Automatic zirconium ball cleaning and drying system for lithium iron phosphate sand mill

Abstract

The invention discloses an automatic zirconium ball cleaning and drying system for a lithium iron phosphate sand mill, and belongs to the technical field of sand mill maintenance. According to the production process flow, a first material is sanded by a sand mill and then dried by a spray dryer, the system comprises a cleaning machine, a drying box, a conveying unit and other structures, zirconium balls are discharged from the sand mill, cleaned in the cleaning machine, dried and screened through a zirconium ball discharging end and the conveying unit, and then the zirconium balls are conveyed to the drying box. The automatic zirconium ball washing, drying and nursing process of the sand mill is further provided with resource recovery equipment such as a first loop and a second loop, and drying tail gas generated in the drying box, drying tail gas generated in the spray dryer and cleaning water materials generated in the cleaning machine in the system are recovered and reused, so that the automatic zirconium ball washing, drying and nursing process is achieved. Heat energy and water resources of the whole system can be fully utilized, energy and materials needed by the whole production process are reduced, and cost reduction and efficiency improvement are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of sand mill maintenance, and in particular to an automatic cleaning and drying system for zirconium balls of a lithium iron phosphate sand mill. Background Art

[0002] After being used for a period of time, the zirconium balls in the sand mill need to be cleaned and dried. When the zirconium balls are dried in a drying box, the exhaust gas generated by the drying box contains a certain amount of moisture. In order to prevent the waste of water resources, condensers and other recovery equipment are often used to recycle the moisture in the exhaust gas. However, due to the low proportion of water content in the exhaust gas, the utilization efficiency of condensers and other recovery equipment is not high. Summary of the invention

[0003] The purpose of the present invention is to provide an automatic cleaning and drying system for zirconium balls of a lithium iron phosphate sand mill to solve one or more technical problems existing in the prior art and at least provide a beneficial choice or create conditions.

[0004] A technical solution is provided to solve the above technical problems: an automatic cleaning and drying system for zirconium balls in a lithium iron phosphate sand mill, which is used to wash and dry the zirconium balls in the sand mill. The automatic cleaning and drying system comprises: a cleaning machine for cleaning the zirconium balls; a drying box for drying the cleaned zirconium balls, the top of the drying box is provided with a first exhaust gas discharge end and the bottom is provided with an air inlet end, a first circuit is connected between the first exhaust gas discharge end and the air inlet end, the first circuit comprises a condensation dehumidification heat exchange device and an air heater which are sequentially connected to the first exhaust gas discharge end, a humidity sensor is provided between the first exhaust gas discharge end and the condensation dehumidification heat exchange device, the condensation dehumidification heat exchange device and the air heater are connected to the air inlet end, A compressed air supply end is connected between the devices, and a temperature sensor is arranged between the air heater and the air inlet end; the drying exhaust gas generated by the drying box passes through the first exhaust gas discharge end, the humidity sensor, the condensation dehumidification heat exchange device, the air heater, the temperature sensor and the air inlet end in sequence, and then returns to the drying box for recycling; when the humidity of the drying exhaust gas monitored by the humidity sensor exceeds a preset value, the condensation dehumidification heat exchange device is started to condense and exchange heat on the drying exhaust gas to recover the moisture in the drying exhaust gas; the air heater regulates the air temperature of the air inlet end according to the temperature measured by the temperature sensor, and the first circuit is also connected to a first induced draft fan for guiding air.

[0005] This technical solution has at least the following beneficial effects: the drying exhaust gas generated in the drying box passes through the condensation dehumidification heat exchange device and then returns to the drying box after the temperature and air intake volume are adjusted by the air heater and the compressed air supply end, so that the heat energy in the drying exhaust gas can be recovered. When a large amount of water vapor is accumulated in the drying exhaust gas after a certain degree of circulation, the condensation dehumidification heat exchange device is turned on to recover the moisture in the drying exhaust gas for reuse, so that the recovery efficiency of the condensation dehumidification heat exchange device is higher, and the heat energy and water resources in the drying exhaust gas are fully recovered and utilized, while the recovery cost can be reduced, so that the overall economic benefit of the system reaches a better state.

[0006] As a further improvement of the above technical solution, the sand mill is used for sand grinding in the first material production process, and the first material production process also includes using a spray dryer to spray dry the sand-milled first material; the spray dryer is provided with a second exhaust gas discharge end, and the second exhaust gas discharge end is connected between the condensation dehumidification heat exchange device and the air heater or connected between the first exhaust gas discharge end and the humidity sensor, and the second exhaust gas discharge end is equipped with a second induced draft fan for guiding air and a first solenoid valve for adjusting the air intake volume, and the dry exhaust gas generated by the spray dryer passes through the second induced draft fan and the first solenoid valve and enters the first circuit for recycling. In the production process of the first material such as lithium iron phosphate, it is necessary to firstly be sand-milled by a sand mill and then dried by a spray dryer. When the first material enters the spray dryer after sand-milling, the sand mill is stopped and the zirconium balls are taken out for cleaning, drying and other operations. At the same time, the first material enters the spray dryer for drying, and the dry exhaust gas generated by the spray dryer can be connected to the first circuit for use in the drying box, further reducing the burden on the air heater and making full use of the heat energy and water resources in the dry exhaust gas of the spray dryer. At the same time, the same set of recovery equipment is used to fully recover the energy and resources of different processes, which can further improve the overall energy recovery efficiency in the production process of the first material and make the overall economic benefits of the system reach a better state.

[0007] As a further improvement of the above technical solution, the sand mill is used for sand grinding in the first material production process, and the first material production process also includes using a spray dryer to spray dry the first material after sand grinding, and the spray dryer is provided with a spray feed end for feeding the first material; the cleaning machine is provided with a drainage end, and the drainage end is used to discharge the cleaning water after cleaning the zirconium balls, and the drainage end is connected to the spray feed end. When the zirconium balls are sand grinding the first material in the sand mill, a certain amount of the first material will be attached to the surface, and the cleaning water after cleaning the zirconium balls will contain a certain amount of the first material. The cleaning water and the sand-milled first material are dried together through the spray dryer, so that the cleaned first material can be fully collected and the loss of the first material can be reduced.

[0008] As a further improvement of the above technical solution, the cleaning machine is provided with a water inlet for introducing cleaning water, a second circuit for recycling cleaning water is connected between the water inlet and the drainage end, the second circuit is provided with a first water pump and a second electromagnetic valve in sequence from the drainage end, the spray feed end is connected to the second electromagnetic valve, and when the cleaning water reaches a preset condition, the second electromagnetic valve guides the cleaning water into the spray feed end. The cleaning water can be used to wash the zirconium balls multiple times, saving cleaning water. At the same time, the cleaning water formed after multiple washings of the zirconium balls has a higher content of the first material, thereby improving the efficiency of using a spray dryer to recover the first material from the cleaning water and reducing the cost of recovering the first material.

[0009] As a further improvement of the above technical solution, it also includes a water recovery tank, the condensation dehumidification heat exchange device collects moisture in the drying exhaust gas and stores it in the water recovery tank, the water recovery tank is provided with a water outlet, the sand mill is provided with a flushing end connected to the sand milling chamber, the cleaning machine is provided with a water inlet for introducing cleaning water, the water outlet is connected to the water inlet and / or the flushing end, and the water outlet is installed with a third solenoid valve for controlling the water output of the water recovery tank and a third water pump for conveying water. The water resources recovered from the drying exhaust gas are recycled, stored and reused, such as being fully used in the production process of the first material, thereby reducing the water resource consumption in the overall production process of the first material and saving water.

[0010] As a further improvement of the above technical solution, the drying box includes: a box body, a drying feeding end for feeding is arranged on the top and a first drying discharging end for discharging is arranged on the bottom, the first exhaust gas discharge end is arranged on the top of the box body, and the air inlet end is arranged on the bottom of the box body; a partition group, including two or more partitions, the partitions are obliquely installed in the box body, and the partitions are formed with first air holes. When the partition group includes more than two partitions, two adjacent partitions are distributed at intervals in the longitudinal direction and are arranged in opposite inclination directions, and the zirconium ball can fall from the lower end position of the partition at the top to the higher end position of the adjacent partition at the bottom when falling, the zirconium ball enters the box body from the drying feeding end and falls on the higher end position of the partition at the top, the zirconium ball is dried in turn in the process of all the partitions rolling down, and after the zirconium ball rolls to the lower end position of the partition group at the bottom, it is guided out of the box body from the first drying discharging end.

