期刊
MINERALS ENGINEERING
卷 122, 期 -, 页码 327-338出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.mineng.2018.04.012
关键词
Cassiterite; Flotation; Adsorption mechanism; Density functional theory; First-principle calculations
资金
- Natural Science Foundation of China [51704330, 51374247]
- National 111 Project [B14034]
- Collaborative Innovation Center for Clean and Efficient Utilization of Strategic Metal Mineral Resources
- Innovation Driven Plan of Central South University [2015CX005]
- National Science and Technology Support Project of China
- Startup Fund of Central South University for Young Teachers [502044001]
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.
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