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利用基础烧结设备检测了细粒级铁矿粉同化速度、流动能力,并通过微型烧结杯模拟料层下部单元点烧结过程的方法来研究配加15%细粒级矿粉的烧结矿结构变化,有效分析了3种细粒级矿粉在烧结时的液相行为及对烧结矿结构和性能的影响。通过比较生产用混匀矿与配加质量分数为15%的A、B、C粉的烧结矿结构表明:A粉有利于减少烧结矿内部孔洞的尺寸,减少核颗粒和液相间较大孔洞的数量,并能促进针铁矿发展;B粉会增加烧结矿内部大孔洞,增加柱状或片状铁酸钙的生成;C粉同化速度慢,液相流动能力差,粘结效果差,会使液相与核颗粒间孔洞尺寸和数量增加。烧结杯试验结果表明:在生产用混匀矿中使用质量分数为15%的A粉,烧结矿的转鼓指数提高2.94%,低温还原粉化指数(RDI)降低3.37%。
The basic sintering equipment was used to test the assimilation speed and fluidity of fine grade iron ore. The microstructure of sinter with 15% fine ore grade ore powder was studied by simulating the sintering process of the lower part of the material layer by miniature sintering cup. The effects of three kinds of fine grade ore powders on the liquid phase behavior and the structure and properties of sinter were analyzed effectively. By comparing the production of mixed ore with 15% of the mass fraction of A, B, C sintered powder structure shows: A powder is conducive to reducing the size of the pores within the sinter to reduce the larger nuclear particles and liquid-phase hole , And can promote the development of goethite; B powder will increase the large holes inside the sinter to increase the formation of columnar or sheet calcium ferrite; C powder assimilation speed is slow, liquid flow ability is poor, the bonding effect is poor, will So that the liquid phase and nuclear particles between the hole size and number increased. Sintering cup test results show that the rotary drum index of sinter increases by 2.94% and the RDI decreases by 3.37% when A powder with mass fraction of 15% is used in the production mixed mineral.