Novel blast furnace operation process involving charging with low-titanium vanadium–titanium magnetite carbon composite hot briquette
来源期刊：International Journal of Minerals Metallurgy and Materials2016年第5期
论文作者：Wei Zhao Man-sheng Chu Hong-tao Wang Zheng-gen Liu Ya-ting Tang
文章页码：501 - 510
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°C to 266.1°C, and the melting interval TD- TS 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%.
Wei Zhao，Man-sheng Chu，Hong-tao Wang，Zheng-gen Liu，Ya-ting Tang
School of Materials and Metallurgy, Northeastern University
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°C to 266.1°C, and the melting interval TD- TS 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%.
关键词：
