CN111841383B

CN111841383B - Negative electrode material production equipment

Info

Publication number: CN111841383B
Application number: CN201910344072.0A
Authority: CN
Inventors: 郭志强; 王芸; 温严; 韩阳; 杜先东
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2019-04-26
Filing date: 2019-04-26
Publication date: 2022-07-12
Anticipated expiration: 2039-04-26
Also published as: CN111841383A

Abstract

The invention relates to a negative electrode material production device, which comprises: the system comprises a dispersion tank, a drying device, a first buffer storage bin, an additive feeding bin and a rotary furnace; a dispersion tank for receiving and mixing the feedstock, the first additive, and the solvent to form a slurry; the drying device is arranged at the downstream of the dispersion tank and is used for receiving the slurry, drying the slurry and granulating the slurry to form powder; the first cache bin is connected with the drying device to receive cache powder; the first buffer storage bin and the additive feeding bin are respectively connected to the rotary furnace and arranged at the upstream of the rotary furnace, and are respectively used for feeding powder and a second additive to the rotary furnace; the rotary kiln is used for receiving the powder and the second additive, mixing the second additive and the powder, and sintering to form a product. The production equipment of the negative electrode material can save the time of a material mixing process, reduce the processing processes, improve the production efficiency and produce the negative electrode material with high quality.

Description

Negative electrode material production equipment

Technical Field

The invention relates to the technical field of batteries, in particular to a production device of a negative electrode material.

Background

With the development of science and technology, secondary batteries are widely used in the fields of mobile electronics, new energy electric vehicles, large-scale energy storage devices and the like. In order to increase the energy density of the secondary battery, it is necessary to start with both structural design of the secondary battery and development of new materials. The development of new materials mainly aims at developing anode materials with higher capacity. The traditional production of the cathode material is basically a technological route of dispersing, drying, mixing, pot-filling, sintering, crushing and the like, and has complex working procedures and longer production period. And in the sagger sintering process, a sagger is adopted for sintering operation, and in the sintering process, because inner layer materials in the sagger are difficult to contact with the atmosphere, the heating is uneven, so that the properties of the materials in different positions in the same batch are different, and the properties of the produced negative electrode material are reduced.

Disclosure of Invention

The embodiment of the invention provides anode material production equipment, which can save the time of a material mixing process, reduce the processing processes and improve the production efficiency, and the produced anode material product has high quality.

The embodiment of the invention provides anode material production equipment, which comprises:

the system comprises a dispersion tank, a drying device, a first buffer storage bin, an additive feeding bin and a rotary furnace; a dispersion tank for receiving and mixing the feedstock, the first additive, and the solvent to form a slurry; the drying device is arranged at the downstream of the dispersion tank and is used for receiving the slurry, drying the slurry and granulating the slurry to form powder; the first cache bin is connected with the drying device to receive cache powder; the first buffer storage bin and the additive feeding bin are respectively connected to the rotary furnace and arranged at the upstream of the rotary furnace, and are respectively used for feeding powder and a second additive to the rotary furnace; the rotary kiln is used for receiving the powder and the second additive, mixing the second additive and the powder, and sintering to form a product.

The anode material production equipment according to the embodiment comprises a dispersion tank, a drying device, a first buffer storage bin, an additive feeding bin and a rotary furnace. The dispersion tank of this example can disperse materials such as solvent and raw materials and mix to form the thick liquids. And drying the uniformly mixed slurry by using a drying device to form powder. The rotary furnace has larger volume, reduces the limit of the volume on the production yield of the cathode material and improves the production yield. Furnace body can slow rotation in the rotary furnace sintering process to add into the material of self inside through first buffer memory feed bin and additive batch feed bin and carry out compounding and/or breakage, thereby save the crushing process after the compounding process before going into the stove and the traditional handicraft ejection of compact, simplify manufacturing procedure, improve production efficiency. The furnace body can slowly rotate at a uniform speed in the sintering process of the rotary furnace, so that materials are heated more uniformly in the sintering process, and the performance of the produced cathode material is optimized. The first buffer storage bin and the additive feeding bin are used for feeding materials into the rotary furnace respectively, so that automation of a material feeding process is easy to achieve, and remote control is facilitated. The first buffer storage bin and the additive feeding bin are used for feeding materials into the rotary furnace respectively, so that the possibility of pollution of the materials stored in the first buffer storage bin and the additive feeding bin can be reduced, and the feeding amount of the materials can be controlled.

