Hydrocyclone for crystalline ammonium dihydrogen phosphate slurry

Abstract

The application discloses a hydrocyclone device for crystalline ammonium dihydrogen phosphate slurry, which comprises a hydrocyclone, a centrifuge, a mother liquor tank, an ammonium dihydrogen phosphate slurry bin and a pressurized feeding pump; a feeding inlet of the hydrocyclone is in pipeline communication with a discharging outlet of the ammonium dihydrogen phosphate slurry bin, and a pressurized feeding pump is arranged on the pipeline in communication; a slurry discharging outlet of the hydrocyclone is in pipeline communication with the centrifuge; an overflow outlet of the hydrocyclone is in pipeline communication with the mother liquor tank; and a centrifugal mother liquor discharging outlet of the centrifuge is in pipeline communication with the mother liquor tank. The device utilizes the centrifugal force field of the hydrocyclone and cooperates with lateral tangential feeding to strengthen the centrifugal force field, realizes effective solid-liquid separation of ammonium dihydrogen phosphate crystalline materials, and realizes continuous and complete solid-liquid separation with the centrifugal force being 500 times higher than gravity, with the underflow directly entering the centrifuge and the overflow clear liquid entering the mother liquor tank.

Description

Technical Field

[0001] This application relates to the field of ammonium dihydrogen phosphate production technology, and in particular to a hydrocyclone separation device for crystalline ammonium dihydrogen phosphate slurry. Background Technology

[0002] In current ammonium dihydrogen phosphate crystallization production, a natural sedimentation process is used to thicken the crystal slurry. After entering the thickener, the slurry relies on gravity sedimentation for separation. The bottom material is separated by a centrifuge, and the upper clear liquid overflows to the mother liquor tank at a high level. The ammonium dihydrogen phosphate crystal slurry requiring thickening has the following characteristics:

[0003] (1) Complex particle characteristics: a. Wide particle size distribution: The slurry contains particles of various sizes, from fine to coarse. b. Complex settling behavior: Fine particles settle slowly and are easily affected by fluid disturbances, and may remain suspended for a long time or form a "fine mud layer"; coarse particles settle quickly and easily form a dense layer at the bottom. This difference leads to an unclear settling interface. c. Large differences in compressibility: The sedimentation layer formed by coarse particles has good compressibility (low porosity and high underflow concentration); the sedimentation layer formed by fine particles has poor compressibility (high porosity, loose structure, low underflow concentration and easy to disturb).

[0004] (2) Significant fluctuations in physical properties (density, viscosity): a. Density is strongly correlated with solids content: Slurry density directly depends on solids content, and fluctuations in solids content cause changes in the overall density of the slurry. b. Large viscosity variations: When the solids content is high, the slurry viscosity increases significantly (especially when the fine particle content is high, the impact is greater), resulting in poorer fluidity and increased settling resistance; when the solids content is low, the viscosity is low, and settling is relatively easy. c. Potential thixotropy: Slurries with high solids content and many fine particles may exhibit thixotropy (high viscosity when stationary, and decreased viscosity after being subjected to shear force), affecting the raking effect and underflow discharge;

[0005] (3) Unstable dynamic behavior (sedimentation and compression). Variable settling rate: Settling rate is affected by both solids content and particle size distribution. Settling is extremely slow when solids content is high (especially with many fine particles); settling is faster when solids content is low (especially with many coarse particles). Fluctuations in particle size distribution also directly affect the settling rate. Susceptible solid-liquid equilibrium: Fluctuations in particle size distribution and solids content make it very difficult to establish a stable solid-liquid equilibrium (clear stratification, constant underflow concentration) within the thickener. Small fluctuations in the upstream process can be amplified in the operation of the thickener.

