An oxidation device for iron phosphate

Abstract

The utility model discloses an oxidation device of iron phosphate, including reation kettle, stirring mechanism and reaction mechanism, is set up on the reation kettle and is drawn into the mouth, the discharge gate, the air inlet and the circulating liquid outlet, the stirring mechanism includes the drive mechanism who sets up in the reation kettle top and sets up in the stirring paddle of reation kettle, drive mechanism with stirring paddle is connected, the reaction mechanism includes the fluidic device, the oxidizing gas supply and the circulating pump, the air inlet of fluidic device with the oxidizing gas supply is connected, the liquid inlet of fluidic device is connected with circulating liquid outlet through circulating pump, the liquid outlet of fluidic device is connected with the air inlet through the fluidic pipe. Specifically, through the fluidic device impact material, strengthen mixing effect, thereby improve the efficiency and uniformity of iron phosphate oxidation process.

Description

Technical Field

[0001] This utility model relates to the technical field of ferric phosphate production, and in particular, to an oxidizing device for ferric phosphate. Background Technology

[0002] Iron phosphate is a key precursor for the preparation of lithium iron phosphate (LFP), a cathode material for lithium-ion batteries. Its preparation typically employs an aqueous phase method, which involves mixing a ferrous salt solution with a phosphoric acid (or phosphate) solution under specific conditions, and then introducing an oxidizing agent (such as air, oxygen, or hydrogen peroxide) to oxidize ferrous ions to ferric ions, thereby precipitating iron phosphate. The efficiency and uniformity of this oxidation process directly determine key indicators such as the purity, particle size distribution, and morphology of the iron phosphate product, thus affecting the final electrochemical performance of the lithium iron phosphate material. Utility Model Content

[0003] This invention provides an oxidation device for ferric phosphate to solve the technical problem of improving the efficiency and uniformity of the ferric phosphate oxidation process.

[0004] An oxidation device for ferric phosphate according to this utility model includes a reaction vessel, a stirring mechanism, and a reaction mechanism. The reaction vessel is provided with a feed inlet, a discharge outlet, a gas inlet, and a circulating liquid outlet. The stirring mechanism includes a drive mechanism disposed at the top of the reaction vessel and a stirring paddle disposed inside the reaction vessel. The drive mechanism is connected to the stirring paddle. The reaction mechanism includes an ejector, an oxidizing gas supplier, and a circulating pump. The gas inlet of the ejector is connected to the oxidizing gas supplier, the liquid inlet of the ejector is connected to the circulating liquid outlet through the circulating pump, and the liquid outlet of the ejector is connected to the gas inlet through an ejection pipe.

[0005] Furthermore, the driving mechanism includes a drive motor and a base, the base being fixedly connected to the reactor, the drive motor being fixed on the base, and the output shaft of the drive motor extending into the reactor and connected to the stirring paddle.

[0006] Furthermore, the stirring paddle includes a main stirring rod and an auxiliary stirring rod. The main stirring rod is connected to the output shaft of the drive motor, and the auxiliary stirring rod includes an L-shaped connecting frame connected to the main stirring rod and a stirring blade connected to the free end of the L-shaped connecting frame.

[0007] Furthermore, the stirring rod is a helical rod.

[0008] Furthermore, multiple sets of stirring auxiliary rods are provided, and the multiple sets of stirring auxiliary rods are evenly distributed along the circumference.

[0009] Furthermore, the pipe connected to the liquid outlet end of the jet injector extends into the interior of the reactor, with its outlet facing the bottom or side wall of the reactor.

[0010] Furthermore, the reactor is equipped with a monitoring and control assembly, which includes a pH sensor, a temperature sensor, a flow control valve, and a controller. The pH sensor and temperature sensor both extend into the reactor to detect the pH value and temperature of the material inside, respectively. The flow control valve is located on the gas pipeline between the oxidizing gas supplier and the ejector to regulate the flow rate of the oxidizing gas. The signal output terminals of the pH sensor and temperature sensor are electrically connected to the signal input terminal of the controller, and the signal output terminal of the controller is electrically connected to the control terminals of the flow control valve and the circulating pump.

