Abstract
This study investigated the laws affecting flotation properties of monazite minerals after roasting pretreatment. The flotation performance and adsorption mechanism of monazite after roasting were investigated systematically through simulation tests, which included micro-flotation tests, Brunauer–Emmett–Teller (BET) analysis, contact angle measurement, zeta potential analysis, scanning electron microscopy energy dispersive spectroscopy, Fourier transform infrared analysis, X-ray photoelectron spectroscopy, and DFTB+. The results of the microflotation tests indicated that octyl hydroxamic acid (OHA) had a superior recovery effect on monazite at a pH of ∼9. The flotation performance of OHA on monazite was significantly better than those of salicylhydroxamic acid (SHA) and benzohydroxamic acid (BHA) under the same conditions. A molecular model of monazite after roasting was simulated and structurally optimized using DFTB+. The adsorption energies were calculated for SHA, BHA, and OHA, which confirmed the strong and stable adsorption of OHA on the surface of monazite after roasting.
Published Version
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