Anti-solvent crystallization apparatus for a cyanide-free electroplating gold solution

Abstract

The present application relates to a kind of cyanide-free electroplating gold solution anti-solvent crystallization equipment, comprising: tank body;Stirring mechanism, including stirring paddle, flow channel is arranged in stirring paddle;Crystal forming mechanism, crystal forming mechanism includes forming shell, and forming shell is provided with movable push plate;Movable baffle, by longitudinal drive mechanism drive, movable baffle is shielded after downward movement crystal output, and form high concentration ethanol area in forming shell, so that sodium gold sulfite solution is mixed with ethanol, then pass through flow barrier column and diffuse from ethanol outlet, so that sodium gold sulfite forms porous block crystallization in forming shell, movable baffle is opened after upward movement crystal output, and movable push plate is moved towards forming shell outside, to form porous block crystallization in forming shell is exported;Intercept cage, set in the periphery of crystal forming mechanism, and porous block crystallization is collected after being exported by intercept cage.

Description

Technical Field

[0001] This invention relates to the field of crystallization equipment, specifically to an anti-solvent crystallization device for a cyanide-free electroplating gold solution. Background Technology

[0002] Cyanide-free gold plating solution is an environmentally friendly plating solution. Compared to traditional cyanide gold plating, cyanide-free gold plating offers higher stability and safety. It uses sodium gold sulfite instead of cyanide as the gold plating source, making the entire plating process more environmentally friendly.

[0003] The preparation method of sodium gold sulfite solution generally involves reacting chloroauric acid with sodium sulfite to generate a crude sodium gold sulfite solution. Then, an antisolvent is used to precipitate the sodium gold sulfite from the crude solution, forming crystals. Finally, the sodium gold sulfite crystals are dissolved in the sodium sulfite solution to prepare a sodium gold sulfite solution. In the process of precipitating sodium gold sulfite from the crude solution using an antisolvent, ethanol is generally used. The addition of ethanol must be done very carefully and slowly, as the formed crystals have poor stability and are easily partially dissolved or transformed into amorphous precipitates under pH and temperature fluctuations, thus affecting subsequent steps such as filtration.

[0004] The purpose of this invention is to design an anti-solvent crystallization device for cyanide-free electroplating gold solution to address the problems existing in the prior art. Summary of the Invention

[0005] In view of the problems existing in the prior art, the present invention provides an anti-solvent crystallization device for cyanide-free electroplating gold solution, which can effectively solve at least one of the problems existing in the prior art.

[0006] The technical solution of this invention is:

[0007] A solvent crystallization apparatus for a cyanide-free gold plating solution includes:

[0008] The tank body is equipped with a cover, and a waste liquid outlet is provided at the bottom of the tank.

[0009] The stirring mechanism includes a stirring paddle, which is connected to a drive motor via a rotary joint bearing. A flow channel is provided inside the stirring paddle, one end of which is connected to the rotary joint bearing, which is connected to an external ethanol source.

[0010] The crystallization forming mechanism includes a forming shell, which is connected to the end of the stirring paddle. A crystallization outlet is provided on the circumferential side of the forming shell facing the stirring paddle, and an ethanol outlet is provided on the side of the forming shell away from the stirring paddle. Multiple baffle columns are provided inside the forming shell, and a movable push plate is provided inside the forming shell.

[0011] The movable baffle is driven by a longitudinal drive mechanism. The movable baffle is equipped with several liquid inlets, each equipped with a liquid inlet device. When the agitator rotates, the liquid inlet device introduces the sodium gold sulfite solution from the tank into the molding shell. After the movable baffle moves downward, it blocks the crystallization outlet, forming a high-concentration ethanol area inside the molding shell. The sodium gold sulfite solution mixes with the ethanol and then passes through the baffle column before diffusing from the ethanol outlet, causing the sodium gold sulfite to form porous block crystals inside the molding shell. After the movable baffle moves upward, it opens the crystallization outlet and causes the movable push plate to move towards the outside of the molding shell, thereby outputting the porous block crystals inside the molding shell.

[0012] An intercepting cage is set around the crystallization forming mechanism. After the porous block crystals are output, they are collected by the intercepting cage.

[0013] Furthermore, the agitator is equipped with a mounting plate, the interception cage is detachably mounted on the mounting plate, the top of the interception cage is provided with a movable groove, and the bottom end of the longitudinal drive mechanism passes through the movable groove and is connected to the movable baffle.

