A rinsing method and system for iron phosphate

Abstract

The present invention relates to an iron phosphate rinsing technology, and discloses a rinsing method and system for iron phosphate, the method comprising: continuously adding water to the filter cake after solid-liquid separation of the iron phosphate material for a rinse and rinse until the conductivity of the rinsing water solution is within a preset conductivity range; adding pure water to the primary rinse filter cake that has completed the primary rinse and rinse for a secondary beating and rinsing, adding pure water to the secondary rinse filter cake that has completed the secondary beating and rinsing for three times, and obtaining the rinsed iron phosphate; wherein the secondary rinsing mother liquor and the tertiary rinsing mother liquor are used to rinse the next iron phosphate material once. In this application, the iron phosphate material is rinsed by combining continuous water addition rinsing and two beating and rinsing, and the rinsing water of the beating and rinsing is recycled and reused, which not only avoids the problem of excessive water consumption, but also ensures the uniformity of the rinsing of the phosphoric acid material; and the whole process only requires three rinsing stages, which avoids the problem of rinsing taking too long.

Description

Technical Field

[0001] The present invention relates to the technical field of iron phosphate rinsing, and in particular to an iron phosphate rinsing method and system. Background Art

[0002] With the continuous development of the new energy industry, the lithium battery industry is also growing, driving the demand and production of anhydrous iron phosphate, a precursor for the cathode material of lithium iron phosphate batteries, to a continuously increasing degree. Therefore, small-scale production of anhydrous iron phosphate is unable to meet market demand; large-scale production of anhydrous iron phosphate requires filter presses with larger filter chamber volumes. There are various cleaning methods for filter presses. For example, pure water can be continuously fed into the filter press to rinse to the endpoint conductivity. Alternatively, the iron phosphate can be rinsed in multiple stages to the endpoint conductivity and the rinse water can be recycled in stages. However, these two cleaning methods either consume too much rinsing water, take too long to rinse, or unevenly wash the filter cake, resulting in unstable impurities in the iron phosphate. Summary of the Invention

[0003] The object of the present invention is to provide a rinsing method and system for iron phosphate, which can reduce the amount of rinsing water and the rinsing time while ensuring the rinsing effect of iron phosphate.

[0004] In order to solve the above technical problems, the present invention provides a rinsing method for iron phosphate, comprising:

[0005] After solid-liquid separation of the ferric phosphate material, a filter cake is obtained, and the filter cake is continuously rinsed with water until the conductivity of the rinsing water solution is within a preset conductivity range, thereby obtaining a rinsed filter cake;

[0006] adding pure water to the primary rinsed filter cake for secondary beating and rinsing, and performing solid-liquid separation on the iron phosphate suspension after the secondary beating and rinsing to obtain a secondary rinsed filter cake and a secondary rinse mother liquor;

[0007] The secondary rinsed filter cake is added with pure water for three pulping and rinsing, and the iron phosphate suspension that has completed the three pulping and rinsing is subjected to solid-liquid separation to obtain rinsed iron phosphate and three-rinsing mother liquor; wherein the second-rinsing mother liquor and the three-rinsing mother liquor are used to rinse the next iron phosphate material once.

[0008] Optionally, the preset conductivity range is 1.0 ms / cm to 2.0 ms / cm.

[0009] Optionally, the primary rinsed filter cake is added with pure water for secondary beating and rinsing, comprising:

[0010] Adding 1.5x to 2.0x the mass of pure water to the primary rinsed filter cake for secondary beating and rinsing, wherein x is the mass of the primary rinsed filter cake;

[0011] The secondary rinsed filter cake is added with pure water and then subjected to three pulping and rinsing steps, including:

[0012] The secondary rinsed filter cake is added with 1.5y to 2.0y of pure water for the third beating and rinsing, wherein y is the mass of the secondary rinsed filter cake.

[0013] Optionally, the primary rinsed filter cake is added with pure water for secondary beating and rinsing, comprising:

[0014] Adding pure water to the filter cake after primary rinsing and stirring to complete secondary beating and rinsing;

[0015] The secondary rinsed filter cake is added with pure water and then subjected to three pulping and rinsing steps, including:

[0016] The secondary rinsed filter cake is added into pure water and heated and stirred to complete three pulping and rinsing.

[0017] Optionally, the primary rinsed filter cake is added with pure water for secondary beating and rinsing, comprising:

[0018] The filter cake was rinsed with pure water for 5 to 10 minutes to complete the second rinse.

