METHOD FOR OBTAINING OXIDE CHARGE USEFUL FOR PRODUCTION OF COLOUR CORUNDUM CRYSTALS Russian patent published in 2015 - IPC C25B1/00 C01F7/42 C30B29/20 

FIELD: metallurgy.

SUBSTANCE: invention relates to a method for obtaining oxide charge useful for production of colour corundum crystals, which involves anodic dilution of alloy based on aluminium of high purity in a water solution containing cations $$N{H}_4^{+},$$ Na+ or their mixtures, separation of a hydroxyl deposit, its washing and roasting. Colouring agents of different metals are added to aluminium of high purity at the temperature of 670-1050°C.

EFFECT: invention allows obtaining oxide charge of high purity, which is useful for growth of colour corundum crystals, with high jewellery properties, which have uniform colour of the surface and have no external defects.

8 cl, 1 ex, 1 tbl