Síntesis de pigmentos del tipo azul ultramarino utilizando diversos tipos de materia prima

the main goal of this study was to synthesize blue ultramarine-type inorganic pigments by using several raw materials. during the synthesis we used a national and spanish kaolin, a national pirophilite, elemental sulphur, sodium carbonate and carbon. previously, clays were dehydrated at 700°c for 6, 12 and 24 h, and then they were characterized by edx analysis, ft-ir and powder-ray x diffraction. after that, pigments were synthesized by using variable s8/na2co3 ratio and different reaction times. these solids were also characterized by ft-ir, powder x-ray and epr. the clay used was a key factor in the synthesis of sodalite-type zeolite due to the fact that a high si/al ratio does not allow the formation of the sodalite. the best conditions to synthesize blue ultramarine were a s8/na2co3 = 0.3 ratio and a 24 h dehydration time for the raw material