[0019] The secondary rinsed filter cake is added with pure water and then subjected to three pulping and rinsing steps, including:

[0020] The secondary rinsed filter cake is added with pure water and rinsed for 5 to 10 minutes to complete three pulping and rinsing steps.

[0021] A rinsing system for iron phosphate, used for rinsing the iron phosphate as described in any one of the above items, comprising: a filter press, a conveying device, a pulping kettle, and a mother liquor collection tank;

[0022] The filter press is used to perform solid-liquid separation on the ferric phosphate material to obtain a filter cake, and continuously add water to the filter cake to rinse it once until the conductivity of the rinsing water solution is within the set conductivity range to obtain a primary rinse filter cake; perform solid-liquid separation on the ferric phosphate suspension after the secondary beating and rinsing to obtain a secondary rinse filter cake and a secondary rinse mother liquor; perform solid-liquid separation on the ferric phosphate suspension after the tertiary beating and rinsing to obtain rinsed ferric phosphate and a tertiary rinse mother liquor;

[0023] The beating kettle is used to perform a second beating and rinsing on the filter cake after the first rinse with pure water; and is also used to perform a third beating and rinsing on the filter cake after the second rinse with pure water;

[0024] The mother liquor collecting water tank is used to collect the secondary rinsing mother liquor and the tertiary rinsing mother liquor, and transport the secondary rinsing mother liquor and the tertiary rinsing mother liquor to the filter press so as to be used for rinsing the next iron phosphate material.

[0025] The transport device is used to transport the first rinse filter cake from the filter press to the pulping kettle; transport the iron phosphate suspension that has completed the second pulping and rinsing from the pulping kettle to the filter press; transport the second rinse filter cake from the filter press to the pulping kettle; transport the iron phosphate suspension that has completed the third pulping and rinsing from the pulping kettle to the filter press; and transport and output the rinsed iron phosphate.

[0026] Optionally, the beating kettle is connected to a pure water pipe and is provided with a heating device.

[0027] Optionally, the outer surface of the mother liquid collection box is provided with a heat-insulating layer.

[0028] Optionally, an online conductivity meter is provided in the beating kettle.

[0029] The present invention provides a rinsing method and system for iron phosphate, which comprises: performing solid-liquid separation on an iron phosphate material to obtain a filter cake, and continuously adding water to the filter cake for rinsing once until the conductivity of the rinsing water solution is within a preset conductivity range, thereby obtaining a primary rinsed filter cake; adding pure water to the primary rinsed filter cake for secondary pulping and rinsing, and performing solid-liquid separation on the iron phosphate suspension that has completed the secondary pulping and rinsing, thereby obtaining a secondary rinsed filter cake and a secondary rinsed mother liquor; adding pure water to the secondary rinsed filter cake for tertiary pulping and rinsing, and performing solid-liquid separation on the iron phosphate suspension that has completed the tertiary pulping and rinsing, thereby obtaining rinsed iron phosphate and a tertiary rinsed mother liquor; wherein the secondary rinsed mother liquor and the tertiary rinsed mother liquor are used to perform a primary rinse on the next iron phosphate material.

[0030] The present application first rinses the filter cake after solid-liquid separation of the iron phosphate material once by continuously adding water until the conductivity of the rinsing water solution is within the set conductivity range. During the process of rinsing the filter cake of the iron phosphate once, the longer the rinsing time, the more impurities are washed away, the smaller the conductivity of the rinsing water solution, and the more water consumption; accordingly, the conductivity of the rinsing mother liquor of the subsequent secondary beating rinsing and tertiary beating rinsing is also smaller; the present application limits the conductivity of the rinsing water solution within a reasonable set conductivity range during the single rinsing process, on the one hand avoiding excessive water consumption due to excessive rinsing time, and on the other hand On the one hand, it avoids the problem that the primary rinsing time is too short, resulting in excessive conductivity of the rinsing water in the subsequent secondary pulping and tertiary pulping rinses; it can be seen that the conductivity of the rinsing water solution of the primary rinsing is within the preset conductivity range, so that the conductivity of the rinsing mother liquor of the secondary pulping and tertiary pulping rinses is also relatively small, and then during the recycling and reuse process for the next batch of ferric phosphate material, the rinsing effect will not be affected by excessive conductivity; in addition, in the present application, after the iron phosphate filter cake is continuously rinsed with water, two pulping and rinsing are performed, which avoids the problem of uneven rinsing of the iron phosphate.

