Abstract
Behavior and mechanism of Ca 2+ and Fe 3+ adsorption on spodumene surface were investigated by micro flotation tests, zeta potential measurements, and density functional theory (DFT) calculation methods. The micro flotation tests showed that Ca 2+ and Fe 3+ activated the flotation of spodumene remarkably. However, the effect of Fe 3+ was more significant than that of Ca 2+ . Additionally, Fe 3+ significantly changed the zeta potential of spodumene while Ca 2+ showed a little change. Meanwhile, the calculated adsorption energy of Fe 3+ on spodumene surface was much greater than that of Ca 2+ indicating that Fe 3+ is more apt to be adsorbed on spodumene surface than Ca 2+ . The value of bond population in Ca- O illustrated that the bond of Ca-O consists of partial covalent proportion and some ionic component. On the contrary, the bond of Fe-O showed a relatively strong covalent property. The partial density of states (PDOS) of free Ca/Fe and the reacted O atom on spodumene (110) surface before and after the adsorption showed that Fe 3d orbital and O 2p orbital formed hybridization. The density of states (DOS) near the Fermi level of spodumene surface after adsorption with Fe 3+ was much stronger than that with Ca 2+ .
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