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研究了平均粒度为2μm的超细赤铁矿粉和粒度分布为0.18～0.154mm的常规细矿粉在非熔态下的还原情况.以矿粉的还原度为目标,用改造后的L16(215)正交表安排4×23次试验,以排除还原气氛、还原温度和还原时间等因素的干扰.结果表明,在纯H2、100%CO两种气氛下,温度为650～850℃时,均能实现不同程度Fe2O3→Fe的还原,与常规粒度矿粉相比,超细矿粉的还原度较高,获得相同还原度时所需的还原温度约低365℃.试验中,各因子之间均无相关性,可分别估计其定量的影响,建立线性回归式.超细赤铁矿粉非熔态还原后的粒度分布观察表明,颗粒间并未发生烧结,还原产物仍为粉状.
The reduction of ultrafine hematite powder with an average particle size of 2μm and the conventional fine ore powder with a particle size distribution of 0.18 ~ 0.154mm in non-molten state was studied.The aim of the reduction was to reduce the mineral powder with L16 ( 215) orthogonal table, 4 × 23 tests were conducted to eliminate the interference of reduction atmosphere, reduction temperature and reduction time.The results showed that under the atmosphere of pure H2 and 100% CO at 650 ~ 850 ℃, Can achieve different degrees of Fe2O3 → Fe reduction, compared with the conventional particle size of the ore, the higher the degree of reduction of ultrafine slag, obtaining the same reduction degree required reduction temperature of about 365 ℃ .In the experiment, the various factors No correlation can be estimated, respectively, to determine the impact of its quantitative, linear regression was established.Analysis of the particle size distribution of the ultrafine hematite powder after non-molten state reduction shows that there is no sintering between the particles and the reduced product is still powdery.