This invention discloses a method for thermal activation of
coal gangue. Using
coal gangue and an activating admixture as raw materials, the method involves sequential crushing, mixing and mechanical activation, homogenization, molding,
drying,
calcination and thermal activation, cooling, and
grinding to prepare active
powder. This invention uses
coal gangue as the main
raw material. By adding an activating admixture, the thermal
activation temperature of the
coal gangue is reduced to below 1000℃, significantly stimulating its activity. Simultaneously, combined with mechanical activation, unsaturated residual bonds are formed in the
quartz minerals within the
coal gangue, producing active silica, further stimulating the activity of the
coal gangue and increasing its activation rate. The prepared active
powder exhibits a
pozzolanic activity of over 75%, achieving the goal of "
waste treatment" and reducing costs. This active
powder can be directly added as a mineral admixture during concrete preparation, showing promising application prospects.