Reaction kettle for preparing iron phosphate

Abstract

The utility model discloses a reaction kettle for phosphorus acid iron preparation, still be equipped with premixer on cauldron body, premixer includes venturi, the throat pipe department of venturi is equipped with hydrogen peroxide inlet pipe, and one -way inlet valve is equipped in hydrogen peroxide inlet pipe, and the outer end portion of hydrogen peroxide inlet pipe is connected with hydrogen peroxide supply equipment, and is provided with flow control valve on hydrogen peroxide inlet pipe, the convergent section of venturi is connected with mixed solution delivery pump road, and the diffusion end of venturi is connected with the outer end portion of injection pipe through the feeding line, the utility model discloses mixed solution under the effect of venturi carries out acceleration, and venturi sets up hydrogen peroxide inlet pipe at the throat pipe, so that the negative pressure adsorption to the throat pipe, and in the throat pipe inside and mixed solution collision, carry out the mixing.

Description

Technical Field

[0001] This utility model relates to the technical field of reaction vessels, specifically a reaction vessel for preparing ferric phosphate. Background Technology

[0002] The main uses of iron phosphate include battery materials, ceramics, catalysts, and fertilizer additives. In particular, it is used as a precursor in the production of lithium iron phosphate, a crucial cathode material for lithium batteries. Additionally, it may be used as a supplement to phosphate fertilizers in agriculture and for corrosion prevention or ceramic manufacturing in industry. Iron phosphate precipitates are formed by reacting iron salts (such as ferrous sulfate) with phosphates (such as sodium phosphate) in solution, controlling the pH value (usually 1.5-2.5). Common oxidants used are hydrogen peroxide (H2O2) or air. This process is mature and low-cost, but requires precise control of pH and impurities, and product purity depends on the quality of raw materials. Currently, iron salts and phosphorus sources are dissolved in deionized water at a Fe / P molar ratio of approximately 1:1 to form a mixed solution, and then an oxidant is added to the mixed solution for oxidation. Traditionally, hydrogen peroxide is directly poured into the reaction vessel, which can cause intense localized reactions, generating numerous bubbles that hinder mass transfer. Directly injected hydrogen peroxide concentrations can lead to ineffective decomposition, and the pH in unmixed areas increases (due to OH- accumulation), resulting in Fe... 3+ It hydrolyzes into Fe(OH)3 colloid. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention provides a reaction vessel for preparing ferric phosphate.

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0005] This utility model discloses a reaction vessel for preparing ferric phosphate, comprising a reaction vessel body consisting of a vessel body and a vessel lid. A stirring shaft is mounted on the vessel lid, and the stirring shaft has a hollow cavity inside.

[0006] The outer end of the stirring shaft is provided with an injection pipe that is inserted into the hollow cavity, and the outside of the injection pipe is provided with a sealing layer for sealing the connection between the hollow cavity and the injection pipe; the injection pipe rotates relative to the stirring shaft, and the stirring shaft is provided with a guide pipe communicating with the hollow cavity; the vessel body is also provided with a premixer, the premixer including a venturi tube, the throat of the venturi tube is provided with a hydrogen peroxide inlet pipe, the hydrogen peroxide inlet pipe is provided with a one-way inlet valve, the outer end of the hydrogen peroxide inlet pipe is connected to a hydrogen peroxide supply device, and the hydrogen peroxide inlet pipe is provided with a flow control valve; the constriction section of the venturi tube is connected to the mixed solution delivery pump circuit, and the diffusion end of the venturi tube is connected to the outer end of the injection pipe via a feeding pipeline.

[0007] As a preferred technical solution of this utility model, the venturi tube is provided with a non-powered flow bypass mechanism.

[0008] As a preferred technical solution of this utility model, the unpowered flow-around mechanism includes multiple spirally arranged flow-around plates disposed inside the throat of the venturi tube.

[0009] As a preferred technical solution of this utility model, the bottom of the vessel is provided with a microbubble generating mechanism, and the microbubble generating mechanism includes an annular gas pipe provided in the vessel and embedded in the vessel, and the annular gas pipe is provided with a plurality of micro holes, and the vessel is provided with a gas supply device for supplying gas to the annular gas pipe.

[0010] As a preferred embodiment of this utility model, a one-way air inlet valve is provided between the annular air pipe and the air supply device.

[0011] As a preferred technical solution of this utility model, the vessel body, vessel cover, stirring shaft, premixer, and non-powered flow mechanism are all made of acid-resistant materials.

