Proportioning and conveying device for producing ultrapure silver nitrate and its production process

Abstract

The present invention belongs to the technical field of solution delivery using a valve body, and specifically relates to an apparatus for classifying and proportioning solutions using a valve body, and more particularly to a proportioning and conveying device for producing ultrapure silver nitrate and a production process thereof. The proportioning and conveying device for producing ultrapure silver nitrate comprises: a main feed tank; an auxiliary feed silo; and a switching delivery valve. The switching delivery valve comprises: a valve body; a ball valve; and a driver for driving the ball valve to rotate, thereby causing the ball valve to connect the main feed tank or the auxiliary feed silo with the valve body. A residual liquid collection groove is provided on the inner wall of the contact surface between the valve body and the ball valve. The residual liquid collection groove provided on the contact surface between the valve body and the ball valve automatically directs residual liquid in the ball valve into the residual liquid collection groove during switching, significantly reducing the residual amount of silver nitrate solution, avoiding concentration fluctuations caused by the incorporation of trace amounts of silver nitrate into pure water during multiple proportioning, and thus reducing proportioning accuracy errors.

Description

Technical Field

[0001] The present invention belongs to the technical field of solution delivery using a valve body, and specifically relates to a device for classifying and proportioning solutions through a valve body, and more particularly to a proportioning and conveying device for producing ultrapure silver nitrate and a production process thereof. Background Art

[0002] In the industrial production of ultrapure silver nitrate (purity 99.99%), solution ratio accuracy is the key to producing ultrapure silver nitrate.

[0003] When the proportioning and conveying device in the related art uses a ball valve to switch the main and auxiliary liquid lines, the residual liquid in the valve chamber and the flow channel is prone to the following problems: when the silver nitrate solution and pure water are alternately conveyed, the residual liquid is uncontrollably mixed in, causing the actual proportion value to deviate, directly affecting the ion concentration gradient of the crystallization process, and thus affecting the purity of the subsequent ultra-pure silver nitrate.

[0004] Therefore, how to reduce the influence of the residual liquid in the valve cavity on the ratio accuracy of the silver nitrate solution is a technical problem that needs to be solved urgently.

[0005] It should be noted that the above information disclosed in this background technology section is only used to understand the background technology of the present application concept, and therefore, the above description is not considered to constitute information of the prior art. Summary of the Invention

[0006] The embodiments of the present disclosure at least provide a proportioning and conveying device for producing ultrapure silver nitrate and a production process thereof.

[0007] In a first aspect, an embodiment of the present disclosure provides a proportioning and conveying device for producing ultrapure silver nitrate, comprising:

[0008] Main feeding tank, which is used to transport pure water;

[0009] Auxiliary feeding silo, which is used to transport silver nitrate solution;

[0010] a switching delivery valve, which is connected to the main feeding tank and the auxiliary feeding silo respectively;

[0011] Wherein, the switching delivery valve includes:

[0012] Valve body;

[0013] a ball valve disposed in the valve body;

[0014] A driving member, which is used to drive the ball valve to rotate, so that the ball valve connects the main feeding tank or the auxiliary feeding silo with the valve body;

[0015] Wherein, a residual liquid collection groove is provided on the inner wall of the contact surface between the valve body and the ball valve, and when the driving member drives the ball valve to rotate, the silver nitrate solution remaining in the ball valve is sent to the residual liquid collection groove.

[0016] In an optional embodiment, a connecting straight pipe is opened in the middle of the ball valve;

[0017] The switchable delivery valve is provided with two working states;

[0018] In the first working state, the connecting straight pipe is in a vertical state, transporting the silver nitrate solution and pure water;

[0019] In the second working state, the communicating straight tube is in a horizontal state, and the silver nitrate solution is fed into the communicating straight tube for storage.

[0020] In an optional embodiment, the valve body includes:

[0021] a first liquid inlet pipe, which is connected to the main feeding tank;

[0022] a second liquid inlet pipe, which is connected to the auxiliary feed bin;

[0023] a liquid outlet pipe, connected to an external container;

[0024] The axes of the first liquid inlet pipe and the liquid outlet pipe are collinear, and the second liquid inlet pipe is arranged perpendicular to the axis of the liquid outlet pipe;

[0025] In the first working state, the connecting straight pipe is in a vertical state, and the first liquid inlet pipe and the liquid outlet pipe are connected through the connecting straight pipe;

[0026] In the second working state, the connecting straight pipe is in a horizontal state, connecting the second liquid inlet pipe with the connecting straight pipe.

