• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Separation and Purification Technology >Development of a solvometallurgical process for the separation of yttrium and europium by Cyanex 923 from ethylene glycol solutions
【24h】

Development of a solvometallurgical process for the separation of yttrium and europium by Cyanex 923 from ethylene glycol solutions

机译：从乙二醇溶液中氰化氢和铕和铕分离钇和铕的溶剂质矿产方法

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Recycling of critical raw materials such as rare-earth elements (REEs) is increasingly crucial in the development of a sustainable economy. Separation of individual REEs (mainly yttrium and europium) from lamp phosphor waste has become essential due to the substantial stockpiling of end-of-life fluorescent lamps. The mutual separation of Y(III) and Eu(III) from aqueous chloride solutions with solvating extractants by conventional extraction methods is highly inefficient. Hence, separation of Y(III) and Eu(III) was investigated using a novel technique called "non-aqueous solvent extraction". Unlike conventional solvent extraction, the new approach uses two immiscible organic phases (more polar (MP) and less polar (LP)) instead of an aqueous and an organic phase. The present work describes a new solvometallurgical process for the separation of Y(III) and Eu(III) from ethylene glycol solutions using the solvating extractant Cyanex 923 in an aliphatic diluent. This extraction system exhibits improved separation compared to extraction from aqueous solutions. Following predictions based on a McCabe-Thiele diagram, a three-stage counter-current extraction simulation was carried out to extract Y(III) quantitatively, with 7% co-extraction of Eu(III) at a volume phase ratio of MP:LP of 1.5:1. The coextracted Eu(III) was selectively scrubbed in two stages using an Y(III) scrub solution. Y(III) was recovered from the loaded less polar organic phase by precipitation stripping with an aqueous oxalic acid solution and a subsequent calcination step. Y2O3 with a purity of more than 99.9% was obtained. A complete process flow sheet, comprising extraction, scrubbing and stripping steps for the separation of Y(III) and Eu(III) is reported. The feasibility of the developed process was successfully demonstrated in continuous mode using a battery of mixer-settlers.
机译：在可持续经济的发展方面越来越重要的稀土元素（REES）的关键原料回收越来越关心。由于储存终生荧光灯的实质性储存，从灯荧光粉废物中分离单个REES（主要是YTTRIUM和EUROPIOM）对荧光灯的实质性储存。通过常规提取方法与溶剂化萃取剂的氯化物溶液中的Y（III）和EU（III）的相互分离是高效的。因此，使用一种称为“非水溶剂萃取”的新技术研究了Y（III）和EU（III）的分离。与常规溶剂萃取不同，新方法使用两个不混溶的有机相（更多极性（MP）和更低的极性（LP））代替水性和有机相。本作本作者描述了一种使用溶剂化萃取剂Cyanex 923在脂族稀释剂中从乙二醇溶液中分离乙二醇溶液的y（iii）和欧盟（iii）的新的溶剂膜。与水溶液萃取相比，该提取系统表现出改善的分离。在基于McCabe-Thiele图的预测之后，进行三级逆流提取模拟以定量地提取y（iii），以MP：LP的体积相比为7％的EU（III）共提取1.5：1。使用Y（III）擦洗溶液选择性地擦洗共延迟EU（III）。通过用草酸水溶液和随后的煅烧步骤从负载较低的极性有机相中从负载较低的极性有机相中回收Y（III）。纯度超过99.9％的Y2O3。报告了一种完整的工艺流程图，包括用于分离Y（III）和EU（III）的提取，擦洗和剥离步骤。使用混合器定居者的电池成功地在连续模式下在连续模式下证明了开发过程的可行性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号