[0006] (4) Narrow and sensitive operating window: a. Highly sensitive to feed conditions: Instability of upstream crystallization or concentration processes (leading to fluctuations in particle size and solids content) will directly and significantly affect the performance of the thickener (settling rate, underflow concentration, overflow clarity). b. Difficult to control: Frequent adjustments to operating parameters (such as rake speed and underflow discharge rate) are required to adapt to fluctuations in feed conditions. Fixed operating parameters often fail to achieve stable separation results. c. Unstable separation efficiency (time): The residence time (separation time) required to reach the target underflow concentration or clear liquid layer varies, making it difficult to predict and control accurately. Sometimes it is necessary to extend the residence time (sacrificing throughput), and sometimes the underflow may become too concentrated or even clogged due to excessively rapid settling. d. Risks of overflow turbidity and underflow blockage coexist: Overflow turbidity: When the solids content is too low or there are too many fine particles, the settling interface is unclear or the fine particles cannot settle effectively, resulting in turbid overflow. Underflow blockage: Excessive solids content (especially when there are many coarse particles and the rake / discharge is not smooth) or excessive compression may cause difficulties in the underflow pipeline or pumping, or even excessive rake torque.

[0007] In summary, the core characteristics of the slurry in an ammonium dihydrogen phosphate thickener are: High heterogeneity: the wide particle size distribution and large fluctuations in solids content are the fundamental reasons. Strong dynamism: settling, compression behavior, and physical properties fluctuate drastically with feed conditions. Operational sensitivity: extremely sensitive to upstream fluctuations, requiring dynamic adjustment of operating parameters. Instability in separation performance: separation efficiency (settling velocity, degree of compression, required time, overflow / underflow mass) is difficult to maintain stably.

[0008] For ammonium dihydrogen phosphate slurry with the above characteristics, during the thickening process, once the ammonium dihydrogen phosphate slurry from the crystallizer discharge pump meets the requirements (when the solid content of the ammonium dihydrogen phosphate slurry is 25-40%), it is collected into the thickener. At the same time, the agitator is turned on, and the centrifuge is started according to the centrifuge operating procedures to discharge the slurry into the centrifuge for solid-liquid separation. When the solid content of the slurry discharged from the thickener is low, the opening of the discharge valve is reduced, the discharge rate is reduced, and the overflow rate of the clear liquid is increased. When draining the clear liquid, the operator needs to continuously observe the solid content of the slurry in the thickener. If the solid content is greater than 40%, the opening of the discharge valve is increased, and the discharge rate is increased.

[0009] The centrifugal separation section includes a thickener, centrifuges, and a mother liquor recovery pipeline assembly. The thickener's main function is to separate the solid and liquid components of the ammonium dihydrogen phosphate slurry after the crystallizer. The vacuum crystallizer and thickener are connected via pipelines, with a crystallization discharge pump installed on the connecting pipelines to collect the qualified slurry to the thickener. Under the action of the agitator, the lower material enters the centrifuges for centrifugal separation through pipelines. The upper clear liquid overflows at a high level and is then transported to the centrifugal mother liquor tank through pipelines. The discharge pipe at the bottom of the thickener needs to be periodically steam-purged to ensure the pipeline remains unblocked.

[0010] The existing thickening process has the following problems:

[0011] (1) High dependence on manual labor: The determination of whether the thickening operation has been completed depends entirely on the operator, which makes it impossible to unify the degree of thickening of each batch of products;

[0012] (2) The existing production equipment has a high failure rate. Due to the high viscosity of the slurry discharged from the bottom of the thickener, the pipeline is prone to frequent blockage during production. Steam purging is necessary to ensure the pipeline is unobstructed. Frequent blockage of the pipeline will lead to damage to the thickener and centrifuge. The existing thickener structure is similar to a settling tank, with simultaneous inflow and outflow. There is no insulation structure. The clear liquid overflows from the top, and the slurry with high solid content is transported into the centrifuge from the bottom of the tank. When the solid content of the slurry entering the thickener is greater than 40%, if the operator fails to increase the opening of the thickener discharge valve in time, the solid content of the material in the thickener will become higher and higher, eventually causing the agitator in the thickener to be damaged due to excessive resistance. In addition, when the solid content of the slurry in the thickener is too high, the slurry will also flow out from the overflow pipe along with the clear liquid. The overflowed solution will quickly crystallize in the pipeline, causing the overflow pipe to be blocked.

