METHOD OF OBTAINING OF CORDIERITE CERAMIC PIGMENT Russian patent published in 2008 - IPC C03C1/04 C04B41/87 

FIELD: chemistry.

SUBSTANCE: invention relates to obtaining heat-resistant ceramic pigments for colouring ceramic masses and glazes, as well as for obtaining under-glaze and over-glaze ceramic paints. Method consists in the following: charge containing mixture of talc, kaolin and technical alumina, providing stehiometric composition of cordierite, is mixed with solution of chromophore in concentration 4.0-15.6 g-ion/100 g of solution according to volume ratio "mineral powder : chromophore solution" 1:1 - 1:4 and boiled for 30-60 minutes. Then sediment is separated from solution, dried and burned at temperature 1100-1200°C. Boiling of charge ensures more equal distribution of colouring salt throughout the volume of mineral powder mixture before synthesis, which facilitates process of embedding of colouring ions into crystalline structure of cordierite during burning and makes it possible to increase brightness of pigments. Obtained pigments have bright-blue, beige, sand, green, red-brown colour.

EFFECT: obtaining cordierite pigments for colouring ceramic masses and glazes, resistant to aggressive impact of melted glaze, high temperatures.

1 ex, 4 tbl