solution and the cathode stainless steel rod are placed in the ion selective permeable membrane cylinder, and the ion selective permeable membrane cylinder is movably set in the mounting hole of the bracket, so that the expansion performance of the cathode is better.

[0014] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model precious metal ion exchanger;

[0016] Figure 2 It is a top view of the ion exchange tank of the utility model;

[0017] Figure 3 It is a structural schematic diagram of the electroplating production line of the utility model. DETAILED DESCRIPTION

[0018] like Figure 1 to Figure 2As shown, the precious metal ion exchanger of the utility model comprises an ion exchange tank 1 and a first anode 2 and a first cathode 3 arranged in the ion exchange tank 1. The first anode 2 is connected to the positive pole of the power supply of the first high-frequency rectifier 4, and the first cathode 3 is connected to the negative pole of the power supply of the first high-frequency rectifier 4. A group of ion selective permeable membrane cartridges 6 are arranged in the ion exchange tank 1 through a bracket 5, and the ion selective permeable membrane cartridge 6 contains KOH solution (potassium hydroxide solution), the first cathode 3 is arranged in the ion selective permeable membrane cartridge 6, and the first cathode 3 is immersed in the KOH solution, and the ion exchange tank 1 contains electroplating solution (main components include main salt, conductive salt, anode active agent, buffer and additive), and the first anode 2 is immersed in the electroplating solution. The ion selective permeable membrane cartridge 6 is a cylindrical structure made of an ion selective permeable membrane. The ion selective permeable membrane is a thin film with a specific pore size and spatial structure. It uses the principle of ion selective permeation to allow specific types of ions to pass through and block the transmission of other ions. It is a known material commonly used in the field of electroplating. The first anode 2 includes a first anode main electrode 7, titanium blue 8 hanging on the first anode main electrode 7, and a precious metal plate 9 placed in the titanium blue 8. The first anode main electrode 7 is connected to the positive pole of the power supply of the first high-frequency rectifier 4, and the titanium blue 8 and the precious metal plate 9 are immersed in the electroplating solution. The titanium blue 8 refers to the titanium electrode material, which is mainly made of high-quality TA2 industrial pure titanium. The purity of titanium reaches 99.7%, has strong corrosion resistance, and is suitable for loading anode materials in various electroplating tanks. When silver plating, the precious metal plate 9 is a silver plate. The first cathode 3 includes a stainless steel rod 10 and a cathode main electrode 11 connected to the top of the stainless steel rod 10. The plurality of stainless steel rods 10 are connected in series through the cathode main electrode 11, and finally the end of the cathode main electrode 11 is connected to the negative pole of the power supply of the first high-frequency rectifier 4. The noble metal ion exchanger of the above structure can continuously electrolyze and synthesize to generate the main salt - potassium silver cyanide, and can be used to continuously and automatically replenish the noble metal ions consumed in the electroplating tank, so that the noble metal ion concentration in the electroplating solution reaches the required optimal process range.

[0019] Preferably, a KOH solution replenishing tank 12 is provided next to the ion exchange tank 1, and the KOH solution replenishing tank 12 replenishes the ion selective permeable membrane cartridge 6 with KOH solution through the negative electrode circulation pipeline 13 and the negative electrode circulation pump 14, so as to ensure that the concentration of the KOH solution meets the requirements.

[0020] Preferably, the support 5 is provided with a group of mounting holes 15, and the ion selective permeable membrane cartridge 6 is movably arranged in the mounting holes 15. The above structure facilitates the installation and expansion of the ion selective permeable membrane cartridge 6.

[0021] Preferably, a handle 16 is provided on the titanium blue 8. The handle 16 is used to facilitate lifting the titanium blue 8 to add the silver plate.

[0022] Preferably, it also includes a PLC controller 17 and a current detection device 18, wherein the current detection device 18 is used to detect the high-frequency current value on the electroplating tank and transmit it to the PLC controller 17, and the PLC controller 17 sets the working current value of the first high-frequency rectifier 4 according to the high-frequency current value. This facilitates the staff to set the working current value of the first high-frequency rectifier 4. Normally, the working current value of the first high-frequency rectifier 4 is consistent with the high-frequency current value on the electroplating tank.

