Lithium carbonate extraction production line
By designing a lithium carbonate extraction production line including centrifuge, electric heating rotary drying kiln, air flow crusher and other equipment, the problems of unreasonable design of the existing process flow and unreasonable equipment selection are solved, and high-quality product production and continuous and stable production process are achieved.
Patent Information
- Application Number
- CN202421388678.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-18
- Publication Date
- 2025-05-30
- Estimated Expiration
- 2034-06-18
AI Technical Summary
The existing lithium carbonate extraction process has problems such as unreasonable process flow design, unreasonable equipment selection, and inappropriate material selection, resulting in unqualified products and requires frequent modifications.
A lithium carbonate extraction production line has been designed, including centrifuge, electric heating rotary drying kiln, air flow crusher, ultrasonic vibration chamber and other equipment, and a reasonable process flow and equipment configuration are adopted to ensure continuous production stability and product quality.
It realizes the rationality of the process flow, the universality of the equipment and the high quality of the products, meets the industry standards of battery-grade lithium carbonate, and reduces the transformation needs during the project driving process.
Smart Images
Figure CN222925885U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of lithium carbonate extraction, in particular to a lithium carbonate extraction production line. Background Art
[0002] With the booming development of the new energy industry, battery-grade lithium carbonate, as an important raw material for power batteries, has a huge market demand.
[0003] The requirement for the content of magnetic impurities in battery-grade lithium carbonate is lower than 0.001‰. Therefore, in the whole solid post-treatment process, there are relatively high standards for the process flow design, the selection of process equipment, and the selection of equipment and pipeline materials.
[0004] The main steps of the solid post-treatment process for producing battery-grade lithium carbonate from salt lake brine generally include dehydration, drying, pulverization, and packaging. With the development of the industry and the expansion of production capacity lines, there are problems in the existing technology such as unreasonable process flow design, unreasonable equipment selection, and inappropriate material selection, resulting in unqualified products. Often, modifications are required during the project startup process. Therefore, a lithium carbonate extraction production line is designed. Summary of the Utility Model
[0005] The utility model aims to solve at least one of the technical problems in the related technologies to some extent. For this purpose, an object of the utility model is to provide a lithium carbonate extraction production line with reasonable process flow, high operability, strong equipment versatility, high continuous production stability, and high product quality, meeting the requirements of the battery-grade lithium carbonate industry standard.
[0006] The lithium carbonate extraction production line according to the utility model includes a centrifuge, an electrically heated rotary drying kiln, a first buffer hopper, a second buffer hopper, a jet mill, an ultrasonic vibrating bin, and a finished product bin. A double-shaft screw conveyor is assembled between the centrifuge and the electrically heated rotary drying kiln. A recovery unit is connected to the smoke exhaust end of the electrically heated rotary drying kiln. A jacketed cooling screw is connected to the discharge end of the electrically heated rotary drying kiln. The output end of the jacketed cooling screw is connected to the first buffer hopper. A first negative pressure pneumatic conveying system is installed between the first buffer hopper and the second buffer hopper. A second negative pressure pneumatic conveying system is installed between the jet mill and the ultrasonic vibrating bin. A big bag packing machine is installed at the discharge end of the finished product bin.
[0007] Preferably, a first pipeline type iron remover is fixed at the input end of the centrifuge. A second pipeline type iron remover is assembled between the jacketed cooling screw and the first buffer hopper. A third pipeline type iron remover is assembled between the second buffer hopper and the jet mill. A fourth pipeline type iron remover is assembled between the ultrasonic vibrating bin and the finished product bin.
[0008] Preferably, the first negative-pressure pneumatic conveying system includes an acceleration chamber connected to the discharge end of the first buffer hopper and a first dust collector. A first negative-pressure conveying pipeline is connected between the acceleration chamber and the first dust collector, and a first negative-pressure Roots blower is assembled at the air outlet end of the first dust collector.
[0009] Preferably, a first rotary feeder is fixed on the surface of the discharge pipe of the first dust collector.
[0010] Preferably, an air filter is installed inside the acceleration chamber.
[0011] Preferably, the second negative-pressure pneumatic conveying system includes a second dust collector. A second negative-pressure conveying pipeline is connected between the second dust collector and the air outlet end of the airflow crusher, and a second negative-pressure Roots blower is assembled at the air outlet end of the second dust collector.
[0012] Preferably, a second rotary feeder is fixed on the surface of the discharge pipe of the second dust collector.
[0013] Preferably, the recovery unit includes a third dust collector. A smoke exhaust inlet and a smoke exhaust outlet are provided on the side wall of the third dust collector. A smoke exhaust pipe is fixed between the smoke exhaust inlet and the smoke exhaust port of the electro-heated rotary dryer, a tail gas blower is fixed at the smoke exhaust outlet, and a dust collection box is fixed at the bottom discharge end of the third dust collector.