[0031] To sum up, in this application, the iron phosphate material is rinsed by combining continuous water rinsing and two pulping rinses, and the rinsing water from the pulping rinse is recycled and reused, which not only avoids the problem of excessive water consumption, but also ensures the uniformity of rinsing the phosphoric acid material; and the entire process only requires three rinsing stages, avoiding the problem of rinsing taking too long. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 A schematic flow chart of the iron phosphate rinsing method provided in an embodiment of the present application.

[0034] Figure 2 A schematic diagram of the framework of the iron phosphate rinsing system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0035] Currently, the conventional method for rinsing iron phosphate materials is to continuously add pure water to the iron phosphate material to achieve the rinsing of the iron phosphate material. The advantages of this rinsing method are that the rinsing time is short and the conductivity of the final iron phosphate is well guaranteed not to be too high. The disadvantages are that the iron phosphate is rinsed unevenly and the water consumption is huge.

[0036] To address the above issues, a widely used multi-stage rinsing method is currently used. This involves rinsing the iron phosphate material multiple times and recycling the rinse water from the next stage as the rinse water for the next stage, thereby improving the utilization rate of the rinse water and reducing the amount of water used for rinsing. Furthermore, the rinse water solution is beaten and stirred during each rinsing step to ensure uniform rinsing of the iron phosphate material. However, this rinsing method is time-consuming, and the repeatedly recycled rinse water often has a problem of excessively high conductivity. Consequently, the rinsing effect on the iron phosphate is relatively poor during the rinsing process using the recycled rinse water, which can even further extend the rinsing time.

[0037] To this end, the present application provides a technical solution for rinsing iron phosphate, which can reduce water consumption and shorten rinsing time while ensuring the rinsing effect of iron phosphate.

[0038] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0039] Reference Figure 1 , Figure 1 A schematic flow chart of a method for rinsing iron phosphate provided in an embodiment of the present application. The method may include:

[0040] S11: After solid-liquid separation of the ferric phosphate material, a filter cake is obtained, and the filter cake is continuously rinsed with water until the conductivity of the rinsing water solution is within a preset conductivity range, thereby obtaining a rinsed filter cake.

[0041] The ferric phosphate material is generally in a suspended liquid state. Before washing it, it can be separated into solid and liquid by a filter press to obtain a filter cake of ferric phosphate.

[0042] It is understandable that the so-called flushing and rinsing is to continuously add water to the container where the filter cake is located, which is generally carried out in a filter press, and at the same time the rinsing water in the filter press is discharged.

[0043] Obviously, in the early stage of rinsing, because the filter cake contains relatively more impurities, the impurities dissolved in the rinsing water solution are also relatively more, and the conductivity of the rinsing water solution is also relatively large; and as the rinsing time increases, the impurity content in the filter cake decreases, and accordingly, the conductivity of the rinsing water solution is also relatively small.

[0044] In this embodiment, when the conductivity of the rinsing aqueous solution is within the set conductivity range, the rinsing of the filter cake is stopped and completed.

[0045] Optionally, the preset conductivity range may be 1.0 ms / cm to 2.0 ms / cm. When this range is exceeded, the time and water volume required for each unit decrease in conductivity increase significantly.

[0046] In practical applications, the filter cake of the iron phosphate is rinsed once so that the conductivity of the rinsing water solution is between 1.0 ms / cm and 2.0 ms / cm, which can ensure that the water consumption of the entire rinsing process of the iron phosphate material is minimized; and it can also ensure that the rinsing mother liquor generated during the subsequent rinsing of the iron phosphate material is limited to a relatively small range, which is conducive to the subsequent recycling of the rinsing mother liquor.

[0047] S12: performing solid-liquid separation on the rinse water solution after the primary rinsing to obtain a primary rinse filter cake.

[0048] After solid-liquid separation of the rinsing water solution from the first rinse, the resulting first rinse filter cake is the product of rinsing the iron phosphate material, along with the rinsing water from the first rinse. However, considering that the rinsing water from the first rinse has a relatively high impurity content, reusing it for rinsing the next batch of iron phosphate material would significantly extend the rinsing time and improve the rinsing effect. Therefore, in this embodiment, the rinsing water from the first rinse is directly discarded.

