Dissolution rate of Al2O3 into molten CaO–Al2O3–CaF2 flux
Dissolution rate of Al2O3 into molten CaO–Al2O3–CaF2 flux
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DOI：
10.1179/1743281214y.0000000187
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发表时间：
2014-10
影响因子：
2.1
通讯作者：
J. Li;Qifeng Shu;Yang Liu;Kuo-Chih Chou
中科院分区：
文献类型：
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作者：
J. Li;Qifeng Shu;Yang Liu;Kuo-Chih Chou
采用旋转圆筒法研究了Al_2O_3在CaO-Al_2 O_3-CaF_2系高铝钢连铸保护渣中的溶解。氧化铝棒在CaO-Al_2 O_3-CaF_2系熔剂中的溶解速率随转速和温度的升高而增大。焊剂C的传质表观活化能计算为255·6 kJ mol−1。氧化铝棒在熔融CaO-Al_2 O_3-CaF_2熔剂中溶解的速率控制步骤是溶质在熔剂边界层中的扩散。随着CaO/Al_2O_3的增加，Al_2O_3在CaO-Al_2 O_3-CaF_2系熔剂中的溶解速率增加，这可能是由于热力学驱动力增加和熔剂粘度降低所致。当Al_2 O_3棒浸入熔剂中时，首先生成CaO·2Al_2 O_3中间化合物，然后溶解于熔剂中。
Dissolution of Al2O3 into molten CaO–Al2O3–CaF2, a base system of mould flux for continuous casting of high Al steel, has been investigated by employing a rotating cylinder method. The dissolution rate of an alumina rod into molten CaO–Al2O3–CaF2 flux increased with increase in rotating speed and temperature. The apparent activation energy for mass transport of flux C was calculated to be 255·6 kJ mol−1. The rate controlling step during the dissolution process of the alumina rod into molten CaO–Al2O3–CaF2 flux was found to be the diffusion of the solute in the flux boundary layer. The dissolution rate of alumina into molten CaO–Al2O3–CaF2 flux increased with increasing CaO/Al2O3, and it may be caused by the increase in thermodynamic driving force and the decrease in the viscosity of the flux. When the Al2O3 rod was immersed into molten flux, an intermediate compound of CaO.2Al2O3 formed firstly and then dissolved into molten flux.