用D2EHPA提取稀土元素的第三阶段形成:关键因素和对液膜提取性能的影响
Raquel Rodríguez Varela1, Alexandre Chagnes2, Kerstin Forsberg1
1KTH Royal Institute of Technology, Department of Chemical Engineering, Teknikringen 42, 114 28 Stockholm, Sweden.
Membranes
|July 25, 2025
概括
在用D2EHPA提取稀土元素 (REE) 的过程中,空洞纤维更新液体膜 (HFRLMs) 的第三阶段形成可以得到缓解. 优化料成分和使用特定的稀释剂和添加剂,如三丁酸盐 (TBP),可以防止膜污染.
科学领域:
- 化学工程是化学工程的重要组成部分.
- 材料科学 材料科学 材料科学
- 水电金术是指用水电金术进行金术.
背景情况:
- 空洞纤维更新液体膜 (HFRLMs) 对于稀土元素 (REE) 提取至关重要.
- 使用 bis ((2-乙烯基酸) (D2EHPA) 的第三阶段形成可能会阻碍HFRLM的效率.
- 了解影响第三阶段形成的因素对于流程优化至关重要.
研究的目的:
- 调查水性料和有机相组合对第三相形成的影响.
- 为了确定在D2EHPA中REE (III) 的有机度 (LOC) 的限制值.
- 确定防止HFRLM过程中第三阶段形成的策略.
主要方法:
- 在水性料中REE度和pH的系统变化.
- 对有机相组合的分析,包括稀释剂类型和D2EHPA度.
- 评估修饰剂,特别是三丁酸盐 (TBP) 的作用.
主要成果:
- 增加的REE度和更高的pH值导致了减少的质量转移.
- 与其他REEs相比,具有更高的诱导第三阶段形成的倾向.
- 线性亚利法性稀释剂,低D2EHPA度 (5-10v/v%),缺乏修饰剂有利于第三阶段的形成.
结论:
- 第三阶段的形成受到料阶段参数和有机阶段组成的影响.
- 三丁酸盐 (TBP) 有效地减轻了第三阶段的形成,没有协同效应.
- 可以制定配方策略,以防止REE开采的D2EHPA基于HFRLM系统的第三阶段形成.
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