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用jarosite工艺从航空航天磁性材料废料的硫酸浸出溶液中选择性去除铁

Xuejiao Zhou¹, Yongli Chen¹, Fei Tan¹

¹School of Metallurgy and Power Engineering, Chongqing University of Science and Technology, Chongqing 401331, China.

Waste management (New York, N.Y.)

|August 15, 2024

概括

本研究介绍了用于从航空航天合金漏溶液中选择性去除铁的罗石工艺. 优化的方法实现了超过99%的铁去除,同时最大限度地减少了和的损失.

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
水电金术是指用水电金术进行金术.

背景情况:

航空航天磁性材料废料含有有价值的和.
硫酸浸提取这些金属,但也溶解了大量的铁.
选择性去除铁对于高效的和回收至关重要.

研究的目的:

开发和优化用于选择性去除铁的罗石过程.
调查使用过氧化 (H2O2) 去除铁的热力学基础.
描述jarosite产物,并了解结晶动力学.

主要方法:

建立了K-S-Fe-H2O系统的Eh-pH图.
使用过氧化 (H2O2) 氧化Fe2+到Fe3+进行选择性沉.
优化反应条件:温度,K2SO4剂量,种子剂量,时间和pH值.
使用X射线衍射 (XRD) 和扫描电子显微镜与能量分散X射线光谱 (SEM-EDS) 进行了jarosite产品的特征.

主要成果:

在最佳条件下 (95°C,pH~3) 达到>99%的铁去除效率.
将和的损失降至2%以下.
确定该产品为jarosite ((K,H3O) Fe3(SO4) 2(OH) 6),具有圆形结构 (0.2-5.0 μm).
使用Avrami方程 (n ≈2.5,激活能量 ≈42.68 kJ/mol) 确定jarosite结晶动力学.

结论:

由H2O2氧化增强的罗石过程有效地和选择性地去除铁.
优化的条件确保了高铁去除率和最小的贵金属损失.
过程参数显著影响反应动力学,产品形态和结晶性.

关键词:

航空航天材料废弃物结晶运动的动力学雅罗石的工艺过程.选择性去除铁的方法热力学热力学热力学

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