A device and method for improving the efficiency of material washing

Abstract

This invention discloses a device for improving material washing efficiency, comprising a reaction vessel, an aging tank, a washing machine, a batching tank, a mother liquor tank, a washing water tank, and an automatic control system. The reaction vessel, aging tank, and washing machine are connected by pipelines. The washing machine is connected to the batching tank, and the washing machine is connected to the mother liquor tank and washing water tank by pipelines equipped with timers. The washing machine is equipped with an alarm, and both the timer and the alarm are electrically connected to the automatic control system. The method for improving efficiency using this device includes the following steps: the slurry in the reaction vessel is filtered, aged, and then filtered again before entering the washing machine; the mother liquor and washing water in the washing machine are discharged into the mother liquor tank and washing water tank, respectively. If the discharge time of the mother liquor and the discharge time of the washing water are within the predetermined time range of the automatic control system, the alarm does not sound; otherwise, an alarm sounds. If the alarm sounds, maintenance is performed; otherwise, the next round of material washing begins. This invention can improve the yield of finished materials and the efficiency of washing production.

Description

Technical Field

[0001] This invention belongs to the field of material washing technology, and specifically relates to a device and method for improving material washing efficiency. Background Technology

[0002] With increased government support for new energy vehicles, the development of upstream and downstream industries has been spurred, leading to a continuous increase in demand for power batteries. Ternary lithium batteries, due to their advantages such as smaller size, higher energy density, low-temperature resistance, and better cycle performance, have become the mainstream battery for new energy passenger vehicles. The performance of the cathode material precursor directly affects various properties of the cathode material, thus determining the core electrochemical performance of lithium batteries, such as rate performance, energy density, and cycle life.

[0003] The precursor for cathode materials is generally obtained using a co-precipitation method. The main process flow is: preparation of ternary solution - reaction - washing - drying - calcination. Currently, there are two main washing methods: one involves washing in a filter press and then discharging into a slurry tank, where it is slurried before proceeding to the next process; the other involves washing using a two-in-one washing machine. This method, compared to the "filter press-slurry" method, integrates washing and slurry processing, saving slurry processing and discharge time, and also reducing equipment investment and land area. However, both washing methods have been found to suffer from significant reductions in washing efficiency and yield due to material leakage and delayed detection. Material leakage mainly occurs when the slurry discharged from the reaction process contains large particles or other sharp-surfaced impurities that tear the filter cloth during repeated washing. During the discharge of the washing liquid, some slurry is discharged into the waste collection tank through the damaged areas. Currently, there are two main solutions to this problem: one is for operators to determine if there is leakage by observing the turbidity of the washing liquid in the washing sight glass during the draining process; the other is for operators to infer leakage based on the total amount of waste material drained when a certain amount of washing waste liquid has been discharged. With the expansion of industrial production scale and the significant increase in washing equipment, manual observation is clearly insufficient. Furthermore, the collected data typically represents the total amount of washing from multiple machines, and checking each machine individually when anomalies are detected requires substantial time and labor costs, resulting in significant delays, material losses, and reduced washing efficiency. Summary of the Invention

[0004] In view of the problems in the prior art, the present invention provides an apparatus and method for improving the efficiency of material washing, which can improve the yield of finished materials and the efficiency of washing production.

[0005] The present invention adopts the following technical solution:

[0006] An apparatus for improving material washing efficiency includes a reactor (1), an aging tank (2), a washing machine (3), a batching tank (4), a mother liquor tank (5), a washing water tank (6), and an automatic control system. The reactor (1) and the aging tank (2) are connected by a pipe with a first filter (8). The aging tank (2) and the washing machine (3) are connected by a pipe with a second filter (10). The washing machine (3) and the batching tank (4) are connected by a discharge pipe. The washing machine (3) and the mother liquor tank (5) are connected by a mother liquor discharge pipe with a first timer (14). The washing machine (3) and the washing water tank (6) are connected by a washing water discharge pipe with a second timer (15). The washing machine (3) is equipped with an alarm (16). The first timer (14), the second timer (15), and the alarm (16) are all electrically connected to the automatic control system.

