Activation of Dolomite Flotation by Ferrous Hydroxide and Carbonate

The major problem with Carlin-type gold deposit flotation is that the high dolomite content in concentrate decreases quality of gold. Further, activation mechanisms involved are still not fully understood. Herein, correlation Fe2+ conversion xanthate adsorption and was investigated to reveal effect embedded pyrite. Flotation tests suggested rather than Fe3+ improved floatability from 20% 45%. Contact angles thermodynamic indicated hydrophobicity Fe2+-modified corresponds xanthate. Importantly, time-of-flight secondary ion mass spectroscopy (Tof-SIMS) x-ray photoelectron (XPS) attributed formation Fe(OH)2 FeCO3. coordination model successfully elucidated selective between Fe(OH)2, FeCO3 FeOOH surfaces. density function theory (DFT) simulation calculation performed identify reaction rate at atomic level, states (DOS) also conducted verify conclusions electronic level. This study presents important surface chemistry evidence for understanding regulating poor selectivity deposits.