A sodium pyroantimonate crystallization device

Abstract

The application provides a sodium pyroantimonate crystallization device, and relates to the technical field of crystallization. The device comprises a first crystallizer, a second crystallizer and a third crystallizer. The discharge port of the first crystallizer is connected with the feed port of the second crystallizer through a first pipeline. The discharge port of the second crystallizer is connected with the feed port of the third crystallizer through a second pipeline. The first pipeline and the second pipeline are both provided with a filter box and a quark valve in sequence along the flowing direction of the crystallization liquid. The filter box is provided with a filter assembly for intercepting solid crystallization substances in the crystallization liquid. Compared with the prior art, the filter box and the quark valve are arranged in sequence along the flowing direction of the crystallization liquid on the connecting pipeline. The filter assembly in the filter box can intercept the solid crystallization substances in advance, effectively prevents the valve blockage problem caused by the aggregation of the solid crystallization substances at the valve core of the quark valve, and guarantees the continuity of the crystallization liquid conveying.

Description

Technical Field

[0001] This application relates to the field of crystallization technology, and more specifically, to a sodium pyroantimonate crystallization apparatus. Background Technology

[0002] Sodium pyroantimonate is a key raw material in fields such as flame retardants and glass clarifying agents. Its product purity and crystal particle size uniformity directly determine its application performance, and the crystallization process is the core link in controlling the above indicators.

[0003] Patent CN209405726U discloses a two-stage, three-section temperature gradient continuous crystallization device, comprising a first crystallizer, a second crystallizer, a third crystallizer, and a storage tank. Each of the first, second, and third crystallizers has an inlet at its top and an outlet at its bottom. The outlet of the first crystallizer is connected to the inlet of the second crystallizer, and the outlet of the second crystallizer is connected to the inlet of the third crystallizer. Each of the first, second, and third crystallizers has a hot and cold medium outlet at its upper end and a hot and cold medium inlet at its lower end. The storage tank has an outlet and an inlet. The outlet is connected to the hot and cold medium inlet, and the inlet is connected to the hot and cold medium outlet, allowing the hot and cold medium to circulate to the storage tank. This crystallization device is not only simple in structure and easy to operate, but also provides accurate temperature control and thorough crystallization. Furthermore, by configuring the crystallization process in three sections and combining it with a two-stage stirrer, the device achieves uniform crystallization and allows for temperature gradient control in each section to create different temperatures as needed for crystallization.

[0004] The aforementioned crystallization device is equipped with cocks at the inlet, outlet, and connection points between the crystallizers to control the flow rate of the crystallizing liquid. However, in actual operation, the crystallizing liquid needs to flow directly through the cock to the next stage crystallizer. Some of the solid crystals already formed in the previous stage crystallizer will enter the cock along with the crystallizing liquid. Due to the gap between the cock valve core and the valve seat, and the tendency for local flow rate to slow down during the opening and closing of the valve core, these solid crystals tend to gradually accumulate on the surface of the valve core or in the gap. After long-term operation, the accumulated crystals will cause the valve core to jam or the flow channel to become blocked, affecting continuous production. Summary of the Invention

[0005] The purpose of this application is to provide a sodium pyroantimonate crystallization apparatus that can solve the technical problems raised in the background art.

[0006] This application provides a sodium pyroantimonate crystallization device, including a first crystallizer, a second crystallizer, and a third crystallizer. The outlet of the first crystallizer is connected to the inlet of the second crystallizer through a first pipe, and the outlet of the second crystallizer is connected to the inlet of the third crystallizer through a second pipe. Both the first pipe and the second pipe are provided with a filter box and a quark valve in sequence along the flow direction of the crystallization liquid. The filter box is provided with a filter component for intercepting solid crystals in the crystallization liquid.

[0007] Furthermore, the filter assembly includes a filter frame and a filter element fixed on the filter frame. The filter frame is fixed inside the filter box. The filter element has a cylindrical structure. An annular flow guide cavity is formed between the inner wall of the filter box and the outer wall of the filter element. The side wall of the filter box is provided with an inlet communicating with the annular flow guide cavity. The bottom of the filter box is provided with an outlet communicating with the inner cavity of the filter element.

[0008] Furthermore, the filter element is a sintered stainless steel mesh, and the pore size of the filter element is 2-5 μm.

[0009] Furthermore, a backwash pipe is fixedly installed inside the inner cavity of the filter element, the upper end of the backwash pipe extends to the outside of the filter box, a pulse valve is provided on the backwash pipe, the pulse valve is located outside the filter box, and multiple backwash nozzles are evenly arranged along the circumference of the backwash pipe wall.

[0010] Furthermore, the side wall of the filter box is provided with a discharge port that communicates with the annular guide cavity, and the discharge port is covered with a sealing cap.

