KR-102961487-B1 - Powder material drying system with improved bag filter removal efficiency and method for drying powder material using the same

Abstract

The present invention relates to a powder material drying system with improved bag filter dust removal efficiency and a method for drying powder materials using the same. More specifically, the invention comprises: a reactor body providing a space for drying powder particles; an impeller for flowing powder particles during drying; a heating unit for controlling the temperature inside the reactor; a driving unit provided on the upper part of the reactor body for driving the impeller; a bag filter unit for filtering and separating powder particles and moisture; an air pulsing line for spraying pulsing air onto the upper part of the bag filter provided on the bag filter unit; and a drying device including a compressor for compressing air to high pressure; a receiver tank for storing compressed air, stabilizing pressure, and discharging condensate; an aftercooler for cooling the compressed air to condense and discharge moisture in the air; an air dryer for further removing moisture in the air; an adsorption drying tower for removing remaining trace amounts of moisture; a carbon dioxide removal tower for removing carbon dioxide from the moisture-removed air to produce ultra-high purity air; and ultra-high purity air at the internal temperature of the bag filter unit and The present invention relates to a powder material drying system comprising an air compression system including a heating receiver tank that heats to the same or similar temperature and stabilizes pressure while storing heated ultra-high purity air, and a method for drying a powder material using the same. The present invention can be applied to the drying process of various industrial powder materials, such as metals, inorganic compounds, lithium compounds, rare earth elements, and ceramic powders.

Inventors

• 장순민
• 이상호
• 황재영
• 유도영
• 심재용
• 김백겸

Assignees

• 주식회사 미라클솔루션

Dates

Publication Date

20260507

Application Date

20251203

Claims (7)

1. In a powder material drying system comprising a drying device and an air compression system for drying powder particles, The above drying device comprises a reactor body providing a space for drying powder particles, an impeller for flowing powder particles during drying, a heating unit for controlling the temperature inside the reactor body, a driving unit provided on the upper part of the reactor body for driving the impeller, a bag filter unit provided on the upper part of the reactor body for filtering and separating powder particles and moisture, an air pulsing line for spraying pulsing air onto the upper part of the bag filter provided on the bag filter unit, and a discharge unit for discharging dried powder particles. The above air compression system comprises a compressor for compressing air to high pressure, a receiver tank for storing compressed air, stabilizing pressure, and discharging condensate, an aftercooler for cooling the compressed air to condense and discharge moisture in the air, an air dryer for further removing moisture in the air, an adsorption drying tower for removing remaining trace amounts of moisture, a carbon dioxide removal tower for removing carbon dioxide from the moisture-removed air to produce ultra-high purity air, and a heating receiver tank for heating the ultra-high purity air to the same temperature as the internal temperature of the bag filter section, and stabilizing pressure while storing the heated ultra-high purity air. A powder material drying system characterized by further including an opening/closing gate that opens and closes the space between the reactor body and the bag filter section.
2. A powder material drying system according to claim 1, wherein the adsorption drying tower comprises first and second adsorption drying towers, and the carbon dioxide removal tower comprises first and second carbon dioxide removal towers.
3. A powder material drying system according to claim 1, characterized in that the bag filter section is composed of two parts.
4. delete
5. In a powder material drying system comprising a drying device and an air compression system for drying powder particles, The above drying device comprises a reactor body providing a space for drying powder particles, an impeller for flowing powder particles during drying, a heating unit for controlling the temperature inside the reactor body, a driving unit provided on the upper part of the reactor body for driving the impeller, a bag filter unit provided on the upper part of the reactor body for filtering and separating powder particles and moisture, an air pulsing line for spraying pulsing air onto the upper part of the bag filter provided on the bag filter unit, and a discharge unit for discharging dried powder particles. The above air compression system comprises a compressor for compressing air to high pressure, a receiver tank for storing compressed air, stabilizing pressure, and discharging condensate, an aftercooler for cooling the compressed air to condense and discharge moisture in the air, an air dryer for further removing moisture in the air, an adsorption drying tower for removing remaining trace amounts of moisture, a carbon dioxide removal tower for removing carbon dioxide from the moisture-removed air to produce ultra-high purity air, and a heating receiver tank for heating the ultra-high purity air to the same temperature as the internal temperature of the bag filter section, and stabilizing pressure while storing the heated ultra-high purity air. The above bag filter section further includes a vibrating plate having an opening into which a bag filter is fitted, and a fixed plate having an opening corresponding to the opening of the vibrating plate and through which the bag filter is disposed. The above fixed plate is fixedly mounted to the main body of the bag filter unit to separate the upper and lower spaces of the main body of the bag filter unit, and A powder material drying system characterized by having an ultrasonic vibrator in contact with the above-mentioned vibration plate.
6. A method for drying a powder material using a powder material drying system according to any one of claims 1, 2, 3, and 5
7. A method for drying a powder material using a powder material drying system according to claim 1, wherein the opening and closing gate is in a closed state while the powder material is introduced into the drying device, and A method for drying powder material using a powder material drying system characterized in that the opening and closing gate is in an open state during the drying process after the powder material is introduced.

