氧化镁掺杂对铝酸盐形成和水化的影响  

Effect of Magnesium Oxide Doping on Formation and Hydration of Aluminate

作　　者：宋强[1] 聂娇 陈延信[1] 胡亚茹[1] 邓洋 李辉[1] SONG Qiang;NIE Jiao;CHEN Yanxin;HU Yaru;DENG Yang;LI Hui(College of Materials and Science and Engineering,Xi′an University of Architecture and Technology,Xi'an 710055,China;Shaanxi Fuping Eco-cement CO.,LTD,Weinan 711709,Shaanxi,China)

机构地区：[1]西安建筑科技大学材料科学与工程学院,西安710055 [2]陕西富平生态水泥有限公司,陕西渭南711709

出　　处：《硅酸盐学报》2022年第11期2855-2867,共13页Journal of The Chinese Ceramic Society

基　　金：陕西省科学技术研究计划(2021GY-203,2021TD-53,2022GY-418,2022KXJ-008);陕西省教育厅重点研发计划(20JS079,20JY040)。

摘　　要：为探究方镁石在熟料铝相中的赋存状态,揭示水化反应机制,合成了不同MgO含量的铝酸盐,采用扫描电子显微镜,X射线衍射,红外光谱等,研究了MgO对合成铝酸盐的形成和水化性质的影响。结果表明:提高煅烧温度,增加MgO含量有助于C_(4)AF和C_(12)F_(7)的形成和稳定;含镁铝酸盐熔体发生分相现象,黑色相主要由C_(3)A和MgO组成,玻璃体和黄色相中的MgO含量较低,形成了Ca_(20)Al_(26)Mg_(3)Si_(3)O_(68)和Ca_(7)Mg Al_(10)O_(23)等含镁化合物;MgO掺杂降低了铝酸盐相的水化速率;随着MgO含量增加,铝酸盐相1 d的水化热降低。MgO掺杂的铝酸盐水化产物中存在Mg:Al摩尔比约为2或3的镁铝双金属氢氧化物。To investigate the occurrence of periclase in clinker aluminate and reveal the hydration mechanism,aluminates were synthesized via MgO doping at various contents.Their structure and hydrates were characterized by scanning electron microscopy,X-ray diffraction and Fourier transform infrared spectroscopy.The results indicate that higher sintering temperature and MgO content improve the formation and stability of C_(4)AF and C_(12)F_(7).A phase separation occurs in molten aluminum phase.The black phase includes the main minerals like C_(3)A and periclase,while glass and yellow phases both have a low MgO content.The hydration heat of aluminate phase in the first day decreases with the increase of MgO content,indicating that MgO doping decreases the hydration rate of aluminate phase.In addition,the layered double hydroxides with a Mg:Al ratio of 2 or 3 appear in the hydration products of aluminate incorporated with MgO.

关 键 词：铝酸盐 氧化镁掺杂 晶体结构 水化 镁铝双金属氢氧化物 

分 类 号：TQ172[化学工程—水泥工业]