CN111841383B - Negative electrode material production equipment - Google Patents

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

Anode material production equipment

technical field

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

Background technique

With the development of science and technology, secondary batteries have been widely used in the field of mobile electronics, new energy electric vehicles and large-scale energy storage equipment. In order to improve the energy density of secondary batteries, it is necessary to proceed from two aspects of secondary battery structure design and new material development. The development of new materials is mainly to develop anode materials with higher capacity. The production of traditional negative electrode materials is basically a process route such as dispersion, drying, mixing, potting and sintering, and crushing. The process is complicated and the production cycle is long. In the sintering process, the saggar is used for the sintering operation. During the sintering process, the inner layer material in the saggar is difficult to contact the atmosphere, resulting in uneven heating, which makes the properties of the materials in different positions of the same batch vary. will decrease.

SUMMARY OF THE INVENTION

The embodiment of the present invention provides a negative electrode material production equipment, which can save time in a mixing process, reduce processing steps, improve production efficiency, and produce high quality negative electrode material products.

The embodiment of the present invention proposes a negative electrode material production equipment, including:

Dispersing tank, drying device, first buffer silo, additive feeding silo and rotary kiln; dispersing tank is used for receiving and mixing raw material, first additive and solvent to form slurry; drying device is arranged downstream of dispersing tank, drying device uses receiving slurry and drying and granulating the slurry to form powder; the first buffer silo is connected with the drying device to receive the buffer powder; the first buffer silo and the additive feeding silo are respectively connected to the rotary kiln and arranged in Upstream of the rotary kiln, the first buffer silo and the additive feeding silo are used to feed powder and the second additive to the rotary kiln respectively; the rotary kiln is used to receive the powder and the second additive and mix and sinter the second additive and the powder. to form a product.

The negative electrode material production equipment according to the present embodiment includes a dispersion tank, a drying device, a first buffer silo, an additive feeding silo, and a rotary kiln. The dispersing tank of this embodiment can disperse and mix materials such as solvent and raw materials to form slurry. The drying device dries the mixed slurry and forms powder. The rotary furnace itself has a large volume, which reduces the limitation of the volume on the production output of negative electrode materials and increases the production output. During the sintering process of the rotary kiln, the furnace body can rotate slowly to mix and/or crush the materials added to itself through the first buffer silo and the additive feeding silo, thereby eliminating the need for the mixing process and traditional processes before entering the furnace. The crushing process after discharging simplifies the processing process and improves the production efficiency. During the sintering process of the rotary furnace, the furnace body can be rotated slowly and uniformly, so that the material is heated more evenly during the sintering process, and the performance of the negative electrode material produced is optimized. The first buffer silo and the additive feeding silo respectively put materials into the rotary furnace, so that it is easy to realize the automation of the material feeding process and facilitate remote control. The first buffer silo and the additive feeding silo are respectively used to put materials into the rotary kiln, which can reduce the possibility of contamination between the stored materials, and at the same time can help to control the amount of materials to be put in.

Description of drawings

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

1 is a schematic structural diagram of a negative electrode material production equipment according to an embodiment of the present invention;

2 is a schematic structural diagram of a negative electrode material production equipment according to another embodiment of the present invention;

3 is a schematic structural diagram of a negative electrode material production equipment according to another embodiment of the present invention.

In the drawings, the figures are not drawn to actual scale.

Tag Description:

10. Negative material production equipment; 11. Dispersion tank; 111. Additive feeding port; 12. Drying device; 121. Centrifugal atomization drying tower; 122. Cyclone separator; 123. Dust collector; 124. Transfer bin; 13, 1st buffer storage bin; 14, additive feeding bin; 141, additive storage tank; 15, rotary kiln; 16, first screw meter; 17, second screw meter; 18, first heat insulation device; 19, first 2. Thermal insulation device; 20. The first exhaust gas treatment device; 21. The second buffer silo; 22. The third thermal insulation device; 23. The third screw meter; 24. The screening part; , closed-loop pneumatic conveying device; 261, nitrogen gas source; 262, roots blower; 263, filter; 264, cooler; 265, combustible gas detector; 266, oxygen concentration detector; 27, raw material feeding bin; 28 , solvent metering tank; 29, conveying pipeline; 30, slurry circulation pipeline; 31, first valve; 32, cleaning pipeline; 33, second valve; 34, first diaphragm pump; 35, second diaphragm pump 36, the second exhaust gas treatment device; 37, the solvent storage tank; 38, the packaging machine; 39, the top filter; 40, the cooling silo.

