METHOD OF PRODUCING WEAKLY AGGREGATED DISPERSED ZIRCONIUM DIOXIDE POWDER Russian patent published in 2024 - IPC B22F9/24 C01G25/02 B01J21/06 

FIELD: inorganic chemistry.

SUBSTANCE: invention relates to inorganic chemistry, particularly to synthesis of weakly aggregated dispersed zirconium dioxide powder. Method involves preparation of an aqueous solution of zirconium oxynitrate or oxychloride. Then, basic zirconium sulphate is obtained by adding sulfuric acid or ammonium sulphate to the obtained aqueous solution and then heating the mixture at temperature of 60 to 90 °C, wherein molar ratio SO₄^2-/Zr⁴⁺ ranges from 0.4 to 0.6. Further, zirconium hydroxide is precipitated with an aqueous solution of ammonia by mixing basic zirconium sulphate and aqueous ammonia solution in a reactor while maintaining a constant pH value in the reaction volume at level of 7 units up to 9 units. Further, the precipitate is washed to concentration of impurity salts of not more than 0.01 mol/dm³, the precipitate is separated, dried, annealed at temperature of 900 to 1,150 °C.

EFFECT: obtaining weakly aggregated dispersed zirconium dioxide powder with size D50 less than 1 mcm.

1 cl, 2 dwg, 6 ex