采用CaSO_4·2H_2O为活化剂,粉磨2.0h的铁尾矿粉具有火山灰活性.当其掺量为0.5%时,7d、28d活性指数与抗折强度比为最大,最大程度激发了铁尾矿粉的胶凝活性.并采用红外光谱法与微量热法研究了活化机理,研究结论表明:在化学-机械耦合作用下,铁尾矿粉中无序物质增多;而且该铁尾矿粉的掺加促进了水泥铝相的二次水化,显著提高了胶凝活性. When CaSO_4 · 2H_2O was used as activator, the iron tailings with 2.0 h of grinding activity had pozzolanic activity, and when the content was 0.5%, the activity index and the flexural strength ratio were the maximum at 7d and 28d, The gelation mechanism was studied by infrared spectroscopy and microcalorimetry. The results show that there is an increase of disordered species in the iron-tailings under chemical-mechanical coupling, Plus promote the second hydration of cement aluminum phase, significantly increased the gelling activity.