Abstract

The effect of Na₂O on the viscosity, structure, and crystallization behavior of CaF₂–CaO–Al₂O₃–MgO–TiO₂ slag was studied using the rotating cylinder method, differential scanning calorimetry, Fourier transform infrared spectroscopy, and X-ray diffraction analyses. The analyses demonstrated that with increasing Na₂O content, the viscosity and melting temperature of the slag decreased; however, the crystallization temperature increased. Na₂O acted as a network modifier to decrease the degree of polymerization in the titanoaluminate structure and consequently increased the mobility of ions in the slag structure. The network structures in the [AlO_nF_{4 – n}]-tetrahedral complexes and [AlO₄]-tetrahedra are depolymerized with the addition of Na₂O; however, the depolymerization had a minimal effect on the Ti–O stretching vibration. During the continuous cooling process of the slag without Na₂O, the crystalline phases of 11CaO·7Al₂O₃·CaF₂ were dominant, followed by CaF₂ and CaTiO₃. In addition to the first three phases, a new precipitated phase of NaAlO₂ was observed in the slag when Na₂O was added, and the sequence of crystallized precipitation during the continuous cooling process was 11CaO·7Al₂O₃·CaF₂, CaF₂, CaTiO₃, and NaAlO₂. The effective activation energy of 11CaO·7Al₂O₃·CaF₂ increased with increase in Na₂O content (0–3.9 wt %) and reached a maximum; however, a further increase in Na₂O content (6.6 wt %) decreased the effective activation energy of 11CaO·7Al₂O₃·CaF₂.

中文翻译：

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Na2O对电渣重熔CaF2-CaO-Al2O3-MgO-TiO2渣黏度、结构和结晶的影响

摘要

采用_转筒法、差示扫描量热法、_{傅里叶变换红外光谱}和X -射线衍射分析。分析表明，随着Na ₂ O含量的增加，炉渣的粘度和熔化温度降低；然而，结晶温度升高。Na ₂ O 充当网络改性剂以降低钛铝酸盐结构中的聚合度，从而增加渣结构中离子的迁移率。[AlO _{n中的网络结构}F _{4 –  n} ]-四面体络合物和[AlO ₄ ]-四面体通过添加Na ₂ O解聚；然而，解聚对 Ti-O 伸缩振动的影响很小。在无Na ₂ O渣连续冷却过程中，11CaO·7Al ₂ O ₃ ·CaF ₂晶相占主导地位，其次是CaF ₂和CaTiO ₃。除了前三相外，_当Na ₂加入O，在连续冷却过程中结晶析出的顺序为11CaO·7Al ₂ O ₃ ·CaF ₂、CaF ₂、 CaTiO ₃、NaAlO ₂。_{11CaO·7Al 2} O ₃ ·CaF ₂的有效活化能随着Na ₂ O含量(0-3.9 wt %)的增加而增加并达到最大值；然而，进一步增加Na _{2 O含量（6.6 wt%）会降低11CaO·7Al 2} O ₃ ·CaF ₂的有效活化能。