A high-purity lithium sulfide preparation system

Abstract

This utility model relates to the field of lithium sulfide production technology, specifically a high-purity lithium sulfide preparation system. It includes: a material mixing unit; the outlet of the material mixing unit is connected to the inlet of a heating and drying unit; the outlet of the heating and drying unit is connected to the inlet of a fine crushing unit; the outlet of the fine crushing unit is connected to the inlet of a calcining unit; the outlet of the calcining unit is connected to the inlet of a dispersing unit; the outlet of the dispersing unit is connected to the inlet of a processing unit; the material mixing unit, heating and drying unit, fine crushing unit, calcining unit, dispersing unit, and processing unit are all connected to an inert atmosphere conveying device. This utility model, through the organic connection of the material mixing unit, heating and drying unit, fine crushing unit, calcining unit, dispersing unit, and processing unit, constructs a complete high-purity lithium sulfide production line, significantly improving production efficiency and product consistency, and is suitable for large-scale industrial production.

Description

Technical Field

[0001] This utility model relates to the field of lithium sulfide production technology, specifically a high-purity lithium sulfide preparation system. Background Technology

[0002] In recent years, the rapid development of emerging technologies such as new energy electric vehicles, energy storage systems, and drones has led to a surge in market demand for high-performance lithium batteries. Traditional liquid batteries have numerous limitations in terms of safety and energy density, necessitating a new battery manufacturing technology to meet industry demands. Solid-state batteries use a solid electrolyte to replace the flammable liquid electrolyte in traditional lithium batteries, effectively reducing the risk of thermal runaway. Furthermore, compatibility with metallic lithium anodes significantly increases battery energy density. Due to their substantial advantages in safety and energy density, solid-state batteries have become a crucial direction for battery technology development.

[0003] Sulfide solid electrolytes, as a key component of solid-state batteries, have become the most promising technological route due to their excellent ionic conductivity and stable electrochemical performance. Lithium sulfide (Li2S), a key raw material for the production of sulfide solid electrolytes, is prone to reaction with air and water, increasing the difficulty of production and hindering large-scale production, thus affecting the development of sulfide solid electrolytes.

[0004] Utility model patent CN220027004U discloses a lithium sulfide synthesis and purification system, including a raw material silo, a dissolving tank, a reactor, a solid-liquid separation device, a buffer tank, a solution preheater, a nitrogen-environment closed-loop spray drying system, and washing, filtering, and drying equipment, all connected in sequence. It may also include a reaction solvent circulation system and a detergent purification and recycling system. While the above patent can purify lithium sulfide, the washing solvents used are mostly flammable, explosive, and volatile, and they also easily introduce moisture, resulting in poor product quality. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a high-purity lithium sulfide preparation system to improve the production efficiency of lithium sulfide and improve product quality.

[0006] The technical solution adopted by this utility model to solve its technical problem is a high-purity lithium sulfide preparation system, comprising: The material mixing unit is used to stir and mix the sulfur source, lithium source and reducing agent under an inert atmosphere to form a mixed slurry; The discharge port of the material mixing unit is connected to the inlet of the heating and drying unit. The heating and drying unit is used to heat and dry the mixed slurry under an inert atmosphere to produce crude lithium sulfide. The outlet of the heating and drying unit is connected to the inlet of the fine crushing unit, which is used to finely crush the dried crude lithium sulfide to the target particle size under an inert atmosphere. The discharge port of the fine crushing unit is connected to the feed port of the calcining unit. The calcining unit is used to calcine crude lithium sulfide at high temperature in an inert atmosphere to form refined lithium sulfide. The discharge port of the calcination unit is connected to the inlet of the dispersing unit, which is used to disperse the high-quality lithium sulfide. The discharge port of the dispersing unit is connected to the inlet of the processing unit. The processing unit is used to demagnetize the dispersed high-quality lithium sulfide and package it to form lithium sulfide products. The material mixing unit, heating and drying unit, fine crushing unit, calcination unit, dispersing unit, and processing unit are all connected to the inert atmosphere conveying device.

