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中南大学学报(英文版)

Journal of Central South University

Vol. 27    No. 5    May 2020

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Growth of metallic iron particles during reductive roasting of boron-bearing magnetite concentrate
ZHANG Xin(张鑫), LI Guang-hui(李光辉), RAO Ming-jun(饶明军), MI Huan-peng(米寰鹏),LIANG Bin-jun(梁斌珺), YOU Jin-xiang(游锦香), PENG Zhi-wei(彭志伟), JIANG Tao(姜涛)

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

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.

 

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

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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