[0012] The beneficial effects of this utility model are:

[0013] This reactor for preparing ferric phosphate incorporates a premixer to mix hydrogen peroxide and a mixture of ferrous sulfate and phosphoric acid. The ferrous sulfate and phosphoric acid mixture is accelerated by a Venturi tube, which has a hydrogen peroxide inlet at its throat. This hydrogen peroxide is drawn into the throat under negative pressure and collides with the ferrous sulfate and phosphoric acid mixture, causing mixing. Multiple spiral flow vanes inside the Venturi tube further circulate the mixture, ensuring uniform mixing and preventing violent localized reactions. A microbubble generator is located at the bottom of the reactor. Injecting air containing oxygen facilitates the oxidation reaction. These microbubbles have a 20-50 times larger specific surface area than traditional bubbles, significantly increasing the gas-liquid contact area. Continuous bubble impact prevents the aggregation of Fe(OH)3 colloids. Attached Figure Description

[0014] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0015] Figure 1 This is a schematic diagram of the structure of a reaction vessel for preparing ferric phosphate according to this utility model;

[0016] Figure 2 This is a schematic diagram of the structure of a premixer for a reaction vessel used in the preparation of ferric phosphate according to this utility model;

[0017] Figure 3 This is a schematic diagram of the non-powered flow-around mechanism of a reaction vessel for preparing ferric phosphate according to this utility model;

[0018] Figure 4 This is a schematic diagram of the annular gas pipe of a reaction vessel for preparing ferric phosphate according to this utility model.

[0019] In the diagram: 1. Reactor body; 2. Reactor lid; 3. Stirring shaft; 4. Hollow cavity; 5. Injection pipe; 6. Sealing layer; 7. Guide pipe; 8. Premixer; 9. Venturi tube; 10. Hydrogen peroxide inlet pipe; 11. One-way inlet valve; 12. Hydrogen peroxide supply equipment; 13. Flow control valve; 14. Mixed solution conveying pump circuit; 15. Feeding pipeline; 16. Non-powered flow bypass mechanism; 19. Flow bypass plate; 21. Annular gas pipe; 22. Micropore; 23. Gas supply equipment; 24. One-way inlet valve. Detailed Implementation

[0020] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0021] Example: Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, this utility model discloses a reaction vessel for preparing ferric phosphate, comprising a reaction vessel body 1 and a vessel cover 2. A stirring shaft 3 is mounted on the vessel cover 2, and the stirring shaft 3 has a hollow cavity 4 inside.

[0022] The outer end of the stirring shaft 3 is provided with an injection pipe 5 that is inserted into the hollow cavity 4, and the outside of the injection pipe 5 is provided with a sealing layer 6 for sealing the connection between the hollow cavity 4 and the injection pipe 5; the injection pipe 5 rotates relative to the stirring shaft 3, and the stirring shaft 3 is provided with a guide pipe 7 that communicates with the hollow cavity 4; the vessel body 1 is also provided with a premixer 8, the premixer 8 includes a venturi tube 9, the throat of the venturi tube 9 is provided with a hydrogen peroxide inlet pipe 10, and the hydrogen peroxide inlet pipe 10 is provided with a one-way inlet valve 11; the outer end of the hydrogen peroxide inlet pipe 10 is connected to a hydrogen peroxide supply device 12, and the hydrogen peroxide inlet pipe 9 is provided with a flow control valve 13; the constriction section of the venturi tube 10 is connected to the mixed solution conveying pump circuit 14, and the diffusion end of the venturi tube is connected to the outer end of the injection pipe 5 via a feeding pipe 15. The hydrogen peroxide and the mixed solution are mixed by setting up a premixer 8. The mixed solution is accelerated by the action of the venturi tube 9. The venturi tube 9 has a hydrogen peroxide inlet tube 10 at the throat. The hydrogen peroxide is adsorbed into the throat by negative pressure and collides with the mixed solution inside the throat, thus mixing and oxidizing.

[0023] The venturi tube 9 is equipped with a non-powered flow-around mechanism 16. This non-powered flow-around mechanism 16 includes multiple spirally arranged flow-around vanes 19 disposed inside the throat of the venturi tube 9. The multiple spirally arranged flow-around vanes 19 inside the throat of the venturi tube 9 then circulate the mixed solution around the hydrogen peroxide, ensuring uniform mixing and preventing violent localized reactions.

