陶瓷微滤膜洗涤碱法制备Al(OH)_3中杂质Na^+的研究  

Study on ceramic membrane washing process of the Na + in Al(OH) 3 powders by alkaline method

作　　者：董强[1] 廖翔 季兆全 彭定坤[1] 孟广耀[1] 

机构地区：[1]中国科学技术大学材料科学与工程系,合肥230026 [2]长城新元膜科技有限公司,合肥230601

出　　处：《膜科学与技术》2004年第5期29-32,共4页Membrane Science and Technology

基　　金："863"项目(2001AA323090);"面向21世纪教育振兴行动计划"资助项目

摘　　要：采用无机陶瓷微滤膜,以错流过滤方式对工业上碱法生产的Al(OH)3粉体浆料进行Na+离子的清洗过滤研究.实验考察了操作压力、错流速率、浆料浓度等工艺参数的影响,确立了适合于超细粉体膜清洗过滤的工艺条件.经过陶瓷膜洗涤过滤过程,Al(OH)3粉体粒子仍保持其原始形貌,但粉体的分散性和纯度获得大幅度提高,膜清洗后的Al(OH)3粉体中Na2O含量降为57mg/kg;粒径尺寸约为50nm.研究结果表明,膜清洗过滤效率、操作方式以及产品质量等方面均明显优于目前工业生产上普遍应用的板框压滤机,为无机陶瓷微滤膜技术应用于碱法制备Al(OH)3工艺中的洗涤过滤提供了科学与工程化依据.The washing process by using ceramic micro-filtration membranes for Na + in Al(OH) 3 powders was studied.The parameters identifying the washing conditions,such as the operation pressure,the cross flow veˉlocity,the slurry concentration,were examined and optimized.The shape of Al(OH) 3 particles did not change and the scale of these particles was about50nm after the washing by using ceramic micro-filtration memˉbranes.The concentration of remains ions Na + was57mg/kg.The results demonstrate that the washing proˉcess by using ceramic membrane separation is superior to the traditional plate-and frame filter press and would be the advanced technique for ultra-fine powders preparation by wet-chemical method.

关 键 词：陶瓷微滤膜 洗涤碱法 制备 AL(OH)3 杂质 氧化铝陶瓷 超细粉体 膜清洗 

分 类 号：TQ174[化学工程—陶瓷工业]