Modification of ilmenite surface properties by superficial dissolution method |
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| Affiliation: | 1. Key Laboratory of Solid Waste Treatment and Resource Recycle Ministry of Education, Southwest University of Science and Technology, Mianyang, Sichuan, PR China;2. School of Resources Processing and Bioengineering, Central South University, Changsha, Hunan, PR China;3. State Key Laboratory of Mineral Processing, Beijing, PR China;4. Institute of Multipurpose Utilization of Mineral Resources, Chinese Academy of Geological Science, Chengdu, Sichuan, PR China;1. School of Environment and Resource, Southwest University of Science and Technology, Mianyang, Sichuan 621010, PR China;2. Key Laboratory of Solid Waste Treatment and Resource Recycle Ministry of Education, Southwest University of Science and Technology, Mianyang, Sichuan 621010, PR China;3. Key Laboratory of Vanadium-titanium Magnetite Comprehensive Utilization, Ministry of Land and Resources, Chengdu, Sichuan 610000, PR China |
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| Abstract: | Acid surface dissolution as a pretreatment method converts Fe2+ ions on the ilmenite surface to Fe3+ ions. XPS analysis showed that the content of Fe3+ increases from 48.5% to 59.8% after surface dissolution for 15 min in a solution of sulfuric acid with a concentration of 10%. This conversion, without any phase transformation, decreases the zeta potential of ilmenite in a wide pH range, resulting in a shift in IEP (Iso-Electric Point) from a pH of 5.4 to 2.3. FTIR spectra and zeta potential measurements showed that the increase of oleate ions adsorption on the ilmenite surface, resulting from the surface dissolution process, is insignificant. After surface dissolution, the formation of more ferric iron oleate species (Ksp = 10−29.7) being more stable than ferrous iron oleate (Ksp = 10−15.5) compounds yields an increase of ilmenite hydrophobicity and floatability in a wide pH range. Using 3.65 × 10−4 M sodium oleate at a pH of 6.3, the maximum flotation recoveries are obtained as 73.5% and 92% for non-treated and acid pretreated ilmenite, respectively. |
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| Keywords: | Ilmenite Flotation Acid surface dissolution Surface properties Zeta potential |
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