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相关概念视频

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Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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用驱动的阶段控制,用于选择性地将REE-Fe从NdFeB废物中分离出来.

Xuheng Liu1, Ziming Cao1, Zhongwei Zhao1

  • 1School of Metallurgy and Environment, Central South University, Changsha, 410083, China; Key Laboratory of Hunan Province for Metallurgy and Material Processing of Rare Metals, Changsha, 410083, China.

Journal of environmental management
|March 13, 2026
PubMed
概括

从NdFeB废物中回收稀土元素 (REEs) 是至关重要的. 一种新的ZnCl2辅助化方法有效地将废弃废物从铁中分离出来,实现高回收率并最大限度地减少废物.

关键词:
化烤的方法稀土元素 稀土元素 是一种稀土元素.选择性的REEs-Fe分离方式热力学和动力学.废弃的 NdFeB 是废弃的

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科学领域:

  • 材料科学 材料科学 材料科学
  • 化学工程是化学工程的重要组成部分.
  • 金工业是金工业的一个方面.

背景情况:

  • 在先进技术中对稀土元素 (REEs) 的需求不断增长,需要有效的回收解决方案.
  • 目前用于NdFeB磁铁的回收方法在将REEs从铁中分离时面临挑战,导致大量的废物产生.
  • 初级REE生产的地缘政治集中凸显了可持续回收的重要性.

研究的目的:

  • 开发一种新的,减少废物的过程,从NdFeB废物中回收REEs.
  • 使用ZnCl2辅助化策略,选择性地将REEs与富铁相分离.
  • 优化工艺参数,以实现高REE回收和低铁溶解.

主要方法:

  • 采用了ZnCl2辅助化策略来处理NdFeB废物.
  • 进行了热力学分析,以了解不同大气和温度条件下的相位演变.
  • 实验验证涉及在700°C的空气中进行受控加热,然后进行酸洗.
  • 使用Avrami-Erofeev模型的动态分析阐明了反应机制.

主要成果:

  • 优化的条件 (空气,700°C) 产生了高的REE回收率:99.31%的Nd,93.85%的Dy和98.82%的Pr.
  • 铁溶解被显著抑制,限制在2.30%.
  • 该过程选择性地将转化为酸溶性Cl,同时将铁稳定为不溶性氧化物.
  • 与最佳条件 (惰性大气,≥800°C) 的偏差导致铁溶解的增加或不良的NdFeO3.3的形成.

结论:

  • 在ZnCl2辅助化提供了一个高度选择性和高效的方法,从铁废物回收REE.
  • 这种方法显著减少了铁的共同溶解,克服了传统方法的主要局限性.
  • 该研究表明,一个可扩展和试剂效率高的途径来关闭REE供应循环.