Drawings

Features, advantages and technical effects of exemplary embodiments of the present invention will be described below by referring to the accompanying drawings.

Fig. 1 is a schematic structural view of an anode material production apparatus according to an embodiment of the present invention;

fig. 2 is a schematic structural view of an anode material production apparatus of another embodiment of the present invention;

fig. 3 is a schematic structural view of an anode material production apparatus according to still another embodiment of the present invention.

In the drawings, the drawings are not necessarily to scale.

Description of the labeling:

10. a negative electrode material production facility; 11. a dispersion tank; 111. an additive feeding port; 12. a drying device; 121. a centrifugal atomization drying tower; 122. a cyclone separator; 123. a dust remover; 124. a transfer bin; 13. a first cache bin; 14. an additive feeding bin; 141. an additive storage tank; 15. a rotary kiln; 16. a first screw gauge; 17. a second screw gauge; 18. a first heat insulation device; 19. a second thermal insulation means; 20. a first tail gas treatment device; 21. a second cache bin; 22. a third heat insulation device; 23. a third screw gauge; 24. a screening component; 25. an iron removal component; 26. a closed loop pneumatic conveying device; 261. a nitrogen source; 262. a Roots blower; 263. a filter; 264. a cooler; 265. a combustible gas detector; 266. an oxygen concentration detector; 27. feeding raw materials into a bin; 28. a solvent metering tank; 29. a delivery line; 30. a slurry circulation line; 31. a first valve; 32. cleaning a pipeline; 33. a second valve; 34. a first diaphragm pump; 35. a second diaphragm pump; 36. a second tail gas treatment device; 37. a solvent storage tank; 38. a packaging machine; 39. a bin top filter; 40. and cooling the storage bin.

Detailed Description

The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the invention and are not intended to limit the scope of the invention, i.e., the invention is not limited to the described embodiments.

In the description of the present invention, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front," "rear," "leading," "trailing," and the like, as used herein, refer to an orientation or positional relationship indicated for convenience and simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The following description is given with the directional terms as viewed in the drawings and not intended to limit the invention to the specific structure shown in the drawings. In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.

For a better understanding of the present invention, embodiments of the present invention are described in detail below with reference to fig. 1 to 3.

In one embodiment, referring to fig. 1, the anode material production apparatus 10 includes a dispersion tank 11, a drying device 12 disposed downstream of the dispersion tank 11, a first buffer bin 13 disposed downstream of the drying device 12, a rotary kiln 15 disposed downstream of the first buffer bin 13, and an additive feed bin 14 disposed upstream of the rotary kiln 15.

The dispersion tank 11 of the present embodiment is used to receive and mix the raw material, the first additive, and the solvent to form a slurry. The dispersion tank 11 makes the material flow in a ring shape by the high-speed operation of the dispersion disc arranged inside, generates a strong vortex and falls to the bottom of the vortex in a spiral shape, so that strong shearing impact and friction are generated, and the functions of rapid dispersion, uniform mixing and the like are achieved. The drying device 12 is used for receiving the slurry and drying and granulating the slurry to form powder. The first buffer bin 13 is connected to the drying device 12 to receive the buffer powder. The first buffer storage bin 13 and the additive feeding bin 14 are used for feeding powder and a second additive to the rotary kiln 15 respectively. The rotary kiln 15 is used for receiving the powder and the second additive, mixing the second additive and the powder, and sintering to form a product. The product is usually sieved, demagnetized or packaged to form the final product.

