Phosphoric acid raw material mixing device

Abstract

The utility model discloses a phosphoric acid raw material mixing device, and belongs to the field of phosphoric acid production and processing.The mixing device comprises a mixing tank and a stirring assembly arranged in the mixing tank; the stirring assembly comprises a main stirring shaft and auxiliary stirring shafts arranged around the main stirring shaft, one end of the main stirring shaft is fixedly connected with the output end of a main motor arranged at the top of the mixing tank, main stirring blades are fixedly arranged on the main stirring shaft, and one end of each auxiliary stirring shaft is fixedly connected with the output end of an auxiliary motor fixedly arranged at the top of the mixing tank; auxiliary stirring blades are fixedly arranged on the auxiliary stirring shaft; a spiral guide plate is fixedly arranged on the inner wall of the mixing tank. Through the cooperation of the main stirring shaft and the auxiliary stirring shaft and the matching of the main stirring blades and the auxiliary stirring blades with different shapes and sizes, a multi-direction and multi-range composite flow field can be formed in the mixing tank, the local vortex limitation of single-shaft stirring is effectively broken, the mixing dead angles in the areas such as the edge and the bottom of the tank body are eliminated, and the raw materials are mixed more uniformly.

Description

Technical Field

[0001] This application relates to the field of phosphoric acid production and processing technology, specifically a phosphoric acid raw material mixing device. Background Technology

[0002] In the production of phosphoric acid, multiple raw materials such as phosphate rock powder, sulfuric acid, and water need to be mixed in precise proportions to prepare reaction materials that meet the requirements of the extraction process. The density differences, particle characteristics, and exothermic properties of the raw materials require the stirring mechanism to have efficient shear dispersion capabilities and a three-dimensional flow field mixing effect.

[0003] Traditional mixing mechanisms generally adopt a design with a single mixing shaft and mixing blades. After the mixing shaft is driven by a top motor, the material only rotates around the mixing shaft in a circumferential motion, forming a "cylindrical vortex zone" centered on the shaft, which makes it difficult to form all-round, multi-angle material convection and mixing.

[0004] Therefore, this application provides a phosphoric acid feedstock mixing device to solve the above-mentioned problems. Utility Model Content

[0005] This application provides a phosphate feedstock mixing device, which aims to solve the problems mentioned in the background art, such as poor mixing uniformity of existing stirring mechanisms, difficulty in achieving all-round and multi-angle convection mixing of materials, and large deviations in product composition.

[0006] To achieve the above objectives, this application provides the following technical solution: a phosphoric acid raw material mixing device, including a mixing tank and a stirring assembly disposed inside the mixing tank for stirring and mixing the phosphoric acid raw material, wherein the top of the mixing tank is provided with a feed inlet and the bottom of the mixing tank is provided with a discharge outlet;

[0007] The mixing assembly includes a main mixing shaft and a secondary mixing shaft arranged around the main mixing shaft. One end of the main mixing shaft is fixedly connected to the output end of a main motor located at the top of the mixing tank. Main mixing blades are fixedly mounted on the main mixing shaft. One end of the secondary mixing shaft is fixedly connected to the output end of a secondary motor fixedly located at the top of the mixing tank. Secondary mixing blades are fixedly mounted on the secondary mixing shaft. A spiral guide plate is fixedly mounted on the inner wall of the mixing tank, extending from the top to the bottom of the mixing tank. The main motor drives the main mixing shaft and main mixing blades to rotate at high speed, causing the material to flow in the main body according to the blade type. The secondary motor drives the secondary mixing shaft and secondary mixing blades to rotate synchronously or asynchronously, using the differentiated design of the blades to supplement local shearing, guiding, or anti-sticking functions. After the main and secondary flow fields are superimposed, the material, guided by centrifugal force, thrust, and the spiral guide plate, forms a three-dimensional mixing motion of "large-scale tumbling of the main shaft + local refinement of the secondary shaft", ensuring full contact of each component.

[0008] Preferably, to achieve mixing in different directions and ranges, the main stirring blades and the auxiliary stirring blades have different shapes and sizes.

