CN112138828A - Superfine grinding device system of battery-grade lithium hydroxide - Google Patents
Superfine grinding device system of battery-grade lithium hydroxide Download PDFInfo
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- CN112138828A CN112138828A CN202010727748.7A CN202010727748A CN112138828A CN 112138828 A CN112138828 A CN 112138828A CN 202010727748 A CN202010727748 A CN 202010727748A CN 112138828 A CN112138828 A CN 112138828A
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- air
- pipeline
- carbon dioxide
- valve
- lithium hydroxide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C19/00—Other disintegrating devices or methods
- B02C19/06—Jet mills
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/02—Feeding devices
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- Food Science & Technology (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention relates to a superfine crushing device system of battery-grade lithium hydroxide, which is characterized in that a main body of the superfine crushing device system is an airflow mill main machine, a feeding port, an air inlet and a discharging port are arranged on the airflow mill main machine, an air compressor, a carbon dioxide removing device, a cold dryer and a first air filter are arranged on a gas circulation pipeline, an induced air pipeline is arranged on the gas circulation pipeline, an induced air fan is arranged on the induced air pipeline, a direct connection channel is arranged at the air inlet of the airflow mill main machine and is connected with the carbon dioxide removing device, an air supplementing port is arranged in the middle of the airflow mill main machine, and a second air filter and an air supplementing fan are arranged. The closed-loop jet mill is suitable for superfine grinding of lithium hydroxide, and is a closed-loop jet mill host system which is efficient, energy-saving, protected by inert gas, free of emission and zero in pollution.
Description
Technical Field
The invention belongs to the technical field of crushing and grading devices, and particularly relates to a battery-grade lithium hydroxide ultrafine crushing device system.
Background
At the present stage, the global energy structure is in the adjustment stage, the market of new energy automobiles is outbreaked, the high-nickel ternary material is used in the field of power batteries of electric automobiles, and lithium hydroxide can improve the tap density of the high-nickel ternary material and realize better charge and discharge performance, so the lithium hydroxide is the main raw material of the high-nickel ternary material, and the application proportion reaches more than 60%.
Lithium hydroxide has a strong basicity, a pH of about 14 for a 1mol/L solution, an irritating odor, and is corrosive. If dust leakage exists in the crushing process, the powder has harm to human bodies and space environments. Can react with carbon dioxide in the air to generate lithium carbonate; is dissolved in water, and thus absorbs moisture in the air, affecting the quality of the product.
In the conventional open-loop jet milling system, the grinding medium used is air, and although carbon dioxide and water in the air can be discharged through a carbon dioxide removal device, a large amount of fresh air needs to be continuously treated in the production process, and the air source treatment efficiency is low.
In the conventional open-loop jet milling system, the grinding gas is directly discharged into the atmosphere after gas-solid separation of the dust remover, and no matter how high-efficiency the dust remover is used for a long time, the risk of leakage exists, and the harm is caused to the human body and the environment around the equipment.
The granularity D50 of a common lithium hydroxide product is required to be 10-15 mu m, a large number of finer particles can be generated when the lithium hydroxide product is ground by using an air flow mill, namely, the lithium hydroxide product is ground, although D50 can meet the contract index, the content of fine powder in the product is too high, for example, the requirement D50 is requiredminOr D10Or the content of particles of a certain particle size is not higher than a certain value, the product quality is degraded or rejected. Using other comminution processes such as mechanical comminution, although the fines content is low, large amounts of large particles are produced and the particle size distribution of the product is broadened and remains an off-spec product.
Disclosure of Invention
The invention aims to solve the problems and provide a superfine crushing device system of battery-grade lithium hydroxide, which can be used for carrying out gas closed-loop circulation crushing on the lithium hydroxide and improving powder classification by improving a gas circulation pipeline.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
the superfine crushing device system for the battery-grade lithium hydroxide is characterized in that a direct-connection passage is arranged at the air inlet of the air flow mill host, the direct-connection passage is connected with the carbon dioxide removing device, the air drying machine and a first air filter are arranged on an air circulation pipeline, and an induced air fan is arranged on the induced air pipeline.
