The effect of milling and percentage dissociation of plasma dissociated zircon on the colour of Pr-yellow and V-blue zircon pigments |
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| Affiliation: | 1. Department of Chemical and Metallurgical Engineering, Tshwane University of Technology, Private Bag X680, PRETORIA 0001, South Africa;2. School of Process and Materials Engineering, University of the Witwatersrand, Private Bag X3, Wits, 2050, South Africa;3. South African Nuclear Energy Corporation Limited, PO Box 582, PRETORIA 0001, South Africa;1. College of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China;2. Foshan Oceano Ceramics Co. Ltd., Foshan 528138, China |
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| Abstract: | The effect of milling and percentage dissociation of plasma dissociated zircon (PDZ) on the colour of Pr-yellow and V-blue zircon pigments were investigated. A solid-state reaction process was used to produce zircon pigments and the Pr-yellow and V-blue pigments were calcined at 1050 and 950 °C, respectively in a conventional muffle furnace. Using pre-milled PDZ material, prior to the calcining process, the influence on the colour intensity of the pigments after application on a ceramic tile were compared to that of a PDZ material with no prior pre-milling before the calcination stage. Pr-yellow and V-blue zircon pigments produced from PDZ with different percentages dissociation, were also evaluated in this study. The different percentages dissociation of the PDZ material was achieved by only changing the zircon feed rate through a non-transfer arc plasma system, keeping all the other plasma parameters constant.The colour of the pigment samples was characterized on the grounds of the Commission Internationale de l’Eclairage (CIE) standard procedure (CIE L* a* b* measurements) after application on a bisque ceramic tile. |
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