Chiang Mai Journal of Science

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Effects of sodium hexametaphosphate (NaPO₃)₆, sodium sulphide (Na₂S) and stearyl amine (CH₃(CH₂)₁₇NH₂) on froth flotation of a hemimorphite zinc ore were studied by zeta potential measurement and infrared spectroscopy. The results from zeta potential measurement confirmed the roles of (NaPO₃)₆ as anionic dispersant, Na₂S as anionic sulphidiser and pH regulator, and CH₃(CH₂)₁₇NH₂ as cationic collector. Indirect effects of the adsorbed anionic species from the sodium hexametaphosphate and the sodium sulphide on the symmetry of Si-O and Zn-O bonds on the ore surface were successfully detected by infrared spectroscopy. These effects resulted in a shift of ν_s(Si-O) and/or n_a(Si-O), and a shift or splitting of Zn-O stretching.

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