A preparation device and preparation process of sodium gold sulfite solution

Abstract

The invention relates to a preparation device and a preparation process of a sodium gold sulfite solution, comprising: a reaction bottle, the reaction bottle is used to store sodium sulfite; a first containing bottle and a first pump body, the first containing bottle is used to store chloroauric acid; a second containing bottle and a second pump body, the second containing bottle is used to store sodium hydroxide; a droplet particle size adjustment mechanism, comprising a spring and a driving member, the bottom end of the spring is fixedly connected to the liquid outlet end of the second pipeline, the end of the spring extends to the lower side of the liquid outlet end of the second pipeline, after the second pipeline discharges liquid, the droplets are attracted to the bottom end of the spring to converge and then drip, and the pitch of the spring is negatively correlated with the adsorption force of the spring on the droplets; a visual mechanism; a control system, according to the color obtained by the visual mechanism, the stretching amount of the driving member on the spring is controlled to control the particle size of the droplets output by the second pipeline.

Description

Technical Field

[0001] The invention relates to the field of sodium gold sulfite preparation equipment, and in particular to a preparation equipment and a preparation process for a sodium gold sulfite solution. Background Art

[0002] Sodium gold sulfite is the main gold salt used in the sulfite gold plating system. It has a strong resistance to discoloration of the gold plating layer and can be used as a decorative plating layer. At the same time, the gold plating layer of sodium gold sulfite has excellent properties such as corrosion resistance, wear resistance, low contact resistance, and good solderability. It can also be used as a functional and protective plating layer and is widely used in printed circuit boards, semiconductor electronic components manufacturing, and cutting-edge military equipment.

[0003] The prior art can add chloroauric acid to a sodium sulfite solution to generate sodium gold sulfite through a complex reaction. The yield of sodium gold sulfite in the reaction is related to the pH value of the reaction solution. The yield is highest when the pH value is controlled at a specific value. When the pH changes, the incomplete reaction of chloroauric acid will cause the reaction solution to present the light yellow color of chloroauric acid. Since chloroauric acid is a strong acid, in the process of adding it to the sodium sulfite solution, it is necessary to continuously add sodium hydroxide solution to adjust the pH value of the reaction solution so that the pH value remains at the target value. The prior art is to judge the pH value of the reaction solution by observing the color change in the reaction container by the operator. When the reaction solution presents a light yellow color after adding chloroauric acid, sodium hydroxide solution is added to return the pH to the target value and allow the chloroauric acid to fully react, so that the reaction solution presents a transparent color again. On the one hand, this technical means can only be roughly observed or operated by the operator, and there is human error; on the other hand, the sodium hydroxide solution has a certain viscosity. In the process of outputting sodium hydroxide, sodium hydroxide is easily adsorbed at the opening of the dropper and gathered into droplets of different sizes before dripping, so that it is difficult to control the amount of sodium hydroxide added.

[0004] The purpose of the present invention is to design a preparation device and a preparation process for a sodium gold sulfite solution in view of the problems existing in the prior art. Summary of the invention

[0005] In view of the problems existing in the above-mentioned prior art, the present invention provides a preparation device and a preparation process of sodium gold sulfite solution, which can effectively solve at least one problem existing in the above-mentioned prior art.

[0006] The technical solution of the present invention is:

[0007] A preparation device for a sodium gold sulfite solution, comprising:

[0008] A reaction bottle, provided with a stirring element, and used for storing sodium sulfite;

[0009] a first receiving bottle and a first pump body, wherein the first receiving bottle is used to store chloroauric acid, and the first pump body outputs chloroauric acid to the reaction bottle through a first pipeline;

[0010] a second containing bottle and a second pump body, wherein the second containing bottle is used to store sodium hydroxide, and the second pump body outputs sodium sulfite to the reaction bottle through a second pipeline;

[0011] A droplet size adjustment mechanism, comprising a spring and a driving member, wherein the bottom end of the spring is fixedly connected to the liquid outlet end of the second pipe, and the end of the spring extends to the lower side of the liquid outlet end of the second pipe. After the liquid is discharged from the second pipe, the droplets are attracted to the bottom end of the spring, gathered and then dripped. The driving member is connected to the top end of the spring, and the driving member stretches or relaxes the spring to change the pitch of the spring. The pitch of the spring is negatively correlated with the adsorption force of the spring on the droplets.

