使用ZnF化方法从氧铁废物中回收稀土元素的机制和实验研究2
Youwei Liu1, Yuan Zhong1, Xiang Lei1,2,3
1School of Metallurgical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China.
Materials (Basel, Switzerland)
|December 17, 2024
概括
这项研究优化了化烤用于NdFeB废物回收利用,达到97.29%的稀土化率. 这种 pyrometallurgical 方法可以从废物中提升稀土回收.
科学领域:
- 金工程 金工程 金工程
- 材料科学 材料科学 材料科学
- 废物管理 废物管理
背景情况:
- NdFeB废物回收面临的挑战包括原材料的变化,高能耗和低产品价值.
- 从NdFeB磁铁中回收稀土的铁金业复杂.
- 现有的方法在效率和经济可行性方面扎.
研究的目的:
- 为了研究和优化化烤,以从NdFeB废物中提升稀土元素 (REE) 的回收.
- 为了解决 NdFeB 磁铁目前的金回收工艺的局限性.
- 为高效化和随后的 REE 净化建立最佳条件.
主要方法:
- 用热力学计算来评估REE化可行性.
- 一个因素的实验,以确定最初的烤制参数.
- 响应表面方法 (RSM) 以优化烤温度,时间和ZnF2添加.
- 使用盐酸净化化 REEs 的化实验.
主要成果:
- 热力学分析证实了化NDFeB废物中的REEs的可行性.
- 确定了最佳条件:119%的ZnF2添加,828°C的烤温度,91分钟的持续时间,产生97.29%的REE化率.
- 烤在850°C以上的温度下降了化率,与热力学预测一致.
- 添加ZnF2对化率产生了最显著的影响,其次是温度和时间.
- 净化混合化稀土在用9M HCl 浸出后达到98.92%的纯度.
结论:
- 化烤是一种可行的和有效的金方法,用于NdFeB废物回收利用.
- 优化烤条件显著提高了稀土元素化率和回收效率.
- 这一过程为在稀土磁铁回收中推进 pyrometallurgical 应用提供了基础.
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