Synthesis of cuprous chloride and simultaneous recovery of Ag and Pd from waste printed circuit boards.
Synthesis of cuprous chloride and simultaneous recovery of Ag and Pd from waste printed circuit boards.
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DOI：
10.1016/j.jhazmat.2013.07.057
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发表时间：
2013-10
影响因子：
13.6
通讯作者：
Zhi-yuan Zhang;Fu-Shen Zhang
中科院分区：
文献类型：
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作者：
Zhi-yuan Zhang;Fu-Shen Zhang
研究了一种从废弃印刷电路板中合成氯化亚铜并同时回收银和钯的工艺。该工艺的主要优点是不使用腐蚀性酸和强氧化剂。采用热震法对多氯联苯进行预处理，得到金属颗粒（MPs），然后在氯化钠存在下将MPs与硫酸铜反应生成氯化亚铜。最佳的VNaCl/mCuSO 4（mL/g）比、[Cu]/[Cu 2+]摩尔比、处理时间和操作温度分别为6、0.95、30 min和60° C。通过两个合成循环，可以从PCB中回收约98.5%的Cu。在合成过程中，由于Cu 2+在体系中起氧化剂的作用，Ag和Pd可通过形成稳定的氯化物络合物同时回收。银和钯的回收率分别为93.9%和95.3%。因此，人们认为，在目前的研究中开发的过程是良性的和实用的铜和贵金属（银，钯）回收废多氯联苯。
A benign and effective process for cuprous chloride synthesis and simultaneously recovery of Ag and Pd from waste printed circuit boards (PCBs) was developed in the present study. The main merit of the process is that neither corrosive acid nor strong oxidant was used. The PCBs were firstly pretreated by thermal shock process to obtain metallic particles (MPs), then cuprous chloride was synthesized by reacting MPs with cupric sulfate in the presence of sodium chloride. The optimum V Nacl/m CuSO 4 (mL/g) ratio,[Cu]/[Cu 2+] mole ratio, treatment time and operation temperature were 6, 0.95, 30 min and 60° C, respectively. Approximately 98.5% of Cu could be recovered from the PCBs through two synthesis circles. During the synthesis process, Ag and Pd could be simultaneously recovered by forming a stable chloride complex since Cu 2+ played the role of oxidant in the system. The recovery percentages of Ag and Pd were 93.9% and 95.3%, respectively. Accordingly, it is believed that the process developed in the current study is benign and practical for copper and precious metal (Ag, Pd) recovery from waste PCBs.