摘要
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 degrees of ultra-fine hematite powder（the average particle size is 2μm）and conventional hematite powder（the range of particle size is 0.18 to 0.154mm）in non-molten process were studied.Taking the reduction degree of hematite powder as a target and according to the transformed L16（2^15）orthogonal table,a series of 4×23 times experiments were arranged to eliminate the interference of reduction atmosphere,reduction temperature and reduction time.The results show that ultra-fine hematite powder can be reduced from Fe2O3 to Fe at different degrees.Compared with conventional particle size hematite powder,ultra-fine hematite powder has a higher reduction degree,and the reduction temperature required to access the same reduction degree lowers about 365℃ under the condition of 650 to 850℃ and pure H2 or 100% CO atmosphere.There is no correlation among these factors,the quantitative impact of them can be separately estimated,and this provides a basis for establishing an equation of linear regression for each of them.After reduction at non-molten state,the particle size distribution of hematite powder indicates that inter-particle sintering does not occur and the reduction product is still powdery.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
2010年第11期1412-1417,共6页
Journal of University of Science and Technology Beijing
关键词
赤铁矿
还原
正交试验
线性回归
hematite
reduction
orthogonal test
linear regression
