Device and method for preparing iron phosphate by using waste batteries

Abstract

The invention relates to the field of waste battery recycling, and discloses a device and a method for preparing iron phosphate by using waste batteries, the device comprises an acid leaching kettle, a filtrate impurity removal kettle, a synthesis kettle and an aging crystallization kettle which are communicated in sequence, and a material lifting pipe, a sulfuric acid pump and a water supply pump which are communicated with the acid leaching kettle are arranged on the side surface of the acid leaching kettle; after a solution obtained after acid leaching flows into the first pressurization channel of the tank body through the communicating pipe, the solution rises into the first temporary storage cavity to be temporarily stored, an overflow communicating hole is formed in the lower end of the first temporary storage cavity, and when the liquid level reaches a certain height, the solution flows into the second pressurization channel through the overflow communicating hole; when the first electric push rod drives the pressurization filtering part to ascend, the pressurization filtering part covers a port of the overflow communication hole, at the moment, the solution in the second pressurization channel downwards leaks to the second temporary storage cavity under the pressure effect, impurities in the solution cannot pass through the filtering holes to be intercepted in the second pressurization channel, and efficient separation of the solution and the impurities is achieved.

Description

Technical Field

[0001] The present invention relates to the field of recycling of waste batteries, and specifically to an apparatus and method for preparing iron phosphate using waste batteries. Background Art

[0002] The preparation of iron phosphate from phosphorus iron slag mainly includes acid leaching, pressure filtration, impurity removal from the filtrate, synthesis, pressure filtration and washing, pulping, aging and crystallization, and pressure filtration and washing. In the prior art, after leaching the iron and phosphorus elements in lithium iron phosphate batteries by the acid leaching method, when separating the leaching solution from the tail slag, the solid-liquid separation method is generally used for separation. However, there will still be some debris mixed in the leaching solution, which affects the purity of the precipitate obtained in the subsequent precipitation and crystallization processes. Summary of the Invention

[0003] The present invention provides an apparatus and method for preparing iron phosphate using waste batteries, which overcomes the deficiencies described in the background art.

[0004] The technical solution adopted by the present invention to solve its technical problems is as follows: An apparatus for preparing iron phosphate using waste batteries includes an acid leaching kettle, a filtrate impurity removal kettle, a synthesis kettle, and an aging and crystallization kettle connected in sequence. A material lifting pipe, a sulfuric acid pump, and a water supply pump are provided on the side of the acid leaching kettle and are connected to the acid leaching kettle. The material lifting pipe is connected to the side of the acid leaching kettle, while the sulfuric acid pump and the water supply pump are connected to the upper end of the acid leaching kettle. A metering valve is connected to the side of the synthesis kettle, and the metering valve is connected to the filtrate impurity removal kettle through a suction pump three, so as to extract the solution in the filtrate impurity removal kettle to the metering valve through the suction pump three and flow into the synthesis kettle for precipitation. A feeding port is provided on the surface of the aging and crystallization kettle, and a quantitative weighing scale is provided on the side of the aging and crystallization kettle, so as to put the material on its surface into the aging and crystallization kettle through the quantitative weighing scale. The filtrate impurity removal kettle includes a tank body, a pH meter for detecting the acidity and alkalinity in the tank body, and a thermometer for detecting the temperature in the tank body. The pH meter and the thermometer are both inserted into the tank body; A pressure increasing channel one, a temporary cavity one, a temporary cavity two, and a pressure increasing channel two are provided in the tank body. The pressure increasing channel one is connected to the upper end of the temporary cavity one, the pressure increasing channel two is connected to the upper end of the temporary cavity two, and the temporary cavity one is connected to the pressure increasing channel two through an overflow connection hole provided at its lower end. The acid leaching kettle is connected to the pressure increasing channel one through a connecting pipe; A pressure increasing filter element is provided near the port of the overflow connection hole in the pressure increasing channel two. The pressure increasing filter element is driven to lift and lower by an electric push rod one. The overflow connection hole is connected to the upper part of the pressure increasing channel two. When the pressure increasing filter element descends, the overflow connection hole is connected to the pressure increasing channel two. When the pressure increasing filter element ascends, the pressure increasing filter element covers the port of the overflow connection hole and squeezes the solution in the pressure increasing channel two, so that the solution leaks downward through the pressure increasing filter element into the temporary cavity two.

