铝酸钠溶液中超细氢氧化铝制备的研究进展  

Research Progress on Preparation of Superfine Aluminum Hydroxide in Sodium Aluminate Solution

作　　者：孔莲莲[1] 刘桂华[1] 田侣[1] 

机构地区：[1]中南大学冶金科学与工程学院,难冶有色金属资源高效利用国家工程实验室,长沙410083

出　　处：《材料导报》2012年第21期47-51,共5页Materials Reports

基　　金：湖南省科技重大专项(2009FJ1009)

摘　　要：简要介绍了各种以铝盐为原料制备超细氢氧化铝粉方法的优缺点。以铝酸钠溶液为原料,结合拜耳法和烧结法生产氧化铝的工艺,阐述了碳分法、种分法制备氢氧化铝的机理以及晶种制备方法、溶液制备方法、溶液组成和分解制度等对超细氢氧化铝纯度、白度和粒度分布等的影响规律。烧结法溶液产品白度高,但碳分产品结晶差、粒度分布宽,生产成本高,而以拜耳法溶液为原料种分的氢氧化铝结晶好、粒度分布易控制,但产品白度低。国外拜耳法溶液浓度较低,相比之下我国高浓度溶液仍需在溶液净化、种分机理等方面进行深入研究,以提高产品质量,开发更多产品。The advantages and limitations of preparing superfine aluminum hydroxide based on aluminum salt as raw material are reviewed. The mechanism of seeded precipitation or carbonation from aluminate solution is discussed on the basis of alumina production by Bayer process or sintering process, and the influences of seed preparation, solu- tion preparation, solution composition and preparation operation on purity, whiteness and particle size distribution of superfine aluminum hydroxide are also reviewed. Aluminum hydroxide appears in high whiteness hut poor crystalliza- tion and broad particle size distribution by carbonation with high production cost from the sintering process. And alu- minum hydroxide crystallizes well and distributes narrowly in particle size by seeded precipitation from Bayer process but appears in low whiteness. Compared with low concentration solution in foreign alumina refineries, it will take further work to study solution purification and seeded precipitation mechanism in high concentration solution by the Bayer process in China, in order to improve the quality and develop more products.

关 键 词：铝酸钠溶液 氢氧化铝 种分 碳分 超细 

分 类 号：TQ133.1[化学工程—无机化工]