[0011] Furthermore, the first crystallizer, the second crystallizer, and the third crystallizer each include a crystallization chamber body, a jacket layer, and a stirring assembly. The jacket layer wraps around the outside of the crystallization chamber body, and the stirring assembly is vertically inserted through the axis of the crystallization chamber body. The jacket layer is respectively provided with a cooling medium inlet and a cooling medium outlet. The first crystallizer, the second crystallizer, and the third crystallizer are all provided with an infrared temperature monitoring instrument for monitoring the temperature of the crystallizing liquid inside the crystallization chamber body.

[0012] Furthermore, the stirring assembly includes a stirring shaft, a stirring paddle, and a drive motor. The stirring shaft is rotatably disposed within the crystallization chamber body, with its upper end extending outside the crystallization chamber body and connected to the output shaft of the drive motor. The stirring paddle is fixedly disposed at the lower end of the stirring shaft.

[0013] Furthermore, a discharge pipe is provided on one side of the discharge port of the first crystallizer, the second crystallizer, and the third crystallizer, and a discharge valve is provided on the discharge pipe.

[0014] The beneficial effects of this utility model are:

[0015] Compared with the prior art, this utility model has a filter box and a quark valve arranged sequentially along the flow direction of the crystallizing liquid on the connecting pipeline. The filter components in the filter box can intercept solid crystals in advance, effectively preventing the valve blockage caused by the accumulation of solid crystals at the valve core of the quark valve, and ensuring the continuity of crystallizing liquid transportation. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 These are schematic diagrams of structures in some embodiments of this application;

[0018] Figure 2 for Figure 1 Enlarged structural diagram at point A in the middle;

[0019] The reference numerals in the attached figures are as follows:

[0020] 1. First crystallizer; 2. Second crystallizer; 3. Third crystallizer; 4. First pipe; 5. Second pipe; 6. Filter box; 61. Liquid inlet; 62. Liquid outlet; 63. Discharge outlet; 7. Quark valve; 8. Filter assembly; 81. Filter frame; 82. Filter element; 9. Backwash pipe; 10. Pulse valve; 11. Sealing cover; 12. Crystallization chamber body; 13. Jacket layer; 131. Cooling medium inlet; 132. Cooling medium outlet; 14. Stirring assembly; 141. Stirring shaft; 142. Stirring paddle; 143. Drive motor; 15. Infrared temperature monitor; 16. Discharge pipe; 17. Discharge valve; 18. Discharge valve. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0026] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Specific implementation examples:

[0028] like Figure 1 and Figure 2As shown, this application provides a sodium pyroantimonate crystallization apparatus, including a first crystallizer 1, a second crystallizer 2, and a third crystallizer 3. The outlet of the first crystallizer 1 is connected to the inlet of the second crystallizer 2 via a first pipe 4, and the outlet of the second crystallizer 2 is connected to the inlet of the third crystallizer 3 via a second pipe 5. Both the first pipe 4 and the second pipe 5 are sequentially equipped with a filter box 6 and a quark valve 7 along the flow direction of the crystallizing liquid. The filter box 6 contains a filter assembly 8 for trapping solid crystals in the crystallizing liquid. In use, the sodium pyroantimonate crystallizing liquid first enters the first crystallizer 1 for preliminary crystallization, then is transported through the first pipe 4 to the second crystallizer 2 for secondary crystallization, and finally enters the third crystallizer 3 through the second pipe 5 for deep crystallization. Gradient crystallization: During the flow of the crystallizing liquid along the first pipe 4 and the second pipe 5, it first flows through the filter box 6. The filter components 8 inside the box trap the solid crystals that have already formed in the crystallizing liquid, preventing the solid crystals from entering the subsequent quark valve 7 with the liquid flow. Then, the quark valve 7 precisely controls the delivery speed of the crystallizing liquid, so that the crystallizing liquid enters the next stage crystallizer at a flow rate that meets the process requirements of each crystallizer, and finally completes the full-process gradient crystallization. Compared with the existing technology, the filter box 6 and the quark valve 7 are set sequentially along the flow direction of the crystallizing liquid on the connecting pipe. The filter components 8 inside the filter box 6 can trap the solid crystals in advance, effectively preventing the valve blockage caused by the accumulation of solid crystals at the valve core of the quark valve 7, and ensuring the continuity of the crystallizing liquid delivery.

