WASTE RECOVERY METHOD FOR CADMIUM TUNGSTATE PRODUCTION Russian patent published in 2022 - IPC C09K11/01 C09K11/54 C09K11/68 C30B29/32 C30B15/00 C01G11/00 C01G41/00 

FIELD: inorganic chemistry.

SUBSTANCE: invention relates to inorganic chemistry, namely to the recovery of waste products from the production of cadmium tungstate for growing CdWO₄ crystals, which is a promising material for use in spectroscopic and radiometric equipment, computed tomography and scintillation bolometers. The method for waste recovery from the production of cadmium tungstate CdWO₄ consists in first mixing cadmium oxide with tungsten trioxide in a stoichiometric ratio of 1.13-1.15, heating the resulting mixture to a temperature of 1000°C in air to obtain a material of superstoichiometric composition Cd_zWO₄ (z=1.13-1.15), and then it is fused with production wastes of the composition Cd_xWO₄ (x=0.95-0.97) removed from the crucible after crystal growth, followed by three-fold recrystallization of the melt by the Czochralski method to obtain crystals of the stoichiometric composition CdWO₄.

EFFECT: invention provides the possibility of waste-free industrial growth of CdWO₄ crystals with minimal losses for the processing of the residual melt.

1 cl, 5 ex, 2 dwg