ZnO对硅酸盐水泥熟料矿物组成影响的研究

以空白生料为基准,掺入0.1%、0.3%、0.5%、1.0%、1.5%的ZnO,分别在1300 ℃,1350 ℃,1400 ℃,1450 ℃煅烧成熟料,用甘油-乙醇法、XRD结合Rietveld方法、岩相分析对熟料进行分析.结果表明:ZnO可以改善生料的易烧性,在较低温下明显促进f-CaO的吸收.不同煅烧温度下,随着ZnO掺量的增加,熟料中铝相减少,铁相增加,C3S矿物含量增多;在1450 ℃,当掺入1.5%的ZnO时,C3S存在晶型转变,由M3型转化为M1型.从1450 ℃煅烧条件下的样品熟料岩相图中可以看出,随着ZnO的掺入,改善了C3S晶型晶貌,使熟料具有良好的微观结构.

Effect of ZnO on the Mineral Composition of Portland Cement Clinker

Blank raw meal mixed with different 0.1%, 0.3%, 0.5%, 1.0%, 1.5% of ZnO respectively and sintered at 1300 ℃, 1350 ℃, 1400 ℃, 1450 ℃ to make clinkers.These obtained clinkers were characterized by glycerin-ethanol method, X-ray diffraction with the Rietveld method, and petrographic analysis.The results show that better burnability of cement raw meal doped with defined content of ZnO is observed;obviously, the absorption of f-CaO at low temperature is higher than that of industrial raw meal without mixing with ZnO.With the incremental dosage of ZnO in mineral compositions at different sintered temperature, the content of alumino phase is reduced;the dosage of ferrite phase is increased, the content of C3S (tricalcium silicate) is gradually increased.When the dosage of ZnO is 1.5% at 1450 ℃ the phase of C3S is transformed from M3 to M1.It can be seen from petrographic of sample clinkers after sintered at 1450 ℃ that with the contents of ZnO in raw meals adjust the crystal appearance to attain good microstructure of clinker.