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针对不同还原度球团矿、烧结矿及两者混合矿,通过单颗粒荷重软化实验,考察炉料软熔过程微观结构演变规律.结果表明,还原度决定炉料的软熔行为.低还原度下,熔化后炉料边缘形成渣相基体和蠕状金属铁结构,中心形成渣相基体和岛状浮氏体结构,炉料中心的低熔点渣相导致金属铁壳破裂导致渣相流出.高还原度下,炉料边缘和中心均形成渣相基体和蠕状金属铁相结构.渣铁分布状态更倾向于渣相被分割在金属铁相内,炉料中低熔点渣相数量减少使熔化温度升高,且渣相中低熔点的2FeO·SiO_2含量大幅降低,导致渣铁分离温度升高.球团矿和烧结矿界面间(Ca/Si)变化规律表明,还原度大幅提高使混合矿间交互作用开始温度升高,交互作用距离减小.
The results show that the degree of reduction determines the refractoriness of the charge.With the reduction of degree of reduction, After melting, the edge of the charge forms a slag phase matrix and a creep metallic iron structure, and the center forms a slag phase matrix and an island-shaped floating body structure. The low melting point slag phase in the center of the charge causes the metal shell to rupture, The edge of the charge and the center of the slag phase matrix and the formation of the creep-like metal phase structure. Slag iron distribution is more inclined to the slag phase is segmented in the metal phase, the charge in the low melting point slag phase decreases the melting temperature, and slag The content of 2FeO · SiO 2 with low melting point in the phase decreased significantly, which led to the increase of the temperature of slag-iron separation.The variation of Ca / Si between the pellets and the sinter showed that the reduction degree increased greatly and the inter- High, interaction distance decreases.