METHOD OF PRODUCING CRYSTALLINE TITANOSILICATE Russian patent published in 2024 - IPC C01B33/20 C01G23/00 

FIELD: chemistry.

SUBSTANCE: invention relates to the technology of titanosilicates having sorption properties and can be used in producing sorbents for purifying uranium-containing technogenic and hydromineral material. Initial powdered frame titanosilicate is obtained by hydrothermal synthesis using as a source of titanium a product of processing sphene concentrate – salt of titanyl sulphate and ammonium with content of aluminium impurities 0.05–0.35 wt.% and titanium 11–13 wt.%. Obtained frame titanosilicate Na₃(Na,H)Ti₂O₂[Si₂O₆]₂⋅2H₂O treated with 0.001–5.0 M solution of nitric or sulphuric acid for 0.1–0.5 hours to obtain crystalline layered titanosilicate Ti₂(OH)₂[Si₄O₁₀(OH)₂](H₂O)₂. Then layered titanosilicate is subjected to modification by treatment with 0.001–5.0 M solution of sodium, potassium and calcium chlorides at pH 6.0–7.4, temperature 25–41 °C for 4–7 days and periodic stirring. Modifying solution may additionally contain magnesium chloride and tris(hydroxymethyl)aminomethane (HOCH₂)₃CNH₂. A titanosilicate solid phase is separated from the formed suspension by vacuum filtration. Solid phase is washed with distilled water at S:L=1:(3–5) and dried at temperature of 35–45 °C to obtain crystalline titanosilicate A_mB_nTi₂Si₄O_12.5(OH)_1.5⋅2H₂O, where A is a sodium or potassium or calcium ion. B is hydrogen ion, m=1–4, n=0.5–1.0.

EFFECT: method enables to obtain crystalline titanosilicates of sodium, potassium and calcium, using which degree of extraction of uranium reaches 99.7 %, which corresponds to design sorption capacity of 464.6 mg/g.

4 cl, 6 ex