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Growth of metallic iron particles during reductive roasting of boron-bearing magnetite concentrate
Journal of Central South University ( IF 4.4 ) Pub Date : 2020-06-10 , DOI: 10.1007/s11771-020-4384-0
Xin Zhang , Guang-hui Li , Ming-jun Rao , Huan-peng Mi , Bin-jun Liang , Jin-xiang You , Zhi-wei Peng , Tao Jiang

The growing characteristics of metallic iron particles during reductive roasting of boron-bearing magnetite concentrate under different conditions were investigated. The size of the metallic iron particles was quantitatively measured via optical image analysis with consideration of size calibration and weighted ratio of image numbers in the core, middle and periphery zones of cross-section of pellets. In order to guarantee the measurement accuracy 54 images were captured in total for each specimen, with a weighted ratio of 1:7:19 with respect to the core, middle and periphery section of the cross-section of pellets. Increasing reduction temperature and time is favorable to the growth of metallic iron particles. Based on the modification of particle size measurement, in terms of time (t) and temperature (T) a predicting model of metallic iron particle size (D), was established as: D=125-0.112t-0.2352T-5.355×10-4t2+2.032× 10-4tT +1.134×10-4T2.



中文翻译:

含硼磁铁矿精矿的还原焙烧过程中金属铁颗粒的生长

研究了不同条件下含硼磁铁矿精矿还原焙烧过程中金属铁颗粒的生长特性。考虑到尺寸校准和丸粒横截面的芯部,中部和外围区域中的图像编号的加权比,通过光学图像分析来定量测量金属铁颗粒的尺寸。为了确保测量精度,每个样品总共捕获了54张图像,相对于颗粒横截面的核心,中间和外围部分的加权比为1:7:19。还原温度和时间的增加有利于金属铁颗粒的生长。基于粒度测量的修改,以时间(t)和温度(Ť)金属铁颗粒尺寸的预测模型(d) ,被确定为:d = 125-0.112-0.2352 Ť -5.355×10 -42 + 2.032×10 -4Ť + 1.134×10- 4 Ť 2

更新日期:2020-06-10
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