[0049] S13: adding pure water to the primary rinsed filter cake for secondary beating and rinsing, and performing solid-liquid separation on the iron phosphate suspension that has completed the secondary beating and rinsing to obtain a secondary rinsed filter cake and a secondary rinse mother liquor.

[0050] S14: Add pure water to the secondary rinsed filter cake for three pulping and rinsing, and perform solid-liquid separation on the iron phosphate suspension that has completed three pulping and rinsing to obtain rinsed iron phosphate and three-rinsing mother liquor; wherein, the second-rinsing mother liquor and the three-rinsing mother liquor are used to rinse the next iron phosphate material once.

[0051] It can be understood that the so-called beating and rinsing is stirring during the rinsing process. The secondary beating and rinsing and the tertiary beating and rinsing in this embodiment can be carried out in a beating kettle with stirring and beating function.

[0052] Compared with the above-mentioned single flushing and rinsing, the stirring is carried out in the second pulping and rinsing and third pulping and rinsing processes, which obviously allows the first rinse filter cake and the second rinse filter cake to be more fully in contact with the rinsing water, thereby ensuring the uniformity of the rinsing of the iron phosphate filter cake; avoiding the problem of incomplete rinsing of impurities in some parts of the iron phosphate due to only flushing and rinsing.

[0053] During the secondary beating and rinsing, the filter cake after primary rinsing can be added to 1.5x to 2.0x the mass of pure water for secondary beating and rinsing, where x is the mass of the filter cake after primary rinsing. In other words, the mass of the added pure water is 1.5 to 2 times the mass of the filter cake after primary rinsing.

[0054] Accordingly, during the three-beating and rinsing process, the secondary rinsed filter cake can be added to pure water with a mass of 1.5y to 2.0y for three-beating and rinsing, wherein y is the mass of the secondary rinsed filter cake.

[0055] On this basis, in order to further dissolve the impurities on the filter cake in the rinsing water better during the second and third beating and rinsing processes, the first and second rinse filter cakes can be heated and rinsed while being stirred with the corresponding iron phosphate suspension.

[0056] In order to ensure that the impurities in the primary and secondary rinsing filter cakes are fully dissolved in the rinsing water during the secondary and tertiary beating and rinsing processes, the duration of the secondary and tertiary beating and rinsing can be 5 to 10 minutes.

[0057] As mentioned above, after one flushing and rinsing, the content of impurities in the iron phosphate discus is greatly reduced. Therefore, during the second pulping and rinsing and the third pulping and rinsing processes, the rinsing mother liquor, that is, the impurities dissolved in the rinsing water, are relatively small. For this reason, in this embodiment, the rinsing mother liquor generated by the second pulping and rinsing and the rinsing mother liquor generated by the third pulping and rinsing are both recovered and used in the rinsing water for the first flushing and rinsing of the next batch of iron phosphate materials, thereby avoiding the problem of poor rinsing effect and long rinsing time due to the excessive conductivity of the recovered rinsing mother liquor.

[0058] Based on the above discussion, in the process of rinsing the iron phosphate in this embodiment, a total of three rinses are performed, the first rinse is a flushing rinse, and the second and third rinses are graded pulping rinses; it can be seen that the rinsing of the iron phosphate material in this application is a rinsing method that combines flushing and graded pulping. Compared with the current method of completely adopting flushing and rinsing, the flushing time in this application is greatly reduced, thereby greatly reducing the water consumption, and pulping and rinsing are also performed after flushing and rinsing, thereby ensuring the uniformity of the rinsing of the iron phosphate; on this basis, because flushing and rinsing remove a large amount of impurities in the iron phosphate material, the graded pulping and rinsing only needs two rinses, which greatly reduces the number of rinsing times of the graded pulping and rinsing, and because the impurity content in the filter cake of the graded pulping and rinsing is relatively small, the rinsing mother liquor recovered from the graded pulping and rinsing can be re-invested in the flushing and rinsing of the next batch of iron phosphate materials, and the rinsing effect can be better guaranteed.

[0059] Under normal circumstances, the secondary rinsing mother liquor and tertiary rinsing mother liquor obtained from the secondary beating and rinsing and tertiary beating and rinsing of the previous batch of iron phosphate materials are completely sufficient for one flushing and rinsing of the next batch of iron phosphate materials; it can be seen that in this application, each time a batch of iron phosphate materials is cleaned, only the total amount of pure water required for the secondary beating and rinsing and the tertiary beating and rinsing is required.

