resumo
The use of red mud (RM) and Cr/Ni electroplating sludge (ES), two hazardous industrial wastes, was studied as possible coloring agents for commercial glazes: transparent (TR), bright white (BR) and matte (MT). The influence that a heat treatment produced on the color development/stability was analyzed by comparing, separately, RM and ES non-calcined and calcined at 1200 degrees C. RM and ES yielded glazes with red/brown and grey/green hues, respectively. The calcination enhanced the powders coloring strength. ES (non-calcined and calcined) provides a fairly stable coloration when added to BR and MT, and RM (non-calcined and calcined) when added to TP and BR, upon firing at 1100 +/- 15 degrees C. So, depending on the type of glaze, when using RM and ES as coloring agents their previous heat treatment can be avoid leading to meaningful environmental and economic benefits. (C) 2018 Elsevier B.V. All rights reserved.
palavras-chave
PIGMENTS
categoria
Materials Science; Physics
autores
Carneiro, J; Capela, MN; Tobaldi, DM; Novais, RM; Seabra, MP; Labrincha, JA
nossos autores
David Maria Tobaldi
Investigador
João António Labrincha Baptista
Professor Catedrático
Jorge Augusto Oliveira Carneiro
Bolseiro de pós-Doutoramento
Maria Paula Seabra
Professor Auxiliar
Marinélia Capela
Investigador
Rui Miguel Novais
Professor Auxiliaragradecimentos
This work was developed within the scope of the project CICECO-Aveiro Institute of Materials, POCI-01-0145-FEDER-007679 (FCT Ref. UID/CTM/50011/2013), financed by national funds through the FCT/MEC and when appropriate co-financed by FEDER under the PT2020 Partnership Agreement.