Detailed ways

The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the invention by way of example, but not to limit the scope of the invention, that is, the invention is not limited to the described embodiments.

In the description of the present invention, it should be noted that, unless otherwise specified, "plurality" means more than two; the terms "upper", "lower", "left", "right", "inner", " The orientation or positional relationship indicated by "outside", "front end", "rear end", "head", "tail", etc. are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the indicated device or element must be It has a specific orientation, is constructed and operates in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first," "second," "third," etc. are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

The orientation words appearing in the following description are all the directions shown in the drawings, and do not limit the specific structure of the present invention. In the description of the present invention, it should also be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a connectable connection. Detachable connection, or integral connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific conditions.

In order to better understand the present invention, the embodiments of the present invention are described in detail below with reference to FIGS. 1 to 3 .

In one embodiment, as shown in FIG. 1 , the negative electrode material production equipment 10 includes a dispersion tank 11 , a drying device 12 arranged downstream of the dispersion tank 11 , a first buffer silo 13 arranged downstream of the drying device 12 , a A rotary kiln 15 downstream of a buffer silo 13 and an additive feeding bin 14 arranged upstream of the rotary kiln 15 .

The dispersion tank 11 of the present embodiment is used to receive the raw material, the first additive and the solvent and mix the raw material, the first additive and the solvent to form a slurry. The dispersing tank 11 makes the material flow in a ring shape through the high-speed operation of the dispersing disc set inside, generating a strong vortex, and descending to the bottom of the vortex in a spiral shape, thereby generating strong shearing impact and friction, achieving rapid dispersion and uniform mixing, etc. Function. The drying device 12 is used to receive the slurry and to dry and granulate the slurry to form a powder. The first buffer silo 13 is connected with the drying device 12 to receive the buffer powder. The first buffer storage bin 13 and the additive feeding bin 14 are respectively used for feeding powder and the second additive to the rotary kiln 15 . The rotary kiln 15 is used to receive the powder and the second additive and to mix and sinter the second additive and the powder to form a product. The product usually needs to be screened, demagnetized or packaged to form the final product.

The negative electrode material production equipment 10 of this embodiment includes a dispersion tank 11 , a drying device 12 , a first buffer storage bin 13 , an additive feeding bin 14 and a rotary kiln 15 . The dispersion tank 11 in this embodiment can disperse and mix materials such as solvents and raw materials to form a slurry. The drying device 12 dries the mixed slurry to form powder. The rotary furnace 15 itself has a relatively large volume, which reduces the limitation of the volume on the production output of the negative electrode material and increases the production output. During the sintering process of the rotary furnace 15, the furnace body can be slowly rotated to mix and/or crush the materials added to itself through the first buffer silo 13 and the additive feeding silo 14, so as to save the mixing process before entering the furnace. And the crushing process after the traditional process is discharged, simplifying the processing process and improving the production efficiency. During the sintering process of the rotary furnace 15, the furnace body can be rotated slowly and uniformly, so that the material is heated more evenly during the sintering process, and the performance of the output negative electrode material is optimized. The first buffer silo 13 and the additive feeding silo 14 respectively put materials into the rotary furnace 15, so that it is easy to realize the automation of the feeding process and facilitate remote control. The first buffer silo 13 and the additive feeding silo 14 respectively put materials into the rotary kiln 15, which can reduce the possibility of contamination between the stored materials and help to control the amount of materials put in.

