The effects of SiO₂ content on the preparation process and metallurgical properties of acid oxidized pellets, including compressive strength, reduction, and softening—melting behaviors, were systematically investigated. Mineralogical structures, elemental distribution, and pore size distribution were varied to analyze the mechanism of the effects. The results show that with an increase in SiO₂ content from 3.51wt% to 7.18wt%, compressive strength decreases from 3150 N/pellet to 2100 N/pellet and reducibility decreases from 76.5% to 71.4%. The micro-structure showed that pellets with high SiO₂ content contained more magnetite in the mineralogical structures. Additionally, some liquid phases appeared, which hindered the continuous crystallization of hematite. Also, the softening—melting properties of the pellets clearly deteriorated as the SiO₂ content increased. With increasing SiO₂ content, the temperature range of the softening—melting zone decreased, and the maximum differential pressure and the comprehensive permeability index increased significantly. When acid oxidized pellets are used as the raw materials for blast furnace smelting, it should be combined with high basicity sinters to improve the softening—melting behaviors of the comprehensive charge.

系统地研究了SiO ₂含量对酸氧化球团的制备过程和冶金性能的影响，包括抗压强度，还原度和软熔行为。改变了矿物学结构，元素分布和孔径分布，以分析其作用机理。结果表明，随着SiO ₂含量从3.51wt％增加到7.18wt％，抗压强度从3150 N /粒降低到2100 N /粒，还原度从76.5％降低到71.4％。微观结构表明，颗粒具有较高的SiO ₂含量在矿物结构中含有更多的磁铁矿。另外，出现了一些液相，这阻碍了赤铁矿的连续结晶。而且，随着SiO ₂含量的增加，颗粒的软化熔融性能明显降低。随着SiO ₂含量的增加，软化熔融区的温度范围减小，最大压差和综合渗透率显着提高。当将酸氧化的球团用作高炉冶炼的原料时，应将其与高碱度的烧结矿结合使用，以改善综合装料的软化-熔融行为。