[0029] like Figure 2 As shown, the filter assembly 8 includes a filter frame 81 and a filter element 82 fixed on the filter frame 81. The filter frame 81 is fixed inside the filter box 6. The filter element 82 has a cylindrical structure. An annular flow guide cavity is formed between the inner wall of the filter box 6 and the outer wall of the filter element 82. The side wall of the filter box 6 is provided with an inlet 61 that communicates with the annular flow guide cavity. The bottom of the filter box 6 is provided with an outlet 62 that communicates with the inner cavity of the filter element 82. After the crystallizing liquid enters the annular flow guide cavity from the inlet 61 on the side wall of the filter box 6, it is evenly distributed along the flow guide cavity and permeates into the inner cavity through the outer wall of the cylindrical filter element 82. During this process, the filter element 82 intercepts the solid crystals in the crystallizing liquid. The filtered crystallizing liquid flows out through the outlet 62 at the bottom of the filter box 6 that communicates with the inner cavity of the filter element 82. The cylindrical structure of the filter element 82 increases the filtration area, reduces flow resistance while ensuring the interception effect, and reduces the energy consumption for transporting the crystallizing liquid.

[0030] like Figure 2 As shown, the filter element 82 is a stainless steel sintered mesh with a pore size of 2-5 μm. Using a stainless steel sintered mesh as the filter element 82 can prevent the filter material from rusting and contaminating the crystallization liquid, ensuring product purity. The pore size of 2-5 μm can effectively trap solid crystals and prevent them from entering the quark valve 7 and causing blockage, while also preventing the crystallization liquid from increasing the flow resistance due to excessively small pores. This balances the filtration effect and the crystallization liquid delivery efficiency. Specifically, the pore size of the filter element 82 is 3 μm.

[0031] like Figure 2 As shown, a backwash pipe 9 is fixed inside the inner cavity of the filter element 82. The upper end of the backwash pipe 9 extends to the outside of the filter box 6. A pulse valve 10 is provided on the backwash pipe 9. The pulse valve 10 is located outside the filter box 6. Multiple backwash nozzles are evenly arranged along the circumference of the backwash pipe 9. Specifically, the outer end of the backwash pipe 9 is connected to a high-pressure hot water source. The pulse valve 10 is electrically connected to a PLC controller. The high-pressure hot water source provides the backwash medium. The PLC controller can control the pulse valve 10 to open and close periodically according to a preset program, so that the high-pressure hot water is sprayed out from the backwash nozzles in a pulse form, which is suitable for the needs of continuous industrial production. The external high-pressure hot water source can not only efficiently remove crystals, but also use the hot water temperature (5-10℃ higher than the crystallization temperature) to inhibit the secondary crystallization of crystals on the surface of the filter element 82, thereby improving the backwashing effect.

[0032] like Figure 2 As shown, the side wall of the filter box 6 has a discharge port 63 that communicates with the annular guide cavity, and a sealing cover 11 is provided at the discharge port 63. Specifically, the discharge port 63 has an external thread, and the sealing cover 11 has three internal threads that are compatible with the external thread. The sealing cover 11 is threadedly connected to the discharge port 63. Under normal filtration conditions, the sealing cover 11 is screwed into the external thread of the discharge port 63 through the internal thread to seal the discharge port 63, ensuring that the crystallizing liquid only flows in the annular guide cavity and is filtered by the filter element 82. When it is necessary to clean the solid crystals accumulated in the annular guide cavity, the entire device stops operating and there is no crystallizing liquid output from the previous crystallizer. At this time, the sealing cover 11 can be loosened to separate the threaded connection, open the discharge port 63, and discharge the residual crystals in the annular guide cavity along with a small amount of crystallizing liquid. After cleaning, the sealing cover 11 is tightened again to restore the sealing state of the filter box 6 to continue the filtration operation. The solid crystals from the previous crystallizer can also be discharged through the discharge port 63.

[0033] like Figure 1As shown, the first crystallizer 1, the second crystallizer 2, and the third crystallizer 3 each include a crystallization chamber body 12, a jacket layer 13, and a stirring assembly 14. The jacket layer 13 wraps around the outside of the crystallization chamber body 12, and the stirring assembly 14 is vertically inserted through the axis of the crystallization chamber body 12. The jacket layer 13 is respectively provided with a cooling medium inlet 131 and a cooling medium outlet 132. The first crystallizer 1, the second crystallizer 2, and the third crystallizer 3 are all provided with an infrared temperature monitor 15 for monitoring the temperature of the crystallization liquid in the crystallization chamber body 12. Specifically, each crystallizer is connected to a cooling medium input source through a corresponding cooling medium inlet 131. The cooling medium source inputs cooling medium into the jacket layer 13. The cooling medium exchanges heat with the crystallization liquid through the flow of the cooling medium in the jacket layer 13 to regulate the temperature. The monitoring probe of the infrared temperature monitor 15 extends to the crystallization chamber body. Inside the crystallizer 12, the infrared temperature monitor 15 is electrically connected to the controller, which is electrically connected to the human-machine interface. The crystallization chamber 12 carries the sodium pyroantimonate crystallizing liquid. The jacket layer 13 is connected to the corresponding cooling medium input source through the cooling medium inlet 131. The cooling medium flows in the jacket layer 13 and exchanges heat with the crystallizing liquid to regulate the temperature. The stirring component 14 stirs at the axis of the crystallization chamber 12 to make the temperature of the crystallizing liquid uniform. The infrared temperature monitor 15 of each crystallizer collects the temperature of the crystallizing liquid in real time through the probe extending into the crystallization chamber 12 and transmits the data to the controller. The temperature data is visualized and the control command is input through the human-machine interface, thereby adjusting the cooling medium supply of each crystallizer. The cooling medium inlet 131 is equipped with a solenoid valve, which is electrically connected to the controller.

