Continuous crystallizer for industrial grade monoammonium phosphate

Abstract

The utility model discloses a continuous crystallizer for industrial grade monoammonium phosphate, which comprises a tank body and is characterized in that the tank body comprises a first cylinder body and a second cylinder body, the first cylinder body is arranged at the top end of the second cylinder body, the bottom end of the first cylinder body extends to the bottom end in the second cylinder body, an upper seal head is arranged at the top end of the first cylinder body, and a lower seal head is arranged at the bottom end of the second cylinder body. A central guide cylinder is arranged at the center of the bottom in the first cylinder body, the bottom end of the central guide cylinder extends into the lower sealing head, an expansion opening is formed in the bottom end of the central guide cylinder, and a mother liquor inlet pipe and a crystal mush outlet pipe are arranged at the bottom of the lower sealing head. According to the continuous crystallizer for the industrial-grade monoammonium phosphate, the horn-mouth-shaped expansion opening is additionally formed in the bottom of the inverted-cone-shaped central guide cylinder, so that stable stirring and crystallization particles are more uniform, and the subsequent centrifugal operation is stable; the tail end of the mother liquor inlet pipe is close to the center of the bottom end of the expansion opening, so that new materials entering the crystallizer can be rapidly mixed.

Description

Technical Field

[0001] The utility model relates to the field of monoammonium phosphate production, in particular to a continuous crystallizer for industrial-grade monoammonium phosphate. Background Art

[0002] In recent years, with the continuous expansion of the application market of water-soluble fertilizers and the demand for lithium iron phosphate, a new energy cathode material, the market demand for industrial-grade monoammonium phosphate has continued to increase. In order to better meet market demand, manufacturers have tried to improve the yield of the crystallization system. The production process of industrial-grade monoammonium phosphate initially adopted intermittent crystallization. This method is unstable and the crystallization yield varies greatly. With the continuous improvement of process technology and combined with production practice in recent years, a continuous crystallization process has emerged in the crystallization method, which is carried out in a continuous crystallizer.

[0003] As the market demand for industrial-grade monoammonium phosphate (MAP) increases, and seasonal demand is high, the seasonal demand will cause a sudden increase in MAP production. The existing continuous crystallizer is unable to meet the seasonal demand and maintain the stability of MAP production. In addition, industrial-grade MAP crystals are normally coarse and have a certain degree of viscosity, making them easy to stick to the wall. The wall will become thicker and thicker, thus affecting production efficiency. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide a continuous crystallizer for industrial-grade monoammonium phosphate.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] The utility model discloses a continuous crystallizer for industrial-grade monoammonium phosphate, comprising a tank body, characterized in that the tank body comprises a first cylinder and a second cylinder, the first cylinder is arranged at the top end of the second cylinder, and the bottom end of the first cylinder extends to the bottom end inside the second cylinder, the top end of the first cylinder is provided with an upper head, the bottom end of the second cylinder is provided with a lower head, a central guide tube is provided at the center of the bottom inside the first cylinder, the bottom end of the central guide tube extends into the lower head, and the bottom end is provided with an expansion port, and the bottom of the lower head is provided with a mother liquor inlet pipe and a slurry outlet pipe.

[0007] As a preferred technical solution of the present invention, the mother liquid inlet pipe extends obliquely upward into the lower head to below the expansion opening.

[0008] As an optimal technical solution of the present invention, an inner tube parallel to the inner wall of the lower head is provided inside the lower head, one end of the inner tube is connected to the slurry outlet pipe, and the other end extends to the bottom end of the lower head.

[0009] As a preferred technical solution of the present invention, the side wall of the lower head and the bottom wall of the second cylinder form an angle A, and the angle A is 45°-55°.

[0010] As a preferred technical solution of the present invention, the central guide tube is in an inverted cone shape, and its angle at point B is 1.5°-2.5°.

[0011] As a preferred technical solution of the present invention, the expansion opening is a trumpet-shaped opening, and the angle thereof at point C is 35°-45°.