[0027] In an optional embodiment, the residual liquid collection tank is arranged between the second liquid inlet pipe and the liquid outlet pipe;

[0028] Furthermore, the length of the residual liquid collecting tank is greater than the diameter of the connecting straight pipe to prevent liquid from remaining in the connecting straight pipe.

[0029] In an optional embodiment, a mesh plate is provided on the top of the residual liquid collection tank;

[0030] The mesh plate has a stepped groove on one side facing the sphere;

[0031] The valve body further includes a sealing ring;

[0032] The sealing ring is arranged in the stepped groove and is located between the mesh plate and the ball valve, and is used to seal the ball valve and the valve body.

[0033] In an optional embodiment, the bottom of the residual liquid collecting tank is arranged to be closed and tilted downward;

[0034] When the switching delivery valve switches back and forth between the two working states, the sealing ring is pushed back and forth, and when the mesh holes on the stepped groove are opened, the silver nitrate solution in the residual liquid collection tank is delivered to the external container.

[0035] In an optional embodiment, the sealing ring is in a laminated shape;

[0036] When the ball valve switches from the first working state to the second working state, the ball valve compresses the sealing ring to open the mesh holes on the stepped groove;

[0037] When the ball valve switches from the second working state to the first working state, the ball valve pulls the sealing ring to close the mesh holes on the stepped groove.

[0038] In an optional embodiment, the sealing ring is made of an inert material;

[0039] That is, the sealing ring is made of fluorine rubber or perfluoroether rubber.

[0040] In an optional embodiment, the driving member includes:

[0041] A driving motor, which is used to drive the ball valve to rotate;

[0042] The control module is configured to control the rotation of the driving motor, thereby driving the ball valve to connect the main feeding tank or the auxiliary feeding bin with the valve body.

[0043] In a second aspect, the present disclosure also provides a process for producing ultrapure silver nitrate, comprising:

[0044] Cleaning of silver ingots;

[0045] The silver ingot is reacted with nitric acid to prepare solution A;

[0046] After adding silver oxide to solution A and stirring for reaction, the liquid is neutralized to obtain solution B with a pH of more than 6.5;

[0047] After filtering solution B, the filtrate was adjusted to pH 1.5 with nitric acid to obtain solution C;

[0048] Using the aforementioned proportioning and conveying device for producing ultrapure silver nitrate, solution C was diluted with pure water and allowed to stand, and the supernatant was extracted to obtain solution D;

[0049] Solution D is concentrated, centrifuged and dried to obtain ultrapure silver nitrate.

[0050] The beneficial effect of the present invention is that the proportioning and conveying device for the production of ultra-pure silver nitrate and the production process thereof, through the residual liquid collection tank provided on the contact surface between the valve body and the ball valve, automatically introduces the residual liquid in the ball valve into the residual liquid collection tank during switching, thereby greatly reducing the residual amount of the silver nitrate solution, avoiding concentration fluctuations caused by the mixing of trace amounts of silver nitrate when pure water is conveyed during multiple proportioning, and thus reducing the proportioning accuracy error.

[0051] Other features and advantages of the present invention will be described in the following description, and in part will 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.

[0052] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are specifically cited herein and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0054] Figure 1 A schematic diagram of the structure of a proportioning and conveying device for producing ultrapure silver nitrate provided in an embodiment of the present disclosure;

[0055] Figure 2 A cross-sectional view of a portion of the structure of a proportioning and conveying device for producing ultrapure silver nitrate provided in an embodiment of the present disclosure;

[0056] Figure 3 A schematic diagram of the state of the proportioning and conveying device for producing ultrapure silver nitrate provided by an embodiment of the present disclosure in a first working state;

[0057] Figure 4 A schematic diagram of the state of the proportioning and conveying device for producing ultrapure silver nitrate provided by an embodiment of the present disclosure in the second working state;

[0058] Figure 5 This is a control principle diagram of the proportioning and conveying device for producing ultra-pure silver nitrate provided in an embodiment of the present disclosure;.

