燃料粒度对烧结指标的影响研究

Study on influence of particle size of fuels on sintering indexes

为研究燃料粒度对烧结指标的影响,通过STA差热分析了不同粒度燃料的燃烧性能,通过烧结杯实验研究了不同粒级燃料对烧结过程指标及烧结矿质量的影响,通过显微镜分析了不同方案下烧结矿的矿相结构。结果表明:各粒度的燃料均在接近500℃时开始燃烧,在800℃时均燃烧完毕;粒度越小,开始燃烧温度相对越低,燃烧速度越快;燃料粒度越大,开始燃烧温度相对稍高,燃烧速度越慢;降低燃料中小于1 mm比例,增大1~3 mm燃料粒度,能够提高燃料燃烧热的利用率,增宽燃烧带,有利于液相生成,提高烧结矿质量。

In order to study the influence of fuel size on sintering indexes, the combustion performances of different particle size of fuels were studied through STA differential thermal analysis, the influences of different particle size of fuels on the sintering process indexes and sinter quality were studied by a series of sinter pot tests, and the mineralogical structure of sinter under different schemes was analyzed through microscope. The results show that, different size of fuels obviously begin combustion at close to 500 ~C and complete combustion at 800 ~C. The smaller the particle size is, the lower the initial combustion temperature is, and the faster the combustion rate. The larger the fuel particle size is, the higher the initial combustion temperature is, and the slower the combustion rate is ; Reducing the proportion of fuels less than 1 mm and increasing the proportion of fuels with particle size 1 ~ 3 mm can increase the utilization rate of fuel combustion heat, broaden combustion zone and it is beneficial to the formation of liquid phase and to the improvement of sinter quality.