METHOD OF EXTRACTING SCANDIUM FROM SCANDIUM-CONTAINING MATERIALS Russian patent published in 2020 - IPC C22B59/00 C22B3/12 C22B3/24 

FIELD: technological processes.

SUBSTANCE: invention relates to technology of extraction and concentration of scandium, and can be used in production of scandium from various types of scandium-containing materials, in particular, red muds of alumina production and wastes formed during processing of titanium-, zirconium-, tungsten-, nickel-, niobium- and tantalum containing raw materials. Method comprises repulping scandium-containing cake with a solution of a mixture of carbonate and sodium bicarbonate, carbonisation leaching of scandium-containing material with a soda-bicarbonate solution in a single step, filtration of leached scandium-containing material, extraction of scandium concentrate. Carbonation leaching of scandium-containing material is carried out with a solution of a mixture of carbonate and sodium bicarbonate with concentration of 130–350 g/dm³ Na₂CO₃ and 2–100 g/dm³ NaHCO₃ at pulp pH of 9.5–11.0 and temperature of 20–90 °C. Required pH value of the pulp is maintained by gasification of the pulp with a gas-air mixture containing CO₂. Extraction of scandium concentrate from leachate is carried out in one stage by means of its treatment with alkali solution.

EFFECT: method increases degree of extraction of scandium, simplifies instrument-technological scheme and eliminates use of sorbents and extraction agents.

10 cl, 1 dwg, 12 tbl, 2 ex