[0059] In the figure: 100, main feeding tank; 200, auxiliary feeding silo; 300, switching feeding valve; 310, valve body; 311, first liquid inlet pipe; 312, liquid outlet pipe; 313, second liquid inlet pipe; 320, ball valve; 321, connecting straight pipe; 330, residual liquid collecting tank; 331, mesh plate; 332, stepped groove; 333, sealing ring. DETAILED DESCRIPTION

[0060] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0061] In this document, when it is mentioned that a first component is located on a second component, this may mean that the first component may be directly formed on the second component, or that a third component may be interposed between the first component and the second component. In addition, in the drawings, the thickness of components may be exaggerated or reduced in order to effectively describe technical content.

[0062] As used herein, when an element or layer is referred to as being "located on," "engaged to," "connected to," "attached to," or "coupled to" another element or layer, it may be directly located on, engaged, connected, attached to, or coupled to the other element or layer, or there may be intervening elements or layers. Conversely, when an element is referred to as being "directly on," "directly engaged to," "directly connected to," "directly attached to," or "directly coupled to" another element or layer, there may be no intervening elements or layers. Other words used to describe the relationship between elements should be interpreted in a similar manner (e.g., "between" versus "directly between," "adjacent" versus "directly adjacent," etc.). As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0063] Herein, example embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as "at least one of..." when following a list of elements modify the entire list of elements, rather than modifying individual elements in the list. For example, the expression "at least one of a, b, and c" should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0064] The terms used herein are only used to describe specific exemplary configurations and are not intended to be limiting. As used herein, the singular articles "a", "an" and "the" may also be intended to include plural forms, unless otherwise clearly indicated herein. The terms "comprise", "include" and "have" are inclusive and therefore specify the presence of features, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components and / or combinations thereof. The method steps, processes and operations described herein should not be interpreted as necessarily requiring them to be performed in the particular order discussed or shown, unless specifically identified as an execution order. Additional or alternative steps may be adopted.

[0065] As used herein, the phrases "in one embodiment," "according to one embodiment," "in some embodiments," and the like generally refer to the fact that the particular feature, structure, or characteristic following the phrase may be included in at least one embodiment of the present disclosure. Thus, a particular feature, structure, or characteristic may be included in more than one embodiment of the present disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms "example," "exemplary," and the like are used to "serve as an example, instance, or illustration." Any implementation, aspect, or design described herein as "example" or "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations, aspects, or designs. Instead, the use of the terms "example," "exemplary," and the like is intended to present concepts in a concrete manner.

[0066] Research has revealed that prior art methods for controlling the mixing ratio by improving the flow sensor's accuracy have shown that, in practice, even when accuracy is improved to a certain level—for example, a flow sensor with an accuracy of 0.2% of full scale—the error in the mixing ratio during actual production can exceed 0.5%, resulting in reduced silver nitrate purity. The inventors have discovered that this error is due to residual silver nitrate solution in the valve chamber, which affects the mixing accuracy.

[0067] Based on the above research, the embodiment of the present disclosure provides a proportioning and conveying device for the production of ultra-pure silver nitrate and its production process. By setting a residual liquid collection tank 330 on the contact surface of the valve body 310 and the ball valve 320, the residual liquid in the ball valve 320 is automatically introduced into the residual liquid collection tank 330 during switching, so that the residual amount of silver nitrate solution is greatly reduced, avoiding concentration fluctuations caused by the mixing of trace silver nitrate when pure water is conveyed during multiple proportioning, thereby reducing the proportioning accuracy error.

[0068] The defects in the above solutions are the results obtained by the inventors after practice and careful research. Therefore, the discovery process of the above problems and the solutions proposed by the present disclosure in this article should be the contributions made by the inventors to the present disclosure during the disclosure process.

[0069] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0070] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features therein may be combined with each other.

