B₂O₃ content in sintered magnesium oxide obtained from seawater

Abstract

The effect of TiO₂ concentration (1, 2, and 5 mass %) on the reduction of B₂O₃ content has been studied during isothermal and activated sintering of seawater-derived magnesium oxide at 1550, 1650 and 1750<span style="mso-bidi-font-family: " times="" new="" roman""="" lang="EN-GB">°C for 1, 3 and 5 h. Magnesium oxide is obtained from seawater by precipitation with 80% and 120% of the stoichiometric quantity of the dolomite lime as the precipitation agent. The results indicate that the addition of TiO₂ has a significant effect and it also greatly affects the evaporation of B₂O₃. The thermodynamic analysis of experimental results, based on Onsager phenomenological postulates, has established the relations of mutual influence of simultaneous irreversible processes, i.e. reactions of the formation of Ca₂B₂O₅ and CaTiO₃, during isothermal and activated sintering of seawater-derived magnesium oxide.

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