| In the present work,calcination and sinterability of mixed Mg（OH）2-magnesite and Ca（OH）2-magnesite powders were investigated by using magnesite and CaO（Chemical agent）as staring materials,and characterized by means XRD,TG-DSC,FSEM and FactSage thermodynamic simulation.The results show that:"Decomposition-carbonization-decarbonization" reactions of Mg（OH）2 in the Mg（OH）2-MgCO3 powders and Ca（OH）2 in the Ca（OH）2-MgCO3 powders during calcinations is proved most important to prevent MgO in calcined powder from agglomerating and to improve sinterability of the calcined powders.High homogeneous particle structure in calcined Mg（OH）2-MgCO3 and Ca（OH）2-MgCO3 powders were achieved and high density of 3.08g/cm3 and 3.34g/cm3 were reached in MgO and MgO-CaO clinkers,including 20% MgO and 30% CaO in starting materials,respectively,after sintering at 1650℃×3h in the present work.Grinding treatment of the calcined Mg（OH）2-MgCO3 and Ca（OH）2-MgCO3 powders improved sinterability of both calcined powders.Bulk density of the MgO and MgO-CaO clinkers,which calcined powders including 20% MgO and 30% CaO in starting materials were ball milled for 30 min.,reached 3.16 g/cm3 and 3.40 g/cm3 respectively after sintering at 1650 ℃ for 3h. |
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