Raw material production device for negative electrode material of lithium battery

Abstract

The utility model belongs to the technical field of chemical equipment, and discloses a lithium battery cathode material raw material production device which comprises a reaction kettle provided with a stirrer, a double-layer stirring blade is arranged at the bottom of a stirring shaft of the stirrer, and four sets of annular electric tracing bands are arranged on the side wall of a kettle body of the reaction kettle from top to bottom. Temperature sensors are inserted into the side walls of the kettle at the upper part or the lower part of the electric tracing band, and are electrically connected to an automatic control system; a nitrogen input pipe is arranged at the bottom of the reaction kettle, and an air input pipe is embedded in the nitrogen input pipe; a tail gas outlet is formed in the top of the reaction kettle and is communicated with a tail gas treatment system through a pipeline. The device is simple in structure, raw materials are easy to obtain, the homogeneity of obtained products is high, and the yield is controllable.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of chemical production equipment, concretely relates to a lithium battery negative material raw material production device. BACKGROUND

[0002] The lithium battery negative material is a kind of raw material for constituting negative electrode in battery, and the common negative electrode material currently includes carbon negative electrode material, tin-based negative electrode material, lithium-containing transition metal nitride negative electrode material, alloy type negative electrode material and nanoscale negative electrode material.The negative electrode material actually used in lithium ion battery is generally carbon material, such as graphite, soft carbon (such as coke, etc.), hard carbon, etc.In the existing production process, high softening point pitch in the mixture containing various mixed aromatic hydrocarbons obtained from coal tar processing process is separated out, and used as the raw material of negative electrode material for lithium ion battery, but this process is complex, and is limited by the yield of mixture in coal tar processing process, which seriously restricts the production of raw material of negative electrode material for lithium ion battery. SUMMARY

[0003] The utility model solves the technical problems that provide a kind of lithium battery negative material raw material production device, overcome the defects of prior art, provide a kind of simple structure reaction device, can carry out modification to coal tar pitch, prepare into lithium battery negative material raw material, expand the source of production raw material, solve the production raw material problem, and the product produced is high in homogeneity.

[0004] To solve the above technical problems, the technical scheme of the utility model is:

[0005] A lithium battery negative material raw material production device, including the reaction kettle being equipped with stirrer, the bottom of the stirring shaft of stirrer is equipped with double-layer stirring paddle;The kettle body side wall of reaction kettle is equipped with four sets of annular electric heating tape from top to bottom, and temperature sensor is inserted into the kettle side wall on the upper portion or lower portion of electric heating tape, and temperature sensor is electrically connected to automatic control system;The bottom of reaction kettle is equipped with nitrogen input pipe, and air input pipe is embedded in nitrogen input pipe;The top of reaction kettle is equipped with tail gas outlet, and tail gas outlet is communicated to tail gas treatment system by pipeline.

[0006] Preferably, the stirrer is provided with a mechanical seal device at the connection between the stirrer and the kettle top of the reaction kettle, and the mechanical seal device is provided with a cooling system.

[0007] Preferably, the electric heating tape is electrically connected to external power supply, and the external power supply is electrically connected to automatic control system.

[0008] Further, the automatic control system is a DCS automatic control system.

[0009] Preferably, the electric heat tracing bands are four sets, from the top to the bottom of the reactor, they are: upper electric heat tracing band, middle electric heat tracing band, lower electric heat tracing band and bottom electric heat tracing band (the specific position is set according to the material loading) ; the number of each set of electric heat tracing bands is: 2 upper electric heat tracing bands, 5 middle electric heat tracing bands, 6 lower electric heat tracing bands and 4 bottom electric heat tracing bands (because in actual production of the reactor, the material concentration position is biased to the middle and lower, so the number of lower electric heat tracing bands is concentrated).

[0010] Preferably, one end of the nitrogen input pipe is connected to an external nitrogen supply system, and the other end is inserted into the reactor to branch into three branches at an angle of 120 degrees, and the outlets of the three branches are provided with gas outlet nozzles; correspondingly, one end of the air input pipe is connected to an external air supply system, and the other end is inserted into the reactor to branch into three branches at an angle of 120 degrees, and the three branches share the gas outlet nozzles with the nitrogen pipe.

[0011] Further, the gas outlet nozzles are all arranged at a height of 160-170 mm above the flange of the reactor bottom.

[0012] Preferably, flow meters and control valves are arranged on the nitrogen input pipe and the air input pipe, and the flow meters and the control valves are electrically connected to an automatic control system (DCS automatic control system).

