白炭黑制备过程中粒度分布变化及其分形特征  

Change of Particle Size Distribution and Fractal Characteristics during the Preparation of Silica Particles

作　　者：郭雨[1,2] 陈君华[1] 石国亮[3] 丁志杰[1] 程年寿[1] 郭腾[1] 徐卫兵[2] 

机构地区：[1]安徽科技学院化学与材料工程学院,蚌埠233100 [2]合肥工业大学,合肥230009 [3]太原科技大学,太原030021

出　　处：《硅酸盐通报》2015年第6期1536-1542,共7页Bulletin of the Chinese Ceramic Society

基　　金：安徽省教育厅自然科学基金项目(KJ2013085);安徽省高校省级自然科学研究重点项目(KJ2012A069);蚌埠市(2011)年度科技计划项目(BK201136)

摘　　要：采用激光粒度仪测定了白炭黑制备过程中沉淀初期、反应末期、陈化末期和干燥阶段的粒度分布曲线,研究了硅源种类、酸种类、乙醇和超声波对不同制备阶段白炭黑粒子粒度分布和中值粒径D50的影响,并对不同制备阶段的分形维数进行了数值模拟。研究结果表明,选择反应物、加入乙醇以及施加超声波均可以减小干燥白炭黑粉末的分形维数D和中值粒径D50,其中超声波对白炭黑产品的粒度分布有明显窄化作用。不同实验条件下,四个阶段的分形维数D具有良好的线性关系,线性相关程度R高于0.966,表明制备过程中不同阶段的分形维数符合分形分布规律,能够很好地对高品质白炭黑反应过程进行预测。The particle distribution of silica was measured by laser particle size analyzer during different stages including the initial precipitation, the acid-adjusting end, the aging end and the drying end. The influences of the experimental conditions, such as types of the siliceous sources and acids, ethanol and ultrasonic on fractals dimension D and the medium diameter Ds0 as evaluation indicator were discussed and analyzed numerically. The results indicated that type of the siliceous sources, type of acids, ethanol and ultrasound had important effects on fractals dimension D and the medium diameter Ds0 of the products. Especially, the ultrasonic treatment could make the grain size of the resulting silica particles narrower. Particle size distributions of four stages possessed good fractals behavior, and the fractals dimension D increased linearly with the grain size increasing with a correlation coefficient up to 0. 966. It was concluded that the magnitude of fractals could be utilized to predict silica preparation.

关 键 词：白炭黑 粒度分布 分形 制备 

分 类 号：TQ127[化学工程—无机化工]