MIXTURE FOR PRODUCING BLUE-COLOURED UNFITTED GLAZE Russian patent published in 2012 - IPC C04B41/86 

FIELD: chemistry.

SUBSTANCE: invention relates to the technology of producing ceramics and glaze compositions for applying on porcelain, faience and semiporcelain articles. The mixture for producing blue-coloured unfritted glaze contains the following components, wt %: annealed vanadium catalyst wastes (sulphovanadate on diatomite) 23-25, nepheline sludge 23-25, feldspar 50 and cobalt oxide CoO₂. To obtain glaze slurry, components of the mixture are mixed and subjected to wet mixed grinding to sieve No.0056 residue of not more than 0.2%. The glaze has the following properties: TCLE 76.97·10^-7 deg^-1, density 2659 kg/m³, refraction index 1.502, flow temperature interval 1200-1230°C.

EFFECT: high flow temperature of the glaze and low cost of production of the glaze by excluding the fritting step and using cheap raw material.

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