在硫酸溶液中用有机试剂从废印刷电路板中浸出铜。
Enhancement of leaching copper by organic agents from waste printed circuit boards in a sulfuric acid solution.
机构信息
Key Laboratory of Coal Processing and Efficient Utilization of Ministry of Education, China University of Mining and Technology, Xuzhou, 221116, China; School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou, 221116, China.
Key Laboratory of Coal Processing and Efficient Utilization of Ministry of Education, China University of Mining and Technology, Xuzhou, 221116, China; School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou, 221116, China.
出版信息
Chemosphere. 2022 Nov;307(Pt 4):135924. doi: 10.1016/j.chemosphere.2022.135924. Epub 2022 Aug 4.
Leaching copper from waste printed circuit boards (WPCBs) by hydrometallurgy has always been a hot research topic. At atmospheric pressure, hydrogen peroxide (HO) was used as an oxidant to study the leaching behavior of copper from WPCBs in sulfuric acid (HSO) solution with ethylene glycol (EG). To elucidate the leaching mechanism of copper from WPCBs, the effect of various parameters on the leaching performance with or without EG was investigated. The results showed that the copper leaching process from WPCBs in the presence of EG was found to conform to the ash diffusion-controlled shrinking core model according to the kinetic curve and a activation energy of 18.38 kJ/mol. Moreover, the presence of EG strengthened the stability of HO improved dispersity and increased electrical activity of WPCBs, which enhanced the leaching of copper from WPCBs in the high leaching temperature (>323.15 K). As a result, apart from the fact that the optimal leaching concentration of HO was reduced by the addition of EG, the improved copper leaching efficiency from WPCBs was achieved by the addition of EG, as demonstrated by a maximum copper leaching efficiency of 98.01% and a maximum loss rate of 29.68%. Besides, the mineralogical and morphological properties of leaching residue validated the leaching results. Based on this, our findings confirmed the enhanced leaching performance of copper from WPCBs by EG, which benefited for the efficient recovery of copper from WPCBs.
从废弃印刷电路板（WPCBs）中通过湿法冶金提取铜一直是一个热门的研究课题。在常压下，用过氧化氢（HO）作为氧化剂，在硫酸（HSO）溶液中用乙二醇（EG）研究从 WPCBs 中浸出铜的行为。为了阐明从 WPCBs 中浸出铜的机理，研究了有无 EG 时各种参数对浸出性能的影响。结果表明，根据动力学曲线和 18.38 kJ/mol 的活化能，在 EG 存在的情况下，WPCBs 中铜的浸出过程符合灰分扩散控制收缩核模型。此外，EG 的存在增强了 HO 的稳定性，提高了 HO 的分散性和 WPCBs 的电活性，从而提高了在高浸出温度（>323.15 K）下从 WPCBs 中浸出铜的能力。因此，除了添加 EG 降低了 HO 的最佳浸出浓度外，还通过添加 EG 提高了从 WPCBs 中浸出铜的效率，铜的最大浸出效率达到 98.01%，最大损失率达到 29.68%。此外，浸出残渣的物相和形貌特性验证了浸出结果。在此基础上，证实了 EG 增强了从 WPCBs 中浸出铜的性能，有利于从 WPCBs 中高效回收铜。
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