[0012] A visual mechanism, arranged on the side of the reaction bottle, for obtaining the color in the reaction bottle;

[0013] A control system controls the stretching amount of the spring by the driving member according to the color obtained by the visual mechanism, thereby controlling the particle size of the droplets output by the second pipeline.

[0014] Furthermore, the second pipe is sleeved with a movable sleeve, the movable sleeve is movably arranged up and down along the second pipe, and the top end of the spring is connected to the bottom surface of the movable sleeve.

[0015] Furthermore, the liquid outlet end of the second pipe is narrowed.

[0016] Furthermore, the spring is a tower spring.

[0017] Furthermore, the spring is provided with elastic rods at intervals along the winding direction thereof, and the elastic rods are arranged obliquely upwards.

[0018] Furthermore, when the spring is compressed, the elastic rod is elastically deformed and then laid on the inner ring of the spring. When the spring is stretched, the elastic rod is elastically deformed and then swung toward the outer ring of the spring to separate the droplets outputted from the second pipe.

[0019] A preparation process of a sodium gold sulfite solution is further provided, based on the preparation equipment of the sodium gold sulfite solution, comprising the following steps:

[0020] Slowly outputting chloroauric acid to the sodium sulfite in the reaction bottle through the first pump body;

[0021] Detecting the color of the reaction bottle by the visual mechanism;

[0022] Controlling the driving member to adjust the stretching amount of the spring according to the color of the reaction bottle;

[0023] Sodium hydroxide droplets of corresponding droplet particle size are outputted through the second pump body, so that the sodium hydroxide droplets fall off to the sodium sulfite in the reaction bottle.

[0024] Further, detecting the color of the reaction bottle by the visual mechanism includes: detecting the yellow color of the reaction bottle by the visual mechanism and outputting a yellow depth value;

[0025] Controlling the driving member to adjust the stretching amount of the spring according to the color of the reaction bottle includes: controlling the driving member to adjust the stretching amount of the spring according to the yellow depth value, and the stretching amount is negatively correlated with the yellow depth value.

[0026] Further, after the second pump body outputs the sodium hydroxide droplets of the corresponding droplet particle size, before the sodium hydroxide droplets fall off to the sodium sulfite in the reaction bottle, the method comprises:

[0027] The spring is further stretched by the driving member to swing the elastic rod toward the outer ring of the spring.

[0028] Therefore, the present invention provides the following effects and / or advantages:

[0029] In the present application, chloroauric acid is stored in a first containing bottle and inputted into a reaction bottle filled with sodium sulfite for reaction to generate sodium gold sulfite. During the reaction, sodium hydroxide stored in a second containing bottle is dripped into the reaction bottle to adjust the pH value in the reaction bottle. A droplet size adjustment mechanism is combined to adjust the particle size of the output sodium hydroxide droplets, so that sodium hydroxide droplets of corresponding particle size can be accurately output for adjusting the pH value in the reaction bottle.

[0030] The present application stretches the spring through a driving member, thereby changing the pitch of the spring, and the pitch is used to adjust the contact amount of the spring with the droplet, and is used to adjust the adsorption force of the spring on the droplet, thereby changing the particle size of the droplet.

[0031] The present application provides an elastic rod on the spring, and the elastic rod can be rebounded from the inner circle of the spring to the outer circle of the spring after the spring is stretched. Through this action, the droplets adsorbed on the bottom end of the spring can be detached, thereby obtaining droplets with smaller particle size.

[0032] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description and the drawings.

[0033] It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0035] Figure 2 It is a schematic diagram of the structure of the droplet size adjustment mechanism.

[0036] Figure 3 Schematic diagram of the state where a droplet is adsorbed on the droplet size adjustment mechanism.

[0037] Figure 4 It is a schematic diagram of the state in which the elastic rod is arranged on the inner circle of the spring.

[0038] Figure 5 It is a schematic diagram of the state in which the elastic rod is swung toward the outer ring of the spring.

