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题名: Direct extraction of palladium and silver from waste printed circuit boards powder by supercritical fluids oxidation-extraction process
作者: Liu, Kang; Zhang, Zhiyuan; Zhang, Fu-Shen
刊名: JOURNAL OF HAZARDOUS MATERIALS
出版日期: 2016-11-15
卷号: 318, 页码:216-223
关键词: Precious metals ; Waste printed circuit boards ; Supercritical water oxidation ; Supercritical fluid extraction ; Recovery
DOI: 10.1016/j.jhazmat.2016.07.005
部门归属: 固体废弃物处理与资源化实验室
英文摘要: The current study was carried out to develop an environmental benign process for direct recovery of palladium (Pd) and silver (Ag) from waste printed circuit boards (PCBs) powder. The process ingeniously combined supercritical water oxidation (SCWO) and supercritical carbon dioxide (Sc-CO2) extraction techniques. SCWO treatment could effectively enrich Pd and Ag by degrading non-metallic component, and a precious metal concentrate (PMC) could be obtained, in which the enrichment factors of Pd and Ag reached 5.3 and 4.8, respectively. In the second stage, more than 93.7% Pd and 96.4% Ag could be extracted from PMC by Sc-CO2 modified with acetone and KI-I2 under optimum conditions. Mechanism study indicated that Pd and Ag extraction by Sc-CO2 was a complicated physiochemical process, involving oxidation, complexation, anion exchange, mass transfer and migration approaches. Accordingly, this study established a benign and effective process for selective recovery of dispersal precious metals from waste materials. (C) 2016 Elsevier B.V. All rights reserved.
收录类别: SCI
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内容类型: 期刊论文
URI标识: http://ir.rcees.ac.cn/handle/311016/35776
Appears in Collections:固体废弃物处理与资源化实验室_期刊论文

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