[0011] After the cleaned zirconium balls enter the drying box from the drying feed end, they roll through several partitions and fall out from the first drying discharge end. While the zirconium balls roll down on the partitions, hot air enters the box from the air inlet end and can fully dry the moisture on the surface of the zirconium balls through the first air vents, thereby achieving continuous drying of the zirconium balls. During the rolling process of the zirconium balls, the moisture on their surface can be more uniform and easier to dry, greatly improving the drying efficiency and quality of the zirconium balls. In addition, the zirconium balls in the drying box are almost fully loaded during the drying stage, maximizing the drying efficiency of the drying box, that is, the drying time required for completing different numbers of zirconium balls each time can also be determined based on the number of zirconium balls, saving the drying time required for all zirconium balls, that is, shortening the maintenance time and cost of the sand mill. On the other hand, the moisture and heat energy contained in the drying tail gas discharged from the first tail gas discharge end have greater stability, which is conducive to the recycling of the drying tail gas.

[0012] As a further improvement of the above technical solution, the width of the first air hole along the direction perpendicular to the rolling direction of the zirconium balls is limited to a preset value, so that when the zirconium balls roll down the partition net, the zirconium balls with a diameter less than or equal to the preset value pass through the first air hole to be screened. A plurality of collecting plates are also obliquely installed in the box body, and the number of the collecting plates is equal to the number of the partition nets. There is a collecting plate distributed under each of the partition nets. The box body is respectively provided with a second drying discharge end for discharging corresponding to the lower end of each collecting plate. The zirconium balls screened by the partition nets fall onto the collecting plate below. The zirconium balls on the collecting plate roll to the lower end of the collecting plate due to gravity and are then discharged from the second drying discharge end to the outside of the box body. While the zirconium balls are rolling on the partition net, small zirconium balls that do not meet the size requirements are screened out through the first air holes, and the small zirconium balls are collected through the collecting plate and recovered at the second drying discharge end, so that the zirconium balls that have been dried and flowed out from the first drying discharge end are screened simultaneously, thereby improving the overall efficiency of zirconium ball drying and screening, thereby shortening the time required for sand mill maintenance.

[0013] As a further improvement of the above technical solution, the top surface of the partition net is formed with a plurality of guide tracks which are distributed side by side and are used for the zirconium balls to roll. The guide tracks are bent in sequence along the two sides at intervals to form a plurality of inclined sections and turning sections. The turning section is used to connect two adjacent inclined sections. On the inclined plane where the partition net is located, an angle α greater than 0 and less than or equal to 90 degrees is formed between the length direction of the inclined section and the downward inclined direction of the partition net, so that the zirconium ball has a lateral displacement component when sliding along the guide track. The first air vent is arranged at the bottom of the guide track. When the angle α is equal to 90 degrees, the bottom wall of the inclined section is arranged to be inclined downward along the rolling direction of the zirconium ball. The guide track can guide the rolling of the zirconium balls, so that the rolling of each zirconium ball is orderly, and the rolling process of each zirconium ball is balanced. In addition, the inclined section can extend the rolling path of the zirconium ball within the limited partition net space, ensuring that there is sufficient time to dry the zirconium ball. When the angle α is equal to 90 degrees, the falling time of the zirconium balls can be shortened and no triangular area is generated between the multiple inclined sections due to the need to guide the zirconium balls to fall. This allows the longitudinal position on the partition net to be fully utilized and the path length of the guide track to be maximized in the limited upper surface area of ​​the partition net. While ensuring the drying quality of the zirconium balls, the number of partition nets required can be reduced and the overall size of the drying box can be reduced.

[0014] As a further improvement of the above technical solution, it also includes a transportation unit, which includes a horizontal carrying track, a lifting device and a flipping and unloading device. The zirconium balls cleaned by the cleaning machine are transferred to the top of the drying feed end through the horizontal carrying track and the lifting device, and then the zirconium balls are poured from the drying feed end into the box for drying through the flipping and unloading device. The sand mill is provided with a zirconium ball filling end for the zirconium balls to be placed in. The zirconium balls dried in the drying box are transferred to the top of the zirconium ball filling end through the horizontal carrying track and the lifting device, and then the zirconium balls are poured from the zirconium ball filling end into the sand mill through the flipping and unloading device. The sand mill is provided with a zirconium ball discharge end for discharging the zirconium balls. The cleaning machine is provided with a cleaning feed end for the zirconium balls to be placed in. The zirconium ball discharge end is connected to the cleaning feed end and is equipped with a discharge valve.

[0015] The zirconium balls in the sand mill can be discharged through the zirconium ball discharge port and directly enter the cleaning machine for cleaning, reducing the trouble of manual operation and improving the efficiency of zirconium ball cleaning. The transport unit can transport the cleaned zirconium balls to the drying box for drying, and then transport the dried zirconium balls back to the sand mill, realizing the fully automatic cleaning and drying process, further reducing the trouble of manual operation and improving the efficiency of zirconium ball care.

[0016] Another technical solution provided to solve the above technical problems: a method for automatically cleaning and drying zirconium balls for lithium iron phosphate sand mill, characterized in that the zirconium balls are cleaned and dried by using the above-mentioned automatic cleaning and drying system for zirconium balls for lithium iron phosphate sand mill, and the automatic cleaning and drying method for zirconium balls comprises the following steps: taking the zirconium balls to be cleaned out of the sand mill and putting them into the cleaning machine for cleaning; putting the cleaned zirconium balls into the drying box for drying; putting the dried zirconium balls back into the sand milling chamber of the sand mill; wherein, during the process of the zirconium balls being dried in the drying box, the humidity sensor and the temperature sensor respectively monitor the air in the first circuit, when the drying tail gas monitored by the humidity sensor does not exceed the preset value, the heat energy of the drying tail gas is recovered and utilized through the first circuit, when the drying tail gas reaches the preset humidity, the water vapor in the drying tail gas is recovered through the condensation dehumidification heat exchange device, and the air heater regulates the air temperature at the air inlet end according to the temperature monitored by the temperature sensor. While ensuring the drying effect of the drying box, the heat energy of the drying exhaust gas is recovered, and condensation and dehumidification are performed when the humidity of the drying exhaust gas reaches the preset value, so that the water resources in the drying exhaust gas can be efficiently recovered, the recovery cost can be reduced, and the overall economic benefit of the system can be achieved in a better state. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 Schematic diagram of the connection structure of the first loop in an embodiment of the present invention;

[0019] Figure 2 A schematic diagram of the connection structure of the transport unit in an embodiment of the present invention;

[0020] Figure 3 A schematic diagram of the reuse of water resources recovered by the first loop in an embodiment of the present invention;

[0021] Figure 4 A schematic diagram of the overall connection structure of the system in an embodiment of the present invention;

[0022] Figure 5 This is a schematic diagram of the internal structure of the box in an embodiment of the present invention;

[0023] Figure 6 This is a schematic diagram of the isolation network structure in an embodiment of the present invention;

[0024] Figure 7 Schematic diagram of another type of structure of the partition net in the embodiment of the present invention;

[0025] Figure 8This is a schematic diagram of the structure of a partition screen in another embodiment of the present invention;

[0026] Fig. 9 It is a schematic structural diagram of another type of partition net in another embodiment of the present invention.

