Characteristics of carbon nanotube ultrafine grinding and classification
ZHANG Ming-xing1,2, MA Xiao-hui1, FAN Qin-yu1
1. Key Laboratory for Treatment and Resource Utilization of Solid Waste of the Ministry of Education, School of Environment and Resource, Southwest University of Science and Technology, Mianyang 621010, China; 2. State Key Laboratory of New Technology for Float Glass, Bengbu 340300, China
Abstract: Carbon nanotubes powder is ultra-finely pulverized by mechanical mill and jet mill respectively to prepare ultrafine carbon nanotubes powder.Through adjusting the rotating speed of the classifier and the induced draft fan when the equipment runs, ultrafine carbon prepared under different operating parameters is controlled.The particle size, energy consumption, and morphological characteristics of the nanotubes are tested and analyzed.It is found that the particle size d50 of ultrafine carbon nanotubes powder is in the range of 10.127-2.540 μm when it is prepared at room temperature and the jet mill classifier rotates at a speed of 2 100-7 200 r·min-1.The d50 is in the range of 5.061-2.831 μm when the preparation temperature is at 200℃ and the rotating speed of jet mill classifier is between 4 800 r·min-1 and 6 000 r·min-1.The d50 is in the range of 4.892-11.443 μm when the air volume of mechanical mill is in the range of 339.757-688.903 m3·min-1.As the d50 of nanotube powder reaches 5 μm and 10 μm, the productivity of mechanical mill needs to be 1.6 times and 2.1 times respectively that of jet mill, while the energy consumption per ton of the jet mill is 3 times and 3.9 times respectively that of the mechanical mill.The particles of the carbon nanotube become smaller after mechanical milling and most of them have regular shapes.The particles of carbon nanotubes after jet milling have an obviously smaller size than that after mechanical milling, and most of them are in irregular shapes.By comparing particle size, energy consumption and morphological characteristics, a mechanical mill is suggested for crushing carbon nanotubes in industrial production.Through selecting appropriate operating parameters, mechanical mill can meet the requirement in particle size and achieve the purpose of energy saving.
张明星, 马小辉, 樊钦宇. 碳纳米管超细粉碎分级的特性研究[J]. 现代化工, 2022, 42(2): 236-240.
ZHANG Ming-xing, MA Xiao-hui, FAN Qin-yu. Characteristics of carbon nanotube ultrafine grinding and classification. Modern Chemical Industry, 2022, 42(2): 236-240.
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