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dry ore beneficiation technology

dry ore beneficiation technology

Dry Benefication Of Low Grade Iron Ore Fines Using a Tribo ...

Iron ore is the fourth most common element in earths crust . Iron is essential to steel manufacturing and therefore an essential material for global economic development 1 2. Iron is also widely used in construction and the manufacturing of vehicles . Most of iron ore resources are composed of metamorphosed banded iron formations in which iron is commonly found in the form of oxides, hydroxides and to a lesser extent carbonates 4 5. A particular type of iron formations with higher carbonate contents are dolomitic itabirites which are a product of the dolomitization and metamorphism of BIF deposits . The largest iron ore deposits in the world can be found in Australia, China, Canada, Ukraine, India and Brazil . The chemical composition of iron ores has an apparent wide range in chemical composition especially for Fe content and associated gangue minerals . Major iron minerals associated with most of the iron ores are hematite, goethite, limonite and magnetite 1,5. The ma...

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Materials Two fine low grade iron ores were used in this series of tests. The first ore consisted of an ultrafine Fe ore tailings sample with a D50 of 20 µm and the second sample of an itabirite iron ore sample with a D50 of 60 µm. Both samples present challenges during their beneficiation and cannot be efficiently processed through traditional desliming flotation magnetic concentration circuits due to their granulometry and mineralogy. Both samples were obtained from mining operations in Brazil. The first sample was obtained from an existing desliming flotation magnetic concentration circuit. The sample was collected from a tailings dam, then dried, homogenized and packed. The second sample is from an itabirite iron formation in Brazil. The sample was crushed and sorted by size and the fine fraction obtained from the classification stage later underwent several stages of desliming until a D98 of 150 µm was achieved. The sample was then dried, homogenized and packed. Particle size d...

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Samples Mineralogy The XRD pattern showing major mineral phases for the tailings and itabirite samples are shown in Fig 4. For the tailings sample the main Fe recoverable phases are goethite, hematite and magnetite, and the main gangue mineral is quartz . For the itabirite sample the main Fe recoverable phases are hematite and magnetite and the main gangue minerals are quartz and dolomite. Magnetite appears in trace concentrations in both samples. Pure hematite, goethite, and magnetite contain 69.94%, 62.85%, 72.36% Fe, respectively. D patterns. A Tailings sample, B Itabirite sample Bench scale experiments A series of test runs were performed on each mineral sample aimed at maximizing Fe and decreasing SiO2content. Species concentrating to E1 will be indicative of a negative charging behavior while species concentration to E2 to a positive charging behavior. Higher belt speeds were favorable to the processing of the tailings sample; however, the effect of this variable al...

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The bench scale results presented here demonstrates strong evidence of charging and separation of Fe bearing minerals from quartz using triboelectrostatic belt separation. For the tailings sample Fe content was increased from 29.89% to 53.75%, on average, at a mass yield of 23.30%, which corresponds to Fe recovery and silica rejection values of 44.17% and 95.44%, respectively. For the itabirite sample Fe content was increased from 47.68 % to 57.62%, on average, at a mass yield of 65.0%, which corresponds to Fe recovery and silica rejection values of 82.95% and 86.53%, respectively. These results were completed on a separator that is smaller and less efficient than the STET commercial separator. Experimental findings indicate that for both tailings and itabirite samples the maximum achievable Fe content will depend on the minimum achievable quartz content. In addition, achieving higher Fe grades may be possible by means of a second pass on the STET belt separator. The results of this...

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