Electrolytic preparation apparatus for chloroauric acid

Description

Electrolytic preparation device of chloroauric acid TECHNICAL FIELD

[0001] The present application relates to the technical field of chloroauric acid preparation, in particular to an electrolytic preparation device of chloroauric acid. BACKGROUND

[0002] Chloroauric acid is a very important raw material in gold plating and nanometer gold preparation process, and its demand in the fields of electronics, decoration and atomic energy increases year by year.

[0003] Electrolysis is a common method for preparing chloroauric acid. In this method, chlorine is used to prepare chloroauric acid at room temperature by ion membrane electrolysis. The auxiliary oxidation of H2O2 is used to improve the electrolysis rate of chloroauric acid. The electrolyte Cl- concentration, electrolyte pH and H2O2 content are adjusted and optimized to obtain the best process conditions.

[0004] However, when the voltage in the tank of the existing preparation device rises to 1.30V, the surface of the Au anode will be passivated. At this time, the anode needs to be taken out for washing or inhibition treatment, which affects the electrolytic preparation efficiency. Therefore, we provide an electrolytic preparation device of chloroauric acid. SUMMARY

[0005] Technical problem: In view of the problem that the surface of the Au anode will be passivated when the voltage in the tank of the existing preparation device rises to 1.30V, the anode needs to be taken out for washing or inhibition treatment, which affects the electrolytic preparation efficiency, the present application provides an electrolytic preparation device of chloroauric acid.

[0006] Technical scheme: The electrolytic preparation device of chloroauric acid comprises a preparation tank, two liquid discharge pipes are arranged on the two sides below the front end of the preparation tank, a center partition is arranged at the middle position in the interior of the preparation tank, a flange plate frame is arranged in the interior of the center partition, an anion exchange membrane is arranged in the interior of the flange plate frame, a reference electrode is arranged on one side of the anion exchange membrane, an anode plate is arranged on one side of the reference electrode, a cathode plate is arranged on the other side of the anion exchange membrane, a connecting frame is arranged above the anode plate and the cathode plate, a support rod is installed on the upper end of the connecting frame, the two ends of the support rod are connected with the preparation tank through supports, and a passivation cleaning mechanism is further arranged above the anode plate.

[0007] The passivation cleaning mechanism comprises a transmission seat provided at the top end of the support rod above the anode plate, a butt joint provided at the lower end of the transmission seat, a connecting head mounted at the lower end of the butt joint, a brush roller mounted at the lower end of the connecting head, an asynchronous motor mounted at the upper end of the transmission seat, a guide rail provided at one side of the transmission seat, a transmission connection between the transmission seat and the guide rail through a driving sliding block, a servo motor mounted at one end of the guide rail, a spray pipe provided at both sides of the support rod of the anode plate, and a plurality of branch pipes provided at the lower end of the spray pipe and equidistantly distributed.

[0008] Further, a lead screw is mounted in the guide rail and in transmission connection with the driving sliding block, and the output end of the servo motor extends into the guide rail and is in transmission connection with the lead screw.

[0009] Further, a guide column is provided at the other side of the transmission seat, both ends of the guide column are fixedly connected with the preparation pool through a support, and the transmission seat is in sliding connection with the guide column through a driven sliding block.

[0010] Further, a first bearing is mounted at the connection between the driven sliding block and the guide column.

[0011] Further, a butt joint groove is arranged in the butt joint, limit holes are arranged at both sides of the butt joint and in communication with the butt joint, a contraction groove is arranged in the butt joint at both sides, a spring is mounted in the contraction groove, a clamping block is mounted at the end of the spring, and the butt joint is in clamping connection with the limit hole of the butt joint through the clamping block.

[0012] Further, the upper end of the butt joint extends into the transmission seat and is mounted with a driven gear, the output end of the asynchronous motor extends into the transmission seat and is mounted with a driving gear, the output end of the asynchronous motor is in meshing transmission connection with the driven gear through the driving gear, and a second bearing is mounted at the connection between the butt joint and the transmission seat.

