Potential of Metal Recovery from Coal Combustion Products. Part I. Physicochemical Characterization

Abstract

The paper presents physicochemical characteristic of coal combustion products: fly ashes from three stages of electrostatic dust collecting system (FA I , FA II , FA III ), slag (S) and slurry from wet flue gas desulphurization (S-wFGD). Fly ashes are classified as ‘siliceous’ or ‘sialic-high acid’. The concentrations of selected heavy metals indicate that their values increase in accordance with consecutive stages of dust collecting system. Fly ash FA III and slurry from wet FGD have the largest heavy metals content. The results show the increment of lanthanides and ittrium (REY) contents in CCPs from slag, through FA II and FA I to S-wFGD and FA III .