Completely separating metals and nonmetals from waste printed circuit boards by slurry electrolysis
Completely separating metals and nonmetals from waste printed circuit boards by slurry electrolysis
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DOI：
10.1016/j.seppur.2018.04.069
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发表时间：
2018-10
影响因子：
8.6
通讯作者：
Deze Yang;Yingying Chu;Jianbo Wang;Mengjun Chen;Jiancheng Shu;Fu-Rong Xiu;Zhonghui Xu;Shuhui Sun-Shuhui
中科院分区：
文献类型：
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作者：
Deze Yang;Yingying Chu;Jianbo Wang;Mengjun Chen;Jiancheng Shu;Fu-Rong Xiu;Zhonghui Xu;Shuhui Sun-Shuhui
从废弃印刷电路板（WPCB）中完全分离和回收金属和非金属是电子废物回收的关键。在这里，我们提出了一种新颖的方法，即浆料或悬浮液电解，从 WPCB 中分离金属和非金属。详细讨论了浆料电解过程中影响分离率的因素。结果表明，CuSO4·5H2O、NaCl、H2SO4、WPCBs 用量、电流和时间都会影响 WPCBs 中金属的分离。提高NaCl和H2SO4浓度以及延长电解时间可以有效提高金属与非金属分离率，而增加WPCBs用量和电流对金属与非金属分离率产生负面影响。在100mL电解液中添加3g WPCBs、30g/L CuSO4·5H2O、40g/L NaCl、150g/L H2SO4、0.5A、9h条件下，浆液电解可以直接从WPCBs中完全分离和回收金属，分离率高达97.79%。分离出的微金属粉末主要为Cu，约86.6%，不含任何非金属粉末。回收的铜呈树枝状，铜回收率高达近99%。因此，矿浆电解在电子废物再利用方面展现了广阔的前景，为各类城市矿山提供了一种富集金属的方法。
Completely separating and recovering metals and nonmetals from waste printed circuit boards (WPCBs) is key to e-waste recycling. Here we proposed a novel approach, slurry or suspension electrolysis, to separate metals and nonmetals from WPCBs. The factors that impact the separation rate during the slurry electrolysis were discussed in detail. The results indicate that CuSO4·5H2O, NaCl, H2SO4, WPCBs dosage, current and time could impact metals separating from WPCBs. Increasing NaCl and H2SO4concentration and extending electrolysis time could effectively increase the metal and nonmetal separation rate, while increasing WPCBs dosage and current have negative impacts on the metal and nonmetal separation rate. Slurry electrolysis could directly and completely separate and recover metals from WPCBs with a separation rate up to 97.79% under the conditions of 3 g WPCBs dosage in 100 mL electrolyte, 30 g/L CuSO4·5H2O, 40 g/L NaCl, 150 g/L H2SO4, 0.5 A and 9 h. The separated micro-metal powders are mainly Cu, about 86.6%, without any nonmetal powders. Copper recovered is dendritic, with a copper recovery rate up to nearly 99%. Thus, slurry electrolysis shows a prospective future in e-waste reutilization, providing a way to enrich metals for all kinds of urban mines.