科研之友
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摘要
Electronic-waste recycling has become a global issue owing to its potential environmental pollution and rich metal resource. Waste multilayer ceramic capacitors (MLCCs), widely existing in discarded electronic devices, are rich in valuable metals such as silver (Ag) and palladium (Pd). However, how to effectively and in an environmentally friendly manner recycle waste MLCCs is seldom considered. This study developed an efficient and integrated process for recovering valuable materials from waste MLCCs by chloride metallurgy (CM) and corona electrostatic separation (CES). In CM, NH4Cl was used as the chlorinating agent. The results demonstrated that BaTiO3, Ag, and tin (Sn) can be chlorinated. The generated gas-phase SnCl4 was collected in the condensing zone. BaCl2 and AgCl were sequentially separated by leaching with water and sodium thiosulfate solution. The recovery efficiencies of Ag, Ba, and Sn could reach 99.21, 98.76, and 99.83%, respectively. The optimal CM parameters were considered to be 400 degrees C, 30 min, and NH4Cl/scrap mass ratio of 4:1. Then, the residual Pd and TiO2 were performed by CES. Pd and TiO2 can be well separated under a voltage of 30 kV and a roll speed of 25 rpm. This study contributes to the efficient recycling of valuable resources from waste MLCCs.
- 出版日期2017-9
- 单位上海交通大学