[0027] 100, sand mill; 101, flushing end; 110, zirconium ball packing end; 120, zirconium ball discharge end; 130, discharge valve;

[0028] 200, spray dryer; 210, second tail gas discharge end; 211, waste gas discharge end; 220, second induced draft fan; 230, first solenoid valve; 240, spray feed end;

[0029] 300, cleaning machine; 310, drainage end; 320, water inlet end; 330, second circuit; 331, first water pump; 332, second solenoid valve; 333, sewage pipe; 340, cleaning feed end; 350, cleaning tank; 360, water collection tank;

[0030] 400, drying box; 410, box body; 420, first exhaust gas discharge end; 430, air inlet end; 440, drying feed end; 450, first drying discharge end; 460, second drying discharge end; 470, screen group; 480, screen; 481, first air hole; 482, guide rail; 483, inclined section; 484, turning section; 490, collecting plate;

[0031] 500, first circuit; 510, humidity sensor; 520, condensation dehumidification heat exchange device; 530, compressed air supply end; 540, air heater; 550, temperature sensor; 560, first induced draft fan; 570, pure water supply end; 580, drying tail gas venting pipeline;

[0032] 600, recovery water tank; 601, water outlet; 602, third solenoid valve; 603, third water pump; 610, cleaning water tank; 620, second water pump; 700, transport unit; 711, first carrier track; 712, second carrier track; 713, third carrier track; 721, first lifting device; 722, second lifting device; 731, first unloading device; 732, second unloading device; 800, ton bag. DETAILED DESCRIPTION

[0033] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0034] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0035] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0036] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0037] During the production of lithium iron phosphate, a positive electrode material for batteries, the lithium iron phosphate production process includes a sanding process and a spray drying process. When the first material as an intermediate product is sanded, the sanding process includes coarse grinding and fine grinding. Usually, the sand mill 100 in the coarse grinding uses zirconium balls made of 95% zirconium oxide and with a diameter of 0.6-0.7 mm, and the sand mill 100 in the fine grinding uses zirconium balls made of 95% zirconium oxide and with a diameter of 0.3-0.35 mm. A sanding chamber is provided in the sand mill 100, and zirconium balls are stored in the sanding chamber. The first material is placed in the sanding chamber, and the first material can be sanded by the zirconium balls. The first material after sanding enters the spray dryer 200 for spray drying.

[0038] Reference Figure 1-4 The automatic cleaning and drying system for zirconium balls of lithium iron phosphate sand mill includes a cleaning machine 300 and a drying box 400. When the sand mill 100 is stopped, in order to prevent the residual materials in the equipment from solidifying for a long time and causing the equipment to be unable to start, the zirconium balls in the sand mill 100 can be taken out, and the cleaning machine 300 is used to clean the zirconium balls, and the drying box 400 is used to dry the zirconium balls, so that the zirconium balls can be placed for a long time and reused.

[0039] The cleaning machine 300 includes an ultrasonic generator and a cleaning tank 350. The cleaning tank 350 is provided with a water inlet 320 for introducing cleaning water and a cleaning feed end 340 for placing zirconium balls. The cleaning tank 350 is provided with a water collection tank 360 at the bottom. The water inlet 320 is connected to a pure water supply end 570. After the zirconium balls to be cleaned are placed into the cleaning tank 350 from the cleaning feed end 340, pure water is introduced from the pure water supply end 570 through the water inlet 320 as cleaning water. The ultrasonic generator can use ultrasonic waves to clean the zirconium balls. After cleaning the zirconium balls, the cleaning water forms cleaning water and flows into the water collection tank 360 for temporary storage to achieve the cleaning of the zirconium balls. The bottom of the water collection tank 360 is provided with a drainage end 310, and the drainage end 310 can discharge the cleaning water in the water collection tank 360. In other embodiments, the cleaning machine 300 can also use an agitator to stir and clean the zirconium balls in the cleaning tank 350.

[0040] The drying box 400 includes a box body 410, an air inlet 430 is provided at the bottom of the box body 410, a first tail gas discharge end 420 is provided at the top of the box body 410, and a drying feed end 440 is provided at the top. The zirconium balls are placed into the drying box 400 from the drying feed end 440, and hot air is introduced into the air inlet end 430. The hot air flows in the box body 410 and dries the moisture on the surface of the zirconium balls. The drying tail gas generated by drying the zirconium balls is discharged from the first tail gas discharge end 420 to achieve the drying treatment of the zirconium balls. In other embodiments, the drying box 400 can also use an electric heating tube to dry the zirconium balls.

[0041] Among them, the first circuit 500 is connected between the first tail gas discharge end 420 and the air inlet end 430 through a pipeline. The first circuit 500 includes a condensation dehumidification heat exchange device 520 and an air heater 540. The condensation dehumidification heat exchange device 520 is arranged in the first circuit 500 near the first tail gas discharge end 420, and the air heater 540 is arranged in the first circuit 500 near the air inlet end 430. The dry tail gas generated in the box 410 is first dehumidified by the condensation dehumidification heat exchange device 520, then enters the air heater 540 for heating, and then enters the box 410 from the air inlet end for recycling, so as to realize the recycling of heat energy and water resources of the dry tail gas.

[0042] The condensation dehumidification heat exchange device 520 includes a connection channel connected to the first circuit 500 and a condensation channel arranged outside the connection channel, and a water collecting end is also arranged at the bottom of the connection channel. When the condensation dehumidification heat exchange device 520 is not turned on, the connection channel is equivalent to an ordinary pipeline and only serves as a circulation. When the condensation channel is connected to the pure water supply end 570, low-temperature pure water flows through the condensation channel, and the low-temperature pure water can condense the drying exhaust gas in the connection channel, so that the water vapor in the drying exhaust gas reaches a saturated state and is converted into liquid water. The liquid water flows out from the water collecting end to achieve the effect of dehumidifying the drying exhaust gas.

[0043] A humidity sensor is installed in the first loop 500 between the first tail gas discharge end 420 and the condensation dehumidification heat exchange device 520. The humidity sensor can be used to monitor the humidity of the dry tail gas. The humidity sensor is connected to the condensation dehumidification heat exchange device 520 for communication, so that the condensation dehumidification heat exchange device 520 receives the humidity monitoring result signal of the humidity sensor, and when the humidity monitoring result signal shows that the humidity of the dry tail gas exceeds the preset value, the condensation dehumidification heat exchange device is started to condense and heat the dry tail gas, and the moisture in the dry tail gas is efficiently recovered. Thereby, the water resource recovery efficiency of the condensation dehumidification heat exchange device 520 can be improved.

[0044] A temperature sensor 550 is installed in the first loop 500 and between the air heater 540 and the air inlet 430. The temperature sensor 550 can be used to monitor the temperature of the hot air that will enter the box 410 from the air inlet 430, that is, the drying temperature. The temperature sensor 550 is connected to the air heater 540 for communication. The air heater can receive the temperature monitoring result signal of the temperature sensor 550, and adjust its own working conditions according to the temperature monitoring result signal, so as to control the temperature of the hot air within a preset range and ensure the stability of the drying temperature in the box 410.

[0045] A first induced draft fan 560 is installed in the first loop 500 and between the first tail gas discharge end 420 and the humidity sensor. The first induced draft fan 560 can be used to promote air circulation in the first loop 500. A compressed air supply end 530 is connected to the first loop 500 and between the condensation dehumidification heat exchange device 520 and the air heater 540. The compressed air supply end 530 can control the amount of compressed gas added to the first loop 500 through a valve to regulate the air circulation in the first loop 500 and ensure the drying effect of the hot air. The compressed air supply end 530 can be used in conjunction with a flow meter for detecting the air flow of the first loop 500. In other embodiments, the first induced draft fan 560 can also be installed between two adjacent components in the first loop 500, such as between the humidity sensor 510 and the condensation dehumidification heat exchange device 520.

[0046] When the zirconium balls are dried, the drying exhaust gas in the box 410 is introduced into the first loop 500. In the initial stage, the humidity of the drying exhaust gas is low, and the temperature can be directly regulated by the air heater and the flow rate can be regulated by the compressed air supply end 530 without activating the condensation dehumidification heat exchange device, and then returned to the box 410 for reuse, so as to achieve the effect of recovering the heat energy of the drying exhaust gas. When the drying exhaust gas is reused many times, the moisture content and humidity in the drying exhaust gas are high, so that the humidity monitoring result signal fed back by the humidity sensor to the condensation dehumidification heat exchange device indicates that the humidity has reached the preset value. At this time, the condensation dehumidification heat exchange device is started to dehumidify the drying exhaust gas, thereby ensuring the drying effect of the zirconium balls. At the same time, it can also reduce the cost of water resource recovery and improve the recovery efficiency of water resources. The technical solution of this embodiment can fully recycle the heat energy and water resources in the drying exhaust gas, while also reducing the recovery cost, so that the overall economic benefit of the system reaches a better state.

