1. Characterization of Fe-based sediments received from chemical pre-treatment of hydrometallurgical waste leachate from the recycling of alkaline batteries.
- Author
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Yang, Zhendong, Karczewska-Golec, Joanna, Styczynski, Michal, Bajda, Tomasz, and Drewniak, Lukasz
- Subjects
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ALKALINE batteries , *LEACHATE , *WASTE treatment , *FERROUS sulfate , *CHEMICAL reagents , *ARSENIC removal (Water purification) , *LEAD removal (Sewage purification) - Abstract
The waste leachate from the hydrometallurgical recycling of spent batteries contains a significant amount of undesirable iron that needs to be precipitated before the recovery of target metals. The produced Fe-sediments are usually disposed of or stored at the treatment site as waste and are often poorly managed. This work estimates the environmental stability and application potential of Fe-sediments produced from highly acidic hydrometallurgical leachate during the recycling of spent alkaline batteries. After pH neutralization of the leachate by Na 2 CO 3 , a primary Fe-sediment (PFS), mainly composed of highly unstable metal (i.e., Fe, Zn, and Mn) sulfates, was obtained. The subsequent rinsing of this unstable PFS sediment led to the production of a secondary Fe-sediment (SFS), which was composed of an amorphous-phased ferric iron sulfate hydrate – Fe 16 O 16 (SO 4) 3 (OH) 10 ·10H 2 O. The results of single extraction using chemical reagents and biological dissolution by iron-transforming bacteria confirmed that despite most of the ions in PFS were dissolvable, the processed SFS was environmentally safe. The sorption efficiency of SFS towards Pb(II) and As(V) (up to ~ 99% and 94%, respectively, with an initial concentration of 100 mg/L) was found to be promising, suggesting the high potential for economical reuse of SFS. ga1 • Fe removal from the leachate of alkaline batteries recycling results in the precipitation of Zn and Mn. • Secondary Fe-sediments have much higher chemical and biological stability than primary ones. • Secondary Fe-sediments are an effective sorbent for lead and arsenic. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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