Flotation behavior of aegirite was investigated by single mineral flotation tests at different pH values and Fe3+ concentrations which dodecylamine (DDA) was used as the collector. The effect of iron ion on the separation behavior of aegirite and specularite was studied by using artificial mixed minerals flotation. Zeta potential measurement, hydrolysis component concentration calculation of iron ion, Boltzmann theory analysis, and molecular dynamics simulation were conducted to study the depression mechanism of iron ions on aegirite in dodecylamine system. The results indicated that iron ions could depress aegirite in great extent. When the initial pH value was 6.8, and concentration of collector dodecylamine was 3.6×10?4 mol/L, the recovery rate of aegirite was 75.72%, while the recovery rate decreased to 25.32% with 3.0×10?4 mol/L iron ions in the pulp. The iron grade of froth product of artificial mixed minerals flotation decreased from 34.20% to 28.71%, while the recovery rate of iron declined from 33.29% to 18.35%. Iron ions adsorbed on the surface of aegirite in the form of hydrophilic hydroxyl complexes precipitates in the experiment range pH=3?11, which increased the hydrophilicity of aegirite and decreased its floatability. The adsorption of iron ion on aegirite surface shifted the point of zero charge from 2.14 to 6.70, which increased the surface electropositivity of aegirite and weakens the electrostatic adsorption between dodecylamine and aegirite, leading to the decrease of the RNH3+ concentration in interfacial layer of aegirite. The existence of iron ions resulted in the looser structure of the DDA adsorption layer and the shift of DDA concentration profile in the normal direction of aegirite (110) surface to the positive direction which decreased the floatability of aegirite. The results of the research improved better understanding of the role of metal ion in mineral flotation.
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