I haven’t understand your question...are you referring about geopolymer technology? Because if it is, the reaction is different. Metakaolin is the aluminum silicate that reacts with alkali silicates (sodium, potassium mainly) with user friendly molar ratio (in order to avoid corrosive pH , that is harmful for users and isn’t necessary to obtain a very good geopolymer product) till complete dissolution (very fluid resin). Then you add slag to accelerate setting time at room temperature, because of CaO content that permits to speed up geopolymerization process. Isn’t true the contrary so metakaolin can’t accelerate slag . But if you are speaking about alkali activation reactions , process is completely different and also stability and performances.