Zinc oxide in cement clinkering: part 1. Systems CaO—ZnO—Al2O3 and CaO—ZnO—Fe2O3

Abstract

The systems CaO—ZnO—Al2O3 and (C—Z—A) and CaO—ZnO—Fe2O3 (C—Z—F) have been studied and their phase relationships established. Two hitherto unreported phases, Ca3ZnAl4O10 (C3ZA2) and Ca6Zn3A14O15 (C6Z3A2) were characterized in the system C—Z—A: their X ray diffraction patterns were obtained and indexed. No new phases were discovered in the system C—Z—F Phase coexistence has been established in both systems. C6Z3A2 is of particular interest to clinkering because it coexists with alite, belite and a c~lnker liqUid phase: This. is confirmed both by laboratory experiment and its identification in white and grey clinkers, made from industrial raw meals doped with 1·0 and 2·0 wt% of zinc oxide.