[0007] Furthermore, the material mixing unit includes a lithium source silo, a sulfur source silo, and a reducing agent storage tank; both the lithium source silo and the sulfur source silo are equipped with automatic weighing devices; the outlets of the lithium source silo, the sulfur source silo, and the reducing agent storage tank are connected to the inlet of the mixing kettle; the outlet of the mixing kettle is connected to the inlet of the mixing buffer tank.

[0008] Furthermore, the heating and drying unit includes a drying device connected to the outlet of the mixing buffer tank; the drying device is equipped with a heating device and a cooling device.

[0009] Furthermore, the drying device is one of a rake dryer or a vertical stirring dryer; the heating device is one of a heat transfer oil refueling system, a steam heating system, or an electric heating system; and the cooling device is one of a rake dryer or a vertical stirring dryer.

[0010] Furthermore, the fine crushing unit includes a conveying device connected to the discharge port of the drying device, the discharge port of the conveying device being connected to the inlet of the fine crushing device, and the discharge port of the fine crushing device being connected to the inlet of the solid demagnetizing device.

[0011] Furthermore, the conveying device is one of a shafted screw conveyor, a shaftless screw conveyor, or a vibrating feeder; the fine crushing device is one of a flat air jet mill, a counter-jet air jet mill, a target air jet mill, or a fluidized bed air jet mill; and the solid demagnetizing device is one of a rotary permanent magnet separator, a drawer-type permanent magnet separator, or an electromagnetic separator.

[0012] Furthermore, the fine crushing device is equipped with at least one of a cyclone separator, a bag filter, and a metal membrane filter.

[0013] Furthermore, the calcination unit includes a buffer silo connected to the outlet of the solid demagnetizing device, the outlet of the buffer silo being connected to the inlet of the conveying device, the outlet of the conveying device being connected to the inlet of the high-temperature calcining device, and the outlet of the high-temperature calcining device being connected to the inlet of the cooling buffer device.

[0014] Furthermore, the conveying device is one of a shafted screw conveyor or a shaftless screw conveyor; the high-temperature calcination device is one of a rotary kiln, a roller kiln, or a batch furnace; the cooling buffer device is one of a metal silo with a cooling system or a non-metallic silo with a cooling system, and the cooling system is one of oil cooling, water cooling, or air cooling.

[0015] Furthermore, the cooling buffer device is equipped with a circulation channel connected to the buffer silo, and the cooling buffer device is equipped with a sampling port. When the material in the cooling buffer device passes the inspection, it enters the next step of the dispersing unit; if the result is unqualified, it is transported to the buffer silo through the circulation channel.

[0016] Furthermore, the high-temperature calcination device is equipped with either a bag filter or a metal membrane filter.

[0017] Furthermore, the dispersing unit includes an output device connected to the outlet of the cooling buffer device, the outlet of the output device being connected to the inlet of the dispersing device, and the outlet of the dispersing device being connected to the inlet of the material buffer silo.

[0018] Furthermore, the output device is one of a shafted screw conveyor, a shaftless screw conveyor, or a vibrating feeder; the dispersing device is one of a mechanical crusher, a rod mill, or a vortex mill; and the material buffer silo is one of a metal silo or a non-metal silo.

[0019] Furthermore, the processing unit includes a demagnetizing device connected to the outlet of the material buffer bin, the outlet of the demagnetizing device being connected to the inlet of the buffer device, and the outlet of the buffer device being connected to the packaging device.

[0020] Furthermore, the demagnetizing device is one of a rotary permanent magnet separator, a drawer-type permanent magnet separator, or an electromagnetic separator; the buffer device is one of a metal silo or a non-metal silo; and the packaging device is a packaging machine.

[0021] The beneficial effects of this utility model are: 1. The system constructs a complete high-purity lithium sulfide production line by organically connecting the material mixing unit, heating and drying unit, fine crushing unit, calcination unit, dispersing unit and processing unit, which greatly improves production efficiency and product consistency and is suitable for large-scale industrial production.

