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Growth of metallic iron particles during reductive roasting of boron-bearing magnetite concentrate

含硼铁精矿还原焙烧过程中金属铁颗粒的生长规律

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Abstract

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.

摘要

研究了不同还原条件下含硼铁精矿在焙烧过程中金属铁颗粒的生长规律. 采用光学显微镜获取还原球团的数字图像, 考虑到球团不同部位金属铁颗粒生长情况的差异, 采用回归拟合分析得到内、 中、 外区域的权重比例为 1:7:19, 每个样品根据此权重比例共获取 54 张图像. 基于修正后的金属铁颗粒尺寸的测定方法, 建立了铁颗粒平均粒径D (μm)与还原温度 T (°C)、 时间 t (min)之间的回归模型: D=125−0.112t−0.2352T−5.355×10−4t2+2.032×10−4tT+1.134×10−4T2.

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Authors and Affiliations

  1. School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, China

    Xin Zhang  (张鑫), Guang-hui Li  (李光辉), Ming-jun Rao  (饶明军), Huan-peng Mi  (米寰鹏), Bin-jun Liang  (梁斌珺), Jin-xiang You  (游锦香), Zhi-wei Peng  (彭志伟) & Tao Jiang  (姜涛)

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  1. Xin Zhang  (张鑫)
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  2. Guang-hui Li  (李光辉)
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  8. Tao Jiang  (姜涛)
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Correspondence to Ming-jun Rao  (饶明军).

Additional information

Foundation item: Project(51804346) supported by the National Natural Science Foundation of China; Project(2019JJ50767) supported by the Natural Science Foundation of Hunan Province, China; Project(KY [2017]125) supported by Youth Foundation of Guizhou Education Department, China

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Zhang, X., Li, Gh., Rao, Mj. et al. Growth of metallic iron particles during reductive roasting of boron-bearing magnetite concentrate. J. Cent. South Univ. 27, 1484–1494 (2020). https://doi.org/10.1007/s11771-020-4384-0

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