Chromatic Properties of Industrial Solid Waste Based Ferrites

abstract

The hexaferrite and monoferrite powders were prepared by the common solid state reaction method. Similar formulations have been prepared but using chemically-pure commercial reagents or by using a sludge generated by steel wiredraw process as source of iron oxide. This iron-rich industrial waste is mainly composed of Fe2O3 (62 wt%). Zinc and calcium are present in minor quantities and can form complexes such as franklinite (ZnFe2O4) and apatite (Ca-5(PO4)(3)(OH, F, Cl)). Ni/Cr galvanising sludge was also used to enhance the black coloration of monoferrite. After calcination of the mixtures at 1,000 degrees C and 1,050 degrees C, typical X-ray diffraction patterns of the expected SrFe12O19 and NiFe2O4 phases were obtained, together with minor peaks of spinel-type (SrFe2O4 and ZnFe2O4) and Fe2O3 phases. Anyway, this resulted in a black pigment with chromatic properties comparable to those of commercial formulations, such as iron cobalt chromite (Fe,Co)(Fe,Cr)(2)O-4 (DCMA 13-40-9), chrome iron nickel (Ni,Fe)(Fe,Cr)(2)O-4 (DCMA 13-50-9), and manganese ferrite (Fe,Mn)(Fe,Mn)(2)O-4 (DCMA 13-41-9).

subject category

Environmental Sciences & Ecology

authors

Hajjaji, W; Pullar, R; Seabra, MP; Labrincha, JA

our authors

acknowledgements

The work was supported by FCT-CNR joint project 2011-2012

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