Washability Study using Float-Sink Test Method of Coal from Paludda, Barru Regency, South Sulawesi, Indonesia

Abstract

Abstract South Sulawesi’s coal quality is still relatively low so that its utilization is still limited, such as for fuel in cement factories and some other local industries. One of the locations for coal deposits in South Sulawesi is in the Paludda area, Pujananting District, Barru Regency. To increase the economic value of low-grade coal, special treatment is needed in the form of beneficiation before the coal is used, one of which is the Float-Sink Test method to separate clean coal from impurities. Coal samples that have been taken from the outcrop are then comminuted to produce a size of 1 to 5 mm. Coal washing was carried out using a mixed heavy liquid of perchloroethylene (1.62 g/cm 3 ) and wash benzene (0.68 g/cm 3 ) and produced a heavy liquid fraction ranging from 1.2 to 1.6 g/cm 3 . Results based on the washing yield curve, if an ash content below 4% is required, clean coal can be obtained at a fraction of 1.45 g/cm 3 with a net coal recovery of up to 94%.

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