Influencing Parameters on the Sintering Process of Steel Slag-based Ceramics for High-temperature Thermal Energy Storage

Kholoud M. Al Naimi, Jean Francois Hoffmann, Khalid Al Ali, Nicolas Calvet

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

This paper presents an innovative approach of utilizing electric arc furnace (EAF) slags in value-added applications, particularly as storage media for high-temperature thermal energy storage (TES) systems, applied to next-generation of central receiver concentrated solar power (CSP) plants. EAF slag is a solid industrial waste produced in large quantities in metallurgy worldwide and commonly sent to dump sites. Due to steel slag’s chemical composition of metal and non-metal oxides, advanced ceramic bodies can be prepared using thermally treated EAF slag powder. The crystallographic stability of oxidized EAF slag powder was confirmed by XRD analysis that revealed the absence of any crystal phase transformation at elevated temperatures up to 1200 ÛC. Advanced ceramic entirely recycled from locally UAE produced EAF slag was prepared following the method of cold compaction of ceramic powder. For sensible heat TES materials, a high density is desired to maximize the storage capacity. Therefore, the final product bulk density was examined by studying the influence of parameters such as (i) the applied compaction pressure, (ii) the firing temperature, (iii) the binder weight percentage, and (iv) the firing time. Findings showed that a compaction pressure of 186 MPa resulted in relatively dense green ceramic bodies. The firing of these bodies at 1200 ÛC with a dwell time of 3 hours resulted in ceramic products with a bulk density in the range of 2500 kg/m3 that could be potentially used as TES media.

Original languageBritish English
Title of host publicationSOLARPACES 2019
Subtitle of host publicationInternational Conference on Concentrating Solar Power and Chemical Energy Systems
EditorsChristoph Richter
ISBN (Electronic)9780735440371
DOIs
StatePublished - 11 Dec 2020
Event2019 International Conference on Concentrating Solar Power and Chemical Energy Systems, SolarPACES 2019 - Daegu, Korea, Republic of
Duration: 1 Oct 20194 Oct 2019

Publication series

NameAIP Conference Proceedings
Volume2303
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference2019 International Conference on Concentrating Solar Power and Chemical Energy Systems, SolarPACES 2019
Country/TerritoryKorea, Republic of
CityDaegu
Period1/10/194/10/19

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