Abstract
Abstract The flotation of Cd2+ ions was investigated in the presence and absence of Zn2+ ions. It was found that the flotation efficiency of Cd2+ ions in the Cd2+–anionic surfactant system is markedly small in the presence of Zn2+ ions, but the flotation efficiency of Cd2+ ions in the Cd2+–bentonite–cationic surfactant system (adsorbing particle flotation) decreased only slightly in the presence of Zn2+ ions. The flotation efficiency in the latter case was further increased by the addition of 3 ppm of polyacrylamide. The doubling of the flotation reagents and time did not effectively increased the flotation efficiency of Cd2+ ions in the presence of Zn2+ ions, but the two-stage flotation did. It was confirmed that the adsorbing particle flotation of Cd2+ ions would be an excellent method in the presence of Zn2+ ions.
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