【摘要】 在还原萃取分离铕的反萃余液中加入NH₄Cl,用固体NH₄HCO₃与稀土反应生成碳酸稀土沉淀,而Zn与NH₄Cl形成配合物存在于母液中,实现反萃余液中稀土和锌的分离。考察了料液中NH₄Cl,RECl₃,Zn Cl₂浓度、沉淀终点p H和沉淀反应温度这些因素对碳酸稀土中Zn O含量的影响。实验结果表明:在料液中NH₄Cl浓度4 mol·L^-1,RECl₃浓度0.34 mol·L^-1,Zn Cl₂浓度不大于0.62 mol·L^-1,反应温度50℃,沉淀终点p H为6.5条件下,得到的碳酸稀土中Zn O含量小于0.005%。更多还原

【Abstract】 The separation of rare earth and zinc was achieved when the solid ammonium bicarbonate was reacted with rare earth to produce rare earth carbonate precipitation,and zinc and NH₄Cl formed a complex in the mother liquor by adding NH₄Cl in the stripping residual liquid of the reduction extraction of europium.The influence of the concentrations of NH₄Cl,RECl₃and Zn Cl₂in the feed liquid,the final p H and the reaction temperature on the content of Zn O in rare earth carbonate was investigated.The results showed that the concentrations of NH₄Cl,RECl₃and Zn Cl₂successively were 4,0.342 mol·L^-1and less than 0.615 mol·L^-1in the feed liquid,the reaction temperature was 50℃and the final p H value was 6.5,the content of Zn O in the rare earth carbonate was less than 0.005%.更多还原