Pseudoternary system calcium oxide-monocalcium aluminate(CaO.Al2O3)-dicalcium ferrite(2CaO.Fe2O3)

Abstract

The system CaO-CaO·AhOa-2CaO·F e2 0 a is of importance to portla nd cement chemistry beca use it provides in for mation o n the composi tio n of t he iron-bea rin g phase in cem ent cli nker. Iron-bearin g soli d solutio ns in the syste m were found to exi st as a continuo us na rrow band ex t endin g from 2CaO ·F e, Oa to 6.45CaO·2.3 1AI, Oa· F ,0 3' Addi t ional t ie lin es were esta b-lish ed to show t he composition of the iron-bea rin g solid solu t ion phase (F ss) a nd li q uid phases d urin g the co urse of crystalli zation of m ixtures wi t hin the system. I so th erms have b een located for t he regio ns of p rin'cipal in terest. Compatibility relat io ns differ somewh at from t hose repo rted by previoLls investigators. The composit ion of t he iron-bearin g phase in eq uil ibrium \\'it h CaO a nd 3CaO·AI20 a at t he t ern a ry in va ri a n t point proy ed to be lower in F e,Oa t ha n t hat reported by Swa. vze. Other res ult s a re in ge neral ag ree ment wi t h the work of Swayze a nd of Yamauc hi .