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溶剂萃取法是稀土分离提纯的主要方法之一，但在工业生产过程中常因工艺条件控制不当而发生乳化现象。为了解决这一难题，研究了以表面活性剂Span 80为调控剂、P507为萃取剂、煤油为稀释剂萃取稀土，考察了水相pH、搅拌速度和水油相比对Er3+萃取率和萃余液中油质量浓度的影响，并采用响应面法对工艺参数进行了优化。优化结果表明；在水相pH=3.5、搅拌速度130 r/min、水油相比4∶1优化条件下萃取5 min, Er3+萃取率可达95.42%,萃余液中油质量浓度仅为1.68 mg/L,预测值与试验结果吻合度较高；加入Span 80能有效防止乳化现象发生，调控作用明显。
Abstract：Solvent extraction is one of the main methods for rare earth separation and purification, but emulsification often occurs in industrial production due to improper control of process conditions.In order to solve the problem, the extraction of rare earth with the surfactant Span 80 as the regulator, P507 as the extractant and kerosene as the diluent was studied. The effects of aqueous pH,stirring speed and water-oil phase ratio on the extraction rate of Er3+ and the mass concentration of oil in the raffinate were investigated, and the process parameters were optimized by response surface method. The optimization results show that under the optimal conditions of aqueous pH=3.5,stirring speed of 130 r/min and water-oil phase ratio of 4∶1 for 5 min, the extraction rate of Er3+ can reach 95.42%,and the oil concentration in the raffinate is only 1.68 mg/L.The predicted value is in good agreement with the experimental results.The addition of Span 80 can effectively prevent emulsification, and the regulation effect is obvious.
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基本信息:
DOI：10.13355/j.cnki.sfyj.2025.03.013
中图分类号:TF845
引用信息:
[1]张秋露,刘杰,王志荣等.Span 80-P507体系萃取稀土防止乳化试验研究[J].湿法冶金,2025,44(03):388-397.DOI:10.13355/j.cnki.sfyj.2025.03.013.
基金信息:
国家自然科学基金资助项目(52174336); 山东省自然科学基金资助项目(ZR2021MB051)