Method for separating and refining scandium

摘要

An object of the present invention is to provide a method for separating and refining scandium capable of efficiently separating and refining the scandium from a solution containing the scandium, with improved stripping, while securing separability (selectivity) of the scandium from impurity elements. The method of the present invention involves mixing a solution containing the scandium with an organic solvent containing a trioctylphosphine oxide to extract the scandium into the organic solvent; and mixing the organic solvent with a stripping starting solution containing any one or more of water, hydrochloric acid, sulfuric acid, and oxalic acid to strip the scandium from the organic solvent.

主权项

1. A method for separating and refining scandium comprising:
an extraction step of mixing an aqueous solution containing scandium with an organic solvent containing a trioctylphosphine oxide to extract the scandium into the organic solvent; a stripping step of mixing the organic solvent with a stripping starting solution containing any one or more of water, hydrochloric acid, sulfuric acid, and oxalic acid to strip the scandium from the organic solvent for producing a post-stripped solution; and a scrubbing step of mixing the organic solvent from which the scandium is extracted in the extraction step with a hydrochloric acid solution having concentration of 2.0 mol/l to 9.0 mol/l, or a sulfuric acid solution having concentration of 3.5 mol/l to 9.0 mol/l to separate impurities.