Adsorption behavior of calcium ions on Na-kaolinite and the adsorption and flocculation behavior of Na-kaolinite by polyacrylamide in the presence of calcium species in solution have been investigated. Parameters examined in calcium adsorption experiments include pH, conditioning time of the suspension with calcium, and calcium concentration. The effect of calcium on adsorption of polyacrylamide and hydrolyzed polyacrylamide by the kaolinite and on its flocculation is determined. Also the effect of the polymer on calcium adsorption is examined. Adsorption of calcium occurs only under pH conditions where it hydrolyzes to CaOH+ and Ca(OH)2. Calcium adsorption (abstraction) is sensitive to the presence of polymer as well as to stirring conditions. Interestingly, above pH 8, stirring and addition of polymer (HPAM 33) were found to cause calcium desorption suggesting detachment of precipitate from the kaolinite surface.
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Ateşok et al. (1988) studied this question.
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