Proportioning and conveying device for production of ultra-pure silver nitrate and production process of ultra-pure silver nitrate

Abstract

The invention belongs to the technical field of solution conveying adopting valves, and particularly relates to equipment for classifying and proportioning solutions through valves, in particular to a proportioning and conveying device for production of ultra-pure silver nitrate and a production process of the proportioning and conveying device for production of the ultra-pure silver nitrate, and the proportioning and conveying device for production of the ultra-pure silver nitrate comprises a main feeding tank; an auxiliary feeding bin; a switching type delivery valve; the switching type delivery valve comprises a valve body, a valve core and a valve core, a ball valve; the driving part is used for driving the ball valve to rotate, so that the main feeding tank or the auxiliary feeding bin is communicated with the valve body through the ball valve; a residual liquid collecting groove is formed in the inner wall of the contact face of the valve body and the ball valve. The residual liquid collecting tank is arranged on the contact surface of the valve body and the ball valve, and residual liquid in the ball valve is automatically guided into the residual liquid collecting tank during switching, so that the residual quantity of a silver nitrate solution is greatly reduced, concentration fluctuation caused by mixing of trace silver nitrate during pure water conveying during repeated proportioning is avoided, and the proportioning precision error is reduced.

Description

Technical Field

[0001] The 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 ultra-pure silver nitrate (purity 99.99%), solution ratio accuracy is the key to producing ultra-pure silver nitrate.

[0003] When the proportioning and conveying device in the related technology uses a ball valve to switch the main and auxiliary liquid circuits, 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 mixed in uncontrollably, causing the actual proportion value to deviate, directly affecting the ion concentration gradient of the crystallization process, and then 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 proportioning 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 disclosed embodiments 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: A main feed tank, which is used to deliver pure water; Auxiliary feeding silo, which is used to transport silver nitrate solution; A switchable delivery valve, which is communicated with the main delivery tank and the auxiliary delivery bin respectively; Wherein, the switchable delivery valve comprises: Valve body; a ball valve disposed in the valve body; 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; Wherein, a residual liquid collecting groove is arranged 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 collecting groove.

[0008] In an optional embodiment, a connecting straight pipe is provided in the middle of the ball valve; The switchable delivery valve is provided with two working states; In the first working state, the connecting straight pipe is in a vertical state to convey silver nitrate solution and pure water; In the second working state, the connecting straight pipe is in a horizontal state to feed silver nitrate solution into the connecting straight pipe for storage.

[0009] In an optional implementation manner, the valve body includes: A first liquid inlet pipe, which is communicated with the main feeding tank; A second liquid inlet pipe, which is communicated with the auxiliary feeding bin; A liquid outlet pipe, which is communicated with an external container; Wherein, the axes of the first liquid inlet pipe and the liquid outlet pipe are collinear, and the axis of the second liquid inlet pipe is perpendicular to the axis of the liquid outlet pipe; In the first working state, the connecting straight pipe is in a vertical state to connect the first liquid inlet pipe and the liquid outlet pipe through the connecting straight pipe; In the second working state, the connecting straight pipe is in a horizontal state to connect the second liquid inlet pipe with the connecting straight pipe.

[0010] In an optional implementation manner, the residual liquid collecting tank is arranged between the second liquid inlet pipe and the liquid outlet pipe; And, 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.

[0011] In an optional implementation manner, a perforated plate is arranged at the top of the residual liquid collecting tank; A stepped groove is formed on the side of the perforated plate facing the sphere; The valve body further includes a sealing ring; The sealing ring is arranged in the stepped groove and is located between the perforated plate and the ball valve, and is used to seal the ball valve and the valve body.

[0012] In an optional implementation manner, the bottom of the residual liquid collecting tank is in a converging shape and is inclined downward; When the switching type conveying valve reciprocally switches between two working states, the sealing ring is reciprocally pushed. When the mesh holes on the stepped groove are opened, the silver nitrate solution in the residual liquid collecting tank is fed into the external container.

[0013] In an optional implementation manner, the sealing ring is in a laminated shape; 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; 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.

[0014] In an alternative embodiment, the sealing ring is made of an inert material; That is, the sealing ring is fluororubber or perfluoroether rubber.

