精炼钢包镁碳砖损毁机理分析和防范措施

Damage mechanism analysis of magnesium-carbon bricks in ladle refining furnace and preventive measures

精炼钢包镁碳砖属于不烧碳复合耐火材料,以熔点为2800℃的高熔点碱性氧化物氧化镁和难以被炉渣侵润的高熔点碳素材料为原料,添加各种非氧化物添加剂,用碳质结合剂结合而成。针对精炼钢包寿命波动大的问题,根据精炼渣成分变化和渣线部位镁碳砖物理化学性能,从化学反应熔损、高温真空分解挥发、熔渣侵蚀、钢液冲刷和弧光热冲击等几个方面分析导致LF钢包镁碳砖损毁的原因,制定有效的防范措施,提高了包衬寿命。

Refined magnesia carbon bricks for steel ladles belong to non burning carbon composite refractory mate-rials.They are made from high melting point alkaline oxide magnesium oxide with a melting point of 2800℃and high melting point carbon materials that are difficult to be penetrated by slag.Various non oxide additives are added and com-bined with carbon based binders.In response to the problem of large fluctuations in the service life of refining ladles,based on changes in the composition of refining slag and the physical and chemical properties of magnesium carbon bricks at the slag line,the reasons for the damage of LF ladle magnesium carbon bricks are analyzed from several aspects such as chemi-cal reaction melting loss,high-temperature vacuum decomposition volatilization,slag erosion,steel liquid erosion,and arc thermal shock.Effective preventive measures are formulated to improve the service life of the ladle lining.