polymerization of aluminumcoagulantforlow molecular weightcrystallinesaltofaluminumandthe fundamental difference betweentraditionalinorganiccoagulantis,multi-hydroxycomplexesandpolymerstructureofpoly aluminum chloridebytheshapechangingcompositionfor theamorphousinorganic polymer,thepolymerization of aluminum is widely used inlife,production water,sewage,industrial waste waterpurification,lowtemperatureandlow turbidity waterpurification,paper, petrochemical, power plantashwaste waterrecycling,printing and dyeing, wool, wastetoCODBODandSSofdecolorizationpurification.