METHOD OF PRODUCING OF SCANDIUM CONCENTRATE FROM RED SLIME Russian patent published in 2015 - IPC C22B59/00 C22B3/12 C22B3/20 C01F17/00 

FIELD: metallurgy.

SUBSTANCE: method includes repeated consecutive leaching of red slime by carbonate solution at passing through the air-gas mix pulp containing CO₂. Then slime separation and washing, and scandium extraction from the obtained solution are performed. The leaching is performed at passing through the slurry pulp of the air-gas mix containing CO₂ at the pressure 3.0-6.0 bar in the vibrocavitational mode with subsequent two-phase conditioning of productive solution at increased temperatures. At the first stage - at the temperature no less than 90°C and pH value 9.0-9.5 within 3 hours with further filtration of the formed low soluble compounds of impurity components, at the second stage - at the temperature 100-110°C within 3 hours with adding of sodium hydroxide solution up to pH≥12.5, and scandium concentrate is settled.

EFFECT: increase of level of extraction of scandium and increase of yield of the target product.

4 cl, 3 tbl, 4 ex