The anode material production apparatus 10 of the present embodiment includes a dispersion tank 11, a drying device 12, a first buffer storage bin 13, an additive charging bin 14, and a rotary kiln 15. The dispersion tank 11 of this embodiment can uniformly disperse materials such as a solvent and a raw material to form a slurry. The drying device 12 dries the uniformly mixed slurry to form powder. The rotary furnace 15 has larger volume, so that the limitation of the volume on the production yield of the cathode material is reduced, and the production yield is improved. The furnace body can rotate slowly in the 15 sintering processes of rotary furnace to add into the material of self inside through first buffer storage feed bin 13 and additive throw feed bin 14 and carry out compounding and/or breakage, thereby save the compounding process before going into the stove and the broken process after the traditional handicraft ejection of compact, simplify manufacturing procedure, improve production efficiency. The furnace body can slowly rotate at a constant speed in the sintering process of the rotary furnace 15, so that the materials are heated more uniformly in the sintering process, and the performance of the produced cathode material is optimized. The first buffer storage bin 13 and the additive feeding bin 14 respectively feed materials into the rotary furnace 15, so that automation of the material feeding process is easy to realize, and remote control is facilitated. The first buffer storage bin 13 and the additive feeding bin 14 are used for feeding materials into the rotary furnace 15 respectively, so that the possibility of pollution of the materials stored in the first buffer storage bin and the additive feeding bin can be reduced, and the control of the feeding amount of the materials can be facilitated.

In one embodiment, the anode material production apparatus 10 further includes a first screw gage 16 and a second screw gage 17. A first screw meter 16 is arranged between the first buffer silo 13 and the rotary kiln 15. A second screw meter 17 is arranged between the additive dosing bin 14 and the rotary kiln 15. The powder stored in the first buffer silo 13 can be weighed by the first screw meter 16 and then quantitatively fed into the rotary kiln 15, and the additive stored in the additive feed silo 14 can be weighed by the second screw meter 17 and then quantitatively fed into the rotary kiln 15. Like this, can control the material input volume of first buffer memory feed bin 13 and additive input feed bin 14 in to rotary furnace 15 accurately, improve material input volume precision, be favorable to improving the processing product quality, also reduce the extravagant possibility of material simultaneously.

During operation of the anode material drying device, the first buffer bin 13 and the additive feeding bin 14 may vibrate themselves. If the first screw meter 16 and the second screw meter 17 are not provided, when the first buffer silo 13 and the additive feeding silo 14 feed materials into the rotary kiln 15, the powder and the additive may be vibrated and fall too fast due to the vibration of the first buffer silo 13 and the additive feeding silo 14, thereby resulting in a large feeding amount. In the embodiment where the first screw meter 16 and the second screw meter 17 are provided, the process of placing the material by the first screw meter 16 and the second screw meter 17 is not affected by vibration, thereby effectively ensuring the accuracy of the material placing amount by the first buffer silo 13 and the additive placing silo 14.

In one embodiment, the anode material production apparatus 10 further includes a first heat insulating device 18 and a second heat insulating device 19. The first heat insulation device 18 is arranged between the first buffer storage bin 13 and the rotary kiln 15. A second heat insulation device 19 is arranged between the additive charging bin 14 and the rotary kiln 15. When the rotary kiln 15 is operated, it is in a high temperature state. First buffer memory feed bin 13 and additive throw feed bin 14 can be kept apart with rotary furnace 15 through first heat-proof device 18 and second heat-proof device 19 respectively, effectively prevents rotary furnace 15's heat to first buffer memory feed bin 13 and additive throw feed bin 14 conduction to reduce first buffer memory feed bin 13 and additive and throw feed bin 14 self temperature on the high side and lead to the possibility that the material of inside storage takes place to deteriorate or adverse reaction, and then be favorable to guaranteeing the quality reliability and the stability of the negative pole material who obtains. Optionally, the first and second thermal insulation means 18, 19 each comprise a heat resistant member of a heat resistant material.

