METHOD OF PRODUCTION OF ULTRAMARINE CERAMIC PIGMENT Russian patent published in 2007 - IPC C03C1/04 

FIELD: production of inorganic ceramic pigments.

SUBSTANCE: charge contains cobalt oxide (III), aluminum oxide, powder-like aluminum and additionally zinc oxide at the following ratio of components, mass-%: cobalt oxide CO₂O₃, 43-46; aluminum oxide Al₂O₃, 44-48; aluminum Al, 7-10; zinc oxide ZnO, 2-5. Charge of such composition is thoroughly mixed and is poured into screen made from stainless steel. Then, charge is heated to temperature of 500C for obtaining layer-by-layer burning effected from incendiary tablet Ni+Al (50 at.% Al) initiated by electric igniter. Thermosynthesis of pigment is carried out under conditions of layer-by-layer burning and natural filtration ensuring easy removal of gases formed in the course of synthesis.

EFFECT: enhanced efficiency; improved pigment color characteristics.

2 cl, 1 dwg, 2 tbl