[0014] Preferably, a third rotary feeder is fixed on the surface of the discharge pipe of the first buffer hopper.
[0015] Preferably, a circulating water inlet pipe and a circulating water return pipe are connected to the surface of the jacketed cooling screw.
[0016] The beneficial effects of the present utility model are as follows: the process flow is reasonable, the operability is high, the equipment versatility is strong, the continuous production stability is high, the product quality is high, and it meets the requirements of the battery-grade lithium carbonate industry standard. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic structural diagram of a lithium carbonate extraction production line proposed by the present utility model.
[0018] In the figure: 1. First pipeline type magnetic separator; 2. Centrifuge; 3. Double-shaft screw conveyor; 4. Electric heating rotary dryer; 5. Third dust collector; 6. Exhaust gas fan; 7. Jacketed cooling screw; 8. Second pipeline type magnetic separator; 9. First buffer hopper; 10. Third rotary feeder; 11. Air filter; 12. Acceleration chamber; 13. First negative pressure conveying pipeline; 14. First dust collector; 15. First negative pressure Roots blower; 16. First rotary feeder; 17. Second buffer hopper; 18. Third pipeline type magnetic separator; 19. Jet mill; 20. Second negative pressure conveying pipeline; 21. Second dust collector; 22. Second negative pressure Roots blower; 23. Second rotary feeder; 24. Ultrasonic vibrating screen; 25. Fourth pipeline type magnetic separator; 26. Finished product bin; 27. Big bag packing machine. Specific embodiments
[0019] Referring to Figure 1 , the lithium carbonate extraction production line includes a centrifuge 2, an electric heating rotary dryer 4, a first buffer hopper 9, a second buffer hopper 17, a jet mill 19, an ultrasonic vibrating bin and a finished product bin. A double-shaft screw conveyor 3 is assembled between the centrifuge 2 and the electric heating rotary dryer 4. The smoke exhaust end of the electric heating rotary dryer 4 is connected with a recovery unit. The discharge end of the electric heating rotary dryer 4 is connected with a jacketed cooling screw 7. The output end of the jacketed cooling screw 7 is connected with a first buffer hopper 9. A first negative pressure pneumatic conveying system is installed between the first buffer hopper 9 and the second buffer hopper 17. A second negative pressure pneumatic conveying system is installed between the jet mill 19 and the ultrasonic vibrating bin. A big bag packing machine 27 is installed at the discharge end of the finished product bin.
[0020] A first pipeline type magnetic separator 1 is fixed at the input end of the centrifuge 2. A second pipeline type magnetic separator 8 is assembled between the jacketed cooling screw 7 and the first buffer hopper 9. A third pipeline type magnetic separator 18 is assembled between the second buffer hopper 17 and the jet mill 19. A fourth pipeline type magnetic separator 25 is assembled between the ultrasonic vibrating bin and the finished product bin.
[0021] The first negative pressure pneumatic conveying system includes an acceleration chamber 12 and a first dust collector 14 that are connected to the discharge end of the first buffer hopper 9. A first negative pressure conveying pipeline 13 is connected between the acceleration chamber 12 and the first dust collector 14. A first negative pressure Roots blower 15 is assembled at the air outlet end of the first dust collector 14.
[0022] A first rotary feeder 16 is fixed on the surface of the discharge pipe of the first dust collector 14.
[0023] An air filter 11 is installed inside the acceleration chamber 12.
[0024] The second negative-pressure pneumatic conveying system includes a second dust collector 21. A second negative-pressure conveying pipeline 20 is connected between the air outlet end of the second dust collector 21 and the air outlet end of the airflow pulverizer 19. A second negative-pressure Roots blower 22 is assembled at the air outlet end of the second dust collector 21.
[0025] A second rotary feeder 23 is fixed on the surface of the discharge pipe of the second dust collector 21.
[0026] The recovery unit includes a third dust collector 5. A smoke exhaust inlet and a smoke exhaust outlet are provided on the side wall of the third dust collector 5. A smoke exhaust pipe is fixed between the smoke exhaust inlet and the smoke exhaust port of the electrically heated rotary dryer 4. A tail gas fan 6 is fixed at the smoke exhaust outlet. A dust collection box is fixed at the bottom discharge end of the third dust collector 5.
[0027] A third rotary feeder 10 is fixed on the surface of the discharge pipe of the first buffer hopper 9.
[0028] A circulating water inlet pipe and a circulating return pipe are connected to the surface of the jacketed cooling screw 7.
