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热处理针铁矿的结构与色度演化

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Abstract:

利用X射线粉末衍射仪、透射电子显微镜、比表面积分析仪、漫反射光谱仪等研究了针铁矿在空气气氛中的热结构演化和色度变化规律,并以红度、黄度、橙度和总反射率表征色度变化。结果表明煅烧温度低于200℃时,针铁矿未发生相变,比表面积约为12.0m2/g,样品颜色为橙黄色,总反射率、红度、橙度、黄度变化不明显;高于200℃时,针铁矿开始转变成赤铁矿,并形成纳米孔结构,比表面积呈现先增加后减小的变化,在250℃达到最大值97.4m2/g,颜色由橙黄色变成赤红色,总反射率、橙度和黄度降低,红度升高;且随着煅烧温度升高,针铁矿相变形成的颗粒内部纳米孔孔径逐渐增大,比表面积急剧减小,煅烧产物的颜色略有变化,总反射率、橙度、黄度和红度变化不明显;当温度大于750℃时,纳米孔消失,温度为900℃时,比表面积降至2.8m2/g,产物颜色从赤红色向暗红色转变,总反射率和红度降低,橙度与黄度未变。

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