[0047] The spray dryer 200 is provided with a spray feed end 240 and a second tail gas discharge end 210. The first material after sand grinding enters the spray dryer 200 from the spray feed end 240 for drying, so that the first material after sand grinding is formed into granules or powder and collected. The dry tail gas generated by the drying process in the spray dryer 200 is discharged from the second tail gas discharge end 210. Further, the second tail gas discharge end 210 is connected to the first circuit 500 through a pipeline and is located between the compressed air supply end 530 and the condensation dehumidification heat exchange device 520. A second induced draft fan 220 and a first solenoid valve 230 are also connected between the second tail gas discharge end 210 and the first circuit 500. The second induced draft fan 220 can be used to introduce the dry tail gas into the first circuit 500, and the first solenoid valve 230 can adjust the amount of dry tail gas entering the first circuit 500.

[0048] By opening the first solenoid valve 230 and the second induced draft fan 220, the dry exhaust gas is introduced into the first loop 500, and the dry exhaust gas is recovered and utilized in the drying process of the zirconium balls, so that the thermal energy of the dry exhaust gas can be fully utilized. After entering the first loop 500, the dry exhaust gas can be recycled and utilized for water resources through the condensation dehumidification heat exchange device 520, thereby achieving energy-saving effects, and the water resource recovery efficiency of the condensation dehumidification heat exchange device 520 can be further improved.

[0049] In another embodiment, the second exhaust gas discharge port 210 may also be connected to the first loop 500 and located between the first exhaust gas discharge port 420 and the humidity sensor 510. When the heat energy of the dry exhaust gas is recovered and utilized, the dry exhaust gas is first mixed with the drying exhaust gas, and then the humidity of the mixed gas is monitored to see if it meets the requirements. When the humidity of the mixed gas exceeds the preset value, the condensation dehumidification heat exchange device 520 is started to dehumidify the mixed gas, and then the heat energy is recovered and utilized to ensure the drying effect of the zirconium balls.

[0050] Furthermore, in the cleaning machine 300, the drainage end 310 at the bottom of the water collection tank 360 is connected to the spray feed end 240 of the spray dryer 200 through a pipe, so that the cleaning water obtained after cleaning the zirconium balls can be introduced into the spray feed end 240 and spray dried together with the first material after sand grinding or successively to recover the first material after sand grinding in the cleaning water.

[0051] Furthermore, a second circuit 330 is connected between the water inlet 320 and the drain end 310 of the cleaning machine 300 through a pipeline, and a first water pump 331 and a second solenoid valve 332 are installed on the second circuit 330. In the second circuit 330, the first water pump 331 is installed at a position close to the drain end 310, and the second solenoid valve 332 is installed at a position close to the water inlet 320. The spray feed end 240 is connected to the second solenoid valve 332 through a pipeline. It can be understood that the second solenoid valve 332 is a three-way control valve. In other embodiments, the second solenoid valve 332 may also include two separate valve components respectively installed in a branch connected to the water inlet 320 and a branch connected to the spray feed end 240. After the first cleaning of the zirconium ball, the zirconium ball is generally not cleaned, and the first water pump 331 and the second solenoid valve 332 are opened, and the second solenoid valve 332 guides the cleaning water into the second circuit 330, that is, the branch connected to the water inlet end 320. The cleaning water remaining in the water collection tank 360 can be led back to the cleaning tank 350 through the second circuit 330 to repeatedly clean the zirconium ball, saving cleaning water. When the cleaning water reaches the preset conditions, such as when the cleaning water is turbid enough, close the end of the second solenoid valve 332 connected to the water inlet end 320, and open the end of the second solenoid valve 332 connected to the spray feed end 240, and guide the turbid cleaning water into the spray feed end 240 through the first water pump 331 for spray drying. The content of the first material in the turbid cleaning water is relatively large, so that the cost of recycling the first material in the cleaning water by using the spray dryer 200 can be reduced.

[0052] In addition, before the spray feed end 240 is connected to the second solenoid valve 332, a transitional cleaning water tank 610 can be connected, and a second water pump 620 is connected between the cleaning water tank 610 and the spray feed end 240, and the second water pump 620 can pump the cleaning water in the cleaning water tank 610 to the spray feed end 240. Turbid cleaning water can be stored in the cleaning water tank 610 first, and by coordinating the time arrangement of using the spray dryer 200 to dry the first material after sand grinding, the spray dryer 200 can be fully utilized to dry and recover the first material in the cleaning water, thereby reducing the loss of the first material in the sand grinding process.

[0053] The sand mill 100 is provided with a zirconium ball discharge end 120 connected to the sand milling chamber. The zirconium ball discharge end 120 is connected to the cleaning feed end 340 of the cleaning machine 300 through a pipeline, and a discharge valve 130 is installed between the zirconium ball discharge end 120 and the cleaning feed end 340. When the zirconium ball needs to be cleaned, the zirconium ball can be directly introduced into the cleaning tank 350 for cleaning by opening the discharge valve 130, thereby reducing the trouble of manually opening the sand mill to take out the zirconium ball and improving the efficiency of cleaning the zirconium ball. In addition, when the zirconium ball is discharged into the cleaning tank 350 through the zirconium ball discharge end 120, the sand milling chamber of the sand mill 100 can be flushed simultaneously. The flushing water can promote the discharge of the zirconium ball and flush the first material remaining in the sand milling chamber into the cleaning tank 350. Then, by introducing the corresponding cleaning water into the spray dryer 200 for recycling, the first material remaining in the sand milling chamber can also be recycled, thereby further reducing the loss of the first material in the sand milling process.

[0054] Further, the water collection end of the condensation dehumidification heat exchange device 520 is connected to a recovery water tank 600, which can be used to store water recovered from the drying exhaust gas. The bottom of the recovery water tank 600 is provided with a water outlet 601, and the water outlet 601 is installed with a third solenoid valve 602 and a third water pump 603. The third solenoid valve 602 can be used to control the water output of the recovery water tank 600, and the third water pump 603 is used to pump out the water in the recovery water tank 600. The top of the sand mill 100 is provided with a flushing end 101, which is connected to the sand mill chamber, and the flushing end 101 is connected to the pure water supply end 570, and the pure water supply end 570 can provide the sand mill 100 with water required for cleaning the sand mill chamber.

[0055] The water outlet 601 of the recovery water tank 600 is connected to the flushing end 101 of the sand mill 100 and the water inlet 320 of the cleaning machine 300, that is, the water outlet 601 of the recovery water tank 600 is arranged in parallel with the pure water supply end 570. Therefore, the water in the recovery water tank 600 can be used for cleaning the sand mill chamber of the sand mill 100 and the zirconium balls of the cleaning machine 300, making full use of the water resources recovered from the drying tail gas, reducing the water supply of the pure water supply end 570, and saving water resources.

[0056] In other embodiments, the water outlet 601 may also be separately connected to the flushing end 101 of the sand mill 100 or the water inlet 320 of the cleaning machine 300 , so as to separately provide water for flushing the sanding chamber of the sand mill 100 or cleaning the zirconium balls in the cleaning machine 300 .

[0057] In other embodiments, the water collecting end of the condensation dehumidification heat exchange device 520 can also be directly or independently connected to the water inlet end 320 of the cleaning tank 350 through pipes and valves to serve as cleaning water for cleaning zirconium balls; the water collecting end of the condensation dehumidification heat exchange device 520 can also be directly or independently connected to the sanding chamber through pipes and valves to flush the sanding chamber.

