Influence of sintered carbon content of vanadium titanium ore on sinter quality and mineral phase structure
At present,with the adjustment of domestic iron and steel industry structure,some domestic enterprises using vanadium-titanium magnetite for blast furnace smelting have increased the demand for vanadium-titanium magnetite,and the use of vanadium-titanium magnetite for sintering has become one of the important research directions.However,there are a lot of shortcomings in the use of high proportion of vanadium-titanium magnetite for sintering.By exploring the influence of the amount of carbon on the metallurgical performance of sintered ore and the structure of the mineral phase,the appropriate amount of carbon is determined to ensure the quality of sintered ore.The results show that:when the amount of carbon is about 5.0 wt.％,the drum strength is 56.94％,the yield is 85.91％,the vertical sintering speed is 28.67mm/min,the softening start temperature is 1 167 ℃,the end temperature is 1 252 ℃,and the softening temperature interval is 85 ℃.As the amount of carbon content increases,FeO content rises,the reducibility decreases,the proportion of small grains(5-10 mm)decreases,the amount of liquid phase increases,the content of skeletal crystalline hematite decreases,the fusion structure increases,and the main bonding phases are calcium ferrite and silicate phases,and the structure is mostly granular-patchy.Through optimization experiments,the best parameters of carbon allocation were determined to improve the quality of vanadium-titanium magnetite sintered ore.
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