[0034] like Figure 1 As shown, the stirring assembly 14 includes a stirring shaft 141, a stirring paddle 142, and a drive motor 143. The stirring shaft 141 is rotatably disposed inside the crystallization chamber body 12. The upper end of the stirring shaft 141 extends outside the crystallization chamber body and is connected to the output shaft of the drive motor 143. The stirring paddle 142 is fixedly disposed at the lower end of the stirring shaft 141. The drive motor 143 is electrically connected to the controller. The drive motor 143 drives the stirring shaft 141 to rotate the stirring paddle 142, thereby stirring the crystallization liquid inside the crystallization chamber body 12.

[0035] like Figure 1 As shown, the discharge ports of the first crystallizer 1, the second crystallizer 2, and the third crystallizer 3 are connected to a discharge pipe 16, and a discharge valve 17 is provided on the discharge pipe 16. Among them, the discharge port of the third crystallizer 3 is provided with a discharge valve 18. During normal crystallization, the discharge valve 17 on the discharge pipe 16 is in the closed state. When the corresponding pipe is blocked, the discharge valve 17 can be opened to transfer the crystallized liquid in the corresponding crystallizer, which is convenient for later maintenance.

[0036] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A sodium pyroantimonate crystallization apparatus, characterized in that: It includes a first crystallizer, a second crystallizer, and a third crystallizer. The outlet of the first crystallizer is connected to the inlet of the second crystallizer through a first pipe. The outlet of the second crystallizer is connected to the inlet of the third crystallizer through a second pipe. Both the first pipe and the second pipe are equipped with a filter box and a quark valve in sequence along the flow direction of the crystallizing liquid. The filter box is equipped with a filter component for intercepting solid crystals in the crystallizing liquid.

2. The sodium pyroantimonate crystallization apparatus according to claim 1, characterized in that: The filtration assembly includes a filter frame and a filter element fixed on the filter frame. The filter frame is fixed inside the filter box. The filter element has a cylindrical structure. An annular flow guide cavity is formed between the inner wall of the filter box and the outer wall of the filter element. The side wall of the filter box is provided with an inlet that communicates with the annular flow guide cavity. The bottom of the filter box is provided with an outlet that communicates with the inner cavity of the filter element.

3. The sodium pyroantimonate crystallization apparatus according to claim 2, characterized in that: The filter element is a sintered stainless steel mesh, and the pore size of the filter element is 2-5 μm.

4. The sodium pyroantimonate crystallization apparatus according to claim 2, characterized in that: A backwash pipe is fixed inside the inner cavity of the filter element. The upper end of the backwash pipe extends to the outside of the filter box. A pulse valve is provided on the backwash pipe. The pulse valve is located outside the filter box. Multiple backwash nozzles are evenly arranged along the circumference of the pipe wall of the backwash pipe.

5. The sodium pyroantimonate crystallization apparatus according to claim 2, characterized in that: The filter box has a discharge port on its side wall that communicates with the annular flow guide cavity, and the discharge port is covered with a sealing cap.

6. The sodium pyroantimonate crystallization apparatus according to claim 1, characterized in that: The first, second, and third crystallizers each include a crystallization chamber body, a jacket layer, and a stirring assembly. The jacket layer wraps around the outside of the crystallization chamber body, and the stirring assembly is vertically inserted through the axis of the crystallization chamber body. The jacket layer is provided with a cooling medium inlet and a cooling medium outlet, respectively. The first, second, and third crystallizers are each equipped with an infrared temperature monitoring instrument for monitoring the temperature of the crystallization liquid inside the crystallization chamber body.

7. The sodium pyroantimonate crystallization apparatus according to claim 6, characterized in that: The stirring assembly includes a stirring shaft, a stirring paddle, and a drive motor. The stirring shaft is rotatably disposed within the crystallization chamber. The upper end of the stirring shaft extends outside the crystallization chamber and is connected to the output shaft of the drive motor. The stirring paddle is fixed to the lower end of the stirring shaft.

8. The sodium pyroantimonate crystallization apparatus according to claim 1, characterized in that: The first, second, and third crystallizers have discharge pipes connected to one side of their outlets, and discharge valves are installed on the discharge pipes.

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