粉煤灰活化机理及胶凝材料的研究

An Investigation of the Activation Meechanism of Fly Ash and the Cementing Materials

对煤粉增钙燃烧过程中粉煤灰活化机理及活化粉煤灰的特性进行了实验研究，结果表明，通过增钙工艺，高钙煤粉在１２００～１４００℃温度下燃烧，形成含钙量较高的高钙玻璃体，使粉煤灰在高温下活化．活化粉煤灰中主要矿物为β－Ｃ２Ｓ，Ｃ４ＡＦ，Ｃ３Ａ，Ｃ５Ａ３，此外还有Ｃ（１２）Ａ７，Ｃ２Ｆ，ＣａＳＯ４，ＣａＯ及活性ＳｉＯ３等结晶矿物，当活化粉煤灰中ＣａＯ含量在２１％～２５％时，加入适量的强度激发剂并提高磨细度，就可将活化粉煤灰直接转换成３２５＃低能耗的粉煤灰水泥．

the activation mechanism of fly ash during combustion with added calcium of the pulver-ized coal and the characteristics of activated fly ash have been experimentally investigated.The results show that,under laboratory conditions,after adding calcium, high calcium glassand crystallized minerals are formed during combustion at 1200～1400℃. In the mean-time, the pulverized coal is activated and sulphur is effectively separated so that air pollutioncan be reduced.The density of activated fly ash is found to be 2.3～2.6g /cm3 adn its bulkdensity,700～900 kg/cm3, its specific surface 3 000～3500 cm2/g.The chemical compositionof the activated fly ash is mainly SiO2,Al2O3 and CaO that make up over 70%of all partsand the main minerals are β-C2S,C4AF,C3A,C5A3 as well as some crystallized ones such asC(12)A7 ,C2F,CaSO4,CaO and activated α-SiO2.If the content of CaO in activated fly ash reach-es about 21%～25%,with a mixture of suitable amount of strength excimer and proper tech-nology,# 325 cement with properties up to standard can be obtained.