铝酸钠溶液碳化制备活化氧化铝

PREPARATION OF ACTIVE ALUMINA BY CARBONATION OF SODIUM ALUMINATE SOLUTION

考察了铝酸钠溶液碳化法制备活性氧化铝的实验条件。结果表明不同的加料方式、沉淀时ｐＨ值和温度均对产物的物性结构有极大的影响。合适实验条件下，等ｐＨ值加料、变ｐＨ值加料和交替变ｐＨ值加料三种方式都可获得拟薄水铝石沉淀，在一定范围内可通过调节操作参数来控制拟薄水铝石的其它物化性质，如比表面、堆积密度等。拟薄水铝石再经高温加热脱水后生成所需的活性氧化铝。与通常采用工业氢氧化铝酸溶后用碱再沉淀的制备路线相比，本方法制备工艺简单且成本低。

The nature of carbonation of sodium aluminate solution was investigated It has shown that the feeding method, pH, precipitation temperatures have great influences on product properties Pure pseudoehmite could be obtained by the pHstat, pHchanging and pHswing feeding methods at due experimental conditions A variety of pseudoboehmites with different properties such as specific area and bulk density may be prepared through adjusting preparation parameters Active γAl 2O 3 products were obtained by calcinating pseudoboehmites at elevated temperatures Compared with conventional method, carbonation method is simple and economical