CN216377490U - Ferric phosphate washing system - Google Patents
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Abstract
The utility model relates to the technical field of battery materials, in particular to an iron phosphate washing system. An iron phosphate washing system comprises a precipitation reaction unit, a precipitation slurry washing unit, an aging reaction unit and an aging slurry washing unit; the settling slurry washing unit comprises n stages of first washing equipment, each stage of the first washing equipment is respectively provided with a settling slurry inlet, a settling slurry outlet, a first washing liquid inlet and a first washing liquid outlet, and n is not less than 3 and is an integer; the aged slurry washing unit comprises m stages of second washing equipment, each stage of second washing equipment is respectively provided with an aged slurry inlet, an aged slurry outlet, a second washing liquid inlet and a second washing liquid outlet, and m is not less than 3 and is an integer. The washing system can save a large amount of washing water; the prepared iron phosphate is high-purity iron phosphate, and the content of impurity elements is below 20 ppm.
Description
Technical Field
The utility model relates to the technical field of battery materials, in particular to an iron phosphate washing system.
Background
The iron phosphate is one of the main raw materials for preparing the lithium iron phosphate as the cathode material of the lithium battery. The lithium iron phosphate anode material is used as a key material of the lithium ion battery and has the advantages of high safety, low cost, long service life and the like. In the process of preparing the iron phosphate, a large amount of by-products, namely sodium salt, ammonium salt or sulfate, are generated, and the precipitate needs to be washed, filtered, impurity removed and dried to obtain the iron phosphate, so that a large amount of water is needed to be used for washing in the process of producing the iron phosphate, and a large amount of water resources are wasted.
The current iron phosphate washing method mostly adopts countercurrent washing. The washing method in the technology is three-level countercurrent washing, and the washing water is washing water containing phosphoric acid, so that although the washing water consumption can be effectively reduced and the labor intensity of operators can be reduced, the washing water is washed by pure water containing phosphoric acid, the washing water consumption in the washing process can be effectively reduced, the washing efficiency is improved, the phosphorus content in the discharged wastewater is increased, and the treatment difficulty of the washing wastewater is increased. The second prior art discloses a process and a device for washing iron phosphate. In the washing process of the iron phosphate, the washing water is recycled, only the mother liquor and the first washing water are discharged in the process, the washing water can be recycled, and the waste of water resources is reduced, but the discharged mother liquor and the first washing water contain a large amount of phosphate radicals besides a large amount of by-products of sodium salt, ammonium salt or sulfate, so that the waste of phosphorus resources is caused, and the phosphorus treatment pressure of a subsequent water treatment working section is overlarge.
In view of the above, the present invention is particularly proposed.
SUMMERY OF THE UTILITY MODEL
An object of the present invention is to provide an iron phosphate washing system that can save a large amount of washing water; the prepared iron phosphate is high-purity iron phosphate, and the content of impurity elements is below 20 ppm.
In order to achieve the above purpose of the present invention, the following technical solutions are adopted:
an iron phosphate washing system comprises a precipitation reaction unit, a precipitation slurry washing unit, an aging reaction unit and an aging slurry washing unit;
the settling slurry washing unit comprises n stages of first washing equipment, each stage of the first washing equipment is respectively provided with a settling slurry inlet, a settling slurry outlet, a first washing liquid inlet and a first washing liquid outlet, and n is not less than 3 and is an integer; wherein, the precipitation slurry inlet and the first washing liquid outlet of the first washing equipment of the x-th stage are respectively and correspondingly connected with the precipitation slurry outlet and the first washing liquid inlet of the first washing equipment of the (x-1) th stage, the precipitation slurry outlet and the first washing liquid inlet of the first washing equipment of the x-th stage are respectively and correspondingly connected with the precipitation slurry inlet and the first washing liquid outlet of the first washing equipment of the (x +1) th stage, 1< x < n, and x is an integer;
the precipitation reaction unit is provided with a reaction material inlet, a slurry outlet and a precipitation mother liquor outlet; a precipitation slurry inlet of the first-stage first washing equipment is connected with a slurry outlet of the precipitation reaction unit;
the aging reaction unit is provided with a reaction material inlet, a slurry outlet and an aging mother liquor outlet; a precipitation slurry outlet of the nth-stage first washing device is connected with a slurry inlet of the aging reaction unit;
the aged slurry washing unit comprises m stages of second washing equipment, each stage of second washing equipment is respectively provided with an aged slurry inlet, an aged slurry outlet, a second washing liquid inlet and a second washing liquid outlet, and m is not less than 3 and is an integer; wherein, the aged slurry inlet and the first washing liquid outlet of the y-th-stage second washing equipment are respectively and correspondingly connected with the aged slurry outlet and the second washing liquid inlet of the (y-1) -th-stage second washing equipment, the precipitated slurry outlet and the second washing liquid inlet of the y-th-stage second washing equipment are respectively and correspondingly connected with the precipitated slurry inlet and the second washing liquid outlet of the (y +1) -th-stage second washing equipment, 1< y < m, and y is an integer.
