CaO-Al_2O_3-CaF_2-SiO_2渣系的黏度

采用内旋转圆柱法测量了不同组成的CaO-Al2O3-CaF2-SiO2渣系的黏度,采用XRD分析技术对高温熔炼渣的物相进行分析,并计算了各渣样的黏流活化能.结果表明:当w(CaO)/w(Al2O3)一定,配渣中SiO2质量分数低于8%时,对渣样的高温黏度并没有明显的影响,在1 490℃以上时,熔渣黏度都低于0.5Pa.s;当SiO2质量分数增加到10%,渣样的高温黏度开始显著降低,温度高于1 440℃时,黏度值低于0.2Pa.s.随着SiO2含量的增加,熔渣的碱度逐渐降低,破坏了原来熔渣的大网状结构,熔渣的黏度明显降低.渣系的黏流活化能变化趋势与渣样的黏度值变化趋势一致.

Viscosities of Slags in CaO-Al2O3-CaF2-SiO2 System

The viscosities of different slags in CaO-Al2O3-CaF2-SiO2 system were measured by internal rotating cylinder method involving a spindle, and the high-temperature slag phases were analyzed by XRD. Then the viscous flow activation energies of the different slag samples were calculated. The results indicated that when the ratio of w (CaO)/w (Al2O3) is constant and the mass fraction of SiO2 in the slag system is lower than 8%, there is no obvious effect on the high-temperature viscosities of the slag samples. The viscosities of all the slags are lower than 0.5 Pa·s while the temperature is above 1490°C. When the mass fraction of SiO2 in slag comes up to 10%, the high-temperature viscosities of slags begin to decrease apparently. The viscosities of all the slags are lower than 0.2 Pa·s while the temperature is above 1440°C. The viscosities of slags decrease greatly with increasing SiO2 content because the original large meshed structure of slags is destroyed so as to reduce obviously the slag basicity. The viscous flow activation energies of the slag system CaO-Al2O3-CaF2-SiO2 tend to such a change that is compatible with the change in measured viscosities of slag samples.