In one embodiment, referring to fig. 2, the anode material production apparatus 10 further includes a first tail gas treatment device 20. The rotary kiln 15 is connected to a first exhaust gas treatment device 20. The first tail gas treatment device 20 is used for receiving the sintering tail gas output by the rotary furnace 15 and purifying the sintering tail gas. During the sintering process of the rotary furnace 15, toxic and harmful gas impurities are generated in the rotary furnace 15. The gas impurities in the rotary furnace 15 can be conveyed to the first tail gas treatment device 20 for treatment and can be discharged after reaching the standard, so that the possibility of environmental pollution is reduced, and the environmental friendliness and safety of the anode material production equipment 10 are improved.

In one embodiment, the anode material production apparatus 10 further includes a third heat insulating device 22, a cooling bin 40, and a second buffer bin 21. A cooling silo 40 is disposed downstream of the rotary kiln 15 and is adapted to receive the product discharged from the rotary kiln 15 and to cool the product. Since the temperature of the product discharged from the rotary kiln 15 is high, the product is conveyed to the cooling silo 40 to be cooled. The cooling bin 40 is internally provided with a stirring blade. The stirring blade can stir the product to rapidly cool the product. The stirring blade may be a propeller blade. A second buffer bin 21 is arranged downstream of the cooling bin 40 for receiving the cooled product discharged from the cooling bin 40 and buffering the product. The sintered products are completely discharged to the cooling bin 40 and the second buffer storage bin 21 in the rotary furnace 15, and after the second buffer storage bin 21 is closed, the rotary furnace 15 can process the next batch of materials, so that the machine does not need to be stopped, and the production continuity is guaranteed. The third heat insulation device 22 is arranged between the rotary furnace 15 and the cooling bin 40, so that the possibility that the heat of the rotary furnace 15 is transferred to the cooling bin 40 and the second buffer bin 21 is reduced, and the possibility that the cooling effect of the cooling bin 40 and the second buffer bin 21 is poor due to the fact that the temperature of the cooling bin 40 and the second buffer bin 21 is higher. Optionally, the third thermal shield 22 includes a thermal barrier member made of a thermal barrier material.

In one embodiment, the negative electrode material production apparatus 10 further includes a third screw meter 23 connected to the second buffer bin 21, a sieving part 24, and an iron removing part 25. The outlet of the second buffer bin 21 is connected to a third screw meter 23. The second buffer storage bin 21 outputs the product after weighing and metering through a third screw meter 23. If not set up third screw counter 23, when second buffer memory feed bin 21 thrown the material to downstream screening part 24, because there is the condition of vibration second buffer memory feed bin 21 self, easily lead to the product to receive the vibration and drop too fast to lead to the input volume to be on a large scale, cause the influence to downstream screening part 24's screening performance. In the embodiment where the third screw meter 23 is provided, the third screw meter 23 is not affected by vibrations, thereby effectively ensuring the accuracy of the dosage of the second buffer bin 21. The product output from the second buffer storage bin 21 is screened by the screening component 24 to screen the negative electrode material with qualified particle size. Alternatively, the screen member 24 may be an ultrasonic vibration screen. Magnetic impurities in the product are removed through the iron removal component 25, and the purity of the cathode material is improved. Alternatively, the iron removing part 25 may be an electromagnetic iron remover. The anode material purified by the iron removing part 25 falls into a downstream packaging machine 38 for packaging.

In one embodiment, referring to fig. 2, the negative electrode material production apparatus 10 further includes a closed loop pneumatic conveying device 26. The outlet of the rotary kiln 15 is connected with the outlet of a closed-loop pneumatic conveying device 26. The second buffer silo 21 has a silo top filter 39. The top bin filter 39 is in communication with the inlet of the closed loop pneumatic conveyor 26. The closed-loop pneumatic conveying device 26 is used for providing gas for the cathode material production equipment 10 and providing pneumatic power with the gas as a carrier, so that materials in corresponding pipelines are blown, and material conveying is completed. The product output from the rotary kiln 15 can be conveyed to the second buffer silo 21 by gas input through the closed-loop pneumatic conveying device 26. The gas input by the closed-loop pneumatic conveying device 26 is finally output from the bin top filter 39. The gas after dust removal and purification by the bin top filter 39 is output and returned to the closed-loop pneumatic conveying device 26, so that the gas can be recycled, and the energy consumption is reduced. In the embodiment in which the anode material production apparatus 10 includes the cooling silo 40, the cooling silo 40 is connected to the outlet of the rotary kiln 15. The outlet of the cooling silo 40 is communicated with the outlet of the closed-loop pneumatic conveying device 26.

