Utilization of an Amide-Based Collector in Fluorite Flotation
2025
Peng Liu | Yuhui Tian | Chun Zhang | Mengjie Tian | Wei Sun
Fluorite is commonly associated with calcite and other Ca-bearing gangue minerals in nature. Fluorite and its associated Ca-bearing gangue minerals share similar surface active sites involving Ca2+ ions and have comparable surface properties, making their flotation separation challenging. Traditional fatty acid collectors, such as oleic acid, suffer from poor selectivity. This study investigates the use of N-hydroxy-N-phenyloctanamide (HPOA) as a novel collector for fluorite, with the goal of improving its flotation separation from Ca-bearing gangue minerals. Flotation tests demonstrate that HPOA provides superior selectivity compared to oleic acid in separating fluorite from calcite. Research on the adsorption capacity of HPOA on mineral surfaces shows that, under equivalent testing conditions, HPOA shows greater adsorption amounts on fluorite than on calcite. As a result, HPOA has a superior collecting capacity in fluorite flotation. First-principles calculations reveal that HPOA adsorbs on the fluorite surface by forming chemical bonds with Ca2+ ions via its hydroxyl and carbonyl groups. Moreover, HPOA exhibits strong adsorption on fluorite surface, as indicated by more significant shifts in the binding energies of Ca2+ ions on fluorite compared to calcite after HPOA adsorption. This study highlights the potential of amide-based collectors to improve fluorite flotation and offers valuable insights into the development of more selective flotation reagents.
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