Further, the rear portion of the air compressor is connected with the air storage tank and the cold dryer, a gas return pipeline is arranged between the air inlet of the first air filter and the air outlet of the air compressor, and a ball valve, a pressure reducing valve and a first electromagnetic valve are arranged on the gas return pipeline.
Furthermore, a leak source detection branch is arranged on an air inlet of the main machine of the jet mill, the other end of the leak source detection branch is connected with a carbon dioxide removing device, a carbon dioxide sensor and a first pressure sensor are arranged on the leak source detection branch, and the carbon dioxide sensor is connected with a second electromagnetic valve on a connecting pipeline of the induced draft fan through a controller.
Furthermore, a second pressure sensor is arranged at the outlet of the dust collector, and an air supplementing valve, an air exhausting valve and an air releasing valve are arranged on a pipeline for connecting the air inducing pipeline and the outlet of the dust collector.
The invention has the beneficial effects that:
the closed-loop jet mill host system is suitable for crushing and grading lithium battery materials, such as lithium iron phosphate, high-nickel ternary, lithium carbonate, lithium titanate, lithium hydroxide, silicon monoxide and the like, is particularly suitable for ultrafine crushing of lithium hydroxide, and is a closed-loop jet mill host system which is efficient, energy-saving, protected by inert gas, free of emission and zero in pollution.
The method uses normal temperature air, and reduces the moisture content of materials in the crushing process after carbon dioxide removal and dehumidification treatment.
(1) The device system is in closed circulation to prevent external air from entering the system;
(2) the outward leakage of grinding gas in the crushing process is reduced, and the loss is reduced;
(3) the over-crushing condition is avoided, and the uniform particle size distribution of the product is ensured;
(4) aiming at automatic monitoring of pressure and carbon dioxide content, the system is maintained to operate stably.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a connection structure of a system for ultrafine comminution of battery-grade lithium hydroxide according to the present invention;
FIG. 2 is a schematic view of a gas return line according to the present invention;
reference numerals: a jet mill host machine-1, a feed inlet-11, an air inlet-12, a discharge outlet-13, an air supplementing port-14, a feed hopper-2, a cyclone separator-31, a dust collector-32, an air outlet-321 of the dust collector, an air circulation pipeline-4, a carbon dioxide removing device-41, a cold dryer-42, a first air filter-43, an air compressor-44, an air reflux pipeline-45, an air storage tank-46, a pressure reducing valve-47, a first electromagnetic valve-48, an induced air pipeline-5, an induced air fan-51, a direct connection passage-6, a second air filter-71, an air supplementing fan-72, a leak source detection branch-8, a carbon dioxide sensor-81, a first pressure sensor-82, a second pressure sensor-91, a, Air supply valve-92, air discharge valve-93 and air discharge valve-94.
Detailed Description
The following detailed description of the preferred embodiments of the present invention is provided to enable those skilled in the art to more readily understand the advantages and features of the present invention and to clearly and unequivocally define the scope of the present invention.
Referring to the attached figure 1 of the specification, a superfine crushing device system of battery-grade lithium hydroxide comprises a main body of an air flow mill 1, wherein the main body of the air flow mill 1 is provided with a feeding port 11, an air inlet 12 and a discharge port 13, the feeding port 11 is connected with a feeding hopper 2, a pipeline connecting the feeding hopper 2 and the feeding port 11 is provided with a star-shaped feeding valve 21, the discharge port 13 is connected with a cyclone separator 31 and a dust collector 32, a gas circulation pipeline 4 is provided with a carbon dioxide removing device 41, a cold dryer 42 and a first air filter 43, a gas circulation pipeline 4 is provided with an induced air pipeline 5, the induced air pipeline 5 is provided with an induced air fan 51, an air outlet 321 of the dust collector is connected with the carbon dioxide removing device 41 through a pipeline, the discharge port 13 of the main body of the air flow mill 1 is provided with a direct connection passage 6, the direct connection, the air supplement port 14 is connected with a second air filter 71 and an air supplement fan 72 through pipelines to form a gas circulation pipeline.
