Under conditions of controlled p1-I. investigations have been conducted into the behavior of the electrophoretic mobility ((-potential) of a crystalline silica suspension flocculated by ( 1) aluminum perchlorate, ( 2 ) a polyethylenimine, and ( 3 ) both reagents used in conjunctionThe findings of this study have been correlated with the results of refiltration measurements with respect to the amount of polymer necessary to optimize the filtration rate compared to the amount of polymer necessary i o lower the electrophoretic mobility to zero. The effect of p H on the mobility and filtration rate of crystalline and ainorphous silica suspensions has been investigated. Exploratory observations on the crystalline silica-polyacrylamide system have also been included
Further investigations were conducted into the filtration behavior of crystalline and amorphous silica dispersions flocculated by high polymers. Four new cationic and anionic flocculants were tested for filtration improvement with amorphous silica suspensions and found to be effective. In all cases, the relationship between the optimum polymer concentration and the solid content remained linear. The effect of changing the chemical nature of the polyelectrolytes as well as the surface area and crystalline structure of the silica was probed using suspensions of sized crystalline silica with Superfloc 16 (weakly anionic) , , and PAM 3 (weakly anionic) as flocculating agents. The relationships between the optimum polymer concentration and the solid content appeared to be dependient upon the size of silica particles in suspension.
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