Further, n and m are respectively 3-5.
Further, each of the first washing apparatuses comprises a washing device and a filtering device.
Further, each of the second washing apparatuses comprises a washing device and a filtering device.
Further, the precipitation reaction unit is also provided with an aging mother liquor inlet;
the aging mother liquor inlet is connected with the aging mother liquor outlet.
Further, a second washing liquid outlet of the first-stage second washing device is connected with the aged mother liquid inlet.
Further, the iron phosphate washing system also comprises a precipitation mother liquor recovery device;
the precipitation mother liquor outlet is connected with a precipitation mother liquor recovery device.
Further, the iron phosphate washing system also comprises a first washing liquid recovery device;
the first washing liquid recovery device is connected with a first washing liquid outlet of the first-stage first washing equipment.
Further, the precipitation reaction unit comprises a precipitation reaction device and a filtration device.
Further, the aging reaction unit comprises an aging reaction device and a filtering device.
Further, the iron phosphate washing system also comprises an iron phosphate containing device;
the iron phosphate containing device is connected with an aged slurry outlet of the mth second washing equipment.
Compared with the prior art, the utility model has the beneficial effects that:
the iron phosphate washing system can save a large amount of washing water; the prepared iron phosphate is high-purity iron phosphate, and the content of impurity elements is below 20 ppm.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of the ferric phosphate washing system of example 1;
fig. 2 is a flowchart of the iron phosphate washing method of example 2.
Reference numerals:
the device comprises a 1-precipitation reaction unit, a 101-precipitation reaction device, a 102-precipitation reaction slurry filtering device, a 103-reaction material supply device, a 104-precipitation mother liquor recovery device, a 2-precipitation slurry washing unit, a 201-first-stage first washing device, a 202-second-stage first washing device, a 203-third-stage first washing device, a 204-first washing liquid recovery device, a 3-aging reaction unit, a 301-aging reaction device, a 302-aging reaction slurry filtering device, a 4-aging slurry washing unit, a 401-first-stage second washing device, a 402-second-stage second washing device, a 403-third-stage second washing device and a 5-iron phosphate accommodating device.
Detailed Description
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element to which the description refers must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
An iron phosphate washing system comprises a precipitation reaction unit, a precipitation slurry washing unit, an aging reaction unit and an aging slurry washing unit;
the settling slurry washing unit comprises n stages of first washing equipment, each stage of the first washing equipment is respectively provided with a settling slurry inlet, a settling slurry outlet, a first washing liquid inlet and a first washing liquid outlet, and n is not less than 3 and is an integer; wherein, the precipitation slurry inlet and the first washing liquid outlet of the first washing equipment of the x-th stage are respectively and correspondingly connected with the precipitation slurry outlet and the first washing liquid inlet of the first washing equipment of the (x-1) th stage, the precipitation slurry outlet and the first washing liquid inlet of the first washing equipment of the x-th stage are respectively and correspondingly connected with the precipitation slurry inlet and the first washing liquid outlet of the first washing equipment of the (x +1) th stage, 1< x < n, and x is an integer;
the precipitation reaction unit is provided with a reaction material inlet, a slurry outlet and a precipitation mother liquor outlet; a precipitation slurry inlet of the first-stage first washing equipment is connected with a slurry outlet of the precipitation reaction unit;
the aging reaction unit is provided with a reaction material inlet, a slurry outlet and an aging mother liquor outlet; a precipitation slurry outlet of the nth-stage first washing device is connected with a slurry inlet of the aging reaction unit;
the aged slurry washing unit comprises m stages of second washing equipment, each stage of second washing equipment is respectively provided with an aged slurry inlet, an aged slurry outlet, a second washing liquid inlet and a second washing liquid outlet, and m is not less than 3 and is an integer; wherein, the aged slurry inlet and the first washing liquid outlet of the y-th-stage second washing equipment are respectively and correspondingly connected with the aged slurry outlet and the second washing liquid inlet of the (y-1) -th-stage second washing equipment, the precipitated slurry outlet and the second washing liquid inlet of the y-th-stage second washing equipment are respectively and correspondingly connected with the precipitated slurry inlet and the second washing liquid outlet of the (y +1) -th-stage second washing equipment, 1< y < m, and y is an integer.
