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基于金川炼镍生产工艺及炉型特点,开发了卧式侧吹转炉溅渣护炉技术。溅渣模式为一个转炉化渣、另一个转炉溅渣,溅渣气源为空气,调渣剂选用轻烧镁球。工业实践表明,溅渣期间,风眼砖损耗速率降低一半,镍转炉大修炉龄由360炉提高至595炉。溅渣前后炉渣分析表明,溅后渣MgO和Fe2O3含量显著增加,渣中镁铁橄榄石和磁铁矿比例增加,炉渣熔化温度及粘度大幅上升,镍转炉合理溅渣渣系为44%FeO-24%Fe2O3-25%SiO2-7%MgO。溅渣后砖衬表面形成的溅渣层由挂渣层和反应层组成,其中挂渣层包括镁铁橄榄石和磁铁矿,反应层为镁铁固溶体和镁铬铝铁尖晶石。
Based on Jinchuan smelting nickel production process and furnace type characteristics, the horizontal side-blown converter slag splashing protection technology has been developed. Slag splashing mode is a converter slag, another converter slag splashing, slag splashing air source, slag agent selected light burning magnesium ball. Industrial practice shows that during the slag splashing, the loss rate of the eyelet brick is reduced by half and the age of the nickel converter overhaul furnace is raised from 360 to 595. Slag analysis before and after slag splashing showed that the content of MgO and Fe2O3 increased significantly after slag splashing, the proportion of forsterite and magnetite in the slag increased, the melting temperature and viscosity of slag increased significantly, and the slag splashing system was 44% FeO-24 % Fe2O3-25% SiO2-7% MgO. The slag splashing layer formed on the surface of the brick lining after splashing slag is composed of a dross layer and a reaction layer, wherein the dross layer comprises magma feldspar and magnetite, and the reaction layer is a magnesia solid solution and a magnalium spinel.