Treatment system for iron phosphate waste filter cake
By designing a waste iron phosphate filter cake treatment system, the waste filter cake is transformed into valuable iron phosphate products through steps such as pulping, filtration, demagnetization, and formation. This solves the problems of resource waste and environmental pollution, and achieves efficient and environmentally friendly resource utilization and product production.
Patent Information
- Application Number
- CN202520166914.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-22
- Publication Date
- 2026-02-24
- Estimated Expiration
- 2035-01-22
AI Technical Summary
The waste filter cake generated during the production of ferric phosphate is directly discarded, resulting in resource waste and environmental pollution. Existing technologies are unable to handle it efficiently and in an environmentally friendly manner.
A waste filter cake treatment system for ferric phosphate was designed, including a first pulping tank, a filter, a demagnetizing reactor, a synthesis kettle, and a formation kettle. Through pulping, filtration, demagnetization, re-pulping, and formation treatment, the waste filter cake is converted into valuable ferric phosphate products.
It improves resource utilization, reduces production costs, avoids environmental pollution, and produces high-quality iron phosphate products to meet market demand.
Smart Images
Figure CN223932256U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of ferric phosphate production, and in particular to a system for treating waste filter cake from ferric phosphate. Background Technology
[0002] As a precursor to lithium iron phosphate (LFP), the cathode material for lithium-ion batteries, the demand for iron phosphate has surged in recent years due to the booming development of the new energy vehicle industry. However, the production process of iron phosphate inevitably generates a certain amount of waste filter cake.
[0003] These filter cakes mainly consist of incompletely reacted raw materials, byproducts, and equipment cleaning fluids, containing a large amount of ferric phosphate and other valuable components. Directly disposing of these waste filter cakes not only wastes resources and increases production costs for enterprises, but may also pollute the environment. Therefore, how to efficiently and environmentally treat waste ferric phosphate filter cakes has become an urgent technical problem to be solved in the ferric phosphate production field.
[0004] Therefore, this application provides a system for treating waste iron phosphate filter cake. Utility Model Content
[0005] To overcome the shortcomings of the prior art, this application provides a treatment system for waste iron phosphate filter cake. The treatment system includes a first pulping tank for pulping the waste iron phosphate filter cake; the first pulping tank is connected to a first filter and then to a demagnetizing reactor; the demagnetizing reactor is connected to a second pulping tank; the second pulping tank is further connected to a synthesis reactor, and the synthesis reactor is then connected to a formation reactor, forming a complete treatment process for waste iron phosphate filter cake. The treatment system solves the problem of resource waste caused by directly scrapping a large amount of waste filter cake.
[0006] The technical solution adopted by this application to solve its technical problem is:
[0007] A system for treating waste iron phosphate filter cake includes a first pulping tank for pulping the waste iron phosphate filter cake.
[0008] The first pulping tank is connected to the first filter; the first filter is connected to the demagnetizing reactor; the demagnetizing reactor is connected to the second pulping tank;
[0009] The second pulping tank is connected to the synthesis vessel, which is connected to the formation vessel.
[0010] In some specific embodiments, the demagnetizing reactor is connected to a second filter, the second filter is connected to a first dryer, the first dryer is connected to a sintering device, and the sintering device is connected to a second slurry tank.
[0011] In some specific embodiments, the second pulping tank is connected to the configuration tank, which is connected to the synthesis vessel.
[0012] In some specific embodiments, the synthesis vessel is connected to a third filter; the third filter is connected to the formation vessel.
[0013] In some specific embodiments, the forming vessel is connected to a fourth filter.
[0014] In some embodiments, the fourth filter is connected to the second dryer.
[0015] In some specific embodiments, the second dryer is connected to a sintering device, which is connected to a pulverizer.
[0016] In some specific embodiments, the feed inlet of the synthesis reactor is connected to a ferrous sulfate tank, a monoammonium phosphate tank, a hydrogen peroxide tank, and an ammonia tank, respectively.
[0017] In some specific embodiments, the feed inlet of the second pulping tank is connected to the acid tank.
[0018] In some specific embodiments, the feed inlet of the reaction vessel is connected to the acid tank.
[0019] The beneficial effects of this application are as follows:
[0020] The processing system described in this application first pulps the waste ferric phosphate filter cake in a first pulping tank, then removes impurities through a first filter, followed by the removal of magnetic substances using a demagnetizing reactor. The treated material is then fed into a second pulping tank for further pulping. Afterward, the material enters a synthesis reactor for a synthesis reaction, and finally undergoes a formation process in a forming reactor. By continuously processing the waste ferric phosphate filter cake through pulping, filtration, demagnetization, further pulping, synthesis, and formation, it is transformed into valuable ferric phosphate products, thereby significantly improving resource utilization and reducing resource waste.