[0014] Furthermore, the liquid feeding device includes a screw conveyor, which is driven by corresponding rotating blades. When the agitator rotates, it drives the rotating blades to rotate.

[0015] Furthermore, the multiple baffle columns include several small baffle columns and several large baffle columns. The several small baffle columns are arranged on the half of the molded shell close to the agitator, and the several large baffle columns are arranged on the half of the molded shell away from the agitator. The number of small baffle columns is greater than the number of large baffle columns.

[0016] Furthermore, the total cross-sectional area of ​​several small baffle columns is smaller than the total cross-sectional area of ​​several large baffle columns.

[0017] Furthermore, an elastic element is provided between the movable push plate and the molding shell. The edge of the movable push plate is provided with a first inclined surface, and the bottom end of the movable baffle is provided with a second inclined surface. When the movable baffle moves downward, the second inclined surface presses against the first inclined surface, causing the movable push plate to press against the elastic element and move towards the inside of the molding shell. When the movable baffle moves upward, the movable push plate is pushed out of the molding shell by the elastic element.

[0018] Furthermore, the control methods include:

[0019] During the stirring process of the stirring mechanism, the movable baffle is controlled to move downward and block the crystallization outlet, continuously conveying ethanol into the crystallization forming mechanism through the diversion channel, and allowing the ethanol to diffuse into the tank, forming porous block crystals in the forming shell.

[0020] The periodic control baffle moves upward to output porous block crystals and drop them into the interception cage. The stirring mechanism drives the porous block crystals in the interception cage to capture the fine crystals in the tank.

[0021] Therefore, the present invention provides the following effects and / or advantages:

[0022] This application utilizes a crystallization mechanism and a movable baffle to introduce ethanol into the crystallization mechanism via a flow channel, while simultaneously introducing sodium gold sulfite solution into the crystallization mechanism. High-concentration ethanol is formed within the crystallization mechanism, causing the sodium gold sulfite solution to rapidly crystallize into a blocky, porous structure. The crystals are then output, allowing the porous blocky crystals to contact the sodium gold sulfite and ethanol within the tank within the interception cage, enabling the porous blocky crystals to continue growing and crystallizing. Simultaneously, the porous and loose structure of the porous blocky crystals filters out fine crystals from the liquid within the tank.

[0023] This application enables the crystallization mechanism to undergo various state changes through the movable baffle, allowing it to change between rapid crystallization and output crystallization.

[0024] By setting up flow-blocking columns, this application can create varying ethanol concentrations within the crystal-forming structure. Furthermore, the ethanol and sodium gold sulfite solution are repeatedly diverted and mixed under the action of the flow-blocking columns, making it easier for them to crystallize and form a blocky, porous structure.

[0025] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained through the structures particularly pointed out in the description and the drawings.

[0026] It should be understood that the above summary and the following detailed description of the invention are exemplary and explanatory, and are intended to provide further explanation of the invention as claimed. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of an embodiment of the present invention.

[0028] Figure 2 This is a schematic diagram of the internal structure of the tank body of the present invention.

[0029] Figure 3 This is a schematic diagram of the stirring mechanism of the present invention.

[0030] Figure 4 This is a cross-sectional view of the stirring mechanism of the present invention.

[0031] Figure 5 This is a schematic diagram of the crystallization and forming mechanism after the movable baffle of the present invention moves upward.

[0032] Figure 6 This is a schematic diagram of the crystallization and forming mechanism after the movable baffle of the present invention moves downward.

[0033] Figure 7 This is a cross-sectional view of the crystallization and forming mechanism.

[0034] Explanation of reference numerals in the attached figures:

[0035] Tank body 1, cover body 11, stirring mechanism 2, stirring paddle 21, rotary joint bearing 22, drive motor 23, diversion channel 24, crystallization forming mechanism 3, forming shell 31, crystallization outlet 311, ethanol outlet 312, baffle column 32, small baffle column 321, large baffle column 322, movable push plate 33, elastic element 331, movable baffle 4, liquid inlet device 5, screw conveyor 51, rotating blade 52, longitudinal drive mechanism 6, interception cage 7. Detailed Implementation

[0036] To facilitate understanding by those skilled in the art, the structure of the present invention will now be described in further detail with reference to the accompanying drawings:

[0037] refer to Figure 1-7 A solvent-reactive crystallization apparatus for a cyanide-free gold plating solution, comprising:

[0038] Tank 1, the tank 1 is provided with a cover 11, and the bottom of the tank 1 is provided with a waste liquid outlet;

[0039] In this embodiment, the tank 1 provides a closed reaction and stirring space, equipped with a cover 11 and a waste liquid outlet to facilitate the discharge of waste liquid after the reaction. When in use, the tank 1 is filled with sodium gold sulfite solution.