[0071] See also Figure 1 and Figure 2 At least one embodiment provides a proportioning and conveying device for the production of ultra-pure silver nitrate, comprising: a main feeding tank 100, which is used to convey pure water; an auxiliary feeding silo 200, which is used to convey silver nitrate solution; a switching conveying valve 300, which is connected to the main feeding tank 100 and the auxiliary feeding silo 200 respectively; wherein, the switching conveying valve 300 comprises: a valve body 310; a ball valve 320, which is arranged in the valve body 310; a driving member (not shown), which is used to drive the ball valve 320 to rotate, so that the ball valve 320 connects the main feeding tank 100 or the auxiliary feeding silo 200 with the valve body 310; wherein, a residual liquid collection groove 330 is provided on the inner wall of the contact surface between the valve body 310 and the ball valve 320, and when the driving member drives the ball valve 320 to rotate, the silver nitrate solution remaining in the ball valve 320 is conveyed to the residual liquid collection groove 330.

[0072] By setting the residual liquid collection groove 330 on the contact surface between the valve body 310 and the ball valve 320, the residual liquid in the ball valve 320 is automatically introduced into the residual liquid collection groove 330 during switching, so that the residual amount of silver nitrate solution is greatly reduced, avoiding the concentration fluctuation caused by the mixing of trace amounts of silver nitrate when pure water is transported during multiple proportioning, thereby reducing the proportioning accuracy error.

[0073] See also Figure 3 and Figure 4 A connecting straight pipe 321 is opened in the middle of the ball valve 320; the switching delivery valve 300 is provided with two working states; in the first working state, the connecting straight pipe 321 is in a vertical state, and the silver nitrate solution and pure water are transported; in the second working state, the connecting straight pipe 321 is in a horizontal state, and the silver nitrate solution is sent into the connecting straight pipe 321 for storage.

[0074] The vertical / horizontal dual-state design of the connecting straight tube 321 temporarily stores the silver nitrate solution in the connecting straight tube 321 in the second working state to form a stable storage space, thereby reducing the collection error of the flow sensor and further improving the accuracy of the solution ratio.

[0075] See also Figure 2 The valve body 310 includes: a first liquid inlet pipe 311, which is connected to the main feeding tank 100; a second liquid inlet pipe 313, which is connected to the auxiliary feeding bin 200; and a liquid outlet pipe 312, which is connected to the external container; wherein, the axes of the first liquid inlet pipe 311 and the liquid outlet pipe 312 are collinear, and the second liquid inlet pipe 313 is arranged perpendicular to the axis of the liquid outlet pipe 312; in the first working state, the connecting straight pipe 321 is in a vertical state, and the first liquid inlet pipe 311 and the liquid outlet pipe 312 are connected through the connecting straight pipe 321; in the second working state, the connecting straight pipe 321 is in a horizontal state, and the second liquid inlet pipe 313 is connected to the connecting straight pipe 321.

[0076] The layout in which the first liquid inlet pipe 311 and the liquid outlet pipe 312 are colinear and the first liquid inlet pipe 311 and the second liquid inlet pipe 313 are perpendicular optimizes the fluid path, eliminates the right-angle bend resistance of the traditional three-way valve, reduces turbulent pressure fluctuations, and thereby ensures the detection accuracy of the flow sensor in the main feeding tank 100, thereby ensuring the stability of the solution ratio.

[0077] Please continue reading Figure 2 The residual liquid collecting tank 330 is arranged between the second liquid inlet pipe 313 and the liquid outlet pipe 312; and the length of the residual liquid collecting tank 330 is greater than the diameter of the connecting straight pipe 321 to prevent liquid from remaining in the connecting straight pipe 321.

[0078] Please continue reading Figure 2 The top of the residual liquid collection tank 330 is provided with a mesh plate 331; the mesh plate 331 has a stepped groove 332 on the side facing the ball. The valve body 310 also includes a sealing ring 333; the sealing ring 333 is disposed within the stepped groove 332, between the mesh plate 331 and the ball valve 320, and is used to seal the ball valve 320 from the valve body 310. The stacked sealing ring 333 and mesh plate 331 provided on the stepped groove 332 create a dynamic sealing effect when the ball valve 320 rotates, enhancing the sealing between the ball valve 320 and the valve body 310 when the connecting straight pipe 321 is horizontal.

[0079] Among them, the bottom of the residual liquid collection tank 330 is arranged to be closed and inclined downward; when the switching delivery valve 300 switches back and forth between the two working states, it pushes the sealing ring 333 back and forth, and when the mesh on the stepped groove 332 is opened, the silver nitrate solution in the residual liquid collection tank 330 is delivered to the external container.