[0015] In an alternative embodiment, the driving member includes: A driving motor for driving the ball valve to rotate; A control module configured to control the driving motor to rotate, thereby driving the ball valve to connect the main feed tank or the auxiliary feed bin with the valve body.

[0016] In a second aspect, the embodiments of the present disclosure further provide a production process of ultrapure silver nitrate, including: Cleaning the silver ingot; Reacting the silver ingot with nitric acid to prepare solution A; After adding silver oxide to solution A and stirring for reaction, neutralizing the liquid to obtain solution B with a pH above 6.5; After filtering solution B, adjusting the pH of the filtrate to 1.5 with nitric acid to obtain solution C; Using the proportioning and conveying device for producing ultrapure silver nitrate as described above to dilute solution C with pure water, standing it still, and extracting the supernatant to obtain solution D; Solution D is concentrated, centrifuged, and dried to obtain ultrapure silver nitrate.

[0017] The beneficial effect of the present invention is that, for the proportioning and conveying device for producing ultrapure silver nitrate and its production process thereof, through the residual liquid collection tank provided at the contact surface between the valve body and the ball valve, the residual liquid in the ball valve is automatically introduced into the residual liquid collection tank during switching, greatly reducing the residual amount of the silver nitrate solution, avoiding the concentration fluctuation caused by the mixing of trace amounts of silver nitrate during the pure water transportation in multiple proportionings, and thus reducing the proportioning accuracy error.

[0018] Other features and advantages of the present invention will be described in the following specification, and partly will become obvious from the specification, or will be understood by implementing the present invention. The objectives and other advantages of the present invention are achieved and obtained by the structures specifically pointed out in the specification and the drawings.

[0019] To make the above objectives, features, and advantages of the present invention more obvious and understandable, specific preferred embodiments are hereby cited and described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 Schematic structural diagram of the proportioning and conveying device for the production of ultra-pure silver nitrate provided by the embodiments of the present disclosure; Figure 2 Cross-sectional view of a partial structure of the proportioning and conveying device for the production of ultra-pure silver nitrate provided by the embodiments of the present disclosure; Figure 3 Schematic state diagram of the proportioning and conveying device for the production of ultra-pure silver nitrate provided by the embodiments of the present disclosure in the first working state; Figure 4 Schematic state diagram of the proportioning and conveying device for the production of ultra-pure silver nitrate provided by the embodiments of the present disclosure in the second working state; Figure 5 Schematic control principle diagram of the proportioning and conveying device for the production of ultra-pure silver nitrate provided by the embodiments of the present disclosure.

[0022] In the figure: 100, main feeding tank; 200, auxiliary feeding bin; 300, switching conveying valve; 310, valve body; 311, first liquid inlet pipe; 312, liquid outlet pipe; 313, second liquid inlet pipe; 320, ball valve; 321, communicating straight pipe; 330, residual liquid collection tank; 331, mesh plate; 332, stepped groove; 333, sealing ring. Specific embodiments

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0024] In this article, when it is mentioned that the first component is located on the second component, this may mean that the first component can be directly formed on the second component, or a third component can be inserted between the first component and the second component. In addition, in the drawings, for the effective description of the technical content, the thickness of the components can be exaggerated or reduced.

[0025] In this document, when an element or layer is referred to as being "on," "joined to," "connected to," "attached to," or "coupled to" another element or layer, it can be directly on, joined, connected, attached, or coupled to the other element or layer, or intervening elements or layers may be present. In contrast, when an element is referred to as being "directly on," "directly joined 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.

[0026] In this document, 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..." modify the entire list of elements when following a 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.

[0027] The terms used herein are only for describing 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 the plural forms, unless it is clearly stated otherwise in the context. The terms "comprising," "including," and "having" are inclusive and thus specify the presence of the stated features, steps, operations, elements, and / or components, but do not preclude 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 construed as necessarily requiring them to be performed in the particular order discussed or illustrated, unless specifically identified as an order of performance. Additional or alternative steps may be employed.

[0028] As used herein, phrases such as "in one embodiment," "according to one embodiment," "in some embodiments," etc. 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, the 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," etc. are used "as an example, instance, or illustration." Any embodiment, aspect, or design described herein as "example" or "exemplary" is not necessarily to be construed as preferred or superior to other embodiments, aspects, or designs. Instead, the use of the terms "example," "exemplary," etc. is intended to present concepts in a concrete manner.