[0013] Further, a plurality of nozzles are mounted at the inner side of the branch pipe and equidistantly distributed, and the nozzles are downwardly inclined.

[0014] Further, the anode plate is made of Au, the cathode plate is made of graphite, and the reference electrode is a saturated calomel electrode.

[0015] Further, a fastener is mounted at the connection between the two ends of the support rod and the support.

[0016] Further, the flange plate frame is connected with the center partition flange through bolts at the four corners.

[0017] Beneficial effects: Compared with the prior art, the significant features of the present application are:

[0018] 1. In the electrolysis process, when the surface of the Au anode plate is passivated, a U-shaped three-way pipe is connected to a pumping device, and hydrochloric acid is pumped into the spray pipe along the U-shaped three-way pipe, and the hydrochloric acid liquid is sprayed onto the Au anode plate through the nozzles of the branch pipes below the spray pipe. Since the main passivation product of the anode plate is trivalent crystalline oxide, it is easily dissolved in hydrochloric acid, and under the action of hydrochloric acid spraying, it is oxidized and dissolved in the preparation tank to produce hydrogen ions and combine with chloride ions in the electrolyte to form hydrogen chloride, which promotes the generation and at the same time supplements the electrolyte.

[0019] 2. In the process of spraying and removing the passivation of the Au anode plate, the servo motor can be driven to rotate the lead screw, which drives the driven block to move along the guide rail. During the movement, the asynchronous motor above the transmission seat is driven to rotate the driving gear and mesh with the driven gears on both sides to rotate the two groups of brush rollers, which cooperate with the movement to brush the both sides of the anode plate. Further inhibit the passivation of the Au anode plate. The whole brushing process can be directly carried out in the preparation tank without disassembling and taking out the Au anode plate. The problem of affecting the electrolytic preparation efficiency is solved. When the voltage in the existing preparation device rises to 1.30V, the surface of the Au anode will be passivated, and at this time the anode needs to be taken out for washing or inhibition treatment. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a schematic diagram of the overall structure of the present application;

[0021] Figure 2 is a schematic diagram of the bamboo weaving support structure of the present application;

[0022] Figure 3 is a schematic diagram of the transmission shaft and extension outer rod structure of the present application;

[0023] Figure 4 is an enlarged schematic diagram of part of the structure of the chloroauric acid electrolytic preparation device of the present application;

[0024] Figure 5 is a schematic diagram of the reset frame and compression plate structure of the present application;

[0025] In the figure: 1, preparation pool; 2, liquid discharge pipe; 3, center partition; 4, flange plate frame; 5, anion exchange membrane; 6, bolt; 7, reference electrode; 8, anode plate; 9, cathode plate; 10, connecting frame; 11, support rod; 12, support; 13, fastener; 14, transmission seat; 15, asynchronous motor; 16, guide rail; 17, servo motor; 18, guide column; 19, support; 20, driven slider; 21, first bearing; 22, spray pipe; 23, branch pipe; 24, nozzle; 25, U-shaped tee; 26, lead screw; 27, driving slider; 28, brush roller; 29, connector; 30, butt joint; 31, driving gear; 32, driven gear; 33, second bearing; 34, clamping block; 35, limiting hole; 36, butt joint groove; 37, shrinkage groove; 38, spring. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.

