共查询到19条相似文献,搜索用时 500 毫秒
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综述了废弃印刷线路板资源化回收处理技术的现状。基于废弃印刷线路板的组成及有价组分分离和提纯机理将资源化回收处理技术归纳为拆解、湿法冶金法、热处理法、机械物理法、生物法和超临界法,并对现有技术发展过程中存在的环境和安全问题进行了初步讨论,为废弃印刷线路板资源化再利用产业化发展提供参考。 相似文献
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Electronic waste, in the form of printed circuit boards (PCBs) or printed wiring boards (PWBs), represents a significant and growing fraction of the waste generated in many communities. It is necessary to identify schemes to manage and dispose this waste in an environmentally safe manner. The present work, examines the use of mechanical means to separate the metallic and non-metallic components present in PCBs. The unique characteristics of PCB construction pose challenges to the mechanical means of separation. In view of these unique characteristics of PCBs, an empirical approach is suggested to evaluate the effectiveness of the mechanical separation process. Two milling operations were used to obtain the feed for the separation using elutriation. Compositions of different size fractions from the milling operations are presented. Experimental data from the separation process is presented and the extent of use of mechanical means that results in optimum separation is identified. The separation efficiency is analyzed in terms of composition, particle size and operating condition of the elutriation flow rate. A probabilistic analysis based on single particle settling velocity shows that separation results with uniform particle size fraction can be described effectively. However, the probabilistic analysis captures only the qualitative features with mixed particle sizes and components. 相似文献
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对电子废弃物资源化处理进行了分析,提出了实现电子废弃物资源化处理的对策。通过对废弃电路板破碎解离及解离后有价成分的分析,采用脉动气流分选装置对电子废弃物中有价成分的回收进行了研究,并取得了初步进展。 相似文献
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电子元器件的拆卸对于废旧印刷电路板(waste printed circuit boards,WPCBs)的资源化利用具有重要意义,是废旧印刷电路板回收利用必不可少的环节。文章利用热空气作为预热气源和脉冲喷吹气源,采用自主设计的WPCBs拆卸设备进行拆卸实验,运用正交试验方法研究了拆卸工艺参数对电路板拆卸率的影响,优化了工艺参数,并对影响原因进行了分析。实验结果表明:小贴片元器件拆卸率与元器件总拆卸率随喷吹次数增加先增大后减小;当进气温度为240℃、加热时间为5min、喷吹次数为10次时,插槽元器件、通孔元器件、大贴片元器件拆卸率大部分在95%以上,小贴片元器件拆卸率最高达80%以上,且元器件总拆卸率达85%以上。利用热空气作为预热气源和喷吹气源拆卸WPCBs的最优实验参数为:进气温度为240℃,加热时间为5min,喷吹次数为10次。 相似文献
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利用电镜扫描、X射线荧光光谱和红外光谱分析废纸基PCBs非金属粉以及对复合材料力学性能和热性能测试,研究了废纸基PCBs非金属粉性质及对复合材料性能的影响,结果表明:废纸基PCBs中含少量玻璃纤维,绝大多数是树脂聚合物,颗粒表面存在羟基、羰基、缩醛基、硅醇基等官能团,是极性材料;非金属粉经改性后与基体PP混合表现出很好的相容性,有效提高复合材料弯曲强度和维卡软化温度(VST),增加复合材料的阻燃性能;复合材料弯曲强度随非金属粉添加量增加而增大,0.08cm(180目)非金属粉添加量30%时可提高弯曲强度9.1MPa,VST约提高2℃;小颗粒非金属粉有利于复合材料性能改善,可作为填料制作PP复合材料。 相似文献
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Study on Metals Recovery from –0.074 mm Printed Circuit Boards by Enhanced Gravity Separation 总被引:2,自引:0,他引:2
Nowadays study on discarded printed circuit boards (PCBs) reutilization has great significance for achieving secondary resources recycling and preventing environmental pollution. Physical methods show great potential and advantages on discarded PCBs reutilization, comparing with chemical and biological methods. However for the particles of -0.074 mm PCBs, little work has been done in the past because of lower separation efficiency and recovery. In this paper, the conundrum of -0.074 mm PCBs reutilization was resolved successfully with the help of Falcon concentrator. Separation mechanism for fine particles with different mass densities in a Falcon centrifugal concentrator was analyzed. The main factors such as magnitude of rotation frequency (centrifugal acceleration), anti-charge water pressure and feeding concentration were studied, and interaction of different factors was analyzed using Design-Expert software. The experimental results show that metals grade of -0.074 mm PCBs and integration efficiency were obtained as 76.89% and 80.77% respectively when feeding concentration was 40 g/L with water pressure of 0.01 MPa and rotation frequency of 50 Hz. 相似文献