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It has been found that the mechanical activation of mixtures of sillimanite   group minerals with talc and silica additives in grinding-activating devices   with periodic and flow action provides significant acceleration of their   interaction with formation of cordierite at the subsequent high-temperature   treatment. It is shown that the output of cordierite depends on nature of   mineral: in mixture with a sillimanite it is considerably higher, than with   an andalusite and kyanite, while the rate of mullitization of these minerals   has opposite character. It means that the formation of mullite during heat   treatment is not a limiting step in synthesis of cordierite. It is shown that   the rate of reaction is determined by the difference in the acid-base   properties of these minerals, which depend on the coordination of aluminum   cations by oxygen ions, different for each of the modifications

Role of acid-base interactions in synthesis of cordierite from talc and sillimanite group minerals