[0060] To sum up, the present application first rinses the iron phosphate material once by continuously adding water until the conductivity of the rinsing water solution is within the set conductivity range; after the iron phosphate material is continuously rinsed with water, two pulping and rinsing are performed to avoid the problem of uneven rinsing of the iron phosphate material; the present application adopts a combination of continuous water rinsing and two pulping and rinsing to rinse the iron phosphate material, and limits the conductivity of the rinsing water solution to a reasonable set conductivity range during the single rinsing process, which can not only avoid a single rinsing time being too long and excessive water consumption, but also ensure that the conductivity of the rinsing mother liquor of the second pulping and tertiary pulping is relatively small, and then in the process of being recycled and reused and rinsing the next batch of materials, the rinsing effect will not be affected by excessive conductivity; it can be seen that the method of rinsing iron phosphate in the present application has the advantages of low water consumption and good rinsing effect.

[0061] Based on the above discussion, refer to Figure 2 , Figure 2 This is a schematic diagram of the framework of the iron phosphate rinsing system provided in an embodiment of the present application. The present application further provides an iron phosphate rinsing system for implementing the above-mentioned iron phosphate rinsing method.

[0062] The rinsing system of the iron phosphate comprises: a filter press 1, a conveying device 3, a beating kettle 2, and a mother liquor collecting water tank 4;

[0063] Among them, the filter press 1 is used to perform solid-liquid separation on the iron phosphate material to obtain a filter cake, and continuously add water to the filter cake to rinse it once until the conductivity of the rinsing water solution is within the set conductivity range to obtain a primary rinse filter cake; perform solid-liquid separation on the iron phosphate suspension after the secondary beating and rinsing to obtain a secondary rinse filter cake and a secondary rinse mother liquor; perform solid-liquid separation on the iron phosphate suspension after the tertiary beating and rinsing to obtain rinsed iron phosphate and a tertiary rinse mother liquor;

[0064] The beating kettle 2 is used to perform a second beating and rinsing on the filter cake after the first rinse with pure water; and is also used to perform a third beating and rinsing on the filter cake after the second rinse with pure water;

[0065] The mother liquor collecting water tank 4 is used to collect the secondary rinsing mother liquor and the tertiary rinsing mother liquor, and transport the secondary rinsing mother liquor and the tertiary rinsing mother liquor to the filter press 1 so as to be used for rinsing the next iron phosphate material;

[0066] The conveying device 3 is used to convey the once rinsed filter cake from the filter press 1 to the pulping kettle 2; to convey the iron phosphate suspension that has completed the second pulping and rinsing from the pulping kettle 2 to the filter press 1; to convey the second rinsed filter cake from the filter press 1 to the pulping kettle 2; to convey the iron phosphate suspension that has completed the third pulping and rinsing from the pulping kettle 2 to the filter press 1; and to convey and output the rinsed iron phosphate.

[0067] Optionally, the beating kettle 2 is connected to a pure water pipe so that pure water can be introduced into the beating kettle 2, and a heating device is provided so as to heat the filter cake when rinsing.

[0068] Optionally, the outer surface of the mother liquor collection box 4 is provided with an insulation layer; the mother liquor collection box 4 stores the secondary rinsing mother liquor and the tertiary rinsing mother liquor, and the iron phosphate suspension will be heated during the secondary rinsing and tertiary rinsing processes; for this reason, the temperature of the secondary rinsing mother liquor and the tertiary rinsing mother liquor is also relatively higher, and an insulation layer is provided on the outer surface of the mother liquor collection box 4 to insulate the collected aqueous solution, which is beneficial to improving the subsequent cleaning effect of cleaning the iron phosphate using the rinsing mother liquor in the insulation state.

[0069] Optionally, an online conductivity meter is provided in the beating kettle 2 to monitor the conductivity in the beating kettle 2 in real time.

[0070] Reference Figure 2 , Figure 2 The sequence of transferring materials and rinsing water between the filter press 1, the pulping kettle 2 and the mother liquor collecting box 4 is shown in FIG. In a specific embodiment of the present application, the process of implementing the above-mentioned rinsing method of iron phosphate using the above-mentioned rinsing system of iron phosphate may include:

[0071] 1) Adding the iron phosphate material into the filter press 1 for solid-liquid separation to obtain a filter cake; continuously adding water to the filter cake for rinsing once, so that the conductivity of the rinsing water solution is washed at 1.0-2.0 ms / cm, and the rinsing is completed.

