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The chemical reactions necessary for manufacturing cement clinker are complex and not entirely understood in detail.The possibility to make experimental measurements in Portland cement manufacture is limited and therefore detailed knowledge of the processes taking place in the rotary kiln is difficult.In the last years there have been great advances in computational thermodynamics and developed both software and thermodynamic databases that allow a large numbe1 of calculations and in this way contribute to a better understanding of the process occurring in the rotary kiln without need of experimental measurements.The aim of this research is to use the software FactSage with the database FT-Oxid for calculations to enable further understanding of the clinker manufacturing process.