草酸反萃沉淀法从负载钇的P507中提取富钇

Extraction of Yttrium-rich from P507 Loaded with Yttrium by Oxalic Acid Stripping

研究了草酸反萃并直接沉淀负载富钇的P507有机相中富钇的工艺参数,考察了草酸反萃富钇过程中草酸用量、反萃温度、反萃相比O/A、反萃时间、反萃级数对稀土反萃率的影响。结果表明,草酸反萃最佳的工艺参数为:草酸用量为理论值的130%、反萃温度25℃、O/A=1/1、反萃时间20min、反萃级数11级,在此条件下,富钇稀土反萃率为99.45%,所得富钇产品质量为TREO>98.0%、Cl^-<0.05%、残碳0.042%。

Process parameters of oxalic acid stripping and direct precipitation loading of yttrium-rich P507 organic phase were studied.Effects of oxalic acid dosage,stripping temperature,O/A,stripping time,and stripping series on RE stripping rate were investigated.The results show that stripping rate of yttriumrich rare earth is 99.45%and TREO in yttrium-rich product is 98.0%above with Cl^-<0.05%and residual carbon of 0.042%under the optimum conditions including oxalic acid dosage of 130%of theoretical value,stripping temperature of 20℃,O/A=1/1,stripping time of 20 min,and stripping series of 11.