METHOD OF RECYCLING SCANDIUM-CONTAINING SOLUTION OF URANIUM PRODUCTION Russian patent published in 2024 - IPC C22B59/00 C22B3/08 C22B3/20 C22B3/24 

FIELD: chemistry; various technological processes.

SUBSTANCE: invention relates to extraction of scandium from technogenic and productive scandium-containing solutions formed during extraction of uranium. Method involves extraction of scandium on a solid extractant (SE), re-extraction of scandium, return of the re-extracted SE for extraction of scandium, precipitation of thorium fluoride from the scandium re-extraction solution, precipitation of the scandium fluoride concentrate with a calcium compound from the deactivated scandium re-extraction solution to obtain a filtrate which is saturated with hydrofluoric acid and re-directed for the scandium re-extraction and the scandium fluoride concentrate, which is treated with obtaining sparingly soluble scandium compound. Scandium fluoride concentrate is treated with concentrated sulphuric acid to obtain off-gases and sinter, from which a sparingly soluble scandium compound is subsequently deposited or directed directly to obtain scandium oxide and an insoluble residue. Residue is treated with a solution of sodium hydroxide or sodium carbonate to obtain a suspension of an insoluble residue. Suspension is filtered, and the obtained precipitate is repeatedly sent for precipitation of a concentrate of scandium fluoride with a calcium compound from a deactivated solution of scandium re-extraction. Waste acid gases are passed through filtrate. Before passing off acid gases and saturation with hydrofluoric acid, the filtrate contacts the anionite to extract rare metals to obtain a saturated anionite. Anionite is desorbed with a solution of an alkali metal or ammonium carbonate to obtain anionite, which is repeatedly sent for extraction of rare metals from the filtrate and a desorption solution saturated with rare metals, which is sent to obtain a concentrate of rare metals.

EFFECT: method makes it possible to increase through degree of extraction of scandium.

1 cl, 9 dwg, 9 ex