Publications by authors named "Huiwei Weng"
Critical water system used for decomposition and debromination of waste printed circuit board (PCBs) has two disadvantages: low value-added oil phase products and halfway debromination at low temperature condition. In this study, critical water-alcohol composite medium was found to be a promising method to surmount these disadvantages. Critical water-ethanol (CWE) and critical water-methanol (CWM) were selected as the composite medium.
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- * Two rounds of nitric acid treatment recover tin (Sn) and lead (Pb), and the high concentration of copper ions from the second leaching is processed with SCM.
- * The quality of the copper particles improves after removing iron impurities, and factors like temperature and initial copper ion concentration affect particle size and uniformity, making the process a practical method for recycling valuable materials from waste PCBs.
Article Synopsis
- A new method for reusing waste printed circuit boards (PCBs) as flame retardants and smoke suppressants in poly (vinyl chloride) (PVC) was tested using supercritical water oxidation (SCWO).
- The study revealed that the effectiveness of SCWO-treated PCBs relied on the conversion of copper elements during treatment, with key active components being Cu2O, CuO, and SnO2.
- After optimizing the SCWO conditions, the treated PCBs significantly enhanced flame resistance and reduced smoke production in PVC, while also affecting its mechanical properties based on the amount of treated PCBs added.