振动混料搅拌介质对微粉混合均匀度的影响
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摘要
为提高多组分微粉混合均匀度,提出一种在混料容腔中加入固体介质的振动搅拌混合方法;建立以玛瑙球为搅拌介质的混料振动仿真模型,采用EDEM对粒径为50～150μm的矿料及粉状催化剂混合进行模拟,分析搅拌介质的数量和混料面的倾斜角度对混合均匀度的影响规律;采用自制的实验台进行振动混料实验。结果表明:在振动混料条件下,加入搅拌介质和合适物料翻面倾角可显著提高微粉混料的均匀度和混合效率;当坩埚中加入1个玛瑙球、混料盘翻面倾角为20～30°、混料时间约为2. 5 min时,混合均匀度可满足实验需要,混料效果好、效率高;仿真模型是准确性的,可为大批量混料生产作业提供借鉴和参考。
A mixed stirring method with solid medium in a sealed chamber was proposed to improve the mixing uniformity of multi-component micropowder. The vibration mixing method was adopted with agate ballas the mixing medium. EDEM was used to simulate the mixing uniformity of the mineral and powdered catalyst with particle size of 50 μm to 150μm. The influence of the number of stirring medium and the inclination angle of mixing tray on the mixing uniformity was analyzed.A vibration test bench was developed and the vibration mixing test was carried out. The results show that proper vibration stirring and proper vibration inclination angle can significantly improve the uniformity and efficiency of micro-powder mixing. When an agate ball is added into the crucible,the turning angle of the mixing tray is 20 ～ 30 degrees,and the mixing time is about 2. 5 minutes. The mixing uniformity can meet the test requirements,the mixing effect is good,and the mixing efficiency is high. The experiment verifies the correctness of the simulation model,and provided theoretical support for mass mixing production operation.
A mixed stirring method with solid medium in a sealed chamber was proposed to improve the mixing uniformity of multi-component micropowder. The vibration mixing method was adopted with agate ballas the mixing medium. EDEM was used to simulate the mixing uniformity of the mineral and powdered catalyst with particle size of 50 μm to 150μm. The influence of the number of stirring medium and the inclination angle of mixing tray on the mixing uniformity was analyzed.A vibration test bench was developed and the vibration mixing test was carried out. The results show that proper vibration stirring and proper vibration inclination angle can significantly improve the uniformity and efficiency of micro-powder mixing. When an agate ball is added into the crucible,the turning angle of the mixing tray is 20 ～ 30 degrees,and the mixing time is about 2. 5 minutes. The mixing uniformity can meet the test requirements,the mixing effect is good,and the mixing efficiency is high. The experiment verifies the correctness of the simulation model,and provided theoretical support for mass mixing production operation.
引文
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[2]李少华,朱明亮,张立栋,等.回转装置内三组元颗粒径向混合评价方法分析[J].化工进展,2013,32(6):1224-1229.
[3]马宁,李萌,陈松,等.垂直振动激励下不同状态物料的宏观混合效果[J].科学技术与工程,2016,16(5):207-211.
[4]戚华彪,周光正,于福海,等.颗粒物质混合行为的离散单元法研究[J].化学进展,2015,27(1):113-124.
[5]范尚武,徐永东,张立同,等.振动频率和振动时间对粉料填充密度的影响[J].耐火材料,2005(2):123-125,129.
[6]梁增华,刘邱祖,马麟,等.基于EDEM的钛粉在振动成形中的填充密度模拟研究[J].粉末冶金工业,2017,27(4):31-34.
[7]任继良,李志鹏,周忠勇,等.烟花火药成分的混合均匀性[J].中国粉体技术,2014,20(3):25-29.
[8]张紫薇,葛良,桂南,等.转速对三维滚筒内颗粒混合特性的影响[J].中国科学院大学学报,2017,34(2):218-225.
[9]JIANG Z H,LU K Q,HOU M Y,et al.Sandwich-like segregation in vertically vibrated binary granular mixtures[J].Acta Physica Sinica,2003,52(9):2244-2248.
[10]GUI N,FAN J R,CEN K F.A macroscopic and microscopic study of particle mixing in a rotating tumbler[J].Chemical Engineering Science,2010,65(10):3034-3041.
[11]张立栋,刘朝青,于丁一,等.低转速回转滚筒内三组元颗粒混合机理[J].粉末冶金材料科学与工程,2014,19(6):867-873.
[12]余学闯,谌炎辉,谢国进.基于EDEM的不同颗粒粒径对物料安息角的影响研究[J].机械研究与应用,2017,30(6):7-11.
[13]陶明,徐海军.玛瑙的结构、水含量和成因机制[J].岩石矿物学杂志,2016,35(2):333-343.
[14]陶珍东,郑少华.粉体工程与设备[M].3版.北京:化学工业出版社,2015.
[15]王振宇,周伟,杨利福,等.水平振动情况下颗粒系统振动分离机理的离散元数值研究[J].振动与冲击,2016,35(16):24-29.
[16]赵啦啦,刘初升,闫俊霞,等.不同振动模式下颗粒分离行为的数值模拟[J].物理学报,2010,59(4):2582-2588.
[17]刘永桥,管声启,柴彩彩.基于EDEM的固体粉末物料振动下料过程分析[J].西安工程大学学报,2017,31(2):278-282,288.