In one embodiment, the anode material production apparatus 10 further includes a first screw meter 16 and a second screw meter 17 . The first spiral meter 16 is arranged between the first buffer silo 13 and the rotary furnace 15 . The second screw meter 17 is arranged between the additive feeding bin 14 and the rotary kiln 15 . The powder stored in the first buffer silo 13 can be weighed and measured by the first screw meter 16 and then quantitatively put into the rotary kiln 15, and the additive stored in the additive feeding bin 14 can be weighed by the second screw meter 17. After measuring, it is put into the rotary kiln 15 quantitatively. In this way, the amount of materials put into the rotary kiln 15 by the first buffer silo 13 and the additive feeding silo 14 can be accurately controlled, the accuracy of the amount of material put in is improved, the quality of processed products is improved, and the possibility of material waste is also reduced.

When the negative electrode material drying equipment is running, the first buffer silo 13 and the additive feeding silo 14 will 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 put materials into the rotary furnace 15, the first buffer silo 13 and the additive feeding silo 14. Due to its own vibration, it is possible that the powder and additives may fall too fast due to vibration, resulting in an excessive amount of feeding. In the embodiment in which the first screw meter 16 and the second screw meter 17 are provided, the material feeding process of the first screw meter 16 and the second screw meter 17 is not affected by vibration, thereby effectively ensuring the first buffer silo 13 and additive dosing bin 14 for the accuracy of material dosing.

In one embodiment, the negative electrode material production equipment 10 further includes a first thermal insulation device 18 and a second thermal insulation device 19 . The first heat insulating device 18 is disposed between the first buffer silo 13 and the rotary furnace 15 . The second heat insulating device 19 is arranged between the additive feeding bin 14 and the rotary kiln 15 . When the rotary kiln 15 operates, it is in a high temperature state. The first buffer silo 13 and the additive feeding silo 14 can be isolated from the rotary furnace 15 by the first heat insulation device 18 and the second heat insulation device 19 respectively, which can effectively prevent the heat of the rotary furnace 15 from flowing to the first buffer silo 13 and the additives. The feeding silo 14 conducts conduction, thereby reducing the possibility that the temperature of the first buffer silo 13 and the additive feeding silo 14 is too high to cause deterioration or adverse reactions of the internally stored materials, thereby helping to ensure the quality, reliability and quality of the obtained negative electrode material. stability. Optionally, both the first heat insulating device 18 and the second heat insulating device 19 include heat-resistant components made of heat-resistant materials.

In one embodiment, as shown in FIG. 2 , the negative electrode material production equipment 10 further includes a first exhaust gas treatment device 20 . The rotary furnace 15 is connected to the first exhaust gas treatment device 20 . The first tail gas treatment device 20 is used to receive the burnt tail gas output from the rotary furnace 15 and purify the burn tail gas. During the sintering process of the rotary furnace 15, toxic and harmful gas impurities will be generated in the rotary furnace 15. The gas impurities in the rotary furnace 15 will be transported to the first exhaust gas treatment device 20 for treatment and evacuated after reaching the standard, thereby reducing the possibility of polluting the environment and improving the environmental friendliness and safety of the negative electrode material production equipment 10 .

In one embodiment, the negative electrode material production equipment 10 further includes a third thermal insulation device 22 , a cooling silo 40 and a second buffer silo 21 . The cooling silo 40 is disposed downstream of the rotary kiln 15 and serves to receive the product discharged from the rotary kiln 15 and cool the product. Since the temperature of the product discharged from the rotary furnace 15 is relatively high, it is sent to the cooling silo 40 for cooling treatment. A stirring blade is arranged inside the cooling silo 40 . Stirring paddles can stir the product for rapid cooling of the product. The stirring blade may be a propeller blade. The second buffer silo 21 is disposed downstream of the cooling silo 40 for receiving the cooled product discharged from the cooling silo 40 and buffering the product. After the rotary kiln 15 completely discharges the sintered products to the cooling silo 40 and the second buffer silo 21, and closes the second buffer silo 21, the rotary kiln 15 can process the next batch of materials, so no need Downtime to ensure production continuity. The third heat insulation device 22 is arranged between the rotary furnace 15 and the cooling silo 40, thereby reducing the possibility of the heat of the rotary furnace 15 being transferred to the cooling silo 40 and the second buffer silo 21, reducing the possibility of the cooling silo 40 and the second buffer silo 21 being transferred. The possibility that the cooling effect of the second buffer silo 21 will deteriorate due to its high temperature. Optionally, the third heat insulating device 22 includes a heat-resisting member made of heat-resisting material.

