高碱度烧结矿低温还原过程中粉化机理的研究

The Chalking Mechanism of High-Basicity Sinter in Low-Temperature Reduction Process

摘要: 于显微镜下观察高碱度烧结矿低温还原20、40、60 min后显微结构的变化。研究发现烧结矿在低温还原时赤铁矿向磁铁矿的转变很少，烧结矿低温还原时显气孔率和体积几乎不变。进一步研究发现，低温还原时铁酸钙分解为赤铁矿生成新的小气孔，随反应的进行气孔变大导致相邻气孔不断合并，使烧结矿变为疏松大气孔结构，强度不断下降，这是造成烧结矿低温粉化的一个重要原因。

Abstract: The change of microstructure of high-basicity sinter after undergoing low-temperature reduction for 20, 40 and 60 min was observed. The study found that hematite transformed rarely to magne-tite in low-temperature reduction process of sinter, and the sinter’s apparent porosity and volume were almost constant. Further study found that with calcium ferrite decomposing into hematite in low-temperature reduction process, new small pores were generated, and the pores became larger along with the reaction, which resulted in merging of the adjacent pores. After that, the sinter’s structure became loose with big pores, and its intensity decreased, which caused chalking of the sinter in low temperature.