期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 318, 期 -, 页码 216-223出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2016.07.005
关键词
Precious metals; Waste printed circuit boards; Supercritical water oxidation; Supercritical fluid extraction; Recovery
资金
- National Natural Science Foundation of China [21477151, 51278485]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB05050200]
- National Water Pollution Control and Management Program [2012ZX07202-005]
- Science Promotion Program of Research Center for Eco-Environmental Sciences, CAS [YSW2013B05]
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.
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