高碱度烧结矿还原过程中显微结构的变化

Microstructure Change of High Basicity Sinters During Reduction

在实验室模拟高炉气氛,进行高碱度烧结矿升温还原实验,当炉内温度达到实验温度（500,600,700,800,900,1 000,1 100℃）后立即结束实验,通过光学显微镜观察高碱度烧结矿还原过程中的显微结构,分析不同温度时高碱度烧结矿矿相的变化。结果表明：500-600℃区间内,Fe2O3开始还原为Fe3O4,低温（500℃）还原条件下,Fe3O4直接还原为星点状金属铁的雏晶;700-800℃区间内Fe3O4先还原成FexO,FexO再还原成金属铁;900℃时金属铁大量生成;1 000-1 100℃时,烧结矿内几乎是金属铁。

The reduction experiments of high basicity sinters were studied under the simulated condition of blast furnace. When the temperature of the furnace temperature reaches the experiment temperature（500, 600, 700,800, 900, 1 000, 1 100 ℃）,immediately end the experiment, then observe the microstructure of high basicity sinters by optical microscopy, analyze the different ore phases of high basicity sinters at different temperature. The result shows that within the temperature range of 500-600 ℃, Fe2O3 begins to revert to Fe3O4, at low temperature（500 ℃） reduction conditions, Fe3O4 is directly reduced to iron metal star-like crystallites; Within the temperature range of 700-800 ℃, Fe3O4 is firstly reduced to Fex O and then reduced to metallic iron, a lot of metallic iron is generated at 900 ℃, while within 1 000-1 100 ℃, the sinter is almost full of metal iron.