The Adsorbing Colloid Flotation of Fluoride Ion by Aluminum Hydroxide in Aqueous Media
- 1 August 1975
- journal article
- research article
- Published by Taylor & Francis in Separation Science
- Vol. 10 (4) , 417-424
- https://doi.org/10.1080/00372367508058030
Abstract
Up to 15.7 ppm fluoride can be removed from solution, pH 7.3 to 7.8, by adsorption onto colloidal aluminum hydroxide at a concentration of 40 ppm Al. This adsorbing colloid-adsorbed ion combination is then removed by foaming with 40 ppm sodium lauryl sulfate. After 30 min the concentration of fluoride is 0.0 ppm. The concentration of aluminum is also 0 ppm. Efficiency of removal slowly decreases with increasing ionic strength. Chloride ion interference is minimal.Keywords
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