镍转炉溅渣护炉热态模拟

Thermal simulation of slag splashing in a nickel converter

为将溅渣护炉技术应用于炼镍转炉,在实验室镁铬质坩埚中进行了热态模拟溅渣实验.结果表明:FeO-Fe2O3-SiO2-MgO渣系为镍转炉溅渣护炉的合理渣型,增加渣中MgO和Fe2O3含量可以明显提高炉渣熔化温度,相应渣中高熔点相铁镁橄榄石和磁铁矿显著增加,采用此类炉渣溅渣可在镁铬砖内壁形成高熔点的溅渣层;溅渣后坩埚内壁的溅渣层由反应层和挂渣层组成,其中反应层物相为镁铁固溶体和镁铬铁铝尖晶石,挂渣层主要由铁镁橄榄石和磁铁矿组成.溅渣时采用空气喷吹可增加渣中Fe2O3,适合作为溅渣气源.

In order to apply the technology of slag splashing into a nickel smelting converter,the thermal simulation of slag splashing in a nickel converter was carried out with a Mg-Cr crucible in the laboratory.The results show that the FeO-Fe2O3-SiO2-MgO system is a reasonable slag type for slag splashing,increasing the contents of MgO and Fe2O3 in the slag can remarkably raise the molten temperature,and accordingly,such high melting phases as ferrohortonolite and magnetite increase dramatically.The slag splashing layer with high melting temperature can be formed by means of such a kind of slag.The inner surface of the crucible includes a reaction layer and a slag sticking layer.Phases in the reaction zone are Mg-Fe solid solution and Mg-Cr-Fe-Al spinal,while phases in the slag sticking layer are ferrohortonolite and magnetite.The Fe2O3 content can be increased by air injection,which is an ideal gas for slag splashing.