Synthesis of reactive MgO from reject brine via the addition of NH4OH

Haoliang Dong, C Unluer, En-Hua Yang, Abir Al-Tabbaa

Research output: Contribution to journalArticlepeer-review


Reactive magnesia (MgO) with a high purity and reactivity is used in several high-end applications. This study reports the feasibility of synthesizing high reactivity MgO from reject brine with the use of NH4OH. The molar amount of NH4OH was optimized at a NH4OH/Mg2+ molar ratio of 6 to provide maximum magnesium oxide yield and purity. This led to the synthesis of Mg(OH)2 with a purity of 93.5%, which was further calcined at 500 °C for 2h to produce reactive MgO with a SSA of 78.8 m2/g. This study shed light on the significant potential of reject brine in the recovery of Mg2+ and the synthesis of reactive MgO with a wide range of potential applications.
Original languageEnglish
Pages (from-to)165-172
Number of pages8
Early online date1 Feb 2017
Publication statusPublished - May 2017


  • Mg(OH)(2)
  • MgO
  • microstructure
  • NH4OH
  • reject brine
  • synthesis


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