A process for preparing liquid polyaluminium chloride coagulant is introduced.It uses kaolin as raw material

which is pretreated

and then roasted

soaked in hydrochloric acid

filtrated

concentrated

mixed for polymerization and finally adjusted for pH.We optimize the process by means of orthogonal text method.The results show that the order of influence degree of the product quality from big to small is: acid-dissolution feedstock ratio

the proportion of pretreated with hydrochloric acid

roasting temperature

...