Beneficiation and Upgrading of Coal Via Dense Media Separation (DMS) In Ankober Woreda, North Shewa Zone
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Date
2023-06
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Abstract
Coal is a type of fossil fuel and a combustible black or brownish-black sedimentary rock, formed when dead plant matter decays into peat and is converted into coal by the heat and pressure of deep burial over millions of years as rock strata and used as a fuel for energy resource. But, coal is usually formed associated with gang mineral (ash) those can decrease combustibility of coal. Thus, to utilize this resource safely and efficiently, coal separation and concentration is required. Density-based rejection of ash is an effective method to remove gangue before the process of coal combustion for the purpose of improving the quality of coal. By using a uniform crushed particle size of coal sample (-4.75+4.5 mm) in different specific gravities of heavy medium (1.4, 1.6, and 1.6), the specific gravity of 1.4 was found to be the optimum parameters to successfully upgrade the coal and improve its calorific value. Based on the results of the float product of 32.8% of concentrated coal and 24% upgraded coal obtained with reduced ash content of 60.72% and 21.79% increase of fixed carbon at specific gravity 1.4 and also it was found that upgrading, floating, fixed carbon as well as ash reduction subsequently decreases in floats as the specific gravity increases unlike volatile matter. From this work, it can be concluded that beneficiation and upgrading of coal by dense media separation method is good technique to produce improved and safely used coal as an energy source for coal-fired utilization.
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Coal, sink-float, DMS, specific gravity, ash reduction, proximate analysis, grade, recovery