PACS的结构特征及絮凝性能研究

STUDY ON THE CHARACTERISTICS OF STRUCTURE AND FLOCCULATION PROPERTIES OF PACS

制备了碱化度及Al^(3+)/SO_4^(2-)摩尔比不同的系列PACS,分别进行常压(干燥温度105℃)及真空干燥(真空度为—0.098MPa、干燥温度65℃)制备固体产品.用红外光谱及X-射线衍射谱研究了碱化度、Al^(3+)/SO_4^(2-)摩尔比、干燥温度对PACS的结构影响,比较了干燥温度不同对PACS固体样品的溶解度及絮凝效果的影响,借助于显微电泳测定技术研究了不同碱化度及不同Al^(3+)/SO_4^(2-)摩尔比的PACS水解产物对高岭土微粒表面电性的中和情况.由实验结果可推断,PACS聚合形态取决于碱化度及Al^(3+)/SO_4^(2-)摩尔比,干燥温度影响PACS的结构形态和水溶性,因而也影响PACS絮凝效果.碱化度及Al^(3+)/SO_4^(2-)摩尔比对PACS水解产物的电中和能力影响不大.

A series of polyaluminium chloride with sulfate ion(PACS), which have different basicities and A13+/SO42- molar ratio, have been prepared and dried at 105℃ and 65℃ respectively. The effect of basicity, molar ratio of A13+/SO42- and drying temperature on the structure of PACS were studied by IK spectroscopy and X-ray diffraction. The effect of drying method on the solubility and coagulation function of the solid PACS samples were also discussed. The ability of PACS with different basicities and A13+/SO42- molar ratio neutralizing the charges on kaolin were investigated by determing the variation of Zeta petential of kaolin. The experimental results showed that the polymeric degree of PACS was related to basicity and A13+/SO42- molar ratio. Drying temperature has an influence on the structure and the solubility of PACS. The ability of PACS neutralizing the charges on kaolin was affected by the basicity and Al3+/SO42- molar ratio of PACS.