[0058] It should be noted that, in order for the automatic cleaning and drying system of the present application to operate normally, in conventional technology, a drying tail gas venting pipe 580 is connected to the first loop 500. The drying tail gas venting pipe 580 can discharge the drying tail gas circulating in the first loop 500 through a valve. Specifically, the drying tail gas venting pipe 580 is connected between the condensation dehumidification heat exchange device 520 and the air heater 540. The second tail gas discharge end 210 of the spray dryer 200 is also connected to the exhaust gas discharge end 211, and the exhaust gas discharge end 211 is connected between the second induced draft fan 220 and the first solenoid valve 230. When it is not necessary to dry the zirconium balls, the dry tail gas generated in the spray dryer 200 can be discharged from the exhaust gas discharge end 211 through the valve. In addition, a sewage pipe 333 for discharging the washing water is also connected to the second loop 330. When it is not necessary to recycle and reuse the washing water, the sewage pipe 333 discharges the washing water through a valve. In addition, valves used to control on-off can be appropriately increased or decreased on the pipeline connecting two components according to actual needs.

[0059] Reference Figure 4-5 Specifically, a first drying discharge terminal 450 is provided at the bottom of the box body 410. A partition mesh group 470 is installed in the box body 410, and the partition mesh group 470 includes two partition meshes 480. The two partition meshes 480 are spaced apart along the longitudinal direction, i.e., the vertical direction, and the two partition meshes 480 are arranged to be inclined in opposite directions to each other, so that one end of the partition mesh 480 is at a higher position and the other end is at a lower position. The lower end of the upper partition mesh 480 is located above the higher end of the lower partition mesh 480, so that when the zirconium ball rolls down from the lower end of the upper partition mesh 480, it can fall to the higher end of the lower partition mesh 480, thereby ensuring the continuity of the zirconium ball rolling down between two adjacent partition meshes 480. The partition meshes 480 are all provided with first air holes 481. When the zirconium balls enter the box 410 from the drying feed end 440, the zirconium balls can just fall onto the higher end of the upper partition net 480, and under the action of gravity, the zirconium balls roll from the higher end of the upper partition net 480 to the lower end of the upper partition net 480, then fall to the higher end of the lower partition net 480, and then roll from the higher end of the lower partition net 480 to the lower end of the lower partition net 480, and then flow out of the box 410 from the first drying discharge end 450.

[0060] When hot air flows in the box 410, the hot air can flow to the top of the partition 480 through the first air hole 481 to dry the zirconium balls. And when the zirconium balls roll on the partition 480, the moisture on their surface is constantly contacted and smeared by the partition 480, etc., so that the moisture on the surface of the zirconium balls is easier to be dried, improving the quality and efficiency of drying. In addition, the zirconium balls enter the box 410 from the drying feed end 440, and then roll down from the two partitions 480 to the first drying discharge end 450 in sequence, completing the drying process at the same time, so that the drying of the zirconium balls has sustainable connectivity, and the time to complete the drying of all zirconium balls is basically positively correlated with the number of zirconium balls, which improves the flexibility and efficiency of drying different numbers of zirconium balls.

[0061] In other embodiments, the internal structure of the box 410 may also be a multi-layer partition distributed in the box 410 at a certain interval, and a door is provided on one side of the box 410, and the zirconium balls are taken in and placed by opening the box 410, thereby achieving the drying of the zirconium balls. However, due to the limited space in the box 410, if the number of zirconium balls exceeds the maximum capacity of the box 410, all the zirconium balls need to be dried in batches, and each drying requires the same time, so the time to complete the drying of all the zirconium balls is limited to the number of batches multiplied by the time required for each drying. When the number of zirconium balls dried in the last batch is less than the maximum capacity of the box 410, the drying space in the box 410 is not fully utilized, and the drying takes a long time, the efficiency is low, and it is not conducive to the full utilization of resources.

[0062] In other embodiments, only one, three, four or other numbers of partition nets 480 may be provided in the partition net group 470. When the partition net group 470 has a plurality of partition nets 480, the plurality of partition nets 480 are spaced and arranged in a longitudinal direction, i.e., in a vertical direction, and the plurality of partition nets 480 are arranged in an inclined direction, and the inclination directions of two adjacent partition nets 480 are opposite. After the zirconium ball enters the box body 410 from the drying feed end 440, it falls on the higher end position of the partition net 480 at the top, and under the action of gravity, the zirconium ball rolls down from top to bottom on each partition net 480 in turn, and after rolling down from the lower end position of the bottom partition net 480, it falls into the first drying discharge end 450 for discharge.

[0063] Among them, the first air hole 481 is set to have a width in a direction perpendicular to the rolling direction of the zirconium balls as a preset value, and the preset value is determined according to the screening standard of the zirconium balls. When the zirconium balls roll on the partition 480, zirconium balls with a diameter less than or equal to the preset value, that is, smaller zirconium balls that do not meet the size requirements, will pass through the first air hole 481 to the bottom of the partition 480, thereby achieving the effect of screening the zirconium balls, so that the zirconium balls finally coming out of the first drying discharge end 450 can meet the use standards.

[0064] A collecting plate 490 is also provided in the box 410. There are two collecting plates 490. The two collecting plates 490 are respectively distributed under the two partitions 480 in a one-to-one correspondence. The two collecting plates 490 are both inclined. A second drying discharge end 460 is provided at the box 410 corresponding to the lower end of each collecting plate 490. The zirconium balls screened out from the first air holes 481 of the upper partition 480 can fall into the collecting plate 490 located above, and under the action of gravity, they are gathered at the lower end of the upper collecting plate 490 and fall into the corresponding second drying discharge end 460; similarly, the zirconium balls screened out from the first air holes 481 of the lower partition 480 can fall into the collecting plate 490 located below, and under the action of gravity, they are gathered at the lower end of the lower collecting plate 490 and fall into the corresponding second drying discharge end 460. In this way, the zirconium balls that do not meet the conditions that are screened out can be collected.

[0065] It can be understood that the collection plate 490 only needs to cover the position below the partition net 480 where the zirconium balls may be screened and dropped, and a gap is provided between the collection plate 490 and the wall of the box body 410, and the collection plate 490 is a strip mesh structure extending along the inclined direction of the collection plate 490 or a criss-cross grid mesh structure to reduce the impact on the flow of hot air.

[0066] The first drying discharge end 450 can be set as a first receiving funnel, and the bottom of the first receiving funnel extends to the outside of the box 410, so as to collect zirconium balls that meet the size requirements outside the box 410. The second drying discharge end 460 can also be set as a second receiving funnel, and the bottoms of the two second receiving funnels are connected and then extend to the outside of the box 410, so as to collect zirconium balls that do not meet the size requirements outside the box 410.

[0067] It should be noted that there is no necessary correlation between the inclination direction of the collecting plate 490 and the inclination direction of the corresponding partition net 480 above. In order to avoid the influence of the second drying discharge end 460 on the rolling of the zirconium balls, the inclination direction of the collecting plate 490 is not the same as the inclination direction of the corresponding partition net 480 above, and preferably, the inclination direction of the collecting plate 490 is set opposite to the inclination direction of the corresponding partition net 480 above.

[0068] In other embodiments, only one, three, four or other numbers of collecting plates 490 may be provided, but the number of collecting plates 490 is less than or equal to the number of partition nets 480, and when the number of collecting plates 490 is less than the number of partition nets 480, the collecting plates 490 are preferentially allocated to the upper partition nets 480. For example, when only one collecting plate 490 is provided, the collecting plate 490 is located at the corresponding lower position of the uppermost partition net 480.

[0069] Therefore, after the zirconium balls enter the box 410 from the drying feed end 440, they roll down on the two partitions 480 in turn. In the process of the zirconium balls rolling down on the partitions 480, the surface moisture can be dried quickly and the zirconium balls that do not meet the size requirements can be screened out at the same time. The smaller zirconium balls screened out can be collected at the second drying discharge end 460 through the collecting plate 490, so that the zirconium balls continuously sent out from the first drying discharge end 450 can be directly reused. The efficiency of zirconium ball drying and screening is greatly improved.

[0070] It should be noted that the partition screen 480 and the collection plate 490 can be installed in the box 410 in a detachable manner. When it is necessary to process zirconium balls of different sizes and different screening size requirements, such as the zirconium balls used in fine grinding and coarse grinding, they can be shared by replacing the corresponding standard partition screen 480 and / or collection plate 490.