[0072] 2) The filter press 1 performs solid-liquid separation on the phosphoric acid suspension after the primary flushing and rinsing to obtain a primary rinse filter cake and a primary rinse mother liquor; the primary rinse mother liquor can be directly discarded.

[0073] 3) When the primary flushing and rinsing is completed, the filter press 1 starts to discharge the primary rinsed filter cake, and the conveying device 3 conveys the primary rinsed filter cake to the beating kettle 2, that is, Figure 2 The transmission process of winning bid number ①.

[0074] The transport device 3 can be a conveyor belt or other equipment, which can transport materials back and forth between the filter press 1 and the pulping kettle 2.

[0075] 4) Pure water with a mass of 1.5 to 2.0 times the weight of the first rinsed filter cake is added to the beating kettle 2; while beating and stirring the first rinsed filter cake, the heating device of the beating kettle 2 can be turned on to heat the material, which is beneficial to the dissolution of some soluble impurities in the material; after the beating kettle 2 completes the feeding, it beats and rinses for 5 to 10 minutes to complete the second beating and rinsing.

[0076] 5) After the secondary beating and rinsing is completed, the conveying device 3 conveys the secondary beating and rinsing iron phosphate suspension into the filter press 1, that is, Figure 2 The transmission process of winning bid number ②.

[0077] 6) The filter press 1 performs solid-liquid separation on the mixed aqueous solution of the secondary beating and rinsing, and collects the secondary rinsing mother liquor and the secondary rinsing filter cake. The secondary rinsing mother liquor is transported to the mother liquor collection tank 4, and the secondary rinsing filter cake is transported to the beating kettle 2; that is, Figure 2 The transmission process of winning bid number ③.

[0078] 7) The pure water pipe and heating device in the beating kettle 2 are started again. The amount of pure water added is 1.5 to 2.0 times the weight of the secondary rinsed filter cake. After the beating kettle 2 completes the feeding, the secondary rinsed filter cake is continuously beating and rinsing for 5 to 10 minutes, which means the third beating and rinsing can be completed.

[0079] 8) The beating kettle 2 completes the three beating and rinsing, and the conveying device 3 conveys the three-beating and rinsing iron phosphate suspension to the filter press 1, that is, Figure 2 The transmission process of winning bid number ④.

[0080] 9) The filter press 1 performs solid-liquid separation on the mixed aqueous solution, and collects the tertiary rinsing mother liquor and the rinsed iron phosphate; the tertiary rinsing mother liquor is stored in the mother liquor collection tank 4, i.e. Figure 2 The medium filter press 1 points to the transfer process marked ⑤ of the mother liquid collection box 4, and at the same time, the stirring device in the mother liquid collection box 4 is turned on, and the liquid in the mother liquid collection box 4 is recorded by an online conductivity meter; at the same time, the filter press 1 discharges the rinsed iron phosphate, and the conveying device 3 conveys the rinsed iron phosphate to the next process.

[0081] 10) The water in the mother liquor collection tank 4 can re-enter the filter press 1 to carry out a flushing and rinsing process for the next batch of iron phosphate materials, that is, Figure 2 The transmission process of winning bid number ⑥.

[0082] Based on the above discussion, it can be seen that the rinsing system of iron phosphate provided in this application only uses a few simple devices such as a pulping kettle 2, a filter press 1, a mother liquor collection box 4 and a conveying device 3 to realize the entire rinsing process of iron phosphate. The equipment structure is relatively simple, and there is no need for overly complicated graded rinsing equipment, which also reduces the rinsing cost to a certain extent.

[0083] In addition, in an optional embodiment of the present application, the beating kettle 3 completes two beating and rinsing processes in total. In actual applications, two beating kettles 3 can also be configured, and each beating kettle 3 completes one beating and rinsing process respectively, which can ultimately realize the implementation plan of the present application.

[0084] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device comprising a series of elements are inherent to the elements. In the absence of further restrictions, the elements limited by the statement "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device comprising the elements. In addition, the above-mentioned technical solutions provided in the embodiments of the present application are not described in detail in accordance with the corresponding technical solutions in the prior art to achieve the same principle, so as to avoid excessive elaboration.

