The change of particle size and disorder of illite by treatment with 4 N hydrochloric acid was examined by X-ray diffraction method. The value of particle size of the original specimen is obtained as 89 A, and it changes to 53 A after treatment for 9 hours. Disorder also seems to decrease with increasing duration of treatment.
The change of activation energy and order of reaction was studied by the Freeman and Carroll's method. The value of activation energy of the untreated specimen is 30.7 kcal/mole and it decreases to 22.9 kcal/mole, when treated for 9 hours. Order of reaction is 1 for all the specimens.
The results obtained in this work seem to show that the mechanism of the acid dissolution is complicated complex of homogeneous and heterogeneous processes.
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