[0080] Specifically, the sealing ring 333 is stacked; when the ball valve 320 switches from the first working state to the second working state, the ball valve 320 compresses the sealing ring 333 and opens the mesh holes on the stepped groove 332; when the ball valve 320 switches from the second working state to the first working state, the ball valve 320 pulls the sealing ring 333 and closes the mesh holes on the stepped groove 332.

[0081] The sealing ring 333 generates adaptive deformation during the compression and rebound process, compensating for the assembly gap between the ball valve 320 and the valve body 310, thereby improving the sealing accuracy.

[0082] It should be noted that the sealing ring 333 is made of an inert material, that is, fluororubber or perfluoroether rubber. Using an inert material to prepare the sealing ring 333 can prevent the sealing ring 333 from being corroded by the silver nitrate solution.

[0083] See also Figure 5 The drive element includes a drive motor for rotating the ball valve 320 and a control module configured to control the rotation of the drive motor, thereby driving the ball valve 320 to connect the main feeding tank 100 or the auxiliary feeding silo 200 with the valve body 310. The control module can control the motor to drive the ball valve 320 to switch between the first state and the second state, performing solution mixing in multiple steps, further improving the accuracy of the solution mixing.

[0084] The present disclosure also provides a process for producing ultrapure silver nitrate, comprising:

[0085] Step S1, cleaning the silver ingot;

[0086] Step S2, reacting the silver ingot with nitric acid to prepare solution A;

[0087] Step S3, adding silver oxide to solution A and stirring for reaction, then neutralizing the liquid to obtain solution B with a pH of greater than 6.5;

[0088] Step S4, after filtering solution B, the filtrate is adjusted to pH 1.5 with nitric acid to obtain solution C;

[0089] Step S5, using the aforementioned proportioning and conveying device for ultrapure silver nitrate production, dilute Solution C with pure water, let it stand, and then extract the supernatant to obtain Solution D;

[0090] Step S6: Solution D is concentrated, centrifuged, and dried to obtain ultrapure silver nitrate.

[0091] In summary, the present invention provides a proportioning and conveying device for the production of ultra-pure silver nitrate and a production process thereof, including: a main feeding tank 100, which is used to convey pure water; an auxiliary feeding silo 200, which is used to convey silver nitrate solution; a switching conveying valve 300, which is respectively connected to the main feeding tank 100 and the auxiliary feeding silo 200; wherein, the switching conveying valve 300 includes: a valve body 310; a ball valve 320, which is arranged in the valve body 310; a driving member, which is used to drive the ball valve 320 to rotate, so that the ball valve 320 connects the main feeding tank 100 or the auxiliary feeding silo 200 with the valve body 310; wherein, a residual liquid collection groove 330 is provided on the inner wall of the contact surface between the valve body 310 and the ball valve 320, and when the driving member drives the ball valve 320 to rotate, the silver nitrate solution remaining in the ball valve 320 is sent to the residual liquid collection groove 330. A residual liquid collection groove 330, located at the interface between valve body 310 and ball valve 320, automatically directs residual liquid from ball valve 320 into this groove during switching. This significantly reduces the amount of residual silver nitrate solution, preventing concentration fluctuations caused by trace amounts of silver nitrate entering the pure water during multiple batching operations, thereby reducing batching accuracy errors. In the discussion above, unless otherwise specified, when describing numerical values, the terms "approximately," "substantially," and the like represent a ±10% variation from the stated value.