In one example, the closed loop pneumatic conveying device 26 includes a nitrogen source 261, a roots blower 262, a filter 263, a cooler 264, a combustible gas detector 265, and an oxygen concentration detector 266 connected. The Roots blower 262 delivers nitrogen from the nitrogen source 261 to the outlet of the closed-loop pneumatic conveying device 26. The closed-loop pneumatic conveying device 26 filters and cools the gas returning from the inlet of the closed-loop pneumatic conveying device 26 to the closed-loop pneumatic conveying device 26 through the filter 263 and the cooler 264, so as to ensure that the temperature of the returning nitrogen gas keeps a normal range and meets the required purity. The closed-loop pneumatic conveying device 26 detects the combustible gas concentration and the oxygen concentration in the gas flowing back to the closed-loop pneumatic conveying device 26 by the combustible gas detector 265 and the oxygen concentration detector 266. When the concentration of the combustible gas and the concentration of the oxygen reach the preset concentration threshold values, the nitrogen which circularly flows back to the closed-loop pneumatic conveying device 26 is discharged to the second tail gas treatment device 36, so that the safety of the circulating nitrogen is ensured, and the possibility of explosion is reduced. And finally, the anode material is purified by the second tail gas treatment device 36 and then is exhausted, so that the environmental protection performance of the anode material production equipment 10 is improved, and the tail gas is ensured to meet the environmental protection requirement.

In one embodiment, the anode material production apparatus 10 further includes a raw material charging bin 27 connected to the dispersion tank 11. The raw material charging bin 27 is used for charging raw materials into the dispersion tank 11. The raw material charging bin 27 stores raw materials in advance, and can charge the raw materials into the dispersion tank 11 in a fixed amount by a screw meter. Since the raw material charging bin 27 is used to charge the raw material into the dispersion tank 11, the raw material charging bin 27 can isolate the dispersion tank 11 from the external environment, thereby reducing the possibility that the dispersion tank 11 comes into contact with the external air. The convenience and accuracy of charging can be improved by charging the raw material into the dispersion tank 11 using the raw material charging bin 27. The dispersion tank 11 has an additive feed port 111. The additive feed port 111 is used to feed the first additive into the dispersion tank 11. Optionally, an additive feeding port 111 is provided at the top of the dispersion tank 11 to facilitate the feeding of the first additive from the top of the dispersion tank 11. The additive feeding port 111 comprises a funnel-shaped material storage member, a connecting pipeline connecting the material storage member and the dispersion tank 11, and a valve arranged on the connecting pipeline.

In one embodiment, anode material production facility 10 also includes solvent metering tank 28. A solvent metering tank 28 is provided upstream of the dispersion tank 11. The solvent metering tank 28 is used for supplying the dispersion solvent to the dispersion tank 11. The dispersion solvent is quantitatively metered by the solvent metering tank 28 and then conveyed into the dispersion tank 11, so that the accuracy of the solvent feeding amount is improved. In one example, solvent metering tank 28 and dispersion tank 11 are configured with level alarms and are interlocked with valves to stop feeding when the liquid level exceeds a predetermined threshold, facilitating accurate control of solvent metering tank 28 and dispersion tank 11. In one example, the anode material production apparatus 10 further includes a solvent tank 37. Solvent reservoir 37 is located upstream of solvent metering tank 28 and is connected by piping and valves. In one example, the number of dispersion tanks 11 is more than two, thereby achieving a redundant design, reducing the likelihood of downtime.

