Ni2O3对C3S形成过程的影响及其固溶效应

C3S是水泥熟料中最重要的矿物,杂质离子固溶进入C3S晶格并促进其单斜型或三方型稳定存在,研究离子在C3S中的固溶作用机理,能更深入了解阿利特的微结构及性质。利用化学分析、XRD、DTA及相图分析,研究Ni2O3对C3S形成过程的影响及其固化效应。结果表明:Ni2O3主要以+2价的形式在CaO-Si O2二元体系中存在,因其优先与Si O2反应形成固溶体,f-CaO随Ni2O3掺量递增而增大;当Ni2O3掺量大于其CaO-Si O2二元体系固溶极限时,f-CaO变化趋势呈相反趋势,且促进C3S形成效应明显。通过最小二乘法及Ni2O3固溶度的精确界定,可推导出Ni2O3在C3S中的固溶反应分子式为:(Ca3-0.53xNi0.53x)(Si1-0.47xNi0.47x)O5(x=0.0442)。

Effect of Ni2O3 on the Formation of C3S and Solid Solution Mechanism

C₃S is the most important mineral in the cement clinker,alternative ions could be solidified into C₃S crystal lattice.Therefore,the solid solution mechanism was studied.Meanwhile,the achievement of this paper could be taken as a valuable reference for cement clinker industry.The effect of Ni₂O₃ on C₃S formation and solid solution mechanism were studied by means of chemical analysis,X-ray diffractometry（XRD） and phase diagram analysis.We have got the results: Ni₂O₃ mainly exists at +2 valence state in the CaO-SiO₂ duality system, because it firstly reacted with SiO₂,the content of f-CaO increased with increasing Ni₂O₃.CaO-SiO₂-Ni₂O₃ can form liquid melt when Ni₂O₃ exceed the content of solid solution;the variation of the content of f-CaO was opposite to that of Ni₂O₃.Ni₂O₃ accelerated the formation of C₃S.At last,by least square method and the amount of f-CaO,the molecular formula that Ni₂O₃ solidified in C₃S could be deduced:(Ca_3-0.53xNi_0.53x)(Si_1-0.47xNi_0.47x)O₅（x=0.0442）.