Production of mono-anorthite phase through mechanical activation

The structures of kaolinite, calcite and corundum were strongly deteriorated with activating the mixture with high energy planetary mono mill. Anorthite formation kinetics of activated and non-activated mixtures were studied by Differential Thermal Analysis under a heating rate of 5–30 °C, using Kissenger plots. The crystallization of anorthite showed an activation energy of 325 kJ mol−1 for mechanically activated and of 475 kJ mol−1 for non-activated samples. Both specimens crystallized by bulk nucleation. The phase formations were investigated upon heating at 1000–1100–1200–1300 °C. The structure of anorthite, for activated samples, was almost restored after firing at a temperature as low as 1100 °C for which the non-activated samples had to be fired at 1200 °C.