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Recovery of metallic concentrations from waste printed circuit boards via reverse floatation

机译：通过反向浮选从废印刷电路板上回收金属浓度

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Efficient disposal of waste printed circuit boards (PCBs) is favorable toward recovering valuable components and reducing pollution. Reverse floatation was used to recover metallic concentrations from waste PCBs. Basic properties and mineralogical characteristics of raw PCBs were tested and analyzed. Results indicated that the grade of metallic concentrations declined as the size fraction of PCBs decreased. The major metallic elements found in PCBs were Cu, Pb, and Sn, as well as trace elements were also found in fine PCB particles. Kerosene and terpenic oil were used as the collector and frother in the floatation experiments. The effects of various operational factors, including the feeding concentration, aeration rate, and agitation speed of floatation machine, on the floatation performance of -0.25 mm PCBs were experimentally studied to determine optimal range. The floatation results suggested that the yield of sinks and grade of metallic concentrations diminished significantly with the decrease of size fraction of PCBs. The maximum yields of sinks and highest grades of metallic concentrations were 48.72% and 16.86%, 47.96% and 14.61%, 44.36% and 8.81%, with the optimum recoveries of metallic concentrations of 94.69%, 90.06%, and 75.96% for size fractions of 0.125-0.25 mm, 0.074-0.125 mm, and -0.074 mm PCBs, respectively. The recovery efficiency of metallic concentrations declined as the size fraction decreased. The efficient overall recovery performance of metallic concentrations from waste PCBs was obtained via reverse floatation. This study provides an alternative approach for disposing waste PCBs.
机译：有效处理废印刷电路板（PCB）有助于回收有价值的组件并减少污染。反向浮选用于回收废PCB中的金属浓度。对未加工的多氯联苯的基本性质和矿物学特性进行了测试和分析。结果表明，金属浓度的等级随着PCB尺寸的减小而降低。 PCB中发现的主要金属元素是Cu，Pb和Sn，以及PCB细颗粒中也发现了痕量元素。在浮选实验中，将煤油和萜烯油用作收集剂和起泡剂。通过实验研究了浮选机的进料浓度，曝气速率和搅拌速度等各种操作因素对-0.25 mm PCBs浮选性能的影响，以确定最佳范围。浮选结果表明，随着PCBs尺寸分数的减小，汇的产量和金属浓度等级显着降低。水槽的最高产量和最高等级的金属浓度分别为48.72％和16.86％，47.96％和14.61％，44.36％和8.81％，最佳金属回收率分别为94.69％，90.06％和75.96％ PCB分别为0.125-0.25 mm，0.074-0.125 mm和-0.074 mm PCB。金属浓度的回收效率随着尺寸分数的降低而降低。通过反向浮选，可以从废PCB中有效地回收金属浓缩物。这项研究提供了一种处理废弃PCB的替代方法。

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