[0021] The processing system described in this application allows enterprises to reduce their reliance on new raw materials and thus lower production costs by recycling waste filter cake. This system effectively solves the problem of treating ferric phosphate waste and avoids environmental pollution caused by direct discharge of waste.
[0022] The processing system described in this application, through a series of meticulous processing steps, is capable of producing high-quality iron phosphate products to meet market demand. Attached Figure Description
[0023] The present application will be further described below with reference to the accompanying drawings and embodiments.
[0024] Figure 1This is a schematic diagram of the structure of a waste filter cake treatment system for ferric phosphate as described in this application;
[0025] Figure 2 This is another structural schematic diagram of a waste filter cake treatment system for iron phosphate as described in this application;
[0026] The components include: 1. First pulping tank; 2. First filter; 3. Demagnetizing reactor; 4. Second pulping tank; 5. Synthesis kettle; 6. Formation kettle; 7. Second filter; 8. Third filter; 9. Fourth filter; 10. First dryer; 11. Second dryer; 12. Sintering equipment; 13. Preparation tank; 14. Crusher; 15. Ferrous sulfate tank; 16. Monoammonium phosphate tank; 17. Hydrogen peroxide tank; 18. Ammonia tank; 19. Acid tank. Detailed Implementation
[0027] The following will clearly and completely describe the concept, specific structure, and resulting technical effects of this application in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of this application. Obviously, the described embodiments are only a part of the embodiments of this application, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are all within the scope of protection of this application. Furthermore, all connections / linkages involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. The various technical features in this application can be combined interactively without contradicting each other.
[0028] Terminology Explanation:
[0029] Drainage material filter cake: This refers to the semi-solid material formed after the waste generated during the production process has undergone preliminary filtration. It usually contains unreacted raw materials and other by-products.
[0030] like Figure 1 As shown, a system for treating waste iron phosphate filter cake includes a first pulping tank 1 for pulping the waste iron phosphate filter cake.
[0031] The first pulping tank 1 is connected to the first filter 2; the first filter 2 is connected to the demagnetizing reactor 3; the demagnetizing reactor 3 is connected to the second pulping tank 4;
[0032] The second pulping tank 4 is connected to the synthesis kettle 5, and the synthesis kettle 5 is connected to the formation kettle 6.
[0033] Specifically, in this application, the first pulping tank is used to pulp the waste iron phosphate filter cake and can receive different batches of ditch material filter cake or synthesize and convert abnormal filter cake materials.
[0034] The first pulping tank converts waste filter cake into slurry through mechanical stirring or hydraulic flushing, which facilitates subsequent processing.
[0035] The first filter uses the retention effect of the filter medium (such as filter screen, filter cloth, etc.) to separate solid particles in the slurry and remove large particulate impurities.
[0036] The demagnetizing reactor removes magnetic impurities from the slurry, preventing these impurities from affecting subsequent processing and ensuring product purity.
[0037] In the second pulping tank, appropriate amounts of water, acid, alkali, and other regulators are added to adjust the pH value, concentration, and other parameters of the pulp, further modifying the pre-treated pulp to meet the requirements of subsequent synthesis reactions.
[0038] The synthesis reactor, under suitable temperature, pressure and reaction conditions, converts phosphate ions, iron ions and other substances in the slurry into ferric phosphate through a chemical reaction, thus achieving the effective recovery and reuse of ferric phosphate in waste filter cake and improving resource utilization.
[0039] The annealing kettle is used to further process the synthesized ferric phosphate to improve its crystallinity and stability.
[0040] More specifically, the first and second pulping tanks can be equipped with appropriate tank equipment. For example, the first and second pulping tanks consist of a tank body, a stirring device, and a motor. The tank body is made of stainless steel, which has good corrosion resistance and can withstand certain pressure and temperature. The stirring device includes stirring blades and a stirring shaft. The stirring blades are designed to be suitable for stirring waste ferric phosphate filter cake, such as anchor type, paddle type, or turbine type, to ensure thorough mixing of the materials. The motor provides power to the stirring device, and its power is selected according to the size of the tank and the material processing capacity.
