Studies of the ion flotation by poly(ethyleneimine) resin.

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Flotation of Crystal violet (CV+), neucoccin (NO−), CrO42−, PO43−, Fe3+, and Cu2+ ions was studied with use of poly(ethyleneimine) resin (PEI) as an adsorbent, Na-polyacrylate or polyacrylamide as a coagulant and sodium dodecyl sulfate or hexadecyltrimethylammonium chloride as a frother. In line with the results of adsorption studies, NC−, PO43−, and CrO42− ions were effectively floated from their dilute solutions but CV+ was not floated so much. The most effective flotation was attained for CrO42− ions, a rapid initial decrease in concentration due to the flotation within 30 s being followed by a gradual decrease and nearly 100% flotation achieved within 10 min for a dilute solution. The rate of flotation follows a bimolecular reaction. The activation energy of flotation, 28.03 kJ mol−1, is equal to that of CrO42− ion adsorption by PEI. Flotation of Fe3+ and Cu2+ ions was effectively carried out through chelate formation of these ions with PEI.
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