Abstract:The effects of extracting rare earth by concentration crystallization method and oxalate precipitation method from phosphoric acid solution were investigated. The results show that increasing degree of phosphoric acid solution concentration with certain range is in favor of ∑REO crystallization. Crystallization rate of ∑REO is 69.31% when concentration ratio is 0.42. As high as about 11% under the chosen dosage and concentration of oxalate acid, the precipitation rate of ∑REO can reach to 62.29% when phosphate solution is twice concentrated by evaporation and addition of oxalic acid.