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Mineralogy and crystal chemistry of calcium aluminate cement
Calcium aluminate cements (CAC) are mainly made for bauxites and limestone with additional other raw materials and can be subdivided in three main groups depending on their chemical composition. The manufacture is mainly carried out by fusion or rotary kiln process. Calcium aluminate cements are composed mainly of monocalcium aluminate, with other calcium aluminates, calcium disilicate, tetracalcium aluminiumferrite, gehlenite, plechroite and some minor phases wich sometimes can have a strong influence on hydration behavior. The mineralogical compositions and phasedevelopment between refractory cements and CACs used in the building industry are different. All phases occuring in calcium aluminate cements are able to participate in solid solutions. Due to the kiln atmosphere, reduction of iron to its lower oxidation state, Fe(II), can take place. Calcium aluminate cements are mainly used in refractory industry and building industry but also have other applications for environmental controls or fertilizer formulation. The typical phases from raw meal to finished calcium aluminate cement will be discussed, the crystallography is shown and their solid solutions are explained. The development and application of the Rietveld method for quantification of the mineralogical composition for calcium aluminium cements is given.
Mineralogy and crystal chemistry of calcium aluminate cement
Calcium aluminate cements (CAC) are mainly made for bauxites and limestone with additional other raw materials and can be subdivided in three main groups depending on their chemical composition. The manufacture is mainly carried out by fusion or rotary kiln process. Calcium aluminate cements are composed mainly of monocalcium aluminate, with other calcium aluminates, calcium disilicate, tetracalcium aluminiumferrite, gehlenite, plechroite and some minor phases wich sometimes can have a strong influence on hydration behavior. The mineralogical compositions and phasedevelopment between refractory cements and CACs used in the building industry are different. All phases occuring in calcium aluminate cements are able to participate in solid solutions. Due to the kiln atmosphere, reduction of iron to its lower oxidation state, Fe(II), can take place. Calcium aluminate cements are mainly used in refractory industry and building industry but also have other applications for environmental controls or fertilizer formulation. The typical phases from raw meal to finished calcium aluminate cement will be discussed, the crystallography is shown and their solid solutions are explained. The development and application of the Rietveld method for quantification of the mineralogical composition for calcium aluminium cements is given.
Mineralogy and crystal chemistry of calcium aluminate cement
Mineralogie und Kristallchemie von Calciumaluminatzement
Pollmann, H. (author)
2001
41 Seiten, 27 Bilder, 9 Tabellen, 208 Quellen
Conference paper
English
Mineralogy and Crystal Chemistry of Calcium Aluminate Cement
| British Library Conference Proceedings | 2001
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