1. Studies of the Coagulation Flotation of Bentonite and Its Application to the Removal of Co2+Ions and Fission Products, Ce and Eu
- Author
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Koichi Kobayashi, Kosei Kachi, Hiroshi Sato, Masao Nakamura, and Tsunetaka Sasaki
- Subjects
Aqueous solution ,Pulmonary surfactant ,Chemistry ,Precipitation (chemistry) ,Reagent ,Bentonite ,medicine ,Coagulation (water treatment) ,General Chemistry ,Dispersion (chemistry) ,Chloride ,medicine.drug ,Nuclear chemistry - Abstract
The regions of dispersion, coagulation precipitation, coagulation flotation, and redispersion were determined for aqueous bentonite-cationic surfactant and bentonite-cationic surfactant-polyacrylamide(PAA) systems. The region of coagulation flotation was markedly extended by the addition of PAA to both the lower and higher concentration regions of the cationic surfactant, hexadecyldimethylbenzylammonium chloride(HDBAC), and to the lower concentration region of bentonite. The phenomenon of coagulation flotation was investigated in detail and was applied to the removal of Co2+ ions and nuclear fission products, 144Ce and 155Eu, from an aqueous solution. The composition of the reagents for the maximum efficiency of bentonite flotation corresponded to that of the maximum efficiency of Co2+-ion flotation. The effect of the pH on the flotation efficiency was studied in particular. The maximum flotation efficiency of 96% was obtained at pH 11 for Co2+ ions, 86% at pH 9.7 for 144Ce, and 93% at pH 10.5 for 155Eu. ...
- Published
- 1975
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