The lithium hydroxide has different preparation processes, different particle hardness and different product granularity indexes. Thus, during comminution, different comminution pressures are required, i.e. the gas pressure consumed for comminution is adjustable. The closed-loop circulating system is characterized in that the air compressor must be continuously loaded and operated, the system cannot be like an open-loop device system, and redundant air needs to be unloaded and used when air flow cannot be consumed by an air flow mill host. Therefore, in order to ensure the continuous loading of the air compressor and reduce the air flow entering the main machine of the jet mill, a gas return pipeline is designed.
Referring to the attached fig. 2 of the specification, further, the rear portion of the air compressor 44 is connected to the air storage tank 46 and the refrigeration dryer 42, the compressed air is treated by the carbon dioxide removal device to remove carbon dioxide, and is dried, the first air filter 43 is installed in front of the air inlet of the air compressor, the outlet of the first air filter is connected to the inlet of the air compressor 44 through a pipeline, the air outlet of the air compressor 44 is connected to the air return pipeline 45, the other end of the air return pipeline 45 is connected to the air inlet of the first air filter 43, and the air return pipeline 45 is provided with a ball valve 46, a pressure. The gas return pipeline is connected to the inlet of the air compressor from the outlet of the air compressor, the flow of return gas is adjusted by short-circuiting the outlet and the inlet of the air compressor, and partial redundant gas is subjected to self circulation of the air compressor, so that the gas flow entering the main machine of the jet mill is reduced.
Furthermore, a flow sensor is arranged at the outlet of the second air filter and used for monitoring the output flow of the air supply induced draft fan 72, and the output flow determines the air supply amount of the air flow mill main machine 1, so that the change of the product granularity is controlled. The flow sensor is connected with the induced draft fan 72 through the controller, and the controller automatically adjusts the rotating speed of the induced draft fan 72 according to the flow data, so that closed-loop control is realized, and the stability of the flow numerical value is maintained.
Further, a leakage point detection branch 8 is arranged on the jet mill main machine 1, the other end of the leakage point detection branch 8 is connected with the carbon dioxide removal device 41, a carbon dioxide sensor 81 is arranged on the leakage point detection branch 8, and the carbon dioxide sensor 81 is connected with an air compensating valve 92 on a dust collector outlet connecting pipeline through a controller. To control the carbon dioxide content of the grinding gas media to meet the requirements, the carbon dioxide sensor 81 sends a signal to the controller, which controls the gulp valve 92 based on the carbon dioxide content value. When the carbon dioxide content is higher than the requirement, the gas is supplemented, and when the carbon dioxide content meets the requirement, the gas is not supplemented.
Further, a second pressure sensor 91 is arranged at the outlet of the dust collector, and an air compensating valve 92, an air exhausting valve 93 and an air releasing valve 94 are arranged on a pipeline connecting the air inducing pipeline and the outlet of the dust collector. The system can realize closed-loop startup, the gas circulation volume is 40 m/min during operation of the device system, the volume of the device system is about 14m for carrying out heavy planting, and sufficient gas can not be stored at normal pressure. Therefore, the air storage tank device 46 is connected after the freeze-drying machine, the capacity of the air storage tank is 4m, and the maximum allowable pressure is 1 MPa. The inlet of the air storage tank is connected with an induced draft pipeline 5. When the outlet pressure of the dust collector reaches a high limit, opening the air release valve to exhaust, and when the outlet pressure of the dust collector is reduced to a normal value, closing the air release valve; when the pressure at the outlet of the dust collector is still continuously increased after the air release valve is opened, the emptying valve is opened; when the pressure of the dust collection outlet is continuously reduced after the air release valve is closed and is reduced to a certain negative pressure, the emptying valve is opened; when the pressure of the dust collection outlet is reduced to the low limit, the air supply valve is opened; when the pressure of the dust collection outlet reaches a normal value through air supplement, the air supplement valve is closed.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, that the preferred embodiments of the present invention are described above and the present invention is not limited to the preferred embodiments, and that various changes and modifications may be made without departing from the spirit and scope of the present invention and these changes and modifications are within the scope of the invention as claimed.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. The superfine crushing device system for the battery-grade lithium hydroxide is characterized in that a direct-connection passage is arranged at the air inlet of the air flow mill host, the direct-connection passage is connected with the carbon dioxide removing device, the air drying machine and a first air filter are arranged on an air circulation pipeline, and an induced air fan is arranged on the induced air pipeline.