[0027] As shown in FIGS. 1-5, the present application provides an electrolytic preparation device for chloroauric acid, which comprises a preparation pool 1, two liquid discharge pipes 2 are arranged on both sides of the lower front end of the preparation pool 1, a center partition 3 is arranged at the middle position inside the preparation pool 1, a flange plate frame 4 is arranged inside the center partition 3, an anion exchange membrane 5 is arranged inside the flange plate frame 4, a reference electrode 7 is arranged on one side of the anion exchange membrane 5, an anode plate 8 is arranged on one side of the reference electrode 7, a cathode plate 9 is arranged on the other side of the anion exchange membrane 5, a connecting frame 10 is mounted above the anode plate 8 and the cathode plate 9, a support rod 11 is mounted at the upper end of the connecting frame 10, the support rod 11 is connected with the preparation pool 1 through supports 12 at both ends, a transmission seat 14 is arranged above the support rod 11 of the anode plate 8, butt joints 30 are arranged on both sides of the lower end of the transmission seat 14, connectors 29 are mounted at the lower end of the butt joints 30, brush rollers 28 are mounted at the lower end of the connectors 29, an asynchronous motor 15 is mounted at the upper end of the transmission seat 14, a guide rail 16 is arranged on one side of the transmission seat 14, the transmission seat 14 is in transmission connection with the guide rail 16 through a driving slider 27, a servo motor 17 is mounted at one end of the guide rail 16, spray pipes 22 are arranged on both sides of the support rod 11 of the anode plate 8, a plurality of branch pipes 23 are arranged at the lower end of the spray pipes 22, and the plurality of branch pipes 23 are equidistantly arranged, the front ends of the spray pipes 22 on both sides are communicated through a U-shaped tee 25; a plurality of nozzles 24 are mounted inside the branch pipes 23, and the plurality of nozzles 24 are equidistantly arranged, the nozzles 24 are arranged downwardly inclined, which can improve the coverage range of the nozzles 24 and improve the cleaning efficiency.

[0028] Preferably, the spray pipe 22 is provided with 5 branch pipes 23 on both sides, but not limited to 5, and the number of branch pipes 23 can be adjusted according to the use requirement; the inner side of the branch pipe 23 is provided with 6 nozzles 24, but not limited to 6, and the number of nozzles 24 can be adjusted according to the use requirement.

[0029] As shown in Figure 3, the inside of the guide rail 16 is provided with a lead screw 26, and the lead screw 26 is in transmission connection with a driving slider 27; the output end of the servo motor 17 penetrates and extends to the inside of the guide rail 16 and is in transmission connection with the lead screw 26; the output end of the servo motor 17 can drive the lead screw 26 to rotate, and the lead screw 26 is in transmission with the driving slider 27, thereby driving the transmission seat 14 to move along the guide rail 16.

[0030] Preferably, the other side of the transmission seat 14 is provided with a guide column 18, both ends of the guide column 18 are fixedly connected with the preparation pool 1 through a support 19, and the transmission seat 14 is slidably connected with the guide column 18 through a driven slider 20; in the process of moving along the guide rail 16, the driven slider 20 on the other side of the transmission seat 14 can slide with the guide column 18, thereby achieving the effect of auxiliary guiding and avoiding deviation in the transmission process.

[0031] The first bearing 21 is installed at the connection position of the driven slider 20 and the guide column 18, and the first bearing 21 can improve the sliding accuracy of the driven slider 20 and the guide column 18.

[0032] As shown in Figures 4 and 6, the inside of the adapter 30 is provided with an adapter slot 36, the two sides of the adapter 30 are provided with limiting holes 34, the limiting holes 34 are in communication with the adapter 30, the inside of the connecting head 29 is provided with a contraction slot 37, the inside of the contraction slot 37 is provided with a spring 38, the end of the spring 38 is provided with a clamping block 35, the connecting head 29 is in clamping connection with the limiting hole 34 of the adapter 30 through the clamping block 35, and the adapter 30 and the connecting head 29 adopt a spring clamping structure, which is convenient to disassemble and assemble; when it is necessary to separate, replace or clean the brush roller 28, the clamping block 35 on both sides is only needed to be pressed to shrink into the contraction slot 37, and then the connecting head 29 is pulled down, so that the connecting head 29 is separated from the adapter 30.

