烧结烟气脱硫灰用作矿渣水泥缓凝剂的研究

Study on desulfurized ash of sintering flue gas as BF slag cement retarder

烧结烟气脱硫灰是采用半干法对烧结烟气脱硫处理后的副产品,其主要成分是CaSO3·1/2H2O。介绍了烧结烟气脱硫灰用作矿渣水泥缓凝剂的实验研究,通过将脱硫灰与天然石膏按不同比例配合后掺入矿渣水泥进行实验。结果表明:脱硫灰能延长矿渣水泥的凝结时间,对矿渣水泥的胶砂力学强度具有一定的激发作用;当脱硫灰与天然石膏配比为1∶1,在矿渣水泥中的总掺入量为4%时,激发效果最好;采用脱硫灰作缓凝剂生产的矿渣水泥的各项性能均达到国标要求。

Sintering flue gas desulfurized ash is the residues of semi-dry sintering flue gas desulfurization process, in which the main component is CaSO3·1/2H2O. The experiment of mixing sintering flue gas desulfurized ash and natural limestone at different proportion to act as slag cement retarder was introduced. The results show as follows： desulfurized ash can prolong the setting time of BF slag cement and morover it has some excitation effect for the strength of BF slag cement, and when the proportion is 1 ： 1 and the adding rate of retarder in BF slag cement is 4%, the excitation effect become the best, and the performance index of the produced BF slag cement reaches the national stardard.