Fluoride Evaporation of Low-Fluoride CaF2-CaO-Al2O3-MgO-TiO2-(Na2O-K2O) Slag for Electroslag Remelting

被引:1
作者
An, Bo [1 ]
Gu, Yue [2 ,3 ]
Ju, Jiantao [2 ,3 ]
He, Kun [2 ,3 ]
机构
[1] Shaanxi Steel Grp Hanzhong Iron & Steel Co Ltd, Hanzhong 723000, Peoples R China
[2] Xian Univ Architecture & Technol, Sch Met Engn, 13 Yanta Rd, Xian 710055, Peoples R China
[3] Res Ctr Met Engn Technol Shaanxi Prov, Xian 710055, Peoples R China
基金
中国国家自然科学基金;
关键词
electroslag remelting; fluoride evaporation; thermogravimetric analysis; structure; thermodynamic calculation; THERMODYNAMIC PROPERTIES; K2O ADDITIONS; MOLD FLUXES; NA2O; VISCOSITY; CRYSTALLIZATION; LI2O;
D O I
10.3390/ma16072777
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
To elucidate the behavior of fluoride evaporation in an electroslag remelting process, the non-isothermal evaporation of the low-fluoride CaF2-CaO-Al2O3-MgO-TiO2-(Na2O-K2O) slag is studied using thermogravimetric analysis. The evaporation law of the melted slag is further verified using thermodynamic calculations. Fourier transformation infrared (FTIR) spectroscopy is used to evaluate the change in slag structure. It is discovered that the principal evaporating substances are CaF2, KF, and NaF, while the evaporation of MgF2, AlF3, and AlOF is less. KF evaporates absolutely in the early stage of the reaction, and CaF2 evaporates in a large proportion during the late reaction period. At 1500 degrees C, the order of vapor pressure is KF > CaF2. When K2O and Na2O are added to the residue sample at the same time, the evaporation ability of KF is stronger than that of CaF2 and NaF. As the K2O content increases from 0 to 8.3 wt%, evaporation increases from 0.76% to 1.21%. The evaporation rates of samples containing more K2O and those containing more Na2O are 1.48% and 1.32%, respectively. Under the same conditions, K2O has a greater effect on evaporation than Na2O. FTIR results show that the addition of K2O depolymerizes the network structure and that K2O can depolymerize the network structure better than Na2O.
引用
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页数:13
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