[0041] The demagnetizing reactor uses common demagnetizing equipment, such as a reaction vessel, magnetic rod assembly, stirring device, motor, inlet and outlet pipes, and valves. The reaction vessel is made of stainless steel and contains multiple layers of magnetic rods made of highly magnetic materials, such as neodymium iron boron, which can generate a strong magnetic field. The stirring device and motor are used to stir the materials, ensuring full contact between the materials and the magnetic field, thus improving the demagnetizing effect.
[0042] The synthesis and processing reactors can be carried out using common reaction vessels.
[0043] Therefore, through the above technical solution, the waste filter cake undergoes pulping in the first pulping tank, followed by filtration to remove large particles of waste. The resulting liquid then enters a demagnetizing reactor for demagnetization to remove magnetic waste. The liquid is then fed into a second pulping tank for pulping. After pulping, it is introduced into a synthesis reactor for synthesis, followed by a formation reaction in a forming reactor to obtain qualified ferric phosphate solution. This solves the problem of resource waste caused by directly discarding waste filter cake and improves resource utilization. By reducing reliance on new raw materials, the company's production costs are lowered, and the pollution caused by direct waste discharge is avoided. Simultaneously, the high-quality ferric phosphate product produced meets market demand, achieving good economic and environmental benefits.
[0044] In one or more embodiments, such as Figure 2 As shown, the demagnetizing reactor 3 is connected to the second filter 7, the second filter 7 is connected to the first dryer 10, the first dryer 10 is connected to the sintering equipment 12; the sintering equipment 12 is connected to the second slurry tank 4.
[0045] Specifically, the feed liquid is sent to the demagnetizing reactor for demagnetization treatment. After the demagnetization treatment is completed, it is introduced into the second filter for filtration. The filter cake is introduced into the dryer for drying treatment. Then it passes through the sintering equipment for sintering treatment to remove organic waste. The sintered material with organic waste removed is introduced into the second pulping tank for pulping treatment.
[0046] More specifically, the feed inlet of the second pulping tank 4 is connected to the acid tank 19. Strong acid is pumped into the second pulping tank through the acid tank for pulping treatment.
[0047] In one or more embodiments, the second pulping tank 4 is connected to the configuration tank 13, which is connected to the synthesis vessel 5.
[0048] The slurry after pulping in the second pulping tank is introduced into the preparation tank for preparation. After preparation, it is introduced into the synthesis reactor for synthesis reaction.
[0049] Specifically, the feed inlet of the synthesis reactor 5 is connected to the ferrous sulfate tank 15, the monoammonium phosphate tank 16, the hydrogen peroxide tank 17, and the ammonia tank 18, respectively.
[0050] In the synthesis reactor, oxidized ferric sulfate and monoammonium phosphate are added, or ferrous sulfate, monoammonium phosphate, and hydrogen peroxide are added, or the pH is adjusted with ammonia water to carry out the synthesis reaction.
[0051] In one or more embodiments, the synthesis vessel 5 is connected to the third filter 8; the third filter 8 is connected to the formation vessel 6.
[0052] Specifically, after the synthesis reaction is completed in the synthesis reactor, the synthesized material is introduced into the third filter for filtration and washing; the washed filter cake is then introduced into the formation reactor for the formation reaction.
[0053] In one or more embodiments, the forming vessel 6 is connected to the fourth filter 9, and the feed inlet of the forming vessel is connected to the acid tank 19.
[0054] Specifically, in the reaction vessel, the acid (phosphoric acid) in the acid tank is introduced into the reaction vessel and the filter cake that has been filtered and washed by the third filter to carry out the reaction. After the reaction is completed, the mixture is introduced into the fourth filter for filtration and washing to obtain the washed filter cake.
[0055] In one or more embodiments, the fourth filter 9 is connected to the second dryer 11, the second dryer 11 is connected to the sintering device 12, and the sintering device 12 is connected to the pulverizer 14.
[0056] Specifically, the filter cake is filtered and washed through the fourth filter to obtain a washed filter cake. The washed filter cake is then introduced into the second dryer for drying, and then successively passed through the sintering equipment and the pulverizer to obtain a qualified iron phosphate product.
[0057] In this application, the sintering equipment can be a sintering furnace, the pulverizer can be a pulverizer; the first filter and the second filter can be a centrifuge or a plate and frame filter press; the first dryer and the second dryer can be an oven or a dryer.
[0058] The working process of a waste filter cake treatment system for ferric phosphate is as follows:
[0059] Pulping process: First, the first pulping tank receives different batches of filter cake from the drainage ditch or abnormal filter cake materials from synthesis and conversion. The waste filter cake is converted into slurry through stirring for subsequent processing.
