METHOD FOR PRODUCTION OF AMMONIUM ALUM-BASED PIGMENTS Russian patent published in 2006 - IPC C03C1/04 C09C1/00 

FIELD: ceramic industry, in particular production of heat resistant pigments for decoration of faience and porcelain ware.

SUBSTANCE: claimed method includes application of ammonium alum Al₂(SO₄)₃(NH₄)₂SO₄.24H₂O and transition metal Ti, V, Cr, Mn, Fe, Co, Ni salts or salts of metals with chromophore properties (e.g., lanthanides) as starting components. Mixture containing dehydrated ammonium alum and one dissoluble chromophore metal salt is placed in corundum crucible, heated to 200°C and hold at the said temperature for 120 min to release crystalline water from alum. Then solution is heated and boiled, metals is decomposed to pure oxides and conditioned at 800°C for 60 min. After that product is heated up to final synthesis temperature, namely o 1250-1500°C and hold at this temperature for 60-90 min.

EFFECT: pigments of improved purity; simplified and economical method with increased yield.

1 cl, 1 ex, 2 dwg