硼镁铁精粉的烧结性能试验及工业应用

Sintering character test and industrial application of ludwigite powder

为了拓展可用铁矿资源的来源途径,本文对一种含硼、镁的铁矿资源(丹东硼镁铁精粉)的烧结性能进行试验研究,并开展相关工业应用试验。结果表明:硼镁铁精粉的同化性能与杨迪粉接近,液相流动性能与PB粉接近;在现有烧结原料和工艺条件下,硼镁铁精粉等比例替代地方磁精粉,有利于提高烧结矿的成品率,降低固体燃料消耗,改善烧结矿的低温还原粉化性能。该铁精粉配比低于10%对提高烧结机利用系数和烧结矿转鼓强度有利,高于10%对上述两个指标有负面影响。工业应用试验结果表明,配加3%的硼镁铁精粉后,烧结矿的全铁品位略有降低,烧结矿中B_(2)O_(3)质量分数增加,达到0.56%;烧结矿的粒度组成得到优化,(5,10)mm和≤5 mm的粒级占比分别降低0.79%和1.29%,>40 mm的粒级占比增加3.01%;烧结机利用系数由1.60 t/(m^(2)·h)提高到1.62 t/(m^(2)·h),烧结矿转鼓强度提高2.22个百分点,低温还原粉化指数(>3.15 mm)由58.80%上升至60.29%,烧结矿产、质量指标均有明显改善。

In order to expand the range of available iron ore resources,the sintering character of an iron ore resource containing boron and magnesium(Dandong ludwigite powder)are experimentally studied,and related industrial application tests are carried out.The results show that the assimilation performance of ludwigite powder is close to that of Yangdi powder,and the liquid phase fluidity is close to that of PB powder.Under the raw materials of existing sintering and process condition,ludwigite powder and other proportions replace local magnetic powder,which is conducive to improving the yield of sinter,reducing solid fuel consumption,and improving the low-temperature reduction and pulverization performance of sinter.The ratio of iron powder is less than 10%,which is beneficial to improve the utilization coefficient of sintering machine and the drum strength of sinter,and higher than 10%,which has a negative impact on the above two indicators.The results of industrial application test show that,after the addition of 3% ludwigite powder,the total iron grade of the sinter decreases slightly,and the B 2O 3 mass fraction in the sinter increases to 0.56%,the particle size composition of the sinter is optimized,the proportion of(5,10)mm and≤5 mm decreases by 0.79%and 1.29%,respectively,and the proportion of>40 mm increases by 3.01%,and the utilization coefficient of the sintering machine increases from 1.60 t/(m^(2)·h)to 1.62 t/(m^(2)·h).The drum strength of the sinter increases by 2.22%,and the low-temperature reduction pulverization index(>3.15 mm)increases from 58.80%to 60.29%,and the sinter yield and quality indexes are significantly improved.