Method for separating and refining scandium
AssigneeSumitomo Metal Mining Co., Ltd.
InventorSatoshi Asano
Life of this patent
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Abstract
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.
Claims6
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.
A production method for scandium oxide comprising:
- 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;
- after the stripping step, a crystallization step of adding oxalic acid to the post-stripped solution to produce a crystal of scandium oxalate;
- and
- a pyrolysis step of heating and pyrolyzing the produced scandium oxalate to produce scandium oxide.
Dependencies are inferred from the claim text.