[0039] Description of reference numerals:

[0040] Reaction bottle 1, stirring member 2, first receiving bottle 3, first pump body 4, first pipeline 5, second receiving bottle 6, second pump body 7, second pipeline 8, movable sleeve 801, droplet size adjustment mechanism 9, spring 901, driving member 902, elastic rod 903. DETAILED DESCRIPTION

[0041] In order to facilitate understanding by those skilled in the art, the structure of the present invention is further described in detail with reference to the embodiments in conjunction with the accompanying drawings:

[0042] refer to Figure 1-2 , a preparation device for sodium gold sulfite solution, comprising:

[0043] A reaction bottle 1 is provided with a stirring member 2, and the reaction bottle 1 is used to store sodium sulfite;

[0044] a first receiving bottle 3 and a first pump body 4, wherein the first receiving bottle 3 is used to store chloroauric acid, and the first pump body 4 outputs chloroauric acid to the reaction bottle through a first pipeline 5;

[0045] a second receiving bottle 6 and a second pump body 7, wherein the second receiving bottle 6 is used to store sodium hydroxide, and the second pump body 7 outputs sodium hydroxide to the reaction bottle 1 through a second pipe 8;

[0046] In this embodiment, the first containing bottle 3, the first pump body 4, the second containing bottle 6 and the second pump body 7 can all be directly adopted from the prior art, which will not be elaborated here. In order to improve the flow control of the pump body, the first pump body 4 and the second pump body 7 can adopt micro pumps.

[0047] The droplet size adjustment mechanism 9 includes a spring 901 and a driving member 902. The bottom end of the spring 901 is fixedly connected to the liquid outlet end of the second pipe 8. The end of the spring 901 extends to the lower side of the liquid outlet end of the second pipe 8. After the liquid is discharged from the second pipe 8, the droplets are attracted to the bottom end of the spring 901, gathered and then dripped. The driving member 902 is connected to the top end of the spring 901. The driving member 902 stretches or relaxes the spring 901 to change the pitch of the spring 901. The pitch of the spring 901 is negatively correlated with the adsorption force of the spring 901 on the droplets.

[0048] The droplet size adjustment mechanism 9 is one of the core improvements of the present application. Since the sodium hydroxide solution is viscous and the viscosity is related to the concentration of sodium hydroxide, the sodium hydroxide is more easily attracted and adsorbed on the surrounding objects, and has the characteristics of being able to gather into droplets of different sizes according to the concentration, external attraction, etc.

[0049] In this embodiment, the bottom end of the spring 901 extends to the lower side of the liquid outlet end of the second pipe 8, so that after the sodium hydroxide is output from the second pipe 8, it will be pulled by the end of the spring 901 and adsorbed to the bottom end of the spring 901 and gathered into droplets. When the second pipe 8 continues to output the sodium hydroxide solution, the droplets gathered at the bottom of the spring 901 become larger and larger. When the weight of the liquid exceeds the adsorption force of the sodium hydroxide solution at the bottom of the spring 901, the droplets fall off and drip into the reaction bottle 1.

[0050] Specifically, Figure 3 As shown, the top of the droplet will be adsorbed to the bottom of the spring 901. When the stretching amount of the spring 901 increases, the pitch D of the spring 901 increases. At this time, the coils of the spring 901 are farther from each other. After the droplet is pulled by the end of the spring 901, the adsorption capacity of the bottom of the spring 901 to the droplet is reduced, and the droplet convergence capacity is also reduced accordingly, so that the particle size of the droplet is smaller when it drips from the bottom of the spring 901. On the contrary, when the stretching amount of the spring 901 decreases, the pitch D of the spring 901 decreases. At this time, the coils of the spring 901 are closer to each other. After the droplet is pulled by the end of the spring 901, the bottom of the spring 901 is more likely to adsorb the droplet, and the droplet convergence capacity is also increased accordingly, so that the particle size of the droplet is larger when it drips from the bottom of the spring 901. Through this structural feature, the pitch of the spring 901 of the spring 901 when the second pump body 7 outputs the droplet can be controlled to control the particle size of the droplet when it drips.

[0051] A visual mechanism (not shown) is disposed on the side of the reaction bottle 1 and is used to obtain the color inside the reaction bottle 1; the visual mechanism may be a camera.