[0007] Furthermore, both the first filter (8) and the second filter (10) are bag filters.

[0008] Furthermore, the washing machine (3) is a washing and pulping combined washing machine; the washing machine (3) is equipped with a stirring mechanism, and the washing machine (3) is connected to a container containing compressed gas through a pipe equipped with an air inlet valve.

[0009] Furthermore, a mechanical pump and a first valve (7) are installed on the pipeline connecting the reactor (1) and the aging tank (2), and the first valve (7) is located between the reactor (1) and the first filter (8).

[0010] Furthermore, a mechanical pump and a second valve (9) are installed on the pipe connecting the aging tank (2) and the washing machine (3), the second valve (9) being located between the aging tank (2) and the second filter (10).

[0011] Furthermore, a mechanical pump and a third valve (11) are installed on the discharge pipe, a mechanical pump and a fourth valve (12) are installed on the mother liquor discharge pipe, and a mechanical pump and a fifth valve (13) are installed on the wash water discharge pipe.

[0012] Furthermore, the automatic control system includes a pressure sensor unit and a PLC control unit. The first timer (14) and the second timer (15) are electrically connected to the pressure sensor unit. The pressure sensor unit is used to collect water pressure signals and convert them into electrical signals. The PLC control unit is electrically connected to the alarm (16). The PLC control unit is used to determine the time conditions and output electrical signal commands to the alarm (16).

[0013] A method for improving the efficiency of material washing based on the above-described apparatus, the method comprising the following steps:

[0014] Step (1): Open the first valve (7), and the slurry in the reactor is filtered by the first filter (8) and discharged into the aging tank (2). Then close the first valve (7).

[0015] Step (2): After the slurry in the aging tank (2) is aged, aged slurry is obtained; open the second valve (9), close the third valve (11), the fourth valve (12), and the fifth valve (13), and the aged slurry enters the washing machine (3) after being filtered by the second filter (10); close the second valve (9);

[0016] Step (3): Set the predetermined time range for discharging mother liquor and the predetermined time range for discharging wash water in the automatic control system;

[0017] Step (4): After the stirring mechanism of the washing machine (3) is turned on, the air inlet valve, the fourth valve (12) and the first timer (14) are turned on. After the mother liquor in the washing machine (3) is discharged into the mother liquor tank (5), the air inlet valve, the fourth valve (12) and the first timer (14) are turned off. The mother liquor discharge time is fed back to the automatic control system.

[0018] Step (5): Wash the material after the mother liquor is discharged from the washing machine (3), then open the fifth valve (13) and the second timer (15). After the washing water in the washing machine (3) is discharged into the washing water tank (6), close the fifth valve (13) and the second timer (15). The time for discharging the washing water is fed back to the automatic control system.

[0019] Step (6): If the mother liquor discharge time is within the predetermined mother liquor discharge time range and the wash water discharge time is within the predetermined wash water discharge time range, the alarm (16) will not sound an alarm; otherwise, the alarm (16) will sound an alarm.

[0020] Step (7): Open the third valve (11) to discharge the material after washing water from the washing machine (3) into the batch tank (4). If the alarm (16) sounds, the first filter (8), the second filter (10), and the filter screen of the washing machine (3) are inspected. If the alarm (16) does not sound, the next round of material washing begins.

[0021] Further, in step (i), the slurry in the reactor is filtered by the first filter (8) and discharged into the aging tank (2). When the volume of the slurry reaches 3 / 5-4 / 5 of the volume of the aging tank (2), the first valve (7) is closed. In step (ii), the slurry in the aging tank (2) is aged for 1.5h-2h to obtain aged slurry. In step (ii), the aged slurry is filtered by the second filter (10) and enters the washing machine (3). When the volume of the aged slurry reaches 3 / 4-4 / 5 of the volume of the washing machine (3), the second valve (9) is closed.

