Turquoise ceramic pigment free of cobalt, vanadium and zirconium containing chromium/nickel plating sludge

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Patent Details

Publication Number
PT103540
Priority Date
2006-07-26
Publication Date
2008-01-31
International Patent Classification
C04B18/14

Figures

figura
Application tests (10 wt%) of the T1-Ni (center) and sludge-based (right) pigments on stoneware paste (on the left).

Abstract

The present invention relates to the synthesis, by solid state reaction, of a turquoise ceramic pigment, free of cobalt, vanadium and zirconium. This pigment comprises calcium oxide, silica, alumina, tin oxide and nickel oxide, being this the chromophore component.
One of the formulations uses sludge from wastewater treatment plants of surface treatment industries (coating with chromium and nickel), to introduce the chromophore element, replacing the commercial nickel oxide. This hazardous waste can be introduced as it is received, but can also be prior dried or calcined.
Pigment processing steps are: raw materials dosing and homogenization; mixture calcination; washing and crushing. In accordance with the invention, blue colored ceramic pigments are obtained, which are thermostable, insoluble in glassy matrix and do not change the physical properties of the matrix, providing coloring to ceramic products.

Innovative aspects & main advantages

The present invention concerns to the synthesis, by solid state reaction of a turquoise ceramic pigment, free of cobalt, vanadium and zirconium. This pigment contains calcium oxide, silica, alumina, tin oxide and nickel oxide, where the latter is the chromophore component. The formulations use the sludge generated from wastewater treatment plants (of potable water, combined with the) sludge generated from metal plating (chromium and nickel) processes. The last one introduces the chromophore element, replacing pure/commercial nickel oxide.
In accordance with the work it is possible to obtain blue colored ceramic pigments complying with all required properties to be used as colorant of ceramic products and glasses.

Applications

The main application of this invention (the potential commercial/industrial sectors) is focused on the pigments producers, while the colorants might be applied in distinct products, such as ceramics, glazes and glasses.

Inventors

Batista, João; Ribeiro, Manuel; Costa, Maria; Trindade, Tito;

Our Inventors

foto João António Labrincha Baptista

João António Labrincha Baptista

Full professor
no photo

Manuel Joaquim Peixoto Marques Ribeiro

foto Tito Trindade

Tito Trindade

Full professor

Applicant

Universidade de Aveiro

Groups Involved

G1 - Porous Materials and Nanosystems
G4 - Renewable Materials and Circular Economy

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