[0071] Reference Figure 5-7 Specifically, the top surface of the partition 480 is provided with a plurality of guide rails 482 arranged side by side, and one guide rail 482 is bent and arranged in intervals along the direction of the partition 480 tilting downward in sequence along the two sides, thereby forming a plurality of inclined sections 483 and turning sections 484 that are spaced apart from each other, and the turning section 484 is used to connect two adjacent inclined sections 483. That is, the guide rail 482 is arranged in an S-shaped bending as a whole. Based on the surface of the partition 480, i.e., the inclined plane, an angle α is formed between the extension direction, i.e., the length direction, of the inclined section 483 and the tilting direction of the partition 480, and the angle α is greater than 0 degrees and less than or equal to 90 degrees, i.e., the inclined section 483 has a horizontal lateral displacement component perpendicular to the tilting direction of the partition 480. It should be noted that the blank area in the partition 480, such as the triangular area between two adjacent inclined sections 483, can be set up in a hollow space, so that hot air can also flow through the hollow area, thereby ensuring the efficient circulation of the drying hot air.

[0072] The first air hole 481 is set at the bottom of the guide track 482, so that hot air can pass through the first air hole 481 to dry the moisture on the surface of the zirconium ball. Since the zirconium ball is spherical, there is a large gap between two adjacent zirconium balls on the guide track 482. Therefore, when the hot air passes through the first air hole 481 and passes between two adjacent zirconium balls, it can quickly take away the moisture on the surface of the zirconium ball, thereby improving the drying efficiency. The zirconium ball enters the guide track 482 from one end of the guide track 482 and forms an S-shaped rolling path along the guide track 482, which can extend the path of the zirconium ball rolling on a single partition 480, thereby reducing the number of partitions 480 set, and ensuring the drying effect of the zirconium ball. In addition, under the guidance of the guide track 482, the zirconium ball rolls down on the partition 480 in an orderly manner, reducing the situation where the zirconium balls are squeezed and blocked.

[0073] Reference Figure 8-9When the angle α is equal to 90 degrees, the extension direction of the inclined section 483 is perpendicular to the downward inclination direction of the partition net 480, and the inclined section 483 has a certain inclination in the longitudinal direction, that is, the bottom wall of the inclined section 483 is arranged to be inclined downward along the rolling direction of the zirconium ball, thereby ensuring the rolling ability of the zirconium ball on the inclined section 483. Since two adjacent inclined sections 483 are arranged in parallel when projected on the horizontal plane, the width occupied by each inclined section 483 in the inclination direction of the partition net 480 can be greatly shortened, and a longer guide track 482 is formed on the limited plane of the partition net 480, thereby extending the drying time of the zirconium ball and ensuring the drying effect of the zirconium ball.

[0074] It can be understood that the partition net 480 can be a plate-like structure with slots and holes opened thereon to form the partition net 480 and the guide track 482 structure and the first air vent 481 structure thereon. The partition net 480 can also be a mesh structure formed by a combination of multiple rods, with two adjacent guide rods arranged in parallel to form the guide track 482.

[0075] Reference Figure 1-4 Furthermore, the automatic cleaning and drying system also includes a transport unit 700, which includes a horizontal transport track, a lifting device and a flipping and unloading device. The horizontal transport track includes a first transport track 711, a second transport track 712 and a third transport track 713, and the first transport track 711, the second transport track 712 and the third transport track 713 can all be roller conveyor belt structures; the lifting device includes a first lifting device 721 and a second lifting device 722, and the first lifting device 721 and the second lifting device 722 can both be lifting structures driven by cylinders or hydraulic cylinders; the flipping and unloading device includes a first unloading device 731 and a second unloading device 732, and the first unloading device 731 and the second unloading device 732 can both be structures that realize flipping by driving the rotating shaft with a motor.

[0076] The top of the sand mill 100 is provided with a zirconium ball filling end 110 connected to the sand milling chamber. The first transport track 711 is provided at the bottom of the cleaning tank 350, and can horizontally transport the zirconium balls in the cleaning tank 350 or the material box for loading the zirconium balls to a preset position, and then be lifted to a preset height by the first lifting device 721, and then be transported to the position of the box body 410 corresponding to the drying feed end 440 by the second transport track 712, and then be turned over by the first pouring device, and the zirconium balls are poured into the drying feed end 440, so as to automatically transport the cleaned zirconium balls to the box body 410 for drying.

[0077] The conveying end of the second lifting device corresponds to the bottom of the first drying and discharging end 450, and the zirconium balls discharged from the first drying and discharging end 450 can fall on the conveying end of the second lifting device 722, so that the second lifting device 722 can lift the dried zirconium balls to a preset height, and then transport them to the top of the zirconium ball filling end 110 of the sand mill 100 by the third carrying track 713. By opening the zirconium ball filling end 110 and using the second pouring device 732, the zirconium balls that meet the standard use conditions after cleaning, drying and screening are poured into the sand mill cavity. The automatic transportation and care process of the zirconium balls is realized, reducing the trouble of manual operation.

[0078] A ton bag 800 corresponding to the second drying discharge end 460 is arranged on one side of the box body 410 , and the ton bag 800 is used to collect zirconium balls that do not meet the size requirements and are discharged from the second drying discharge end 460 .

[0079] Reference Figure 1-9 , the embodiment of the present application also provides an automatic cleaning and drying method for zirconium balls in a lithium iron phosphate sand mill, and the zirconium balls are cleaned and dried by the above-mentioned automatic cleaning and drying equipment for zirconium balls. In the first material production process, a sand mill 100 is used to sand the first material, and the sand mill 100 is provided with a sand mill feed port and a sand mill discharge port. It can be understood that the sand mill feed port and the sand mill discharge port are independently set from the flushing end 101, the zirconium ball filling end 110 and the zirconium ball discharge end 120. The first material first enters the grinding chamber of the sand mill 100 through the sand mill feed port of the sand mill 100 for grinding. At this time, the flushing end 101, the zirconium ball filling end 110 and the zirconium ball discharge end 120 / discharge valve 130 are all in a closed state. After the first material is ground, it flows out from the sand mill discharge port and is introduced into the spray dryer 200 through the pump from the spray feed end 240 for spray drying to form a granular or powdered material. When the zirconium balls need to be cared for, the automatic cleaning and drying method for zirconium balls specifically includes the following steps:

[0080] The zirconium balls to be cleaned are taken out from the sand mill 100 and placed in the cleaning machine 300 for cleaning; the cleaned zirconium balls are placed in the drying box 400 for drying; the dried zirconium balls are placed back into the sanding chamber of the sand mill 100;

[0081] Among them, when the zirconium balls are being dried in the drying box 400, the humidity sensor 510 and the temperature sensor 550 monitor the air in the first loop 500 respectively. When the drying exhaust gas monitored by the humidity sensor 510 does not exceed the preset value, the heat energy of the drying exhaust gas is recovered and utilized through the first loop 500. When the humidity of the drying exhaust gas reaches the preset value, the water vapor in the drying exhaust gas is recovered through the condensation dehumidification heat exchange device 520, and the air heater adjusts the air temperature of the air inlet end 430 according to the temperature monitored by the temperature sensor 550.

[0082] Furthermore, the dry tail gas generated in the spray dryer 200 is introduced into the first loop 500 through the second induced draft fan 220 and the first solenoid valve 230. The dry tail gas enters the drying box 400 to realize heat recovery and utilization, and the dry tail gas passes through the condensation dehumidification heat exchange device 520 to realize water resource recovery and utilization. The dry tail gas can be introduced into the first loop 500 from between the condensation dehumidification heat exchange device 520 and the air heater 540, or from between the first tail gas discharge end 420 and the humidity sensor 510.

[0083] Furthermore, during the process of cleaning the zirconium balls in the cleaning machine 300, the cleaning water obtained after cleaning the zirconium balls is introduced into the spray feed end 240 of the spray dryer 200, and the cleaning water is spray-dried by the spray dryer 200, so as to recover the first material in the cleaning water. The utilization rate of the spray dryer 200 can be improved and the loss of the first material can be reduced.