[0011] Furthermore, the inner wall of the reactor is provided with at least one baffle.

[0012] Furthermore, the reactor is provided with a jacket, and the jacket is provided with a cooling medium inlet and a cooling medium outlet.

[0013] Furthermore, the oxidizing gas supply device is one of an air compressor, an oxygen cylinder, or an ozone generator.

[0014] This utility model has the following beneficial effects:

[0015] In the ferric phosphate oxidation device of this invention, ferrous salt solution and phosphoric acid solution are added and mixed in a suitable ratio through the feed inlet. Then, the drive mechanism is started to stir the mixed raw materials with a stirring paddle to ensure thorough mixing. Then, the circulation pump, oxidizing gas supply and ejector are turned on to put the material into circulation. Specifically, the circulation pump draws the material in the reactor through the circulation outlet and delivers it to the liquid inlet of the ejector. The oxidizing gas supply introduces oxidizing gas into the gas inlet of the ejector. Inside the ejector, the high-speed material generates negative pressure, breaking the gas into tiny bubbles, which greatly increases the gas-liquid contact area, thereby improving the reaction efficiency and achieving efficient gas-liquid mixing. The mixed material extends into the reactor through the ejector pipe, and the outlet flows back towards the bottom or side wall. The material ejected by the ejector forms a directional impact flow. This impact not only breaks up the material stratification in the reactor, but also drives the material deposited at the bottom to flow upward, forming a synergistic effect with the stirring mechanism, eliminating dead zones in the stirring, and making the ferrous ion concentration distribution in the reactor more uniform, avoiding incomplete local oxidation. In summary, by further impacting the material through the jet injector, the mixing effect is enhanced, thereby improving the efficiency and uniformity of the ferric phosphate oxidation process.

[0016] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The present utility model will now be described in further detail with reference to the figures. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0018] Figure 1 This is a schematic diagram of the structure of the ferric phosphate oxidation device according to a preferred embodiment of the present invention;

[0019] Figure 2 This is a front view of the ferric phosphate oxidation apparatus according to a preferred embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the internal structure of the ferric phosphate oxidation device according to a preferred embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of the structure of the stirring paddle in a preferred embodiment of the present invention.

[0022] Legend:

[0023] 100. Reactor; 101. Feed inlet; 102. Discharge outlet; 103. Air inlet; 104. Circulating liquid outlet; 105. Baffle;

[0024] 200. Base; 201. Drive motor; 202. Main stirring rod; 203. Auxiliary stirring rod; 204. Stirring blades; 205. L-shaped connecting frame;

[0025] 300. Ejector; 301. Oxidizing gas supplier; 302. Circulating pump;

[0026] 400. pH sensor; 401. Temperature sensor; 402. Flow control valve; 403. Controller;

[0027] 500, Jacket; 501, Cooling medium inlet; 502, Cooling medium outlet. Detailed Implementation

[0028] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0029] like Figures 1-3As shown, this utility model discloses an oxidation device for iron phosphate, including a reaction vessel 100, a stirring mechanism, and a reaction mechanism. The reaction vessel 100 has a feed inlet 101, a discharge outlet 102, an air inlet 103, and a circulating liquid outlet 104. The stirring mechanism includes a drive mechanism disposed on the top of the reaction vessel 100 and a stirring paddle disposed inside the reaction vessel 100, and the drive mechanism is connected to the stirring paddle. The reaction mechanism includes an ejector 300, an oxidizing gas supplier 301, and a circulating pump 302. The air inlet of the ejector 300 is connected to the oxidizing gas supplier 301, the liquid inlet of the ejector 300 is connected to the circulating liquid outlet 104 through the circulating pump 302, and the liquid outlet of the ejector 300 is connected to the air inlet 103 through an ejection pipe.

