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中南大学学报(英文版)

Journal of Central South University

Vol. 26    No. 12    December 2019

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Effects of MgO additive on metallurgical properties of fluxed-pellet
GUO He(郭贺), SHEN Feng-man(沈峰满), JIANG Xin(姜鑫), GAO Qiang-jian(高强健), DING Guan-gen(丁关根)

School of Metallurgy, Northeastern University, Shenyang 110004, China

Abstract:As a main charging burden of blast furnace (BF) ironmaking process, pellets play an important role in ironmaking process. However, compared with sinters, there are some inevitable disadvantages for traditional acid pellets, e.g., reduction swell, low melting temperature. Therefore, the fluxed-pellets have been applied in BF, especially MgO-fluxed pellets. In the present study, the effects of category and content of MgO bearing additive on the compressive strength (CS), reduction swelling index (RSI), reduction disintegration index (RDI) and melting-dripping properties of the pellets were investigated. Minerals composition, pore distribution and microstructure of MgO-flux pellets were studied by X-ray powder diffraction (XRD), mercury intrusion method and scanning electron microscopy (SEM), respectively. The results show that the light burned magnesite (LBM) is more suitable MgO bearing additive for fluxed-pellets. With increasing LBM content from 0 to 2.0%, the CS decreases from 3066 to 2689 N, RSI decreases from 16.43% to 9.97% and RDI decreases from 19.2% to 12.99%. The most appropriate MgO bearing additive content in the fluxed- pellets is 2.0% according to principal component analysis (PCA).

 

Key words: pellets; MgO bearing additive; porosity; swelling; ironmaking; principal component analysis

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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