In one embodiment, referring to fig. 2 and 3, the anode material production apparatus 10 further includes a delivery line 29, a slurry circulation line 30, and a first valve 31. The dispersion tank 11 is connected to the drying device 12 through a transfer line 29. The slurry circulation line 30 communicates the delivery line 29 and the dispersion tank 11. The slurry circulation line 30 is controlled to be turned off or on by the first valve 31, or the pressure or flow rate of the slurry supplied to the drying device 12 is controlled by adjusting the opening degree of the first valve 31. When the first valve 31 is opened and the conveying pipeline stops conveying the slurry to the dispersing tank 11, the slurry can continuously and circularly flow in the dispersing tank 11 through the slurry circulating pipeline 30 and is not easy to deposit, so that the possibility that the slurry layering affects the dispersing effect and causes the performance of the material to be reduced is reduced, and the improvement of the quality of the finally obtained anode material is facilitated.

In one embodiment, the anode material production apparatus 10 further includes a purge line 32 and a second valve 33 that turns off or on the purge line 32. The solvent metering tank 28 is connected with the dispersion tank 11, the slurry circulation pipeline 30 and the drying device 12 through the cleaning pipeline 32, so that the dispersion tank 11, the slurry circulation pipeline 30 and/or the drying device 12 are cleaned through the cleaning pipeline 32, the respective internal cleanliness of the dispersion tank 11, the slurry circulation pipeline 30 and/or the drying device 12 is improved, and the possibility that powder is adhered to the respective internal portions of the dispersion tank 11, the slurry circulation pipeline 30 and/or the drying device 12 to influence the product quality or the normal operation of equipment is reduced. When the dispersion tank 11, the slurry circulation line 30 and/or the drying device 12 need to be cleaned, the solvent metering tank 28 stops feeding the solvent into the dispersion tank 11, the second valve 33 is opened, and the solvent metering tank 28 feeds the solvent into the cleaning line 32 and cleans the dispersion tank 11, the slurry circulation line 30 and/or the drying device 12.

In one embodiment, the anode material production apparatus 10 further includes a first diaphragm pump 34 and a second diaphragm pump 35. The inlet of the first diaphragm pump 34 is connected to the outlet of the solvent metering tank 28 for delivering the solvent to the interior of the dispersion tank 11. The inlet of the dispersion tank 11 and the inlet of the cleaning line 32 are connected to the outlet of the first diaphragm pump 34 so that the solvent can be pumped into the cleaning line 32 by the first diaphragm pump 34. The inlet of the second diaphragm pump 35 is connected to the outlet of the dispersion tank 11, and the outlet of the second diaphragm pump 35 is connected to the inlet of the drying device 12 and the inlet of the slurry circulation line 30, so as to pump the slurry uniformly mixed in the dispersion tank 11 into the drying device 12 or the slurry circulation line 30. The first diaphragm pump 34 and the second diaphragm pump 35 can stir the conveyed material to a small amount when providing conveying power for the material, so that the material performance stability is favorably ensured, and the product quality of the finally obtained anode material is improved.

In one embodiment, drying apparatus 12 includes a centrifugal spray drying tower, a cyclone, a dust separator, and a transfer bin. The centrifugal atomization drying tower, the cyclone separator and the dust remover are connected in series. The centrifugal atomization drying tower is disposed downstream of the dispersion tank 11. The centrifugal atomization drying tower can centrifugally atomize the slurry. The atomized spherical fog beads quickly evaporate the solvent in the high-temperature gas atmosphere in the centrifugal atomization drying tower, and are dried to form powder. The cyclone separator is arranged at the downstream of the centrifugal atomization drying tower and is used for receiving the powder discharged by the centrifugal atomization drying tower. The cyclone separator can be used for screening the powder and discharging qualified powder. Unqualified powder screened by the cyclone separator enters the dust remover and is captured and filtered by the dust remover. The transfer bin is arranged at the downstream of the cyclone separator. The first buffer bin 13 is disposed downstream of the transfer bin. In one example, the anode material production apparatus 10 further includes a closed loop pneumatic transport device 26. The outlet of the cyclone separator, the outlet of the transfer bin and the outlet of the rotary kiln 15 are respectively communicated with the outlet of a closed-loop pneumatic conveying device 26. Both the transit silo and the first cache silo 13 have a silo top filter 39. The top bin filter 39 is in communication with the inlet of the closed loop pneumatic conveyor 26. The powder discharged from the cyclone separator is conveyed to a transfer bin under the pushing action of gas input by a closed-loop pneumatic conveying device 26. The transfer feed bin can temporarily buffer powder. After the first buffer storage bin 13 puts the powder inside the first buffer storage bin into the rotary furnace 15, the powder in the transfer storage bin is conveyed to the first buffer storage bin 13 under the action of gas pushing input by the closed-loop pneumatic conveying device 26, so that the next batch of powder from the cyclone separator can be received by the transfer storage bin, the production continuity is favorably ensured, and the production efficiency is improved. The gas after dust removal and purification by the bin top filter 39 is output to the bin top filter 39 and flows back to the closed-loop pneumatic conveying device 26 to be recycled, so that energy consumption is saved.

