Abstract
An anionic polyacrylamide-grafted starch (St-g-APAM) flocculant for the coal slurry waste water, was prepared by using corn starch and acrylamide (AM) as monomers, acrylic acid (AA) as anionic monomer through solution polymerization. The effects of initiator concentration, reaction temperature, and monomer concentration on percentage of grafting and the grafting efficiency were investigated. The results show that the optimal conditions of the polymerization are as follows: the monomer to substrate ratio of 2.0, AM:AA ratio of 2:1, potassium persulfate of 0.7 x 10-3mol/L, reaction time of 4h, the reaction temperature of 50°C. The additional dosage of St-g-APAM is varying between 10 and 20 mg/L to obtain good flocculation capability.
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