[0005] A preferred technical solution is that the pressurization channel II is divided into upper and lower solution chambers by a pressurization filter element. The pressurization filter element includes an outer shell, a filter layer and a pressurization part arranged inside the outer shell. The filter layer is connected to the output shaft of the electric push rod I. A filter chamber is arranged between the filter layer and the pressurization part. The surface of the pressurization part is arrayed with conical grooves that gradually deepen from the edge to the middle. The lower ends of all the pressurization parts are provided with a reverse osmosis membrane layer. The pressurization part covers the surface of the reverse osmosis membrane layer. When the electric push rod I drives the pressurization filter element to rise, the covered port squeezes the solution in the upper solution chamber, so that the solution sequentially permeates through the filter layer, the filter chamber and the reverse osmosis membrane layer and then flows into the lower solution chamber.

[0006] A preferred technical solution is that a pumping pump II is connected between the overflow communication hole and the pressurization channel II to pump the solution in the temporary storage chamber I into the pressurization channel II through the pumping pump II. When the pressurization filter element rises and covers the port of the overflow communication hole, the pumping pump II stops pumping the solution. When the pressurization filter element descends, the pumping pump II pumps the solution to the surface of the filter layer.

[0007] A preferred technical solution is that a one-way valve is arranged in the pressurization channel I. The high-resistance direction of the one-way valve is opposite to the flowing direction of the solution in the pressurization channel I. An inclined surface is arranged at the lower side of the inner end of the pressurization channel I near the connection end with the temporary storage chamber I. The inclined surface is arrayed with a plurality of protruding slow-flow convex parts; A filter element is arranged at the communication end of the pressurization channel I and the temporary storage chamber II. A pressurization part I is also arranged in the middle of the pressurization channel I. A piston block is arranged in the pressurization part I, and the pressurization part I communicates with the outside through a hole. The piston block is driven to lift and lower by an electric push rod II. When the electric push rod II squeezes the piston block downward, the piston block blocks the port of the hole and pressurizes the solution between the one-way valve and the filter element, so that the solution seeps into the temporary storage chamber I from the filter element. When the piston block rises, the air in the pressurization part I is discharged to the outside through the hole.

[0008] A preferred technical solution is that a through hole is arranged in the tank body, and a floating float is arranged in the temporary storage chamber I. The floating float penetrates through the through hole from the inside to the outside and extends to the outside of the tank body; The floating float includes a floating block and an air pipe. The fixing block is fixed at the port of the through hole. The floating block penetrates through the fixing block, and the floating block is fixed at the lower end of the air pipe. The air pipe is of a hollow structure, and the lower part of the air pipe communicates with the outside through a plurality of air holes, so that air flows through the air holes and the inner end of the air pipe; The filling cushion block is composed of an inner ring and an outer ring. The inner and outer rings are connected and fixed by a plurality of connecting pieces. A flow channel for gas flow is formed between two adjacent connecting pieces, and a rolling ball is arranged on the surface of the inner ring.

[0009] A usage method of the device for preparing iron phosphate by using waste batteries as described above, the usage method includes the following steps: S1: Put the waste batteries to be recycled into the acid leaching kettle, add sulfuric acid into the acid leaching kettle through the sulfuric acid pump, and add water into the acid leaching kettle through the sulfuric acid pump. Soak the waste batteries with sulfuric acid and water to form acid leaching, and leach out the iron and phosphorus elements in the waste batteries. S2: Use the extraction pump 1 to extract the solution formed after the acid leaching treatment of the waste batteries in the acid leaching kettle into the filtrate impurity removal kettle. Separate the solution and the tailings in the solution through the filtrate impurity removal kettle to increase the content of iron and phosphorus elements in the solution. S3: Use the extraction pump 3 to extract the solution in the filtrate impurity removal kettle to the metering valve. By adjusting the pH value and temperature, make the iron and phosphorus in the solution exist in the form of iron phosphate mixture. S4: Put the iron phosphate mixture to the quantitative weighing scale, and according to the preset specific weight, put the iron phosphate mixture into the aging crystallization kettle for precipitation and crystallization. Use the shear pump set in the aging crystallization kettle to scrape off the iron phosphate mixture crystals formed on the inner surface of the aging crystallization kettle.

