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对铁品位在57%以下、理化和烧结性能较差的低品位矿粉按粗、细粒级搭配后,在混合矿中以29%的配比进行烧结杯试验。结果表明:细粒级矿配比为20%～26%,且增加粗粒B粉并减少C粉,有利于改善烧矿性能指标。基于使用该低品位矿的研究结果,设计了低品位矿配比分别为35%和41%的配用方案,其烧结指标合理、稳定;低品位矿配比为35%的方案烧结矿指标优于其他方案,与配比为29%的方案相比,转鼓指数平均提高2.49%,煤耗降低2.22kg/t,烧结矿矿相结构中针状铁酸钙明显增加,孔洞尺寸变小且分布分散,低温还原粉化率平均降低7.24%,软熔区间减少18℃。
For the low grade slag with less than 57% iron grade, poor physical and chemical properties and sintering performance, coarse and fine grade slag was blended in the mixed ore to make the sintered cup test at a ratio of 29%. The results show that the proportion of fine-grained ore is 20% ~ 26%, and the increase of coarse-grained B-powder and the reduction of C-powder are helpful to improve the sinter performance index. Based on the research result of using this low-grade ore, the scheme of low-grade ore proportioning with 35% and 41% respectively is designed. The sintering index is reasonable and stable. The low-grade ore proportion is 35% In other schemes, the drum index increased by 2.49% on average and the coal consumption decreased by 2.22kg / t, compared with the scheme with the ratio of 29%. The acicular calcium ferrite increased obviously in the phase structure of sinter and the pore size became smaller and distributed Dispersion, low temperature reduction pulverization rate decreased by 7.24% on average, soft melting range decreased by 18 ℃.