Novel Ceramic Pigments Based on Industrial Wastes
We report the preparation of ceramic pigments using industrial wa stes as primary sources. An Al-rich sludge (generated in the wastewater treatment unit of an anodising or surface coating industrial plant), a galvanizing sludge (from the Cr/Ni plating process ), a Fe-rich sludge (generated during steel wiredrawing), a foundry sand and a marble sawing sludge are combined to formulate distinct pigment structures via the solid state reaction method. In particular, a black spinel and a novel blue pigment based on the hibonite structure are detailed. A green olivine, and brown and pink sphenes are also reported. The pigments were fully characterized, and then were tested in a standard transparent bright ceramic glaze. Typical working conditions and colour development are fully described.
Pietro VINCENZINI and Michele DONDI
W. Hajjaji et al., "Novel Ceramic Pigments Based on Industrial Wastes", Advances in Science and Technology, Vol. 68, pp. 194-201, 2010