Synthesis of mixed ferrite with spinel-type structure from a stainless steelmaking solid waste

Acid recovery plant powder, a solid by-product of the stainless steel indus try with high iron, chromium and nickel content, was used to synthesise a n anocrystalline zinc-chromium-nickel ferrite in order to recover the total m etal content of this waste as a valuable ferric product. Zn2+ was provided by dissolving ZnO in HNO3 and precipitation with 1M n-butylamine solution. The cubic spinel-type ferrite obtained, at temperature as low as 350 degree s C, was characterised by X-ray powder diffraction, scanning and transmissi on electron microscopy. (C) 1998 Elsevier Science S.A. All rights reserved.