炼镍转炉溅渣护炉过程中溅渣层形成机理  

Formation Mechanism of Splashed Slag Layer in Nickel Converter during Slag Splashing Process

作　　者：马德刚[1] 陈伟庆[1] 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083

出　　处：《过程工程学报》2011年第3期391-395,共5页The Chinese Journal of Process Engineering

摘　　要：对炼镍转炉溅渣护炉期间镁铬残砖溅渣层的化学成分、熔化温度、粘度、物相结构及形成机理进行了研究.结果表明,溅渣初始砖衬表面形成了以铁氧化物为主的过渡层;炉渣进一步挂结,形成由铁镁橄榄石和磁铁矿构成的粘渣层,其中MgO含量上升至11.01%,半球点温度达1424℃;溅渣后下一炉冶炼过程中,过渡层中铁氧化物通过扩散与镁铬砖作用形成以高铁尖晶石和镁铁固溶体为主的反应层,其中Fe2O3含量由1.33%增至18.43%,半球点温度升高至1598℃.砖衬单炉损耗率降低近一半,炉龄大幅提高.The chemical composition, melting temperature, viscosity, microstructure of splashed slag layer, and its formation mechanism were investigated in used bricks during nickel blowing converter slag splashing process. The results show that at the very beginning of splashing the transition layer formed with main phase of iron oxides on the surface of brick. By further bonding of the slag and brick, the sticking layer formed and phases were hortonolite and magnetite. The content of MgO in the sticking layer was increased at 11.01%, and the melting temperature rose up to 1424℃. During the next blowing circle, the iron oxides in the transition layer diffused and reacted with the magnesia-chrome lining, resulting in the layer of Fe-spinal and Mg-Fe solution. Meanwhile content of Fe2O3 in sticking layer was obviously increased from 1.33% to 18.43% and melting temperature increased to 1598℃. The wearing rate of bricks per heat was decreased by nearly half and the lining life increased greatly.

关 键 词：炼镍转炉 溅渣护炉 溅渣层 结合机理 

分 类 号：TF806.2[冶金工程—有色金属冶金]