The invention discloses a method for preparing a pozzolanic mixed material through two-step activation of
illite shale, and belongs to the technical field of building materials. The method comprises the following steps: 1)
drying illite shale to remove physical adsorption water; (2)
grinding to specified
fineness; 3) carrying out thermal activation treatment at the temperature of 600-1000 DEG C; and 4) carrying out mechanochemical activation on the thermally activated material, so that the
particle size distribution of the product meets the conditions that D50 is 2-10 [mu] m and D90 is 10-30 [mu] m, and the specific surface area is 1000-1600 m / kg. Aiming at the characteristic of stable structure of
illite shale, high-temperature thermal activation and mechanochemical activation of specific equipment are coupled to cooperatively destroy the
crystal structure of illite, so that the
amorphous phase content of the product is more than or equal to 40%, and the 28d
activity index is more than or equal to 80%. Compared with single mechanical activation, the method has the advantages that the mechanical activation time is greatly shortened, the
system power consumption is greatly reduced, large-scale production is facilitated, the prepared pozzolanic mixed material can replace 30-40% of
cement clinker, and a new path is provided for carbon emission reduction in the
cement industry.