低碳镁钙碳砖与镁碳砖的抗AOD炉渣对比

AOD furnace slag resistance comparison of low carbon MgO-CaO-C brick and MgO-C brick

为了减少耐火材料中碳对冶炼超低碳钢的不利影响,以回转炉为载体,使用天然气和氧气为加热介质,将镁碳砖与低碳镁钙碳砖交替砌入回转炉内。当炉内试验砖的热面温度达到1 650℃时,先加入500 g碎钢,然后再加入500 g AOD炉渣,保持渣池深度在10 mm左右,熔渣每隔1 h更换1次,更换10次后结束试验,将炉内试样冷却到室温取出,从热面中间纵向切开并对侵蚀深度和面积进行测量,对比镁碳砖与低碳镁钙碳砖的抗AOD炉渣性能。结果表明:低碳镁钙碳砖挂渣性比镁碳砖的好,并且形成明显的致密层,其抗AOD渣侵蚀能力明显好于镁碳砖。因此,建议可用低碳镁钙碳砖取代镁碳砖为AOD炉衬冶炼超低碳钢。

In order to reduce the negative effects of carbon in refractories on refining ultra-low carbon steel, the AOD slag resistance of low carbon MgO-CaO-C bricks and MgO-C bricks was investigated. The MgO -CaO-C bricks and MgO-C bricks were alternately installed in a rotary furnace with natural gas and oxygen as heating medium. When the hot face temperature of the brick reached 1 650℃,500 g steel scrap was added at first,then 500 g AOD slag was added ,the depth of molten slag was kept around 10 mm,and the slag was changed every hour for 10 cycles. After cooling,the bricks were taken out and cut longitudinally from the hot face center,and the corrosion depth and area were measured. The results show that the AOD slag resistance of low carbon MgO-CaO-C brick is better than that of MgO-C brick because MgO- CaO-C brick has better slag adhering ability and a dense layer forms obviously. Therefore,the MgO-CaO -C brick is suggested as the working lining in AOD furnace to make ultra-low carbon steel.