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首页> 外文期刊>ISIJ international >Dissolution Rate of Al_2O_3 into Molten CaO-SiO_2-Al_2O_3 Slags
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Dissolution Rate of Al_2O_3 into Molten CaO-SiO_2-Al_2O_3 Slags

机译：Al_2O_3在CaO-SiO_2-Al_2O_3熔渣中的溶解速率

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摘要

The dissolution rate of Al_2O_3 into the CaO-SiO_2-Al_2O_3 slag system was investigated at 1873 K by employing a novel experimental method which involved continual measurement of the torque variation on a rotating alumina rod dipped into a molten slag. Measured torque variation was successfully related to the dissolution rate of the rod. The dissolution rate of alumina was found affected by a number of factors: the rate increased with increasing temperature, the rotating speed of the rod, the CaO content in the slag, and the Al_2O_3 content in the slag for a fixed CaO content. It was found that the dissolution rate was highly dependent on the viscosity and the diffusivity of slags. The activation energy obtained from an Arrhenius type analysis was in the range of 84 kJ mol~(-1). It was concluded that the dissolution of Al_2O_3 into the CaO-SiO_2-Al_2O_3 slag system was controlled by the mass transfer in the slag phase. An iso-dissolution rate diagram was constructed for the dissolution of Al_2O_3 into the CaO-SiO_2-Al_2O_3 slag system at 1 873 K.
机译：采用新颖的实验方法研究了Al_2O_3在CaO-SiO_2-Al_2O_3炉渣系统中的溶解速率，该方法涉及连续测量浸入熔渣中的旋转氧化铝棒上的扭矩变化。测得的扭矩变化与杆的溶解速率成功相关。发现氧化铝的溶解速率受多种因素影响：速率随温度升高，棒的旋转速度，炉渣中CaO含量和炉渣中Al_2O_3含量（固定的CaO含量）而增加。发现溶解速率高度依赖于炉渣的粘度和扩散性。 Arrhenius型分析得到的活化能为84 kJ mol〜（-1）。结论是，Al_2O_3溶解在CaO-SiO_2-Al_2O_3炉渣系统中是由炉渣相中的传质控制的。绘制了等溶速率图，用于在1 873 K下将Al_2O_3溶解到CaO-SiO_2-Al_2O_3炉渣系统中。

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