研究了铝矾土料浆的离心喷雾造粒过程,考察了料浆固含量、粘度、喷雾头的旋转速度对粉体干燥的影响.从颗粒内部水分迁移的距离、空气进出口温度两方面,分析了蘑菇头颗粒、变形颗粒、球形颗粒和破裂颗粒等颗粒形貌的形成原因,并优化了一组工艺参数:喷雾头转速为12000r/min,料浆固含量为50%,热风入口温度为300℃,废气出口温度为115℃,塔内负压为-350Pa,料浆流速为4L/h,料浆的粘度为14s,在此条件下能制备出球形度高、颗粒粒径集中分布在55μm左右的粉体.
The centrifugal spray drying process of bauxite slurry is studied,the influence of slurry solids content,viscosity and rotation rate is investigetaed. The formation causes about the mushroom head-liked particles,anamorphic particles,spheric particles, cracked particles etc. are analyzed from two sides, which are the transfer distance of moisture in the particles and in/out air temperature. The optimal operation parameters are obtained to prepare high spheric particles with the diameter distribution of 55μm: rotation frequency of spray head is 12000r/min,solids content of slurry is 50%,inlet temperature of hot air is 300℃ ,outlet temperature of exhaust gas is 115℃, press of tower is -350Pa, flow speed of slurry is 4L/h and viscosity is 14s.
参考文献
| [1] | Morteza Eslamian;Nasser Ashgriz .Effect of precursor,ambient pressure,and temperature on the morphology,crystallinity,and decomposition of powders prepared by spray pyrolysis and drying[J].Powder Techn,2006,167:149. |
| [2] | Li Xin Huang;Arun S. Mujumdar .The Effect of Rotary Disk Atomizer RPM on Particle Size Distribution in a Semi-Industrial Spray Dryer[J].Drying technology: An International Journal,2008(10/12):1319-1325. |
| [3] | Gong Zhiqing et al.Spray drying and agglomeration of instant bayberry powder[J].Drying Techn,2008,26:116. |
| [4] | Renata V. Tonon;Catherine Brabet;Miriam D. Hubinger .Influence of process conditions on the physicochemical properties of acai (Euterpe oleraceae Mart.) powder produced by spray drying[J].Journal of food engineering,2008(3):411-418. |
| [5] | 王忠喜;于才渊;周才君.喷雾干燥[M].北京:化学工业出版社,2003:109. |
| [6] | Vehring R .Pharmaceutical particle engineering via spray drying.[J].Pharmaceutical research,2008(5):999-1022. |
| [7] | 章登宏,龚树萍,周东祥,姜胜林,汪小红,谭险峰,奚玉敏.喷雾造粒因素对粉体颗粒形成的影响[J].中国陶瓷,2000(06):7-9,19. |
| [8] | 马运柱,黄伯云,范景莲,熊翔,汪登龙.离心式喷雾干燥制备纳米晶粉末的工艺原理及其影响因素[J].硬质合金,2002(03):173-176. |
| [9] | 程小苏,方海鑫,刘泽昊,张迎元,王岳,王永朝,梁志先,曾令可.喷雾干燥制备陶瓷微球过程的数值模拟[J].华南理工大学学报（自然科学版）,2007(02):107-111. |
| [10] | Walton D E .The morphology of spray-dried particles a qualitative view[J].Drying Techn,2000,18(09):1943. |
| [11] | Chan L W et al.Process analytical technology:Application to particle sizing in spray drying[J].Process Anal Techn,2008,9(01):259. |
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