カオリナイトフロックの凝集構造に及ぼす塩濃度の影響について (第二報) : 凝集領域による影響

概要

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We have very little knowledge on the physical properties of the flock formed during the flocculation process, since it is more difficult to handle, both experimentally and theoretically, clay particles with irregular shapes than the spherical particles of monodispersion. In this study, the flocculation velocity of a kaolinite suspension was measured in a wide region, from the salt level at which flocculation begins to high salt concentration, and we used these data to examine how the porosity and size of the flock depend on the cohesion. The resuits were as follows. In the slow flocculation region of salt level of 0.03mol/l or less, both the diameter and the porosity of the flock increased as repulsive force decreased. However, when the salt level exceeded 0.03mol/l even in the slow speed flocculation region, the flock diameter rapidly decreased, but there was almost no decrease in Porosity. In the rapid flocculation region where only van der Waals forces work, neither flock diameter nor porosity was dependent on the salt concentration. The above results showed ooat the simple change in which ohe kaolinite flock becomes greater and denser did not occur here as the cohesion became stronger.
日本粘土学会の論文
2000-11-30