Copper recovery from waste printed circuit boards concentrated metal scraps by electrolysis

Selective Recovery of Copper from Industrial Sludge by Integrated Sulfuric Leaching and Electrodeposition

“…No variation of the Fe concentration was observed in the electrolyte while the amount of Cu ion reduced to 37-54% in the process (Figure 4b). lease hydrogen gas (hydrogen evolution reaction-HER) or the deposition of other metals than Cu [15,20]. Therefore, if the current density exceeds a certain high value, a relatively minor amount of electrical current is used to reduce Cu 2+ ions from the solution, which leads to the decrease of Cu recovery efficiency and waste of supplied energy.…”

“…The electrochemical recovery of Cu is generally employed in two stages: (i) Anodic generation of oxidizing agents or direct electro-oxidation to dissolve the metal from the solid sample (electro-leaching stage) and (ii) selective cathodic reduction of dissolved metal ions in the leach liquor to promote its separation from other impurities (electro-winning stage) [15,19]. In the leaching stage, the oxidants (Cl 2 or O 2 ) can be produced by reactions on the anode in chloride aqueous media to promote the dissolution of Cu otherwise the solid sample containing copper is used as the anode material to be dissolved into the electrolyte by the effect of an electric current [16,17,20]. In the separation stage, Cu ions are electrolytically deposited on the surface of a cathode leaving the impurities in the leach liquor [21][22][23][24].…”

“…Other processes could anodically dissolve Cu-metal from the concentrated PCBs powder placed in a stainless steel basket as the anode into the solution of CuSO 4 40.0 g/L and H 2 SO 4 180.0 g/L, while the Cu ion was simultaneously reduced and deposited on the cathode with 96% recovery efficiency at 40 • C, after 15 h [25]. Similarly, an investigation on using the waste PCBs powder as the anode material presented the direct electro-leaching of Cu in the electrolyte containing CuSO 4 •5H 2 O 40.0 g/L, NaCl 40.0 g/L, and H 2 SO 4 118.0 g/L at a current density of 80 mA/cm 2 , and performed a potential recovery of 97.32% Cu with high purity of 99.86% [20]. Interestingly, the electric field has been employed in bioleaching of Cu from PCBs to enhance the functional bacterial, and the results show that the 40 mA electric current application could decrease the leaching time from 5 to 3 days simultaneously with the electrodeposition of Cu on the cathode (97% within 4 days) [26].…”

A novel indole-based conjugated microporous polymer for highly effective removal of heavy metals from aqueous solution via double cation–π interactions

“…18,19 Developing novel efficient, economical, green and environment-friendly adsorbents for heavy metal ions has been considered as an effective way to mitigate the deterioration of the environment. [20][21][22][23] Conjugated microporous polymers (CMPs) have many specic features such as large surface area, high porosity, adjustable pore size, thermal and chemical stability, showing great advantage in removal of heavy metals. [24][25][26] However, the inherent physisorptive metal-adsorption mechanism makes them inevitably suffer from low adsorption capacity and efficiency hence severely hampers their practical applications.…”

Recovery of basic valuable metals and alloys from E-waste using microwave heating followed by leaching and cementation process

“…So, they suggested pyrometallurgical processes which are economical and eco-efficient for the recovery of precious metals from e-wastes, but however hazardous flue emissions need to be minimized from environmental pollution. Liu and his team recovered the copper with waste printed circuit boards with electrolysis process but more researches are required for industrial application [17]. In recent times, scan of literature reveals that researchers achieved a success on e-waste with the applications of bio-leaching.…”