高炉炉缸炭砖的抗氧化性能

Oxidation Resistance of Carbon Bricks Used in Blast Furnace Hearth

借助于热力学分析和氧化性能实验,研究了高炉炉缸用炭砖在空气气氛下的氧化行为和氧化动力学。结果表明,炭砖的质量损失主要来自于石墨C氧化,质量损失量随温度升高、保温时间延长而增大。炭砖的氧化过程属于连续型氧化,而非保护型氧化。在800~1 200℃时,氧化过程的控速环节为碳氧界面反应控速,氧化反应的活化能为5 586.76 J/mol。石墨C氧化将导致炭砖内部形成多气孔的氧化层,随温度升高和时间增加,氧化层面积增大,材料耐压强度和密度降低。

The oxidation behaviors and kinetics of carbon bricks used in blast furnace hearth were investigated based on the thermodynamic analysis and the oxidation resistance experimental results. The results show that the mass loss of carbon bricks is due to the loss of carbon. The mass loss increases with increasing temperature and holding time. The oxidation process of carbon bricks belongs to the model of continuous oxidation rather than the model of protective oxidation. At 800–1 200 ℃, the rate-controlled step of oxidation process is the C–O reaction and the activation energy is 5 586.76 J/mol. The oxidation layer is formed in the internal carbon bricks due to the loss of carbon. The area of oxidation layer increases with increasing temperature and holding time, thus decreasing the strength and the density of the materials.