[0022] 2. A fine crushing unit is added before the calcination unit to crush the crude lithium sulfide to the target particle size, which increases the specific surface area and facilitates the efficient removal of impurities, especially volatile impurities and solid impurities, during the subsequent calcination process, thus significantly improving the purity and calcination efficiency of the product.

[0023] 3. The process of "fine crushing before calcination + dispersing after calcination" avoids the problems of residual moisture and secondary pollution caused by traditional wet washing, ensuring the high purity and stability of the lithium sulfide product.

[0024] 4. Solid demagnetizing devices are installed after fine crushing and before final packaging to effectively remove magnetic foreign objects from the material, avoid their adverse effects on the electrochemical performance of battery materials, and improve the reliability and applicability of lithium sulfide products.

[0025] 5. Various unit equipment options are available, such as drying devices, crushing devices, and calcining devices, which can be selected according to actual needs. The system can also achieve rework processing when materials are unqualified through the circulation channel, which improves production flexibility and product qualification rate. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of this utility model.

[0027] Reference numerals in the attached diagram: 1-Inert atmosphere conveying device; 2-Lithium source silo; 3-Sulfur source silo; 4-Reducing agent storage tank; 5-Automatic weighing device; 6-Mixing kettle; 7-Drying device; 8-Heating device; 9-Conveying device; 10-Fine crushing device; 11-Solid demagnetizing device; 12-Buffer silo; 13-Conveying device; 14-High temperature calcining device; 15-Cooling buffer device; 16-Circulation channel; 17-Sampling port; 18-Output device; 19-Dispersing device; 20-Material buffer silo; 21-Demagnetizing device; 22-Buffer device; 23-Packaging device; 24-Mixing buffer tank; 25-Cooling device. Detailed Implementation

[0028] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0029] like Figure 1 As shown, this utility model discloses a high-purity lithium sulfide preparation system, comprising: The material mixing unit is used to stir and mix the sulfur source, lithium source and reducing agent under an inert atmosphere to form a mixed slurry; The discharge port of the material mixing unit is connected to the inlet of the heating and drying unit. The heating and drying unit is used to heat and dry the mixed slurry under an inert atmosphere to produce crude lithium sulfide. The outlet of the heating and drying unit is connected to the inlet of the fine crushing unit, which is used to finely crush the dried crude lithium sulfide to the target particle size under an inert atmosphere. The discharge port of the fine crushing unit is connected to the feed port of the calcining unit. The calcining unit is used to calcine crude lithium sulfide at high temperature in an inert atmosphere to form refined lithium sulfide. The discharge port of the calcination unit is connected to the inlet of the dispersing unit, which is used to disperse the high-quality lithium sulfide. The discharge port of the dispersing unit is connected to the inlet of the processing unit. The processing unit is used to demagnetize the dispersed high-quality lithium sulfide and package it to form lithium sulfide products. The material mixing unit, heating and drying unit, fine crushing unit, calcination unit, dispersing unit, and processing unit are all connected to the inert atmosphere conveying device 1. The inert atmosphere conveying device 1 is used to convey argon or nitrogen into the material mixing unit, heating and drying unit, fine crushing unit, calcination unit, dispersing unit, and processing unit to form an inert atmosphere.

[0030] Furthermore, the material mixing unit includes a lithium source silo 2, a sulfur source silo 3, and a reducing agent storage tank 4; both the lithium source silo 2 and the sulfur source silo 3 are equipped with automatic weighing devices 5, and the outlets of the lithium source silo 2, the sulfur source silo 3, and the reducing agent storage tank 4 are connected to the inlet of the mixing kettle 6; the outlet of the mixing kettle 6 is connected to the inlet of the mixing buffer tank 24.