[0052] The control system controls the stretching amount of the spring 901 by the driving member 902 according to the color obtained by the visual mechanism, thereby controlling the particle size of the droplets output by the second pipeline 8.

[0053] In this embodiment, the reaction chemical process of sodium gold sulfite includes:

[0054] (1) Prepare raw materials: prepare pure gold with a purity of more than 99.9%; sodium sulfite with a purity of more than 99.9%; and sodium hydroxide with a purity of more than 99.9%.

[0055] (2) Preparation of gold foil: Pure gold is cut into thin slices to prepare gold foil.

[0056] (3) Preparation of chloroauric acid: Place gold foil in a nitric acid + hydrochloric acid solution, heat to 92 degrees, stir, set the speed to 100 rpm, so that the gold foil is completely dissolved, and then use a peristaltic pump to add sodium hydroxide. The pH of the chloroauric acid solution is controlled at 4-5.

[0057] (4) Preparation of sodium sulfite solution: Dissolve sodium sulfite in water to prepare a sodium sulfite solution with a concentration of 0.32 mol / L.

[0058] (5) Preparation of sodium gold sulfite solution: Heat the sodium sulfite solution to 50 degrees, maintain this temperature, start stirring, set the speed to 100 rpm, add chloroauric acid to the sodium sulfite solution, and allow the chloroauric acid to completely react with the sodium sulfite to form a sodium gold sulfite solution. The pH of the sodium gold sulfite solution is controlled at 8-9.

[0059] (6) Preparation of sodium gold sulfite solution crystals: Add alcohol to the sodium gold sulfite solution at a volume ratio of alcohol: sodium gold sulfite solution = 4:1, and extract the sodium gold sulfite crystals.

[0060] (7) Volatilizing alcohol: The sodium gold sulfite crystals extracted with alcohol are washed and filtered twice with alcohol. After filtering, they are transferred to a tray for drying.

[0061] (8) Preparation of sodium gold sulfite solution: Add pure water (water: gold 5:1) into the reactor, pour the dried sodium gold sulfite crystals into the reactor to dissolve, add anhydrous sodium sulfite (anhydrous sodium sulfite 2:1 gold) after dissolution, add dilute sulfuric acid to adjust the pH to 8.5-9 after dissolution, and transfer to a bucket for filtration.

[0062] In the process of slowly dropping chloroauric acid into a transparent sodium sulfite solution, when the pH value of the solution in the reaction flask 1 is not around 8, the yield of sodium gold sulfite decreases. At this time, the chloroauric acid is not completely reacted, and the residual chloroauric acid will cause the reaction flask 1 to appear light yellow (chloroauric acid itself is light yellow and a strong acid). The pH value in the reaction flask 1 can be known by the color in the reaction flask 1. The darker the yellow color in the reaction flask 1, the more the pH of the solution in the reaction flask 1 decreases, and more sodium hydroxide needs to be added. However, in the prior art, the pH value is generally adjusted by directly adding sodium hydroxide. Generally speaking, the volume of a drop of liquid is about 0.05 ml, and the amount of sodium hydroxide added to the reaction flask 1 each time is fixed, and it is difficult to accurately adjust the pH value in the reaction flask 1.

[0063] By controlling the particle size of the sodium hydroxide droplets when they fall, the pH of the liquid in the reaction bottle 1 is controlled. Preferably, the pH value of the liquid in the reaction bottle 1 is controlled at about 8, so that the best yield of sodium gold sulfite can be obtained. Therefore, when chloroauric acid is slowly output through the first pump body 4, the volume of the sodium hydroxide solution to be added can be inferred according to the depth of the color in the reaction bottle 1, and then the volume of the sodium hydroxide droplets output from the second pipeline 8 is adjusted according to the droplet particle size adjustment mechanism 9, so as to quantitatively add the volume of the sodium hydroxide solution and accurately adjust the pH value in the reaction bottle 1.

[0064] Furthermore, the second pipe 8 is sleeved with a movable sleeve 801 , and the movable sleeve 801 is movably arranged up and down along the second pipe 8 , and the top end of the spring 901 is connected to the bottom surface of the movable sleeve 801 .

