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在SmCl_3和ZnCl_2混合溶液中加入NH4Cl,用碳酸氢铵沉淀法实现Sm3+和Zn2+分离,制备氧化钐产品。研究了料液中SmCl_3、ZnCl_2、NH4Cl浓度、沉淀终点pH值和沉淀反应温度对Sm_2O_3产品中ZnO含量的影响。结果表明,最佳工艺参数为料液中SmCl_3、ZnCl_2、NH_4Cl浓度分别为0.6mol/L、0.0614mol/L、3mol/L,沉淀终点pH值为6.0,反应温度60℃,料液中锌不沉淀,以ZnCl_4~(2-)存在碳酸钐沉淀母液中,得到的Sm_2O_3产品中ZnO含量小于5×10~(-5)。
In the mixed solution of SmCl_3 and ZnCl_2, NH4Cl was added, and Sm3 + and Zn2 + were separated by ammonium bicarbonate precipitation to prepare samarium oxide. The effects of SmCl_3, ZnCl_2, NH_4Cl concentration in the feed solution, the pH value of the precipitation end point and the precipitation reaction temperature on the ZnO content in the Sm_2O_3 product were studied. The results showed that the optimal process parameters were as follows: the concentration of SmCl_3, ZnCl_2 and NH_4Cl in the feed solution were 0.6mol / L, 0.0614mol / L, 3mol / L, the final pH was 6.0, the reaction temperature was 60 ℃, Precipitation, ZnCl_4 ~ (2-) presence of samarium carbonate precipitation mother liquor, the resulting Sm_2O_3 product ZnO content of less than 5 × 10 ~ (-5).