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• W3190926295 abstract "• Copper-ammonia ions improved micro-fine ilmenite flotation recovery by~18% with NaOL at pH 5.5. • ToF–SIMS technique was innovatively used to determine ilmenite surface properties. • H 2 SO 4 and H 2 O 2 significantly promoted valence transitions of iron on ilmenite surfaces from Fe (II) to Fe (III). • Copper-ammonia ions enhanced adsorptions of molecule/colloid oleate and oleate compounds of Fe and Cu. The efficient recovery of micro-fine particle ilmenite using froth flotation remains a challenge. In this study, a novel method for the activation flotation of micro-fine particle ilmenite was performed. Micro-flotation experiments, solution chemistry, X-ray photoelectron spectroscopy, reaction thermodynamic and Time-of-flight secondary ion mass spectrometry analysis were conducted to investigate the activation mechanism. The results indicated that the flotation recovery was increased by ~ 18% with the addition of H 2 SO 4 -H 2 O 2 and [Cu(NH 3 ) 4 ] 2+ ions at pH value 5.5 using sodium oleate. The dominant RCOOH (l) species and RCOO − ions could interact with Fe and Cu active sites on ilmenite surfaces via chemical adsorption. The treatment of H 2 SO 4 -H 2 O 2 promoted the valence transition of iron from Fe (II) to Fe (III). Eventually, the proportion of Fe (III) increased from 44% to 66%. This activity reinforced the formation of Fe(OL) 3 complex under a low-acidic condition and it was well consist with the corresponding results of reaction thermodynamic. [Cu(NH 3 ) 4 ] 2+ ions adsorbed onto ilmenite surfaces and further improved the surface activity of ilmenite. Accordingly, the normalized peak intensities of C 18 H 33 O 2 − increased from 1.42 × 10 −2 to 1.80 × 10 −2 . Insights into copper-ammonia ions activation for the micro-fine particle ilmenite was mainly attributed to the dual oxidization of H 2 SO 4 and H 2 O 2 , as well as the enhanced adsorptions of molecule/colloid oleate and oleate compounds of Fe and Cu. Results enriched basic theories of ilmenite flotation." @default.
• W3190926295 created "2021-08-16" @default.
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• W3190926295 date "2021-09-01" @default.
• W3190926295 modified "2023-10-17" @default.
• W3190926295 title "Surface modification of ilmenite by introducing copper-ammonia ion and its response to flotation in H2SO4-H2O2 system" @default.
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• W3190926295 doi "https://doi.org/10.1016/j.mineng.2021.107102" @default.
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