聚合氯化铝的制备与分析研究

Study on preparation and analysis of polyaluminum chloride

通过结晶氯化铝水解、逐滴加碱和氢氧化铝法3种方法制备聚合氯化铝（PAC），采用Al-Ferron逐时络合比色法和红外光谱分别进行分析和对比分析。结果表明：水解法所得PAC盐基度（B）低（B=4％－8％），优点是纯度高，没有引入其它金属离子；逐滴加碱法所得PAC盐基度稍高（B=25％－45％），但含有大量钠离子且Alb含量不高；氢氧化铝法所得PAC盐基度较高（B=50．6％），但也引进了其它金属离子，优点是所制备碱式氯化铝Alb含量较前二者高（三者Alb含量比例为1：9．3：17．2），达到了国标GB15892—1995的要求。

Polyaluminum chloride（PAC） is prepared by three method, which includes aluminum chloride hydrolyzing, dropping alkali and aluminum hydroxide method. The analysis and comparism of those method are carried out by Al - ferron complexation timed spectrophotometric method and IR spectra methodo The results are concluded that when the PAC prepared through hydrolyzing, the basicity （B） is low （ B = 4% - 8% ）, but the purity of the product without other metal ion is high;the PAC prepared through dropping alkali method,the B of PAC is higher（ B = 25% - 45% ）, but there exist a large amonnt of Na^＋ in the product and Alb content is not high; while the PAC prepared through aluminum hydroxide method,the B of PAC is the highest（ B = 50.6% ） ,and the Alb content in the product is the highest among three method （the proportion of Alb content among three method is 1 ： 9.3 ： 17.2 ）, which can meet the requirement of National Standard of GB15892 - 1995.