文档介绍：第 41 卷第 5 期
2010 年 10 月
中南大学学报(自然科学版)
Journal of Central South University (Science and Technology)
结晶助剂在铝酸钠溶液种分过程中的作用机理
刘战伟 1, 2,陈文汨 1,李旺兴 1, 2
(,湖南长沙,410083;
,河南郑州,450041)
Oct. 2010
摘
要:为了了解结晶助剂(CGM)在铝酸钠溶液种分过程中的作用机理,研究 CGM 对二次成核和附聚过程的影
响。通过对粒度分布及扫描电镜(SEM)照片的对比,探讨 CGM 对分解过程的影响。研究结果表明:在二次成核
过程中,添加微量 CGM 的溶液中一开始会形成大量的二次成核,但是,这些二次成核细粒子会被立即吸附到晶
种表面或者快速附聚而形成大孔隙的聚合体,从而使得二次成核的细粒子数量减少;在附聚过程中,添加微量
CGM 有助于提高附聚阶段的黏结过程,形成结实的块状六角几何形状的附聚体;添加 CGM 可以有效地减少磨损
时颗粒的破裂,从而形成完全黏结的附聚物。
关键词:结晶助剂;铝酸钠溶液;种分;二次成核;附聚
中图分类号:TF111
文献标志码:A
文章编号:1672−7207(2010)05−1709−05
Mechanism of crystal growth modifier in bayer seeded precipitation
process of sodium aluminate solution
LIU Zhan-wei1, 2, CHEN Wen-mi1, LI Wang-xing1, 2
(1. School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China;
2. Zhengzhou Research Institute of Aluminum Corporation of China Limited, Zhengzhou 450041, China)
Abstract: In order to understand the mechanism of crystal growth modifier (CGM) in Bayer seeded precipitation process
of sodium aluminate solution better, the effects of CGM on the secondary nucleation and agglomeration process were
studied. The effects of CGM on seeded precipitation process were researched by the analysis of particle size distribution
and scanning electron microscope (SEM). The results show that