METHOD OF PRODUCING WOLLASTONITE CERAMIC PIGMENTS BASED ON DICALCIUM SILICATES Russian patent published in 2013 - IPC C04B41/86 

FIELD: chemistry.

SUBSTANCE: method involves fast water cooling of a gel calcined at 1050-1100°C, said gel being obtained by concentrated hydrochloric acid treatment of a mixture of finely ground wastes - dicalcium silicate (nephelene sludge) (63.0-70.4 wt %), silicon oxide (22.0-24.6 wt %) and chromophore (5.0-15.0 wt % with respect to the oxide). Obtained pigments are stable in the 650-850°C temperature range and can be used to produce overglaze paints and low-melting glazes.

EFFECT: obtaining pigments with a brighter colour with low content of chromophores due to more intense embedding of colouring ions into the wollastonite lattice, low production cost of the pigments due to use of production wastes and shorter time spent on firing the pigments.

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