[0092] With the above-described preferred embodiments of the present invention as a guide, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A proportioning and conveying device for producing ultrapure silver nitrate, characterized in that: include: A main feeding tank (100) for conveying pure water; An auxiliary feeding silo (200) for feeding silver nitrate solution; a switching delivery valve (300), which is in communication with the main delivery tank (100) and the auxiliary delivery bin (200), respectively; Wherein, the switching delivery valve (300) comprises: Valve body (310); a ball valve (320) disposed in the valve body (310); A driving member, which is used to drive the ball valve (320) to rotate, so that the ball valve (320) connects the main feeding tank (100) or the auxiliary feeding bin (200) with the valve body (310); A residual liquid collecting groove (330) is provided on the inner wall of the contact surface between the valve body (310) and the ball valve (320), and when the driving member drives the ball valve (320) to rotate, the silver nitrate solution remaining in the ball valve (320) is sent to the residual liquid collecting groove (330); A connecting straight pipe (321) is provided in the middle of the ball valve (320); The switchable delivery valve (300) is provided with two working states; In the first working state, the connecting straight pipe (321) is in a vertical state, transporting the silver nitrate solution and pure water; In the second working state, the connecting straight pipe (321) is in a horizontal state, and the silver nitrate solution is fed into the connecting straight pipe (321) for storage; A mesh plate (331) is provided on the top of the residual liquid collection tank (330); The mesh plate (331) is provided with a stepped groove (332) on a side facing the sphere; The valve body (310) further includes a sealing ring (333); The sealing ring (333) is arranged in the stepped groove (332) and is located between the mesh plate (331) and the ball valve (320), and is used to seal the ball valve (320) and the valve body (310); When the switching delivery valve (300) switches back and forth between the two working states, it pushes the sealing ring (333) back and forth to open or close the mesh on the stepped groove (332), and the sealing ring (333) is in a stacked shape.

2. The method for producing ultrapure silver nitrate according to claim 1, wherein: The valve body (310) comprises: a first liquid inlet pipe (311), which is in communication with the main feeding tank (100); A second liquid inlet pipe (313) connected to the auxiliary material feeding bin (200); a liquid outlet pipe (312), connected to an external container; The axes of the first liquid inlet pipe (311) and the liquid outlet pipe (312) are collinear, and the second liquid inlet pipe (313) is arranged perpendicular to the axis of the liquid outlet pipe (312); In the first working state, the connecting straight pipe (321) is in a vertical state, and the first liquid inlet pipe (311) and the liquid outlet pipe (312) are connected through the connecting straight pipe (321); In the second working state, the connecting straight pipe (321) is in a horizontal state, connecting the second liquid inlet pipe (313) with the connecting straight pipe (321).

3. The proportioning and conveying device for producing ultrapure silver nitrate according to claim 2, wherein: The residual liquid collecting tank (330) is arranged between the second liquid inlet pipe (313) and the liquid outlet pipe; Furthermore, the length of the residual liquid collecting tank (330) is greater than the diameter of the connecting straight pipe (321) to prevent liquid from remaining in the connecting straight pipe (321).

4. The proportioning and conveying device for producing ultrapure silver nitrate according to claim 3, wherein: The bottom of the residual liquid collecting tank (330) is arranged in a closed shape and tilted downward; When the switching delivery valve (300) switches back and forth between the two working states, it pushes the sealing ring (333) back and forth, and when the mesh on the stepped groove (332) is opened, the silver nitrate solution in the residual liquid collection groove (330) is delivered to the external container.

5. The proportioning and conveying device for producing ultrapure silver nitrate according to claim 3, wherein: The sealing ring (333) is in a stacked shape; When the ball valve (320) switches from the first working state to the second working state, the ball valve (320) compresses the sealing ring (333) to open the mesh on the stepped groove (332); When the ball valve (320) switches from the second working state to the first working state, the ball valve (320) pulls the sealing ring (333) to close the mesh on the stepped groove (332).

6. The proportioning and conveying device for producing ultrapure silver nitrate according to claim 5, wherein: The sealing ring (333) is made of an inert material; That is, the sealing ring (333) is made of fluororubber or perfluoroether rubber.

7. The proportioning and conveying device for producing ultrapure silver nitrate according to claim 1, wherein: The driving member includes: A driving motor, used for driving the ball valve (320) to rotate; The control module is configured to control the rotation of the driving motor, thereby driving the ball valve (320) to connect the main feeding tank (100) or the auxiliary feeding bin (200) with the valve body (310).

8. A process for producing ultrapure silver nitrate, characterized in that: include: Cleaning of silver ingots; The silver ingot is reacted with nitric acid to prepare solution A; After adding silver oxide to solution A and stirring for reaction, the liquid is neutralized to obtain solution B with a pH of more than 6.5; After filtering solution B, the filtrate was adjusted to pH 1.5 with nitric acid to obtain solution C; Using the proportioning and conveying device for producing ultrapure silver nitrate as claimed in claim 1, solution C is diluted with pure water and allowed to stand, and then the supernatant is extracted to obtain solution D; Solution D is concentrated, centrifuged and dried to obtain ultrapure silver nitrate.

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