METHOD OF EXTRACTING SCANDIUM AND RARE-EARTH ELEMENTS FROM RED MUD

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FIELD : chemistry. SUBSTANCE : invention relates to extraction of scandium and rare-earth elements from red mud. Repulping of red mud is carried out at pH = 0.5-1. Pulp is subjected to mechanical activation, sorption leaching of scandium is carried out with an organic sorbent, whose pores are impregnated with a phosphoric ester. Sorbent before desorption is treated with a mixture of solutions of hydrofluoric acid and sulphuric acid. Scandium is desorbed with a suspension of calcium fluoride and hydrofluoric acid to produce scandium concentrate and a mother solution, which is post-saturated on hydrofluoric acid and calcium fluoride and returned to desorption of scandium. Sorption leaching of scandium-depleted pulp of rare-earth elements is performed with a cationite with a macroporous structure, containing sulphonic acid functional groups. Before desorption cationite is treated with sulphuric acid solution. Desorption of cationite is performed with ammonium sulphate solution, and concentrate of rare-earth elements is deposited with a saturated solution carbonate salt with similar cation. EFFECT : high degree of extraction of scandium and rare-earth elements into end product with reduced costs for implementation of method. 7 cl, 1 dwg, 5 tbl, 5 ex