A low MgO content in sinter is conducive to reduce the MgO content in blast furnace slag. This study investigated the effect of MgO content in sinter on the softening—melting behavior of the mixed burden based on fluxed pellets. When the MgO content increased from 1.31wt% to 1.55wt%, the melting temperature of sinter increased to 1521°C. Such an increase was due to the formation of the high-melting-point slag phase. The reduction degradation index of sinter with 1.31wt% MgO content was better than that of others. The initial softening temperature of the mixed burden increased from 1104 to 1126°C as MgO content in sinter increased from 1.31wt% to 1.55wt%, and the melting temperature decreased from 1494 to 1460°C. The permeability index (S-value) of mixed burden decreased to 594.46 kPa·°C under a high MgO content with 1.55wt%, indicating that the permeability was improved. The slag phase composition of burden was mainly akermarite (Ca₂MgSiO₇) when the MgO content in sinter was 1.55wt%. The melting point of akermarite is 1450°C, which is lower than other phases.

烧结矿中的MgO含量低有利于降低高炉矿渣中的MgO含量。这项研究调查了烧结矿中MgO含量对基于助焊剂颗粒的混合物料的软化-熔融行为的影响。当MgO含量从1.31wt％增加到1.55wt％时，烧结体的熔融温度增加到1521℃。这种增加归因于高熔点炉渣相的形成。MgO含量为1.31wt％的烧结矿的还原降解指数优于其他。随着烧结物中MgO含量从1.31wt％增加到1.55wt％，混合炉料的初始软化温度从1104℃升高到1126℃，熔融温度从1494℃降低到1460℃。渗透率指数（S在高MgO含量为1.55wt％的条件下，混合负荷的-值降低至594.46 kPa·°C，表明渗透性得到了改善。当烧结矿中的MgO含量为1.55wt％时，炉渣的炉渣相组成主要为方铁矿（Ca ₂ MgSiO ₇）。铜黄铁矿的熔点为1450°C，低于其他相。