In one embodiment, the negative electrode material production equipment 10 further includes a third screw meter 23 connected with the second buffer silo 21 , a screening part 24 and an iron removing part 25 . The outlet of the second buffer silo 21 is connected to the third screw meter 23 . The second buffer silo 21 is weighed and measured by the third screw meter 23 to output the product. If the third screw meter 23 is not provided, when the second buffer silo 21 puts materials into the downstream screening part 24, the second buffer silo 21 itself will vibrate, which will easily cause the product to be vibrated and fall off. Falling too fast will result in an excessive amount of feeding, which will affect the screening performance of the downstream screening component 24 . In the embodiment in which the third screw meter 23 is provided, the third screw meter 23 is not affected by vibration, thereby effectively ensuring the accuracy of the dosage of the second buffer bin 21 . The products output from the second buffer silo 21 are sieved by the sieving component 24 to sieve out the negative electrode material with a qualified particle size. Alternatively, the screening component 24 may be an ultrasonic vibrating screen. The magnetic impurities in the product are removed by the iron removing part 25, and the purity of the negative electrode material is improved. Optionally, the iron removing part 25 may be an electromagnetic iron remover. The negative electrode material purified by the iron removing part 25 falls into the downstream packaging machine 38 for packaging.

In one embodiment, as shown in FIG. 2 , the anode material production equipment 10 further includes a closed-loop pneumatic conveying device 26 . The outlet of the rotary kiln 15 communicates with the outlet of the closed-loop pneumatic conveying device 26 . The second buffer bin 21 has a bin top filter 39 . The top filter 39 communicates with the inlet of the closed loop pneumatic conveying device 26 . The closed-loop pneumatic conveying device 26 is used to provide gas for the negative electrode material production equipment 10, and use the gas as a carrier to provide pneumatic power, so as to blow the material in the corresponding pipeline to complete the material transportation. Through the gas input by the closed-loop pneumatic conveying device 26 , the product output from the rotary kiln 15 can be conveyed to the second buffer silo 21 . The gas input by the closed-loop pneumatic conveying device 26 is finally output from the bin top filter 39 . The gas output after being dedusted and purified by the silo top filter 39 is returned to the closed-loop pneumatic conveying device 26, so that the gas can be recycled and energy consumption is reduced. In the embodiment in which the anode material production apparatus 10 includes a cooling silo 40 , the cooling silo 40 is connected to the outlet of the rotary kiln 15 . The outlet of the cooling silo 40 communicates with the outlet of the closed loop pneumatic conveying device 26 .

In one example, the closed-loop pneumatic conveying device 26 includes a connected nitrogen gas source 261 , a roots blower 262 , a filter 263 , a cooler 264 , a combustible gas detector 265 and an oxygen concentration detector 266 . The roots blower 262 transports the nitrogen output from the nitrogen gas 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 a filter 263 and a cooler 264, so as to ensure that the temperature of the returned nitrogen gas itself maintains 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 returned to the closed-loop pneumatic conveying device 26 through the combustible gas detector 265 and the oxygen concentration detector 266 . When the flammable gas concentration and the oxygen concentration reach a predetermined concentration threshold, the nitrogen circulating back into the closed-loop pneumatic conveying device 26 is discharged to the second exhaust gas treatment device 36, thereby ensuring the safety of the circulating nitrogen and reducing the possibility of explosion. Finally, it is emptied after being purified by the second exhaust gas treatment device 36, so as to improve the environmental protection of the negative electrode material production equipment 10 and ensure that the exhaust gas meets the environmental protection requirements.