[0029] It has been found through research that in the related art, improving the detection accuracy of the flow sensor is used to control the ratio. In actual use, it is found that when the accuracy is improved to a certain extent, for example, the detection accuracy of the flow sensor is 0.2% of full scale, the error of each ratio during actual production is more than 0.5% deviation, resulting in a decrease in the purity of the produced silver nitrate. The inventor has found through research that this part of the error is caused by the silver nitrate solution remaining in the valve cavity affecting the ratio accuracy.

[0030] Based on the above research, the embodiments of the present disclosure provide a ratio conveying device and its production process for producing ultra-pure silver nitrate. By providing a residual liquid collection tank 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 tank 330 during switching, greatly reducing the residual amount of the silver nitrate solution, avoiding the concentration fluctuation caused by the mixing of trace amounts of silver nitrate during the transportation of pure water during multiple ratios, and thus reducing the ratio accuracy error.

[0031] Regarding the defects existing in the above solutions, they are all the results obtained by the inventor after practice and careful research. Therefore, the discovery process of the above problems and the solutions proposed by the present disclosure in this article for the above problems should all be the contributions made by the inventor to the present disclosure during the process of the present disclosure.

[0032] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0033] The following will describe in detail some embodiments of the present invention with reference to the drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0034] Please refer to Figure 1 and Figure 2 , at least one embodiment provides a ratio conveying device for producing ultra-pure silver nitrate, including: a main feed tank 100 for conveying pure water; an auxiliary feed bin 200 for conveying silver nitrate solution; a switching conveying valve 300 respectively communicating with the main feed tank 100 and the auxiliary feed bin 200; wherein, the switching conveying valve 300 includes: a valve body 310; a ball valve 320 disposed within the valve body 310; a driving member (not shown in the figure) for driving the ball valve 320 to rotate, so that the ball valve 320 connects the main feed tank 100 or the auxiliary feed bin 200 with the valve body 310; wherein, a residual liquid collection tank 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 residual silver nitrate solution in the ball valve 320 is sent into the residual liquid collection tank 330.

[0035] By means of the residual liquid collecting tank 330 provided 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 collecting tank 330 during switching, greatly reducing the residual amount of silver nitrate solution, avoiding the concentration fluctuation caused by the mixing of trace amounts of silver nitrate during the transportation of pure water during multiple proportionings, and thus reducing the proportioning accuracy error.

[0036] Please refer to Figure 3 and Figure 4 As shown, a communicating straight pipe 321 is provided in the middle of the ball valve 320; the switching type conveying valve 300 has two working states; in the first working state, the communicating straight pipe 321 is in a vertical state to convey silver nitrate solution and pure water; in the second working state, the communicating straight pipe 321 is in a horizontal state to send the silver nitrate solution into the communicating straight pipe 321 for storage.

[0037] The vertical / horizontal dual-state design of the communicating straight pipe 321 forms a stable storage space by temporarily storing the silver nitrate solution in the communicating straight pipe 321 in the second working state, thereby reducing the acquisition error of the flow sensor and further improving the accuracy of solution proportioning.

[0038] Please refer to Figure 2 As shown, the valve body 310 includes: a first liquid inlet pipe 311, which is communicated with the main feeding tank 100; a second liquid inlet pipe 313, which is communicated with the auxiliary feeding bin 200; and a liquid outlet pipe 312, which is communicated with an external container; wherein, the axes of the first liquid inlet pipe 311 and the liquid outlet pipe 312 are collinear, and the axis of the second liquid inlet pipe 313 is perpendicular to the axis of the liquid outlet pipe 312; in the first working state, the communicating straight pipe 321 is in a vertical state to communicate the first liquid inlet pipe 311 and the liquid outlet pipe 312 through the communicating straight pipe 321, and in the second working state, the communicating straight pipe 321 is in a horizontal state to communicate the second liquid inlet pipe 313 with the communicating straight pipe 321.

[0039] The layout where the first liquid inlet pipe 311 and the liquid outlet pipe 312 are collinear and the first liquid inlet pipe 311 and the second liquid inlet pipe 313 are perpendicular optimizes the fluid path, eliminates the right-angle bending resistance of the traditional three-way valve, reduces the turbulent pressure fluctuation, and thus ensures the detection accuracy of the flow sensor in the main feeding tank 100, and further ensures the stability of solution proportioning.