[0010] A preferred technical solution, in which, when separating the solution and the tailings in the solution through the filtrate impurity removal kettle 2, it is necessary to squeeze the solution in the pressure - adding channel 111 through the electric push rod 24 and squeeze the solution in the upper solution cavity set in the pressure - adding channel 214 through the pressure - adding filter element 2141 to achieve secondary pressure - adding impurity removal.

[0011] Compared with the prior art, this technical solution has the following advantages: When the solution after acid leaching flows into the first pressure - adding channel of the tank body through the connecting pipe, the liquid will rise to the first temporary storage cavity for temporary storage. There is an overflow connecting hole at the lower end of the first temporary storage cavity. When the liquid level reaches a certain height, the liquid will flow into the second pressure - adding channel through the overflow connecting hole. In the second pressure - adding channel, when the electric push rod 1 drives the pressure - adding filter element to rise, the pressure - adding filter element will cover the port of the overflow connecting hole. At this time, under the action of pressure, the solution in the second pressure - adding channel will leak downward through the fine filter holes of the pressure - adding filter element to the second temporary storage cavity, while the impurities in the solution cannot pass through the filter holes and are intercepted in the second pressure - adding channel, realizing the efficient separation of the solution and the impurities.

[0012] When the electric push rod 1 drives the pressure - adding filter element to rise, the solution in the second pressure - adding channel leaks downward through the pressure - adding filter element under the action of pressure, while the impurities are intercepted in the second pressure - adding channel, effectively removing tiny impurities, improving the purity of the solution, and providing a high - quality solution for the subsequent process. Brief Description of the Drawings

[0013] The following further describes the present invention in conjunction with the drawings and embodiments.

[0014] Figure 1 It is the overall view of the present invention.

[0015] Figure 2 It is a schematic diagram of the filtrate impurity removal kettle.

[0016] Figure 3 It is a schematic diagram of the second pressure channel.

[0017] Figure 4 It is a schematic diagram of the pressure filter element.

[0018] Figure 5 It is a schematic diagram of the structure of the pressure filter element.

[0019] Figure 6 It is a schematic diagram of the slow flow raised part.

[0020] Figure 7 It is a schematic diagram of the float.

[0021] Figure 8 It is a schematic diagram of the filling cushion block.

[0022] In the figure: acid leaching kettle 1, material lifting pipe 11, sulfuric acid pump 12, water supply pump 13, extraction pump one 14; Filtrate impurity removal kettle 2, tank body 21, pH meter 22, thermometer 23, electric push rod two 24, regulating valve 25, extraction pump two 26; First pressure channel 211, first temporary cavity 212, second temporary cavity 213, second pressure channel 214, through hole 215; One-way valve 2111, first pressurizing part 2112, filter element 2113, slow flow raised part 2114; Overflow communication hole 2121, float 2122; Pressure filter element 2141, outer shell 1411, filter layer 1412, pressurizing part 1413, conical groove 1414, reverse osmosis membrane layer 1415, electric push rod one 2142; Fixed block 1221, floating block 1222, air pipe 1223, air vent 2231, filling cushion block 1224, flow channel 2241, ball 2242; Synthesis kettle 3, metering valve 31, extraction pump three 32; Aging and crystallization kettle 4, quantitative weighing scale 41. Specific implementation method

