Research on the Preparation of One Type of New Flocculant and It's Flocculation Property

In order to ameliorate the dehydration property of the sludge produced by poly aluminum chloride widely-used in water treatment at the present day.One new type of flocculant-poly aluminum calcium chloride was prepared with the materials of aluminum oxide and calcium oxide by baking at high temperature,dissolving in hydrochloric acid,polymerization and dryness process.The content of aluminum oxide and calcium was determined by complexion titration and salinity was determined by acid-base titration.The treatment effect of the new flocculant was examined by determinating the suspended matter in wastewater.The result showed that baking play an important role in the preparation of poly aluminum calcium chloride.The product has good properties when the baking temperature is 1?100?℃,the proportion of aluminum oxide in the materials is 70% and the dissolving time is 3 hour.The flocculation efficacy of the new flocculant-poly aluminum calcium chloride and the dehydration property of the sludge produced by poly aluminum calcium chloride is super to that of industrial poly aluminum chloride.The conclusion can be obtained that baking is propitious to synthesize poly aluminum calcium chloride,and the efficiency of poly aluminum calcium chloride is best when the proportion of aluminum oxide is 70%,acid dissolving time and volume of hydrochloride acid almost has no effect on the content of calcium and the flocculation efficacy of poly aluminum calcium chloride and the dehydration property of the sludge produced by poly aluminum calcium chloride is better than that of industrial poly aluminum chloride.