In one embodiment, the negative electrode material production equipment 10 further includes a raw material feeding bin 27 connected to the dispersion tank 11 . The raw material feeding bin 27 is used for feeding raw materials into the dispersion tank 11 . The raw material feeding bin 27 stores raw materials in advance, and the raw materials can be quantitatively fed into the dispersion tank 11 through a screw meter. Since the raw material feeding bin 27 is used to feed raw materials into the dispersion tank 11 , the raw material feeding bin 27 can isolate the dispersion tank 11 from the external environment, thereby reducing the possibility of the dispersion tank 11 coming into contact with the outside air. Using the raw material feeding bin 27 to feed raw materials into the dispersion tank 11 can also improve the convenience and accuracy of feeding. The dispersion tank 11 has an additive feeding port 111 . The additive feeding port 111 is used for feeding the first additive into the dispersion tank 11 . Optionally, an additive feeding port 111 is provided at the top of the dispersion tank 11 , so that the first additive can be injected from the top of the dispersion tank 11 . The additive feeding port 111 includes a funnel-shaped storage member, a connecting pipe connecting the storage member and the dispersion tank 11, and a valve arranged on the connecting pipe.

In one embodiment, the anode material production facility 10 also includes a solvent metering tank 28 . The solvent metering tank 28 is provided upstream of the dispersion tank 11 . The solvent metering tank 28 is used to deliver the dispersion solvent to the dispersion tank 11 . The dispersing solvent is quantitatively measured by the solvent measuring tank 28, and then transported to the dispersing tank 11, thereby helping to improve the accuracy of the solvent dosage. In one example, the solvent metering tank 28 and the dispersion tank 11 are equipped with liquid level alarms, and when the liquid level exceeds a predetermined threshold value, it is interlocked with the valve to stop feeding, which is easy to achieve precise control of the solvent metering tank 28 and the dispersion tank 11 . In one example, the anode material production facility 10 also includes a solvent storage tank 37 . The solvent storage tank 37 is arranged upstream of the solvent metering tank 28 and is connected by pipes and valves. In one example, the number of dispersion tanks 11 is more than two, so as to realize redundant design and reduce the possibility of downtime.

In one embodiment, as shown in FIGS. 2 and 3 , the anode material production equipment 10 further includes a conveying pipeline 29 , a slurry circulating pipeline 30 and a first valve 31 . The dispersion tank 11 is connected to the drying device 12 through a conveying line 29 . The slurry circulation pipeline 30 communicates with the conveying pipeline 29 and the dispersion tank 11 . The first valve 31 is used to control the closing or conduction of the slurry circulation pipeline 30 , or the pressure or flow rate of the slurry supplied to the drying device 12 is controlled by adjusting the opening of the first valve 31 . When the first valve 31 is opened and the conveying pipeline stops conveying the slurry to the dispersion tank 11, the slurry can continue to circulate in the dispersion tank 11 through the slurry circulation pipeline 30 and is not easy to deposit, so as to reduce the effect of slurry stratification on the dispersion effect And lead to the possibility of material performance degradation, which is beneficial to improve the quality of the finally obtained negative electrode material.

In one embodiment, the negative electrode material production equipment 10 further includes a cleaning pipeline 32 and a second valve 33 that blocks or conducts the cleaning pipeline 32 . The solvent metering tank 28 is connected to the dispersion tank 11 , the slurry circulation line 30 and the drying device 12 through the cleaning line 32 to clean the dispersion tank 11 , the slurry circulation line 30 and/or the drying device 12 through the cleaning line 32 , so as to help improve the internal cleanliness of the dispersion tank 11, the slurry circulation pipeline 30 and/or the drying device 12, and reduce the adhesion of powder inside the dispersion tank 11, the slurry circulation pipeline 30 and/or the drying device 12. The possibility of affecting the quality of the product or the normal operation of the equipment. When the dispersion tank 11, the slurry circulation pipeline 30 and/or the drying device 12 need to be cleaned, the solvent metering tank 28 stops delivering the solvent into the dispersion tank 11, and the second valve 33 is opened, and the solvent metering tank 28 sends the solvent to the cleaning pipeline. 32 The solvent is input and the dispersion tank 11 , the slurry circulation line 30 and/or the drying device 12 are cleaned.