[0030] Specifically, the reactor 100 is made of stainless steel. The inlet of the circulating pump 302 is connected to the circulating outlet 104 through a pipe, and the outlet is connected to the inlet of the ejector 300 through a pipe. The oxidizing gas supplier 301 is made of oxygen cylinder, and its outlet is connected to the inlet of the ejector 300 through a pipe. A flow control valve 402 is installed on the pipe. The outlet of the ejector 300 is connected to the inlet 103 of the reactor 100 through a jet pipe. The end of the jet pipe extends into the interior of the reactor 100, and the outlet faces the bottom.

[0031] In this embodiment, ferrous salt solution and phosphoric acid solution are added and mixed in a suitable ratio through inlet 101. Then, the drive mechanism is started to stir the mixed raw materials with a stirring paddle to ensure thorough mixing. Then, the circulation pump 302, oxidizing gas supplier 301, and ejector 300 are turned on to circulate the material. Specifically, the circulation pump 302 draws the material in the reactor 100 through the circulation outlet 104 and delivers it to the liquid inlet of the ejector 300. The oxidizing gas supplier 301 introduces oxidizing gas into the gas inlet of the ejector 300. Inside the ejector 300, the high-speed material generates negative pressure, breaking the gas into tiny bubbles, which greatly increases the gas-liquid contact area, thereby improving the reaction efficiency and achieving efficient gas-liquid mixing. The mixed material extends into the reactor 100 through the ejector pipe, and the outlet flows back towards the bottom or side wall. The material ejected from the ejector 300 forms a directional impact flow. This impact not only breaks up the material stratification within the reactor 100, but also drives the bottom-deposited material upwards, working synergistically with the stirring mechanism to eliminate dead zones and ensure a more uniform distribution of ferrous ion concentration within the reactor 100. This prevents incomplete local oxidation. Finally, a sample is taken to test the ferrous ion content in the material (≤0.1%) to confirm the completion of the oxidation reaction. The drive motor 201, circulation pump 302, and oxidation gas supply 301 are then shut off, and the outlet valve 102 is opened to discharge the ferric phosphate slurry for subsequent filtration and washing processes. In summary, the jet injector 300 further impacts the material, enhancing the mixing effect and thus improving the efficiency and uniformity of the ferric phosphate oxidation process.

[0032] Furthermore, the driving mechanism includes a drive motor 201 and a base 200. The base 200 is fixedly connected to the reaction vessel 100, the drive motor 201 is fixed on the base 200, and the output shaft of the drive motor 201 extends into the reaction vessel 100 and is connected to the stirring paddle.

[0033] In this embodiment, the base 200 is fixed to the top center of the reactor 100 by bolts or welding, and the drive motor 201 is fixed to the base 200. Its output shaft extends into the reactor 100 through a mechanical seal and is connected to the stirring paddle. The length of the main spiral rod of the stirring paddle extends to the top of the reactor 100. Four sets of L-shaped auxiliary rods are evenly welded along the circumference on the main spiral rod. The free end of each set of auxiliary rods is connected to a rectangular stirring blade 204. The distance between the stirring blade 204 and the inner wall of the reactor 100 is 50mm.

[0034] Reference Figure 4The stirring paddle includes a main stirring rod 202 and an auxiliary stirring rod 203. The main stirring rod 202 is connected to the output shaft of the drive motor 201. The auxiliary stirring rod 203 includes an L-shaped connecting frame connected to the main stirring rod 202 and a stirring blade 204 connected to the free end of the L-shaped connecting frame. In this embodiment, the main stirring rod 202 performs the main stirring function, while the auxiliary stirring rod 203 can stir the raw materials at the edge and bottom of the tank, improving the uniformity of stirring.

[0035] Furthermore, the stirring main rod 202 is a helical rod. The helical structure of the stirring main rod 202 allows the slurry to tumble up and down during the stirring process, enhancing the stirring effect.

