Abstract: In order to research the effect of Fe³⁺ and Na⁺ dissolved from aegirite on the flotation of specularite and aegirite in dodecylamine system， single mineral flotation experiment was carried out with 0.044~0.074 mm size fraction minerals of specularite and aegirite. The mechanism was analyzed from views of Zeta potential measurement and solution chemical calculation. The results showed that dodecylamine had a good effect on the collection of specularite and aegirite， while Fe³⁺ showed a stronger inhibitory effect on specularite than that of aegirite， and Na⁺ had no significant depression effect on the floatability of these two minerals. The added Fe³⁺ and Na+ right shifted the surface potential of these two minerals， which wakened the electrostatic adsorption of dodecylamine. Fe³⁺ adsorbed on the surface of these two minerals mainly in the form of hydrophilic hydroxide precipitation， which increased the hydrophilicity of specularite and aegirite and inhibited their floatability.

Key words: Specularite, Aegirite, Dodecylamine, Flotation, Metal ions