Extraction and back-extraction behaviors of 14 rare earth elements from sulfuric acid medium by TODGA

The extraction efficiency of the solution is distinctly influenced by the acidity of the system, and the optimum extraction acidity can be explored by changing the gradient experiment of sulfuric acid concentration. The optimum concentration of sulfuric acid is 6 mol/L. Meanwhile, the extraction rates of rare earth metal ions by TODGA were 99.00%-99.73%.129