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国内某厂生产的低钛烧结矿可用于2 500 m3高炉冶炼,强度指标达到普通烧结矿水平,但其低温还原粉化率仍比普通烧结矿高40%以上,还原粉化机理尚不明确。通过分段测试低钛烧结矿的还原粉化率并进行矿相分析,结果发现:低钛烧结矿中的赤铁矿-气孔结构是产生裂纹的源头,铁酸钙熔蚀结构是主要粘结相,但此结构中有许多细小裂纹,裂纹沿程存在许多赤铁矿晶粒,其还原速率较快且易形成交叉网状裂纹,使粘结相结构受到严重破坏,致使烧结矿还原粉化性能差。
The low titanium sinter produced in a certain factory can be used for smelting 2 500 m3 blast furnace and its strength index reaches the level of ordinary sinter ore. However, its low-temperature reduction and pulverization rate is still over 40% higher than ordinary sinter ore, and the mechanism of reduction and pulverization is not clear. Through the sub-test of reducing titanation of low-titanium sinter and the analysis of the mineralogical phase, it is found that the hematite-stomatal structure in the low-titanium sinter is the source of cracks and the calcium ferrite corrosion structure is the main bond However, there are many small cracks in this structure. There are many hematite grains along the crack. The reduction rate is relatively fast and the cross-network cracks are easily formed, which seriously damages the structure of the binder phase, resulting in the reduction of sinter Poor performance.