[0040] The stirring mechanism 2 includes a stirring paddle 21, which is connected to a drive motor 23 via a rotary joint bearing 22. A flow channel 24 is provided inside the stirring paddle 21, one end of which is connected to the rotary joint bearing 22, and the rotary joint bearing 22 is connected to an external ethanol source.

[0041] In this embodiment, the stirring paddle 21 is connected to the drive motor 23 via a rotary joint bearing 22, which can effectively stir the solution and ensure that the sodium gold sulfite solution and ethanol can be in full contact. The drainage channel 24 helps to guide the ethanol to the end of the stirring paddle 21, so that the ethanol and sodium gold sulfite solution can come into contact.

[0042] The crystallization forming mechanism 3 includes a forming shell 31, which is connected to the end of the stirring paddle 21. A crystallization outlet 311 is provided on the circumferential side of the forming shell 31 facing the stirring paddle 21, and an ethanol outlet 312 is provided on the side of the forming shell 31 away from the stirring paddle 21. A plurality of baffle columns 32 are provided inside the forming shell 31, and a movable push plate 33 is provided inside the forming shell 31.

[0043] The movable baffle 4 is driven by the longitudinal drive mechanism 6. The movable baffle 4 is provided with several liquid inlets, and each liquid inlet is provided with a liquid inlet device 5. When the stirring paddle 21 rotates, the liquid inlet device 5 inputs the sodium gold sulfite solution in the tank 1 into the molding shell 31. After the movable baffle 4 moves downward, it blocks the crystallization outlet 311, forming a high-concentration ethanol area in the molding shell 31. The sodium gold sulfite solution mixes with ethanol and then passes through the baffle column 32 and diffuses from the ethanol outlet 312, causing the sodium gold sulfite to form porous block crystals in the molding shell 31. After the movable baffle 4 moves upward, it opens the crystallization outlet 311 and causes the movable push plate 33 to move towards the outside of the molding shell 31, thereby outputting the porous block crystals in the molding shell 31.

[0044] In this embodiment, the crystallization forming mechanism 3 and the movable baffle 4 are core structures. The forming shell 31 is connected to the end of the stirring paddle 21, so that it can receive the ethanol delivered by the guide channel 24 at the end closest to the stirring paddle 21. At this time, the movable baffle 4 is in a downward moving state, blocking the crystallization outlet 311, so that the ethanol first accumulates in the forming shell 31. In addition, during the rotation of the stirring paddle 21, the liquid inlet device 5 drives the sodium gold sulfite solution to be introduced into the forming shell 31. The sodium gold sulfite mixes with the high concentration of ethanol in the forming shell 31. The sodium gold sulfite crystallizes rapidly in the forming shell 31 and grows on the surface of the forming shell 31 and the baffle column 32, forming loose, porous blocky crystals. Then, the ethanol flows into the tank 1 from the ethanol outlet 312 after passing through the baffle column 32. On the one hand, the ethanol is dispersed by the baffle column 32 and comes into contact with the sodium gold sulfite solution in the tank 1 under the stirring action of the stirring paddle 21, so that the sodium gold sulfite in the tank 1 slowly crystallizes. The crystals are in the shape of fine powder.

[0045] Then, after a certain period of time, once enough porous crystals have grown inside the molded shell 31, the porous block crystals need to be output. At this time, the movable baffle 4 moves upward to open the crystal output port 311, and the movable push plate 33 pushes outward to output the porous block crystals.

[0046] An intercepting cage 7 is disposed around the crystallization forming mechanism 3, and the porous block crystals are collected by the intercepting cage 7 after being output.

[0047] In this embodiment, the porous crystal output falls into the interception cage 7, which rotates together with the stirring paddle 21. As mentioned above, ethanol eventually flows into the tank 1, causing sodium gold sulfite in the tank 1 to slowly crystallize. At this time, there are fine crystals in the tank 1 and porous block crystals in the interception cage 7. During the further addition of ethanol, the fine crystals begin to nucleate and grow into granular crystals, while the porous and loose structure of the porous block crystals rotates together with the interception cage 7 to capture and filter the granular crystals, ultimately obtaining a more compact block crystal structure.

