Extraction and stripping properties of Sc3+ were investigated by using a mixed extractant of VA10 and TBP. The effect of adding TBP to VA10 was considered by analyzing the binding state of VA10 and TBP by FT-IR. Solvent extraction of scandium from an aqueous solution of Sc3+-Ti4+-Zr4+, which simulates wastewater from the titanium oxide manufacturing process, the Byers process and others, was performed, and the separation factor of Sc3+ over Ti4+ and Zr4+ was investigated. To clarify the operating conditions of a countercurrent multistage process for Sc3+, McCabe-Thiele analysis was applied to the extraction isotherm and stripping isotherm of Sc3+. The extraction pH of Sc3+ was found to shift to higher pH, and Sc3+ was stripped at a lower concentration of H2SO4 by adding TBP to VA10. Addition of TBP to VA10 suppresses the extraction of Sc3+ and promotes the stripping of Sc3+. IR spectra of the organic phase suggested that the dimeric portion of VA10 forms hydrogen bonds with TBP. The extractions of Sc3+, Ti4+ and Zr4+ were 77%, 3% and 8%. The separation factors of these metal ions were beta Sc/Ti=100 and beta Sc/Zr=38 at pH 4.6 on extraction with VA10+TBP from aqueous solution of Sc3+-Ti4+-Zr4+. Stripping of Sc3+, Ti4+ and Zr4+ occurs at a rate of 100%, 8% and 22% by using 0.5 mol/dm(3) H2SO4. From these results, it is possible to separate Sc3+ from impurities such as Ti4+ and Zr4+ by countercurrent multistage extraction, and Sc3+ is recovered by countercurrent one-stage stripping with 0.5 mol/dm(3) H2SO4. Extraction of Sc3+ from the dilute aqueous solution containing 500 mg/dm(3) of Sc3+ reached 99% at the flow ratio (A/O)=1.01 in the two-stage countercurrent extraction, and Sc3+ in the organic phase is stripped to reach a 6-fold concentration by applying one-stage stripping with flow ratio of (O/A)=6.00.