In one embodiment, the dust separator and the closed-loop pneumatic conveying device 26 are both connected to a second tail gas treatment device 36. The second tail gas treatment device 36 is used for receiving and purifying the tail gas discharged by the dust remover and the closed-loop pneumatic conveying device 26. The exhaust gas is purified by the second exhaust gas treatment device 36 and then evacuated.

In one embodiment, the anode material production apparatus 10 further includes a dust removing device. The dust removing device can intensively filter and collect flying dust generated in the operation of the raw material feeding bin 27 and the additive feeding port 111 in the negative electrode material production equipment 10, prevent flying dust from escaping, and reduce the pollution of the flying dust to the working environment.

It should be noted that, in the embodiments of the present invention, the terms "upstream" and "downstream" refer to the order of material production, and do not limit the spatial positions of the components.

The negative electrode material production equipment 10 provided by the embodiment of the invention can save the material mixing process time, reduce the processing processes, improve the production efficiency and produce a negative electrode material product with high quality.

While the invention has been described with reference to a preferred embodiment, various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention, and particularly, features shown in the various embodiments may be combined in any suitable manner without departing from the scope of the invention. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims

1. An anode material production apparatus comprising:

dispersing tank, drying device, first buffer storage bin, additive feeding bin, rotary furnace and closed-loop pneumatic conveying device

The dispersion tank is to receive and mix a feedstock, a first additive, and a solvent to form a slurry; the drying device is arranged at the downstream of the dispersion tank and is used for receiving the slurry and drying and granulating the slurry to form powder; the first cache bin is connected with the drying device to receive and cache the powder; the first buffer storage bin and the additive feeding bin are respectively connected to the rotary furnace and arranged at the upstream of the rotary furnace, and are respectively used for feeding the powder and the second additive into the rotary furnace; the rotary furnace is used for receiving the powder and the second additive, mixing and sintering the second additive and the powder to form a product; the drying device comprises a centrifugal atomization drying tower, a cyclone separator and a transfer bin, the centrifugal atomization drying tower, the cyclone separator, the transfer bin and the first cache bin are sequentially connected in series, and the transfer bin is used for caching the powder formed by processing the slurry by the centrifugal atomization drying tower and the cyclone separator; the outlet of the cyclone separator and the outlet of the transfer bin are respectively communicated with the outlet of the closed-loop pneumatic conveying device, the transfer bin and the first buffer bin are respectively provided with a bin top filter, the bin top filter is communicated with the inlet of the closed-loop pneumatic conveying device, the closed-loop pneumatic conveying device is used for conveying the powder output by the cyclone separator to the transfer bin, conveying the powder output by the transfer bin to the first buffer bin, and the gas output by the bin top filter flows back to the closed-loop pneumatic conveying device.

2. The anode material production apparatus according to claim 1, further comprising a first screw meter and a second screw meter, the first screw meter being disposed between the first buffer bin and the rotary kiln, the second screw meter being disposed between the additive charging bin and the rotary kiln.

3. The anode material production facility according to claim 1, further comprising a first heat insulating device and a second heat insulating device, wherein the first heat insulating device is disposed between the first buffer bin and the rotary kiln, and the second heat insulating device is disposed between the additive charging bin and the rotary kiln.