[0013] (3) Process interlocking issues: Incomplete material settling leads to excessively high moisture content in the bottom material entering the centrifuge, causing the centrifuge to "run thin" and the drying system to be easily blocked, resulting in excessive moisture content in the product. In the existing production system, when the solid content of the thickener is less than 25%, and the opening of the thickener's discharge valve is not reduced in time, the discharge volume is not reduced in time, and the overflow of the clear liquid is increased, the centrifuge will not be able to separate solid and liquid completely. The moisture content of the material entering the drying fluidized bed will be greater than 5%, causing the drying fluidized bed to clump and become blocked, requiring shutdown for cleaning, which will prevent continuous production.

[0014] (4) Inefficient: The solid-liquid separation of the material after processing by the existing equipment is incomplete, which will cause the above defects 1) to 3) to occur frequently, resulting in poor operation of the equipment; at the same time, the centrifuge runs out of liquid and the drying fluidized bed is blocked, which will cause products with excessive moisture to enter the product warehouse. If not detected in time, it will cause product quality problems.

[0015] Therefore, there is an urgent need to develop efficient and automated solid-liquid separation devices to solve the clogging problem and achieve intelligent production.

[0016] The information disclosed in the background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art. Utility Model Content

[0017] This application addresses the aforementioned technical problem by providing a hydrocyclone separation device for crystalline ammonium dihydrogen phosphate slurry. This device can achieve effective solid-liquid separation of ammonium dihydrogen phosphate slurry before centrifugation, avoiding excessive moisture content in the material after centrifugation that could cause blockage of the drying fluidized bed.

[0018] This application provides a hydrocyclone separation device for crystalline ammonium dihydrogen phosphate slurry, comprising: a hydrocyclone separator, a centrifuge, a mother liquor tank, an ammonium dihydrogen phosphate slurry bin, and a pressurized feed pump;

[0019] The feed inlet of the hydrocyclone separator is connected to the discharge outlet of the ammonium dihydrogen phosphate slurry silo via a pipeline, and a pressurized feed pump is installed on the connected pipeline.

[0020] The slurry outlet of the hydrocyclone is connected to the centrifuge pipeline; the overflow outlet of the hydrocyclone is connected to the mother liquor tank pipeline.

[0021] The centrifuge's mother liquor outlet is connected to the mother liquor tank pipeline.

[0022] Preferably, the hydrocyclone separator includes: a side-inlet, a cyclone cylinder, and a conical bottom cylinder; the side-inlet is located on the top side wall of the cyclone cylinder; the conical bottom cylinder is connected to the bottom of the cyclone cylinder.

[0023] Preferably, the hydrocyclone separator includes: an overflow valve and an inner cyclone chamber; the top of the inner cyclone chamber extends beyond the top surface of the cyclone cylinder; the top surface of the inner cyclone chamber is connected to the mother liquor tank pipeline, and an overflow valve is installed on the connected pipeline.

[0024] Preferably, the bottom of the conical bottom cylinder is a conical bottom with a taper of 20°.

[0025] Preferably, the bottom of the conical bottom cylinder is connected to the centrifuge via a discharge pipe; the discharge pipe is made of 304 stainless steel and is vertically connected to the bottom of the conical bottom cylinder and the centrifuge without modification.

[0026] Preferably, the feed path of the slanted feed inlet is tangent to the circular cross-section of the cyclone separator.

[0027] Preferably, it includes: a mother liquor buffer tank; the inlet of the mother liquor buffer tank is connected to the outlet of the centrifuge; the outlet of the mother liquor buffer tank is connected to the centrifugal mother liquor inlet of the mother liquor tank.

[0028] Preferably, the inner swirling chamber is connected to the clear liquid inlet of the hydrocyclone separator in the mother liquor tank.

[0029] Preferably, the mother liquor tank includes: a tank body, a stirring assembly, a hydrocyclone clear liquid inlet, and a centrifugal mother liquor inlet; the stirring assembly, the hydrocyclone clear liquid inlet, and the centrifugal mother liquor inlet are spaced apart on the top surface of the tank body.