[0048] Furthermore, the stirring paddle 21 is provided with a mounting plate, the interception cage 7 is detachably mounted on the mounting plate, the top of the interception cage 7 is provided with a movable groove, and the bottom end of the longitudinal drive mechanism 6 passes through the movable groove and is connected to the movable baffle 4.

[0049] In this embodiment, the intercepting cage 7 can be detachably installed via the mounting plate. The intercepting cage 7 can be a cage-like structure, thereby forming a structure supported on the outer periphery of the crystallization forming mechanism 3. The movable groove provides the moving path of the longitudinal drive mechanism 6 when installing or removing the intercepting cage 7.

[0050] Furthermore, the liquid inlet device 5 includes a screw conveyor 51, which is driven by a corresponding rotating blade 52. When the stirring paddle rotates, it drives the rotating blade 52 to rotate.

[0051] In this embodiment, the screw conveyor 51 and the rotating blade 52 work together to drive the screw conveyor 51 to unidirectionally input sodium gold sulfite into the molding shell 31, preventing ethanol from flowing back from the screw conveyor 51 into the tank 1 and thus forming crystal blockage.

[0052] Furthermore, the plurality of baffle columns 32 include a plurality of small baffle columns 321 and a plurality of large baffle columns 322. The plurality of small baffle columns 321 are disposed on the half of the molded housing 31 near the stirring paddle 21, and the plurality of large baffle columns 322 are disposed on the half of the molded housing 31 away from the stirring paddle 21. The number of small baffle columns 321 is greater than the number of large baffle columns 322.

[0053] In this embodiment, ethanol is injected into the molded shell 31 through several small baffle columns 321 and several large baffle columns 322 for diversion and mixing before the small baffle columns 321 and several large baffle columns 322. The large number of small baffle columns 321 allows the ethanol and sodium gold sulfite to be effectively diverted and mixed by the small baffle columns 321, forming vortex areas, thereby rapidly mixing and forming crystals. Afterward, the mixture enters the tank 1 through the large baffle columns 322, and can be diverted by the large baffle columns 322 to disperse into the tank 1.

[0054] Furthermore, the total cross-sectional area of ​​the plurality of small baffle columns 321 is smaller than the total cross-sectional area of ​​the plurality of large baffle columns 322.

[0055] In this embodiment, the total cross-sectional area is set so that more ethanol and sodium gold sulfite mixture gathers in the area corresponding to several small baffles 321 inside the molded shell 31, which can increase the concentration of ethanol and make crystallization faster.

[0056] Furthermore, an elastic element 331 is provided between the movable push plate 33 and the molding shell 31. The edge of the movable push plate 33 is provided with a first inclined surface, and the bottom end of the movable baffle 4 is provided with a second inclined surface. When the movable baffle 4 moves downward, the second inclined surface presses against the first inclined surface, causing the movable push plate 33 to press against the elastic element 331 and move towards the inside of the molding shell 31. When the movable baffle 4 moves upward, the movable push plate 33 is pushed outward by the elastic element 331 from the molding shell 31.

[0057] In this embodiment, through the cooperation of the first inclined surface and the second inclined surface, the movable push plate 33 can move back and forth during the up and down movement of the movable baffle 4. After the movable push plate 33 is pushed forward, it pushes out the flow-blocking column 32 and the porous block crystal formed in the molded shell 31, so that the porous block crystal detaches and falls into the interception cage 7.

[0058] Control methods include:

[0059] During the stirring process of the stirring mechanism 2, the movable baffle 4 is controlled to move downward and block the crystallization outlet 311, continuously conveying ethanol into the crystallization forming mechanism 3 through the diversion channel 24, and allowing the ethanol to diffuse into the tank 1, forming porous block crystals in the forming shell 31.

[0060] The periodic control baffle 4 moves upward to output the porous block crystals and drop them into the interception cage 7. The stirring mechanism 2 drives the porous block crystals in the interception cage 7 to capture the fine crystals in the tank 1.

[0061] It should be noted that any reference signs placed between parentheses in the claims should not be construed as limiting the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claims. The word "a" or "an" preceding a component does not exclude the presence of a plurality of such components. The invention can be implemented by means of hardware comprising several different components and by means of a suitably programmed computer. In a unit claim enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names.

