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首页> 外文会议>Electronics Recycling Asia >Recycling of Precious Metal Palladium from Printed Circuit Boards (PCBs) of Waste Mobile Phones
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Recycling of Precious Metal Palladium from Printed Circuit Boards (PCBs) of Waste Mobile Phones

机译：从废手机印刷电路板（PCB）的贵金属钯回收

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Precious metals are widely used in electronic equipments because of their distinctive high conductivity, ability to carry low ampere current, high sensitivity and resistance to corrosion. In era of rapid technological advancement demand for latest electronic gadgets is on a rise. Obsolescence and dead electronic goods lead to generation of huge amount of e-waste. In order to meet increasing demand of electronic equipments, conserve conventional reserves from depleting and handle the burden of e-waste economically, it is necessary to recycle and develop e-waste as an alternative resource of precious metals. Among waste electrical and electronic equipments (WEEEs), printed circuit boards (PCBs) of discarded mobile phones were targeted. These PCBs gained attention because of their high content of Gold (350 ppm), Silver (1380 ppm) and Palladium (210 ppm) which is around 10-100 times higher than that is found in their respective ores. Process flow sheet for recovery of precious metals from PCBs of discarded mobile phones suggests dismantling of waste mobile phones followed by separation and classification of components. Selective leaching of Gold (Au) is followed by leaching of Palladium (Pd) and Silver (Ag). Present paper focuses on the recovery of Palladium from leach liquor generated by the dissolution of leached residue obtained after gold extraction. Systematic solvent extraction studies were carried out for extraction of Palladium from model leach liquor (similar to the original leach liquor) using LIX-84 IC. Different parameters like pH, concentration of organic, organic to aqueous ratio etc. were varied to see their effect on the extraction of palladium. Loading capacity of the organic was also determined. Mc-Cabe Thiele plot was drawn to know the number of stages required for complete extraction. Similarly logD versus pH curve was plotted to know the amount of extractant required to extract the targeted metal. Scrubbing of the loaded organic was carried out using sulfuric acid to remove co-extracted copper. Stripping of the loaded organic was carried out using hydrochloric acid. Around 99% extraction of Palladium was observed at optimized parameters. The data generated will be used to scale up the process for commercial exploitation.
机译：贵金属广泛用于电子设备，因为它们具有独特的高导电性，能够承受低安培电流，高灵敏度和耐腐蚀性的能力。在快速技术进步需求中，对最新电子小工具的需求正在增加。过时和死的电子商品导致产生大量的电子废物。为了满足电子设备的需求越来越大，在经济上耗尽和处理电子废物负担的传统储备，有必要回收和开发电子废物作为贵金属的替代资源。在废物电气和电子设备（WEEE）中，丢弃移动电话的印刷电路板（PCB）是针对性的。这些PCB由于其高含量的金（350ppm），银（1380ppm）和钯（210ppm）高出约10-100倍，而不是其各自的矿石的含量高约10-100倍。从丢弃的移动电话的PCB恢复贵金属的过程流程表表明废物手机的拆卸，然后分离和分类。黄金（AU）的选择性浸出之后是钯（Pd）和银（Ag）浸出。本文侧重于通过在金提取后得到的浸出残余物溶解产生的浸出液中的钯。使用LiX-84 IC从模型浸出液（类似于原始浸出液）的钯进行系统溶剂提取研究。不同的参数，如pH值，有机浓度，有机物与水性比例等，以看出它们对钯提取的影响。还测定了有机物的装载能力。绘制MC-CABE Thiele Plot以了解完全提取所需的阶段数。类似地，LOGD与pH曲线绘制以了解提取目标金属所需的萃取剂的量。使用硫酸进行负载有机的擦洗以除去共萃取的铜。使用盐酸进行负载有机的汽提。在优化的参数下观察到大约99％的钯提取。生成的数据将用于扩展商业剥削的过程。

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