RH炉用镁尖晶石砖和镁铬砖的使用性能比较

Service performance comparison of magnesia-spinel brick and magnesia-chromia brick used for RH degasser

对RH炉用镁尖晶石砖和镁铬砖的显气孔率、强度、线变化率、抗热震性能和抗渣性能进行了比较。结果表明:镁尖晶石砖经不同温度处理后的显气孔率小于镁铬砖的,强度大于镁铬砖的;经1 600℃处理后的永久线膨胀率和室温至1 500℃的热态线膨胀率大于镁铬砖的;抗热震性能和抗渣渗透性能优于镁铬砖的,抗渣侵蚀性能与镁铬砖的相当。认为镁尖晶石砖具备替代镁铬砖成为RH炉用新一代环保炉衬材料的可能。

The apparent porosity, mechanical strength, linear change rate, thermal shock resistance and slag resistance of the magnesia-spinel brick and magnesia-chromia brick used for RH degasser were com- pared. The results show that. （ 1） the magnesia-spinel brick fired at different temperatures has lower appar- ent porosity and higher mechanical strength than the magnesia-chromia brick; （2）the permanent linear ex- pansion rate after 1 600 ℃ heat-treatment and thermal linear expansion rate from room temperature to 1500 ℃ of the magnesia-spinel brick are higher than those of the magnesia-chromia brick; （3）the magnesia- spinel brick has better thermal shock resistance and slag penetration resistance, and comparative slag cor- rosion resistance than the magnesia-chromia brick. So the magnesia-spinel brick can replace the magne- sia-chromia brick as a new generation of environmental-friendly refractory lining material for RH degasser.