Synthesis of ultramarine pigment from the mudstone of kutingkeng formation and the improvement of its refractory properties

European Chemistry Congress

June 16-18, 2016 Rome, Italy

S L Chen and D T Ray

National Cheng-Kung University, Taiwan

Scientific Tracks Abstracts: Chem Sci J

Abstract :

Ultramarine (Na8-x[SiAlO4]6[S2,S3,SO4Cl.]2-x) is an inorganic nontoxic blue pigment, consists of an aluminosilicate framework, constructed from sodalite cages (�� type). In this study, the mudstone from Kutingkeng Formation exposed in Southern Taiwan was used as the raw material to synthesize ultramarine pigment via a traditional solid state reaction route. The mudstone was first hydraulically classified to collect the <2 �¼m part. The <2 �¼m part was mixed with sodium carbonate, sulfur and active carbon, formed into agglomerates and calcined at 800�°C for 8 hr. The color characteristics of the products were measured by the CIE Lâ��aâ��bâ��system. The best hue, lightness and chroma obtained are 289�°, 30.6 and 66.8, respectively. Due to the poor high temperature stability of the ultramarine, further studies of coating a silica film on the ultramarine particles were performed. The results showed that the coated ultramarine can tolerate temperatures as high as 1000�°C. This may create a new application of ultramarine as a glaze pigment.

Biography :

S L Chen is a PhD student at National Cheng-Kung University, Taiwan.
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