[0022] Furthermore, in step (iii), the predetermined time range for draining the mother liquor is 60min-70min, and the predetermined time range for draining the washing water is 60min-70min; in step (v), dilute alkali and hot water are added to the washing machine (3) to wash the material after the mother liquor is drained from the washing machine (3), and the washing time is 45min-60min.

[0023] The beneficial technical effects of this invention are as follows: In the washing process of the co-precipitation method for producing cathode material precursors, larger particles or other sharp-surfaced impurities in the reaction slurry may tear the filter cloth during repeated washing without timely detection or with delayed detection. This results in some slurry being discharged with the washing liquid from the damaged filter cloth, causing material loss, affecting washing efficiency, and reducing the yield. Furthermore, with the expansion of production scale and the significant increase in washing equipment, manually observing the washing sight glass to check for equipment leaks requires greater time and labor costs, resulting in a serious lag problem and further reducing production efficiency.

[0024] This invention controls the process from the incoming material stage: filters are installed at the discharge ports of the reactor and aging tank to intercept large particles and impurities in the slurry. Acid is periodically introduced to dissolve impurities and clean the filter screens. The invention also incorporates a timed alarm system. The central control room sets a range for the discharge time based on different washing processes. A timer is installed at the discharge port of the washing machine to monitor the discharge time of the washing liquid. The discharge time is automatically fed back to the central control room, and the system judges the actual discharge time. If the time exceeds the preset range, an alarm sounds. After the machine has finished discharging and cleaning, the filter cloth is inspected and repaired. This invention, by installing filters at the reactor discharge end, controls the entry of large particles and impurities into the washing process from the incoming material stage, greatly reducing the risk of filter cloth damage in the washing equipment. The timed alarm system provides real-time feedback on the waste liquid discharge time of the washing equipment, allowing for timely detection of material leakage. This enables inspection and repair of the equipment in the shortest possible time, significantly reducing material loss and improving the yield and efficiency of the washing production. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the device of the present invention. Detailed Implementation

[0026] See Figure 1The present invention discloses an apparatus for improving material washing efficiency, comprising a reaction vessel 1, an aging tank 2, a washing machine 3, a batching tank 4, a mother liquor tank 5, a washing water tank 6, and an automatic control system. The reaction vessel 1 and the aging tank 2 are connected by a pipe equipped with a first filter 8. The aging tank 2 and the washing machine 3 are connected by a pipe equipped with a second filter 10. The washing machine 3 and the batching tank 4 are connected by a discharge pipe. The washing machine 3 and the mother liquor tank 5 are connected by a mother liquor discharge pipe equipped with a first timer 14. The washing machine 3 and the washing water tank 6 are connected by a washing water discharge pipe equipped with a second timer 15. The washing machine 3 is equipped with an alarm 16. The first timer 14, the second timer 15, and the alarm 16 are all electrically connected to the automatic control system.

[0027] Both the first filter 8 and the second filter 10 are bag filters. The washing machine 3 is a combined washing and pulping machine; the washing machine 3 is equipped with a stirring mechanism, and the washing machine 3 is connected to a container containing compressed gas through a pipe equipped with an air inlet valve. A mechanical pump and a first valve 7 are installed on the pipe connecting the reaction vessel 1 and the aging tank 2, with the first valve 7 located between the reaction vessel 1 and the first filter 8. A mechanical pump and a second valve 9 are installed on the pipe connecting the aging tank 2 and the washing machine 3, with the second valve 9 located between the aging tank 2 and the second filter 10. A mechanical pump and a third valve 11 are installed on the discharge pipe, a mechanical pump and a fourth valve 12 are installed on the mother liquor discharge pipe, and a mechanical pump and a fifth valve 13 are installed on the wash water discharge pipe.