[0023] like Figure 3 As shown, an electroplating production line implemented by the precious metal ion exchanger of the utility model includes an electroplating tank 19 and a second anode 20 and a second cathode 21 arranged above the electroplating tank 19, wherein the second anode 20 is connected to the positive pole of the power supply of the second high-frequency rectifier 25. The second cathode 21 is connected to the negative pole of the power supply of the second high-frequency rectifier 25. The electroplating tank 19 is connected to the precious metal ion exchanger a described in Example 1 through a positive electrode circulation pipeline 22 and a positive electrode circulation pump 23, and the main salt-potassium silver cyanide is supplemented to the electroplating tank 19 through the precious metal ion exchanger a, and a stainless steel plate 24 is hung on the second cathode 21.

[0024] The electroplating process of this electroplating production line includes the following steps:

[0025] Step 1): Add KOH solution to the KOH solution replenishment tank. The KOH solution is mixed in a ratio of 20L pure water and 1Kg analytical pure KOH. Add the plating solution to the ion exchange tank and the plating tank.

[0026] Step 2): Place a high-purity (99.99%) silver plate in titanium blue, hang a stainless steel plate in the electroplating tank, hang the electroplated workpiece on the second cathode of the electroplating tank, and immerse it in the electroplating solution;

[0027] Step 3): Detect the high-frequency current value of the current electroplating tank by the current detection device, and transmit it to the PLC controller, the PLC controller uses the high-frequency current value as the working current value of the first high-frequency rectifier, or adjusts it based on the high-frequency current value as the working current value of the first high-frequency rectifier;

[0028] Step 4): When the plating tank is electroplating, the KOH solution in the KOH solution replenishment tank and the ion selective permeable membrane cylinder forms a circulation through the negative electrode circulation pipeline and the negative electrode circulation pump, and the plating solution in the ion exchange tank and the plating tank forms a circulation through the positive electrode circulation pipeline and the positive electrode circulation pump.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention are included in the protection scope of the present invention.

Claims

1. A precious metal ion exchanger, comprising an ion exchange tank (1) and a first anode (2) and a first cathode (3) arranged in the ion exchange tank (1), characterized in that: The first anode (2) is connected to the positive pole of the power supply of the first high-frequency rectifier (4), the first cathode (3) is connected to the negative pole of the power supply of the first high-frequency rectifier (4), a group of ion selective permeable membrane cartridges (6) are arranged in the ion exchange tank (1) through a bracket (5), the ion selective permeable membrane cartridge (6) contains a KOH solution, the first cathode (3) is arranged in the ion selective permeable membrane cartridge (6) and is at least partially immersed in the KOH solution, the ion exchange tank (1) contains an electroplating solution, and the first anode (2) is at least partially immersed in the electroplating solution.

2. The noble metal ion exchanger according to claim 1, characterized in that: The first anode (2) comprises a first anode main electrode (7), titanium blue (8) hung on the first anode main electrode (7), and a precious metal plate (9) placed in the titanium blue (8), and is connected to the positive pole of the power supply of the first high-frequency rectifier (4) through the first anode main electrode (7), and the titanium blue (8) and the precious metal plate (9) are immersed in the electroplating solution.

3. The noble metal ion exchanger according to claim 1, characterized in that: The first cathode (3) comprises a stainless steel rod (10) and a cathode main electrode (11) connected to the top of the stainless steel rod (10), and is connected to the negative pole of the power supply of the first high-frequency rectifier (4) via the cathode main electrode (11).

4. The noble metal ion exchanger according to claim 1, characterized in that: A KOH solution replenishing tank (12) is provided next to the ion exchange tank (1), and the KOH solution replenishing tank (12) replenishes the KOH solution for the ion selective permeable membrane cartridge (6) via a negative electrode circulation pipeline (13) and a negative electrode circulation pump (14).

5. The noble metal ion exchanger according to claim 1, characterized in that: The support (5) is provided with a group of mounting holes (15), and the ion selective permeable membrane cartridge (6) is movably arranged in the mounting holes (15).

6. The noble metal ion exchanger according to claim 2, characterized in that: The titanium blue (8) is provided with a handle (16).

7. The noble metal ion exchanger according to claim 2, characterized in that: The precious metal plate (9) is a silver plate.

8. The noble metal ion exchanger according to claim 1, characterized in that: It also includes a PLC controller (17) and a current detection device (18), wherein the current detection device (18) is used to detect the high-frequency current value on the electroplating tank and transmit it to the PLC controller (17), and the PLC controller (17) sets the working current value of the first high-frequency rectifier (4) according to the high-frequency current value.

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