[0031] The material mixing unit is used to achieve precise proportioning and uniform mixing of raw materials. Lithium sources include lithium hydroxide, and sulfur sources include sulfur. The lithium and sulfur sources are stored in lithium source silos 2 and 3, respectively, and are accurately weighed by an automatic weighing device 5 to ensure the raw material proportions meet process requirements and avoid human error. The reducing agent includes hydrogen or carbon materials, and is supplied as needed from the reducing agent storage tank 4. The weighed raw materials and reducing agent are fed into the mixing vessel 6 in batches, where they form a uniform slurry under stirring. The mixing buffer tank 24 is used to temporarily store the mixed slurry, ensuring continuous supply to subsequent processes.

[0032] Furthermore, the heating and drying unit includes a drying device 7 connected to the outlet of the mixing buffer tank 24; the drying device 7 is equipped with a heating device 8 and a cooling device 25. The mixed slurry is conveyed from the mixing buffer tank 24 to the drying device 7, which is either a rake dryer or a vertical stirring dryer. The drying device 7 is equipped with a heating device 8, which is a heat transfer oil system, a steam heating system, or an electric heating system, to provide a heat source to evaporate the volatile components in the slurry, generating crude lithium sulfide. The dried material is cooled by the cooling device 25, which is either a rake dryer with a cooling structure or a vertical stirring dryer with a cooling structure, to prevent sintering or oxidation of the material in subsequent processing by cooling. It should be noted that the drying device 7 and the cooling device 25 can be implemented by a single device, such as a rake dryer or a vertical stirring dryer with a cooling structure.

[0033] Furthermore, the drying device 7 is one of a rake dryer or a vertical stirring dryer; the heating device 8 is one of a heat transfer oil refueling system, a steam heating system, or an electric heating system; and the cooling device 25 is one of a rake dryer or a vertical stirring dryer.

[0034] Furthermore, the fine crushing unit includes a conveying device 9 connected to the outlet of the drying device 7. The outlet of the conveying device 9 is connected to the inlet of the fine crushing device 10, and the outlet of the fine crushing device 10 is connected to the inlet of the solid demagnetizing device 11. The cooled crude lithium sulfide is fed into the fine crushing device 10 via the conveying device 9. The conveying device 9 can be a shafted / shaftless screw conveyor, and the fine crushing device 10 can be a flat air jet mill, a counter-jet air jet mill, a target air jet mill, or a fluidized bed air jet mill. The fine crushing device 10 crushes the material to the target particle size through high-speed airflow or mechanical action, increasing the specific surface area and facilitating the thorough removal of impurities during subsequent calcination. The crushed material undergoes gas-solid separation and dust collection via at least one of a cyclone separator, a bag filter, or a metal membrane dust collector. Subsequently, the material enters the solid demagnetizing device 11 to initially remove any magnetic foreign matter that may be introduced. The solid demagnetizing device 11 can be a rotary permanent magnet separator, a drawer-type permanent magnet separator, or a drawer-type electromagnetic separator.

[0035] Furthermore, the conveying device 9 is one of a shafted screw conveyor, a shaftless screw conveyor, or a vibrating feeder; the fine crushing device 10 is one of a flat air jet mill, a counter-jet air jet mill, a target air jet mill, or a fluidized bed air jet mill; and the solid demagnetizing device 11 is one of a rotary permanent magnet separator, a drawer-type permanent magnet separator, or an electromagnetic separator.

[0036] Furthermore, the fine crushing device 10 is equipped with at least one of a cyclone separator, a bag filter, and a metal membrane filter.

[0037] Furthermore, the calcination unit includes a buffer silo 12 connected to the outlet of the solid demagnetizing device 11. The outlet of the buffer silo 12 is connected to the inlet of the conveying device 13, the outlet of the conveying device 13 is connected to the inlet of the high-temperature calcining device 14, and the outlet of the high-temperature calcining device 14 is connected to the inlet of the cooling buffer device 15. The demagnetized material enters the buffer silo 12 and then enters the high-temperature calcining device 14 via the conveying device 13. The conveying device 13 can be a shafted screw conveyor or a shaftless screw conveyor, and the high-temperature calcining device 14 can be a rotary kiln, a roller kiln, or a batch furnace. Under conditions of 350–500℃ and an inert atmosphere, residual volatile impurities and organic residues in the material are completely decomposed and removed, while simultaneously promoting the optimization and purification of the lithium sulfide crystal structure. The high-temperature material after calcination enters the cooling buffer device 15 for cooling. The cooling buffer device 15 is equipped with a sampling port 17 and a circulation channel 16: after cooling, samples are taken for testing, and qualified materials enter the next process; unqualified materials are returned to the calcining device for reprocessing to ensure product quality.