The system can save a large amount of water for washing; the prepared iron phosphate is high-purity iron phosphate, and the content of impurity elements is below 20 ppm.
Further, n and m are respectively 3-5.
In one implementation, n and m are each specifically 3, 4, or 5.
Further, each of the first washing apparatuses comprises a washing device and a filtering device.
In one embodiment, each first washing device comprises a washing device and a filtering device, and the precipitation slurry enters the washing device for washing and then enters the filtering device for filtering.
Further, each of the second washing apparatuses comprises a washing device and a filtering device.
In one embodiment, each second washing apparatus comprises a washing device and a filtering device, and the aged slurry enters the washing device for washing and then enters the filtering device for filtering.
Further, the precipitation reaction unit is also provided with an aging mother liquor inlet;
the aging mother liquor inlet is connected with the aging mother liquor outlet.
The aging mother liquor inlet is connected with the aging mother liquor outlet through a pipeline.
Further, a second washing liquid outlet of the first-stage second washing device is connected with the aged mother liquid inlet.
Or the second washing liquid outlet of the first-stage second washing device is connected with the pipeline (the pipeline arranged between the aging mother liquid inlet and the aging mother liquid outlet).
The contents of sodium salt, ammonium salt or sulfate in the primary washing filtrate of the aging reaction mother liquor and the aging slurry are relatively low, and a large amount of phosphoric acid in the primary washing filtrate of the aging reaction mother liquor and the aging slurry can be recycled to a precipitation reaction section; the phosphorus resource is fully utilized, the waste of the phosphorus resource is avoided, the raw material cost is saved, and the water treatment pressure is reduced.
Further, the iron phosphate washing system also comprises a precipitation mother liquor recovery device;
the precipitation mother liquor outlet is connected with a precipitation mother liquor recovery device.
In one embodiment, the precipitation mother liquor is sent to a water treatment plant for treatment.
Further, the iron phosphate washing system also comprises a first washing liquid recovery device;
the first washing liquid recovery device is connected with a first washing liquid outlet of the first-stage first washing equipment.
In one embodiment, the first scrubbing liquid of the first stage first scrubbing apparatus is sent to a water treatment plant for treatment.
Further, the precipitation reaction unit comprises a precipitation reaction device and a filtration device.
In one embodiment, the reaction material firstly enters the precipitation reaction device for precipitation reaction, and the precipitation reaction slurry enters the filtering device for filtering.
Further, the aging reaction unit comprises an aging reaction device and a filtering device.
In one embodiment, the nth-stage precipitated slurry enters an aging reaction device to perform an aging reaction with other materials, and the obtained aged slurry further enters a filtering device to perform filtering treatment.
Further, the iron phosphate washing system also comprises an iron phosphate containing device;
the iron phosphate containing device is connected with an aged slurry outlet of the mth second washing equipment.
The iron phosphate containing device is used for containing the obtained iron phosphate product.
The water washing method of the iron phosphate comprises the following steps of:
the preparation process of the ferric phosphate is divided into two processes of precipitation reaction and aging reaction, and the washing process of the ferric phosphate is divided into two washing sections of a precipitation slurry washing section and an aging slurry washing section.
In the precipitation reaction, the raw material iron source: a phosphorus source: the molar ratio of hydrogen peroxide is 2: 2: 1, adjusting the pH value to 2-3 by ammonia water or sodium hydroxide.
The aging reaction is as follows: the precipitate filter cake is used as a raw material, the slurry is carried out until the solid content is 5% -15%, and the pH value is adjusted to 1.7-1.8 by phosphoric acid and phosphate.
In one embodiment, the washing temperature of each stage of washing section is 40-60 ℃. Specifically, 42 ℃, 45 ℃, 50 ℃, 55 ℃, 67 ℃ and the like, and other values within the above range may be selected, and are not limited herein.