Description

Powder material drying system with improved bag filter removal efficiency and method for drying powder material using the same The present invention relates to a powder material drying system with improved bag filter dust-cleaning efficiency and a method for drying powder materials using the same. More specifically, the invention relates to a powder material drying system with improved bag filter dust-cleaning efficiency that addresses the clogging of the filter caused by fine particles aggregating in the bag filter during the powder material drying process, and a method for drying powder materials using the same. The present invention can be applied to the drying process of various industrial powder materials, such as metals, inorganic compounds, lithium compounds, rare earth elements, and ceramic powders. Recently, NdFeB (neodymium-iron-boron)-based rare earth magnets are widely used in electric vehicle drive motors to achieve high output and miniaturization. During the manufacturing process of these rare earth magnets, rare earth alloy powder is wet-ground, resulting in a slurry-like powder. The alloy powder in slurry form is then processed into a dry powder by removing moisture and solvents using a spray dryer or a vacuum dryer. Meanwhile, lithium-ion secondary batteries are widely used in various fields such as electric vehicles, ESS, and portable electronic devices based on their high energy density and safety, and the performance of secondary batteries is significantly affected by the type and purity of the lithium raw material used in the cathode material. Lithium hydroxide is suitable for the synthesis of high-nickel cathode materials (NCM, NCA) and is widely used in the manufacture of high-energy-density batteries for electric vehicles; it is classified into lithium hydroxide monohydrate (LiOH·H₂O) and anhydrous lithium hydroxide (LiOH) depending on its moisture content. Lithium hydroxide monohydrate is manufactured through conversion reactions between lithium carbonate and calcium hydroxide, NaOH reactions based on brine raw materials, and leaching and neutralization processes based on spodumene ore, and contains approximately 43% moisture in the form of crystal water. To manufacture high-energy-density cathode materials, anhydrous lithium hydroxide obtained by removing crystal water is required, and for this purpose, a heating and drying process in a vacuum or inert atmosphere is essential. However, during the drying process, not only is there a problem where lithium hydroxide reacts with moisture and carbon dioxide in the air to re-convert into monohydrate or lithium carbonate, but there is also a frequent problem of the bag filter becoming clogged due to moisture condensation during the fine particle collection process inside the dryer. Since high-purity and high-performance materials are required for electric vehicle battery materials such as lithium hydroxide and permanent magnet materials such as rare earth powders, thorough moisture management and powder particle size control are necessary. Furthermore, suppressing condensation caused by changes in high and low temperatures, preventing filter clogging, and ensuring stable drying performance are critical process elements. However, in the case of conventional drying devices, condensation occurs due to the temperature difference between the air injected during air pulsing for bag filter dust removal and the inside of the dryer, causing fine particles to aggregate and adhere to the filter surface, thereby degrading the bag filter filtration performance. Consequently, problems such as increased drying time, uneven product quality, and frequent bag filter replacement occur. Therefore, there is a need to develop a powder material drying system and drying method capable of resolving issues such as bag filter clogging, condensate formation, and fine powder aggregation occurring in various powder-based high-performance material manufacturing processes, including the lithium hydroxide anhydride anhydration process and the rare earth magnet manufacturing process, while also improving drying and reaction efficiency. FIG. 1 shows a drying device in a powder material drying system with improved filter dust removal efficiency according to the present invention. FIG. 2 shows an air compression system in a powder material drying system with improved filter dust removal efficiency according to the present invention. FIG. 3 shows a bag filter section in a powder material drying system with improved filter dust removal efficiency according to the present invention. FIG. 4 shows the combined structure of the vibrating plate and the fixed plate of the bag filter section in the powder material drying system with improved filter dust removal efficiency according to the present invention. FIG. 5 shows the upper part of a vibrating plate in a powder material drying system with improved filter dust removal efficiency according to the present invention. The embodiment