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化工学报  2014 

钙铝比对11.3CaO·7Al2O3微观结构及其溶出性能的影响

DOI: 10.3969/j.issn.0438-1157.2014.10.057, PP. 4183-4190

Keywords: 烧结,钙铝比,11.3CaO·7Al2O3,显微结构,氧化铝,溶出率

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Abstract:

通过高温烧结法在不同钙铝比(C/A)的条件下合成了铝酸钙熟料。利用XRD对不同C/A下合成产物进行物相分析,对含量进行半定量分析,并计算其晶格常数。采用SEM观察不同C/A下合成产物的显微结构,并通过EDS佐证所得物相;最后研究了不同C/A下氧化铝的溶出性能。结果表明:当C/A2O3和11.3CaO·7Al2O3(C11.3A7),且随着C/A的增大,C11.3A7的含量增高,氧化铝的溶出率提高;当C/A=1.6时得到的产物只有C11.3A7,溶出率达到最大;当C/A>1.6时由于3CaO·Al2O3的形成,溶出率有所降低。C11.3A7晶格中CaO的缺失,促进了溶出反应的进行。

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