Comparison of methods to obtain ash from coal of the Southwest of Colombia

摘要

Themethod for concentration ofmineral matter at low temperature (about 250 ?C), called Low Temperature Ash (LTA) was applied to a sample of coal from the mine "Las Mercedes" located in Colombia southwestern. This method provides better information about the content ofmineral matter in natural coal (NC), removing the organic matter more efficiently without significant transformations of mineral phases present in that coal. These results were observed through M?ssbauer spectra and X-ray patterns taken from samples of NC, (LTA) and the conventional method of High Temperature Ash (HTA). The results show that the LTA process provides more representative data of the mineral phases for natural coal than that using the conventional HTA process.