氧化镁对高铝渣稳定性影响

 为解决降低成本，拓宽矿源的目的，对高铝矿终渣进行了细致且系统的研究。通过对黏度曲线的测量，动力学活化能的计算，热力学计算的手段，分析炉渣各组分析出规律及其变化，得出结果：炉渣稳定性与成分有较为紧密的关系，各超大型高炉炉渣成分相差不大，但黏度随温度变化规律确是大相径庭；一般来说，超大型高炉高温时炉渣活度差异较小，在160000~170000J，而在低温时活化能的变化率差异较大；高铝低镁渣的稳定性超过高铝高镁渣，如果能够使高炉中的镁降低可以大幅度提高炉料的冶金性能，降低渣量，是降低成本的有效措施；降低终渣中的镁含量不是否定镁对炉渣稀化作用，恰恰相反，提高渣中镁在液相中的作用效率；高铝渣未必就一定不稳定，应适宜调整炉渣其他组分，使高炉适应高铝渣操作。

Effect of MgO on High Aluminous Slag Stability

In order to lower cost and enlarge ore resource，the high aluminum final slag was systematically studied in this paper．Through viscosity test，kinetics activation energy calculation，thermal dynamics calculation，crystallization and changing rules of constituents of different slag were analyzed．The stability of slag has complicated relation with constituents，though the composition of ultra-large furnace is close with each other，the changing rules of viscosity are quite different．Normally，in high temperature the activation energy of different slag differs a little，between 160 000~170 000 J，and in low temperature the difference is significant．The stability of high aluminum low magnesium slag is higher than high aluminum and high magnesium slag，and if lowering the magnesium content the metallurgical properties of blast furnace burdens could be improved and slag ratio could be also lowered，which is effective measure to lower cost．Lowering the magnesium content in final slag is to increase the efficiency of magnesium．High aluminum slag doesn’t mean low stability，and by adjusting other constituents the blast furnace operation can adapt to high aluminum slag．