Impact Factor:4.765
DOI number:10.1016/j.mineng.2018.04.012
Journal:Minerals Engineering
Key Words:Cassiterite; Flotation; Adsorption mechanism; Density functional theory; First-principle calculations
Abstract:Using microflotation experiments, this study investigated the effect of Pb2+ ions on flotation performance of cassiterite (SnO2) by using benzohydroxamic acid (BHA) as collector. Flotation results showed that floatability of cassiterite significantly improved after addition of Pb2+ ion to the process. Adsorption behaviour and mechanism of BHA on the inactivated and Pb-activated cassiterite surface were further explored by adsorption experiments, zeta potential measurements, X-ray photoelectron spectroscopy analysis and first-principle density functional theory calculations. Experimental and computational results consistently suggested that the adsorbed Pb atoms can coordinate with two O atoms of the two hydroxyl groups on the cassiterite surface. BHA molecules can form two coordination bonds with one Pb ion adsorbed on the cassiterite surface, resulting in a five-membered chelating ring. The proposed adsorption mechanism can be extended to the vast majority of interface assembly systems.
First Author:田孟杰
Indexed by:Journal paper
Discipline:Engineering
First-Level Discipline:Mining Industrial Engineering
Document Type:J
Volume:122
Page Number:327-338
Translation or Not:no
Included Journals:SCI