基于软熔滴落性能的高炉合理炉料结构

 为全面掌握鞍钢的烧结矿碱度、天然块矿配加比例和不同炉料结构的软熔特性，得到可评价炉料结构的方法，通过实验室试验，系统研究了不同碱度烧结矿的冶金性能，不同碱度烧结矿与球团矿搭配、烧结矿与球团矿和天然块矿搭配的复合炉料结构高温特性。结果表明，随碱度提高，矿物组成渐趋合理，烧结矿的还原和粉化指标改善，在碱度为1.90～2.05时，单一烧结矿的软化熔融性能较好；在碱度为1.95～2.15时，透气性较好；当烧结矿与球团矿搭配，碱度为1.90～2.15时，软熔区间窄，S]特性值低；在配加天然块矿后，复合炉料的软化区间变宽，熔融区间变窄，综合性能得到改善。基于研究结果，提出了适合鞍钢原料条件的炉料间交互反应性的评价指数，通过指数判断，高炉天然块矿的适宜配加比例为15%～20%。

Rational burden structure of blast furnace based on softening and melting property

In order to fully understand the softening-meting properties of sintering ore with different basicity,ration of natural lump ore,and BF burden structures in Ansteel and find the methods used to estimate BF burden structures,some investigations were made systematically in laboratory on the metallurgical performance of sintering ore with different ba-sicity. In addition,the high temperature performance of combined BF burdens forming by the sinter with various basici-ty,pellet and natural lump ores,were also discussed. The results show that the mineral sinter compositions became more rational with the increase of basicity,hence,the reducibility and the reduction degradation were improved. When the basicity was in the range of 1.90-2.05,good softening-melting performance could be obtained just with individual sinter ore. As the basicity increased to 1.95-2.15,the penetrability was better. When the basicity of the combination of sinter and pellet was 1.90-2.15,the softening and melting zones became narrow and property with low S was realized. With the addition of natural lump ore,the softening zone widened while the melting zone became narrow,the compre-hensive performance was improved. Based on the research results,an assessment index for Ansteel raw material was ob-tained for the interactive reaction among burdens. The index can be used to assess the reasonableness of BF burden struc-ture. Considering the reactivity index and the economic cost,the reasonable proportion of lump ores in blast furnace needs to be controlled within 15%-20%.