降低MgO含量对高Al2O3烧结矿冶金性能的影响

摘要：钢铁行业作为一个国家的支柱产业，在国民经济中占有举足轻重的地位。近些年来，随着炼铁原料成分的变化导致高炉渣中Al2O3的含量不断升高，使得炉渣黏度变大，给高炉冶炼带来困难。前人研究发现在烧结矿中添加MgO熔剂可有效解决这一问题，但是MgO也给烧结矿的冶金性能带来诸多影响。实验结果表明：随着MgO质量分数从2.8%降至2.0%后，烧结矿的冷态转鼓强度（TI）由72.1%提升至75.5%，还原指数（RI）由70.3%增加到73.4%，烧结矿的软熔带温度区间从251℃变为233℃，高炉内部的透气性变好，有助于高炉强化冶炼，提高企业经济效益。

Effect of reducing MgO content on metallurgical properties of high Al2O3 sinter

Abstract： As a pillar industry of a country, the iron and steel industry plays an important role in the national economy. Due to the change of raw material composition, the Al2O3 content in blast furnace slag is increasing, which increases slag viscosity and brings difficulties to blast furnace smelting. Previous studies found that adding MgO flux to sinter can effectively solve this problem. At the same time, MgO also has many impacts on the metallurgical properties of the sinter. The results show that with the mass fraction of MgO decreasing from 2.8 mass% to 2.0 mass%, the cold drum strength (TI) and reduction index (RI) of sinter increase by 3.4% (from 72.1% to 75.5%) and 3.1% (from 70.3% to 73.4%)， respectively. Besides, the temperature of soft melt zone changes from 251℃ to 233℃, leading to the enlargement of the air permeability of the blast furnace, which is helpful to strengthen the smelting of the blast furnace and improve the economic benefits of the enterprise.