烧结干法脱硫灰激发高炉矿粉活性及其机理研究  

Study on BF Slag Modified by Flue Gas Sintering Desulfurization Ash and Its Mechanism

作　　者：杨利香[1,2] YANG Lixiang 1,2(1 Shanghai Research Institute of Building Sciences, Shanghai 201108; 2 Shanghai Engineering Technology Research Center Industrial Solid Waste Utilization, Shanghai 20110)

机构地区：[1]上海市建筑科学研究院,上海201108 [2]上海工业固体废弃物资源化利用工程技术研究中心,上海201108

出　　处：《材料导报》2018年第A01期232-237,共6页Materials Reports

基　　金：上海工业固体废弃物资源化利用工程技术研究中心能力提升项目(15DZ2281700)

摘　　要：针对烧结干法脱硫灰资源化利用和高炉矿粉早期活性不高的问题,采用烧结干法脱硫灰激发高炉矿粉活性,测试了不同烧结干法脱硫灰掺量下高炉矿粉-水泥体系的强度、干缩、浸水自由膨胀性能;采用X射线衍射、扫描电镜、差示扫描量热-热重法研究了烧结干法脱硫灰激发高炉矿粉-水泥体系的水化产物、微观形貌及其火山灰放热行为机理。结果表明,采用烧结干法脱硫灰激发高炉矿粉能显著提高高炉矿粉3d、7d、28d抗压强度,其原因是高炉矿粉在烧结干法脱硫灰形成的SO42-、CO32-、SO32-环境下,生成了3CaO·Al2O3·CaSO4·32H2O、2CaSiO3·CaCO3·CaSO4·15H2O和3CaO·Al2O3·CaSO3·11H2O等水化产物;烧结干法脱硫灰的掺入使得高炉矿粉-水泥体系出现第三个放热峰,虽峰值相差不大,但出现时间明显滞后,有效减缓了高炉矿粉-水泥体系的水化放热。In order to enhance the resource utilization of flue gas sintering desulfurization ash（FGD ash）and the early activity of blast furnace slag,this paper studied the blast furnace slag modified by flue gas desulfurization ash,and the influence of modified blast furnace slag on the strength,dry shrinkage and free expansion in water of cement was investigated.The hydration,micro morphology and volcano ash exothermic mechanism of modified blast furnace slag-cement mortar were analyzed by methods of X-ray diffraction,differential thermal analysis-thermogravimetry（DTA-TG）and scanning electron microscope（SEM）.The results showed that the 3 d,7 d,28 dactivity of modified blast furnace slag-cement mortar was significantly improved,because blast furnace slag produced hydration products such as 3 CaO·Al2 O3 ·CaSO4 ·32 H2 O,2 CaSiO3 ·CaCO3 ·CaSO4 ·15 H2 O,3 CaO·Al2 O3 ·CaSO3·11 H2 O under the circumstance of SO42-,CO32-,SO32-by FGD ash.The hydration heat curve of modified blast furnace slag-cement system showed the 3 rd exothermic peak with the FGD ash mix.Although the peak had little difference from other peaks,the time of the peak apparently lagged behind which slowed down the hydration exothermic rate.

关 键 词：烧结干法脱硫灰 高炉矿粉 差示扫描量热-热重法(DTA-TG) 水化热 机理 

分 类 号：TU526[建筑科学—建筑技术科学]