Abstract:Process parameters of oxalic acid stripping and direct precipitation loading of yttrium-rich P507 organic phase were studied. Effects of oxalic acid dosage, stripping temperature, O/A ratio, stripping time, and stripping series on RE stripping rate were investigated. The results show that stripping rate of yttrium-rich rare earth is 99.45 % and TREO in yttrium-rich product is 98.0% above with Cl-<0.05% and residual carbon of 0.042% under the optimum conditions including oxalic acid dosage of 130% of theoretical value, stripping temperature of 20 ℃, O/A=1/1, stripping time of 20 min, and stripping series of 11.