Abstract
AbstractThe reaction of kaolinite with potassium hydroxide (1 to 9N) was investigated between 70 and 90°C. During a first period of the reaction the content of Si and Al in solution increased and reached a maximum in 100 to 240 minutes, depending on KOH concentration and temperature; then an amorphous aluminosilicate gel formed. After an induction period, again depending on KOH concentration and temperature, the concentrations of Si and Al decreased rapidly, due to the formation of a crystalline potassium aluminosilicate.
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