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Combining Multiple Methods for Recycling of Kish Graphite from Steelmaking Slags and Oil Sorption Performance of Kish-Based Expanded Graphite

[Image: see text] The utilization of industrial waste as renewable resources is an essential issue of sustainable development. Kish graphite is a precipitate of excess carbon generated during the cooling of molten iron and one of the byproducts associated with steel slags. The scale-up recycling of...

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Autores principales: Li, Jihui, Liu, Ruochen, Ma, Liqiang, Wei, Lubin, Cao, Lili, Shen, Wanci, Kang, Feiyu, Huang, Zheng-Hong
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2021
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8047742/
https://www.ncbi.nlm.nih.gov/pubmed/33869967
http://dx.doi.org/10.1021/acsomega.1c00591
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author Li, Jihui
Liu, Ruochen
Ma, Liqiang
Wei, Lubin
Cao, Lili
Shen, Wanci
Kang, Feiyu
Huang, Zheng-Hong
author_facet Li, Jihui
Liu, Ruochen
Ma, Liqiang
Wei, Lubin
Cao, Lili
Shen, Wanci
Kang, Feiyu
Huang, Zheng-Hong
author_sort Li, Jihui
collection PubMed
description [Image: see text] The utilization of industrial waste as renewable resources is an essential issue of sustainable development. Kish graphite is a precipitate of excess carbon generated during the cooling of molten iron and one of the byproducts associated with steel slags. The scale-up recycling of kish graphite from steelmaking slags is a promising way to develop natural graphite alternatives. However, only one means cannot work efficiently because of the unusual occurrence of associated impurities; combining multiple separation methods is the solution. In this paper, we proposed an integrated beneficiation process, pneumatic separation–flotation–sonication–magnetic separation, to recycle kish graphite flakes with a high graphitization degree and investigated the sorption performance of various oils on kish-based expanded graphite. The new process avoided shortages such as the sediments of iron particles in the flotation cell and the loss of clean graphite in the magnetic separation. Consequently, the carbon content of kish graphite reached ∼95% after separation and >99% after acid leaching. The macroscopic structural defects of kish particles created more active sites, made the intercalation of KG-GICs faster, and yielded better-staged compounds. The kish graphite-based expanded graphite presented an octopus-like shape and exhibited an expansion volume of ∼150 mL/g. Furthermore, the developed macropore structure of the obtained kish graphite-based expanded graphite led to a superior sorption performance for oils. This work supplies one feasible and promising way to recycle kish graphite from steelmaking slags and use it.
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spelling pubmed-80477422021-04-16 Combining Multiple Methods for Recycling of Kish Graphite from Steelmaking Slags and Oil Sorption Performance of Kish-Based Expanded Graphite Li, Jihui Liu, Ruochen Ma, Liqiang Wei, Lubin Cao, Lili Shen, Wanci Kang, Feiyu Huang, Zheng-Hong ACS Omega [Image: see text] The utilization of industrial waste as renewable resources is an essential issue of sustainable development. Kish graphite is a precipitate of excess carbon generated during the cooling of molten iron and one of the byproducts associated with steel slags. The scale-up recycling of kish graphite from steelmaking slags is a promising way to develop natural graphite alternatives. However, only one means cannot work efficiently because of the unusual occurrence of associated impurities; combining multiple separation methods is the solution. In this paper, we proposed an integrated beneficiation process, pneumatic separation–flotation–sonication–magnetic separation, to recycle kish graphite flakes with a high graphitization degree and investigated the sorption performance of various oils on kish-based expanded graphite. The new process avoided shortages such as the sediments of iron particles in the flotation cell and the loss of clean graphite in the magnetic separation. Consequently, the carbon content of kish graphite reached ∼95% after separation and >99% after acid leaching. The macroscopic structural defects of kish particles created more active sites, made the intercalation of KG-GICs faster, and yielded better-staged compounds. The kish graphite-based expanded graphite presented an octopus-like shape and exhibited an expansion volume of ∼150 mL/g. Furthermore, the developed macropore structure of the obtained kish graphite-based expanded graphite led to a superior sorption performance for oils. This work supplies one feasible and promising way to recycle kish graphite from steelmaking slags and use it. American Chemical Society 2021-04-02 /pmc/articles/PMC8047742/ /pubmed/33869967 http://dx.doi.org/10.1021/acsomega.1c00591 Text en © 2021 The Authors. Published by American Chemical Society Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Li, Jihui
Liu, Ruochen
Ma, Liqiang
Wei, Lubin
Cao, Lili
Shen, Wanci
Kang, Feiyu
Huang, Zheng-Hong
Combining Multiple Methods for Recycling of Kish Graphite from Steelmaking Slags and Oil Sorption Performance of Kish-Based Expanded Graphite
title Combining Multiple Methods for Recycling of Kish Graphite from Steelmaking Slags and Oil Sorption Performance of Kish-Based Expanded Graphite
title_full Combining Multiple Methods for Recycling of Kish Graphite from Steelmaking Slags and Oil Sorption Performance of Kish-Based Expanded Graphite
title_fullStr Combining Multiple Methods for Recycling of Kish Graphite from Steelmaking Slags and Oil Sorption Performance of Kish-Based Expanded Graphite
title_full_unstemmed Combining Multiple Methods for Recycling of Kish Graphite from Steelmaking Slags and Oil Sorption Performance of Kish-Based Expanded Graphite
title_short Combining Multiple Methods for Recycling of Kish Graphite from Steelmaking Slags and Oil Sorption Performance of Kish-Based Expanded Graphite
title_sort combining multiple methods for recycling of kish graphite from steelmaking slags and oil sorption performance of kish-based expanded graphite
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8047742/
https://www.ncbi.nlm.nih.gov/pubmed/33869967
http://dx.doi.org/10.1021/acsomega.1c00591
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