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Towards Circular Economy for Steel - Assessing the Efficiency of Yellow Gypsum Synthesis from BOF Slags / THOMAS HARPER

Swansea University Author: THOMAS HARPER

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Abstract

The large quantities of basic oxygen furnace (BOF) slag produced at the Tata Steel Port Talbot steelworks has no existing recycling scope and has formed a large legacy “slag mountain” over the years. Closure of all Britain’s coal power plants by 2025 potentially could create a shortage of the supply...

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Published: Swansea 2021
Institution: Swansea University
Degree level: Master of Research
Degree name: MSc by Research
URI: https://cronfa.swan.ac.uk/Record/cronfa59456
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first_indexed 2022-02-25T14:21:52Z
last_indexed 2022-02-26T04:26:13Z
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spelling 2022-02-25T15:05:01.6926954 v2 59456 2022-02-25 Towards Circular Economy for Steel - Assessing the Efficiency of Yellow Gypsum Synthesis from BOF Slags b486f5c35e0a729056ef92a1d9277c5c THOMAS HARPER THOMAS HARPER true false 2022-02-25 The large quantities of basic oxygen furnace (BOF) slag produced at the Tata Steel Port Talbot steelworks has no existing recycling scope and has formed a large legacy “slag mountain” over the years. Closure of all Britain’s coal power plants by 2025 potentially could create a shortage of the supply of gypsum in the UK and elsewhere. A solution to the problem may lie in production of gypsum from a by-product of the steelmaking. This will afford a potential opportunity for commercialisation in Port Talbot. This research applies the findings of ‘A method of producing calcium sulphate from LD slag waste produced during the recovery of metallic iron from LD slag’ of which patent 572/KOL/2014 has been filed, to assess the efficiency of yellow gypsum synthesis from BOF slag, while determining the feasibility for commercialisation of this process at the Port Talbot steelworks. To provide this knowledge, an assessment of the chemical composition and particle size distribution of the BOF slag produced at the Port Talbot steelworks was undertaken, whilst developing methods to assess the efficiency of the process. X-ray fluorescence analysis was undertaken on the BOF slag samples acquired and synthetic yellow gypsum produced to determine the calcium conversion at the defined particle size distributions outlined in the thesis. Cost and market analysis were also undertaken to determine feasibility of commercialisation at the Port Talbot steelworks. This study, therefore confirmed that commercialisation of this process in the Port Talbot steelworks is feasible but would require large scale operation and further processing of the synthetic yellow gypsum produced. In addition, processing the synthetic yellow gypsum produced to products within the agriculture and construction industry would provide a higher valued final product. E-Thesis Swansea Yellow Gypsum Synthesis, Basic Oxygen Furnace, Slag, Circular Economy, Patent 572/KOL/2014 3 12 2021 2021-12-03 A selection of third party content is redacted or is partially redacted from this thesis due to copyright restrictions. COLLEGE NANME COLLEGE CODE Swansea University Master of Research MSc by Research Mabbett, Ian ; Charles, Rhys 2022-02-25T15:05:01.6926954 2022-02-25T14:18:42.7705028 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised THOMAS HARPER 1 59456__22459__c96fd6f8c3f84a06a44d645465625442.pdf Harper_Thomas_E_MSc_Research_Thesis_Final_Redacted.pdf 2022-02-25T14:58:47.7135588 Output 6314214 application/pdf Redacted version - open access true Copyright: The author, Thomas E. Harper, 2021. true eng
title Towards Circular Economy for Steel - Assessing the Efficiency of Yellow Gypsum Synthesis from BOF Slags
spellingShingle Towards Circular Economy for Steel - Assessing the Efficiency of Yellow Gypsum Synthesis from BOF Slags
THOMAS HARPER
title_short Towards Circular Economy for Steel - Assessing the Efficiency of Yellow Gypsum Synthesis from BOF Slags
title_full Towards Circular Economy for Steel - Assessing the Efficiency of Yellow Gypsum Synthesis from BOF Slags
title_fullStr Towards Circular Economy for Steel - Assessing the Efficiency of Yellow Gypsum Synthesis from BOF Slags
title_full_unstemmed Towards Circular Economy for Steel - Assessing the Efficiency of Yellow Gypsum Synthesis from BOF Slags
title_sort Towards Circular Economy for Steel - Assessing the Efficiency of Yellow Gypsum Synthesis from BOF Slags
author_id_str_mv b486f5c35e0a729056ef92a1d9277c5c
author_id_fullname_str_mv b486f5c35e0a729056ef92a1d9277c5c_***_THOMAS HARPER
author THOMAS HARPER
author2 THOMAS HARPER
format E-Thesis
publishDate 2021
institution Swansea University
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 - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
document_store_str 1
active_str 0
description The large quantities of basic oxygen furnace (BOF) slag produced at the Tata Steel Port Talbot steelworks has no existing recycling scope and has formed a large legacy “slag mountain” over the years. Closure of all Britain’s coal power plants by 2025 potentially could create a shortage of the supply of gypsum in the UK and elsewhere. A solution to the problem may lie in production of gypsum from a by-product of the steelmaking. This will afford a potential opportunity for commercialisation in Port Talbot. This research applies the findings of ‘A method of producing calcium sulphate from LD slag waste produced during the recovery of metallic iron from LD slag’ of which patent 572/KOL/2014 has been filed, to assess the efficiency of yellow gypsum synthesis from BOF slag, while determining the feasibility for commercialisation of this process at the Port Talbot steelworks. To provide this knowledge, an assessment of the chemical composition and particle size distribution of the BOF slag produced at the Port Talbot steelworks was undertaken, whilst developing methods to assess the efficiency of the process. X-ray fluorescence analysis was undertaken on the BOF slag samples acquired and synthetic yellow gypsum produced to determine the calcium conversion at the defined particle size distributions outlined in the thesis. Cost and market analysis were also undertaken to determine feasibility of commercialisation at the Port Talbot steelworks. This study, therefore confirmed that commercialisation of this process in the Port Talbot steelworks is feasible but would require large scale operation and further processing of the synthetic yellow gypsum produced. In addition, processing the synthetic yellow gypsum produced to products within the agriculture and construction industry would provide a higher valued final product.
published_date 2021-12-03T04:16:47Z
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score 11.014067

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