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.
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Acknowledgements
This study was financially supported by the National Natural Science Foundation of China (Grant Numbers U1760120, 51504059); the National Key R&D Program of China (Grant Numbers 2017YFC0210403-04, 2017YFC0210404); the Fundamental Research Funds for the Central Universities (Grant Numbers N162504016, N182504018); the Fund of Liaoning S&T Project (Grant Number 20180551008).
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Fan, Y., Liu, Y., Niu, L. et al. Preparation of Metal Lead from Waste Lead Paste by Direct Electrochemical Reduction in NH3-NH4Cl Solution. JOM 71, 4518–4527 (2019). https://doi.org/10.1007/s11837-019-03797-x
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DOI: https://doi.org/10.1007/s11837-019-03797-x