[0009] Preferably, both the main motor and the auxiliary motor are speed-regulating motors. The use of speed-regulating motors for both the main and auxiliary motors allows for independent adjustment of the main and auxiliary shaft speeds based on changes in the viscosity, particle characteristics, and process stage of the phosphate raw material. This enables the stirring mechanism to adapt to different operating conditions, avoiding insufficient mixing or energy waste caused by a single speed, and improving the equipment's versatility and process flexibility.

[0010] Preferably, to improve mixing efficiency, three auxiliary stirring shafts are provided, arranged equidistantly in a ring around the main stirring shaft. The three auxiliary stirring shafts, equidistantly distributed in a ring around the main stirring shaft, cover the entire cross-section of the mixing tank, forming a symmetrical and balanced mixing load. Combined with different types of auxiliary stirring blades (such as paddle, anchor, and ribbon types), multiple sets of shear flows and circulating flows can be generated in the material. Compared to single / dual auxiliary shaft designs, this further improves mixing efficiency, especially for high-viscosity or particulate materials, effectively reducing stratification and increasing the material exchange rate between the tank edge and the central area.

[0011] Preferably, to reduce the number of auxiliary motors used: an internal gear ring is rotatably embedded on the side of the top of the mixing tank, and gears meshing with the internal gear ring are fixedly fitted on the top of each of the three auxiliary stirring shafts. By setting an internal gear ring on the top of the mixing tank and installing gears meshing with the internal gear ring on the top of the three auxiliary stirring shafts, a single auxiliary motor can drive the three auxiliary shafts to rotate synchronously. Compared with the independent auxiliary motor drive scheme, this reduces two motors and their associated control modules, lowers equipment costs, avoids the complexity of multi-motor synchronous control, and improves the stability and reliability of mechanical transmission.

[0012] Preferably, to facilitate the protection of the internal gear ring and gear, a protective shell is provided on the outside of the internal gear ring and the gear, which is fixedly connected to the mixing tank. The protective shell completely encloses the internal gear ring and gear, forming a closed transmission cavity, which can effectively isolate phosphate raw material dust, moisture and external debris, prevent wear, jamming or corrosion of the gear meshing surface caused by contamination, extend the service life of the transmission mechanism, and reduce the frequency of equipment maintenance.

[0013] Preferably, to facilitate control of the feeding rate of different raw materials: multiple feeding ports are provided, arranged in a ring on the mixing tank. A feeding pipe is fixedly installed inside each feeding port, and a flow meter is installed on the feeding pipe. A solenoid valve is installed on the feeding pipe between the feeding port and the flow meter. By providing multiple feeding ports and feeding pipes with solenoid valves and flow meters, the feeding amount and feeding rate of different raw materials can be precisely controlled, facilitating the adjustment of the raw material ratio.

[0014] Preferably, for convenient control of the discharge port: a discharge pipe is fixedly installed inside the discharge port, and a discharge valve is fixedly installed on the discharge pipe. The discharge port is located at the bottom of the mixing tank, and together with the discharge pipe and discharge valve (such as a ball valve or butterfly valve), the mixing discharge speed and flow rate can be precisely controlled. The sealing performance of the discharge valve ensures that there is no leakage in the tank during the mixing process, and at the same time supports quick opening / closing, meeting the "mix and discharge immediately" requirement in continuous production.

[0015] This application utilizes the coordinated operation of the main and auxiliary stirring shafts, along with main and auxiliary stirring blades of different shapes and sizes, to create a multi-directional and multi-range composite flow field within the mixing tank. This effectively breaks the local vortex limitations of single-shaft stirring, eliminates mixing dead zones in areas such as the tank edges and bottom, and enables all-round and multi-angle stirring, resulting in more uniform mixing of raw materials.

[0016] This application presents three auxiliary stirring shafts that are equidistantly distributed in a ring around the main stirring shaft, covering the entire cross-section of the mixing tank and forming a symmetrical and balanced stirring load. Combined with different types of auxiliary stirring blades, multiple sets of shear flows and circulating flows can be generated in the material. Compared to single / dual auxiliary shaft designs, this further improves mixing efficiency, especially for high-viscosity or particulate materials, effectively reducing stratification and increasing the material exchange rate between the tank's edge and central areas.