[0033] As shown in Figure 5, the upper end of the adapter 30 penetrates and extends to the inside of the transmission seat 14 and is provided with a driven gear 32, the output end of the asynchronous motor 15 penetrates and extends to the inside of the transmission seat 14 and is provided with a driving gear 31, the output end of the asynchronous motor 15 is in meshing transmission connection with the driving gear 31 and the driven gear 32 through the driving gear 31, and the adapter 30 is provided with a second bearing 33 at the connection position with the transmission seat 14.

[0034] Preferably, the anode plate 8 is Au, the cathode plate 9 is graphite, and the reference electrode 7 is a saturated calomel electrode.

[0035] As shown in Figure 1, the fastener 13 is installed at the connection between the two ends of the support rod 11 and the bracket 12, and the anode plate 8, the cathode plate 9 and the reference electrode 7 are detachable structures for facilitating maintenance.

[0036] Preferably, the flange plate frame 4 is connected to the center partition plate 3 through bolts 6 at four corners, and the anion exchange membrane 5 can be removed together with the flange plate frame 4 for convenient replacement.

[0037] Working principle: The preparation tank 1 is made of organic glass, the anion exchange membrane 5 is fixed between the cathode chamber and the anode chamber through the flange plate frame 4, Au is used as the anode plate 8, graphite is used as the cathode plate 9, and the saturated calomel electrode is used as the reference electrode 7, and the chloroauric acid is prepared in a three-electrode double-chamber tank. 80 mL of 0.1 mol / L hydrochloric acid is poured into the anode chamber and the cathode chamber, electrolysis is carried out at a constant potential of 1.25 V (vs. SCE), the pH of the electrolyte is adjusted by adding sodium hydroxide solution dropwise, the required amount of sodium chloride solid is calculated according to the concentration formula to adjust the Cl- concentration of the electrolyte, and after the electrolysis is completed, the yellow liquid in the anode chamber is the chloroauric acid solution. The chloroauric acid solution in the anode chamber is evaporated to a brown viscous state at 100°C, and orange needle-shaped crystals are obtained by cooling and crystallizing at room temperature, that is, orange chloroauric acid solid is prepared. In the electrolysis process, when the surface of the Au anode plate 8 is passivated, a pump device is connected to the U-shaped three-way pipe 25, the hydrochloric acid is pumped along the U-shaped three-way pipe 25 into the spray pipe 22, and the hydrochloric acid solution is sprayed onto the Au anode plate 8 through the nozzles 24 of the several branch pipes 23 below the spray pipe 22. Because the passivation of the anode plate 8 mainly forms trivalent oxide, which is easily dissolved in hydrochloric acid, under the action of the spray of hydrochloric acid, it is oxidized and dissolved in the preparation tank 1, generating hydrogen ions and combining with the chloride ions in the electrolyte to form hydrogen chloride, which promotes the generation and at the same time supplements the electrolyte. During spraying, the servo motor 17 is driven to rotate the lead screw 26, which is in transmission with the driving block 27, so that the transmission seat 14 moves along the guide rail 16. During the movement, the asynchronous motor 15 above the transmission seat 14 is driven to rotate the driving gear 31, which is in meshing transmission with the driven gears 32 on both sides, so that the two groups of brush rollers 28 rotate, and the anode plate 8 on both sides is brushed and washed, further inhibiting the passivation of the Au anode plate 8.

