Abstract

The effect of K₂O on phase relation and viscosity of the CaO–SiO₂–25 wt % “FeO”–12 wt % ZnO–3 wt % Al₂O₃ slags was investigated using the rotating spindle method. Experimental results show that the slag viscosity increases with the first addition of K₂O, exhibiting a maximum at K₂O content of 1 wt %, followed by a decrease. The activation energy for viscous flow initially increases and then decreases with the increasing K₂O content. K₂O can lower the breaking temperature (T_Bk) of the slag at studied composition range. X-ray diffraction (XRD) analysis and thermodynamic calculation using Factsage^TM 7.2 show that the melilite phase initially precipitates from the liquid phase, followed by the precipitation of olivine phase. Furthermore, Fourier transform infrared (FTIR) analysis reveals that the effect of K₂O on the aluminate structure is prior to that of silicate structure. K₂O first increases the degree of polymerization (DOP) of the slag by charge compensation effect, while acts as a network modifier when K₂O is added to a certain value.

中文翻译：

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K 2 O对CaO-SiO 2 -ZnO-FeO-Al 2 O 3系炉渣的相关系和粘度的影响

摘要

使用旋转主轴法研究了K ₂ O对CaO–SiO ₂ –25 wt％“ FeO” –12 wt％ZnO–3 wt％Al ₂ O ₃炉渣的相关系和粘度的影响。实验结果表明，炉渣粘度随着第一次添加K ₂ O而增加，在1 wt％的K ₂ O含量下表现出最大值，然后降低。粘性流的活化能最初随着K ₂ O含量的增加而增加，然后降低。K ₂ O可以降低断裂温度（T _Bk）在研究的成分范围内的炉渣。使用Factsage ^TM 7.2的X射线衍射（XRD）分析和热力学计算表明，陨石相最初从液相中沉淀出来，然后是橄榄石相沉淀。此外，傅立叶变换红外（FTIR）分析表明，K ₂ O对铝酸盐结构的影响要比硅酸盐结构的影响先。K ₂ O首先通过电荷补偿作用提高炉渣的聚合度（DOP），而当K ₂ O添加到一定值时，K ₂ O用作网络调节剂。