超重力法碳分制备纳米三水合氧化铝的研究

一种超薄六角片状的纳米三水氧化铝（三水铝石）通过超重力碳分的方法被成功制备。文中叙述了实验过程，并讨论了超重力碳分过程中各主要操作参数对产品粒度、形貌和产率等方面的影响，以及水热老化、超重力水洗及干燥过程对产品的影响。采用TEM、XRD、BET和连续等离子光谱分析仪（SPS）对产品的形貌、粒度、晶型、比表面积、钠离子含量进行了分析表征。结果表明其颗粒形貌为超薄六角片状，晶型为Gibbsite类型的三水铝石，根据其比表面积为26.2m²/g，测算其当量粒度为94.24nm，三水铝石中氧化钠质量分数为0.279%。

Preparation of nano aluminium trihydroxide by high gravity carbonation

A kind of ultra thin hexagonal nano alumina trihydroxide (ATH) has been synthesized by high gravity reactive precipitation and using CO₂ as acidifier. This paper describes the experimental procedures in detail, discusses the effects of various parameters on carbonation process, as well as the effects of thermal hydrolysis, high gravity washing and dryness on the products. The typical nano ATH product was characterized by XRD, TEM, BET and SPS for its crystal phase, particle morphology, surface area and the content of sodium oxide. The results indicate that the product has ultra thin hexagonal morphology, and attributes gibbsitic type of aluminum hydroxide. Corresponding to its specific surface area of 26.2 m²/g, the particle size of ATH is calculated to be 94.24 nm. The content of sodium oxide is 0.279%.