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, solution 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 but poor crystallization and broad particle size distribution by carbonation with high production cost from the sintering process. And aluminum 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.
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