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Precipitated calcium carbonate (PCC) was flocculated with cationic polyacrylamide (CPAM) in the presence of dextran sulfate (DS). The charge density of the CPAM had little effect on the extent of flocculation. The effect of changing the order of addition of DS and CPAM was studied, including premixing CPAM and DS before addition of DS. Results were discussed in terms of competition of the particles...
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