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Xiao J.,Key Laboratory of Vanadium Titanium Magnetite Comprehensive Utilization | Xiao J.,Southwest University of Science and Technology | Zhang Y.,Key Laboratory of Vanadium Titanium Magnetite Comprehensive Utilization | Zhang Y.,Institute of Multipurpose Utilization of Mineral Resources | And 3 more authors.
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | Year: 2015

For the sedimentary pattern hematite and limonite-siderite ores in Qijiang of Chongqing, a segregation roasting-low intensity magnetic separation flowsheet was proposed to upgrade iron. Ores, calcium chloride and coke were mixed and put into roasting furnace to undergo segregation roasting. After being transferred from weak to strong magnetic mineral, iron was recovered by low intensity magnetic separation from roasting ores. The results show that in the roasting ores, new ore phases dominated by magnetite (Fe3O4), metallic iron (Fe) and a few ferrous oxide (FeO) are generated, and effective separation of iron minerals as well as other impurities can be achieved. The iron concentrate separation characterized by 72.02% of iron grade, 0.080% of sulfur mass fraction, 0.053% of phosphorus mass fraction, 82.09% of iron recovery can be obtained under segregation roasting temperature of 950 ℃, segregation roasting time of 60 min, calcium chloride mass fraction of 4%, coke mass fraction of 15%, low intensity magnetic field intensity of 0.10 T and iron ore concentrates mass fraction of 95% of grinding fineness less than 0.038 mm. The effect of upgrading iron is obvious. © 2015, Central South University of Technology. All right reserved. Source


Liu X.,Chinese Academy of Geological Sciences | Liu X.,Key Laboratory of Vanadium Titanium Magnetite Comprehensive Utilization | Huang G.-Y.,Changsha Institute of Mining Research | Li C.-X.,Chinese Academy of Geological Sciences | And 3 more authors.
Minerals Engineering | Year: 2015

Abstract Ilmenite and titanaugite have very similar physiochemical properties. Iron, titanium, calcium, magnesium, and other metal ions exist on the surface of both minerals, making it difficult to separate the two minerals. In this study, oxalic acid was used as a depressant in the microflotation of ilmenite and titanaugite and the depressive effect of oxalic acid toward titanaugite was demonstrated. Through a series of microflotation, oxalic acid composition analysis, reaction thermodynamic calculations, and XPS analysis, oxalic acid was found to significantly and selectively inhibit titanaugite. Oxalic acid was adsorbed onto mineral surfaces via a chemical chelating reaction with metal ions, predominately Ca2+. Therefore, oxalic acid selectively depressed titanaugite during ilmenite flotation. © 2015 Elsevier Ltd. Source


Jie Z.,Southwest University of Science and Technology | Weijun L.,Southwest University of Science and Technology | Weiqing W.,Southwest University of Science and Technology | Weiqing W.,Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling | And 4 more authors.
Mineralogy and Petrology | Year: 2015

The flotation characteristics of native ilmenite (IL-N) and beach placer ilmenite (IL-BP) with sodium oleate (NaOL) were investigated through micro-flotation tests, zeta-potential measurements, absorbed amount measurements, and Fourier transform infrared spectroscopic (FT-IR) analysis. The results show that IL-N can float well at the pH region of 4.5 to 7.5, whereas IL-BP floats well at pH 4.5 to pH 6. The flotation recovery of IL-N is invariably higher than that of IL-BP in alkaline solution. In the presence of NaOL, the zeta-potentials of both minerals are negative in the pH range. The absorbed amount of NaOL increased rapidly with the increase in the pH value in acid solution and decreased rapidly with the increase in the pH value in alkaline solution. In weak alkaline conditions, the ions of Ca (II) and Mg (II) become important activated sites for the adsorption of NaOL onto the ilmenite surface. The FT-IR analysis and absorbed amount measurements verified that the adsorption of calcium oleate and magnesium oleate on IL-N more than on IL-BP at the same pH value. A larger amount of Ca (II) and Mg (II) in IL-N than IL-BP results in good floatability as exhibited in the flotation tests. © 2014, Springer-Verlag Wien. Source


Liu W.,Southwest University of Science and Technology | Zhang J.,Southwest University of Science and Technology | Wang W.,Southwest University of Science and Technology | Deng J.,Key Laboratory of Vanadium Titanium Magnetite Comprehensive Utilization | And 5 more authors.
Minerals Engineering | Year: 2015

The flotation behaviors of ilmenite, titanaugite, and forsterite using sodium oleate as the collector were investigated using microflotation experiments, zeta-potential measurements, Fourier transform infrared (FT-IR) analyses, X-ray photoelectron spectroscopy (XPS) analyses and the artificially mixed minerals flotation experiments. The results of the microflotation experiments indicate that ilmenite exhibits good floatability when pH > 4.0. Titanaugite possesses a certain floatability at pH 4.0-6.0 and pH > 10.0, and forsterite possesses certain floatability at pH 5.0-7.0 and pH > 9.0. The results of FT-IR and XPS analyses indicate that sodium oleate mainly interacts with Fe, resulting in ilmenite flotation; that the Ca and Mg on the titanaugite surface chemically reacted with sodium oleate, and that the Mg on the forsterite surface chemically reacted with sodium oleate under acidic condition. However, sodium oleate mainly reacted with the Ca and Mg on the titanaugite surface, whereas sodium oleate mainly reacted with the Mg on the ilmenite and forsterite surfaces under alkaline conditions. The results of the artificially mixed minerals flotation experiment demonstrate that the concentrate of TiO2 grade increases from 16.92% to 30.19% at pH 5.4, which represents the appropriate conditions for the flotation separation of ilmenite from titanaugite and forsterite under weak acidic conditions. © 2014 Elsevier Ltd. All rights reserved. Source

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