[0040] Please continue to refer to Figure 2 As shown, 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 communicating straight pipe 321 to prevent liquid from remaining in the communicating straight pipe 321.

[0041] Please continue to refer to Figure 2, a mesh plate 331 is provided at the top of the residual liquid collection tank 330; a stepped groove 332 is formed on the side of the mesh plate 331 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. By providing the stacked sealing ring 333 and the mesh plate 331 on the stepped groove 332, a dynamic sealing effect is generated when the ball valve 320 rotates, and when the connecting straight pipe 321 is in a horizontal state, the sealing performance between the ball valve 320 and the valve body 310 can be enhanced.

[0042] Wherein, the bottom of the residual liquid collection tank 330 is inclined downward in a converging shape; when the switching type conveying valve 300 reciprocally switches between two working states, the sealing ring 333 is reciprocally pushed, and when the mesh holes on the stepped groove 332 are opened, the silver nitrate solution in the residual liquid collection tank 330 is sent into an external container.

[0043] Specifically, 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 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 to close the mesh holes on the stepped groove 332.

[0044] The sealing ring 333 generates an adaptive deformation during compression and rebound, compensating for the assembly gap between the ball valve 320 and the valve body 310, and improving the sealing accuracy.

[0045] It should be noted that the sealing ring 333 is made of an inert material; that is, the sealing ring 333 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.

[0046] Please refer to Figure 5 , the driving member includes: a driving motor, which is used to drive the ball valve 320 to rotate; a control module, which is configured to control the driving motor to rotate, so as to drive the ball valve 320 to connect the main feeding tank 100 or the auxiliary feeding bin 200 with the valve body 310. Through the control module, the motor can be controlled to drive the ball valve 320 to switch between the first state and the second state, and the solution ratio is carried out in multiple times, further improving the accuracy of the solution ratio.

[0047] The embodiment of the present disclosure also provides a production process of ultra-pure silver nitrate, including: Step S1, cleaning the silver ingot; Step S2, reacting the silver ingot with nitric acid to prepare solution A; Step S3: After adding silver oxide to Solution A and stirring for reaction, neutralize the liquid to obtain Solution B with a pH of 6.5 or higher. Step S4: After filtering Solution B, adjust the pH of the filtrate to 1.5 with nitric acid to obtain Solution C. Step S5: Use the above-mentioned proportioning and conveying device for producing ultrapure silver nitrate to dilute Solution C with pure water, let it stand, and then extract the supernatant to obtain Solution D. Step S6: Concentrate, centrifuge, and dry Solution D to obtain ultrapure silver nitrate.

[0048] In summary, the present invention provides a proportioning and conveying device and its production process for producing ultrapure silver nitrate, including: a main feed tank 100 for conveying pure water; an auxiliary feed bin 200 for conveying silver nitrate solution; a switching conveying valve 300 respectively communicating with the main feed tank 100 and the auxiliary feed bin 200; wherein, the switching conveying valve 300 includes: a valve body 310; a ball valve 320 disposed within the valve body 310; a driving member for driving the ball valve 320 to rotate, so that the ball valve 320 connects the main feed tank 100 or the auxiliary feed bin 200 with the valve body 310; wherein, 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. When the driving member drives the ball valve 320 to rotate, the residual silver nitrate solution in the ball valve 320 is sent to the residual liquid collecting groove 330. Through the residual liquid collecting groove 330 provided 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 collecting groove 330 during switching, greatly reducing the residual amount of silver nitrate solution, avoiding the concentration fluctuation caused by the mixing of trace amounts of silver nitrate during the conveying of pure water during multiple proportionings, and thus reducing the proportioning accuracy error. In the above discussion, unless otherwise specified, when used to describe a numerical value, the terms "about", "approximately", "substantially", etc. mean a change of + / −10% of the value.

[0049] Inspired by the above ideal embodiments of the present invention, through the above description, relevant staff can make various changes and modifications completely within the scope without departing from the technical idea of this invention. The technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A proportioning and conveying device for the production of ultra-pure silver nitrate, characterized in that, Comprising: A main feed tank (100) for conveying pure water; An auxiliary feed bin (200) for conveying silver nitrate solution; A switching conveying valve (300) which is respectively communicated with the main feed tank (100) and the auxiliary feed bin (200); Wherein, the switching conveying valve (300) comprises: A valve body (310); A ball valve (320) which is arranged inside the valve body (310); A driving member for driving the ball valve (320) to rotate, so that the ball valve (320) communicates the main feed tank (100) or the auxiliary feed bin (200) with the valve body (310); Wherein, a residual liquid collecting groove (330) is arranged 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 residual silver nitrate solution in the ball valve (320) is sent into the residual liquid collecting groove (330).

