气流粉碎干燥对碳纳米管水分含量的影响  

Effect of airflow crushing and drying on moisture content of carbon nanotubes

作　　者：颜翠平[1] 李杨 李世龙 严绍文 张明星[1] 李红 YAN Cuiping;LI Yang;LI Shilong;YAN Shaowen;ZHANG Mingxing;LI Hong(School of Environment and Resources,Key Laboratory of Solid Waste Treatment and Resource Recycle,Ministry of Education,Southwest University of Science and Technology,Mianyang 621000,China)

机构地区：[1]西南科技大学环境与资源学院,固体废物处理与资源化教育部重点实验室,四川绵阳621000

出　　处：《中国粉体技术》2024年第3期150-157,共8页China Powder Science and Technology

基　　金：国家自然科学基金项目,编号:52204286。

摘　　要：【目的】制备锂离子电池正极导电浆料中水分含量(质量分数,下同)极低(<10-3)的碳纳米管,研究对碳纳米管物料水分含量的影响因素。【方法】利用LNJ-12A型气流磨对碳纳米管湿物料进行超细粉碎干燥;通过改变气流磨的分级机转速、引风机转速、喷嘴喉部直径、粉碎腔体积,分析不同参数对碳纳米管物料水分含量的影响。【结果】在综合考虑能耗和实际工况下,当单因素变量为分级机转速4800 r/min、引风机转速2400 r/min、直喷嘴喉部直径4.5 mm、粉碎腔体积从1.14×10^(-2) m^(3)增加至23.56×10^(-2) m^(3)时,碳纳米管干燥后的水分含量分别为8.45×10^(-4)、6.68×10^(-4)、6.88×10^(-4)、5.89×10^(-4)。【结论】适当增大分级机转速,减小引风机转速,使用直径合适的直喷嘴,增大气流磨粉碎腔体积,对碳纳米管的水分干燥效果会产生有益影响,相同干燥次数下碳纳米管物料水分含量更低,且达到水分要求时的干燥次数更少。Objective In the production of lithium-ion batteries positive electrode conductive paste,it′s imperative to incorporate carbon nanotubes with extremely low moisture content(moisture content<103).Currently,the Chemical Vapor Deposition(CVD)method is widely employed in industry to prepare carbon nanotubes,which requires the use of a double cone rotary vacuum dryer.However,this process has disadvantages such as a low filling rate and high energy consumption.This study proposes the use of jet mill in the moisture drying process of carbon nanotubes and analyzes the influence of various process parameters on moisture content.It aims to provide insights into the industrial-scale moisture drying of carbon nanotubes.Methods In this study,the LNJ-12A jet mill was utilized to ultrafine crush and dry wet carbon nanotubes materials.A series of single-factor experiments were conducted to investigate the effects of various parameters,including the speed of the classifier,the speed of the induced draft fan,the diameter of the nozzle throat,and the volume of the grinding chamber on the water content of carbon nanotubes.Finally,the optimal parameter combination for moisture drying of carbon nanotubes was obtained.Results and Discussion Increasing the speed of the classifier enhanced the drying effect of carbon nanotube moisture.As the classifier speed increased,the coarse particles experienced heightened forces from the blades,resulting in increased centrifugal force that propelled them outwards from the classification wheel.Subsequently,these particles descended into the crushing area for further refinement and drying.Moreover,an elevated classifier speed amplified the blowing effect of the classifier blades,extending the residence time of carbon nanotube materials within the crushing chamber.However,excessive classifier speed could also lead to increased energy consumption,therefore a reasonable increase in speed was required.It was observed that reducing the speed of the induced draft fan enhanced the drying effect of carbon

关 键 词：碳纳米管 超细粉碎 气流粉碎 

分 类 号：TQ127.11[化学工程—无机化工] TB383.1[一般工业技术—材料科学与工程] TB44