新型混凝剂聚合氯化铝钙表征

Characterization of New Coagulant-Polymeric Aluminum-Calcium Chloride

目的研究聚合氯化铝钙中铝形态、钙含量与反应条件的关系,并确定聚合氯化铝钙的分子通式.方法采用Al-Ferron逐时络和比色法分析产品中的铝的形态;络合滴定法测定产品中钙的含量;并根据X-射线衍射图谱解析和相关元素含量的测定推测出聚合氯化铝钙的分子结构.结果焙烧对产品中钙质量的影响较大,酸溶工艺对钙含量的影响较小.随酸溶时间的延长,产品中铝的含量减少,而钙的含量基本保持不变.适当增加酸的用量对提高产品中铝的含量有所增加.结论聚合氯化铝钙分子通式为Ca8Al11(OH)nCl49-n.yH2O,1≤n≤48,y≤5.提高反应物配比中氧化铝的比例,产物中Alb的含量增大.适当提高焙烧温度Alb含量增大,Ala和Alc含量减小.延长酸溶反应时间Alb含量减少.

Aluminum species of polymeric aluminum - calcium chloride（PACC） were studied by Al - Ferron timed complex colorimetric method, and the calcium content was determined by titration. The molecular structure of PACC was speculated by X - ray and mass content of relative elements. The results show that baking temperature has great effect on mass content of calcium while acid dissolving process has little impact on it. Mass content of aluminum decreases with prolonged acid dissolving time and that of calcium keeps 10 % around. The suitable increase of acid quantity is available to enhance mass content of aluminum in the product.The content of Alb in the product decreases with prolonged acid dissolution time. The general molecular structure of PACC is Ca8Al11（OH）nCl49-n.yH2O,1≤n≤48,y≤5. The content of Alb in the product increases with the aluminum oxide proportion and the suitably enhanced temperature.