[0023] Such as Figures 1 to 8As shown, in the present invention, a device and method for preparing iron phosphate from waste batteries are proposed, including an acid leaching kettle 1, a filtrate impurity removal kettle 2, a synthesis kettle 3, and an aging crystallization kettle 4 connected in sequence. A material lifting pipe 11, a sulfuric acid pump 12, and a water supply pump 13 are provided on the side of the acid leaching kettle 1 and are connected to the acid leaching kettle 1. The material lifting pipe 11 is connected to the side of the acid leaching kettle 1, while the sulfuric acid pump 12 and the water supply pump 13 are connected to the upper end of the acid leaching kettle 1. A quantitative valve 31 is connected to the side of the synthesis kettle 3, and the quantitative valve 31 is connected to the filtrate impurity removal kettle 2 through a third extraction pump 32, so as to extract the solution in the filtrate impurity removal kettle 2 to the quantitative valve 31 through the third extraction pump 32 and flow into the synthesis kettle 3 for precipitation. A feeding port is provided on the surface of the aging crystallization kettle 4, and a quantitative weighing scale 41 is provided on the side of the aging crystallization kettle 4, so as to put the substances on its surface into the aging crystallization kettle 4 through the quantitative weighing scale 41. The filtrate impurity removal kettle 2 includes a tank body 21, a pH meter 22 for detecting the acidity and alkalinity in the tank body 21, and a thermometer 23 for detecting the temperature in the tank body 21. The pH meter 22 and the thermometer 23 are both inserted into the tank body 21; A first pressure channel 211, a first temporary cavity 212, a second temporary cavity 213, and a second pressure channel 214 are provided in the tank body 21. The first pressure channel 211 is connected to the upper end of the first temporary cavity 212, the second pressure channel 214 is connected to the upper end of the second temporary cavity 213, and the first temporary cavity 212 is connected to the second pressure channel 214 through an overflow communication hole 2121 provided at its lower end. The acid leaching kettle 1 is connected to the first pressure channel 211 through a connecting pipe; A pressure filtering member 2141 is provided near the port of the overflow communication hole 2121 in the second pressure channel 214. The pressure filtering member 2141 is driven to lift and lower by an electric push rod 2142. The overflow communication hole 2121 is connected to the upper part of the second pressure channel 214. When the pressure filtering member 2141 descends, the overflow communication hole 2121 is connected to the second pressure channel 214. When the pressure filtering member 2141 ascends, the pressure filtering member 2141 covers the port of the overflow communication hole 2121 and squeezes the solution in the second pressure channel 214, so that the solution leaks downward through the pressure filtering member 2141 into the second temporary cavity 213.

[0024] When the solution after acid leaching flows into the first pressurized channel 211 of the tank body 21 through the connecting pipe, the liquid will rise into the first temporary storage cavity 212 for temporary storage. An overflow connecting hole 2121 is provided at the lower end of the first temporary storage cavity 212. When the liquid level reaches a certain height, the liquid will flow into the second pressurized channel 214 through the overflow connecting hole 2121. In the second pressurized channel 214, a pressurized filter element 2141 is provided near the port of the overflow connecting hole 2121. When the first electric push rod 2142 drives the pressurized filter element 2141 to rise, the pressurized filter element 2141 will cover the port of the overflow connecting hole 2121. At this time, the solution in the second pressurized channel 214 will, under the action of pressure, penetrate through the fine filter holes of the pressurized filter element 2141 and leak downward into the second temporary storage cavity 213, while the impurities in the solution are intercepted in the second pressurized channel 214, realizing the efficient separation of the solution and the impurities.

[0025] As can be seen from the above, the second pressurized channel 214 in the tank body 21 plays a key role in the process of pressurized filtration of solution impurities, and its beneficial effects are mainly reflected in the following aspects: First, the second pressurized channel 214, in cooperation with the pressurized filter element 2141 and the first electric push rod 2142, can efficiently pressurize and filter the solution flowing into it. When the first electric push rod 2142 drives the pressurized filter element 2141 to rise, the solution in the second pressurized channel 214 will, under the action of pressure, penetrate through the pressurized filter element 2141 and leak downward into the second temporary storage cavity 213, while the impurities are intercepted in the second pressurized channel 214, effectively removing tiny impurities, improving the purity of the solution, and providing a high-quality solution for the subsequent processes. Second, this filtering method of the second pressurized channel 214 makes the filtering process more stable. The precise control of the first electric push rod 2142 ensures the smooth lifting and lowering of the pressurized filter element 2141, thus ensuring the continuity of filtration, being conducive to large-scale industrial production, and improving the overall production efficiency. Third, the filtering operation in the second pressurized channel 214 is carried out inside the closed tank body 21, avoiding the leakage of harmful substances, ensuring the safety of the production environment. At the same time, it reduces the wear of impurities on the subsequent equipment, reduces the equipment maintenance cost and frequency, and can also reduce the workload of the operators. Only by controlling the lifting and lowering action of the first electric push rod 2142 can the filtration be completed, which is convenient for operation and management.

