【摘要】 本文报导了不同平衡水相酸度、稀土浓度、相比及洗涤酸度对P₅₀₇萃取稀土元素的影响。计算了分配比D及分离因数β。在硝酸浓度为0.20～0.80N HNO₃及稀土浓度为0.01～0.07M时,βDy/Tb≥2.0。从而提出了从硝酸溶液中萃取分离Tb³⁺的可能性。通过34级分馏萃取实验,得到纯度≥98％Tb₄O₇,收率～99％的结果。在此基础上,完成了从独居石及褐钇钶矿的中重稀土混合物中,经Tb-Dy分组及氨化萃取分离Tb³⁺的实验室研究和扩大试验。获得纯度>90％Tb₄O₇。并同时得到纯度>85％Gd₂O₃及>85％Dy₂O₃。工艺连续,无三废。更多还原

【Abstract】 This paper reports the influence of different acidities of equilibrated aqueous phase, Concentrations of RE³⁺, phase ratios, and acidities of washing solution etc, on the extraction of Rare-earth elements from the nitric acid solution by P507. The distribution ratio D and separation factor β are calculated.When the concentration of nitric acid is 0.20～0.80N and that of Rare-earth is 0.01～0.07M, the separation factor β Dy/Tb is ≥2.0. Therefore, it is possible to separate Tb³⁺ from nitric acid solution. Through the experimental fractional extraction （34 Steps） from the mixture solution containing the elements of （Gd） Tb, Dy, Ho, Er（y） etc, the purity of Tb₄O₇ obtained is ≥98% with the recovery up to 99%.Base on the experiments mentioned above, both the laboratory Work and large-scale experiments have been done on the fractionation of the mixture obtained,from monazite and fergusonite into concentrates of Gd-Tb, Dy, Ho and Er, as well as the separation of Tb³⁺ from the Gd-Tb concentrate by extraction with P507 amoniated extractant. The purity of obtained Tb₄O₇, Gd₂O₃ and Dy₂O₃ is >90%, >85%, and >85% respectively.This extraction technology is a continuous process without effluents.更多还原