[0084] Furthermore, during the process of cleaning the zirconium balls in the cleaning machine 300, the cleaning water used to clean the zirconium balls is introduced back into the cleaning machine 300 through the second loop 330 to repeatedly clean the zirconium balls. When the cleaning water reaches a certain degree of turbidity, the cleaning water is introduced into the spray dryer 200 to recover the first material, thereby saving cleaning water and, at the same time, improving the recovery efficiency of the spray dryer 200 for the cleaning water.

[0085] Furthermore, the water collected in the condensation dehumidification heat exchange device 520 is stored in the recovery water tank 600. The water in the recovery water tank 600 is introduced into the sanding chamber of the sand mill 100 to rinse the sanding chamber of the sand mill 100, and the water and zirconium balls for rinsing the sanding chamber are discharged into the cleaning machine 300. The water for rinsing the sanding chamber can be poured into the spray dryer 200 after passing through the cleaning machine 300 to further recover the first material. Thereby further reducing the loss of the first material. The water in the recovery water tank 600 can also be introduced into the cleaning machine 300 to clean the zirconium balls. Efficient use of water resources can save water consumption of the entire system.

[0086] Furthermore, after the sand mill 100 stops operating, the zirconium balls are directly discharged into the cleaning tank 350 of the cleaning machine 300 through the zirconium ball discharge end 120 for ultrasonic cleaning. After the cleaning, the zirconium balls are transported to the box 410 through the first carrier track 711, the first lifting device 721, the second carrier track 712 and the first pouring device 731 to complete the drying and screening process, and then the zirconium balls are backfilled from the zirconium ball filling end 110 into the sand mill 100 through the second lifting device 722, the third carrier track 713 and the second pouring device 732, thereby realizing the entire process of automatic care of the zirconium balls. In addition, the zirconium balls in the sand mill 100 are periodically washed and dried through program settings and then automatically loaded back into the sand mill 100, which reduces the loss of manpower, material resources and costs in the production process of lithium iron phosphate materials, reduces maintenance costs, and improves the work efficiency of the production line.

[0087] A partition 480 with a certain tilt angle is set in the box 410. The zirconium balls sent into the box 410 pass through the partition 480 structure and the collection plate 490 structure with multiple layers of upper and lower double-layer designs. During the rolling process of the zirconium balls, the zirconium balls with a width smaller than the first air hole 481 in the partition 480 fall into the collection plate 490 of the lower layer, thereby screening the zirconium balls of different sizes. The zirconium balls of qualified sizes flow to the lower partition 480 to continue the drying and screening process synchronously, and the specially designed guide track 482 of the partition 480 can make the zirconium balls dry for a longer time, avoiding the situation of insufficient drying caused by rapid falling. The zirconium balls with a size lower than the preset value fall into the collection plate 490 and finally fall into the ton bag 800. The zirconium balls of qualified sizes finally fall into the first drying discharge end 450 and are exported to the conveying end of the second lifting device 722, and finally automatically sent back to the sand mill 100, realizing the automatic filling of zirconium balls.

[0088] When the dry tail gas generated in the box 410 passes through the first loop 500, when the humidity exceeds the preset value, pure water is started to condense and heat the dry tail gas, and the moisture in the dry tail gas is recovered. The dry tail gas after heat exchange, the dry tail gas generated by the spray dryer 200, and the compressed air supply end 530 enter the air heater 540 together for regulation, and then enter the box 410 for recycling, so as to achieve heat recovery and reduce the energy consumption of the air heater 540. When the humidity does not exceed the preset value, the dry tail gas does not start the pure water and does not perform condensation treatment when passing through the condensation dehumidification heat exchange device 520, and the dry tail gas is directly recycled and used, making full use of the heat energy of the dry tail gas, thereby realizing the recycling and utilization of the heat energy of the dry tail gas and the efficient recycling and utilization of water resources. The generated water resources are stored in the recycling water tank 600 and reused in the sand milling chamber cleaning of the sand mill 100 and the zirconium ball cleaning of the cleaning machine 300, so as to achieve the effect of efficient recovery and full utilization of water resources, reduce the overall water consumption of the system, and save water resources.

[0089] The cleaning water generated by cleaning the zirconium balls in the cleaning machine 300 is reused in the cleaning of the zirconium balls through the second loop 330. The zirconium balls can be cleaned repeatedly for many times. After the cleaning water reaches a certain degree of turbidity, the cleaning water is introduced into the spray dryer 200 for spray drying, so as to recover the remaining first material therein and reduce the loss of the first material in the sand grinding process.

[0090] The dry tail gas generated after the spray drying treatment of the spray dryer 200 is connected to the first loop 500 as a heat source, and the air intake is adjusted by the first solenoid valve 230 and sent to the box 410 for use after passing through the air heater 540 to achieve heat recovery, and then form dry tail gas, and the heat energy and water resources of the dry tail gas are recovered, and recycled back into the system to maximize the use of tail gas resources. In addition, the continuous drying process of the zirconium balls in the box 410 can make the dry tail gas have greater stability, and the condensation dehumidification heat exchange device 520 can stably and periodically recycle water resources. Therefore, the various links of the entire system of the embodiment of the present application are closely linked and interdependent, and the benefits can be maximized.

[0091] The positive effects brought about by the automatic cleaning and drying system and method for zirconium balls of lithium iron phosphate sand mill disclosed in the embodiments of the present application include at least the following aspects:

[0092] 1. The washing and drying process of zirconium balls in the lithium iron phosphate sand grinding process can be automated.

[0093] 2. According to the zirconium ball wear, the zirconium balls of qualified size are automatically screened, the unqualified size zirconium balls are automatically discharged, and the zirconium balls of qualified size are automatically filled, reducing the time of manual screening and the waste of manual screening and scattering.

[0094] 3. Washing and drying zirconium balls can reduce the loss of zirconium balls caused by manual disassembly, cleaning, drying, and washing, reduce the maintenance cost of zirconium balls, reduce maintenance time, and improve production line utilization.

[0095] 4. For the washing and drying of zirconium balls, the residual materials of the washing water are recovered, and the water in the drying tail gas is recycled and reused to reduce energy consumption;

[0096] 5. Utilize the drying heat source, and use the calorific value of the drying exhaust gas generated by the spray drying process in the next process to work together with the heat source of the drying box 400 in this process, so as to reduce the heat energy consumption of the drying box 400 and continuously reduce the cost of energy use.

[0097] 6. For drying and recovering tail gas, reduce heat energy consumption and recycle the moisture in the drying tail gas under preset conditions through the condensation dehumidification heat exchange device 520. The heat energy of the heat exchange is then output to the air heater 540 to recover heat energy, thereby continuously reducing the cost of energy use.

[0098] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. An automatic cleaning and drying system for zirconium balls in a lithium iron phosphate sand mill, used for washing and drying zirconium balls in a sand mill (100), characterized in that: The automatic cleaning and drying system comprises: A cleaning machine (300) for cleaning zirconium balls; A drying box (400) is used to dry the cleaned zirconium balls. The drying box (400) is provided with a first exhaust gas discharge end (420) at the top and an air inlet end (430) at the bottom. A first circuit (500) is connected between the first exhaust gas discharge end (420) and the air inlet end (430). The first circuit (500) includes a condensation dehumidification heat exchange device (520) and an air heater (540) which are sequentially connected to the first exhaust gas discharge end (420). A humidity sensor (510) is provided between the first exhaust gas discharge end (420) and the condensation dehumidification heat exchange device (520). A compressed air supply end (530) is connected between the condensation dehumidification heat exchange device (520) and the air heater (540). A The drying exhaust gas generated by the drying box (400) passes through the first exhaust gas discharge end (420), the humidity sensor (510), the condensation dehumidification heat exchange device (520), the air heater (540), the temperature sensor (550) and the air inlet end (430) in sequence, and then returns to the drying box (400) for recycling. When the humidity of the drying exhaust gas monitored by the humidity sensor (510) exceeds a preset value, the condensation dehumidification heat exchange device (520) is started to condense and heat the drying exhaust gas to recover the moisture in the drying exhaust gas. The air heater (540) adjusts the air temperature of the air inlet end (430) according to the temperature measured by the temperature sensor (550). The first circuit (500) is also connected to a first induced draft fan (560) for guiding air.