[0012] As an optimal technical solution of the present invention, the outer wall of the upper head is provided with an exhaust port and a cleaning port, the outer wall of the first cylinder is provided with a phosphoric acid inlet pipe, and the bottom end of the lower head is provided with a stirring motor connecting flange.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0014] Adding a trumpet-shaped expansion port at the bottom of the inverted conical central guide tube can make the stirring and stabilizing crystal particles more uniform, thereby stabilizing the subsequent centrifugal operation and improving the finished product yield due to the uniform crystallization;

[0015] The end of the mother liquor inlet pipe is close to the center of the bottom end of the expansion port, so that the new material entering the crystallizer can be quickly mixed, achieving rapid crystallization and stable crystal form, thereby realizing stable and uniform crystal particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] In the figure: 1. Tank body; 2. First cylinder; 3. Second cylinder; 4. Upper head; 5. Lower head; 6. Center guide tube; 7. Expansion port; 8. Mother liquor inlet pipe; 9. Slurry outlet pipe; 10. Exhaust port; 11. Cleaning port; 12. Phosphoric acid inlet pipe; 13. Stirring motor connecting flange; 14. Inner pipe. DETAILED DESCRIPTION

[0019] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention and are not used to limit the present invention.

[0020] In the drawings, the same reference numerals all refer to the same components.

[0021] like Figure 1 As shown, the utility model provides a continuous crystallizer for industrial-grade monoammonium phosphate, including a tank body 1, characterized in that the tank body 1 includes a first cylinder body 2 and a second cylinder body 3, the first cylinder body 2 is arranged at the top end of the second cylinder body 3, and its bottom end extends to the bottom end inside the second cylinder body 3, the top end of the first cylinder body 2 is provided with an upper head 4, the bottom end of the second cylinder body 3 is provided with a lower head 5, a central guide tube 6 is provided at the center of the bottom of the first cylinder body 2, the bottom end of the central guide tube 6 extends into the lower head 5, and the bottom end is provided with an expansion port 7, and the bottom of the lower head 5 is provided with a mother liquor inlet pipe 8 and a slurry outlet pipe 9.

[0022] In this embodiment, the main body of the tank body 1 is composed of a first cylinder body 2, a second cylinder body 3, an upper head 4 and a lower head 5. The mother liquor used for monoammonium phosphate crystallization enters the tank body 1 from the lower head 5 through the mother liquor inlet pipe 8. The mother liquor circulates continuously from bottom to top and from inside to outside along the central guide tube 6, and reacts with other raw materials in the tank body 1 to obtain monoammonium phosphate crystals. By providing an expansion port 7 at the lower end of the central guide tube 6, the mother liquor can better enter the central guide tube 6 for circulation.

[0023] Furthermore, the mother liquid inlet pipe 8 extends obliquely upward into the lower head 5 to below the expansion opening 7 .

[0024] In this embodiment, the mother liquor inlet pipe 8 is located below the expansion port 7, which enables the mother liquor to better enter the central guide tube 6 for circulation, so that the mother liquor entering the crystallizer can be quickly mixed, achieving rapid crystallization and stable crystal form, thereby realizing stable and uniform crystal particles.

[0025] Furthermore, an inner tube 14 is provided inside the lower head 5 , one end of which is connected to the slurry outlet pipe 9 , and the other end of which extends to the bottom end inside the lower head 5 .

[0026] In this embodiment, the slurry outlet pipe 9 is connected to the inclined inner tube 14, the inner tube 14 is parallel to the tapered portion of the inner wall of the lower head 5, and the end of the inner tube 14 is close to the tapered bottom of the crystallizer, so that it can ensure that the discharged crystals are completely uniform and stable, and can also avoid blockage at the connection with the crystallizer wall (which will result in frequent cleaning and unstable production), thereby enabling stable production operation.

[0027] Furthermore, the side wall of the lower head 5 and the bottom wall of the second cylinder 3 form an angle A, and the angle A is 45°-55°.

[0028] In this embodiment, the angle A is 50°. By changing the angle, it is possible to avoid accumulation of crystallized material at the bottom of the lower head 5, which would affect the discharge or cause a large amount of accumulation and affect normal production.

[0029] Furthermore, the central guide tube 6 is in an inverted cone shape, and the angle thereof at point B is 1.5°-2.5°.

