RU2001105366A - METHOD FOR SCANDIUM EXTRACTION WHEN PROCESSING BOXITE ON ALUMINUM - Google Patents

Claims (1)

A method for extracting scandium during processing of bauxite into alumina, including leaching the initial product, extracting and concentrating scandium from the solution, followed by separation of the solution from the precipitate, introducing into the resulting solution a solution containing amphoteric metal of the collector, subsequent filtering of the precipitate, washing, drying and calcining , characterized in that the leaching with water and / or a 5-12% solution of carbonate or sodium bicarbonate, or a mixture thereof, is carried out at least 3 times at a temperature not exceeding 50 ^o C for e not less than 2 hours at a ratio of T: L = 1: 2.5 ÷ 5.0 using each time new portions of the bauxite processing product as a feedstock; as a solution containing amphoteric metal collector hydroxide, a solution of aluminum oxide or zinc in sodium hydroxide is used, after the solution of aluminum oxide or zinc oxide in sodium hydroxide is introduced, the solution is kept at a temperature of at least 80 ^{° C.} for at least 2 hours, the precipitate is separated washed and treated with a 10-25% sodium hydroxide solution while heating to a boil, filtered and washed with a 1-5% sodium hydroxide solution, then the precipitate was dissolved in 1-5% hydrochloric acid, filtered and the filtrate was treated with 10- 25% ammonia solution or 2-10% strength hydrofluoric acid with an excess of 1-3% from stoichiometry.