2. According to claim 1, an automatic cleaning and drying system for zirconium balls of a lithium iron phosphate sand mill is characterized in that: The sand mill (100) is used for sand milling in a first material production process, and the first material production process also includes using a spray dryer (200) to spray dry the sand-milled first material; the spray dryer (200) is provided with a second exhaust gas discharge end (210), the second exhaust gas discharge end (210) is connected between the condensation dehumidification heat exchange device (520) and the air heater (540) or between the first exhaust gas discharge end (420) and the humidity sensor (510), and the second exhaust gas discharge end (210) is installed with a second induced draft fan (220) for guiding air and a first solenoid valve (230) for adjusting the air intake volume. The dry exhaust gas generated by the spray dryer (200) passes through the second induced draft fan (220) and the first solenoid valve (230) and enters the first circuit (500) for recycling.

3. The automatic cleaning and drying system for zirconium balls of a lithium iron phosphate sand mill according to claim 1 or 2, characterized in that: The sand mill (100) is used for sand milling in a first material production process, and the first material production process also includes using a spray dryer (200) to spray dry the first material after sand milling, and the spray dryer (200) is provided with a spray feed end (240) for feeding the first material; the cleaning machine (300) is provided with a drainage end (310), and the drainage end (310) is used to discharge cleaning water after cleaning zirconium balls, and the drainage end (310) is connected to the spray feed end (240).

4. According to claim 3, an automatic cleaning and drying system for zirconium balls of a lithium iron phosphate sand mill is characterized in that: The cleaning machine (300) is provided with a water inlet (320) for introducing cleaning water, a second circuit (330) for recycling cleaning water is connected between the water inlet (320) and the drainage end (310), the second circuit (330) is provided with a first water pump (331) and a second electromagnetic valve (332) in sequence from the drainage end (310), the spray feed end (240) is connected to the second electromagnetic valve (332), and when the cleaning water reaches a preset condition, the second electromagnetic valve (332) guides the cleaning water into the spray feed end (240).

5. The automatic cleaning and drying system for zirconium balls of lithium iron phosphate sand mill according to claim 1, characterized in that: It also includes a recovery water tank (600), wherein the condensation dehumidification heat exchange device (520) collects moisture in the drying exhaust gas and stores it in the recovery water tank (600), the recovery water tank (600) is provided with a water outlet (601), the sand mill (100) is provided with a flushing end (101) connected to the sand milling chamber, the cleaning machine (300) is provided with a water inlet (320) for introducing cleaning water, the water outlet (601) is connected to the water inlet (320) and / or the flushing end (101), and the water outlet (601) is installed with a third solenoid valve (602) for controlling the water output of the recovery water tank (600) and a third water pump (603) for conveying water.

6. The automatic cleaning and drying system for zirconium balls of lithium iron phosphate sand mill according to claim 1, characterized in that: The drying box (400) comprises: A box body (410) is provided with a drying material input end (440) for inputting materials at the top and a first drying material output end (450) for outputting materials at the bottom, the first tail gas discharge end (420) is provided at the top of the box body (410), and the air inlet end (430) is provided at the bottom of the box body (410); The partition mesh group (470) includes more than two partition meshes (480), wherein the partition meshes (480) are installed obliquely in the box body (410), and the partition meshes (480) are formed with a first air vent (481). Two adjacent partition meshes (480) are spaced apart in the longitudinal direction and arranged in opposite oblique directions, and when the zirconium ball falls from the lower end position of the partition mesh (480) at the top, it can fall to the higher end position of the adjacent partition mesh (480) at the bottom. The zirconium ball enters the box body (410) from the drying feed end (440) and falls on the higher end position of the partition mesh (480) at the top. The zirconium ball is dried in turn in the process of all the partition meshes (480) rolling down. After the zirconium ball rolls to the lower end position of the partition mesh (480) group at the bottom, it is discharged from the first drying discharge end (450) to the outside of the box body (410).

7. The automatic cleaning and drying system for zirconium balls of lithium iron phosphate sand mill according to claim 6, characterized in that: The width of the first air vent (481) in a direction perpendicular to the rolling direction of the zirconium balls is limited to a preset value, so that when the zirconium balls roll down the partition (480), the zirconium balls with a diameter less than or equal to the preset value pass through the first air vent (481) to achieve screening. A plurality of collecting plates (490) are also obliquely installed in the box (410), the number of the collecting plates (490) being equal to the number of the partitions (480), and one of the collecting plates (490) is distributed under each of the partitions (480). 490), the box body (410) is respectively provided with a second drying discharge end (460) for discharging materials at a position corresponding to the lower end of each collecting plate (490), and the zirconium balls sieved by the partition net (480) fall onto the collecting plate (490) below, and the zirconium balls on the collecting plate (490) roll to the lower end of the collecting plate (490) due to gravity, and are then discharged from the second drying discharge end (460) to the outside of the box body.

8. The automatic cleaning and drying system for zirconium balls of a lithium iron phosphate sand mill according to claim 6 or 7, characterized in that: The top surface of the partition (480) is formed with a plurality of guide tracks (482) arranged side by side and used for the zirconium balls to roll. The guide tracks (482) are bent in sequence along the two sides at intervals to form a plurality of inclined sections (483) and turning sections (484). The turning section (484) is used to connect two adjacent inclined sections (483). On the inclined plane where the partition (480) is located, an angle α greater than 0 and less than or equal to 90 degrees is formed between the length direction of the inclined section (483) and the downward inclined direction of the partition (480), so that the zirconium balls have a lateral displacement component when sliding down along the guide tracks (482). The first air vent (481) is arranged at the bottom of the guide track (482). When the angle α is equal to 90 degrees, the bottom wall of the inclined section (483) is arranged to be inclined downward along the rolling direction of the zirconium balls.

9. The automatic cleaning and drying system for zirconium balls of a lithium iron phosphate sand mill according to claim 6, characterized in that: The invention also comprises a transport unit (700), wherein the transport unit (700) comprises a horizontal transport track, a lifting device and a flipping and unloading device. The zirconium balls cleaned by the cleaning machine (300) are transferred to the top of the drying feeding end (440) through the horizontal transport track and the lifting device, and then the zirconium balls are poured from the drying feeding end (440) into the box (410) for drying through the flipping and unloading device. The sand mill (100) is provided with a zirconium ball filling end (110) for placing the zirconium balls. The finished zirconium balls are transferred to the top of the zirconium ball filling end (110) through the horizontal transport track and the lifting device, and the zirconium balls are poured from the zirconium ball filling end (110) into the sand mill (100) through the flipping and pouring device. The sand mill (100) is provided with a zirconium ball discharge end (120) for discharging the zirconium balls, and the cleaning machine (300) is provided with a cleaning feed end (340) for placing the zirconium balls. The zirconium ball discharge end (120) is connected to the cleaning feed end (340) and is equipped with a discharge valve (130).

10. A method for automatically cleaning and drying zirconium balls for lithium iron phosphate sand mill, characterized in that: The zirconium balls are cleaned and dried by using the automatic cleaning and drying system for zirconium balls in a lithium iron phosphate sand mill as described in any one of claims 1 to 9. The automatic cleaning and drying method for zirconium balls comprises the following steps: The zirconium balls to be cleaned are taken out from the sand mill (100) and placed in the cleaning machine (300) for cleaning; Putting the cleaned zirconium balls into the drying box (400) for drying; Putting the dried zirconium balls back into the sand milling chamber of the sand mill (100); In which, while the zirconium balls are being dried in the drying box (400), the humidity sensor (510) and the temperature sensor (550) respectively monitor the air in the first circuit (500); when the drying exhaust gas monitored by the humidity sensor (510) does not exceed a preset value, the heat energy of the drying exhaust gas is recovered and utilized through the first circuit (500); when the humidity of the drying exhaust gas reaches a preset value, the water vapor in the drying exhaust gas is recovered through the condensation dehumidification heat exchange device (520); and the air heater adjusts the air temperature at the air inlet end (430) according to the temperature monitored by the temperature sensor (550).

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