1 School of Metallurgy and Materials Engineering, Chongqing University of Science and Technology, Chongqing 401331, China 2 Value-Added Process and Clean Extraction of Complex Metal Mineral Resources, Chongqing Municipal Key Laboratory of Institutions of Higher Education, Chongqing 401331, China 3 Chongqing Chuanyi Automation Co., Ltd., Chongqing 401120, China 4 Process and Systems Engineering, Abo Akademi University, Abo 20500, Finland 5 Department of Materials Science and Engineering, McMaster University, Ontario L8S 4L7, Canada
Effect of oxygen enrichment on sintering behavior of high proportion vanadium–titanium magnesite concentrates
1 School of Metallurgy and Materials Engineering, Chongqing University of Science and Technology, Chongqing 401331, China 2 Value-Added Process and Clean Extraction of Complex Metal Mineral Resources, Chongqing Municipal Key Laboratory of Institutions of Higher Education, Chongqing 401331, China 3 Chongqing Chuanyi Automation Co., Ltd., Chongqing 401120, China 4 Process and Systems Engineering, Abo Akademi University, Abo 20500, Finland 5 Department of Materials Science and Engineering, McMaster University, Ontario L8S 4L7, Canada
摘要 To achieve high-efficiency utilization of complex and unmanageable iron-containing minerals, the effects of oxygen enrichment on productivity, yield, flame front speed, exhaust gas peak temperature, and desulphurization reaction of the vanadium–titanium magnetite sintering process as well as sinter tumble index and mineralogy were clarified, with oxygen enrichment concentrations ranging from 21 to 29 vol.%. Results indicated that with increasing the oxygen enrichment concentration from 21 to 27 vol.%, the flame front speed increased from 30.3 to 40.0 mm min-1, the yield enhanced from 72% to 77%, and the productivity augmented from 1.83 to 2.67 t m-2 h-1; in the meantime, the tumble index was improved from 73.7% to 77.9%, and the exhaust gas peak temperature rose from 376.4 to 484.8 °C. The main reason for the improvement in sintering properties was the increased combustibility of fuels and the generation of proper liquid phase that improved the permeability of the packed bed. The improved sinter strength is mainly due to the increase in the phase fraction of silico-ferrites of calcium and aluminium. In addition, oxygen enrichment sintering could significantly increase the desulphurization level of vanadium–titanium magnetite sinter and the rate of desulphurization reaction during sintering process.
Abstract：To achieve high-efficiency utilization of complex and unmanageable iron-containing minerals, the effects of oxygen enrichment on productivity, yield, flame front speed, exhaust gas peak temperature, and desulphurization reaction of the vanadium–titanium magnetite sintering process as well as sinter tumble index and mineralogy were clarified, with oxygen enrichment concentrations ranging from 21 to 29 vol.%. Results indicated that with increasing the oxygen enrichment concentration from 21 to 27 vol.%, the flame front speed increased from 30.3 to 40.0 mm min-1, the yield enhanced from 72% to 77%, and the productivity augmented from 1.83 to 2.67 t m-2 h-1; in the meantime, the tumble index was improved from 73.7% to 77.9%, and the exhaust gas peak temperature rose from 376.4 to 484.8 °C. The main reason for the improvement in sintering properties was the increased combustibility of fuels and the generation of proper liquid phase that improved the permeability of the packed bed. The improved sinter strength is mainly due to the increase in the phase fraction of silico-ferrites of calcium and aluminium. In addition, oxygen enrichment sintering could significantly increase the desulphurization level of vanadium–titanium magnetite sinter and the rate of desulphurization reaction during sintering process.
Shi-hong Peng,Hao Liu,Ze-zheng Sun, et al. Effect of oxygen enrichment on sintering behavior of high proportion vanadium–titanium magnesite concentrates[J]. Journal of Iron and Steel Research International, 2023, 30(11): 2122-2132.
2023, Vol. 30 