[0038] Furthermore, the conveying device 13 is one of a shafted screw conveyor or a shaftless screw conveyor; the high-temperature calcining device 14 is one of a rotary kiln, a roller kiln, or a batch furnace; the cooling buffer device 15 is one of a metal silo with a cooling system or a non-metal silo with a cooling system, and the cooling system is one of oil cooling, water cooling, or air cooling.

[0039] Furthermore, the cooling buffer device 15 is provided with a circulation channel 16 connected to the high-temperature calcination device 14, and the cooling buffer device 15 is provided with a sampling port 17. When the material in the cooling buffer device 15 passes the inspection, it enters the next step of the dispersing unit; if the result is not qualified, it is transported to the buffer silo 12 through the circulation channel 16.

[0040] Furthermore, the high-temperature calcination device 14 is equipped with either a bag filter or a metal membrane filter.

[0041] Furthermore, the dispersing unit includes an output device 18 connected to the outlet of the cooling buffer device 15. The outlet of the output device 18 is connected to the inlet of the dispersing device 19, and the outlet of the dispersing device 19 is connected to the inlet of the material buffer silo 20. The cooled calcined material may have slight sintering, which needs to be dispersed by the dispersing device 19 to restore the material's flowability and uniformity. The dispersing device 19 can be a mechanical pulverizer, a rod mill, or a vortex mill. The dispersed material is temporarily stored in the material buffer silo 20 in preparation for subsequent packaging.

[0042] Furthermore, the output device 18 is one of a shafted screw conveyor, a shaftless screw conveyor, or a vibrating feeder; the dispersing device 19 is one of a mechanical crusher, a pin mill, a vortex mill, or a Raymond mill; and the material buffer bin 20 is one of a metal bin or a non-metal bin.

[0043] Furthermore, the processing unit includes a demagnetizing device 21 connected to the outlet of the material buffer silo 20. The outlet of the demagnetizing device 21 is connected to the inlet of the buffer device 22, and the outlet of the buffer device 22 is connected to the packaging device 23. After the material is output from the buffer silo 20, it enters the demagnetizing device 21 for final demagnetization treatment to completely remove magnetic foreign matter and avoid its impact on the electrochemical performance of the battery material. The demagnetizing device 21 can be a rotary permanent magnet separator, a drawer-type permanent magnet separator, or a drawer-type electromagnetic separator. The demagnetized material is temporarily stored in the buffer device 22 and finally sealed and packaged by the packaging machine (packing device 23) to obtain high-purity lithium sulfide finished product.

[0044] Furthermore, the demagnetizing device 21 is one of a rotary permanent magnet separator, a drawer-type permanent magnet separator, or a drawer-type electromagnetic separator; the buffer device 22 is one of a metal silo or a non-metal silo; and the packaging device 23 is a packaging machine.

[0045] The specific operation process of this utility model is as follows: Material mixing: The lithium source, sulfur source, and reducing agent are weighed proportionally from the lithium source silo 2, sulfur source silo 3, and reducing agent storage tank 4 respectively by the automatic weighing device 5, and then fed into the mixing kettle 6. The mixture is stirred and mixed under an inert atmosphere to form a homogeneous slurry. The mixed slurry is temporarily stored in the mixing buffer tank 24 for later use.

