Beneficiation of Coals: A Review
Journal Title: International Journal of Engineering Sciences & Research Technology - Year 30, Vol 3, Issue 6
Abstract
Coal is an important fossil fuel and is used as a major source of energy in power plants and blast furnaces. But, Indian coals contain a large amount of impurities, particularly ash forming mineral matter, which interfere with proper combustion of coal and decreases its calorific value. Industrial uses demand coal with minimum ash content so that it can be efficiently used in metallurgical, or, power plants. This paper reviews the removal of ash-forming minerals of coal using chemical techniques and also the extraction of coal by the use of various solvents. Solvents, like N-Methyl-2-pyrrolidone (NMP), 1-methyl naphthalene, Dimethylformamide (DMF), Dimethyl sulfoxide (DMSO) can be used to reduce the ash content of coal. However, polar solvents have been proved to extract greater amounts of coal and reduce ash to a greater extent than non-polar solvents, particularly for lower rank, or, subbituminous coals. However, if non-polar solvents are used, then traces of polar additives can also increase the extraction of coal as well as cause greater reduction of the ash content. The degree of ash reduction not only depends on the solvent used, but also on the extraction temperature, time and rank of coal.
Authors and Affiliations
Shashwata Ghosh *
Keywords
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