[0036] Furthermore, multiple sets of stirring auxiliary rods 203 are provided, and these sets are evenly distributed circumferentially. In this example, multiple sets of stirring auxiliary rods 203 are provided to stir the slurry from multiple directions, further improving the stirring uniformity. Specifically, four sets of stirring auxiliary rods 203 are provided, evenly distributed circumferentially on the main stirring rod 202. Each set of stirring auxiliary rods 203 includes an L-shaped connecting frame connected to the main stirring rod 202 and a stirring blade 204 connected to the free end of the L-shaped connecting frame. The stirring blade 204 is located near the inner wall and bottom of the tank. The stirring mechanism adopts a combination structure of the main stirring rod 202 and multiple sets of stirring auxiliary rods 203, which can stir the slurry in the tank in all directions, improving the stirring uniformity.

[0037] Furthermore, the pipe connected to the liquid outlet end of the ejector 300 extends into the interior of the reactor 100, with its outlet facing the bottom or side wall of the reactor 100. In this embodiment, the mixed material extends into the interior of the reactor 100 through the ejection pipe, and the outlet flows back towards the bottom or side wall, forming a directional impact flow after being ejected by the ejector 300. This impact not only breaks up the material stratification within the reactor 100 but also drives the material deposited at the bottom to flow upwards, working synergistically with the stirring mechanism to eliminate dead zones and make the ferrous ion concentration distribution within the reactor 100 more uniform.

[0038] Furthermore, the reactor 100 is equipped with a monitoring and control assembly, which includes a pH sensor, a temperature sensor 401, a flow control valve 402, and a controller 403. The pH sensor and the temperature sensor 401 both extend into the reactor 100 and are used to detect the pH value and temperature of the material inside the reactor 100, respectively. The flow control valve 402 is located on the gas pipeline between the oxidizing gas supplier 301 and the ejector 300 and is used to regulate the flow rate of the oxidizing gas. The signal output terminals of the pH sensor and the temperature sensor 401 are electrically connected to the signal input terminal of the controller 403, and the signal output terminal of the controller 403 is electrically connected to the control terminals of the flow control valve 402 and the circulating pump 302.

[0039] In this embodiment, the reaction of ferric phosphate causes a change in pH and releases heat. The controller 403 has preset optimal pH and temperature ranges. When the pH sensor detects that the pH value decreases too quickly or too slowly, the controller 403 can adjust the flow control valve 402 to change the oxygen supply rate, or adjust the rate of the circulating pump 302 to change the reaction intensity so that the oxidation reaction of ferric phosphate is always under optimal conditions. When the temperature sensor 401 detects that the temperature is too high, the controller 403 can adjust the temperature of the water flowing into the jacket 500 accordingly. This closed-loop control ensures that the reaction always proceeds under optimal conditions.

[0040] Furthermore, the inner wall of the reactor 100 is provided with multiple baffles 105 spaced apart circumferentially. In this embodiment, when the stirring paddle rotates at high speed, the material inside the reactor 100 will form a vortex rotating along the reactor wall due to centrifugal force. In this flow mode, the material mainly circulates axially, with weak radial mixing, which easily leads to local material stagnation. The baffles 105 can directly block the vortex motion, converting rotational kinetic energy into radial and axial turbulent energy, forcing the material to flow towards the stirring center, forming a more complex convection circulation, thereby eliminating the "rotational slippage" phenomenon and improving the overall mixing uniformity.

[0041] Furthermore, a jacket 500 is provided on the outside of the reactor 100, and a cooling medium inlet 501 and a cooling medium outlet 502 are provided on the jacket 500. By providing the jacket 500, water at a certain temperature can be introduced into the jacket 500, thereby regulating the temperature inside the reactor 100. Specifically, the jacket 500 is usually tightly fitted to the outer wall of the reactor 100, and the water can form a circulating flow within the jacket 500, which can ensure uniform heating / cooling in all areas of the reactor and avoid uneven material reaction caused by local temperature differences. This overall temperature control method is gentler than directly inserting heat exchange tubes into the reactor, reduces interference with the material flow field, and further improves temperature uniformity when combined with a stirring mechanism.