2. The proportioning and conveying device for producing ultra-pure silver nitrate according to claim 1, characterized in that A communicating straight pipe (321) is arranged in the middle of the ball valve (320); The switching conveying valve (300) has two working states; In the first working state, the communicating straight pipe (321) is in a vertical state to convey silver nitrate solution and pure water; In the second working state, the communicating straight pipe (321) is in a horizontal state to send silver nitrate solution into the communicating straight pipe (321) for storage.

3. The proportioning and conveying device for producing ultra-pure silver nitrate according to claim 2, characterized in that The valve body (310) comprises: A first liquid inlet pipe (311) which is communicated with the main feed tank (100); A second liquid inlet pipe (313) which is communicated with the auxiliary feed bin (200); A liquid outlet pipe (312) which is communicated with an external container; Wherein, the axes of the first liquid inlet pipe (311) and the liquid outlet pipe (312) are collinear, and the axis of the second liquid inlet pipe (313) is perpendicular to the axis of the liquid outlet pipe (312); In the first working state, the communicating straight pipe (321) is in a vertical state to communicate the first liquid inlet pipe (311) and the liquid outlet pipe (312) through the communicating straight pipe (321); In the second working state, the communicating straight pipe (321) is in a horizontal state to communicate the second liquid inlet pipe (313) with the communicating straight pipe (321).

4. The proportioning and conveying device for producing ultra-pure silver nitrate according to claim 3, characterized in that The residual liquid collecting groove (330) is arranged between the second liquid inlet pipe (313) and the liquid outlet pipe; And, the length of the residual liquid collecting groove (330) is greater than the diameter of the communicating straight pipe (321) to avoid liquid remaining in the communicating straight pipe (321).

5. The proportioning and conveying device for producing ultra-pure silver nitrate according to claim 2, characterized in that A mesh plate (331) is arranged at the top of the residual liquid collecting groove (330); A stepped groove (332) is arranged on the surface of the mesh plate (331) facing the sphere; The valve body (310) further comprises 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).

6. The proportioning and conveying device for producing ultra-pure silver nitrate according to claim 5, characterized in that The bottom of the waste liquid collection tank (330) is arranged in a converging shape and slopes downward. When the switching conveying valve (300) reciprocally switches between two working states, it reciprocally pushes the sealing ring (333). When the mesh holes on the stepped groove (332) are opened, the silver nitrate solution in the waste liquid collection tank (330) is sent into an external container.

7. The proportioning and conveying device for producing ultra-pure silver nitrate according to claim 5, characterized in that The sealing ring (333) is in a laminated 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 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) to close the mesh holes on the stepped groove (332).

8. The proportioning and conveying device for producing ultra-pure silver nitrate according to claim 7, characterized in that The sealing ring (333) is made of an inert material. That is, the sealing ring (333) is fluororubber or perfluoroether rubber.

9. The proportioning and conveying device for producing ultra-pure silver nitrate according to claim 1, characterized in that The driving member includes: A driving motor, which is used to drive the rotation of the ball valve (320). A control module, which is configured to control the driving motor to rotate, so as to drive the ball valve (320) to connect the main feeding tank (100) or the auxiliary feeding bin (200) with the valve body (310).

10. A production process of ultra-pure silver nitrate, characterized in that, Including: Cleaning the silver ingot. Reacting the silver ingot with nitric acid to prepare solution A. Adding silver oxide to solution A, stirring and reacting, and then neutralizing the liquid to obtain solution B with a pH above 6.

5. Filtering solution B, and adjusting the pH of the filtrate to 1.5 with nitric acid to obtain solution C. Using the proportioning and conveying device for producing ultra-pure silver nitrate according to claim 1 to dilute solution C with pure water, standing it, and then extracting the supernatant to obtain solution D. Solution D is concentrated, centrifuged, and dried to obtain ultra-pure silver nitrate.

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