Study of Extraction of Rare Earth Elements from Hard Coal Fly Ash

Rare earth elements (REEs) extraction from wastes and/or by-products is alternative possibility of their winning. The occurrence ofREEs, namely 50.1 ppm La, 100.1 Ce and 44.3 Nd was confirmed in solid fly ash samples the coal fired heatingplant (TEKO, Inc. Košice, eastern Slovakia). submitted contribution presents laboratory results REEs leaching ashusing 3M HCl, HNO3, H2SO4 H3PO4 at 80°C during 120 min.It found, that recoveries 65.5% 64.4% 64.3% into liquor may be attained after grain size reduction to below5 μm.