Preparation method of superfine fly ash

The invention discloses a preparation method of superfine fly ash, which is characterized by comprising the following steps: respectively drying fly ash and limestone particles at 100-105 DEG C for 2 hours, grinding, sieving with a 200-mesh sieve, proportioning the undersize product of fly ash and the undersize product of limestone according to a calcium-silicon ratio of 1: (1.5-2.5), adding water for forming, calcining at 1250-1350 DEG C for 0.5-2 hours, and cooling to obtain the superfine fly ash. According to the method, interference factors for preventing C2S crystal orientation transformation are effectively eliminated, the self-pulverization rate of the fly ash calcined material can reach 100%, and the average particle size of the self-pulverization material is smaller than 1.0 mu m. 本发明公开的一种超细粉煤灰的制备方法，其特征是将粉煤灰和石灰石碎粒分别在100～105℃烘干2小时，并磨细过200目筛，将粉煤灰的筛下物和石灰石筛下物按照钙硅比为1∶1.5～2.5配料，加水成型，在1250℃～1350℃下煅烧0.5～2小时后冷却后得到超细粉煤灰。本发明有效消除阻止C2S晶向转变的干扰因素，可保证粉煤灰煅烧结料的自粉化率达到100％，自粉化料的平均粒度小于1.0μm。