Metall. Res. Technol.
Volume 115, Number 2, 2018
|Number of page(s)||9|
|Published online||26 February 2018|
Study of the reduction mechanism of ironsands with addition of blast furnace bag dust
School of Metallurgical Engineering, Xi'an University of Architecture and Technology,
710055, P.R. China
2 Research Center of Metallurgical Engineering and Technology of Shaan Xi, Xi'an University of Architecture and Technology, Xi'an 710055, P.R. China
3 The University of New South Wales, School of Chemical Engineering, Sydney 2032, Australia
* e-mail: email@example.com
Accepted: 8 December 2017
To improve the reduction properties of ironsands carbon-containing briquettes, the behavior of ironsand during reduction by the addition of blast furnace bag dust (BFBD) is studied using a high temperature resistance furnace, X-ray diffraction (XRD) analysis and scanning electron microscopy. Additionally, the reduction mechanism is discussed in this study. The results showed that the reduction level and compressive strength of ironsand carbon-containing briquettes could be promoted by increasing the proportion of BFBD. When the addition rate of BFBD was 31.25%, the metallization rate and compressive strength increased from 82.1% and 21.5 N/a to 91.4% and 172.5 N/a, respectively. Metallic iron reduced from BFBD particles favored the carbon gasification reaction, which enhanced the internal CO concentration, and then promoted the FeTiO3 reduction to Fe in ironsand. Meanwhile, a large amount of the liquid phase generated during the reduction process also favored Fe2+ diffusion, spread of iron joined crystals and the growth of crystals, which resulted in the improvement of the compressive strength of the ironsand carbon-containing briquettes.
Key words: ironsand / blast furnace bag dust / bonding strength mechanism / iron joined crystal
© EDP Sciences, 2018
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