[0065] In this embodiment, the movable sleeve 801 can help the spring 901 to achieve better upward and downward stretching.

[0066] Furthermore, the liquid outlet end of the second pipe 8 is narrowed.

[0067] Furthermore, the spring 901 is a tower spring.

[0068] In this embodiment, the liquid outlet end of the second pipe 8 is narrowed, so that the slowly output sodium hydroxide solution can fall in the shape of water drops. The bottom of the tower spring is narrowed, so that it can better surround the liquid outlet end of the second pipe 8, and the bottom diameter of the tower spring is small, which can better attract and adsorb the sodium hydroxide droplets.

[0069] Furthermore, the spring 901 is provided with elastic rods 903 at intervals along the winding direction thereof, and the elastic rods 903 are arranged obliquely upward.

[0070] Furthermore, when the spring 901 is compressed, the elastic rod 903 is elastically deformed and mounted on the inner circle of the spring 901. When the spring 901 is stretched, the elastic rod 903 is elastically deformed and swung toward the outer circle of the spring 901 to separate the droplets output by the second pipe 8.

[0071] In this embodiment, the elastic rod 903 can increase the contact area between the spring 901 and the droplet, thereby improving the adsorption capacity of the bottom end of the spring 901 to the droplet; on the other hand, the elastic rod 903 can be a rubber material support with a certain bending elasticity. When the spring 901 is compressed, the elastic rod 903 is elastically deformed and placed on the inner circle of the spring 901. Figure 4 At this time, the elastic rod 903 and the spring 901 absorb the droplets together. When the spring 901 is further stretched, the pitch of the spring 901 increases. At this time, the elastic rod 903 is elastically deformed and swung toward the outer ring of the spring 901, as shown in FIG. Figure 5 As shown, under this structure, the droplets adsorbed on the bottom of the spring 901 can be thrown off to make them detach better.

[0072] A preparation process of a sodium gold sulfite solution is further provided, based on the preparation equipment of the sodium gold sulfite solution, comprising the following steps:

[0073] The chloroauric acid is slowly output to the sodium sulfite in the reaction bottle 1 through the first pump body 4;

[0074] Detecting the color of the reaction bottle 1 by the visual mechanism;

[0075] Control the driving member 902 to adjust the stretching amount of the spring 901 according to the color of the reaction bottle 1;

[0076] Sodium hydroxide droplets of corresponding droplet particle size are outputted through the second pump body 7 , so that the sodium hydroxide droplets fall off to the sodium sulfite in the reaction bottle 1 .

[0077] Further, detecting the color of the reaction bottle by the visual mechanism includes: detecting the yellow color of the reaction bottle by the visual mechanism and outputting a yellow depth value;

[0078] Controlling the driving member 902 to adjust the stretching amount of the spring 901 according to the color of the reaction bottle includes: controlling the driving member 902 to adjust the stretching amount of the spring 901 according to the yellow depth value, and the stretching amount is negatively correlated with the yellow depth value.

[0079] Further, after the second pump body outputs the sodium hydroxide droplets of the corresponding droplet particle size, before the sodium hydroxide droplets fall off to the sodium sulfite in the reaction bottle, the method comprises:

[0080] The spring 901 is further stretched by the driving member 902 , so that the elastic rod 903 swings toward the outer ring of the spring 901 .

[0081] The principle of this embodiment can refer to the principle of a preparation device for sodium gold sulfite solution.

[0082] Among them, the darker the yellow depth value, the more residual chloroauric acid is that has not reacted completely. At this time, the pH value in the reaction bottle 1 is lower, and more sodium hydroxide is needed for adjustment. Therefore, it is necessary to reduce the stretching amount of the spring 901 so that the bottom of the spring 901 can absorb larger droplets and then fall off.

[0083] It should be noted that in the claims, any reference signs placed between brackets shall not be construed as limiting the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claim. The word "a" or "an" preceding a component does not exclude the presence of a plurality of such components. The invention may 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 may be interpreted as names.

