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Pyrolysis Behaviors and Residue Properties of Iron-Rich Rolling Sludge from Steel Smelting

Iron-rich rolling sludge (FeRS) represents a kind of typical solid waste produced in the iron and steel industry, containing a certain amount of oil and large amounts of iron-dominant minerals. Pyrolysis under anaerobic environment can effectively eliminate organics at high temperatures without oxid...

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Autores principales: Ye, Hengdi, Li, Qian, Yu, Hongdi, Xiang, Li, Wei, Jinchao, Lin, Fawei
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8871665/
https://www.ncbi.nlm.nih.gov/pubmed/35206336
http://dx.doi.org/10.3390/ijerph19042152
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author Ye, Hengdi
Li, Qian
Yu, Hongdi
Xiang, Li
Wei, Jinchao
Lin, Fawei
author_facet Ye, Hengdi
Li, Qian
Yu, Hongdi
Xiang, Li
Wei, Jinchao
Lin, Fawei
author_sort Ye, Hengdi
collection PubMed
description Iron-rich rolling sludge (FeRS) represents a kind of typical solid waste produced in the iron and steel industry, containing a certain amount of oil and large amounts of iron-dominant minerals. Pyrolysis under anaerobic environment can effectively eliminate organics at high temperatures without oxidation of Fe. This paper firstly investigated comprehensively the pyrolysis characteristics of FeRS. The degradation of organics in FeRS mainly occurred before 400 °C. The activation energy for pyrolysis of FeRS was extremely low, ca. 5.44 kJ/mol. The effects of pyrolytic temperature, atmosphere, heating rate, and stirring on pyrolysis characteristics were conducted. Commonly, the yield of solid residues maintained around 85 wt.%, with approximately 13 wt.% oil and 2 wt.% gas. Due to the low yield of oil and gas, their further utilization remains difficult despite CO(2) introduction which could upgrade their quality. The solid residues after pyrolysis exhibited porous properties with co-existence of micropores and mesopores. Combined with the high content of zero-valent iron, magnetic property, hydrophobic characteristic, and low density, the solid residues could be further utilized for water pollution control and soil remediation. Moreover, the solid residues were suitable for sintering to recover valuable iron resources. However, the solid residues also contained certain heavy metals, such as Cd, Cr, Cu, Ni, Pb, and Zn, which might cause secondary pollution during their utilization. In particular, the toxic Cr possessed high content, which should be treated with detoxification and removal. This paper provides fundamental information for pyrolysis of FeRS and utilization of solid residues.
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spelling pubmed-88716652022-02-25 Pyrolysis Behaviors and Residue Properties of Iron-Rich Rolling Sludge from Steel Smelting Ye, Hengdi Li, Qian Yu, Hongdi Xiang, Li Wei, Jinchao Lin, Fawei Int J Environ Res Public Health Article Iron-rich rolling sludge (FeRS) represents a kind of typical solid waste produced in the iron and steel industry, containing a certain amount of oil and large amounts of iron-dominant minerals. Pyrolysis under anaerobic environment can effectively eliminate organics at high temperatures without oxidation of Fe. This paper firstly investigated comprehensively the pyrolysis characteristics of FeRS. The degradation of organics in FeRS mainly occurred before 400 °C. The activation energy for pyrolysis of FeRS was extremely low, ca. 5.44 kJ/mol. The effects of pyrolytic temperature, atmosphere, heating rate, and stirring on pyrolysis characteristics were conducted. Commonly, the yield of solid residues maintained around 85 wt.%, with approximately 13 wt.% oil and 2 wt.% gas. Due to the low yield of oil and gas, their further utilization remains difficult despite CO(2) introduction which could upgrade their quality. The solid residues after pyrolysis exhibited porous properties with co-existence of micropores and mesopores. Combined with the high content of zero-valent iron, magnetic property, hydrophobic characteristic, and low density, the solid residues could be further utilized for water pollution control and soil remediation. Moreover, the solid residues were suitable for sintering to recover valuable iron resources. However, the solid residues also contained certain heavy metals, such as Cd, Cr, Cu, Ni, Pb, and Zn, which might cause secondary pollution during their utilization. In particular, the toxic Cr possessed high content, which should be treated with detoxification and removal. This paper provides fundamental information for pyrolysis of FeRS and utilization of solid residues. MDPI 2022-02-14 /pmc/articles/PMC8871665/ /pubmed/35206336 http://dx.doi.org/10.3390/ijerph19042152 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Ye, Hengdi
Li, Qian
Yu, Hongdi
Xiang, Li
Wei, Jinchao
Lin, Fawei
Pyrolysis Behaviors and Residue Properties of Iron-Rich Rolling Sludge from Steel Smelting
title Pyrolysis Behaviors and Residue Properties of Iron-Rich Rolling Sludge from Steel Smelting
title_full Pyrolysis Behaviors and Residue Properties of Iron-Rich Rolling Sludge from Steel Smelting
title_fullStr Pyrolysis Behaviors and Residue Properties of Iron-Rich Rolling Sludge from Steel Smelting
title_full_unstemmed Pyrolysis Behaviors and Residue Properties of Iron-Rich Rolling Sludge from Steel Smelting
title_short Pyrolysis Behaviors and Residue Properties of Iron-Rich Rolling Sludge from Steel Smelting
title_sort pyrolysis behaviors and residue properties of iron-rich rolling sludge from steel smelting
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8871665/
https://www.ncbi.nlm.nih.gov/pubmed/35206336
http://dx.doi.org/10.3390/ijerph19042152
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