Recycling of solid wastes in the synthesis of Co-bearing calcium hexaluminate pigment

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• 作者：W. Hajjaji ; M.P. Seabra ; J.A. Labrincha
• 关键词：Calcium hexaluminate ; Cobalt ; Blue pigment ; Wastes
• 刊名：Dyes and Pigments
• 出版年：2009
• 出版时间：December 2009
• 年：2009
• 卷：83
• 期：3
• 页码：385-390
• 全文大小：399 K

文摘

Cobalt doped calcium hexaluminate was firstly synthesized using pure reagents; subsequently, the pure reagents were substituted with industrial wastes, the composition of which had been characterized using X-Ray diffraction and X-Ray fluorescence namely, Al-anodising sludge replaced pure aluminium whilst marble cutting rejects and foundry sand were employed as sources of calcite and silica, respectively. As expected, cobalt doped hibonite was the major phase present in calcined powders and displayed an intense blue coloration due to the incorporation of cobalt in tetrahedral positions, as confirmed by transitions from ⁴A₂(F) to the excited ⁴T₁(F) and ⁴T₁(P) states observed from UV–Vis–NIR absorption spectra. The novel waste-derived hibonite pigment showed strong and stable colouring potential when applied in different ceramic supports.