Evaluation of metal-ions containing sludges in the preparation of black inorganic pigments
authors Hajjaji, W; Seabra, MP; Labrincha, JA
nationality International
journal JOURNAL OF HAZARDOUS MATERIALS
author keywords Waste valorization; Pigments; Spinel; Nichromite; Trevorite
keywords MAGNETIC-PROPERTIES; SPINEL; WASTE
abstract Inorganic pigments were prepared from industrial wastes: galvanizing sludges resulting from Cr/Ni plating processes (S. G, and T) and a sludge generated from steel wiredraw process that is Fe-rich (F). These industrial wastes were characterized in order to determine the main compositional variations and discover their influence on the colour characteristics of pigments for glazes and ceramics. The toxic character was also investigated and established. Attempting to form the black spinel structure, several combinations of sludges were prepared and then calcined at 1000 degrees C. XRD and microscopy analysis confirmed the presence of nichromite for compositions with higher Ni amounts, while trevorite was detected in iron-rich formulations. The combination of S and F sludges (SF compositions) generates pigments with higher black colorimetric quality, which is similar to, and sometimes better than, a commercial black pigment. Pigments containing GF and TF sludges develop brown hues on glazes and on porcelain stoneware bodies, being this effect more evident upon industrial firing trials. The addition of minor amounts of cobalt or manganese enhances the black coloration, and might adjust some formulation deviations. (C) 2010 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0304-3894
year published 2011
volume 185
issue 2-3
beginning page 619
ending page 625
digital object identifier (doi) 10.1016/j.jhazmat.2010.09.063
web of science category Engineering, Environmental; Engineering, Civil; Environmental Sciences
subject category Engineering; Environmental Sciences & Ecology
unique article identifier WOS:000286782600007
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