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Novel blast furnace operation process involving charging with low-titanium vanadium–titanium magnetite carbon composite hot briquette

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Abstract

An innovative process of blast furnace (BF) operation involving charging with low-titanium vanadium–titanium magnetite carbon composite hot briquette (LVTM-CCB) was proposed for utilizing LVTM and conserving energy. In this study, the effect of LVTM-CCB charging ratio on the softening, melting, and dripping behaviors of the mixed burden was explored systemically, and the migration of valuable elements V and Cr was extensively investigated. The results show that with increasing LVTM-CCB charging ratio, the softening interval T 40 − T 4 increases from 146.1°C to 266.1°C, and the melting interval T D − T S first decreases from 137.2°C to 129.5°C and then increases from 129.5°C to 133.2°C. Moreover, the cohesive zone becomes narrower and then wider, and its location shifts slightly downward. In addition, the recovery ratios of V and Cr in dripped iron first increase and then decrease, reaching maximum values of 14.552% and 28.163%, respectively, when the charging ratio is 25%. A proper LVTM-CCB charging ratio would improve the softening–melting behavior of the mixed burden; however, Ti(C,N) would be generated rapidly in slag when the charging ratio exceeds 25%, which is not favorable for BF operation. When considering the comprehensive softening–melting behavior of the mixed burden and the recovery ratios of V and Cr, the recommended LVTM-CCB charging ratio is 20%.

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Authors and Affiliations

  1. School of Materials and Metallurgy, Northeastern University, Shenyang, 110819, China

    Wei Zhao, Man-sheng Chu, Hong-tao Wang, Zheng-gen Liu & Ya-ting Tang

Authors
  1. Wei Zhao
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  2. Man-sheng Chu
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  3. Hong-tao Wang
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  4. Zheng-gen Liu
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  5. Ya-ting Tang
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Correspondence to Man-sheng Chu.

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Zhao, W., Chu, Ms., Wang, Ht. et al. Novel blast furnace operation process involving charging with low-titanium vanadium–titanium magnetite carbon composite hot briquette. Int J Miner Metall Mater 23, 501–510 (2016). https://doi.org/10.1007/s12613-016-1261-9

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  • DOI: https://doi.org/10.1007/s12613-016-1261-9

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