[0062] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0063] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0064] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

Claims

1. A solvent crystallization apparatus for cyanide-free gold plating solution, characterized in that: include: Tank (1), the tank (1) is provided with a cover (11), and the bottom of the tank (1) is provided with a waste liquid outlet; The stirring mechanism (2) includes a stirring paddle (21), which is connected to a drive motor (23) via a rotary joint bearing (22). A flow channel (24) is provided inside the stirring paddle (21), one end of which is connected to the rotary joint bearing (22), and the rotary joint bearing (22) is connected to an external ethanol source. Crystallization forming mechanism (3), the crystallization forming mechanism (3) includes a forming shell (31), the forming shell (31) is connected to the end of the stirring paddle (21), the forming shell (31) has a crystallization outlet (311) on the circumferential side facing the stirring paddle (21), the forming shell (31) has an ethanol outlet (312) on the side away from the stirring paddle (21), a plurality of baffle columns (32) are provided inside the forming shell (31), and a movable push plate (33) is provided inside the forming shell (31). The movable baffle (4) is driven by the longitudinal drive mechanism (6). The movable baffle (4) is provided with several liquid inlets. Each liquid inlet is provided with a liquid inlet device (5). When the stirring paddle (21) rotates, the liquid inlet device (5) inputs the sodium gold sulfite solution in the tank (1) into the molding shell (31). After the movable baffle (4) moves downward, it blocks the crystallization outlet (311), forming a high-concentration ethanol area in the molding shell (31). The sodium gold sulfite solution mixes with ethanol and then passes through the baffle column (32) and diffuses from the ethanol outlet (312), causing the sodium gold sulfite to form porous block crystals in the molding shell (31). After the movable baffle (4) moves upward, it opens the crystallization outlet (311) and causes the movable push plate (33) to move toward the outside of the molding shell (31), thereby outputting the porous block crystals in the molding shell (31). An intercepting cage (7) is set around the crystallization forming mechanism (3), and the porous block crystals are collected by the intercepting cage (7) after being output.

2. The anti-solvent crystallization equipment for a cyanide-free gold plating solution according to claim 1, characterized in that: The stirring paddle (21) is provided with a mounting plate, and the interception cage (7) is detachably installed on the mounting plate. The top of the interception cage (7) is provided with a movable groove, and the bottom end of the longitudinal drive mechanism (6) passes through the movable groove and is connected to the movable baffle (4).

3. The anti-solvent crystallization equipment for a cyanide-free gold plating solution according to claim 1, characterized in that: The liquid inlet device (5) includes a screw conveyor (51), which is driven by a corresponding rotating blade (52). When the stirring paddle rotates, it drives the rotating blade (52) to rotate.

4. The anti-solvent crystallization equipment for a cyanide-free gold plating solution according to claim 1, characterized in that: The plurality of the baffle columns (32) include a plurality of small baffle columns (321) and a plurality of large baffle columns (322). The plurality of small baffle columns (321) are disposed on the half of the molded housing (31) near the stirring paddle (21), and the plurality of large baffle columns (322) are disposed on the half of the molded housing (31) away from the stirring paddle (21). The number of small baffle columns (321) is greater than the number of large baffle columns (322).

5. The anti-solvent crystallization equipment for a cyanide-free gold plating solution according to claim 4, characterized in that: The total cross-sectional area of ​​the plurality of small baffles (321) is smaller than the total cross-sectional area of ​​the plurality of large baffles (322).

6. The anti-solvent crystallization equipment for a cyanide-free gold plating solution according to claim 1, characterized in that: An elastic element (331) is provided between the movable push plate (33) and the molding shell (31). The edge of the movable push plate (33) is provided with a first inclined surface, and the bottom end of the movable baffle (4) is provided with a second inclined surface. When the movable baffle (4) moves downward, the second inclined surface presses the first inclined surface, causing the movable push plate (33) to press the elastic element (331) and move towards the inside of the molding shell (31). When the movable baffle (4) moves upward, the movable push plate (33) is pushed out of the molding shell (31) by the elastic element (331).

7. The anti-solvent crystallization equipment for a cyanide-free gold plating solution according to claim 1, characterized in that: Control methods include: During the stirring process of the stirring mechanism (2), the movable baffle (4) is controlled to move downward and block the crystallization outlet (311), continuously conveying ethanol into the crystallization forming mechanism (3) through the diversion channel (24), and causing the ethanol to diffuse into the tank (1) to form porous block crystals in the forming shell (31). The periodic control baffle (4) moves upward to output the porous block crystals and drop them into the interception cage (7). The stirring mechanism (2) drives the porous block crystals in the interception cage (7) to capture the small crystals in the tank (1).

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