从稀土元素孕液中去除铁,和杂质,使用碳酸碳酸去除杂质
Sicheng Li1, Maziar E Sauber2, Tong Sun1
1Laboratory for Strategic Materials, Department of Chemical Engineering and Applied Chemistry, University of Toronto, 200 College Street, Toronto, ON, M5S 3E5, Canada.
Scientific reports
|May 7, 2025
概括
碳酸有效地从稀土元素溶液中沉铁,和杂质. 这种方法可以在最少的稀土元素损失的情况下实现高污染物去除,提供了具有成本效益的解决方案.
科学领域:
- 金属学和材料科学 金属学和材料科学
- 化学工程是化学工程的重要组成部分.
- 水电金术是指用水电金术进行金术.
背景情况:
- 稀土元素 (REE) 的加工面临着除 impurity 的挑战,影响回收效率.
- 选择性沉对于将有价值的可再生能源与,铁和等污染物分离至关重要.
- 开发具有成本效益和环保的杂质去除方法对于可持续的REE生产至关重要.
研究的目的:
- 通过使用碳酸来研究含有REE的孕溶液 (PLS) 中的,铁和的选择性沉.
- 优化降水条件 (pH,温度,过氧化) 以最大限度地去除杂质并最大限度地减少REE损失.
- 评估拟议降水方法的经济可行性和环境影响.
主要方法:
- 对降水动力学和平衡的实验研究.
- 使用OLI软件进行水体热力学建模.
- 中央复合材料设计 (CCD) 和响应表面方法 (RSM) 用于过程优化.
- 使用XRD,拉曼光谱,ICP-MS和SEM-EDS进行固体沉物的表征.
- 一个大型PLS处理厂的技术经济分析.
主要成果:
- 在最佳条件 (81°C,pH 3.6,0.52 mL H2O2) 中,可以完全去除铁,~95%的和~65%的.
- 在最佳条件下,稀土元素 (TREE) 的总损失保持在3%以下.
- 沉物被确定为铁化,硫酸和碳酸相.
- 热力学模型有质地支持实验中的可溶性趋势.
- 估计的资本成本为约785万美元,每月运营成本为约265万美元,用于1000米3/天的工厂.
结论:
- 碳酸是一种有效的沉剂,可以从REE PLS中去除铁,和杂质.
- 优化的工艺证明了高的杂质去除效率,价值高的REEs的损失最小.
- 开发的方法提供了一种可扩展,具有成本效益和对环境负责任的方法,用于增强REE回收.
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