[0026] Among them, the second pressurizing channel 214 is divided into upper and lower solution chambers by a pressurizing filter element 2141. The pressurizing filter element 2141 includes an outer housing 1411, a filter layer 1412 and a pressurizing part 1413 arranged inside the outer housing 1411. The filter layer 1412 is connected to the output shaft of the first electric push rod 2142. A filter chamber is arranged between the filter layer 1412 and the pressurizing part 1413. The surface of the pressurizing part 1413 is arrayed with conical grooves 1414 that gradually deepen from the edge to the middle. A reverse osmosis membrane layer 1415 is provided at the lower end of all the pressurizing parts 1413. The pressurizing part 1413 covers the surface of the reverse osmosis membrane layer 1415. When the first electric push rod 2142 drives the pressurizing filter element 2141 to rise, it covers the port of 2121 and squeezes the solution in the upper solution chamber, so that the solution sequentially permeates through the filter layer 1412, the filter chamber and the reverse osmosis membrane layer 1415 and then flows into the lower solution chamber; The second pressurizing channel 214 is divided into upper and lower solution chambers by the pressurizing filter element 2141, and this structural setting brings significant beneficial effects. First of all, when the pressurizing filter element 2141 rises, the upper solution chamber can initially pressurize and filter the solution through the cooperation of the outer housing 1411 and the pressurizing part 1413. When the first electric push rod 2142 drives the pressurizing filter element 2141 to rise, the conical grooves 1414 on the surface of the pressurizing part 1413 can increase the flow path of the solution, making the solution more evenly distributed during the pressurizing process, thereby improving the filtration efficiency. The design of the conical grooves 1414 makes the flow rate of the solution slower at the edge and gradually faster in the middle. This change in flow rate helps the precipitation and separation of impurities in the solution, further improving the filtration effect.

[0027] Secondly, through the setting of the reverse osmosis membrane layer 1415, the lower solution chamber can deeply filter the solution. After the solution passes through the filter layer 1412 and the filter chamber, it finally passes through the reverse osmosis membrane layer 1415. This membrane layer can effectively remove tiny impurities and dissolved solids in the solution, ensuring that the solution flowing into the lower solution chamber has higher purity. This multi-layer filtration structure not only improves the filtration effect of the solution, but also extends the service life of the reverse osmosis membrane layer, because the upper filter layer 1412 and pressurizing part 1413 can remove most of the impurities in advance, reducing the burden on the reverse osmosis membrane layer.

[0028] In addition, this structural arrangement of the pressure channel two 214 also enhances the stability and controllability of the entire filtration process. The precise control of the electric push rod one 2142 makes the lifting movement of the pressure filtration element 2141 smoother, thus ensuring the continuity and stability of the filtration process. Finally, the layered structure of the upper and lower solution chambers makes the filtration process more efficient and thorough. Through multi-level filtration and pressurization design, various impurities in the solution can be effectively removed, ensuring the high quality of the final product. This structure not only improves the filtration efficiency but also reduces the difficulty of subsequent processing, provides a purer solution for the subsequent precipitation and crystallization processes, and thus improves the efficiency and product quality of the entire production process.

[0029] Furthermore, a second extraction pump 26 is connected between the overflow communication hole 2121 and the pressure channel two 214 to extract the solution in the first temporary chamber 212 into the pressure channel two 214 through the second extraction pump 26. When the pressure filtration element 2141 rises and covers the port of the overflow communication hole 2121, the second extraction pump 26 stops extracting the solution. When the pressure filtration element 2141 descends, the second extraction pump 26 extracts the solution to the surface of the filter layer 1412. Moreover, a check valve 2111 is provided in the pressure channel one 211. The high-resistance direction of the check valve 2111 is opposite to the flowing direction of the solution in the pressure channel one 211. An inclined surface is arranged at the lower side of the inner end of the pressure channel one 211 near the connection end with the first temporary chamber 212. The inclined surface is arrayed with a plurality of protruding slow-flow convex parts 2114. A filter element 2113 is arranged at the communication end of the pressure channel one 211 with the second temporary chamber 213. A first pressurization part 2112 is also provided in the middle of the pressure channel one 211. A piston block 241 is arranged in the first pressurization part 2112, and the first pressurization part 2112 communicates outward through a hole. The piston block 241 is driven to lift and lower by an electric push rod two 24. When the electric push rod two 24 squeezes the piston block 241 downward, the piston block 241 blocks the port of the hole and pressurizes the solution between the check valve 2111 and the filter element 2113, so that the solution seeps into the first temporary chamber 212 from the filter element 2113. When the piston block 241 rises, the air in the first pressurization part 2112 is discharged outward through the hole.

