Recovery of reactive MgO from reject brine via the addition of NaOH
View / Open Files
Authors
Dong, H
Unluer, C
Yang, EH
Al-Tabbaa, Abir
Publication Date
2018-03-01Journal Title
Desalination
ISSN
0011-9164
Publisher
Elsevier
Volume
429
Pages
88-95
Type
Article
This Version
VoR
Metadata
Show full item recordCitation
Dong, H., Unluer, C., Yang, E., & Al-Tabbaa, A. (2018). Recovery of reactive MgO from reject brine via the addition of NaOH. Desalination, 429 88-95. https://doi.org/10.1016/j.desal.2017.12.021
Abstract
© 2017 Elsevier B.V. Reject brine, generated as a waste at the end of the desalination process, presents a useful source for the extraction of valuable resources. This study investigated the recovery of reactive MgO from reject brine obtained from a local desalination plant. This was enabled via the reaction of Mg2 + present within reject brine with an alkali source (NaOH), which led to the precipitation of Mg(OH)2, along with a small amount of CaCO3. The determination of the optimum NaOH/Mg2 + ratio led to the production of the highest amount of yield. The synthesized Mg(OH)2 was further calcined under a range of temperatures (500–700 °C) and durations (2 − 12h) to produce reactive MgO. A detailed characterization of MgO obtained under these conditions was presented in terms of its reactivity, specific surface area (SSA), composition and microstructure. While an increase in the calcination temperature and duration decreased the reactivity and SSA of MgO, samples calcined at 500 °C for 2 h revealed the highest reactivity, which was reflected by their SSA of 51.4 m2/g.
Keywords
Reject brine, Reactive MgO, NaOH, Mg(OH)2, Calcination
Sponsorship
This project is funded by the National Research Foundation (NRF), Prime Minister's Office, Singapore under its Campus for Research Excellence and Technological Enterprise (CREATE) program.
Funder references
Engineering and Physical Sciences Research Council (EP/M003159/1)
Identifiers
External DOI: https://doi.org/10.1016/j.desal.2017.12.021
This record's URL: https://www.repository.cam.ac.uk/handle/1810/291062
Rights
Licence:
http://creativecommons.org/licenses/by-nc-nd/4.0/
Statistics
Total file downloads (since January 2020). For more information on metrics see the
IRUS guide.