[0030] The beneficial effects that this application can produce include:

[0031] 1) The hydrocyclone separator for crystalline ammonium dihydrogen phosphate slurry provided in this application utilizes the centrifugal force field of the hydrocyclone separator, combined with lateral tangential feeding, to enhance the centrifugal force field and achieve effective solid-liquid separation of ammonium dihydrogen phosphate crystalline material. A high-speed vortex is formed in the conical container (20° taper) of the hydrocyclone separator, where the centrifugal force is more than 500 times higher than gravity, causing larger crystal particles to be thrown towards the container wall, forming a bottom flow (high-concentration slurry), while the lighter phase component (clear liquid) gathers towards the center, forming an inner vortex that is discharged from the top overflow port; thus achieving continuous and thorough solid-liquid separation, with the bottom flow directly entering the centrifuge and the overflow clear liquid entering the mother liquor tank.

[0032] 2) The hydrocyclone separation device for crystalline ammonium dihydrogen phosphate slurry provided in this application can achieve a basically consistent separation effect for each batch of materials, is not affected by the operator's experience, avoids damage to centrifuges and thickeners, reduces the water content of materials entering the centrifuge, effectively controls the water content of the product, ensures thorough solid-liquid separation, and achieves continuous operation.

[0033] 3) The hydrocyclone separation device for crystalline ammonium dihydrogen phosphate slurry provided in this application does not require a thickener or steam purging, effectively reducing energy consumption by 30% and maintenance costs by 50%. It is applicable to the production of crystalline ammonium dihydrogen phosphate, avoids crystal blockage of pipelines, and extends equipment life. Attached Figure Description

[0034] Figure 1 A schematic diagram of the production apparatus provided in at least one embodiment of this application;

[0035] Figure 2 for Figure 1 AA sectional view;

[0036] Legend:

[0037] Ammonium dihydrogen phosphate slurry 1, pressurized feed pump 13, slurry feed valve 11, overflow valve 12, side-inlet 212, inner vortex chamber 21, vortex cylinder 2, conical bottom cylinder 213, centrifugal feed valve 224, centrifuge 3, mother liquor buffer tank 31, dry material outlet 311, mother liquor tank 32, stirring assembly 323, clear liquid inlet of vortex separator 322, centrifugal mother liquor inlet 321. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0039] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0040] Technical means not detailed in this application and not used to solve the technical problems of this application are all set according to common general knowledge in the field, and multiple common general knowledge setting methods can be implemented.

[0041] See Figures 1-2 The hydrocyclone separator for crystalline ammonium dihydrogen phosphate slurry provided in this application includes: an ammonium dihydrogen phosphate slurry silo 1, a pressurized feed pump 13, a slurry feed valve 11, an overflow valve 12, a side-inlet feed port 212, an inner cyclone chamber 21, a cyclone cylinder 2, a conical bottom cylinder 213, a centrifugal feed valve 224, a centrifuge 3, a mother liquor buffer tank 31, a dry material outlet 311, a mother liquor tank 32, a stirring assembly 323, a hydrocyclone separator clear liquid inlet 322, and a centrifugal mother liquor inlet 321;

[0042] The ammonium dihydrogen phosphate slurry silo 1 contains ammonium dihydrogen phosphate crystal slurry with a solid content of 25-40% for subsequent separation and centrifugation operations. The outlet of the ammonium dihydrogen phosphate slurry silo 1 is connected to the inclined feed inlet 212 of the hydrocyclone separator via a pipeline. A pressurized feed pump 13 and a slurry feed valve 11 are installed on the connected pipeline, allowing operators to adjust the flow rate of the material entering the hydrocyclone separator as needed to ensure the hydrocyclone solid-liquid separation effect. After being pressurized by the pressurized feed pump 13, the crystal slurry enters the hydrocyclone separator at a pressure of 5-8 bar. The centrifugal force of the hydrocyclone separator achieves efficient separation; the centrifugal force is more than 500 times higher than gravity (thickening agent), causing larger crystal particles in the slurry to be thrown towards the separator wall, forming an underflow (high-concentration slurry). The lighter phase component (clare liquid) gathers towards the center, forming an inner vortex, which is discharged from the overflow port at the top of the inner vortex chamber 21, achieving continuous and thorough solid-liquid separation. A conical bottom cylinder 213 is installed at the bottom of the hydrocyclone 2. With a higher solid content, after the material flows out from the bottom of the 20° cone bottom cylinder 213, it directly enters the centrifuge 3 through a connecting pipe for solid-liquid separation. Using this device, hydrocyclone separation replaces natural sedimentation: solving blockages and manual dependence, achieving continuous automated operation. The thickening agent and steam purging process are eliminated, reducing energy consumption by 30% and maintenance costs by 50%.