In one embodiment, the solids content of the slurry in each stage of the water wash section is between 5% and 20%. Specifically, the content is 7%, 10%, 12%, 15%, 17%, etc., and other values within the above range may be selected, and are not limited herein.
In one embodiment, the precipitate slurry water wash filtrate end point conductivity is less than or equal to 20 mS/cm. Specifically, 5mS/cm, 7mS/cm, 10mS/cm, 13mS/cm, etc., and other values within the above range may be selected, which is not limited herein.
In one embodiment, the end point conductivity of the aged slurry water-washed filtrate is less than or equal to 0.5mS/cm, specifically 0.1mS/cm, 0.2mS/cm, 0.3mS/cm, 0.4mS/cm, and the like, and other values within the above range may be selected, which is not limited herein.
A large amount of sodium salt, ammonium salt or sulfate is removed in the precipitation reaction slurry washing section, so that the contents of sodium salt, ammonium salt or sulfate in the aging reaction mother liquor and the aging slurry primary washing filtrate are relatively low, and simultaneously, a large amount of phosphoric acid in the aging reaction mother liquor and the aging slurry primary washing filtrate can be recycled to the precipitation reaction section; the phosphorus resource is fully utilized, the waste of the phosphorus resource is avoided, the raw material cost is saved, and the water treatment pressure is reduced. Washing the precipitation reaction slurry with water to remove a large amount of sodium salt, ammonium salt or sulfate in the reaction system, so that impurity elements can be obviously prevented from being embedded into crystal lattices in the aging reaction crystal form conversion process, and compared with the one-step method for preparing the iron phosphate, a large amount of washing water can be saved; the prepared iron phosphate is high-purity iron phosphate, and the content of impurity elements is below 20 ppm.
The following examples and comparative examples are further illustrated.
Fig. 1 is a schematic diagram of the ferric phosphate washing system of example 1. Fig. 2 is a flowchart of the iron phosphate washing method of example 2.
Example 1
An iron phosphate washing system comprises a precipitation reaction unit 1, a precipitation slurry washing unit 2, an aging reaction unit 3 and an aging slurry washing unit 4;
the precipitated slurry washing unit 2 comprises three stages of first washing devices, each stage of the first washing devices is provided with a precipitated slurry inlet, a precipitated slurry outlet, a first washing liquid inlet and a first washing liquid outlet, wherein the precipitated slurry inlet and the first washing liquid outlet of the second stage of the first washing devices 202 are respectively and correspondingly connected with the precipitated slurry outlet and the first washing liquid inlet of the first stage of the first washing devices 201, and the precipitated slurry outlet and the first washing liquid inlet of the second stage of the first washing devices 202 are respectively and correspondingly connected with the precipitated slurry inlet and the first washing liquid outlet of the third stage of the first washing devices 203;
the precipitation reaction unit 1 is provided with a reaction material inlet, a slurry outlet and a precipitation mother liquor outlet; a precipitation slurry inlet of the first-stage first washing device 201 is connected with a slurry outlet of the precipitation reaction unit 1;
the aging reaction unit 3 is provided with a reaction material inlet, a slurry outlet and an aging mother liquor outlet; a precipitation slurry outlet of the third-stage first washing device 203 is connected with a slurry inlet of the aging reaction unit 3; the reaction material inlet is connected with a reaction material supply device 103;
the aged slurry washing unit 4 comprises three stages of second washing equipment, and each stage of second washing equipment is respectively provided with an aged slurry inlet, an aged slurry outlet, a second washing liquid inlet and a second washing liquid outlet; wherein, the aged slurry inlet and the first washing liquid outlet of the second-stage second washing device 402 are respectively and correspondingly connected with the aged slurry outlet and the second washing liquid inlet of the first-stage second washing device 401, and the precipitated slurry outlet and the second washing liquid inlet of the second-stage second washing device 402 are respectively and correspondingly connected with the precipitated slurry inlet and the second washing liquid outlet of the third-stage second washing device 403;
each of the first washing apparatuses comprises a first washing device and a first filtering device;
each of the second washing apparatuses comprises a second washing device and a second filtering device;
the precipitation reaction unit 1 is also provided with an aging mother liquor inlet;
the aging mother liquor inlet is connected with the aging mother liquor outlet;
a second washing liquid outlet of the first-stage second washing device 401 is connected with the aging mother liquid inlet;
the iron phosphate washing system also comprises a precipitation mother liquor recovery device 104, and the precipitation mother liquor outlet is connected with the precipitation mother liquor recovery device 104;
the iron phosphate washing system further comprises a first washing liquid recovery device 204, and a first washing liquid outlet of the first-stage first washing equipment 201 is connected with the first washing liquid recovery device 204;
the precipitation reaction unit 1 comprises a precipitation reaction device 101 and a precipitation reaction slurry filtering device 102;
the aging reaction unit 3 comprises an aging reaction device 301 and an aging reaction slurry filtering device 302;
the iron phosphate washing system further comprises an iron phosphate containing device 5, and the iron phosphate containing device 5 is connected with an aged slurry outlet of the third-stage second washing device 403.
