Extraction of iron from vanadium slag using pressure acid leaching

The extraction of iron from vanadium slag was attempted using pressure acid leaching. The effects of the several parameters which included reaction time, H+/slag ratio, leaching temperature, and concentration of additive (Na2S) upon leaching efficiency of iron were investigated. The results showed that the leaching efficiency of iron could reach above 76% in the best leaching condition. By using Leaching solution as iron source, Fe2O3 hollow spheres have been successfully synthesized via facile hydrothermal method by using carbon spheres as template followed by a subsequent heat treatment. The experimental results show that hollow spheres structures of Fe2O3 with the mean particle size of 0.9-1.2 mu m is single hexagonal crystal system. (C) 2016 The Authors. Published by Elsevier B.V.