METHOD FOR PRODUCING SCANDIUM OXIDE FROM SCANDIUM CONCENTRATE Russian patent published in 2017 - IPC C01F17/00 

FIELD: metallurgy.

SUBSTANCE: method of producing scandium oxide comprises dissolving of the scandium concentrate in sulfuric acid to obtain a pregnant solution, extraction of zirconium ions from the pregnant solution is carried out using the anion exchanger, containing primary amino groups, extraction of scandium ions from the pregnant solution at extragentconsisting of a mixture of Di2EGFK and TBP with ratio of Di2EGFK:TBP=1:3.1, washing of the saturated extragent with sulfuric acid and hydrogen peroxide solution, re-extraction of scandium with alkaline agent, a mixture of sodium hydroxide and sodium carbonate is used as the alkaline agent with a ratio of NaOH:Na₂CO₃=1:1-5, to obtain a scandium precipitate and re-extraction mother liquid, where the re-extraction mother liquid is resaturated with the alkaline agent and resent to re-extraction, and the scandium precipitate is redissolved in the acid with deposition of scandium oxalate, which is calcinated to scandium oxide.

EFFECT: obtaining a purer scandium oxide with increased degree of its extraction.

1 dwg, 4 tbl, 4 ex