Abstract
IN recent years it has become common to speak of the flocculation of clay by calcium salts as being anomalous, the particular anomaly being that whereas clay suspensions containing a little sodium chloride are stabilised by the addition of sodium hydroxide, in the case of calcium the flocculation is said to be facilitated rather than repressed by the addition of the alkali. Careful experiments, however, made with a highly purified clay suspension, have convinced us that this anomaly does not exist, and that calcium and sodium compounds behave alike except in respect to the concentration required for flocculation. The following figures show the concentration in equivalents of cation required for flocculation to be half completed in one hour, this being determined nephelometrically:
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JOSEPH, A., OAKLEY, H. The Anomalous Flocculation of Clay. Nature 117, 624 (1926). https://doi.org/10.1038/117624a0
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DOI: https://doi.org/10.1038/117624a0
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