[0017] This application, by setting multiple feed ports and a feed pipe equipped with solenoid valves and flow meters, can accurately control the feed amount and feed speed of different raw materials, and facilitate the adjustment of the raw material ratio. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a phosphoric acid feedstock mixing device;

[0019] Figure 2 This is a schematic diagram of the internal structure of the mixing tank.

[0020] In the picture:

[0021] 1. Mixing tank; 11. Inlet; 111. Inlet pipe; 1111. Flow meter; 1112. Solenoid valve; 12. Outlet; 121. Outlet pipe; 1211. Outlet valve; 2. Mixing assembly; 21. Main mixing shaft; 211. Main motor; 212. Main mixing blades; 22. Auxiliary mixing shaft; 221. Auxiliary motor; 222. Auxiliary mixing blades; 223. Internal gear ring; 224. Gear; 225. Protective shell; 3. Spiral guide plate. Detailed Implementation

[0022] 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 a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0023] Example 1

[0024] This embodiment provides a phosphoric acid feedstock mixing device, such as... Figure 1-2 As shown, the mixing device includes a mixing tank 1 and a stirring assembly 2 disposed inside the mixing tank 1 for mixing the phosphate raw material. The top of the mixing tank 1 is provided with a feed inlet 11 and the bottom of the mixing tank 1 is provided with a discharge outlet 12.

[0025] The mixing assembly 2 includes a main mixing shaft 21 and a secondary mixing shaft 22 disposed around the main mixing shaft 21. One end of the main mixing shaft 21 is fixedly connected to the output end of the main motor 211 disposed at the top of the mixing tank 1. A main mixing blade 212 is fixedly disposed on the main mixing shaft 21. One end of the secondary mixing shaft 22 is fixedly connected to the output end of the secondary motor 221 fixedly disposed at the top of the mixing tank 1. A secondary mixing blade 222 is fixedly disposed on the secondary mixing shaft 22. A spiral guide plate 3 is fixedly disposed on the inner wall of the mixing tank 1, and the spiral guide plate 3 extends from the top to the bottom of the mixing tank 1. Through the coordinated operation of the main stirring shaft 21 and the auxiliary stirring shaft 22, and with main stirring blades 212 (such as turbines) and auxiliary stirring blades 222 (such as sawtooth blades) of different shapes and sizes, a multi-directional and multi-range composite flow field (radial, axial, and circumferential) can be formed within the mixing tank 1. This effectively breaks the local vortex limitations of single-shaft stirring, eliminates mixing dead zones in areas such as the tank edges and bottom, and enables all-round and multi-angle stirring, resulting in more uniform mixing of raw materials. The main motor 211 drives the main stirring shaft 21 and the main stirring blades 212 to rotate at high speed, guiding the material to make the main flow according to the blade type. The auxiliary motor 221 drives the auxiliary stirring shaft 22 and the auxiliary stirring blades 222 to rotate synchronously or asynchronously, using the differentiated design of the blades to supplement local shearing, guiding, or anti-sticking functions. After the main and auxiliary flow fields are superimposed, the material, guided by centrifugal force, thrust, and the spiral guide plate 3, forms a three-dimensional mixing motion of "large-scale tumbling of the main shaft + local refinement of the auxiliary shaft," ensuring full contact between the components.

[0026] To achieve mixing in different directions and ranges: the main stirring blade 212 and the auxiliary stirring blade 222 have different shapes and sizes.

[0027] Both the main motor 211 and the auxiliary motor 221 are speed-regulating motors. The speed regulation of both motors allows for independent adjustment of the main and auxiliary shaft speeds based on changes in the viscosity, particle characteristics, and process stage of the phosphate raw material. This enables the stirring mechanism to adapt to different operating conditions, avoiding insufficient mixing or energy waste caused by a single speed, and improving equipment versatility and process flexibility. The speed-regulating motors receive control signals via a frequency converter or servo system to adjust their output speed in real time. For example, when an increase in material viscosity is detected (based on feedback from a built-in torque sensor), the speed of the main motor 211 can be automatically increased to enhance shear force; when entering the unloading stage, the speed of the auxiliary motor 221 can be reduced to minimize material splashing. The independent adjustability of the main and auxiliary shaft speeds, combined with differences in blade shape, enables dynamic switching between "low-speed convection + high-speed shearing," precisely matching different mixing requirements.

