Density fractionation of a high-ash Brazilian sub-bituminous coal -implications for chemical and petrological properties

摘要

In order to improve the combustion characteristics of a high-ash Brazilian coal (Seam Camada Candiota Inferior, Candiota Coalfield), laboratory-scale "sink and float" tests were carried out to reduce the sulfur contents and ash yields. The separation was achieved by applying dense liquids (ethyleneglycol, perchloroethylene and bromoform), with densities varying from 1,3 to 2,4 g/cm~3, and the resulting fractions were analyzed chemically and petrologically.