强力混合对高比例精矿烧结的影响及机制

Effect and mechanism of intensive mixing on sintering with high proportion iron ore concentrate

通过混合试验、制粒试验以及烧结杯试验研究了强力混合技术对高比例精矿烧结的影响,包括混合效果、制粒效果以及烧结指标,阐明了强力混合影响高比例精矿烧结的作用机制。结果表明,与圆筒混合机相比,采用强力混合机时混合料中水分、生石灰和核颗粒分布更为均匀;制粒效果得到改善,制粒小球中粒度大于3 mm含量提高了8.25%(质量分数),平均粒度增大0.22 mm,透气性指数提高13.2%;烧结指标也得到改善,烧结速度提高2.06 mm/min,成品率提高0.58%,转鼓强度提高0.91%,利用系数提高了0.07 t/(m^(2)·h),且烧结矿FeO质量分数降低了0.52%,低温还原粉化率(RDI+3.15 mm)提高了4.13%,还原性指数提高了5.17%。

The effects of intensive mixing on mixing, granulating and sintering were studied by mixing test, granulation test and sinter pot trail, and the function mechanism of intensive mixing on sintering performance with high proportion iron ore concentrate were investigated. The results indicated that comparing with conventional drum mixer, the uniform dispersion of moisture, quicklime and coarse nuclear particles are realized by utilizing intensive mixer;and the suitable granulation moisture is 8.75 mass%, the average particle size is increased by 0.22 mm, the permeability index is increased by 13.2%;the sintering speed is increased by 2.06 mm/min, the yield is increased by 0.58 %, and the tumbler index is increased by 0.91%, the utilization factor is increased by 0.07 t/(m^(2)·h), and the FeO content of the sinter is reduced by 0.52 mass%, the reduction degradation index(RDI+3.15 mm) increased by 4.13%, and the reducibility index increased by 5.17%.