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Chromatic Properties of Industrial Solid Waste Based Ferrites

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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 (Ca5(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 °C and 1,050 °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)2O4 (DCMA 13-40-9), chrome iron nickel (Ni,Fe)(Fe,Cr)2O4 (DCMA 13-50-9), and manganese ferrite (Fe,Mn)(Fe,Mn)2O4 (DCMA 13-41-9).

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Acknowledgments

The work was supported by FCT-CNR joint project 2011–2012 “Ceramic pigments from industrial wastes”.

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Correspondence to W. Hajjaji.

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Hajjaji, W., Pullar, R., Seabra, M.P. et al. Chromatic Properties of Industrial Solid Waste Based Ferrites. Waste Biomass Valor 3, 375–378 (2012). https://doi.org/10.1007/s12649-012-9122-x

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