[0084] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0085] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0086] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms should not be understood as necessarily being directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

Claims

1. A preparation device for a sodium gold sulfite solution, characterized in that: include: A reaction flask (1) is provided with a stirring element (2), and the reaction flask (1) is used to store sodium sulfite; a first receiving bottle (3) and a first pump body (4), wherein the first receiving bottle (3) is used to store chloroauric acid, and the first pump body (4) outputs chloroauric acid to the reaction bottle (1) through a first pipeline (5); a second containing bottle (6) and a second pump body (7), wherein the second containing bottle (6) is used to store sodium hydroxide, and the second pump body (7) outputs sodium hydroxide to the reaction bottle (1) through a second pipeline (8); A droplet size adjustment mechanism (9), comprising a spring (901) and a driving member (902), wherein the bottom end of the spring (901) is fixedly connected to the liquid outlet end of the second pipe (8), the end of the spring (901) extends to the lower side of the liquid outlet end of the second pipe (8), after the liquid is discharged from the second pipe (8), the droplets are attracted to the bottom end of the spring (901) to gather and then drip, the driving member (902) is connected to the top end of the spring (901), the driving member (902) stretches or relaxes the spring (901) to change the pitch of the spring (901), and the pitch of the spring (901) is negatively correlated with the adsorption force of the spring (901) on the droplets; A visual mechanism, arranged on the side of the reaction bottle (1), for obtaining the color inside the reaction bottle (1); A control system controls the amount of stretching of the spring (901) by the driving member (902) according to the color obtained by the visual mechanism, thereby controlling the particle size of the droplets output by the second pipe (8).

2. The preparation device of a sodium gold sulfite solution according to claim 1, characterized in that: The second pipe (8) is sleeved with a movable sleeve (801), the movable sleeve (801) is movably arranged up and down along the second pipe (8), and the top end of the spring (901) is connected to the bottom surface of the movable sleeve (801).

3. The preparation equipment of a sodium gold sulfite solution according to claim 1, characterized in that: The liquid outlet end of the second pipe (8) is narrowed.

4. The preparation equipment of a sodium gold sulfite solution according to claim 1, characterized in that: The spring (901) is a tower spring.

5. The preparation equipment of a sodium gold sulfite solution according to claim 4, characterized in that: The spring (901) is provided with elastic rods (903) at intervals along the winding direction thereof, and the elastic rods (903) are arranged obliquely upwards.

6. The preparation equipment of a sodium gold sulfite solution according to claim 5, characterized in that: When the spring (901) is compressed, the elastic rod (903) is elastically deformed and mounted on the inner ring of the spring (901); when the spring (901) is stretched, the elastic rod (903) is elastically deformed and swung toward the outer ring of the spring (901), thereby separating the droplets output by the second pipe (8).

7. A preparation process for a sodium gold sulfite solution, characterized in that: The preparation device of a sodium gold sulfite solution according to claim 6 comprises the following steps: The first pump body (4) slowly outputs chloroauric acid to the sodium sulfite in the reaction bottle (1); Detecting the color of the reaction bottle (1) by means of the visual mechanism; Controlling the driving member (902) to adjust the stretching amount of the spring (901) according to the color of the reaction bottle (1); Sodium hydroxide droplets of corresponding droplet particle size are outputted through the second pump body (7), so that the sodium hydroxide droplets fall off to the sodium sulfite in the reaction bottle (1).

8. A process for preparing a sodium gold sulfite solution according to claim 7, characterized in that: Detecting the color of the reaction bottle (1) by the visual mechanism comprises: detecting the yellow color of the reaction bottle (1) by the visual mechanism, and outputting a yellow depth value; Controlling the driving member (902) to adjust the stretching amount of the spring (901) according to the color of the reaction bottle (1) includes: controlling the driving member (902) to adjust the stretching amount of the spring (901) according to the yellow depth value, and the stretching amount and the yellow depth value are negatively correlated.

9. A process for preparing a sodium gold sulfite solution according to claim 7, characterized in that: After the sodium hydroxide droplets of corresponding droplet particle size are outputted through the second pump body (7), the sodium hydroxide droplets are made to fall off before the sodium sulfite in the reaction bottle (1), comprising: The spring (901) is further stretched by the driving member (902), so that the elastic rod (903) swings toward the outer ring of the spring (901).

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