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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P_(507)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 HNO_3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Tb~(3+)的可能性。通过34级分馏萃取实验,得到纯度≥98％Tb_4O_7,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Tb~(3+)的实验室研究和扩大试验。获得纯度>90％Tb_4O_7。并同时得到纯度>85％Gd_2O_3及>85％Dy_2O_3。工艺连续,无三废。
This paper reports the effects of different equilibrium aqueous phase acidity, rare earth concentration, acidity and washing acidity on the extraction of rare earth elements by P_ (507). The distribution ratio D and the separation factor β were calculated. When the nitric acid concentration is 0.20 ~ 0.80N HNO_3 and the rare earth concentration is 0.01 ~ 0.07M, βDy / Tb≥2.0. Therefore, the possibility of extraction and separation of Tb ~ (3 +) from nitric acid solution was proposed. By 34 fractional extraction experiments, the purity of ≥ 98% Tb_4O_7, the yield of ~ 99% of the results. On this basis, we completed the laboratory research and expansion test of Tb ~ (3+) separation from Tb-Dy group and ammoniated extraction from the medium-heavy rare earth mixture of monazite and yttrium mine. Obtain purity> 90% Tb_4O_7. At the same time, the purity of> 85% Gd_2O_3 and> 85% Dy_2O_3 were obtained. Continuous process, no waste.