Claims

The application relates to an electrolytic preparation device of chloroauric acid, which comprises a preparation tank (1), and discharge pipes (2) are arranged on both sides below the front end of the preparation tank (1), characterized in that: The inside of the preparation tank (1) is provided with a central partition (3) at the middle position, the inside of the central partition (3) is provided with a flange plate frame (4), the inside of the flange plate frame (4) is provided with an anion exchange membrane (5), one side of the anion exchange membrane (5) is provided with a reference electrode (7), one side of the reference electrode (7) is provided with an anode plate (8), the other side of the anion exchange membrane (5) is provided with a cathode plate (9), the upper sides of the anode plate (8) and the cathode plate (9) are provided with connecting frames (10), the upper ends of the connecting frames (10) are provided with support rods (11), the two ends of the support rods (11) are connected with the preparation tank (1) through supports (12), and the upper side of the anode plate (8) is also provided with a passivation cleaning mechanism. The passivation cleaning mechanism comprises a transmission seat (14) arranged at the top end of the support rod (11) above the anode plate (8), a butt joint (30) arranged at the lower end of the transmission seat (14), a connecting head (29) arranged at the lower end of the butt joint (30), a brush roller (28) arranged at the lower end of the connecting head (29), an asynchronous motor (15) arranged at the upper end of the transmission seat (14), a guide rail (16) arranged at one side of the transmission seat (14), a transmission connection between the transmission seat (14) and the guide rail (16) through a driving sliding block (27), a servo motor (17) arranged at one end of the guide rail (16), a spraying pipe (22) arranged at the two sides of the support rod (11) of the anode plate (8), and a plurality of branch pipes (23) arranged at the lower end of the spraying pipe (22) and equidistantly arranged, and the front ends of the two spraying pipes (22) are connected in communication through a U-shaped three-way pipe (25). The device for electrolytic preparation of chloroauric acid according to claim 1 is characterized in that: A lead screw (26) is arranged in the guide rail (16) and is in transmission connection with the driving sliding block (27), and the output end of the servo motor (17) penetrates and extends into the inside of the guide rail (16) and is in transmission connection with the lead screw (26). The device for electrolytic preparation of chloroauric acid according to claim 2 is characterized in that: The other side of the transmission seat (14) is provided with a guide column (18), the two ends of the guide column (18) are fixedly connected with the preparation tank (1) through supports (19), and the transmission seat (14) is in sliding connection with the guide column (18) through a driven sliding block (20). The device for electrolytic preparation of chloroauric acid according to claim 3 is characterized in that: A first bearing (21) is arranged at the connection between the driven sliding block (20) and the guide column (18). The device for electrolytic preparation of chloroauric acid according to claim 1 is characterized in that: The inside of the butt joint (30) is provided with a butt joint groove (36), the two sides of the butt joint (30) are provided with limiting holes (34) in communication with the butt joint (30), the insides of the two sides of the connecting head (29) are provided with contraction grooves (37), the contraction grooves (37) are provided with springs (38) in the insides, the ends of the springs (38) are provided with clamping blocks (35), and the connecting head (29) is in clamping connection with the limiting holes (34) on the butt joint (30) through the clamping blocks (35). The device for electrolytic preparation of chloroauric acid according to claim 5, characterized in that: The upper end of the adapter (30) penetrates and extends to the inside of the transmission seat (14), and a driven gear (32) is installed, the output end of the asynchronous motor (15) penetrates and extends to the inside of the transmission seat (14), and a driving gear (31) is installed, the output end of the asynchronous motor (15) is connected in transmission through the driving gear (31) and the driven gear (32) meshing, and the second bearing (33) is installed at the connection between the adapter (30) and the transmission seat (14). The device for electrolytic preparation of chloroauric acid according to claim 6, characterized in that: The inside of the branch pipe (23) is provided with a plurality of nozzles (24), and the nozzles (24) are equidistantly distributed, and the nozzles (24) are inclined downward. The device for electrolytic preparation of chloroauric acid according to claim 7, characterized in that: The anode plate (8) is Au, the cathode plate (9) is graphite, and the reference electrode (7) is a saturated calomel electrode. The device for electrolytic preparation of chloroauric acid according to claim 8, characterized in that: The fastener (13) is installed at the connection between the two ends of the support rod (11) and the support (12). The device for electrolytic preparation of chloroauric acid according to claim 8, characterized in that: The four corners of the flange plate frame (4) are connected with the center partition plate (3) through bolts (6).

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