(106473)New insights into lead ions activation for microfine particle ilmenite flotation in sulfuric acid system: Visual MINTEQ models, XPS, and ToF-SIMS studies

摘要

Recovering microfine particle ilmenite using froth flotation is extremely challenging. In this study, the flotation behaviors of microfine particle (- 38 nm) ilmenite untreated or treated with lead ions using sodium oleate as a collector were studied. Micro-flotation experiments revealed that the ilmenite presented superior floatability at pH 5.5. PbCNO_3)_2 increased the flotation recovery by~12%. Solution component analysis indicated that the presence of lead ions depressed the dissolution of Fe and Ti metal ions on the ilmenite surface. The dominant Pb (ID species and RCOOH_(I) were responsible for ilmenite flotation. Zeta potential measurements suggested that the RCOOH rn and RCOO ~- ions mainly reacted with Fe and Pb on the ilmenite surfaces through electrostatic effects in addition to chemical adsorption. Fourier-transform infrared spectroscopy analysis showed that the new PbOL complex was formed on the ilmenite surfaces. X-ray photoelectron spectroscopy confirmed that the treatment of sulfuric acid promoted the valence transitions of iron ions. The proportion of the surface covered by Fe~(3+)eventually increased from 32.51% to 63.22%. Time-of-flight secondary ion mass spectrometry (ToF-SIMS) provided strong evidence for the increased adsorption of oleate species on the ilmenite surfaces. Accordingly, the intensity of C_4H_7~+ increased from 16,447 to 21089. New insights into lead ions activation for microfine particle ilmenite flotation in sulfuric acid system were mainly attributed to the oxidization of SO_4~(2-) ions and the reinforced absorption of molecule/colloid oleate and PbOL complex compounds.