Journal
JOURNAL OF CLEANER PRODUCTION
Volume 284, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2020.124767
Keywords
Cleaner production; Pollutant reduction; Lead-based anode; Zinc electrowinning; MnO2 pre-coating process; Anode slime
Categories
Funding
- National Major Science and Technology Program for Water Pollution Control and Treatment [2017ZX07402004]
- National Natural Science Foundation of China [41877392]
- Central Level, Scientific Research Institutes for Basic R&D Special Fund Business (Chinese Research Academy of Environmental Sciences) [2019YSKY-005, 2016YSKY034]
- Major Science and Technology Program for Water Pollution Control and Treatment [2018ZX07701001-7]
- Funds of State Key Laboratory for Environmental Criteria and Risk Assessment [SKLECRA201754]
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The study proposed a new functional anode preparation process by rapid electrodeposition of γ-MnO2 on bare lead-based anode, effectively reducing dissolved lead and significantly promoting zinc purity. The MnO2 pre-coating process shows bright prospects for industrial applications in zinc electrowinning and other hydrometallurgy processes.
Lead-based alloy is the most widely used anode material in zinc electrowinning and other metallurgical processes. Lead dissolution during electrowinning not only results in resource loss and pollution generation, but also leads to deteriorations in product quality and adversely effects economic benefits. In this study, we propose a new functional anode preparation process that was precisely and completely fabricated by rapid electrodeposition of an active gamma-MnO2 layer on bare lead-based anode. The prepared anode (MnO2 pre-coated anode [WA]) exhibited an excellent performance in terms of both pollutant reduction and product promotion as compared with the typical bare Pb-1%Ag anode (TPA). Property characterizations and electrochemical analysis indicated that the active gamma-MnO2 layer showed complete and uniform coverage on the lead-based anode, which effectively blocked the contact and reaction of lead with electrolytes. This was beneficial for reducing the amounts of dissolved lead and significantly promoting the purity of zinc. Besides, the needle-like structure and positive electro-catalytical effects of gamma-MnO2 on the oxygen evolution reaction (OER) lowered the anode overpotential, reversely inhibited the Mn2+ oxidation reaction, and reduced 94% of anode slime formation and 94% of lead migration. The MnO2 pre-coating process shows bright prospects for industrial applications in zinc electrowinning and other hydrometallurgy processes. (C) 2020 Elsevier Ltd. All rights reserved.
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