[0043] The hydrocyclone used in this application is a hydrocyclone, which uses the principle of centrifugal sedimentation to separate particulate matter in a mixture. However, this device is mainly used to separate solid impurities in water, and it has not been found to be used to separate ammonium dihydrogen phosphate slurry with a relatively high viscosity than water.

[0044] In one specific embodiment, the hydrocyclone separator includes: an inner swirling chamber 21, a swirling cylinder 2, and a conical bottom cylinder 213. The swirling cylinder 2 is cylindrical, with a side-sloping feed inlet 212 on its top sidewall. The slurry is fed through the side-sloping feed inlet 212, allowing the slurry to be fed tangentially to the cross-section of the swirling cylinder 2, further increasing the centrifugal force within the swirling cylinder 2 and achieving better solid-liquid separation in the slurry. A conical bottom cylinder 213 is located at the bottom of the swirling cylinder 2. This structure enhances the centrifugal force field, increasing the separation efficiency by more than 40% (compared to sedimentation processes). The function of the conical bottom cylinder 213 is to accelerate the rotation speed of the fluid, thereby improving the separation efficiency. Heavier phases (such as liquids containing more solid particles or heavier liquids) are discharged from the bottom of the conical bottom cylinder 213. The working principle of the hydrocyclone separator: When the mixture flows into the hydrocyclone separator, the inlet design causes the fluid to begin high-speed rotation. Due to centrifugal force, heavier particles are thrown outwards and move downwards along the conical section, eventually exiting through the underflow outlet. Lighter particles, on the other hand, concentrate in the central region and move towards the overflow outlet with the rising airflow.

[0045] An inner swirling cavity 21 is provided in the top center area of ​​the swirling cylinder 2. The inner swirling cavity 21 is a cylindrical structure. The top of the inner swirling cavity 21 extends out of the top surface of the swirling cylinder 2, thereby realizing the overflow of the clear liquid from the top surface of the inner swirling cavity 21.

[0046] In one specific embodiment, the top of the inner swirling cavity 21 is connected to the mother liquor tank 32 via a pipeline, specifically to the clear liquid inlet 322 of the swirling separator at the top of the mother liquor tank 32.

[0047] In one specific embodiment, the pipeline connecting the inner vortex chamber 21 and the mother liquor tank 32 is made of 304 stainless steel, and the connecting pipeline is vertically connected. This reduces the risk of material clogging the pipeline, ensures the smooth operation of continuous production, and guarantees unobstructed pipeline flow even without the steam purging equipment.

[0048] In one specific embodiment, the cyclone tube 2 is a cylindrical structure, serving as the main part of the hydrocyclone separator. The crystal slurry can generate rotational motion inside it, thereby achieving solid-liquid separation.

[0049] In one specific embodiment, a centrifugal feed valve 224 is installed on the pipeline connecting the hydrocyclone separator and the centrifuge 3. The centrifugal feed valve 224 can control the concentration of the discharged slurry according to the processing needs of the centrifuge 3, so as to avoid the problem of "thinning" caused by excessive water content of the slurry entering the centrifuge 3.

[0050] In one specific embodiment, it includes: an overflow valve 12; the overflow valve 12 is disposed on the pipeline connecting the inner swirling chamber 21 and the mother liquor tank 32, in order to control the discharge.

[0051] In one specific embodiment, it includes: a mother liquor buffer tank 31; the inlet of the mother liquor buffer tank 31 is connected to the outlet of the centrifuge 3 to buffer the centrifuged mother liquor, and the outlet of the mother liquor buffer tank 31 is connected to the centrifuged mother liquor inlet 321 of the mother liquor tank 32 to achieve normal discharge of the centrifuged mother liquor.

[0052] In one specific embodiment, the mother liquor tank 32 includes: a stirring assembly 323 and a tank body; the stirring assembly 323 is disposed inside and is used to stir the centrifuged mother liquor and overflow clear liquid to prevent sedimentation.

