This article elucidates the quantitative relationship between viscosity and structure in a basic slag system of CaO-SiO2-MgO-Al2O3 and focuses on the role of Al2O3. Slag viscosity was measured by the rotating cylinder method, and structural information was obtained using Fourier transformation infrared, Raman and magic angular spinning nuclear magnetic resonance (MAS-NMR) techniques. The results show that, as the Al2O3 content increased, slag viscosity increased initially and decreased afterwards, directly indicating that Al2O3 had an amphoteric effect on slag viscosity. The Raman spectra verified that with increasing Al2O3 content, the concentrations of Q0(Si) and Q2(Si) decreased first and then increased, while that of Q1(Si) kept increasing and that of Q3(Si) increased first and then decreased. The 27Al MAS-NMR spectra proved that the mole ratios of AlO5 and AlO6 to AlO4 kept increasing with the increase of Al2O3 content, and, overall, Al2O3 changed from a network former to a network modifier. The relationship between the viscosity and structure of the molten slags was further analyzed quantitatively based on the modified (NBO/T), denoted as (NBO/T)′, and we found a fine linear correlation between the logarithm of viscosity and (NBO/T)′. Moreover, the variations of thermodynamic properties of this system also indirectly supported the present experimental results.

中文翻译：

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深入了解 CaO-SiO2-MgO-Al2O3 熔渣的粘度与结构之间的关系

本文阐明了 CaO-SiO2-MgO-Al2O3 基本渣体系中粘度和结构之间的定量关系，并重点介绍了 Al2O3 的作用。炉渣粘度采用转筒法测量，结构信息采用傅里叶变换红外、拉曼和魔角自旋核磁共振（MAS-NMR）技术获得。结果表明，随着Al2O3含量的增加，渣黏度先升高后降低，直接说明Al2O3对渣黏度具有两性作用。拉曼光谱证实，随着Al2O3含量的增加，Q0(Si)和Q2(Si)的浓度先降低后升高，而Q1(Si)的浓度不断升高，Q3(Si)的浓度先升高后降低。27Al MAS-NMR谱证明，随着Al2O3含量的增加，AlO5和AlO6与AlO4的摩尔比不断增加，总体上Al2O3从网络形成剂转变为网络改性剂。基于修正后的(NBO/T)，进一步定量分析了熔渣粘度与结构之间的关系，记为(NBO/T)'，我们发现粘度的对数与(NBO/T)之间存在良好的线性相关性。 T)'。此外，该系统热力学性质的变化也间接支持了目前的实验结果。基于修正后的(NBO/T)，进一步定量分析了熔渣粘度与结构之间的关系，记为(NBO/T)'，我们发现粘度的对数与(NBO/T)之间存在良好的线性相关性。 T)'。此外，该系统热力学性质的变化也间接支持了目前的实验结果。基于修正后的(NBO/T)，进一步定量分析了熔渣粘度与结构之间的关系，记为(NBO/T)'，我们发现粘度的对数与(NBO/T)之间存在良好的线性相关性。 T)'。此外，该系统热力学性质的变化也间接支持了目前的实验结果。