Mn^4+、Ni^3+、Co^3+、Cr^3+掺杂对硅酸盐水泥熟料烧成作用的研究  

Effect of Mn^4+,Ni^3+,Co^3+,Cr^3+doping on sintering process of portland cement clinker

作　　者：李飞 杨雷[2] 

机构地区：[1]甘肃交通职业技术学院,甘肃兰州730070 [2]河南理工大学,河南焦作454003

出　　处：《中国建材科技》2020年第6期55-58,共4页China Building Materials Science & Technology

基　　金：甘肃交通职业技术学院院级科研课题“交通工程设施试验检测技术教学研究”(2019Y——11);甘肃交通职业技术学院教学改革工程项目“基于TRIZ理论的高职学生公路试验报告编制训练”。

摘　　要：以空白生料为基准,分别掺入占质量分数为0.5%、1.0%、2.0%的MnO2(Ni2O3、Co2O3、Cr2O3),分别于1250℃、1300℃、1350℃和1400℃煅烧30min,制成MnO2(Ni2O3、Co2O3、Cr2O3)掺杂硅酸盐水泥熟料。利用化学分析、X射线衍射和扫描电子显微镜方法研究MnO2(Ni2O3、Co2O3、Cr2O3)掺杂对熟料的易烧性和矿物结构的影响。结果表明,重金属元素对促进熟料烧结过程中C3S形成的影响随着离子半径的增大而愈加明显;Mn元素在高温条件下会发生突变,对液相的生成起到促进作用,掺杂Mn^(4+)相当于降低了饱和比,对改善易烧性有利;Cr在低温环境下对C3S的形成较有利,而处于高温环境下对β-C2S的形成起稳定作用,最终使得C3S的含量有所降低。Based on the blank raw meal,MnO2(Ni2O3,Co2O3 or Cr2O3)with mass fraction of 0.5%,1.0%and 2.0%are added respectively and calcined at 1250℃,1300℃,1350℃and 1400℃for 30min to prepare MnO2(Ni2O3,Co2O3 or Cr2O3)doped Portland cement clinker.The effects of MnO2(Ni2O3,Co2O3 or Cr2O3)doping on the burnability and mineral structure of clinker are studied by chemical analysis,X-ray diffraction and scanning electron microscopy.The results show that the influence of heavy metal elements on the formation of C3S in clinker sintering process is more obvious with the increase of ionic radius.Mn element mutates at high temperature,which promotes the formation of liquid phase.The Mn4+doping can reduce the saturation ratio,which is beneficial to improve the burnability.Cr is more favorable for C3S formation in low temperature environment,but it is beneficial to stabilize the formation ofβ-C2S under high temperature environment,resulting a decline of the content of C3S.

关 键 词：易烧性 水泥熟料 固溶 C3S C2S 

分 类 号：TQ172[化学工程—水泥工业]