Electroleaching and electrodeposition of zinc in a single-cell process for the treatment of solid waste

Size-controlled preparation of Cu2O nanoparticles from waste printed circuit boards by supercritical water combined with electrokinetic process

“…The concentration of copper ion in cathodic bath increased with the increase of reaction time during the first 8 h and decreased thereafter. In such a three-compartment EK system, a higher concentration of metal ion in cathode compartment could allow a higher reaction rate [36], which may result in the increase of agglomeration of Cu 2 O nanoparticles.…”

Recovery of copper and lead from waste printed circuit boards by supercritical water oxidation combined with electrokinetic process

“…5). In such three-compartment EK system, a higher metal ion concentration in cathode compartment could allow a higher amount of deposited metal, with higher current efficiency [22].…”

“…The method uses direct current as the "cleaning agent", combining the electrokinetic movement of ions in the matrix. Recently, some researchers [14][15][16][17][18][19][20][21] reported the use of such techniques for metal recovery or removal from solid wastes, and more lately, Guillaume et al [22] reported an effective EK process which combines electroleaching and electrodeposition in a single-cell to recover zinc from some zinc-rich solid wastes, without transportation of solids or fluids from one chamber to another by pumps or other mechanical processes, and the principle of which has been well described. This achievement induced us to test the process for the treatment of SCWO-treated PCBs particles, and evaluate the feasibility of the application of such process to recover or remove metallic elements from waste PCBs that contain large numbers of Cu and Pb. In this study, we attempted to develop a highly efficient and benign process for copper and lead recovery from waste PCBs.…”

The recovery of zinc from hot galvanizing slag in an anion-exchange membrane electrolysis reactor

“…Usually, sulfuric acid [2][3][4][5][6], hydrochloric acid, acetic acid [2] ammonia/ammonium carbonate, ammonium chloride [7,8] and carboxylic acid are used as leaching medium for the dissolution of zinc [2]. The metal from the leaching solution is recovered by different methods such as precipitation [2][3][4], crystallization [2,3], solvent extraction [9], ion exchange [10] and electrowinning [10][11][12][13].…”