More intensive preparation/beneficiation of R.O.M coals is being practiced worldwide to meet the severe quality requirements of the market in terms of an environmentally acceptable use of coal amidst the changing properties/fluctuations of R.O.M coals. The intensity of mechanization of coalmines has resulted in the generation of poorer grade fines in substantial quantities. In view of this coal washeries worldwide are installing fine coal treatment facilities, especially froth flotation, column flotation etc. The advances in fine coal recovery process such as froth flotation, column flotation have demonstrated tremendous potential for recovering fine clean coal from what has been earlier discarded as waste. The major limitations of widespread utilization of these technologies are the lack of cost effective dewatering technologies. Filtration and dewatering are key stages in the process of solid liquid separation, aimed mainly at generating saleable products with low moisture levels, recovering water for recycling or making wastes easier to handle and transport for disposal or utilization. In coal industry, dewatering of fine coal & tailings has been a long-standing problem. The present paper highlights some of the various dewatering techniques being practiced worldwide vis-a-vis its application in Indian Coal Preparation industry.
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