Designing of technological scheme for conversion of Cr-rich electroplating sludge into the black ceramic pigments of consistent composition, following the principles of circular economy. Issue 1 (February 2021)

• Record Type: Journal Article
• Authors: Matović, Ljiljana; Vujasin, Radojka; Kumrić, Ksenija; Krstić, Sanja; Wu, Yi-nan; Kabtamu, Daniel Manaye; Devečerski, Aleksandar
• Is Part Of: Journal of environmental chemical engineering. Volume 9:Issue 1(2021)
• Publication Date: 2021-02
• Subjects: Electroplating sludge -- Chromium recovery -- Black inorganic pigment -- Nanocomposite -- Circular economy technology; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2021.105038
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: Development of method for the complete conversion of Cr-containing electroplating sludge (ES) into the black inorganic pigment was presented. Difficulties related to the ES complex, variable composition and inhomogeneity, where the dominant presence of Cr was followed by: Fe, P, Zn, Ni, Cu, etc., can be overcome by determination of the precise amount of Fe2 O3 necessary to be added in order to firmly embed all the heavy metals into the pigment structure (i.e. the Fe0.7 Cr1.3 O3 /FePO4 nanocomposite), taking care not only about weight/molar ratios, but also about average particle size, apparent densities, and volume fraction of the starting materials. As a source of Fe2 O3, commercial (p.a.) Fe2 O3 and two different Fe-wastes were used, thus completely fulfilling the principles of the circular economy. The obtained black inorganic pigments have consistent composition, no leaching of toxic metals, color (CIE L*a*b* values) comparable with those of commercial pigments and thus have the potential commercial large scale application. Graphical Abstract: ga1 Highlights: Conversion of Cr-containing electroplating sludge into black inorganic pigment. Consistent composition of pigment was obtained by adding different Fe-wastes. Completely fulfilled principles of the circular economy.