不同SiO2质量分数精粉对烧结指标的影响

为了比较不同精粉配入混合料后对烧结指标及烧结矿质量的影响，进行了精粉高温性能测试及烧结杯试验。结果表明，不同精粉的表观形貌及高温性能有显著差别；在基本不改变熔剂结构的条件下，随精粉SiO2质量分数的升高，液相流动性显著降低，烧结过程中黏结相生成量减少，不利于混合料中各矿物之间黏结成矿。采用不同精粉烧结时，烧结矿微观矿物结构具有显著的差异；精粉中SiO2质量分数升高会导致烧结矿中铁酸钙生成量减少，SiO2酸盐逐渐增多，孔洞增加。与低SiO2精粉烧结相比，采用高SiO2精粉烧结后，固体燃耗增加，转鼓指数下降，粒度组成中小于10 mm的量增加。

Influence of different SiO2 mass fraction of fine powder on sinter index

In order to compare the influence of different concentrate powder on the sintering performance and the sinter quality, the high temperature performance test of concentrate powder and a series of sinter pot tests were performed. The experiment results showed that there were significant differences between the different iron ore concentrate in microstructure and high temperature property. Without changing the same flux structure, with the increase of the silica mass fraction in concentrate powders, the liquid phase fluidity index decreased, and the amount of the bonded phase decreased, which was not conducive to the formation of binder minerals in the mixture. When sintered with different iron ore concentrate, the microstructure of sinter had a significant difference. Increasing the SiO2 mass fraction in the iron ore concentrate resulted in the decrease of the production of calcium ferrite, the gradual increase of silicate and the increase of voids in sinter. Compared with the sintering of the low silica mass fraction in iron ore concentrate, when using the high silica of iron ore concentrate to sinter, the solid fuel consumption increased, the drum strength decreased and the particle size less than 10 mm increased significantly with the sintering of the high silica mass fraction in iron ore concentrate.