Keywords: Waste printed circuit board Metal

ds ( process, waste PCBs were pre-treated by SCW, then the separated solid phase product with concentrated able materials such as metals (Yazici et al., 2010). Currently, metallurgical techniques, including pyrometallurgi-cal process (Lee et al., 2007; Moltó et al., 2011) and hydrometallur-gical process (Oishi et al., 2007; Jha et al., 2012; Tuncuk et al., 2012) are the two traditional approaches for the recovery of metals from waste PCBs. Hydrometallurgical processes with relatively low Recently, supercritical water (SCW) technique has been widely applied to the decomposition process of stable toxic organic wastes (O’Brien et al., 2005). At supercritical conditions (T> 374 C, P> 22.1 MPa), organic compounds and water form a single and homogeneous phase, which allows reaction to proceed rapidly by an elimination of the potential interface mass transport limitations (Modell, 1989; Shaw et al., 1991). At present, there are two main SCW processes used for the treatment of waste PCBs (Chie