Use of industrial wastes in the formulation of olivine green pigments

This work describes the formulation and synthesis of Ni-olivine green pigments from industrial wastes, namely foundry sand and a sludge resulting from the wastewater treatment of the Ni/Cr galvanising process. This second one is considered as hazardous waste since the leached levels of nickel and ch...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2010-11, Vol.30 (15), p.3079-3085
Main Authors: Esteves, D., Hajjaji, W., Seabra, M.P., Labrincha, J.A.
Format: Article
Language:English
Subjects:
Ceramics
Chromium
Formulations
Foundry sand
Galvanising waste
Green pigments
Hazardous wastes
Industrial wastes
Ni-olivine
Nickel
Phases
Pigments
Wastes
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Summary:This work describes the formulation and synthesis of Ni-olivine green pigments from industrial wastes, namely foundry sand and a sludge resulting from the wastewater treatment of the Ni/Cr galvanising process. This second one is considered as hazardous waste since the leached levels of nickel and chromium are above legal concentrations. Pigments were prepared by the solid state reaction method and Ni 2SiO 4 is formed at only 1050 °C. SiO 2 (in excess) and NiCr 2O 4 are present as secondary phases. By using pure reagents and following similar processing conditions, the Ni-olivine phase is only observed at 1200 °C. The green colour of the pigments is due to spin-allowed transitions of Ni 2+ in octahedral M1 and M2 positions. The sample prepared from wastes shows a stronger and darker green hue. The colouring performance of ceramic glazes and bodies is also optimal, confirming the potential of the use of such wastes for ceramic pigments production.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2010.07.006