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

来源期刊:中南大学学报(英文版)2020年第5期

论文作者:饶明军 张鑫 李光辉 米寰鹏 梁斌珺 游锦香 彭志伟 姜涛

文章页码:1484 - 1494

Key words:ludwigite ore; reductive roasting; metallic iron; grain growth; size measurement

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× 10-4t·T+1.134×10-4T2.

Cite this article as: ZHANG Xin, LI Guang-hui, RAO Ming-jun, MI Huan-peng, LIANG Bin-jun, YOU Jin-xiang, PENG Zhi-wei, JIANG Tao. Growth of metallic iron particles during reductive roasting of boron-bearing magnetite concentrate [J]. Journal of Central South University, 2020, 27(5): 1484-1494. DOI: https://doi.org/10.1007/s11771- 020-4384-0.

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