[0053] In one specific embodiment, the clear liquid inlet 322 and the centrifugal mother liquor inlet 321 of the hydrocyclone separator are spaced apart on the top surface of the tank.

[0054] In one specific embodiment, the dry material outlet 311 of the centrifuge 3 discharges dry material, which enters the drying fluidized bed for further drying.

[0055] Technical effect comparison:

[0056] The device is already operating normally at the Sanhuan Phosphate Plant. Performance comparisons during operation are shown in the table below:

[0057] surface

[0058]

[0059] As can be seen from the table above, the device provided in this application can achieve effective solid-liquid separation of ammonium dihydrogen phosphate slurry, save energy, achieve good separation effect, ensure the normal operation of continuous production, and avoid pipeline blockage problems.

[0060] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A hydrocyclone separation device for crystalline ammonium dihydrogen phosphate slurry, characterized in that, include: Hydrocyclone separator, centrifuge (3), mother liquor tank (32), ammonium dihydrogen phosphate slurry silo (1), pressurized feed pump (13); The feed inlet of the hydrocyclone separator is connected to the discharge outlet of the ammonium dihydrogen phosphate slurry silo (1), and a pressurized feed pump (13) is installed on the connected pipeline. The slurry outlet of the hydrocyclone is connected to the centrifuge (3) pipeline; the overflow outlet of the hydrocyclone is connected to the mother liquor tank (32) pipeline; The centrifuge (3) mother liquor outlet is connected to the mother liquor tank (32) pipeline.

2. The hydrocyclone separation device for crystalline ammonium dihydrogen phosphate slurry according to claim 1, characterized in that, The hydrocyclone separator includes: a side-inlet (212), a cyclone cylinder (2), and a cone bottom cylinder (213); the side-inlet (212) is located on the top side wall of the cyclone cylinder (2); the cone bottom cylinder (213) is connected to the bottom of the cyclone cylinder (2).

3. The hydrocyclone separation device for crystalline ammonium dihydrogen phosphate slurry according to claim 2, characterized in that, The hydrocyclone separator includes: an overflow valve (12) and an inner cyclone chamber (21); the top of the inner cyclone chamber (21) extends out of the top surface of the cyclone cylinder (2); the top surface of the inner cyclone chamber (21) is connected to the mother liquor tank (32) via a pipeline, and an overflow valve (12) is installed on the connected pipeline.

4. The hydrocyclone separation device for crystalline ammonium dihydrogen phosphate slurry according to claim 2, characterized in that, The bottom of the cone-bottomed tube (213) is a cone bottom with a taper of 20°.

5. The hydrocyclone separation device for crystalline ammonium dihydrogen phosphate slurry according to claim 2, characterized in that, The bottom of the cone bottom cylinder (213) is connected to the centrifuge (3) through a discharge pipe; the discharge pipe is made of stainless steel 304 and is vertically connected to the bottom of the cone bottom cylinder (213) and the centrifuge (3).

6. The hydrocyclone separation apparatus for crystalline ammonium dihydrogen phosphate slurry according to claim 2, characterized in that, The feed path of the lateral feed inlet (212) is set to be tangent to the circular cross-section of the cyclone tube (2).

7. The hydrocyclone separation apparatus for crystalline ammonium dihydrogen phosphate slurry according to claim 1, characterized in that, include: Mother liquor buffer tank (31); the inlet of the mother liquor buffer tank (31) is connected to the outlet of the centrifuge (3); the outlet of the mother liquor buffer tank (31) is connected to the centrifugal mother liquor inlet (321) of the mother liquor tank (32).

8. The hydrocyclone separation device for crystalline ammonium dihydrogen phosphate slurry according to claim 3, characterized in that, The inner swirling chamber (21) is connected to the clear liquid inlet (322) of the swirling separator of the mother liquid tank (32).

9. The hydrocyclone separation apparatus for crystalline ammonium dihydrogen phosphate slurry according to claim 7 or 8, characterized in that, The mother liquor tank (32) includes: a tank body, a stirring assembly (323), a hydrocyclone clear liquid inlet (322), and a centrifugal mother liquor inlet (321); the stirring assembly (323), the hydrocyclone clear liquid inlet (322), and the centrifugal mother liquor inlet (321) are spaced apart on the top surface of the tank body.

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