Recovery of ultrafine copper particles from metal components of waste printed circuit boards

A novel recovery method of copper from waste printed circuit boards by supercritical methanol process: Preparation of ultrafine copper materials

“…It is a promising strategy for improving the additional value of copper products obtained from waste PCBs. The proposed methods include chemical reduction (Yang et al, 2012), cementation (Fouad and Abdel Basir, 2005), electrochemical process (Chu et al, 2015), and electrokinetic process Zhang, 2009, 2012). In the proposed processes, additional chemical reagents such as surfactant, reductant, and stabilizer must be used.…”

Micro-copper powders recovered from waste printed circuit boards by electrolysis

“…In recent years, many researchers have investigated a number of approaches on copper recovery from WPCBs, including pyrometallurgical process (Cui and Zhang, 2008;Duan et al, 2012;Li et al, 2010), hydrometallurgical process (Kim et al, 2011a,b;Park and Fray, 2009;Syed, 2012;Tuncuk et al, 2012;Yang et al, 2012;Zhu et al, 2009), bioleaching process (Zhu et al, 2011), supercritical water oxidation process (Xiu and Zhang, 2010) and mechanical process (Havlik et al, 2014;Zhang and Forssberg, 1997). In China, mechanical process is the first choice and has been widely and successfully applied in industry, because it can recycle copper without consuming a great amount of energy when compared to pyrometallurgical process, and it also would not consume leaching agents and produce secondary waste water when compared to hydrometallurgical process (Havlik et al, 2014).…”

Selective recovery of palladium from waste printed circuit boards by a novel non-acid process

“…However, most of those studies focused on the recovery of copper, silver, gold and other base metals [2,[8][9][10][11][12][13][14][15][16]. Very few researches have been carried out on the recovery of palladium [6,[17][18][19].…”