[0028] The automatic control system includes a pressure sensor unit and a PLC control unit. The first timer 14 and the second timer 15 are electrically connected to the pressure sensor unit. The pressure sensor unit is used to collect water pressure signals and convert them into electrical signals. The PLC control unit is electrically connected to the alarm 16. The PLC control unit is used to determine the time conditions and output electrical signal commands to the alarm 16.

[0029] The method for improving material washing efficiency based on the present invention includes the following steps:

[0030] Step (1): Incoming material filtration: Open the first valve 7, and the slurry in the reactor is filtered through the first filter 8 and discharged into the aging tank 2. Then close the first valve 7. Preferably, the first valve 7 is closed when the slurry volume reaches 3 / 5-4 / 5 of the volume of the aging tank 2. Further, the first valve 7 is closed when the slurry volume reaches 3 / 5, 2 / 3, 11 / 15, and 4 / 5 of the volume of the aging tank 2.

[0031] Step (II): After aging, the slurry in aging tank 2 is aged to obtain aged slurry; open the second valve 9, and close the third valve 11, the fourth valve 12, and the fifth valve 13. The aged slurry is filtered by the second filter 10 and then enters the washing machine 3. Close the second valve 9. Preferably, the second valve 9 is closed when the volume of the aged slurry reaches 3 / 4-4 / 5 of the volume of the washing machine 3. Preferably, the slurry in aging tank 2 is aged for 1.5h-2h to obtain aged slurry. Further, the aging time is 1.5h, 1.6h, 1.7h, 1.8h, 1.9h, or 2h, mainly depending on the D50 particle size results of each type of slurry.

[0032] Step (3): Time setting: Set the predetermined time range T1 for discharging mother liquor and the predetermined time range T2 for discharging washing water in the automatic control system in the central control room; the predetermined time range T1 for discharging mother liquor is 60min-70min, and the predetermined time range T2 for discharging washing water is 60min-70min.

[0033] Step (4): Discharge mother liquor: Turn on the stirring mechanism of the washing machine 3 to stir at a frequency of 20-30 r / min. After the slurry is stirred evenly, open the air inlet valve, the fourth valve 12, and the first timer 14 to discharge the mother liquor. After the mother liquor in the washing machine 3 is discharged into the mother liquor tank 5, close the air inlet valve, the fourth valve 12, and the first timer 14. The mother liquor discharge time t1 is automatically fed back to the automatic control system.

[0034] Step (5): Draining the wash water: Wash the material after the mother liquor is discharged from the washing machine 3. After washing, open the fifth valve 13 and the second timer 15 to drain the wash water. After the wash water in the washing machine 3 is discharged into the washing water tank 6, close the fifth valve 13 and the second timer 15. The draining time t2 is automatically fed back to the automatic control system. Add dilute alkali and hot water to the washing machine 3 to wash the material after the mother liquor is discharged from the washing machine 3. The washing time is 45min-60min.

[0035] Step (Six): Alarm Feedback: If the mother liquor discharge time is within the predetermined mother liquor discharge time range T1 and the wash water discharge time is within the predetermined wash water discharge time range T2, alarm 16 will not sound an alarm; otherwise, alarm 16 will sound an alarm. That is, the central control room automatic control system judges the actual t1 and t2 values ​​against the set T1 and T2 values. If both t1∈T1 and t2∈T2 are satisfied, the alarm will not sound; otherwise, the alarm will sound.

[0036] Step (7): Discharge and maintenance: Open the third valve 11 to discharge the material after washing water from the washing machine 3 into the batching tank 4. According to the alarm situation in step (6), if the alarm 16 sounds, the first filter 8, the second filter 10, and the filter screen of the washing machine 3 are inspected. If the alarm 16 does not sound, the next round of material washing begins.

[0037] Example 1

[0038] Incoming material filtration: Open the first valve 7, and the slurry in the reactor is filtered by the first filter 8 and discharged into the aging tank 2. When the volume of the slurry reaches 4 / 5 of the volume of the aging tank 2, close the first valve 7.

