-
E-mail
Maxzhang1130@outlook.com
-
Phone
18601373008
-
Address
No. 12 Jinxing Road, Daxing Industrial Zone, Beijing
Beijing Tianli Hengcheng Technology Co., Ltd
Frontier breakthroughs and industrial applications of low-temperature ultrafine grinding processing technology
Date: 2025-06-11Read: 0
1、 Technical principles and core advantages
Low temperature ultrafine grinding technology uses refrigerants such as liquid nitrogen (-196 ℃) or dry ice to cool the material below the brittleness point, and combines mechanical impact and shear force to achieve micron level grinding. Its core lies in:
Low temperature embrittlement effect: It transforms the molecular structure of the material from ductile to brittle state, reducing crushing energy consumption by more than 40%.
Thermal protection mechanism: The entire temperature is controlled between -50 ℃ and 20 ℃ to avoid protein denaturation or loss of volatile components.
Particle size control technology: equipped with grading wheel rotors and airflow screening systems, it can achieve precise particle size distribution of 0.1-25 μ m.
Typical equipment such as low-temperature impact mills achieves cell level crushing with a wall breaking rate of over 99% through the impact shearing of high-speed rotors (line speed of 100m/s) and lining teeth, combined with -20 ℃ cold air circulation.
2、 Progress in Key Technical Equipment
1. Cold source closed-loop circulation system
The new generation of equipment adopts liquid nitrogen vaporization recovery technology, which increases the utilization rate of cold energy to 85% and saves 30% energy compared to traditional modes. A certain model of traditional Chinese medicine crusher achieves continuous processing of material pre cooling, deep cooling, and crushing through a screw conveyor.
2. Intelligent parameter regulation
By adjusting the classifier frequency (0-100Hz) and induced draft fan airflow (5-20m ³/min) in real-time, different material characteristics can be dynamically adapted. The low-temperature impact mill developed by Nanchang University realizes that the CV value of brown rice powder particle size is less than 5% through three frequency joint control.
3. Composite crushing mode
Combining the advantages of airflow collision and mechanical grinding, fluidized bed collision equipment can process materials with Mohs hardness level 9 and D50 particle size below 5 μ m. In the processing of positive electrode materials for lithium batteries, this technology increases the specific capacity of NCM ternary materials by 15%.
3、 Typical cases of industry application
In the field of traditional Chinese medicine, the full wall breaking technology increases the release rate of effective ingredients in Ganoderma spore powder by 14-40 times, and stabilizes the particle size at 2.5-5 μ m.
Functional food: After treatment, the conversion rate of soluble dietary fiber in bamboo shoots is increased by 60%, and their water holding capacity is enhanced by 300%.
New material preparation: Used for carbon fiber recycling and processing, it can achieve micronization with fiber length retention rate>90%.
