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铁尾矿在蒸压养护过程中的物相变化

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Abstract:

以铁矿尾矿替代河砂或者粉煤灰作为主要原料,铝粉作为发气剂,研究制备出了蒸压加气混凝土砌块。在铁矿尾矿、石灰、水泥和脱硫石膏的配合比(质量比)为6025105时,加气混凝土砌块的强度最优,约为4.43MPa,此时体积密度为513kg/m3,比强度为8.34MPa。由X射线衍射测试分析可知,成品中主要的矿物成分为托贝莫来石,此外还有石膏和尾矿中残留的石英等。扫描电镜结果显示,成品中形成了一种呈扭曲状态的针状或板状的结晶相。29Si和27Al的核磁共振分析表明,在前期养护温度为70℃时,尾矿中部分石英和富钙的长石颗粒分解,其它大多数的含铁相矿物在180℃的蒸压合成反应下才得以分解。新形成的针状或板状的物相,包括托贝莫来石,都是具有呈扭曲状态的富铁的水化铝硅酸盐类矿物。

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