[0060] Filtration and impurity removal: The slurry in the first pulping tank enters the first filter, and the solid particles in the slurry are separated by the interception effect of the filter medium (such as filter screen, filter cloth, etc.) to remove large particle impurities.
[0061] Demagnetization Operation: The filtrate filtered through the first filter enters the demagnetization reactor. The demagnetization reactor consists of a reaction tank, magnetic rod assembly, stirring device, motor, inlet and outlet pipes, and valves. It contains multiple layers of magnetic rods made of highly magnetic materials (such as neodymium iron boron), capable of generating a strong magnetic field. The stirring device and motor agitate the material, ensuring full contact within the magnetic field, removing magnetic impurities from the slurry, preventing these impurities from affecting subsequent processing, and guaranteeing product purity.
[0062] Secondary pulping: The demagnetized liquid enters the second pulping tank. Appropriate amounts of water, acid, alkali, and other regulators are added to adjust the pH value, concentration, and other parameters of the pulp, further modulating the pre-treated pulp to meet the requirements of subsequent synthesis reactions. Preferably, the liquid treated in the demagnetizing reactor first passes through a second filter, the filter cake enters a first dryer for drying, and then is sintered in a sintering device to remove organic waste before entering the second pulping tank for secondary pulping. The inlet of the second pulping tank can be connected to an acid tank, through which strong acid is injected for pulping treatment.
[0063] Synthesis Reaction: The slurry from the second pulping tank enters the synthesis reactor. The reactor's inlet is connected to a ferrous sulfate tank, a monoammonium phosphate tank, a hydrogen peroxide tank, and an ammonia tank, respectively. Under suitable temperature, pressure, and reaction conditions, phosphate ions and iron ions in the slurry are converted into ferric phosphate through a chemical reaction, achieving effective recovery and reuse of ferric phosphate from the waste filter cake and improving resource utilization. Preferably, the slurry from the second pulping tank first enters a preparation tank for preparation treatment before entering the synthesis reactor for the synthesis reaction. After the synthesis reaction is completed, the material enters a third filter for filtration and washing.
[0064] Formation Process: The filter cake, after being filtered and washed by the third filter, enters the formation reactor. The feed inlet of the formation reactor can be connected to an acid tank to introduce acid (phosphoric acid) into the formation reactor to react with the filter cake and improve the crystallinity and stability of ferric phosphate. After the formation reaction is completed, the material enters the fourth filter for filtration and washing.
[0065] Post-processing stage: After filtration and washing by the fourth filter, the filter cake enters the second dryer for drying, and then passes through the sintering equipment and the pulverizer for pulverization, finally obtaining qualified iron phosphate product.
[0066] The above is a detailed description of the preferred embodiments of this application. However, the invention of this application is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of this application. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.
Claims
1. A system for treating waste iron phosphate filter cake, characterized in that, Includes a first pulping tank (1) for pulping waste iron phosphate filter cake; The first pulping tank (1) is connected to the first filter (2); the first filter (2) is connected to the demagnetizing reactor (3); the demagnetizing reactor (3) is connected to the second pulping tank (4); The second pulping tank (4) is connected to the synthesis vessel (5), which is connected to the formation vessel (6).
2. The processing system according to claim 1, characterized in that, The demagnetizing reactor (3) is connected to the second filter (7), the second filter (7) is connected to the first dryer (10), the first dryer (10) is connected to the sintering equipment (12); the sintering equipment (12) is connected to the second slurry tank (4).
3. The processing system according to claim 1, characterized in that, The second pulping tank (4) is connected to the configuration tank (13), which is connected to the synthesis tank (5).
4. The processing system according to claim 1, characterized in that, The synthesis vessel (5) is connected to the third filter (8); the third filter (8) is connected to the formation vessel (6).
5. The processing system according to claim 1, characterized in that, The forming vessel (6) is connected to the fourth filter (9).
6. The processing system according to claim 5, characterized in that, The fourth filter (9) is connected to the second dryer (11).
7. The processing system according to claim 6, characterized in that, The second dryer (11) is connected to the sintering equipment (12), which is connected to the pulverizer (14).
8. The processing system according to claim 1, characterized in that, The feed inlet of the synthesis reactor (5) is connected to the ferrous sulfate tank (15), the monoammonium phosphate tank (16), the hydrogen peroxide tank (17), and the ammonia tank (18), respectively.
9. The processing system according to claim 1, characterized in that, The feed inlet of the second pulping tank (4) is connected to the acid tank (19).
10. The processing system according to claim 1, characterized in that, The feed inlet of the reaction vessel (6) is connected to the acid tank (19).