Fa. Lopez et al., SYNTHESIS OF NANOCRYSTALLINE ZINC FERRITE POWDERS FROM SULFURIC PICKLING WASTE-WATER, Journal of alloys and compounds, 265(1-2), 1998, pp. 291-296
A low temperature method was used to synthesise nanocrystalline zinc f
errite powders from sulphuric pickling water (SPW), a waste product of
the steelmaking industry. The synthesis method consisted of coprecipi
tation of a bi-ionic Fe3+/Zn2+ solution with 1M n-butylamine. Fe3+ fro
m the SPW and Zn2+ provided by ZnO were mixed at a molar ratio of 2.0.
The precursor obtained in this manner showed a 2-line X-ray diffracti
on pattern similar to that of ferrihydrite. Thermal treatment of the p
recursor at similar to 375 degrees C led to the formation of pure, fin
e-particle and stoichiometric ZnFe2O4 powders. This process allows the
total recovery of the iron in the SPW, as a product of added value. T
he fine powders were characterised by XRD, FTIR, TG/DSC and SEM. The B
ET specific surface and the magnetic properties of the powders were al
so determined. (C) 1998 Elsevier Science S.A.