[0085] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A rinsing method for iron phosphate, characterized in that: include: After solid-liquid separation of the ferric phosphate material, a filter cake is obtained, and the filter cake is continuously rinsed with water until the conductivity of the rinsing water solution is within a preset conductivity range, thereby obtaining a rinsed filter cake; adding pure water to the primary rinsed filter cake for secondary beating and rinsing, and performing solid-liquid separation on the iron phosphate suspension after the secondary beating and rinsing to obtain a secondary rinsed filter cake and a secondary rinse mother liquor; The secondary rinsed filter cake is added with pure water for three beating and rinsing, and the iron phosphate suspension that has completed the three beating and rinsing is subjected to solid-liquid separation to obtain rinsed iron phosphate and three-rinsing mother liquor; wherein the second-rinsing mother liquor and the three-rinsing mother liquor are used to rinse the next iron phosphate material once; The preset conductivity range is 1.0ms / cm~2.0ms / cm; The primary rinsed filter cake is added with pure water for secondary beating and rinsing, comprising: Adding pure water to the filter cake after primary rinsing and stirring to complete secondary beating and rinsing; The secondary rinsed filter cake is added with pure water and then subjected to three pulping and rinsing steps, including: The secondary rinsed filter cake is added into pure water and heated and stirred to complete three pulping and rinsing.

2. The rinsing method of iron phosphate according to claim 1, wherein: The primary rinsed filter cake is added with pure water for secondary beating and rinsing, comprising: Adding 1.5x to 2.0x the mass of pure water to the primary rinsed filter cake for secondary beating and rinsing, wherein x is the mass of the primary rinsed filter cake; The secondary rinsed filter cake is added with pure water and then subjected to three pulping and rinsing steps, including: The secondary rinsed filter cake is added with 1.5y~2.0y of pure water for the three beating and rinsing, wherein y is the mass of the secondary rinsed filter cake.

3. The rinsing method of iron phosphate according to claim 1, wherein: The primary rinsed filter cake is added with pure water for secondary beating and rinsing, comprising: The filter cake was rinsed with pure water for 5 to 10 minutes to complete the second rinse. The secondary rinsed filter cake is added with pure water and then subjected to three pulping and rinsing steps, including: The secondary rinsed filter cake is added with pure water and rinsed for 5 to 10 minutes to complete three pulping and rinsing steps.

4. A rinsing system for iron phosphate, characterized in that: The rinsing method for ferric phosphate according to any one of claims 1 to 3 comprises: a filter press, a conveying device, a pulping kettle, and a mother liquor collection tank; The filter press is used to perform solid-liquid separation on the ferric phosphate material to obtain a filter cake, and continuously add water to the filter cake to rinse it once until the conductivity of the rinsing water solution is within a preset conductivity range to obtain a primary rinse filter cake; perform solid-liquid separation on the ferric phosphate suspension after the secondary beating and rinsing to obtain a secondary rinse filter cake and a secondary rinse mother liquor; perform solid-liquid separation on the ferric phosphate suspension after the tertiary beating and rinsing to obtain rinsed ferric phosphate and a tertiary rinse mother liquor; The beating kettle is used to perform a second beating and rinsing on the filter cake after the first rinse with pure water; and is also used to perform a third beating and rinsing on the filter cake after the second rinse with pure water; The mother liquor collecting water tank is used to collect the secondary rinsing mother liquor and the tertiary rinsing mother liquor, and transport the secondary rinsing mother liquor and the tertiary rinsing mother liquor to the filter press so as to be used for rinsing the next iron phosphate material; The transport device is used to transport the first rinse filter cake from the filter press to the pulping kettle; transport the iron phosphate suspension that has completed the second pulping and rinsing from the pulping kettle to the filter press; transport the second rinse filter cake from the filter press to the pulping kettle; transport the iron phosphate suspension that has completed the third pulping and rinsing from the pulping kettle to the filter press; and transport and output the rinsed iron phosphate.

5. The rinsing system for iron phosphate according to claim 4, characterized in that: The beating kettle is connected to a pure water pipe and is provided with a heating device.

6. The rinsing system for iron phosphate according to claim 5, characterized in that: The outer surface of the mother liquid collection water tank is provided with a heat-insulating layer.

7. The rinsing system for iron phosphate according to claim 4, characterized in that: An online conductivity meter is provided in the beating kettle.

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