[0029] When the device is in use, it is divided into the following steps:
[0030] S1: The lithium carbonate solid-liquid mixture from the upstream section enters the first centrifugal dehydration process after removing magnetic substances through the first pipe-type magnetic separator 1. After preliminary dehydration by the centrifuge 2, the water content of the lithium carbonate solid-liquid mixture is about 8-10%.
[0031] S2: The solid lithium carbonate at the outlet of the centrifuge 2 falls into the double-shaft screw conveyor 3 and is transported to the inlet of the electrically heated rotary dryer 4 to start the second drying process. The solid lithium carbonate is dried by the electrically heated rotary dryer 4 to a water content of less than 0.2%. The dried tail gas is discharged after being treated up to standard by the dust collector 5 and the tail gas fan 6. The lithium carbonate dust entrained in the tail gas is collected at the bottom of the dust collector 5.
[0032] S3: The lithium carbonate at the outlet of the electrically heated rotary dryer 4 falls into the jacketed cooling screw to enter the third cooling process. The solid lithium carbonate is cooled to below 50°C after this process.
[0033] S4: The cooled solid lithium carbonate falls into the first buffer hopper 9 after removing magnetic substances through the second pipe-type magnetic separator 8, and pneumatic conveying is set at the outlet of the first buffer hopper 9 as the fourth process.
[0034] S5: The pneumatic conveying in the fourth process adopts the negative-pressure dilute-phase conveying method, including the first negative-pressure Roots blower 15, the first dust collector 14, the first negative-pressure conveying pipeline 13, the acceleration chamber 12, the air filter 11, and the third rotary feeder 10. The first negative-pressure Roots blower 15 creates a negative pressure in the first negative-pressure conveying pipeline 13. The solid lithium carbonate is conveyed through the first negative-pressure conveying pipeline 13 to the first dust collector 14. The solid lithium carbonate is collected by the first dust collector 14, and the tail gas is exhausted through the first negative-pressure Roots blower 15.
[0035] S6: A first rotary feeder 16 is arranged below the first dust collector 14. The solid lithium carbonate is fed through the first rotary feeder 16 to the second buffer hopper 17. A third pipe-type magnetic separator 18 is arranged below the second buffer hopper 17. After the magnetic substances are removed by the third pipe-type magnetic separator 18, it enters the airflow pulverization in the fifth process.
[0036] S7: A classification area is arranged above the airflow pulverizer 19. The solid lithium carbonate is pulverized by the airflow pulverizer 19 to the qualified particle size of battery-grade lithium carbonate and then enters the pneumatic conveying in the sixth process.
[0037] S8: The pneumatic conveying in the sixth process adopts the negative-pressure dilute-phase conveying method, including the second negative-pressure Roots blower 22, the second dust collector 21, and the second negative-pressure conveying pipeline 20. The second negative-pressure Roots blower 22 creates a negative pressure in the second negative-pressure conveying pipeline 20. The solid lithium carbonate is conveyed through the second negative-pressure conveying pipeline 20 to the second dust collector 21. The solid lithium carbonate is collected by the second dust collector 21, and the tail gas is exhausted through the second negative-pressure Roots blower 22.
[0038] S9: A second rotary feeder 23 is arranged below the second dust collector 21. The battery-grade lithium carbonate is fed through the second rotary feeder 23 into the seventh process of screening. The screening machine uses an ultrasonic vibrating screen 24 to remove large particles and impurities remaining in the previous process.
[0039] S10: A fourth pipe-type magnetic separator 25 is arranged at the outlet of the ultrasonic vibrating screen 24. After the magnetic substances are removed by the fourth pipe-type magnetic separator 25, it falls into the finished product bin 26. The last process of packaging is arranged below the finished product bin 26. The packaging of the finished battery-grade lithium carbonate adopts the form of a large bag packaging machine 27.
[0040] The double-shaft screw conveyor 3 and the jacketed cooling screw used in Step 2 and Step 3 are both made of 304 stainless steel, and the inner wall of the shell, the conveying screw shaft and the blades are all evenly sprayed with tungsten carbide to prevent magnetic substance contamination.
[0041] The electric heating rotary drying kiln used in Step 2 is in an indirect heating mode. The cylinder is heated by the thermocouple, and the lithium carbonate is dried by the heated cylinder.
[0042] The cooling equipment used in Step 3 is in the form of a cooling conveyor screw. The traditional method is to set up a cooling section rotary kiln at the discharge end of the rotary kiln. The form of the cooling screw equipment occupies less land and has high efficiency.
[0043] The pneumatic conveying forms used in Step 5 and Step 8 are both negative pressure dilute phase conveying. A negative pressure is formed by a Roots blower. The material of the conveying pipeline is 304 stainless steel lined with ceramics. For short conveying distances, a steel wire composite polymer hose can also be used. The conveying air needs to be clean air.