[0039] After the slurry in the aging tank 2 is aged for 2 hours, aged slurry is obtained; the second valve 9 is opened, and the third valve 11, the fourth valve 12, and the fifth valve 13 are closed. The aged slurry is filtered by the second filter 10 and then enters the washing machine 3. The second valve 9 is then closed.

[0040] Time setting: Set the predetermined time range T1 for discharging mother liquor and the predetermined time range T2 for discharging washing water in the automatic control system in the central control room; the predetermined time range T1 for discharging mother liquor is 60min-70min, and the predetermined time range T2 for discharging washing water is 60min-70min.

[0041] Discharging mother liquor: Turn on the stirring mechanism of the washing machine 3 to stir at a speed of 30 r / min. After the slurry is stirred evenly, open the air inlet valve, the fourth valve 12, and the first timer 14 to discharge the mother liquor. After the mother liquor in the washing machine 3 is discharged into the mother liquor tank 5, close the air inlet valve, the fourth valve 12, and the first timer 14. The mother liquor discharge time t1 is 68 min, and t1 is automatically fed back to the automatic control system.

[0042] Draining the wash water: Add dilute alkali and hot water to the washing machine 3 to wash the material after the mother liquor is discharged from the washing machine 3 for 60 minutes. After washing, open the fifth valve 13 and the second timer 15 to drain the wash water. After the wash water in the washing machine 3 is drained into the washing water tank 6, close the fifth valve 13 and the second timer 15. The draining time t2 is 67 minutes, and t2 is automatically fed back to the automatic control system.

[0043] Alarm system feedback: The central control room automatic control system judges based on the actual t1 and t2 values ​​and the set T1 and T2. Since t1∈T1 and t2∈T2, the alarm does not sound.

[0044] Discharge and maintenance: Open the third valve 11 to discharge the material after washing water from the washing machine 3 into the batching tank 4. Since the alarm 16 did not sound, the next round of material washing begins.

[0045] Example 2

[0046] Incoming material filtration: Open the first valve 7, and the slurry in the reactor is filtered by the first filter 8 and discharged into the aging tank 2. When the volume of the slurry reaches 2 / 3 of the volume of the aging tank 2, close the first valve 7.

[0047] After the slurry in the aging tank 2 is aged for 1.7 hours, aged slurry is obtained; the second valve 9 is opened, and the third valve 11, the fourth valve 12, and the fifth valve 13 are closed. The aged slurry is filtered by the second filter 10 and then enters the washing machine 3. The second valve 9 is then closed.

[0048] Time setting: Set the predetermined time range T1 for discharging mother liquor and the predetermined time range T2 for discharging washing water in the automatic control system in the central control room; the predetermined time range T1 for discharging mother liquor is 60min-70min, and the predetermined time range T2 for discharging washing water is 60min-70min.

[0049] Discharging mother liquor: Turn on the stirring mechanism of the washing machine 3 to stir at a speed of 25 r / min. After the slurry is stirred evenly, open the air inlet valve, the fourth valve 12, and the first timer 14 to discharge the mother liquor. After the mother liquor in the washing machine 3 is discharged into the mother liquor tank 5, close the air inlet valve, the fourth valve 12, and the first timer 14. The mother liquor discharge time t1 is 65 min, and t1 is automatically fed back to the automatic control system.

[0050] Draining the wash water: Add dilute alkali and hot water to the washing machine 3 to wash the material after the mother liquor is discharged from the washing machine 3 for 50 minutes. After washing, open the fifth valve 13 and the second timer 15 to drain the wash water. After the wash water in the washing machine 3 is drained into the washing water tank 6, close the fifth valve 13 and the second timer 15. The draining time t2 is 63 minutes, and t2 is automatically fed back to the automatic control system.

[0051] Alarm system feedback: The central control room automatic control system judges based on the actual t1 and t2 values ​​and the set T1 and T2. Since t1∈T1 and t2∈T2, the alarm does not sound.