[0028] To improve mixing efficiency, three auxiliary stirring shafts 22 are arranged in a ring around the main stirring shaft 21 at equal intervals. These three auxiliary stirring shafts 22, centered on the main stirring shaft 21, cover the entire cross-section of the mixing tank 1, forming a symmetrical and balanced mixing load. Combined with different types of auxiliary stirring blades 222 (such as paddle, anchor, and ribbon types), multiple shear flows and circulating flows can be generated in the material. Compared to single / dual auxiliary shaft designs, this further improves mixing efficiency, especially for high-viscosity or particulate materials, effectively reducing stratification and increasing the material exchange rate between the tank edge and the center area. When the three auxiliary stirring shafts 22 rotate synchronously or asynchronously, their blades form a uniformly distributed disturbance source in the circumferential direction. For example, when the secondary shaft blades are ribbon-type, they can push the material to move spirally upwards / downwards along the side wall of the tank, forming a coupling effect of "outer circulation + central convection" with the central flow of the main shaft blades; when the blades are sawtooth blades, the shear force generated by high-speed rotation can break up particle agglomerates. Under the combined action of the three, the material forms a multi-vortex, multi-path flow trajectory in the tank, eliminating the "strong center, weak edge" defect of single-shaft stirring.

[0029] To reduce the number of auxiliary motors 221 required, an internal gear ring 223 is rotatably embedded on the side of the top of the mixing tank 1, and gears 224 meshing with the internal gear ring 223 are fixedly fitted on the top of each of the three auxiliary stirring shafts 22. By setting the internal gear ring 223 on the top of the mixing tank 1 and installing gears 224 meshing with the internal gear ring 223 on the top of the three auxiliary stirring shafts 22, a single auxiliary motor 221 can drive the three auxiliary shafts to rotate synchronously. Compared with the independent auxiliary motor 221 drive scheme, this reduces two motors and their associated control modules, lowers equipment costs, avoids the complexity of multi-motor synchronous control, and improves the stability and reliability of mechanical transmission. The internal gear ring 223 is fixed to the top of the mixing tank 1 by bearings and can rotate around its central axis. When the auxiliary motor 221 drives one of the gears 224 to rotate, the gear 224 meshes with the internal teeth of the internal gear ring 223, driving the adjacent gears 224 to rotate synchronously, thereby achieving uniform speed and unidirectional rotation of the three auxiliary stirring shafts 22. This transmission method utilizes the high-precision characteristics of gear 224 meshing to ensure consistent countershaft speed and avoid flow field turbulence caused by speed differences.

[0030] To facilitate the protection of the internal gear ring 223 and gear 224, a protective shell 225 is fixedly connected to the mixing tank 1. The protective shell 225 completely encloses the internal gear ring 223 and gear 224, forming a closed transmission cavity. This effectively isolates phosphate raw material dust, moisture, and external debris, preventing wear, jamming, or corrosion of the gear 224 meshing surface due to contamination, extending the life of the transmission mechanism, and reducing equipment maintenance frequency. The protective shell 225 uses a sealed structure and is fixedly connected to the top of the mixing tank 1. When the gear 224 meshes and rotates with the internal gear ring 223, the protective shell 225 prevents external impurities from entering the transmission area.

[0031] To facilitate control of the discharge port 12, a discharge pipe 121 is fixedly installed inside the discharge port 12, and a discharge valve 1211 is fixedly installed on the discharge pipe 121. The discharge port 12 is located at the bottom of the mixing tank 1. Together with the discharge pipe 121 and the discharge valve 1211 (such as a ball valve or butterfly valve), the mixing discharge speed and flow rate can be precisely controlled. The sealing performance of the discharge valve 1211 ensures no leakage in the tank during mixing, while also supporting rapid opening / closing to meet the "mix and discharge immediately" requirement in continuous production. The discharge valve 1211 is controlled to open and close manually or electrically. When mixing is complete, the valve is opened, and the material is discharged from the discharge pipe 121 under gravity.