[0042] Furthermore, the oxidizing gas supply device is one of an air compressor, an oxygen cylinder, or an ozone generator. The oxidizing gas is used to increase the oxidizing gas flow in the reaction and ensure sufficient oxygen.

[0043] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. 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. An apparatus for oxidizing iron phosphate, characterized in that, include: The reactor (100) is provided with a feed inlet (101), a discharge outlet (102), an air inlet (103), and a circulating liquid outlet (104); The stirring mechanism includes a drive mechanism disposed on the top of the reactor (100) and a stirring paddle disposed inside the reactor (100), wherein the drive mechanism is connected to the stirring paddle; The reaction mechanism includes an ejector (300), an oxidizing gas supplier (301), and a circulating pump (302). The air inlet of the ejector (300) is connected to the oxidizing gas supplier (301), the liquid inlet of the ejector (300) is connected to the circulating liquid outlet (104) through the circulating pump (302), and the liquid outlet of the ejector (300) is connected to the air inlet (103) through an ejector pipe.

2. The ferric phosphate oxidation apparatus according to claim 1, characterized in that, The driving mechanism includes a drive motor (201) and a base (200). The base (200) is fixedly connected to the reactor (100). The drive motor (201) is fixed on the base (200). The output shaft of the drive motor (201) extends into the reactor (100) and is connected to the stirring paddle.

3. The ferric phosphate oxidation apparatus according to claim 2, characterized in that, The stirring paddle includes a stirring main rod (202) and a stirring auxiliary rod (203). The stirring main rod (202) is connected to the output shaft of the drive motor (201). The stirring auxiliary rod (203) includes an L-shaped connecting frame connected to the stirring main rod (202) and a stirring blade (204) connected to the free end of the L-shaped connecting frame.

4. The ferric phosphate oxidation apparatus according to claim 3, characterized in that, The stirring rod (202) is a screw rod.

5. The ferric phosphate oxidation apparatus according to claim 4, characterized in that, The stirring auxiliary rod (203) is provided in multiple sets, and the multiple sets of stirring auxiliary rods (203) are evenly distributed in the circumferential direction.

6. The ferric phosphate oxidation apparatus according to claim 1, characterized in that, The pipe connected to the liquid outlet end of the jet injector (300) extends into the interior of the reactor (100), with its outlet facing the bottom or side wall of the reactor (100).

7. The ferric phosphate oxidation apparatus according to claim 1, characterized in that, The reactor (100) is equipped with a monitoring and control component, which includes a pH sensor, a temperature sensor (401), a flow control valve (402), and a controller (403). The pH sensor and the temperature sensor (401) extend into the reactor (100) to detect the pH value and temperature of the material inside the reactor (100), respectively. The flow control valve (402) is located on the gas pipeline between the oxidizing gas supplier (301) and the ejector (300) to regulate the flow rate of the oxidizing gas. The signal output terminals of the pH sensor and the temperature sensor (401) are electrically connected to the signal input terminal of the controller (403), and the signal output terminal of the controller (403) is electrically connected to the control terminals of the flow control valve (402) and the circulating pump (302).

8. The oxidizing apparatus for iron phosphate according to claim 1, characterized in that, The inner wall of the reactor (100) is provided with a plurality of baffles (105) distributed circumferentially.

9. The oxidizing apparatus for iron phosphate according to claim 1, characterized in that, The reactor (100) is provided with a jacket (500) on the outside, and the jacket (500) is provided with a cooling medium inlet (501) and a cooling medium outlet (502).

10. The oxidizing apparatus for iron phosphate according to any one of claims 1 to 9, characterized in that, The oxidizing gas supply (301) is one of an air compressor, an oxygen cylinder, or an ozone generator.

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