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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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 Mg 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. 2+

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: 10 Apr 2021 22:27