Malayaite ceramic pigments prepared with galvanic sludge


The synthesis and characterisation of chrome-tin red malayaite Ca(Cr,Sn)SiO5 pigments are reported. The novel approach of using a galvanizing sludge from the Cr/Ni plating process as colouring agent is investigated. The ceramic pigments were prepared using a common, solid state reaction process, with optimisation of milling and firing conditions. Characterisation was undertaken using X-ray powder diffraction, diffuse reflectance spectroscopy and application in standard ceramic glazes. The ceramic pigments were of high purity (>= 96% malayaite) and developed a burgundy colour due to the occurrence of Cr4+ and Cr3+ and also Ni2+ in the sludge-bearing samples. The hue of the pigments agreed with standard expectations and optimal formulations showed better performance than some commercial pigments, perhaps due to the contribution of nickel. (c) 2007 Elsevier Ltd. All rights reserved.



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Chemistry; Engineering; Materials Science


Costa, G; Ribeiro, MJ; Labrincha, JA; Dondi, M; Matteucci, F; Cruciani, G

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