Influence of alumina modulus on formation of high-magnesium clinker and morphological evolution of MgO

Influence of alumina modulus on formation of high-magnesium clinker and morphological evolution of MgO
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氧化铝模量对高镁熟料形成及MgO形态演变的影响

DOI:
10.1016/j.cemconres.2022.106986
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发表时间:
2022-12
影响因子:
11.4
通讯作者:
Hongtao Zhang
Hongtao Zhang
中科院分区:
工程技术1区
文献类型:
--
作者:
Wensheng Zhang;Zhengbin Luan;Xuehong Ren;Jiayuan Ye;Di Shi;Hongtao Zhang

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研究了氧化铝模数(AM)对高镁熟料(w(MgO)> 5%)形成的影响及MgO的形态演变,并利用分析试剂制备了不同MgO含量的熟料。通过高温显微镜(HTM)、热重-差热分析(TG-DTA)、X射线衍射(XRD)、光学显微镜和背散射电子能谱(BSE-EDS)等手段研究了烧结机理。结果表明,减少AM的用量可改善生料的易烧性,使阿利特颗粒更规则、更大。增加的AM有助于减小方镁石的尺寸,并导致其颗粒的形状为圆形。1.1的AM导致最低的液相线温度和增加的硅酸三钙(C3 S)含量。在这种情况下,可以获得MgO的最大固溶度和最小结晶度。当MgO含量为3%-6%时,C3 S和四钙铁铝酸盐(C4 AF)的含量最高。
This work investigates the influence of alumina modulus (AM) on the formation of high-magnesium clinker (w(MgO)> 5 %) and the morphological evolution of MgO and prepares clinkers with different MgO contents by using analytical reagents. High-temperature microscopy (HTM), thermogravimetric–differential thermal analysis (TG–DTA), X–ray diffraction (XRD), optical microscopy and backscattered electrons–energy–dispersive spectrometry (BSE–EDS) examine the clinkering mechanism. The results show that a reduced AM improves burnability of raw meal and the formation of more regular and larger alite particles. An increased AM contributes to reducing the size of the periclase and causes the shape of its particles to be round. An AM of 1.1 leads to the lowest liquidus temperature and increased tricalcium silicate (C3S) content. In this case, a maximal solid solubility and a minimal crystallinity of MgO can be obtained. The highest content of C3S and tetra-calcium aluminoferrite (C4AF) can be achieved at an MgO content of 3 %–6 %.
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