Example 2
A method for washing ferric phosphate with water, using the system of embodiment 1, comprising the following steps:
(a) feeding the reaction material into a precipitation reaction device 101 for precipitation reaction, pumping the precipitation reaction slurry into a precipitation reaction slurry filtering device 102 for filtering, wherein the filtrate is precipitation mother liquor, the filter cake is precipitation filter cake, and the precipitation mother liquor is discharged to a water treatment workshop;
(b) taking 1000g of precipitated filter cake, and sequentially treating the precipitated filter cake by first-stage first washing equipment 201, second-stage first washing equipment 202 and third-stage first washing equipment 203; recycling the second-stage washing filtrate of the precipitated slurry to first-stage first washing equipment 201 of the precipitated slurry, and recycling the third-stage washing filtrate of the precipitated slurry to second-stage first washing equipment 202 of the precipitated slurry; the conductivity of the obtained precipitation slurry three-stage washing filtrate is 1.33 mS/cm;
(c) transferring a filter cake at the three-stage washing section of the precipitated slurry to an aging reaction device 301 of an aging reaction unit 3 for aging reaction; pumping the aging reaction slurry into an aging reaction slurry filtering device 302 for filtering, wherein the filtrate is an aging mother liquor, the filter cake is an aging filter cake, and the aging reaction mother liquor is recycled to the precipitation reaction section;
(d) washing the aged filter cake by first-stage second washing equipment 401, second-stage second washing equipment 402 and third-stage second washing equipment 403 in sequence, and recycling the aged slurry first-stage washing filtrate to the precipitation reaction unit 1; recycling the aged slurry secondary washing filtrate to the aged slurry first-stage second washing equipment 401, and recycling the aged slurry tertiary washing filtrate to the aged slurry second-stage second washing equipment 402; the conductivity of the filtrate of the three-stage washing of the aged slurry is 0.451mS/cm, and the filter cake of the three-stage washing section of the aged slurry is the ferric phosphate dihydrate after washing;
according to the washing process, the water washing jacket is used, wherein the solid content of the slurry washed by each stage is 15%, and the temperature of the water washing water is 50 ℃.
Example 3
A method for washing ferric phosphate, except that 1500g of precipitation filter cake is taken, the conductivity of the obtained precipitation slurry three-stage washing filtrate is 1.271mS/cm, the conductivity of the aging slurry three-stage washing filtrate is 0.404mS/cm, and the other conditions are the same as those in the example 2.
Example 4
A method for washing ferric phosphate, except that 2500g of precipitated filter cake is taken to obtain precipitated slurry, the conductivity of the three-stage washing filtrate is 1.399mS/cm, the conductivity of the three-stage washing filtrate of the aged slurry is 0.458mS/cm, and the other conditions are the same as those in the example 2.
Comparative example 1
The iron phosphate washing method comprises the following steps:
(1) taking 1000g of precipitate filter cake, and preparing iron phosphate slurry after one-step reaction;
(2) pumping the iron phosphate slurry into a filtering device for filtering, wherein the filtrate is a mother solution, and the filter cake is an iron phosphate filter cake;
(3) after the ferric phosphate filter cake passes through a primary washing section, a secondary washing section and a tertiary washing section, the conductivity of the ferric phosphate tertiary washing filtrate is 0.438mS/cm, and the ferric phosphate dihydrate after washing is obtained;
(4) recycling the secondary washing filtrate of the iron phosphate slurry to the primary washing working section of the iron phosphate slurry, and recycling the tertiary washing filtrate of the iron phosphate slurry to the secondary washing working section of the iron phosphate slurry;
(5) according to the washing process, the water washing jacket is used, wherein the solid content of the slurry washed by each stage is 15%, and the temperature of the water washing water is 50 ℃;
comparative example 2
A method for washing ferric phosphate, except that 1500g of precipitated filter cake is taken, the conductivity of the filtrate of the tertiary washing of ferric phosphate is 0.412mS/cm, and the other conditions are the same as the comparative example 1.