[0030] This precise pressure control can ensure that the solution uniformly passes through the filter element 2113 under high pressure, improving the filtration efficiency. At the same time, the design of the pressurizing part 2112 makes the pressurizing process smoother, avoiding the influence of pressure fluctuations on the filtration effect. Secondly, the filter element 2113 is arranged at the connecting end of the first pressurizing channel 211 and the second retention chamber 213. When the solution passes through the filter element 2113 under high pressure, it can further remove tiny impurities and suspended substances in the solution. The selective filtration function of the filter element 2113 ensures that only pure solution can flow into the second retention chamber 213, thus improving the purity of the solution. Furthermore, the setting of the one-way valve 2111 ensures that the solution can only flow from the first pressurizing channel 211 to the first retention chamber 212, preventing the solution from flowing back to the acid leaching kettle 1 during the pressurizing process, thereby avoiding the re-mixing of impurities. This one-way flow design guarantees the purity of the solution during the pressurized filtration process and improves the processing efficiency of subsequent processes.

[0031] And as shown in the figure, a regulating valve 25 is provided above the first pressurizing channel 211 and is connected to it. Before the solution enters the first pressurizing channel 211, the regulating valve 25 can be used to control the entry of the solution.

[0032] Moreover, the shape of the conical protrusion 2115 helps to guide the impurities in the solution to converge towards the bottom of the chamber, accelerating the sedimentation process of the impurities. Its inclined surface reduces the adhesion of impurities to the side wall and the bottom plane of the first retention chamber 212, making it easier for the impurities to slide down to the bottom of the chamber, thereby improving the collection efficiency of the impurities. This structural design can also prevent the impurities from forming secondary suspension in the first retention chamber 212, ensuring that the solution is clearer and purer after preliminary precipitation, providing better conditions for subsequent filtration and treatment processes.

[0033] And a through hole 215 is provided in the tank body 21, and a float 2122 is provided in the first retention chamber 212. The float 2122 passes through the through hole 215 from the inside to the outside and extends towards the outside of the tank body 21; The float 2122 includes a fixing block 1221, a floating block 1222 and an air pipe 1223. The fixing block 1221 is fixed at the port of the through hole 215. The floating block 1222 passes through the fixing block 1221, and the floating block 1222 is fixed at the lower end of the air pipe 1223. The air pipe 1223 is a hollow structure, and the lower part of the air pipe 1223 communicates with the outside through a plurality of air holes 2231, enabling air to flow through the air holes 2231 and the inner end of the air pipe 1223; The filling cushion block 1224 consists of an inner ring and an outer ring, and the inner and outer rings are connected and fixed by a plurality of connecting pieces. A flow channel 2241 for gas flow is formed between two adjacent connecting pieces, and ball bearings 2242 are provided on the surface of the inner ring; As can be seen above, the flow channel 2241 provides a smooth flow path for the gas, enabling the gas to efficiently flow from the inner ring to the outer ring, and then enter the trachea 1223 through the air-permeable holes 2231, thereby providing a stable buoyancy force for the floating block 1222 and ensuring the normal operation of the float 2122. Secondly, the multiple flow channels 2241 are evenly distributed, which helps to achieve uniform gas flow, avoid gas concentration in a certain area, thus ensuring uniform force on the floating block 1222 and maintaining the stability and reliability of the float 2122.

