转炉高氧化性炉渣溅渣护炉工艺优化及效果  

Slag splashing process optimization and results in BOFs with high oxidizability slag

作　　者：钟良才[1] 朱英雄[1] 姚永宽 蔡可森 周贺贺 

机构地区：[1]东北大学钢铁冶金研究所,辽宁沈阳110004 [2]南京钢铁股份有限公司,江苏南京210035

出　　处：《炼钢》2015年第5期1-6,50,共7页Steelmaking

摘　　要：转炉冶炼低碳钢低磷钢时，终渣氧化性强，渣中w（T.Fe）高达20％～30％，影响到溅渣护炉效果和转炉炉龄。在溅渣开始时采用改渣剂对高氧化性炉渣进行改质，可以降低炉渣中的T．Fe含量，提高炉渣MgO含量，增加炉渣的熔化温度和黏度，溅渣时起渣的孕育时间小于1min，炉渣中氧化铁与MgO-C炉衬中的碳反应受到抑制，防止溅渣层与炉衬之间气隙的产生，提高溅渣层的抗侵蚀能力，改善溅渣层与炉衬的粘结效果。对冶炼低碳钢低磷钢转炉溅渣护炉工艺的改进，显著提高了转炉的炉龄，吨钢补炉耐火材料消耗下降39％以上。End-point slag oxidizability of BOFs for low carbon steel and low phosphor steel blowing is very strong and T. Fe mass fraction in the slag is as high as 20 ; - 30 ;, which influence slag splashing results and BOFs＇ campaigns. A kind of slag modifier has been used to modify such high-oxidizability slag at the beginning of slag splashing. It can decrease T. Fe mass fraction and raise MgO mass fraction in slag. Melting temperature and viscosity of slag are increased. Incubation time in slag splashing is less than 1 min. Reaction between iron oxide in slag and carbon in MgO-C lining is suppressed, which prevents gas gaps formation between slag layer and MgO-C lining. As a result, corrosion resistance of the slag layer is heightened and cohesion effect between the slag layer and the lining is improved. Through the improvement of slag splashing process in BOFs for low carbon and low phosphor steel blowing, the BOFs＇ campaigns are increased obviously and fettling refractory consumption per ton of steel is decreased by more than 39 %.

关 键 词：转炉 高氧化性炉渣 溅渣护炉工艺 改渣剂 炉龄 

分 类 号：TF703[冶金工程—钢铁冶金]