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化工学报  2015 

Na2O掺杂铝酸钙化合物物相转化与浸出性能

DOI: 10.11949/j.issn.0438-1157.20141264, PP. 1551-1556

Keywords: Na2O掺杂,烧结,铝酸钙,浸取,物相转化

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Abstract:

以分析纯试剂CaCO3、Al2O3和Na2CO3为原料,在1350℃烧结1h合成了Na2O掺杂铝酸钙熟料,并采用XRD、SEM和EDS等方法研究了Na2O掺杂CaO-Al2O3体系铝酸钙化合物的物相演变规律及熟料浸出性能。结果表明:当CaO和Al2O3的摩尔比为1.0时,CaO-Al2O3体系铝酸钙由CaO·Al2O3和12CaO·7Al2O3组成,而Na2O掺杂铝酸钙熟料由CaO·Al2O3、12CaO·7Al2O3、Na2O·Al2O3和Na4Ca3(AlO2)10组成。除形成含Na2O化合物外,熟料中掺杂的Na2O固溶于12CaO·7Al2O3中,而CaO·Al2O3中几乎不含Na2O。随着熟料中Na2O掺杂量的升高,12CaO·7Al2O3和Na4Ca3(AlO2)10的含量逐渐增加,CaO·Al2O3的含量逐渐降低;12CaO·7Al2O3和Na4Ca3(AlO2)10的结晶度逐渐降低,CaO·Al2O3的结晶度逐渐升高。Na2O的掺杂提高了熟料在碳酸钠溶液中的浸出性能,并且使浸出渣中CaCO3的空间群由R-3CH、P63/MMC两种转变为只含有R-3CH一种。

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