Recycling metals from -0.5 mm waste printed circuit boards by flotation technology assisted by ionic renewable collector
Recycling metals from -0.5 mm waste printed circuit boards by flotation technology assisted by ionic renewable collector
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DOI：
10.1016/j.jclepro.2020.120628
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发表时间：
2020-06
影响因子：
11.1
通讯作者：
Xiang-nan Zhu;Hao Zhang;Chun-chen Nie;Xin-yu Liu;X. Lyu;Y. Tao;J. Qiu;Lin Li;Guangwen Zhang-Guang
中科院分区：
文献类型：
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作者：
Xiang-nan Zhu;Hao Zhang;Chun-chen Nie;Xin-yu Liu;X. Lyu;Y. Tao;J. Qiu;Lin Li;Guangwen Zhang-Guang
-0.5 mm废弃印刷电路板（WPCB）中的金属可通过浮选技术有效回收。离子可再生捕收剂由废油制备，随后用于-0.5 mm WPCB的浮选。利用扫描电镜（SEM）对再生捕收剂和WPCBs粉末的形貌进行了分析。进行了室内浮选试验，分析了浮选性能。用红外光谱（FT-IR）研究了捕收剂的吸附行为。扫描电镜结果表明，捕收剂的粒径在微米级，杂质颗粒呈条状分布。证明玻璃纤维表面存在有机物，有助于增强其疏水性。FT-IR分析结果表明，捕收剂和WPCBs粉末中均含有疏水和亲水基团，有利于增加捕收剂的吸附点，强化浮选过程。实验室浮选试验结果表明，精矿产率随捕收剂用量的增加而降低。当捕收剂用量为2kg/t时，铜精矿品位为31.32%，回收率为65.75%，铁精矿品位为37.28%，回收率为14.55%。该研究为废弃多氯联苯中金属的回收利用提供了一种替代方法。
Metals in −0.5 mm waste printed circuit boards (WPCBs) are effectively recycled by flotation technology. Ionic renewable collector was prepared from waste oils and subsequently used in flotation of −0.5 mm WPCBs. Morphology of renewable collector and WPCBs powder was detected by scanning electron microscope (SEM). Laboratory flotation tests were conducted to analyze the flotation performance. The adsorption behavior of the collector was revealed by infrared spectroscopy (FT-IR). SEM results show that the particle size of collector is in the micron scale and the impurity particles in WPCBs are in strip shape. Organic matter is proved to exist on the glass fibers surface, which helps to enhance its hydrophobicity. FT-IR analysis results indicate that both the collector and WPCBs powder contain hydrophobic and hydrophilic groups, which help to increase the attachment point of collector to strengthen the flotation process. Laboratory flotation test results show that the concentrate yield decreases with the increase of collector dosage. When the collector dosage is 2 kg/t, copper and iron grade in concentrate reaches 31.32% and 37.28% with the recovery of 65.75% and 14.55%, respectively. The study has provided an alternative method for the recycling of metals in WPCBs.