[0013] Preferably, the tail gas treatment system comprises, in sequence through pipelines and valves, a heat exchanger, an oil washing tank, a tail gas cooler, a gas-liquid separator, a filter and an alkali washing tower; the liquid outlet of the oil washing tank is connected to an oil washing cooler and an oil washing tank through pipelines in sequence, the liquid outlets of the gas-liquid separator and the filter are connected to a liquid collecting tank through pipelines, and the liquid collecting tank is connected to the oil washing tank through a pipeline; the alkali washing tower is provided with a tail gas outlet, a soft water outlet and a high-concentration water outlet, the tail gas outlet is connected to a first gas separator, a second gas separator and a tubular furnace through pipelines in sequence, the soft water outlet is connected to a soft water storage tank through a pipeline and a soft water cooler, and the high-concentration water outlet is connected to a first oil separator, a second oil separator and a high-concentration water storage tank through pipelines in sequence.

[0014] Further, the liquid outlet of the second gas separator is connected to the liquid collecting tank.

[0015] Due to the adoption of the above technical scheme, the present application has the following beneficial effects:

[0016] In summary, the present application can improve the coal tar pitch by controllable oxidation treatment under high-temperature and sealed conditions in the reactor, so as to produce negative material for high-capacity lithium batteries; the raw material is easy to obtain, the product obtained is high in homogeneity, and the yield is controllable. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a structural schematic diagram of the present application;

[0018] Figure 2 is a structural schematic diagram of the present application;

[0019] In the figure, 1, reactor; 2, stirrer; 3, electric heat tracing band; 4, temperature sensor; 5, nitrogen input pipe; 6, heat exchanger; 7, oil washing tank; 8, tail gas cooler; 9, gas-liquid separator; 10, filter; 11, caustic washing tower; 12, oil washing cooler; 13, oil washing tank; 14, liquid collecting tank; 15, one gas separator; 16, two gas separators; 17, tubular furnace; 18, soft water cooler; 19, soft water storage tank; 20, one oil separator; 21, two oil separators; 22, high concentration water storage tank. DETAILED DESCRIPTION

[0020] The present application will be further described below in combination with the drawings and examples.

[0021] Example 1

[0022] As shown in Figure 1 and Figure 2 , the present application is a kind of lithium battery negative material raw material production device, including the reactor 1 with stirrer 2, the bottom of the stirring shaft (not marked) of stirrer 2 is equipped with double-layer stirring paddle (not marked);The kettle body side wall of reactor 1 is provided with four annular electric heat tracing bands 3 from top to bottom, temperature sensor 4 is inserted on the kettle side wall of the upper or lower part of electric heat tracing band 3, and temperature sensor 4 is electrically connected to automatic control system (not marked);The bottom of reactor 1 is provided with nitrogen input pipe 5, and air input pipe (not marked) is embedded in nitrogen input pipe 5;The top of reactor 1 is provided with tail gas outlet (not marked), and tail gas outlet (not marked) is communicated to tail gas treatment system (not marked) through pipeline.

[0023] Tail gas treatment system includes heat exchanger 6, oil washing tank 7, tail gas cooler 8, gas-liquid separator 9, filter 10 and caustic washing tower 11 (tail gas treatment process) communicated in sequence through pipeline (not marked) and valve (not marked);The liquid outlet of oil washing tank 7 is communicated to oil washing cooler 12 and oil washing tank 13 in sequence through pipeline;The liquid outlet of gas-liquid separator 9 and filter 10 is communicated to liquid collecting tank 14 through pipeline, and liquid collecting tank 14 is provided with pipeline connected to oil washing tank 13;Caustic washing tower 11 is provided with tail gas outlet (not marked), soft water outlet (not marked) and high concentration water outlet (not marked), tail gas outlet is communicated to one gas separator 15, two gas separators 16 and tubular furnace 17 in sequence through pipeline;Soft water outlet is communicated to soft water storage tank 19 through pipeline and soft water cooler 18;High concentration water outlet is communicated to one oil separator 20, two oil separators 21 and high concentration water storage tank 22 in sequence through pipeline.

[0024] The actual production process is as follows: before production, the DCS automatic control system is used to set and start the control program; after the production starts, the coal tar pitch is input into the reaction kettle through the pipeline; after the feeding is completed, the four annular electric heating bands 3 start to control the temperature according to the process requirements, the temperature of each area of the reaction kettle is gradually increased to the predetermined temperature (by controlling the temperature of the electric heating band 3), the material temperature is maintained at 350-400 DEG C from top to bottom (the temperature is increased in turn), the stirrer 2 is slowly stirred to ensure the movement of the material, but the movement amplitude is small. During the feeding and temperature rising process, the nitrogen gas is continuously input at the bottom to avoid the presence of oxygen environment in the reaction kettle; after the temperature of each area of the reaction kettle 1 is increased to the predetermined temperature, the heat preservation reaction is started, and the reaction time is adjusted according to the quality requirements of different products; during the reaction stage, the air is gradually increased in the nitrogen system, but the nitrogen gas is not completely withdrawn, and the specific adjustment mode is as follows: the total ventilation amount is kept at 80 m 3 / h, during the heat preservation reaction stage, the nitrogen flow is reduced by 10 m 3 / h per hour, the air flow is increased by 10 m 3 / h per hour, until the nitrogen flow is reduced to 20 m 3 / h, and the air flow is increased to 60 m 3 / h, so as to realize the modification of the coal tar pitch at high temperature. After the reaction is completed, the nitrogen flow is increased to 80 m 3 / h for a short time, the air flow is reduced to 0 m 3 / h, and then the product can be discharged from the discharge port at the bottom of the reaction kettle 1 to the finished product storage tank.

