From hazardous waste to fertilizer: Recovery of high-value metals from smelter slags
Authors:
- Katarzyna Mikula,
- Dawid Skrzypczak,
- Grzegorz Izydorczyk,
- Sylwia Baśladyńska,
- Konrad Szustakiewicz,
- Katarzyna Gorazda,
- Konstantinos Moustakas,
- Katarzyna Chojnacka,
- Anna Witek-Krowiak
Abstract
This work proposes a method to valorize lead slag for fertilizer purposes. The research concept was to selectively recover valuable microelements (Cu(II), Fe(II), Zn(II) in an amount of at least 0.2% m/v of each) by chemical leaching while retaining toxic elements in the slag (i.e. As and Pb). Among acids, hydroxides, salts and their mixtures tested for slag treatment, it was potassium hydrogen sulfate and ammonia liquor under strongly oxidizing conditions (in the presence of hydrogen peroxide) that proved to be the most effective leaching agents. Response Surface Methodology applied to optimize the slag leaching conditions set the most favorable process parameters (concentration of leaching agents, slag to reagent weight ratio, and temperature). As a result, the concentration of Cu(II) in the extract was 3751 mg/L (for ammonia liquor) and Fe(II) and Zn(II) concentrations in potassium hydrogen sulfate were 4738 mg/L and 6102 mg/L, respectively. To close the life cycle of the waste, immobilization in polyethylene and binding to cement were indicated as methods to manage the solid waste material after leaching. The mixed extracts rich in Cu(II), Fe(II) and Zn(II) ions were tested in germination tests on cucumber. No phytotoxic effect was observed, which raises the possibility of utilizing the solutions after chemical leaching of slag as an alternative source of micronutrients for the production of multicomponent fertilizers. The results are promising and fit in the assumptions of circular economy.
- Record ID
- CUT4736df7d2fe14ac58ffa6f9a038d170f
- Publication categories
- ;
- Author
- Journal series
- Chemosphere, ISSN 0045-6535, e-ISSN 1879-1298, Biweekly
- Issue year
- 2022
- Vol
- 297
- Pages
- [1-8]
- Article number
- 134226
- Other elements of collation
- schem.; tab.; Bibliografia (na s.) - 7-8; Oznaczenie streszczenia - Abstr.; Numeracja w czasopiśmie - Vol. 297
- Substantive notes
- Part of special issue: Mining of resources from solid waste employing advance treatment technologies
- Supplementary data can be found online at https://doi. org/10.1016/j.chemosphere.2022.134226
- Keywords in English
- circular economy, fertilizer, microelements, recovery, slag, valorization
- ASJC Classification
- ; ;
- DOI
- DOI:10.1016/j.chemosphere.2022.134226 Opening in a new tab
- URL
- https://www.sciencedirect.com/science/article/abs/pii/S0045653522007196 Opening in a new tab
- Related project
- Opracowanie technologii odzysku metali z żużli z hutnictwa rud miedzi i wykorzystanie ich w produkcji nawozów wzbogaconych mikroelementami, zgodnie z założeniami gospodarki o obiegu zamkniętym. . Project leader at PK: , ,
- Language
- eng (en) English
- Score (nominal)
- 140
- Score source
- journalList
- Score
- Publication indicators
- Additional fields
- Indeksowana w: Web of Science, Scopus
- Uniform Resource Identifier
- https://cris.pk.edu.pl/info/article/CUT4736df7d2fe14ac58ffa6f9a038d170f/
- URN
urn:pkr-prod:CUT4736df7d2fe14ac58ffa6f9a038d170f
* presented citation count is obtained through Internet information analysis, and it is close to the number calculated by the Publish or PerishOpening in a new tab system.