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

• Published in: International journal of minerals, metallurgy and materials Vol. 23; no. 5; pp. 501 - 510
• Main Authors: Zhao, Wei, Chu, Man-sheng, Wang, Hong-tao, Liu, Zheng-gen, Tang, Ya-ting
• Format: Journal Article
• Language: English
• Published: Beijing University of Science and Technology Beijing 01.05.2016; Springer Nature B.V
• Subjects: Blast furnace iron mixers; Briquets; Ceramics; Characterization and Evaluation of Materials; Charging; Chemistry and Materials Science; Composites; Corrosion and Coatings; Energy conservation; Glass; Hot blast; Magnetite; Materials Science; Melting; Metallic Materials; Natural Materials; Recovery; Slag; Softening; Surfaces and Interfaces; Thin Films; Titanium; Tribology; Vanadium; 充电操作; 成型燃料; 操作工艺; 熔融行为; 碳复合材料; 节约能源; 钒钛磁铁矿; 高炉操作; blast furnace practice; charging; magnetite; briquets
• ISSN: 1674-4799; 1869-103X
• DOI: 10.1007/s12613-016-1261-9

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 valu- able elements V and Cr was extensively investigated. The results show that with increasing LVTM-CCB charging ratio, the softening inter- val T40 - T4 increases from 146.1℃ to 266.1℃, and the melting interval To - 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 addi- tion, 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 op- eration. When considering the comprehensive softening-melting behavior of the mixed burden and the recovery ratios of V and Cr, the rec- ommended LVTM-CCB charging ratio is 20%.