分别以轻烧氧化镁、氢氧化镁、碱式碳酸镁为镁源,以三水铝石和无定形二氧化硅为铝源和硅源,按堇青石的理论组成配制成3种不同的混合料,经0、1、3、10、20、40 h机械活化后,在1 200、1 250、1 300、1 350℃空气气氛中煅烧3h合成堇青石,用XRD分析机械活化前后物料的物相组成和结晶度以及合成产物的相组成.研究结果表明:1)以轻烧氧化镁为镁源的物料经40 h机械活化后仍未完全无定形化,而以氢氧化镁或碱式碳酸镁为镁源的物料经20或10 h机械活化后就完全无定形化;2)机械活化对3种物料的堇青石初始生成温度影响不大,在1 350℃煅烧3h后,未机械活化的3种物料均未完全生成堇青石,而机械活化一定时间后的3种物料均形成了纯相堇青石,表明机械活化降低了堇青石的完全生成温度.
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