METHOD OF PRODUCING Zn ISOTOPE IMPOVERISHED ZINC OXIDE, PURIFIED FROM TIN AND SILICON IMPURITIES Russian patent published in 2012 - IPC C01G9/02 

FIELD: chemistry.

SUBSTANCE: invention relates to the technique of producing Zn⁶⁴ isotope impoverished zinc oxide, purified from tin and silicon impurities, which is currently used as an additive in water coolant of the primary loop of nuclear reactors. Zn⁶⁴ impoverished zinc oxide powder is obtained from Zn⁶⁴ impoverished diethylzinc, dissolved in aqueous acetic acid solution with weight ratio of reactants zinc oxide: water: acetic acid equal to 1:(1.6-2.0):(1.8-2.2). The obtained solution is evaporated to oversaturation - formation of a dense crust of zinc acetate, gradually cooled to 25-30°C and then held for 15-20 hours. The zinc acetate crystalline hydrate precipitated from the solution is filtered and undergoes thermal decomposition in air to zinc oxide at 600-800°C for 4-6 hours.

EFFECT: invention reduces content of tin and silicon in the commercial product to less than 10^-3 % and cuts the number of process steps.

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