在盐酸直接酸浸铝矾土制碱式氯化铝的基础上 ,聚合一定量的 Fe3 + 和 SO4 2 -,合成复合型碱式氯化铝 ,其 Al2 O3 含量为 1 0 .2 %～ 1 0 .8% ,Fe2 O3 含量为 2 .8%～ 4 .0 % ,盐基度含量为 64 %～ 75% ,硫酸根的含量小于 3 .5% .红外光谱分析和电镜观察结果表明 ,该复合型碱式氯化铝是一种含多核聚铁及聚铝与氯离子及硫酸根配位的新型无机高分子混凝剂 . On the basis of hydrochloric acid acid-bauxite made of basic aluminum chloride, a certain amount of Fe3 + and SO42- are polymerized to synthesize composite basic aluminum chloride with Al 2 O 3 content of 10.2% -1 0 .8% Fe2 O3 content of 2.8% to 4.0%, the basic content of 64% to 75%, the content of sulfate less than 3.5%. Infrared spectroscopy and electron microscopy results show that the Complex Alkali Aluminum Chloride is a new kind of inorganic polymer coagulant containing multi-nuclear poly-iron and poly-aluminum coordinated with chloride and sulfate.