[Al species distribution of organic silicate aluminum hybrid flocculants by Al-ferron complexation timed spectrophotometric method].

New types of organic silicate aluminum hybrid flocculants were prepared by employing Tetraethylorthosilicat (TEOS), Diethoxydimethylsilane (DEDMS), gamma-Aminopropylmethyldiethoxysilane (APDES) as silicon source. The Al species distribution in these new products was investigated by Al-Ferron complexation timed spectrophotometric method. The results show that silicon source, basicity (B) and Si/Al molar ratio have effect on the Al species distribution. Among them, basicity has greater effect, three sets of products have similar characteristics. The content of Al(a) declines with the rise of B value, while the contents of Al(b) and Al(c) increase. Al(c) is the dominant Al species in the products with TEOS as silicon source. DEDMS has little contribution to the distribution of Al species. In the products with APDES as silicon source, Al(c) is the dominant Al species while the content increases with the rise of Si/Al molar ratio.