Centers for Ethio Mines Development

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Browsing Centers for Ethio Mines Development by Subject "Beneficiation"

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    Beneficiation of Blended Coal by Froth flotation Technique, In The case of Kripto Coal Mining and Chemicals PLC Elasanchano Woreda Konta Zone South West Region of Ethiopia
    (Addis Ababa University, 2025-03) Ewunetu Mitku; Mulugeta Sisay (PhD); Mamaru Genetu (Mr.) Co-Advisor
    Beneficiation of blended coal in the case of Kripto coal mining and chemicals plc located Elasanchano woreda konta zone, south western part of Ethiopia using kerosene as a collector n-octanol as afrother sodium silicate as a depressant with aeration speed of 1850 r/pm to facilitate the formation of small bubble enhance the calorific value of blended coal in the three flotation parameters studied in this project. which is particle size, frother dosage and flotation time is investigated. The optimal particle size we get maximum combustible recovery and quality is +125+-250 μm particle size which have 35.699% recovery and its heating value measured in boom calorimeter is 6,047.5781Ca/gram. The optimal frother dosage we get maximum recovery and grade is 6ml of n-octanol which have 65.157% recovery and its heating value is 6,412.7735 Ca/gram. The optimal flotation time we get high combustible recovery and quality of coal is 10 minute which have 70.426% of recovery and its calorific value is 5,894.4779 Cal/gram. Generally, froth flotation technique is good for environmentally friend method for the reduction of sulfur content in coal which reduce the release of SO2 gas cause for the formation of acid rain and health risks including lung cancer in humans. This project reduces the sulfur content of blended coal 0.68% to 0.44%. So, froth flotation is an appropriate method for the enhancement of heating value and proximate and ultimate characteristics of coal by removing the impurities from coal.
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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%.
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    Talc Beneficiation through Flotation Techniques in Ethiopia: A Case Study of Sidama Regional State, Hoko Woreda
    (Addis Ababa University, 2025-03) Wakjira Tesfaye; Anteneh Marlign (PhD); Desisa Yadeta (PhD) Co-Advisor
    Talc is a hydrated magnesium layered silicate mineral. The major uses are in the plastics industry, rubber, cosmetics, ceramics, and pharmaceuticals. Properties include increasing stiffness and resistance to heat and are suitable for talcum powder and tablet formulations since it is soft and inert. This project discusses the flotation parameters of talc beneficiation, sourced from the Sidama Regional State in Ethiopia, using high-grade and high-recovery outputs. The flotation techniques have always remained favorable for talc-beneficiating processes, especially because the process achieves gangue mineral separation. The experiments showed that under optimum conditions, the pH was 11, the collector dosage was 1.2 kg/ton, and the depressant dosage was 1.0 kg/ton, maintaining the pulp density at 200 g/l and an impeller speed of 1100 rpm. Under these conditions, the talc recovery was 74.25% in the flotation process. The chemical analysis of the resulting talc concentrate showed significant improvements: SiO₂ increased from 58.2% to 73.01%, while MgO increased from 24.22% to 24.62%. The Fe₂O₃ content decreased remarkably from 14.37% to 1.66%, reflecting a successful removal of impurities and a substantial increase in the purity of the final product. Results indicate that oleic acid and kerosene oil, with sodium hexametaphosphate as a depressant and propyl glycol as a frother, gave the best recovery with a grade improvement. Such a scheme of optimization of flotation conditions to improve talc quality is important in fulfilling these industrial applications in the industries of ceramics. This work contributes to an understanding of talc beneficiation techniques and forms the ground for further research on enhancing the talc recovery methods in Ethiopia and meeting the requirements of various industries for economic development.