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Microwave treatment of a hot mill sludge from the steel industry: en route to recycling an industrial waste

Virginia Gomez Orcid Logo, Kourtney Wright, Gibran L. Esquenazi, Andrew Barron Orcid Logo

Journal of Cleaner Production, Volume: 207, Pages: 182 - 189

Swansea University Authors: Virginia Gomez Orcid Logo, Andrew Barron Orcid Logo

Abstract

Oily hot rolling mill (HRM) sludge containing a high percentage of iron oxides has been treated under microwave irradiation, and the products compared to hexane washed and thermal treated sludges. Metals present in the sludge act as a highly microwave-absorbent material, creating hot spots that trig...

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Published in: Journal of Cleaner Production
ISSN: 09596526
Published: 2019
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URI: https://cronfa.swan.ac.uk/Record/cronfa44637
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first_indexed 2018-09-27T13:00:13Z
last_indexed 2018-11-19T20:21:44Z
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spelling 2018-11-19T15:43:46.8880158 v2 44637 2018-09-27 Microwave treatment of a hot mill sludge from the steel industry: en route to recycling an industrial waste 2b0a7a13d79d306b3e0be7d30df54844 0000-0002-7846-9066 Virginia Gomez Virginia Gomez true false 92e452f20936d688d36f91c78574241d 0000-0002-2018-8288 Andrew Barron Andrew Barron true false 2018-09-27 EEN Oily hot rolling mill (HRM) sludge containing a high percentage of iron oxides has been treated under microwave irradiation, and the products compared to hexane washed and thermal treated sludges. Metals present in the sludge act as a highly microwave-absorbent material, creating hot spots that trigger the stripping of the water and oils under air. The sludge looses 5 wt% of water and volatiles under 5 min of microwave irradiation (1000 W at 2450 MHz), which represents a similar reduction in weight as 4 h heating at 200 °C, but with savings in energy and time. Most importantly, after microwave irradiation, the material also shows an improvement in its rheological properties (free flowing and smaller particle size) and changes in its chemical composition. Microwaved samples are less oxidized than heated ones (lower Fe3+ content), which is an advantage recycling the sludge as a source of iron with lower oxidation state necessitates a lower coke:ore ratio for blast furnace operation. Journal Article Journal of Cleaner Production 207 182 189 09596526 Steel, Sludge, Microwave, Iron, Oxide 31 12 2019 2019-12-31 10.1016/j.jclepro.2018.08.294 COLLEGE NANME Engineering COLLEGE CODE EEN Swansea University 2018-11-19T15:43:46.8880158 2018-09-27T09:53:39.2630317 Faculty of Science and Engineering School of Engineering and Applied Sciences - Chemical Engineering Virginia Gomez 0000-0002-7846-9066 1 Kourtney Wright 2 Gibran L. Esquenazi 3 Andrew Barron 0000-0002-2018-8288 4 0044637-27092018100154.pdf gomez2018.pdf 2018-09-27T10:01:54.5930000 Output 3032628 application/pdf Accepted Manuscript true 2019-09-21T00:00:00.0000000 true eng
title Microwave treatment of a hot mill sludge from the steel industry: en route to recycling an industrial waste
spellingShingle Microwave treatment of a hot mill sludge from the steel industry: en route to recycling an industrial waste
Virginia Gomez
Andrew Barron
title_short Microwave treatment of a hot mill sludge from the steel industry: en route to recycling an industrial waste
title_full Microwave treatment of a hot mill sludge from the steel industry: en route to recycling an industrial waste
title_fullStr Microwave treatment of a hot mill sludge from the steel industry: en route to recycling an industrial waste
title_full_unstemmed Microwave treatment of a hot mill sludge from the steel industry: en route to recycling an industrial waste
title_sort Microwave treatment of a hot mill sludge from the steel industry: en route to recycling an industrial waste
author_id_str_mv 2b0a7a13d79d306b3e0be7d30df54844
92e452f20936d688d36f91c78574241d
author_id_fullname_str_mv 2b0a7a13d79d306b3e0be7d30df54844_***_Virginia Gomez
92e452f20936d688d36f91c78574241d_***_Andrew Barron
author Virginia Gomez
Andrew Barron
author2 Virginia Gomez
Kourtney Wright
Gibran L. Esquenazi
Andrew Barron
format Journal article
container_title Journal of Cleaner Production
container_volume 207
container_start_page 182
publishDate 2019
institution Swansea University
issn 09596526
doi_str_mv 10.1016/j.jclepro.2018.08.294
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Chemical Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Chemical Engineering
document_store_str 1
active_str 0
description Oily hot rolling mill (HRM) sludge containing a high percentage of iron oxides has been treated under microwave irradiation, and the products compared to hexane washed and thermal treated sludges. Metals present in the sludge act as a highly microwave-absorbent material, creating hot spots that trigger the stripping of the water and oils under air. The sludge looses 5 wt% of water and volatiles under 5 min of microwave irradiation (1000 W at 2450 MHz), which represents a similar reduction in weight as 4 h heating at 200 °C, but with savings in energy and time. Most importantly, after microwave irradiation, the material also shows an improvement in its rheological properties (free flowing and smaller particle size) and changes in its chemical composition. Microwaved samples are less oxidized than heated ones (lower Fe3+ content), which is an advantage recycling the sludge as a source of iron with lower oxidation state necessitates a lower coke:ore ratio for blast furnace operation.
published_date 2019-12-31T03:53:06Z
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score 10.928009