[0032] Example 2

[0033] Unlike Example 1, to facilitate control of the feeding rate of different raw materials, multiple feed inlets 11 are provided, arranged in a ring on the mixing tank 1. A feed pipe 111 is fixedly installed inside each feed inlet 11, and a flow meter 1111 is installed on the feed pipe 111. A solenoid valve 1112 is installed on the feed pipe 111 between the feed inlet 11 and the flow meter 1111. By providing multiple feed inlets 11 and feed pipes 111 with solenoid valves 1112 and flow meters 1111, the feeding amount and feeding rate of different raw materials can be precisely controlled, facilitating the adjustment of the raw material ratio. The ring arrangement of multiple feed inlets 11 allows raw materials to be injected simultaneously from different positions on the top of the tank, avoiding excessively high local concentrations caused by single-point feeding. Combined with the stirring mechanism, rapid dispersion further improves the initial mixing efficiency.

[0034] The wiring diagrams of the main motor 211 and the auxiliary motor 221 in this utility model are common knowledge in the field, and their working principles are known technologies. The appropriate model is selected according to actual use. Therefore, the control method and wiring layout of the main motor 211 and the auxiliary motor 221 will not be explained in detail.

[0035] The control method of this application is through a controller. The control circuit of the controller can be implemented by a person skilled in the art through simple programming. The power supply and grounding are also common knowledge in the art. Since this application is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail here.

[0036] It should be noted that many of the standard parts used in this application are available on the market, while non-standard parts can be specially customized. The connection method used in this application is also a very common method in the mechanical field, and will not be described in detail here.

[0037] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and concept of this application, should be included within the scope of protection of this application.

Claims

1. A phosphoric acid raw material mixing device, comprising a mixing tank (1) and a stirring assembly (2) arranged inside the mixing tank (1) for stirring and mixing the phosphoric acid raw material, a feeding port (11) is arranged at the top of the mixing tank (1), and a discharging port (12) is arranged at the bottom of the mixing tank (1); characterized in that the stirring assembly (2) comprises a main stirring shaft (21) and a secondary stirring shaft (22) arranged around the main stirring shaft (21), one end of the main stirring shaft (21) is fixedly connected with the output end of a main motor (211) arranged at the top of the mixing tank (1), a main stirring blade (212) is fixedly arranged on the main stirring shaft (21), and one end of the secondary stirring shaft (22) is fixedly connected with the output end of a secondary motor (221) fixedly arranged at the top of the mixing tank (1); a secondary stirring blade (222) is fixedly arranged on the secondary stirring shaft (22); a spiral guide plate (3) is fixedly arranged on the inner wall of the mixing tank (1), and the spiral guide plate (3) extends from the top to the bottom of the mixing tank (1).

2. The phosphoric acid raw material mixing device according to claim 1, characterized by: The main stirring blade (212) and the secondary stirring blade (222) are different in shape and size.

3. The phosphoric acid raw material mixing device according to claim 1, characterized by: The main motor (211) and the secondary motor (221) are both speed-adjustable motors.

4. The phosphoric acid raw material mixing device according to claim 1, characterized by: The secondary stirring shaft (22) is provided with three secondary stirring shafts (22) which are arranged at equal intervals in a ring shape around the main stirring shaft (21).

5. The phosphoric acid raw material mixing device according to claim 4, characterized by: An inner gear ring (223) is rotatably embedded on the side of the top of the mixing tank (1), and the top of each of the three secondary stirring shafts (22) is fixedly sleeved with a gear (224) engaged with the inner gear ring (223).

6. The phosphoric acid raw material mixing device according to claim 5, wherein: The inner gear ring (223) and the gear (224) are provided with a protective shell (225) fixedly connected with the mixing tank (1) on the outside.

7. The phosphoric acid raw material mixing device according to claim 1, characterized by: A plurality of feeding ports (11) are arranged in a ring shape on the mixing tank (1), a feeding pipe (111) is fixedly arranged in each feeding port (11), a flowmeter (1111) is arranged on the feeding pipe (111), and an electromagnetic valve (1112) is arranged on the feeding pipe (111) corresponding to the feeding port (11) and the flowmeter (1111).

8. The phosphoric acid raw material mixing device according to claim 1, characterized by: A discharging pipe (121) is fixedly arranged in the discharging port (12), and a discharging valve (1211) is fixedly arranged on the discharging pipe (121).

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