Comparative example 3
A method for washing ferric phosphate, except that 2000g of precipitated filter cake is taken, the conductivity of the filtrate of the tertiary washing of ferric phosphate is 0.471mS/cm, and the other conditions are the same as the comparative example 1.
Test examples
The water consumption of all the examples and comparative examples is counted, and the index of the anhydrous iron phosphate is detected, and the detection results are shown in the following table 1. The detection method of the iron-phosphorus ratio comprises the following steps: iron to phosphorus ratio iron content/phosphorus content. The iron content test method refers to GB/T30835-2014. The phosphorus content test method refers to the GB/T30835-2014 sulfur content detection method referring to GB/T20123.
TABLE 1 test results
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. An iron phosphate washing system is characterized by comprising a precipitation reaction unit, a precipitation slurry washing unit, an aging reaction unit and an aging slurry washing unit;
the settling slurry washing unit comprises n stages of first washing equipment, each stage of the first washing equipment is respectively provided with a settling slurry inlet, a settling slurry outlet, a first washing liquid inlet and a first washing liquid outlet, and n is not less than 3 and is an integer; wherein, the precipitation slurry inlet and the first washing liquid outlet of the x-th stage first washing equipment are respectively and correspondingly connected with the precipitation slurry outlet and the first washing liquid inlet of the x-1 stage first washing equipment, the precipitation slurry outlet and the first washing liquid inlet of the x-th stage first washing equipment are respectively and correspondingly connected with the precipitation slurry inlet and the first washing liquid outlet of the x +1 stage first washing equipment, 1< x < n, and x is an integer;
the precipitation reaction unit is provided with a reaction material inlet, a slurry outlet and a precipitation mother liquor outlet; a precipitation slurry inlet of the first-stage first washing equipment is connected with a slurry outlet of the precipitation reaction unit;
the aging reaction unit is provided with a reaction material inlet, a slurry outlet and an aging mother liquor outlet; a precipitation slurry outlet of the nth-stage first washing device is connected with a slurry inlet of the aging reaction unit;
the aged slurry washing unit comprises m stages of second washing equipment, each stage of second washing equipment is respectively provided with an aged slurry inlet, an aged slurry outlet, a second washing liquid inlet and a second washing liquid outlet, and m is not less than 3 and is an integer; the aging slurry inlet and the first washing liquid outlet of the y-th-stage second washing equipment are respectively and correspondingly connected with the aging slurry outlet and the second washing liquid inlet of the y-1-th-stage second washing equipment, the precipitation slurry outlet and the second washing liquid inlet of the y-th-stage second washing equipment are respectively and correspondingly connected with the precipitation slurry inlet and the second washing liquid outlet of the y + 1-th-stage second washing equipment, 1< y < m, and y is an integer.
2. The iron phosphate washing system according to claim 1, wherein n and m are each 3-5.
3. The iron phosphate washing system of claim 1, wherein each of the first washing apparatuses comprises a washing device and a filtering device;
each of the second washing apparatuses comprises a washing device and a filtering device.
4. The iron phosphate washing system according to claim 1, wherein the precipitation reaction unit is further provided with an aging mother liquor inlet;
the aging mother liquor inlet is connected with the aging mother liquor outlet.
5. The iron phosphate washing system of claim 4, wherein the second washing liquid outlet of the first stage second washing device is connected to the aging mother liquor inlet.
6. The iron phosphate washing system of claim 1, further comprising a precipitation mother liquor recovery device;
the precipitation mother liquor outlet is connected with a precipitation mother liquor recovery device.
7. The iron phosphate washing system of claim 1, further comprising a first washing liquid recovery device;
the first washing liquid recovery device is connected with a first washing liquid outlet of the first-stage first washing equipment.
8. The iron phosphate washing system of claim 1, wherein the precipitation reaction unit comprises a precipitation reaction device and a filtration device.
9. The iron phosphate washing system of claim 1, wherein the aging reaction unit comprises an aging reaction device and a filtration device.
10. The iron phosphate washing system of claim 1, further comprising an iron phosphate containment device;
the iron phosphate containing device is connected with an aged slurry outlet of the mth second washing equipment.
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