氧化钾对高炉渣冶金性能的影响

Influence of potassium oxide on metallurgical properties of blast furnace slag

以某钢铁企业A高炉炉渣主要成分为基准,添加不同含量的氧化钾,配制试验渣系,利用旋转黏度仪研究了氧化钾对高炉渣黏度和熔化性温度的影响,并利用Fact Sage 6.4热力学软件对炉渣初晶温度进行计算分析。结果表明:在试验条件下,炉渣的熔化性温度随着K2O含量的升高呈现先降低后升高的的趋势,炉渣熔化性温度从1 381℃降低到1 362℃,其最大降低幅度在20℃左右,这主要是因为K2O含量的升高导致炉渣初晶相从黄长石相逐渐转变为镁铝尖晶石相;炉渣黏度随K2O含量的增加先升高后降低,但变化幅度不大;通过计算发现炉渣表观活化能基本保持不变,这和炉渣黏度变化幅度较小相一致。

Different contents of potassium oxide were added to prepare the test slag based on the main chemical components of the slag produced from A blast furnace in one Iron and Steel Corp.The influences of potassium oxide on the viscidity and the melting temperature of blast furnace slag were studied using Rotary Viscosity Meter.Simultaneously,the thermodynamic theoretical calculation of the slag liquidus temperature was also made by FactSage 6.4 software.The results showed that under the experimental condition,with the increase of potassium oxide content,the melting temperature of the slag decreased at first and then increased after reaching the lowest point,the melting temperature of the slag dropped from1 381 ℃ to 1 362 ℃ with the most scope about 20 ℃,which was mainly attributed to the transformation of crystal phase from melilite to magnesium aluminate spinel phase when the content of potassium oxide increased.However,the viscosity of slag increased at first and then decreased after the peak value with the increase of potassium oxide content,but the changing amplitude was not big.It was also found through thermal calculation that the apparent activation energy of the slag changed little which was in consistent with the little variation of the viscosity.