[0044] The filter material of the dust collector used in Step 5 and Step 8 is a sintered plate. The dust emission concentration can be made less than 5 mg / Nm3, and it is not easily damaged, avoiding product contamination caused by the easy breakage and hair loss of the filter bags of traditional bag filters.
[0045] The main structure of the jet mill 19 used in Step 7 is protected by ceramics, and magnetic substance contamination is eliminated during the production process.
[0046] The rotary feed valves used in Step 5, Step 6, and Step 9 are of a highly airtight form, and the material is selected as a hard polymer material to avoid magnetic substance contamination.
[0047] The screening machine form used in Step 9 is an ultrasonic vibrating screen 24, which has higher screening efficiency and is suitable for screening ultra-fine powder materials.
[0048] Pipeline type electromagnetic separators are set at key process points, which can effectively prevent the increase of magnetic substances in the process flow and improve product quality.
[0049] In Step 10, the feeding of the packaging machine adopts the method of vertical screw feeding.
[0050] In the entire post-treatment process flow of lithium carbonate solid, the chute pipes connecting equipment to equipment are all made of high molecular hard plates or high molecular hard plates, which can effectively prevent the increase of magnetic substances in the process flow and improve product quality.
[0051] Setting the screening process after the jet milling process and before the last process of packaging can effectively prevent the increase of magnetic substances in the process flow and improve product quality.
[0052] In the entire post-treatment process flow of lithium carbonate solid, the buffer hoppers and finished product bins are all made of 304 stainless steel sprayed with tungsten carbide inside, which can effectively prevent the increase of magnetic substances in the process flow and improve product quality.
Claims
1. Lithium carbonate extraction production line, characterized by: It includes a centrifuge, an electric heating rotary drying kiln, a first buffer hopper, a second buffer hopper, an air flow pulverizer, an ultrasonic vibration bin and a finished product bin. A double-axis screw conveyor is installed between the centrifuge and the electric heating rotary drying kiln. The smoke exhaust end of the electric heating rotary drying kiln is connected to a recovery unit. The discharge end of the electric heating rotary drying kiln is connected to a jacketed cooling spiral. The output end of the jacketed cooling spiral is connected to the first buffer hopper. A first negative pressure pneumatic conveying system is installed between the first buffer hopper and the second buffer hopper. A second negative pressure pneumatic conveying system is installed between the air flow pulverizer and the ultrasonic vibration bin. A large bag packaging machine is installed at the discharge end of the finished product bin.
2. The lithium carbonate extraction production line according to claim 1, characterized in that: A first pipeline iron remover is fixed to the input end of the centrifuge, a second pipeline iron remover is installed between the jacketed cooling spiral and the first buffer hopper, a third pipeline iron remover is installed between the second buffer hopper and the air flow mill, and a fourth pipeline iron remover is installed between the ultrasonic vibration bin and the finished product bin.
3. The lithium carbonate extraction production line according to claim 1, characterized in that: The first negative pressure pneumatic conveying system includes an acceleration chamber connected to the discharge end of the first buffer hopper and a first dust collector, a first negative pressure conveying pipeline is connected between the acceleration chamber and the first dust collector, and a first negative pressure Roots blower is installed at the air outlet end of the first dust collector.
4. The lithium carbonate extraction production line according to claim 3, characterized in that: A first rotary feeding valve is fixed on the surface of the discharge pipe of the first dust collector.
5. The lithium carbonate extraction production line according to claim 3, characterized in that: An air filter is installed inside the acceleration chamber.
6. The lithium carbonate extraction production line according to claim 1, characterized in that: The second negative pressure pneumatic conveying system includes a second dust collector, a second negative pressure conveying pipeline is connected between the second dust collector and the air outlet end of the air flow pulverizer, and the air outlet end of the second dust collector is equipped with a second negative pressure Roots blower.
7. The lithium carbonate extraction production line according to claim 6, characterized in that: A second rotary feeding valve is fixed on the surface of the discharge pipe of the second dust collector.
8. The lithium carbonate extraction production line according to claim 1, characterized in that: The recovery unit includes a third dust collector, a side wall of which is provided with a smoke exhaust inlet and a smoke exhaust outlet, a smoke exhaust pipe is fixed between the smoke exhaust inlet and the smoke exhaust outlet of the electric heating rotary drying kiln, an exhaust fan is fixed to the smoke exhaust outlet, and a dust collection box is fixed to the bottom discharge end of the third dust collector.
9. The lithium carbonate extraction production line according to claim 1, characterized in that: A third rotary feeding valve is fixed on the surface of the discharge pipe of the first buffer hopper.
10. The lithium carbonate extraction production line according to claim 1, characterized in that: The surface of the jacketed cooling spiral is connected with a circulating water inlet pipe and a circulating water return pipe.