Centers for Ethio Mines Development

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Browsing Centers for Ethio Mines Development by Subject "Beneficiation"

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    Reverse Anionic Flotation for Potential Beneficiation of Sekota Iron Ore, Northern Ethiopia
    (Addis Ababa University, 2023-09) Tarekegn Dure; Abubeker Yimam (PhD)
    In this project study, hematite ore sample obtained from Sekota area, Northern Ethiopia was used. Main objective of the study is to obtain iron concentrate at possible maximum grade and recovery by using reverse anionic flotation beneficiation method. The effect of oleic acid collector dosage and sieve size fractions were studied and optimized. The chemical and mineralogical characterization of the ore was also determined. Results of chemical analysis using atomic absorption spectroscopy (AAS) showed that the iron ore contains 65.12% Fe2O3 (45.57% Fe). Major gangue minerals were SiO2 (20.62%) and Al2O3 (8.86%) while all other minerals were reported at <1%. Mineralogical descriptions using the X-ray diffraction (XRD) and QEMSCAN BMA showed predominantly hematite and goethite with quartz, kaolinite and clay as gangue minerals while others P and S are in lower amounts. The concentrate 62.96% Fe2O3 with highest grade of 44.07% Fe was obtained with 43.4% Fe recovery in the feed size fraction (−63 μm) adding 3g/t of oleic acid collector. Based on the results obtained from the flotation tests conducted, Sekota iron ore at a sieve size of -75μm and -63μm were able to enhancing both grade and recovery.
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    Reverse Flotation as a Method for Beneficiation of Sekota Iron Ore
    (Addis Ababa University, 2023-06) Temesgen Demissie; Abubeker Yimam (PhD)
    Upgrading low grade Sekota iron ore to reduce the unwanted minerals and improve the quality is necessary to address these issues, in order to produce an acceptable feed for a steel production facility. The primary aim was to use reverse flotation as a beneficiation method for Sekota iron ore, in order to get a last flotation that meets the desired specifications. This process was divided into three stages: crushing, grinding, and flotation. For each of these stages, such as grinding, dosage of collectors, flotation duration, and procedures were determined. In the laboratory, where the samples were obtained, the ore was ground in a size of -0.074mm, using 250 grams of ore, with varying amounts of anionic oleic acid as the collector, 5mg/ton of activator and 5mg/ton of depressant, and floated with 2.0 g/ton of ethanol frother. The slurry was maintained at 10.5 using NaOH throughout the process. Before conducting any optimization tests on the iron ore flotation process, a laboratory procedure was developed to carry out the reverse flotation of the iron ore. The results showed that following these parameters, the flotation process achieved a final concentrate with a grade of 39.16% iron and an iron recovery of 41.29%. In this study, with varying duration of flotation, the iron grade ranged from 40-45% with an iron recovery of approximately 42%.