摘要: 为了探究全进口矿条件下褐铁矿在烧结工艺的合理配置，针对S钢500m2大型烧结机实际原燃料条件，在基于试验用铁矿粉的常规理化性能和高温基础特性的基础上，开展了配加不同褐铁矿配比的烧结杯试验研究，并结合Factsage 7.1热力学计算软件模拟计算了不同褐铁矿配比条件下的黏附粉含量和理论液相生成量及性能。研究表明：澳大利亚褐铁矿具有矿粉粒度粗、矿化能力弱，同化温度低、粘结相强度差、吸液性强的特点，当褐铁矿配比由45%增加至55%时，提高磁铁矿OD矿配比至15%，同时控制OC矿配比降低至10%，烧结矿转鼓强度和低温还原粉化指标等性能达到最优，这是由于一方面提高磁铁精矿OD矿配比具有增加黏附粉比例、改善液相生成数量和性能的作用，可以均匀液相分布，消除过熔现象；另一方面，增加OD矿配比可以改善烧结料球的粒度组成，减少褐铁矿吸液量，提高烧结矿强度，因此，在高褐铁矿配比条件下，增加适宜的磁铁精矿配比有利于稳定烧结矿质量，改善烧结性能。
Research on optimal allocation of limonite in sintering process
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Abstract: In order to explore the reasonable configuration of limonite in the sintering process under the condition of all imported iron ore, in view of the actual raw material and fuel conditions of the 500m2 large-scale sintering machine of S Steel, based on the conventional physical and chemical properties and high-temperature basic characteristics of the iron ore powder used in the test, the experiments of sintering cups with different limonite ratios were carried out, and the content of the adhesion powder and the theoretical slag phase formation and performance with different limonite ratios were simulated and calculated by using the Factsage 7.1 thermodynamic calculation software. The results show that Australian Limonite is characterized by coarse particle size, weak mineralization ability, low assimilation temperature, poor bonding phase strength and strong slag phase absorption, when the ratio of limonite is increased from 45% to 55%, the OD ore ratio of magnetite will be increased to 15%, while the ratio of OC ore will be reduced to 10%, the sinter drum strength and low-temperature reduction and pulverization index will be improved. This is because, on the one hand, increasing the OD ore ratio of the magnetite concentrate not only has the effect of increasing the proportion of adhesion powder, improving the amount and performance of slag phase formation, but also can uniform slag phase distribution and eliminate over-melting. On the other hand, increasing the ratio of OD ore can improve the particle size composition of the sinter mixture, and reduce the amount of slag phase absorbed by the limonite, thus the strength of sinter is increased. Therefore, it is conducive to stabilize the sinter quality and improve the sinter performance by increasing the appropriate ratio of magnetite ratio under the condition of high limonite ratio.