[0046] Heating and drying: The mixed slurry is conveyed from the mixing buffer tank 24 to the drying unit 7, where it is dried under the heat provided by the heating unit 8 to remove volatile components and produce crude lithium sulfide. After drying, the material is cooled by the cooling unit 25 and then enters the next unit.

[0047] Fine crushing and demagnetization: The cooled crude lithium sulfide is fed into the fine crushing unit 10 via the conveying device 9, where it is crushed to the target particle size under an inert atmosphere. The D50 of the small particle size product is approximately 2-3 μm, and the D50 of the large particle size product is approximately 10-15 μm. After being collected by a cyclone separator or a bag filter, the crushed material enters the solid demagnetizing unit 11 for preliminary demagnetization treatment. After demagnetization is completed, the material enters the buffer silo 12.

[0048] High-temperature calcination: The demagnetized material is fed into the high-temperature calcination device 14 via the conveyor 13, where it is calcined at 350–500℃ in an inert atmosphere to further remove volatile impurities and improve crystallinity, forming high-quality lithium sulfide. The gas generated during the calcination process is treated by a dust collector and then introduced into the tail gas treatment device.

[0049] Cooling and Quality Inspection: The calcined material enters the cooling buffer device 15 for cooling. After cooling, it can be sampled and tested through the sampling port 17. If it passes the test, it enters the next unit; if it fails the test, it is returned to the buffer silo 12 through the circulation channel 16 for reprocessing.

[0050] Dispersion and buffering: Qualified materials are sent to the dispersion device 19 via the output device 18 to disperse the particles that have been slightly sintered due to calcination and restore their fluidity. The dispersed materials are temporarily stored in the material buffer silo 20.

[0051] Final demagnetization and packaging: The material is demagnetized from the buffer silo 20 through the demagnetizing device 21 to ensure that there are no magnetic foreign objects. Then it is temporarily stored in the buffer device 22 and finally packaged by the packaging machine (packing device 23) to obtain high-purity lithium sulfide finished product.

[0052] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A high-purity lithium sulfide preparation system, characterized in that, include: The material mixing unit is used to stir and mix the sulfur source, lithium source and reducing agent under an inert atmosphere to form a mixed slurry; The discharge port of the material mixing unit is connected to the inlet of the heating and drying unit. The heating and drying unit is used to heat and dry the mixed slurry under an inert atmosphere to produce crude lithium sulfide. The outlet of the heating and drying unit is connected to the inlet of the fine crushing unit, which is used to finely crush the dried crude lithium sulfide to the target particle size under an inert atmosphere. The discharge port of the fine crushing unit is connected to the feed port of the calcining unit. The calcining unit is used to calcine crude lithium sulfide at high temperature in an inert atmosphere to form refined lithium sulfide. The discharge port of the calcination unit is connected to the inlet of the dispersing unit, which is used to disperse the high-quality lithium sulfide. The discharge port of the dispersing unit is connected to the inlet of the processing unit. The processing unit is used to demagnetize the dispersed high-quality lithium sulfide and package it to form lithium sulfide products. The material mixing unit, heating and drying unit, fine crushing unit, calcination unit, dispersing unit and processing unit are all connected to the inert atmosphere conveying device (1).

2. The high-purity lithium sulfide preparation system according to claim 1, characterized in that, The material mixing unit includes a lithium source silo (2), a sulfur source silo (3), and a reducing agent storage tank (4); both the lithium source silo (2) and the sulfur source silo (3) are equipped with automatic weighing devices (5); the outlets of the lithium source silo (2), the sulfur source silo (3), and the reducing agent storage tank (4) are connected to the inlet of the mixing kettle (6); the outlet of the mixing kettle (6) is connected to the inlet of the mixing buffer tank (24).

3. The high-purity lithium sulfide preparation system according to claim 2, characterized in that, The heating and drying unit includes a drying device (7) connected to the outlet of the mixing buffer tank (24); the drying device (7) is equipped with a heating device (8) and a cooling device (25).

