In order to clarify the solvent extraction and separation behaviors of rare earths and impurity of Al during the extraction and enrichment of low-concentration leach solution of ion-adsorption rare earth ore, the extraction mechanism and separation behaviors of Nd³⁺ and Al³⁺ in the Nd₂(SO₄)₃–Al₂(SO₄)₃ mixed solution using P507 were studied in this work. The extraction of Nd³⁺ and Al³⁺ follows the cation exchange mechanism. With the increase of the equilibrium pH, β_Nd/Al in the extraction of the Nd₂(SO₄)₃–Al₂(SO₄)₃ mixed solution using P507 is always higher than that in the extraction of single Nd₂(SO₄)₃ and Al₂(SO₄)₃ solutions. It can be attributed to the fact that the extraction of Nd³⁺ using P507 is much faster than that of Al³⁺, and Al³⁺ is more prone to be hydrolyzed at lower pH. β_Nd/Al in the extraction of the Nd₂(SO₄)₃–Al₂(SO₄)₃ mixed solution decreases gradually with the increase of mixing time within the equilibrium pH range of 1.5–1.9. The extraction of Nd³⁺ using P507 is much faster than that of Al³⁺, but the stability of Al³⁺-loaded organic phase is better than that of Nd³⁺-loaded organic phase, thus Nd³⁺ in the Nd³⁺-loaded organic phase is gradually replaced by Al³⁺ in the aqueous phase with the increase of mixing time.

为阐明离子吸附稀土矿低浓度浸出液萃取富集过程中稀土和杂质Al的溶剂萃取分离行为，Nd ³⁺和Al ³⁺的萃取机理及分离行为本工作研究了在 Nd ₂ (SO ₄ ) ₃ -Al ₂ (SO ₄ ) ₃混合溶液中使用 P507。^{Nd 3+}和Al ³⁺的萃取遵循阳离子交换机制。随着平衡 pH 值的增加，β _Nd/Al在 Nd ₂ (SO ₄) ₃ –Al ₂ (SO ₄ ) _{3混合溶液使用P507萃取Nd 2} (SO ₄ ) ₃和Al ₂ (SO ₄ ) ₃单一溶液时的萃取率始终高于单一溶液。这可以归因于P507对Nd ^{3+的提取比Al 3+}快得多，并且Al ³⁺在较低pH下更容易水解。β _Nd/Al萃取 Nd ₂ (SO ₄ ) ₃ –Al ₂ (SO ₄ )_{3混合溶液在1.5-1.9}的平衡pH范围内随着混合时间的增加而逐渐减少。^{P507对Nd 3+}的萃取速度远快于Al ^{3+ ，但负载Al 3+}的有机相的稳定性优于负载Nd ³⁺的有机相，因此Nd ³中的Nd ³⁺随着混合时间的增加，负载⁺的有机相逐渐被水相中的Al ^3+取代。