Recovery of vanadium, nickel and molybdenum from fly ash of heavy oil-fired electrical power station

Abstract

After some preliminary tests, two leaching stages of fly ash to recover vanadium, molybdenum and nickel were selected. A first stage was an alkaline leaching of fly ash to recover vanadium and molybdenum followed by a second stage using sulfuric acid leaching of the residual ash to recover nickel. The impact of some operational parameters (liquid/solid, leaching temperature, mixing time, and agent leaching concentrations) on the recovery of V, Ni was investigated. Conditions of precipitation of V and Mo from alkaline medium and Ni from sulfuric acid solution were established.