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Sedimentation Characteristics of Kaolin and Bentonite in Concentrated Solutions

Charakteristika sedimentacie kaolinu a bentonitu v koncentrovaných roztokoch The sedimentation characteristics of two clays, namely kaolinite and bentonite, were determinated at high clay (5 % wt/vol) and electrolyte (1 N) concentrations using various inorganic-organic compounds. It was observed that the settling behaviour of kaolinite (1:1 clay) and montmorillonite (2:1 clay) is quite different due to the structural differences between these minerals. Although, similar initial settling rates and final sediment volumes were obtained after 24 hours of settling time for kaolin suspensions, the corresponding rates and volumes for bentonite suspensions varied greatly with the used chemical compound. According to the experimental results, a further intensive theoretical and experimental investigation is needed to reveal the mechanism underlying the sedimentation characteristics of clay minerals at high clay and electrolyte concentrations.