Abstract
The effectiveness, over a wide pH range, of froth flotation for the removal of trace and major elements from the fines of three coals of different rank was studied with the aim of maximizing the reduction of trace elements to meet future stricter environmental laws. X-ray fluorescence spectrometry and neutron activation analysis were used for the analysis of inorganic elements. As, Cu, Hg, Pb, Se, Mo and Ni, trace elements of environmental concern, as well as Al, Ti, Si, Ba, Cr, U and V were effectively removed from the three coals by flotation. For a given element, the efficacy of its elimination by flotation was both coal- and pH-dependent. Figaredo and Sovilla coals showed greater coal-dependence. The effectiveness of removal from AUM coal depended greatly on the flotation pH.
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