METHOD FOR OBTAINING MODIFIED TITANOSILICATE OF PHARMACOSIDERITE TYPE Russian patent published in 2017 - IPC C01G23/00 C01B33/32 C30B29/34 B01J20/10 B01J20/02 B01J20/30 

FIELD: chemistry.

SUBSTANCE: chloride titanium-containing reagent is used in the form of titanium tetrachloride or a mixture of titanium tetrachloride and hydrogen peroxide solution in a molar ratio of 1:(8-16) and added to the silicon-containing reagent as a collective solution of sodium silicate and sodium and potassium hydroxides. The content of the components in the resulting suspension should satisfy the molar ratio TiO₂:SiO₂:Na₂O:K₂O:H₂O=l:(4,3-6):(6,4-8,7):(0,8-1):(195-700). The suspension is kept in sealed conditions at a temperature of 160-180°C for 8-20 hours to form a solid phase in the form of pharmacosiderite type titanosilicate. The solid phase is separated from the mother liquor, washed with distilled water and dried. Then, the titanosilicate is modified by treatment with a solution containing hydrazine at a concentration of 0.50-1.14 g/l at T:G=1:(100-400) for 0.3-2 hours. The modified titanosilicate is separated, washed with distilled water and dried. The extraction of noble metals in mg per g of the modified product is: gold 260-275, platinum 110-134, palladium 119-141.

EFFECT: method allows to obtain a monophasic hydrazinium-modified titanosilicate of the pharmacosiderite type, which has a high sorption ability with respect to noble metals.

5 cl, 5 ex