Examination of the Ability of Electromagnetic and Electrostatic (Corona) Separation for Humic Acids Beneficiation of Lignite from Stanyantsy Mine

Abstract

Different methods of coal separation and beneficiation create conditions for increasing the content of extractable humic acids from coal. Usage of electromagnetic separation leads to reduction of total sulfur content below 1%. A tendency for increasing the content of humic acids in the non-magnetic fraction is observed. The results of the electrostatic corona separation show that as the yield of conductive fractions is increased, the total sulfur content in the material and the extractable humic acids decreased. As the yield of the dielectric fraction is increased, the proportion of humic substances in this class is increased as well. As the sulfur content in the conductive fraction is increased, the humic acids proportion in the non-conductive fraction gets higher. The increasing of extractable humic acids reaches 24%.