4. The anode material production equipment according to claim 1, further comprising a first tail gas treatment device, wherein the rotary kiln is connected to the first tail gas treatment device, and the first tail gas treatment device is configured to receive sintering tail gas output by the rotary kiln and purify the sintering tail gas.

5. The anode material production apparatus according to claim 1, further comprising a second buffer bin disposed downstream of the rotary furnace and configured to receive and buffer the product, and a third heat insulation device disposed between the rotary furnace and the second buffer bin.

6. The anode material production equipment according to claim 5, further comprising a third screw meter, a screening component and an iron removal component connected to the second buffer bin, wherein an outlet of the second buffer bin is connected to the third screw meter, the second buffer bin outputs the product through the third screw meter, the product output from the second buffer bin is screened through the screening component, and magnetic impurities in the product are removed through the iron removal component.

7. The anode material production apparatus according to claim 5, wherein an outlet of the rotary kiln is in communication with an outlet of the closed-loop pneumatic conveying device, the second buffer storage bin has a bin top filter in communication with an inlet of the closed-loop pneumatic conveying device, the closed-loop pneumatic conveying device is configured to convey the product output from the rotary kiln to the second buffer storage bin, and gas output from the bin top filter flows back to the closed-loop pneumatic conveying device.

8. The anode material production facility according to claim 1, further comprising a raw material feed bin connected to the dispersion tank, wherein the dispersion tank has an additive feed port, the raw material feed bin is configured to feed the raw material into the dispersion tank, and the additive feed port is configured to feed the first additive into the dispersion tank.

9. The anode material production apparatus according to claim 1, further comprising a solvent metering tank provided upstream of the dispersion tank, the solvent metering tank being configured to convey the solvent to the dispersion tank.

10. The anode material production apparatus according to claim 9, further comprising a delivery line, a slurry circulation line, and a first valve, wherein the dispersion tank is connected to the drying device through the delivery line, the slurry circulation line communicates the delivery line and the dispersion tank, the slurry can flow back into the dispersion tank through the slurry circulation line, and the first valve controls the slurry circulation line to be turned off or on.

11. The anode material production apparatus according to claim 10, further comprising a purge line through which the solvent metering tank is connected to the dispersion tank, the slurry circulation line, and the drying device, and a second valve that closes or opens the purge line, to purge the dispersion tank, the slurry circulation line, and/or the drying device through the purge line.

12. The anode material production apparatus according to claim 11, further comprising a first diaphragm pump and a second diaphragm pump, wherein an inlet of the first diaphragm pump is connected to an outlet of the solvent metering tank, an inlet of the dispersion tank and an inlet of the cleaning line are connected to an outlet of the first diaphragm pump, an inlet of the second diaphragm pump is connected to an outlet of the dispersion tank, and an outlet of the second diaphragm pump is connected to the drying device and the slurry circulation line.

13. The anode material production apparatus according to claim 1, wherein the drying device further includes a dust remover, and the cyclone and the dust remover are connected in series.

14. The anode material production equipment according to claim 13, further comprising a second tail gas treatment device, wherein the dust remover and the closed-loop pneumatic conveying device are both connected to the second tail gas treatment device, and the second tail gas treatment device is configured to receive and purify the tail gas discharged by the dust remover and the closed-loop pneumatic conveying device.

15. The anode material production apparatus according to claim 1, wherein the closed-loop pneumatic conveying device includes a connected nitrogen gas source, a roots blower, a filter, a cooler, a combustible gas detector, and an oxygen concentration detector, the roots blower conveys nitrogen gas output from the nitrogen gas source to an outlet of the closed-loop pneumatic conveying device, the closed-loop pneumatic conveying device filters and cools gas flowing back from an inlet of the closed-loop pneumatic conveying device to the closed-loop pneumatic conveying device through the filter and the cooler, and the closed-loop pneumatic conveying device detects the combustible gas and the oxygen concentration in the gas flowing back to the closed-loop pneumatic conveying device through the combustible gas detector and the oxygen concentration detector.