Characterization of MgO Calcined from Mg(OH)2 Produced from Reject Brine

Dong, H., Unluer, C. , Al-Tabbaa, A. and Yang, E.H. (2016) Characterization of MgO Calcined from Mg(OH)2 Produced from Reject Brine. In: 4th International Conference on Sustainable Construction Materials and Technologies, Las Vegas, United States, 7-11 Aug 2016,

Abstract

© 2016 International Committee of the SCMT conferences. All rights reserved. Reactive magnesia (MgO) has received attention as a cement binder due to the lower calcination temperatures used during its production and its ability to absorb and store CO2 permanently. While a majority of the MgO is produced from the calcination of magnesium carbonate, an alternative route involves its extraction from reject brine, a concentrated by-product obtained from treating brackish water or seawater in desalination plants. Brine is preferred for the recovery of MgO due to its local global abundance and its high Mg2+ content. The proposed process involves the synthesis of Mg(OH)2 from waste brine collected from a desalination plant via the addition of different amounts of aqueous ammonia (NH3H2O). The results include the determination of an optimum amount of NH3H2Ofor a high reaction rate, leading to the synthesis of a high amount of pure Mg(OH)2. The obtained Mg(OH)2 was then calcined to produce MgO at different temperatures (500-700°C) and durations (2-48 hours). The morphologies of the synthesized Mg(OH)2 plates and MgO particles produced under a range of conditions were investigated in detail, indicating the feasibility of MgO production from waste brine and highlighting the factors influencing the properties of the final product.

• Item Type: Conference Proceedings
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Unluer, Dr Cise
• Authors: Dong, H., Unluer, C., Al-Tabbaa, A., and Yang, E.H.
• College/School: College of Science and Engineering > School of Engineering > Infrastructure and Environment
• ISSN: 2515-3048

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