Novel blast furnace operation process involving charging with low-titanium vanadium–titanium magnetite carbon composite hot briquette |
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作者姓名: | Wei Zhao Man-sheng Chu Hong-tao Wang Zheng-gen Liu Ya-ting Tang |
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作者单位: | School of Materials and Metallurgy, Northeastern University, Shenyang, 110819, China |
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基金项目: | The authors are especially thankful to the National Natu-ral Science Foundation of China(51574067),the Na-tional High Technology Research and Development Program of China(2012AA062302 and 2012AA062304),the Fundamental Research Funds for the Central Universities of China(N130602003) |
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摘 要: | 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 T40-T4 increases from 146.1℃ to 266.1℃, and the melting interval TD-TS first decreases from 137.2℃ to 129.5℃ and then increases from 129.5℃ to 133.2℃. 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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关 键 词: | blast furnace practice charging magnetite briquets |
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