Production of reactive magnesia from desalination reject brine and its use as a binder

Ruan, S., Yang, E.-H. and Unluer, C. (2021) Production of reactive magnesia from desalination reject brine and its use as a binder. Journal of CO2 Utilization, 44, 101383. (doi: 10.1016/j.jcou.2020.101383)

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Abstract

This study investigated the feasibility of producing reactive MgO cement from reject brine obtained from a desalination plant and evaluated its use as a binder in comparison to a commercial MgO. The mechanical performance of the samples cured under carbonation conditions for up to 28 days were further supported by x-ray diffraction (XRD), thermogravimetric analysis/differential scanning calorimetry (TGA/DSC) and field emission scanning electron microscopy (FESEM) analyses. Samples involving synthetic MgO revealed higher strengths than those with commercial MgO, in line with the higher reactivity of the former. The increased dissolution of synthetic MgO led to its enhanced hydration and carbonation, resulting in samples with denser structures and improved performances. The findings highlighted issues regarding the large-scale production of MgO from reject brine and CO2 emissions of this process. The major environmental impact was associated with the production of the alkali base (NaOH), which could be improved via the identification of sustainable alkali sources used during production. Overall, the production of MgO from reject brine can save natural resources and pave the way for the sequestration of CO2 as stable carbonates in cement-based mixes.

Item Type:Articles
Additional Information:The authors would like to thank Mr Fanxi Sun for his help with the experimental work. The authors also acknowledge the financial support from the Singapore MOE Academic Research Fund Tier 1 (RG 95/16) for the completion of this research project.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Unluer, Dr Cise
Creator Roles:
Unluer, C.Conceptualization, Funding acquisition, Methodology, Project administration, Resources, Supervision, Writing – original draft, Writing – review and editing
Authors: Ruan, S., Yang, E.-H., and Unluer, C.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Journal of CO2 Utilization
Publisher:Elsevier
ISSN:2212-9820
ISSN (Online):2212-9839
Published Online:04 December 2020
Copyright Holders:Copyright © 2020 IEEE
First Published:First published in Journal of CO2 Utilization 44:101383
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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