CAJ | 학술논문

为了探究高铝粉煤灰在碱溶液中的反应规律，利用XRD和SEM等手段分析了山西某地高铝粉煤灰与氢氧化钠溶液反应前后的结构演变及行为。研究结果表明：高铝粉煤灰主要由莫来石、石英和玻璃态物质组成，其元素分布弥散。在120℃的氢氧化钠溶液中，玻璃态物质能被较快分解，而莫来石与石英溶解缓慢，并生成铝酸钠与硅酸钠，二者进一步生成钠硅渣。180℃下添加石灰时，氢氧化钠溶液浓度不低于30 g／L时才能有效分解莫来石与石英，形成铝雪硅钙石和铝酸钠。
위료탐구고려분매회재감용액중적반응규률，이용XRD화SEM등수단분석료산서모지고려분매회여경양화납용액반응전후적결구연변급행위。연구결과표명：고려분매회주요유막래석、석영화파리태물질조성，기원소분포미산。재120℃적경양화납용액중，파리태물질능피교쾌분해，이막래석여석영용해완만，병생성려산납여규산납，이자진일보생성납규사。180℃하첨가석회시，경양화납용액농도불저우30 g／L시재능유효분해막래석여석영，형성려설규개석화려산납。
In order to explore reaction rule of coal fly ash ( CFA ) in alkali solution, the structure evolvement and behavior of CFA from Shanxi Province before and after its reaction with sodium hydroxide solution were analyzed by X?ray diffraction ( XRD) and scanning electron microscope ( SEM) . The results showed that the compositions of CFA are predominantly mullite, quartz and vitreous phase matter, with elements dispersed. The vitreous phase matter can be easily decomposed in sodium hydroxide solution at a temperature of 120 ℃, while the mullite and quartz are dissolved slowly to form sodium silicate and sodium aluminate, which then turned to be sodalite. Furthermore, mullite and quartz can be decomposed with sodium hydroxide solution (ρ(Na2O)≥30 g/L) by adding lime at a temperature of 180 ℃, resulting in products of aluminum tobermorite and sodium aluminate.