[0030] Furthermore, the expansion opening 7 is a trumpet-shaped opening, and the included angle thereof at position C is 35°-45°.

[0031] In this embodiment, the central guide tube 6 is in an inverted cone shape with an angle of 2° at B, and the expansion port 7 is a trumpet shape with an angle of 40° at C, so that the stirred and stable crystallized particles are more uniform, thereby not only stabilizing the subsequent centrifugal operation, but also increasing the yield of the finished product due to the uniform crystallization.

[0032] Furthermore, an exhaust port 10 and a cleaning port 11 are provided on the outer wall of the upper head 4 , a phosphoric acid inlet pipe 12 is provided on the outer wall of the first cylinder 2 , and a stirring motor connecting flange 13 is provided at the bottom end of the lower head 5 .

[0033] In this embodiment, the tail gas port 10 is used to discharge the tail gas generated by crystallization, the cleaning port 11 is used to clean the tank body 1, the phosphoric acid inlet pipe 12 is used to feed phosphoric acid into the tank body 1, and the stirring motor connecting flange 13 is used to connect the stirring motor (not shown in the figure). The stirring motor cooperates with the stirring blades (not shown in the figure) in the tank body 1 to stir the raw materials in the tank body 1 to achieve the purpose of crystallization.

[0034] The utility model discloses a continuous crystallizer for industrial-grade monoammonium phosphate. The utility model has an inverted conical central guide tube and a trumpet-shaped expansion port added at the bottom, which can make the stirring stable crystal particles more uniform, thereby stabilizing the subsequent centrifugal operation and improving the yield of the finished product due to the uniform crystallization. The end of the mother liquor inlet pipe is close to the center part of the bottom end of the expansion port, so that the new material entering the crystallizer can be quickly mixed, so as to achieve rapid crystallization and stable crystal form, thereby realizing stable and uniform crystal particles.

[0035] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A continuous crystallizer for industrial-grade monoammonium phosphate, comprising a tank body (1), characterized in that: The tank body (1) comprises a first cylinder (2) and a second cylinder (3), wherein the first cylinder (2) is arranged at the top end of the second cylinder (3), and its bottom end extends to the bottom end inside the second cylinder (3), an upper head (4) is provided at the top end of the first cylinder (2), and a lower head (5) is provided at the bottom end of the second cylinder (3), a central guide tube (6) is provided at the center of the bottom inside the first cylinder (2), the bottom end of the central guide tube (6) extends into the lower head (5), and an expansion port (7) is provided at the bottom end of the lower head (5), and a mother liquor inlet pipe (8) and a slurry outlet pipe (9) are provided at the bottom of the lower head (5).

2. The continuous crystallizer for industrial-grade monoammonium phosphate according to claim 1, characterized in that: The mother liquid inlet pipe (8) extends obliquely upward into the lower head (5) to a position close to the bottom of the expansion opening (7).

3. The continuous crystallizer for industrial-grade monoammonium phosphate according to claim 1, characterized in that: An inner tube (14) parallel to the inner wall of the lower head (5) is provided inside the lower head (5), one end of the inner tube (14) is connected to the slurry outlet pipe (9), and the other end extends to the bottom end inside the lower head (5).

4. The continuous crystallizer for industrial-grade monoammonium phosphate according to claim 1, characterized in that: The side wall of the lower head (5) and the bottom wall of the second cylinder (3) form an angle A, and the angle A is 45°-55°.

5. The continuous crystallizer for industrial-grade monoammonium phosphate according to claim 1, characterized in that: The central guide tube (6) is in an inverted cone shape, and the angle at position B is 1.5°-2.5°.

6. The continuous crystallizer for industrial-grade monoammonium phosphate according to claim 1, characterized in that: The expansion opening (7) is a trumpet-shaped opening, and the included angle at position C is 35°-45°.

7. The continuous crystallizer for industrial-grade monoammonium phosphate according to claim 1, characterized in that: The outer wall of the upper head (4) is provided with an exhaust port (10) and a cleaning port (11), the outer wall of the first cylinder (2) is provided with a phosphoric acid inlet pipe (12), and the bottom end of the lower head (5) is provided with a stirring motor connecting flange (13).

Images