[0024] The bottom of the vessel body 1 is equipped with a microbubble generating mechanism, which includes an annular gas pipe 21 embedded in the vessel body 1. The annular gas pipe 21 has multiple micropores 22, and the vessel body 1 is equipped with a gas supply device 23 for supplying gas to the annular gas pipe 21. This invention utilizes a microbubble generating mechanism at the bottom of the vessel body 1. By injecting air containing oxygen, an oxidation reaction can occur. Furthermore, the microbubbles have a 20-50 times larger specific surface area than traditional bubbles, significantly increasing the gas-liquid contact area. Continuous bubble impact prevents the aggregation of Fe(OH)3 colloids.

[0025] The annular air pipe is equipped with a one-way air inlet valve 24 between itself and the air supply device to prevent backflow.

[0026] The vessel body 1, vessel cover 2, stirring shaft 3, premixer 8, and non-powered flow mechanism 16 are all made of acid-resistant materials, and all components are designed to be acid-resistant.

[0027] During operation, this ferric phosphate preparation reactor uses a premixer 8 to mix hydrogen peroxide and a mixed solution. The mixed solution is accelerated by a venturi tube 9, which has a hydrogen peroxide inlet 10 at its throat. The hydrogen peroxide is drawn into the throat under negative pressure and collides with the mixed solution inside the throat, thus mixing. Then, multiple spiral flow plates 19 inside the throat of the venturi tube 9 circulate the mixed solution, ensuring uniform mixing of the mixed solution and hydrogen peroxide and avoiding violent local reactions. Furthermore, a microbubble generator is located at the bottom of the reactor body 1. By injecting air containing oxygen, an oxidation reaction can be carried out. The microbubbles have a surface area 20-50 times larger than traditional bubbles, greatly expanding the gas-liquid contact area. Continuous bubble impact prevents the aggregation of Fe(OH)3 colloids.

[0028] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model 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 this utility model should be included within the protection scope of this utility model.

Claims

1. A reaction vessel for preparing ferric phosphate, comprising a reaction vessel body (1) and a vessel cover (2), wherein a stirring shaft (3) is mounted on the vessel cover (2), characterized in that, The stirring shaft (3) has a hollow cavity (4) inside. The outer end of the stirring shaft (3) is provided with an injection pipe (5) that is inserted into the hollow cavity (4), and the outside of the injection pipe (5) is provided with a sealing layer (6) for sealing the connection between the hollow cavity (4) and the injection pipe (5); the injection pipe (5) rotates relative to the stirring shaft (3), and the stirring shaft (3) is provided with a guide pipe (7) that communicates with the hollow cavity (4). The vessel body (1) is also provided with a premixer (8), which includes a venturi tube (9). The venturi tube (9) is provided with a hydrogen peroxide inlet pipe (10) at its throat, and a one-way inlet valve (11) is provided inside the hydrogen peroxide inlet pipe (10). The outer end of the hydrogen peroxide inlet pipe (10) is connected to a hydrogen peroxide supply device (12), and a flow control valve (13) is provided on the hydrogen peroxide inlet pipe (10). The constriction section of the venturi tube (9) is connected to the mixed solution conveying pump line (14), and the diffusion end provided on the venturi tube is connected to the outer end of the injection pipe (5) via a feeding pipe line (15).

2. The reaction vessel for preparing ferric phosphate according to claim 1, characterized in that, The Venturi tube (9) is equipped with a non-powered flow bypass mechanism (16).

3. The reaction vessel for preparing ferric phosphate according to claim 2, characterized in that, The unpowered flow mechanism (16) includes multiple spirally arranged flow vanes (19) disposed inside the throat of the venturi tube (9).

4. The reaction vessel for preparing ferric phosphate according to claim 1, characterized in that, The bottom of the vessel body (1) is provided with a microbubble generating mechanism, and the microbubble generating mechanism includes an annular gas pipe (21) provided in the vessel body (1) and embedded in the vessel body (1), and the annular gas pipe (21) is provided with a plurality of micro holes (22), and the vessel body (1) is provided with a gas supply device (23) for supplying gas to the annular gas pipe (21).

5. The reaction vessel for preparing ferric phosphate according to claim 4, characterized in that, A one-way air inlet valve (24) is provided between the annular air pipe and the air supply equipment.

6. A reaction vessel for preparing ferric phosphate according to any one of claims 1-5, characterized in that, The vessel body (1), vessel cover (2), stirring shaft (3), premixer (8), and non-powered flow mechanism (16) are all made of acid-resistant materials.

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