Optimized Iodine Recovery from Zinc Suboxide Derived from Steel Dust Using Alkaline Washing and Air Blowing-Out: A Sustainable Industrial Approach

Lin Lin, Senlin Tian (), Jie Zhao, Dong Wang, Kai Li and Ping Ning ()
Additional contact information
Lin Lin: Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
Senlin Tian: Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
Jie Zhao: Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
Dong Wang: Greennovo Environmental Technology Co., Ltd., Gejiu 661011, China
Kai Li: Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
Ping Ning: Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China

Sustainability, 2024, vol. 16, issue 24, 1-13

Abstract: The present paper proposes an advanced process to effectively recover and fully use iodine from steel dust-derived zinc suboxide, with considerations of effectiveness in the process and industrial viability. It includes, for example, alkali wash for the dissolution of iodine into an alkaline solution from steel dust and uses mechanical vapor recompression (MVR) to concentrate the dissolved iodine by preparing the solution for the air-blowing-out process. The hydrogen iodide is also oxidized under acidic conditions with the addition of hydrogen peroxide to form crude iodine, estimated at about 20 tons annually. As a matter of fact, using this process, up to 1.2 million tons of steel waste dust can be treated in a year, turning what was previously considered waste into something of value. The thermodynamic relationship between iodine recovery and pH value is further discussed in this study, pointing out that under alkaline conditions, iodine is predominantly in the form of iodide (I − ) and iodate (IO 3 − ), while at less than pH 2.8, it is in its molecular form I 2 . These insights would provide a theoretical backbone for maximum extraction efficiency, guiding process parameters toward optimum recovery and judicious use of the resource.

Keywords: steel dust; iodine recovery; blowing-out process; thermodynamics (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2024
References: View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/2071-1050/16/24/10925/pdf (application/pdf)
https://www.mdpi.com/2071-1050/16/24/10925/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jsusta:v:16:y:2024:i:24:p:10925-:d:1542842

Access Statistics for this article

Sustainability is currently edited by Ms. Alexandra Wu

More articles in Sustainability from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().