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- Title
Recycling of Zinc and Iron from Smelting Waste Containing Zinc Ferrite via Sulfating Roasting Using SO<sub>2</sub>: Transformation Effects and Mechanisms.
- Authors
Li, Yan-Chun; Zhao, Fei-Ping; Liu, Hui; Peng, Bing; Min, Xiao-Bo; Lin, Zhang
- Abstract
It is critical to recycle valuable elements such as zinc and iron from smelting waste containing zinc ferrite because of the resource crisis and environmental sustainability. Sulfating roasting followed by water leaching has been considered a promising approach. In this study, a novel sulfating roasting method using SO2 has been developed to treat zinc ferrite for the efficient separation of zinc and iron. Moreover, the conversion mechanism of zinc ferrite and SO2 was investigated in detail. The results showed that the transformation rate of zinc ferrite reached 95.47% at 600°C for 30 min under SO2/SO2 + O2 of 60% (v/v). The mechanism studies revealed that O in SO2 combined with the O vacancy of Zn A - site 2 + - O - Fe B - site 3 + , while the S in SO2 combined with the Fe B - site 3 + of Zn A - site 2 + - O - Fe B - site 3 + for electron migration. S (IV) was oxidized to S (VI) while Fe3+ was reduced to Fe2+. Importantly, zinc ferrite transformed into zinc-deficient magnetite intermediate ( Zn 2 + (Fe 2 +) A - site - O - Fe 3 + (Fe 2 +) B - site ) via reduction of Fe3+ and migration of Fe2+. The transformation of zinc ferrite was a catalyst-free redox reaction. This study provided a new insight into the utilization of smelting waste and a theoretical basis for the efficient separation of zinc and iron from smelting waste containing zinc ferrite.
- Subjects
ZINC ferrites; SMELTING; ZINC; IRON; FERRITES; OXIDATION-reduction reaction; SUSTAINABILITY; WASTE recycling
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2023, Vol 75, Issue 2, p268
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-022-05601-9