The increase of the proportion of high Al₂O₃ content iron ore fine in iron and steel enterprises has brought about a series of problems such as the increase of the viscosity of blast furnace slag and the difficulty of the separation of slag and iron. In order to solve this problem, the effect of increasing MgO content on the technical and economic index, the cold strength, and metallurgical properties of high basicity and high-alumina sinter was studied through sinter pot test. Nova400NanoSEM field emission scanning electron microscope was used to analyze sinter microstructure. The experimental results show that when the MgO content fraction in the sinter with high basicity and high aluminum increases from 1.72 to 2.49%, the vertical sintering speed decreases by 4.38mm/min, the utilization coefficient decreases by 0.51t/(m² h), and the low-temperature reduction degradation index increases by 6.7%. When MgO content in sinter is 2.11%, drum index and reducibility index are the highest, reaching 61.93% and 86.39% respectively. Mg²⁺ is mainly solid dissolved in the magnetite lattice and replaces Fe²⁺, up to 3.64%. The generated magnesie-containing magnetite inhibits the phase transition from Fe₃O₄ to Fe₂O₃ oxidation process in the sinter cooling process, which reduces the generation of secondary hematite and is conducive to improving the low-temperature reduction degradation performance of sinter.

高Al ₂ O ₃比例增加钢铁企业含铁精粉带来了高炉渣粘度增加、渣铁分离困难等一系列问题。为解决这一问题，通过烧结罐试验研究了提高MgO含量对高碱度高铝烧结矿技术经济指标、冷强度和冶金性能的影响。Nova400NanoSEM 场发射扫描电镜用于分析烧结矿微观结构。实验结果表明，当高碱度高铝烧结矿中MgO含量分数由1.72%提高到2.49%时，垂直烧结速度降低4.38mm/min，利用系数降低0.51t/(m ²h)，低温还原降解指数提高6.7%。当烧结矿中MgO含量为2.11%时，转鼓指数和还原性指数最高，分别达到61.93%和86.39%。Mg ²⁺主要固溶于磁铁矿晶格中，取代Fe ²⁺，达3.64%。生成的含镁磁铁矿抑制了烧结矿冷却过程中Fe ₃ O ₄向Fe ₂ O ₃氧化过程的相变，减少了二次赤铁矿的生成，有利于提高烧结矿的低温还原降解性能。