CUED Publications database

Characterization of MgO calcined from Mg(OH)2 produced from reject brine

Dong, H and Unluer, C and Al-Tabbaa, A and Yang, EH (2016) Characterization of MgO calcined from Mg(OH)2 produced from reject brine. In: UNSPECIFIED.

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© 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 or Workshop Item (UNSPECIFIED)
Divisions: Div D > Geotechnical and Environmental
Depositing User: Cron Job
Date Deposited: 09 Aug 2018 01:26
Last Modified: 18 Aug 2020 12:47