2. The system of claim 1, wherein the air compressor is connected to the air storage tank and the air cooling dryer at the rear, a gas return line is provided between the air inlet of the first air filter and the air outlet of the air compressor, and the gas return line is provided with a ball valve, a pressure reducing valve and a first solenoid valve.
3. The system of claim 1, wherein a leak point detection branch is provided at the air inlet of the jet mill main body, the other end of the leak point detection branch is connected to the carbon dioxide removing device, and a carbon dioxide sensor and a first pressure sensor are provided on the leak point detection branch.
4. The system of claim 1, wherein a second pressure sensor is provided at the outlet of the dust collector, and an air make-up valve, an air release valve and an air release valve are provided on the pipeline connecting the induced air pipeline and the outlet of the dust collector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010727748.7A CN112138828A (en) | 2020-07-27 | 2020-07-27 | Superfine grinding device system of battery-grade lithium hydroxide |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010727748.7A CN112138828A (en) | 2020-07-27 | 2020-07-27 | Superfine grinding device system of battery-grade lithium hydroxide |
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| CN112138828A true CN112138828A (en) | 2020-12-29 |
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| CN202010727748.7A Pending CN112138828A (en) | 2020-07-27 | 2020-07-27 | Superfine grinding device system of battery-grade lithium hydroxide |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115138426A (en) * | 2022-07-01 | 2022-10-04 | 江西金辉锂业有限公司 | Ultrafine grinding device for battery-grade lithium hydroxide |
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| CN209680278U (en) * | 2019-01-30 | 2019-11-26 | 宜兴市优特粉体机械设备有限公司 | Non-carbonized compressed air loop circuit air-flow crushing LITHIUM BATTERY lithium hydroxide system |
| CN110714904A (en) * | 2019-10-22 | 2020-01-21 | 中国工程物理研究院材料研究所 | Gas transfer pump output system and method |
| CN110822760A (en) * | 2018-08-14 | 2020-02-21 | 奥克斯空调股份有限公司 | Air conditioner refrigerant system, refrigerant leakage detection method and air conditioner |
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| DE4329270A1 (en) * | 1993-02-12 | 1994-08-25 | Joachim Kopischke | Installation for the separation of comminuted plastics of various chemical composition and different specific density and process for carrying it out |
| CN101224440A (en) * | 2007-01-17 | 2008-07-23 | 杨建勋 | Gas recycling system of recirculation air pulverizer |
| CN101767046A (en) * | 2009-12-29 | 2010-07-07 | 洛阳宇航重工机械有限公司 | Crushing process of alumina crusting block and production line thereof |
| CN102322570A (en) * | 2011-10-09 | 2012-01-18 | 中国计量学院 | Underwater gas transportation pipeline leakage detection experiment platform |
| CN105944816A (en) * | 2016-06-21 | 2016-09-21 | 江苏密友粉体新装备制造有限公司 | Safe explosion-proof airflow pulverization system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115138426A (en) * | 2022-07-01 | 2022-10-04 | 江西金辉锂业有限公司 | Ultrafine grinding device for battery-grade lithium hydroxide |
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Application publication date: 20201229 |
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