Effect of Using Nano-Kaolin on Synthesis Time of Ultramarine Pigment

Previous research work by present authors showed that the synthesis time of ultramarine pigments is high, which leads to the consumption of high energy. Therefore, decision has been taken to replace nano-kaolin for kaolin in the production of blue ultramarine pigments. The traditional method, consisting of firing mixture of nanokaolin,sulfur, carbonate sodium and resin under controlled atmosphere has been used for synthesis of pigments.Pigments were characterized by XRD, UV-Visible and colorimetery. As shown by XRD results, using nano-kaolin compared to kaolin enhanced the formation of blue ultramarine phase, and lead to the elimination of minor phases. Also using nano-kaolin significantly reduced the synthesis time.

Keywords:

nanokaolin , blue ultramarine , synthesis time