[0034] A method of using the device for preparing iron phosphate from waste batteries as described above, the method comprising the following steps: S1: Put the waste batteries to be recycled into the acid leaching kettle 1, add sulfuric acid into the acid leaching kettle 1 through the sulfuric acid pump 12, and add water into the acid leaching kettle 1 through the sulfuric acid pump 12. Soak the waste batteries with sulfuric acid and water to form acid leaching, and leach out the iron and phosphorus elements in the waste batteries. S2: Extract the solution formed after the acid leaching treatment of the waste batteries in the acid leaching kettle 1 into the filtrate impurity removal kettle 2 through the extraction pump one 14, and separate the solution and the tailings in the solution through the filtrate impurity removal kettle 2 to increase the content of iron and phosphorus elements in the solution. S3: Extract the solution in the filtrate impurity removal kettle 2 to the metering valve 31 through the extraction pump three 32, and by adjusting the pH value and temperature, make the iron and phosphorus in the solution exist in the form of iron phosphate mixture. S4: Put the iron phosphate mixture at the metering weighing scale 41, and according to the preset specific weight, put the iron phosphate mixture into the aging crystallization kettle 4, precipitate and crystallize, and scrape off the iron phosphate mixture crystals formed on the inner surface of the aging crystallization kettle 4 through the shear pump arranged in the aging crystallization kettle 4.

[0035] A preferred technical solution, wherein, when separating the solution and the tailings in the solution through the filtrate impurity removal kettle 2, it is necessary to squeeze the solution in the pressure increasing channel one 211 through the electric push rod two 24 and squeeze the solution in the upper solution cavity arranged in the pressure increasing channel two 214 through the pressure increasing filter element 2141 to achieve secondary pressure increasing and impurity removal.

[0036] The above is only a preferred embodiment of the present invention, and thus the scope of implementation of the present invention cannot be limited thereby. That is, equivalent changes and modifications made according to the scope of the present invention patent and the content of the specification should still fall within the scope covered by the present invention.

Claims

1. A device for preparing ferric phosphate using waste batteries, comprising an acid leaching kettle, a filtrate impurity removal kettle, a synthesis kettle, and an aging crystallization kettle connected in sequence, wherein a material lifting pipe, a sulfuric acid pump, and a water supply pump connected to the acid leaching kettle are provided on the side of the acid leaching kettle, the material lifting pipe is connected to the side of the acid leaching kettle, and the sulfuric acid pump and the water supply pump are connected to the upper end of the acid leaching kettle, a quantitative valve is connected to the side of the synthesis kettle, and the quantitative valve is connected to the filtrate impurity removal kettle through an extraction pump three, so that the solution in the filtrate impurity removal kettle is extracted to the quantitative valve through the extraction pump three, and flows into the synthesis kettle for precipitation, a feeding port is provided on the surface of the aging crystallization kettle, and a quantitative weighing scale is provided on the side of the aging crystallization kettle, so that the material on its surface is put into the aging crystallization kettle through the quantitative weighing scale, the filtrate impurity removal kettle comprises a tank body and a pH meter for detecting the pH value in the tank body and a thermometer for detecting the temperature in the tank body, the pH meter and the thermometer are both inserted into the tank body, and it is characterized in that: The tank body is provided with a pressurized channel 1, a temporary retention chamber 1, a temporary retention chamber 2 and a pressurized channel 2, the pressurized channel 1 is connected to the upper end of the temporary retention chamber 1, the pressurized channel 2 is connected to the upper end of the temporary retention chamber 2, the temporary retention chamber 1 is connected to the pressurized channel 2 through an overflow connecting hole provided at its lower end, and the acid leaching kettle is connected to the pressurized channel 1 through a connecting pipe; A pressurized filter is provided in the pressurized channel 2 near the port of the overflow connecting hole. The pressurized filter is driven to rise and fall by an electric push rod. The overflow connecting hole is connected to the upper part of the pressurized channel 2. When the pressurized filter descends, the overflow connecting hole is connected to the pressurized channel 2. When the pressurized filter rises, the pressurized filter covers the port of the overflow connecting hole and squeezes the solution in the pressurized channel 2, so that the solution penetrates through the pressurized filter downward into the temporary retention chamber 2.

2. The device for preparing iron phosphate using waste batteries according to claim 1, characterized in that: The pressurized channel 2 is divided into an upper solution chamber and a lower solution chamber by a pressurized filter element. The pressurized filter element includes an outer shell, a filter layer and a pressurized part arranged in the outer shell. The filter layer is connected to the output shaft of the electric push rod 1. A filter chamber is arranged between the filter layer and the pressurized part. The surface array of the pressurized part has conical grooves that gradually deepen from the edge to the middle. A reverse osmosis membrane layer is arranged at the lower end of all the pressurized parts. The pressurized part covers the surface of the reverse osmosis membrane layer. When the electric push rod 1 drives the pressurized filter element to rise, the covered port squeezes the solution in the upper solution chamber, so that the solution penetrates through the filter layer, the filter chamber and the reverse osmosis membrane layer in turn and then flows into the lower solution chamber.