[0052] Discharge and maintenance: Open the third valve 11 to discharge the material after washing water from the washing machine 3 into the batching tank 4. Since the alarm 16 did not sound, the next round of material washing begins.

[0053] Example 3

[0054] Incoming material filtration: Open the first valve 7, and the slurry in the reactor is filtered by the first filter 8 and discharged into the aging tank 2. When the volume of the slurry reaches 3 / 5 of the volume of the aging tank 2, close the first valve 7.

[0055] After the slurry in the aging tank 2 is aged for 1.5 hours, aged slurry is obtained; the second valve 9 is opened, and the third valve 11, the fourth valve 12, and the fifth valve 13 are closed. The aged slurry is filtered by the second filter 10 and then enters the washing machine 3. The second valve 9 is then closed.

[0056] Time setting: Set the predetermined time range T1 for discharging mother liquor and the predetermined time range T2 for discharging washing water in the automatic control system in the central control room; the predetermined time range T1 for discharging mother liquor is 60min-70min, and the predetermined time range T2 for discharging washing water is 60min-70min.

[0057] Discharging mother liquor: Turn on the stirring mechanism of the washing machine 3 to stir at a speed of 20 r / min. After the slurry is stirred evenly, open the air inlet valve, the fourth valve 12, and the first timer 14 to discharge the mother liquor. After the mother liquor in the washing machine 3 is discharged into the mother liquor tank 5, close the air inlet valve, the fourth valve 12, and the first timer 14. The mother liquor discharge time t1 is 61 min, and t1 is automatically fed back to the automatic control system.

[0058] Draining the wash water: Add dilute alkali and hot water to the washing machine 3 to wash the material after the mother liquor is discharged from the washing machine 3 for 45 minutes. After washing, open the fifth valve 13 and the second timer 15 to drain the wash water. After the wash water in the washing machine 3 is drained into the washing water tank 6, close the fifth valve 13 and the second timer 15. The draining time t2 is 60 minutes, and t2 is automatically fed back to the automatic control system.

[0059] Alarm system feedback: The central control room automatic control system judges based on the actual t1 and t2 values ​​and the set T1 and T2. Since t1∈T1 and t2∈T2, the alarm does not sound.

[0060] Discharge and maintenance: Open the third valve 11 to discharge the material after washing water from the washing machine 3 into the batching tank 4. Since the alarm 16 did not sound, the next round of material washing begins.

[0061] The disclosed embodiments enable those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown, but is to be accorded the maximum scope consistent with the principles and features disclosed herein.

Claims

1. A device for improving material washing efficiency, characterized in that, The device includes a reactor (1), an aging tank (2), a washing machine (3), a batching tank (4), a mother liquor tank (5), a washing water tank (6), and an automatic control system. The reactor (1) and the aging tank (2) are connected by a pipe with a first filter (8). The aging tank (2) and the washing machine (3) are connected by a pipe with a second filter (10). The washing machine (3) and the batching tank (4) are connected by a discharge pipe. The washing machine (3) and the mother liquor tank (5) are connected by a mother liquor discharge pipe with a first timer (14). The washing machine (3) and the washing water tank (6) are connected by a washing water discharge pipe with a second timer (15). The washing machine (3) is equipped with an alarm (16). The first timer (14), the second timer (15), and the alarm (16) are all electrically connected to the automatic control system.

2. The apparatus for improving material washing efficiency according to claim 1, characterized in that, Both the first filter (8) and the second filter (10) are bag filters.

3. The apparatus for improving material washing efficiency according to claim 1, characterized in that, The washing machine (3) is a washing and pulping combined washing machine; the washing machine (3) is equipped with a stirring mechanism, and the washing machine (3) is connected to a container containing compressed gas through a pipe with an air inlet valve.

4. The apparatus for improving material washing efficiency according to claim 1, characterized in that, The pipeline connecting the reactor (1) and the aging tank (2) is equipped with a mechanical pump and a first valve (7), which is located between the reactor (1) and the first filter (8).

