Califloc is an efficient flocculant for hematite ore fines. Addition of $CaCl_2$ improves settling rate and clarity significantly at alkaline pH; at acidic pH no addition of Ca is necessary to achieve flocculation. The sequence in which Ca and the flocculant are added is an important factor for the efficiency of flocculation. At higher pH, added Ca strongly interacts with the flocculant.
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