Selective recovery and separation of copper and iron from fine materials of electronic waste processing
Selective recovery and separation of copper and iron from fine materials of electronic waste processing
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电子垃圾处理细料中铜、铁的选择性回收分离
DOI：
10.1016/j.mineng.2018.04.021
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发表时间：
2018
影响因子：
4.8
通讯作者：
Mishra, Brajendra
中科院分区：
文献类型：
--
作者：
Lee, Hyunju;Mishra, Brajendra
随着电子废物的增加，其处理过程中产生的烟尘和废水等副产品也在增加。在这项研究中，通过机械和热方法处理电子废物中产生的精细材料进行了研究，以有效地回收和分离有价值的金属，包括铜和铁，使用物理和化学方法。该样品中的Fe主要以磁铁矿的形式存在，如通过XRD所确定的，并且通过磁性分离来去除。三种不同的酸溶液（HNO 3，HCl和H2SO 4）用于选择性铜回收。所有实验均在不同的时间长度（1-10小时）和温度范围（20-60 °C）下进行。采用收缩核模型研究了Cu在HNO 3中的溶解动力学，其活化能约为5.0 kcal/mol。Cu在HNO 3中的溶解速度比Fe和Al等其他金属快，在H2SO 4中，Cu没有溶解，而Fe在60 °C下约4 h后完全溶解。根据各种浸出的结果和动力学研究，进行了选择性金属回收的两步法。采用H2SO 4溶解Fe作为第一步浸出过程，HNO 3溶解Cu作为第二步浸出过程。通过该两步工艺，获得了分别约90%和98%的Fe和Cu浸出效率。
As electronic waste (e-waste) is increasing, its by-products such as flue dust and wastewater, which are generated during its treatment process, are also increasing. In this study, the fine material generated in the processing of e-waste by both mechanical and thermal methods was investigated for the effective recovery and separation of valuable metals, including Cu and Fe, using both physical and chemical methods. The Fe in this sample was present mostly as magnetite, as determined by XRD, and was removed by magnetic separation. Three different acid solutions (HNO3, HCl, and H2SO4) were used for selective Cu recovery. All experiments were conducted with varying length of time (1–10 h) and temperature ranges (20–60 °C). The kinetics of Cu dissolution in HNO3was studied, based on the shrinking core model, and the activation energy was about 5.0 kcal/mol. The dissolution of Cu in HNO3was faster than that of other metals such as Fe and Al. In the case of H2SO4, dissolution of Cu was not observed, while Fe was completely dissolved after about 4 h at 60 °C. Based on the results of various leaching and the kinetic study, a two-step process was performed for selective metal recovery. H2SO4was used to dissolve Fe as the first leaching process and HNO3was used for Cu dissolution as the second leaching process. Through this two-step process, Fe and Cu leaching efficiencies were obtained at approximately 90% and 98%, respectively.
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