4. The high-purity lithium sulfide preparation system according to claim 3, characterized in that, The drying device (7) is one of a rake dryer or a vertical stirring dryer; the heating device (8) is one of a heat transfer oil refueling system, a steam heating system, or an electric heating system; the cooling device (25) is one of a rake dryer or a vertical stirring dryer.

5. The high-purity lithium sulfide preparation system according to claim 3, characterized in that, The fine crushing unit includes a conveying device (9) connected to the discharge port of the drying device (7), the discharge port of the conveying device (9) is connected to the feed port of the fine crushing device (10), and the discharge port of the fine crushing device (10) is connected to the feed port of the solid demagnetizing device (11).

6. The high-purity lithium sulfide preparation system according to claim 5, characterized in that, The conveying device (9) is one of a shafted screw conveyor, a shaftless screw conveyor, or a vibrating feeder; the fine crushing device (10) is one of a flat air jet mill, a jet-type air jet mill, a target-type air jet mill, or a fluidized bed air jet mill; the solid demagnetizing device (11) is one of a rotary permanent magnet separator, a drawer-type permanent magnet separator, or an electromagnetic separator.

7. The high-purity lithium sulfide preparation system according to claim 5, characterized in that, The fine crushing device (10) is equipped with at least one of a cyclone separator, a bag filter, and a metal membrane filter.

8. The high-purity lithium sulfide preparation system according to claim 5, characterized in that, The calcination unit includes a buffer silo (12) connected to the outlet of the solid demagnetizing device (11). The outlet of the buffer silo (12) is connected to the inlet of the conveying device (13). The outlet of the conveying device (13) is connected to the inlet of the high-temperature calcining device (14). The outlet of the high-temperature calcining device (14) is connected to the inlet of the cooling buffer device (15).

9. The high-purity lithium sulfide preparation system according to claim 8, characterized in that, The conveying device (13) is one of a shafted screw conveyor or a shaftless screw conveyor; the high-temperature calcining device (14) is one of a rotary kiln, a roller kiln, or an intermittent furnace; the cooling buffer device (15) is one of a metal silo with a cooling system or a non-metal silo with a cooling system, and the cooling system is one of oil cooling, water cooling, or air cooling.

10. The high-purity lithium sulfide preparation system according to claim 8, characterized in that, The cooling buffer device (15) is provided with a circulation channel (16) connected to the high-temperature calcination device (14). The cooling buffer device (15) is provided with a sampling port (17). When the material inspection result in the cooling buffer device (15) is qualified, it enters the next step of the dispersing unit; if the result is unqualified, it is transported to the buffer silo (12) through the circulation channel (16).

11. The high-purity lithium sulfide preparation system according to claim 8, characterized in that, The high-temperature calcination device (14) is equipped with either a bag filter or a metal membrane filter.

12. The high-purity lithium sulfide preparation system according to claim 8, characterized in that, The dispersing unit includes an output device (18) connected to the outlet of the cooling buffer device (15), the outlet of the output device (18) being connected to the inlet of the dispersing device (19), and the outlet of the dispersing device (19) being connected to the inlet of the material buffer silo (20).

13. The high-purity lithium sulfide preparation system according to claim 12, characterized in that, The output device (18) is one of a shafted screw conveyor, a shaftless screw conveyor, or a vibrating feeder; the dispersing device (19) is one of a mechanical crusher, a rod mill, or a vortex mill; and the material buffer silo (20) is one of a metal silo or a non-metal silo.

14. The high-purity lithium sulfide preparation system according to claim 12, characterized in that, The processing unit includes a demagnetizing device (21) connected to the outlet of the material buffer bin (20). The outlet of the demagnetizing device (21) is connected to the inlet of the buffer device (22), and the outlet of the buffer device (22) is connected to the packaging device (23).

15. The high-purity lithium sulfide preparation system according to claim 14, characterized in that, The demagnetizing device (21) is one of a rotary permanent magnet separator, a drawer-type permanent magnet separator, or an electromagnetic separator; the buffer device (22) is one of a metal silo or a non-metal silo; and the packaging device (23) is a packaging machine.

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