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 inside of the dispersion tank 11 . The inlet of the dispersion tank 11 and the inlet of the cleaning pipeline 32 are both connected to the outlet of the first diaphragm pump 34 , so that the solvent can be pumped into the cleaning pipeline 32 through the first diaphragm pump 34 . The inlet of the second diaphragm pump 35 is connected with the outlet of the dispersion tank 11 , and the outlet of the second diaphragm pump 35 is connected with the inlet of the drying device 12 and the inlet of the slurry circulation pipeline 30 , and is used for mixing the mixture through the dispersion tank 11 . The homogenized slurry is pumped into the drying device 12 or the slurry circulation pipeline 30 . The first diaphragm pump 34 and the second diaphragm pump 35 can provide a small amount of agitation to the conveyed material when providing conveying power for the material, thereby helping to ensure stable material performance and improving the final product quality of the negative electrode material.

In one embodiment, the drying device 12 includes a centrifugal atomization drying tower, a cyclone separator, a dust collector and a transfer silo. Centrifugal atomization drying tower, cyclone separator and dust collector are connected in series. The centrifugal atomization drying tower is arranged downstream of the dispersion tank 11 . The centrifugal atomization drying tower can centrifugally atomize the slurry. The spherical fog beads formed after atomization quickly evaporate the solvent in the high temperature gas atmosphere in the centrifugal atomization drying tower, thereby being dried to form powder. The cyclone separator is arranged downstream of the centrifugal atomization drying tower, and is used to receive the powder discharged from the centrifugal atomization drying tower. The cyclone separator can screen the powder and discharge the qualified powder. The unqualified powder screened by the cyclone will enter the dust collector and be captured and filtered by the dust collector. The transfer silo is arranged downstream of the cyclone separator. The first buffer silo 13 is arranged downstream of the transfer silo. In one example, the anode material production facility 10 also includes a closed-loop pneumatic conveying device 26 . The outlet of the cyclone separator, the outlet of the transfer silo, and the outlet of the rotary furnace 15 are respectively communicated with the outlet of the closed-loop pneumatic conveying device 26 . Both the transfer bin and the first buffer bin 13 have bin top filters 39 . The top filter 39 communicates with the inlet of the closed loop pneumatic conveying device 26 . The powder discharged from the cyclone separator is transported to the transfer silo under the action of the gas input from the closed-loop pneumatic conveying device 26 . The transfer silo can temporarily store powder. After the first buffer silo 13 puts its own powder into the rotary kiln 15, the powder in the transfer silo is transported to the first buffer silo 13 under the action of the gas input from the closed-loop pneumatic conveying device 26, so as to be transferred. The silo can receive the next batch of powder from the cyclone separator, which is beneficial to ensure the continuity of production and improve production efficiency. The gas that has been dedusted and purified by the silo top filter 39 is outputted to the silo top filter 39 and returned to the closed-loop pneumatic conveying device 26 for recycling and energy saving.

In one embodiment, both the dust collector and the closed-loop pneumatic conveying device 26 are connected to the second exhaust gas treatment device 36 . The second exhaust gas treatment device 36 is used to receive and purify the exhaust gas discharged from the dust collector and the closed-loop pneumatic conveying device 26 . The exhaust gas is evacuated after being purified by the second exhaust gas treatment device 36 .

In one embodiment, the negative electrode material production equipment 10 further includes a dust removal device. The dust removal device can centrally filter and capture the dust generated during the operation of the raw material feeding bin 27 and the additive feeding port 111 in the negative material production equipment 10, so as to prevent the flying dust from escaping and reduce the pollution of the dust to the working environment.

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

The negative electrode material production equipment 10 according to the embodiment of the present invention can save time in the mixing process, reduce processing steps, improve production efficiency, and produce high quality negative electrode material products.

While the present invention has been described with reference to preferred embodiments, various modifications may be made and equivalents may be substituted for parts thereof without departing from the scope of the invention, particularly, provided that structural conflicts do not exist , each technical feature mentioned in each embodiment can be combined in any manner. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims (15)

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.

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