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- Title
Cyclic utilization of waste aluminum polishing solution by an efficient co-extraction system: Influence factors and extraction mechanism.
- Authors
Chen, Hui; Li, Shixin; Li, Yingna; Du, Ziqian; Bin, Liying; Li, Weidong; Fu, Fenglian; Li, Ping; Tang, Bing
- Abstract
For the purpose of regenerating waste aluminum polishing solution and eliminating its potential threats to environmental safety, this work focuses on establishing a highly effective co-extraction system for the simultaneous recovery of H 3 PO 4 and H 2 SO 4 from this kind of hazardous wastes, and further reveals the main influence factors and extraction mechanisms. Through a series of screening experiments, a co-extraction system including tributyl phosphate and 1-butanol was successfully established, and the experimental results verified the suitability of this system for the regeneration of most H 3 PO 4 and H 2 SO 4 from waste aluminum polishing solution. The McCabe-Thiele diagram was used to determine that the whole extraction process was a counter-current process of 4-stage extraction and 2-stage stripping, which was capable of recovering most of H 3 PO 4 and H 2 SO 4. The main influence factors include phase ratio, temperature, and contact time, which have different degrees of influence on the recovery efficiency. The co-extraction mechanism of H 3 PO 4 and H 2 SO 4 has also been confirmed by the methods of FTIR, 1H NMR, 17O NMR and 31P NMR.
- Subjects
WASTE recycling; COUNTERCURRENT processes; ALUMINUM; HAZARDOUS wastes; TRIBUTYL phosphate; BUTANOL; HAZARDOUS waste management
- Publication
Process Safety & Environmental Protection: Transactions of the Institution of Chemical Engineers Part B, 2023, Vol 178, p663
- ISSN
0957-5820
- Publication type
Article
- DOI
10.1016/j.psep.2023.08.050