アルカリ状態において塩濃度が Na カオリナイトの凝集に及ぼす影響「

概要

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In this study, mechanism of flocculation for an Na Kaolinite-water system dependent on salt concentrations in alkaline bulk water (pH 10) were examined rheologically. Consequently, it became clear that when NaCl was added to dispersed Na kaolinite suspension, kaolinite flocculated in two stages. Fiest, for salt concentrations between 2.0×10^<-3> mol/l and 1.0×10^<-2>mol/l , flocculation occurred with an increase in the salt concentration under stable conditions. In the flow state, a hard flock formed by the bonding of dispersed particles was also developed as the salt concentration increased. On the other hand, when the salt concentration exceeded 1.0×10^<-2>mol/l, and subsequent increased salt concentration the flock in the flow state could no longer be developed. Although flocculation in the caly-water system develops with increasing salt concentration, the degree of development was less than compared in salt concentrations ranging from 2.0×10^<-3> mol/l to 1.0×10^<-2> mol/l . These results indicate that an increase in salt concentration promotes an intense bonding between clay particles of low salt concentrations (2.0×10^<-3>mol/l〜1.0×10^<-2> mol/l). And although the increase in the intense bonding force between particles did not occur in high salt concentrations (more than 1.0×10^<-2>mol/l), flocculation caused by weak bonds none the less proceeded.
日本粘土学会の論文
1994-09-27