Abstract
Metal lead was first prepared from waste lead paste by direct electrochemical reduction in NH3-NH4Cl solution. Cyclic voltammetry of waste lead paste powders indicated that waste lead paste could be directly electrochemically reduced to metal lead. After constant cell voltage electrolysis for 3 h, waste lead paste pellets were almost completely converted into metal containing 98.3% lead, and the current efficiency and energy consumption were approximately 86.3% and 689.4 kW h/t, respectively. In addition, an empirical model of direct electrochemical reduction of waste lead paste pellets in NH3-NH4Cl solution has been proposed. Metal lead was initially formed at a three-phase interface of the current collector, waste lead paste and electrolyte; then, the newly formed three-phase interface of the metal lead, waste lead paste and electrolyte quickly expanded along the surface of the pellets and eventually extended into the interior of the pellets.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
