Washability Study on El-Maghara Coal Mine Reject

Document Type : Original Article

Author

Mining Eng. Dept., Faculty of Petroleum and Mining Engineering, Suez University, Suez 43721, Egypt

Abstract

Egypt is not a coal-rich country; however, El-Maghara coal seams in Sinai (52 million tons with about 27 million tons as minable reserves) is the only coal reserve. Due to the importance of coal as a source of energy, this work deals with an attempt to retrieve escaped coal (gangue) as much as possible using Sink-and-float technique. A bulk sample was collected from the waste dumps of El-Maghara coal mine. The results were characterized by measuring yield recovery and ash contents. Sample was prepared by successive stages of crushing through jaw and roll crushers. Crushed sample was introduced to the screening process using a set of screens (6, 4, 2, 1 and 0.5 mm). Organic liquids such as Bromoform (CHBr3), Carbontetrachloride (CCl4) and Gasoline with specific  gravities of 2.6, 1.59 and 0.721 respectively were used. Several bathes of various specific  gravities (1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9 and 2.0 g/cc) were prepared from organic liquids. The obtained results indicated that, we can achieve about 18.94% clean coal yield recovery with ash content of 2.58%, washing degree of 18.10 and separation efficiency of 95.53% respectively at heavy medium of 1.3 specific  gravity. Also, the obtained results at 1.4 specific gravity were 19.78 % clean coal yield recovery with ash content of 2.61%, washing degree of 18.88 and separation efficiency of 95.47%.

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