3. The device for preparing iron phosphate using waste batteries according to claim 2, characterized in that: An extraction pump 2 is connected between the overflow connecting hole and the pressurized channel 2 to extract the solution in the temporary retention chamber 1 into the pressurized channel 2 through the extraction pump 2. When the pressurized filter element rises and covers the port of the overflow connecting hole, the extraction pump 2 stops extracting the solution. When the pressurized filter element descends, the extraction pump 2 extracts the solution to the surface of the filter layer.

4. The device for preparing iron phosphate using waste batteries according to claim 3, characterized in that: A one-way valve is provided in the pressurized channel 1, and the high resistance direction of the one-way valve is opposite to the flow direction of the solution in the pressurized channel 1. A slope is provided at the lower side of the inner end of the pressurized channel 1 near the connection end with the temporary retention chamber 1, and the slope array has a plurality of raised slow-flow protrusions; A filter element is provided at the connecting end between the pressurized channel 1 and the temporary retention chamber 2, and a pressurized part 1 is also provided in the middle of the pressurized channel 1. A piston block is provided in the pressurized part 1, and the pressurized part 1 is connected to the outside through a hole. The piston block is driven to rise and fall by an electric push rod 2. When the electric push rod 2 squeezes the piston block downward, the piston block blocks the hole port and pressurizes the solution between the one-way valve and the filter element, so that the solution penetrates from the filter element into the temporary retention chamber 1. When the piston block rises, the air in the pressurized part 1 is discharged to the outside through the hole.

5. The device for preparing iron phosphate using waste batteries according to claim 1, characterized in that: The tank body is provided with a through hole, and the temporary retention chamber is provided with a float, which passes through the through hole from the inside to the outside and extends to the outside of the tank body; The float comprises a floating block and an air pipe, wherein the fixed block is fixed at the port of the through hole, the floating block passes through the fixed block, and the floating block is fixed at the lower end of the air pipe, the air pipe is a hollow structure, and the lower part of the air pipe is connected to the outside through a plurality of air holes, so that air flows through the air holes and the inner end of the air pipe; The filling pad is composed of an inner ring and an outer ring, which are connected and fixed by a plurality of connecting plates, and a flow channel for gas flow is formed between two adjacent connecting plates, and balls are arranged on the surface of the inner ring.

6. A method for using the device for preparing iron phosphate using waste batteries as claimed in claim 4 or 5, characterized in that: The method of use comprises the following steps: S1: Put the waste batteries to be recycled into an acid leaching kettle, add sulfuric acid into the acid leaching kettle through a sulfuric acid pump, and add water into the acid leaching kettle through a sulfuric acid pump, soak the waste batteries with sulfuric acid and water to form acid leaching, and leach the iron and phosphorus elements in the waste batteries; S2: extracting the solution formed after the acid leaching of the waste batteries in the acid leaching kettle into the filtrate removal kettle through the extraction pump 1, separating the solution and the tailings in the solution through the filtrate removal kettle, and increasing the content of iron and phosphorus elements in the solution; S3: extracting the solution in the filtrate impurity removal kettle to the quantitative valve through the extraction pump 3, and adjusting the pH value and temperature so that the iron and phosphorus in the solution exist in the form of iron phosphate mixture; S4: putting the iron phosphate mixture into a quantitative weighing scale, and according to a preset specific weight, putting the iron phosphate mixture into an aging crystallization kettle to precipitate crystals, and using a shear pump provided in the aging crystallization kettle to scrape off the iron phosphate mixture crystals formed on the inner surface of the aging crystallization kettle.

7. A method for using the device for preparing iron phosphate using waste batteries as claimed in claim 4 or 5, characterized in that: in, When the solution and the tailings in the solution are separated by the filtrate impurity removal kettle, it is necessary to squeeze the solution in the pressurized channel one by the second electric push rod and squeeze the solution in the upper solution cavity set in the pressurized channel two by the pressurized filter element to achieve secondary pressurization impurity removal.

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