5. The apparatus for improving material washing efficiency according to claim 1, characterized in that, A mechanical pump and a second valve (9) are installed on the pipe connecting the aging tank (2) and the washing machine (3). The second valve (9) is located between the aging tank (2) and the second filter (10).

6. The apparatus for improving material washing efficiency according to claim 1, characterized in that, The discharge pipe is equipped with a mechanical pump and a third valve (11), the mother liquor discharge pipe is equipped with a mechanical pump and a fourth valve (12), and the wash water discharge pipe is equipped with a mechanical pump and a fifth valve (13).

7. The apparatus for improving material washing efficiency according to claim 1, characterized in that, The automatic control system includes a pressure sensor unit and a PLC control unit. The first timer (14) and the second timer (15) are electrically connected to the pressure sensor unit. The pressure sensor unit is used to collect water pressure signals and convert them into electrical signals. The PLC control unit is electrically connected to the alarm (16). The PLC control unit is used to determine the time conditions and output electrical signal commands to the alarm (16).

8. A method for improving the efficiency of material washing based on the apparatus according to any one of claims 1-7, characterized in that, The method includes the following steps: Step (1): Open the first valve (7), and the slurry in the reactor is filtered by the first filter (8) and discharged into the aging tank (2). Then close the first valve (7). Step (2): After the slurry in the aging tank (2) is aged, aged slurry is obtained; open the second valve (9), close the third valve (11), the fourth valve (12), and the fifth valve (13), and the aged slurry enters the washing machine (3) after being filtered by the second filter (10); close the second valve (9); Step (3): Set the predetermined time range for discharging mother liquor and the predetermined time range for discharging wash water in the automatic control system; Step (4): After the stirring mechanism of the washing machine (3) is turned on, the air inlet valve, the fourth valve (12) and the first timer (14) are turned on. After the mother liquor in the washing machine (3) is discharged into the mother liquor tank (5), the air inlet valve, the fourth valve (12) and the first timer (14) are turned off. The mother liquor discharge time is fed back to the automatic control system. Step (5): Wash the material after the mother liquor is discharged from the washing machine (3), then open the fifth valve (13) and the second timer (15). After the washing water in the washing machine (3) is discharged into the washing water tank (6), close the fifth valve (13) and the second timer (15). The time for discharging the washing water is fed back to the automatic control system. Step (6): If the mother liquor discharge time is within the predetermined mother liquor discharge time range and the wash water discharge time is within the predetermined wash water discharge time range, the alarm (16) will not sound an alarm; otherwise, the alarm (16) will sound an alarm. Step (7): Open the third valve (11) to discharge the material after washing water from the washing machine (3) into the batch tank (4). If the alarm (16) sounds, the first filter (8), the second filter (10), and the filter screen of the washing machine (3) are inspected. If the alarm (16) does not sound, the next round of material washing begins.

9. The method for improving the efficiency of material washing according to claim 8, characterized in that, In step (i), the slurry in the reactor is filtered by the first filter (8) and discharged into the aging tank (2). When the volume of the slurry reaches 3 / 5-4 / 5 of the volume of the aging tank (2), the first valve (7) is closed. In step (ii), the slurry in the aging tank (2) is aged for 1.5h-2h to obtain aged slurry. In step (ii), the aged slurry is filtered by the second filter (10) and enters the washing machine (3). When the volume of the aged slurry reaches 3 / 4-4 / 5 of the volume of the washing machine (3), the second valve (9) is closed.

10. The method for improving the efficiency of material washing according to claim 8, characterized in that, In step (iii), the predetermined time range for draining mother liquor is 60min-70min, and the predetermined time range for draining wash water is 60min-70min; in step (v), dilute alkali and hot water are added to the washing machine (3) to wash the material after the mother liquor is drained from the washing machine (3), and the washing time is 45min-60min.

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