[0025] The tail gas generated in the reaction is input into the oil washing tank 7 through the heat exchanger 6 for the first treatment, the washing oil condensed after the heat exchange is cooled by the washing oil cooler 12 and then input into the washing oil tank 13 for temporary storage; the tail gas after removing the washing oil is sequentially input into the alkali washing tower 11 through the tail gas cooler 8, the gas-liquid separator 9 and the filter 10 for the second treatment, wherein the condensed liquid formed in the gas-liquid separator 9 and the filter 10 is temporarily stored in the liquid collecting tank 14; the alkali washing tower 11 is provided with a tail gas outlet (not marked), a soft water outlet (not marked) and a high-concentration water outlet (not marked), the treated tail gas is sequentially input into the tubular furnace 17 for combustion after being treated by the first gas separator 15 and the second gas separator 16; the obtained soft water is cooled by the soft water cooler 18 after being input from the soft water outlet and then input into the soft water storage tank 19 for temporary storage; the obtained high-concentration water with high oil content is sequentially input into the first oil separator 20 and the second oil separator 21 through the high-concentration water outlet and the pipeline, the oil therein is separated (collected and treated), and the remaining water is input into the high-concentration water storage tank 22 for temporary storage.

[0026] It should be understood that the embodiments are only used for illustrating the present application and are not used for limiting the scope of the present application. In addition, it should be understood that after reading the content taught by the present application, those skilled in the art can make various changes or modifications to the present application, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

Claims

1. A device for producing raw materials for lithium battery negative electrode materials, characterized by: The reaction kettle comprises a reaction kettle provided with a stirrer, the bottom of the stirring shaft of the stirrer is provided with double-layer stirring blades; the side wall of the kettle body of the reaction kettle is provided with four sets of annular electric heating tapes from top to bottom, temperature sensors are inserted into the upper or lower side wall of the electric heating tapes, and the temperature sensors are electrically connected to an automatic control system; the bottom of the reaction kettle is provided with a nitrogen input pipe, and an air input pipe is embedded in the nitrogen input pipe; the top of the reaction kettle is provided with a tail gas outlet, and the tail gas outlet is connected to a tail gas treatment system through a pipeline.

2. The lithium battery anode material feedstock production apparatus of claim 1, wherein: The electric heating tapes are electrically connected to an external power supply, and the external power supply is electrically connected to a DCS automatic control system.

3. The lithium battery anode material feedstock production apparatus of claim 1, wherein: The electric heating tapes are arranged in the reaction kettle from top to bottom as follows: kettle upper electric heating tapes, kettle middle electric heating tapes, kettle lower electric heating tapes and kettle bottom electric heating tapes, and the number of each type of the electric heating tapes is 2, 5, 6 and 4 respectively.

4. The lithium battery anode material feedstock production apparatus of claim 1, wherein: One end of the nitrogen input pipe is connected to an external nitrogen supply system, and the other end is inserted into the reaction kettle and uniformly branched into three branches at an angle of 120 degrees, and the outlets of the three branches are provided with gas outlet nozzles; correspondingly, one end of the air input pipe is connected to an external air supply system, and the other end is inserted into the reaction kettle and uniformly branched into three branches at an angle of 120 degrees, and the three branches share the gas outlet nozzles with the nitrogen pipe.

5. The lithium battery negative electrode material production device according to claim 1, characterized in that: Flowmeters and control valves are arranged on the nitrogen input pipe and the air input pipe, and the flowmeters and the control valves are electrically connected to the DCS automatic control system.

6. The lithium battery anode material feedstock production apparatus of claim 1, wherein: The tail gas treatment system comprises a heat exchanger, an oil washing tank, a tail gas cooler, a gas-liquid separator, a filter and an alkali washing tower which are sequentially connected through pipelines and valves; the liquid outlet of the oil washing tank is sequentially connected to an oil washing cooler and an oil washing tank through a pipeline, the liquid outlets of the gas-liquid separator and the filter are connected to a liquid collecting tank through a pipeline, and the liquid collecting tank is connected to the oil washing tank through a pipeline; the alkali washing tower is provided with a tail gas outlet, a soft water outlet and a high-concentration water outlet, the tail gas outlet is sequentially connected to a first gas separator, a second gas separator and a tubular furnace through a pipeline; the soft water outlet is connected to a soft water storage tank through a pipeline and a soft water cooler; and the high-concentration water outlet is sequentially connected to a first oil separator, a second oil separator and a high-concentration water storage tank through a pipeline.

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