Study On The BF Burden Structure Optimization Of Cr-Bearing Vanadium-Titanium Magnetite

Cr-bearing vanadium-titanium magnetite is a symbiotic compound mineral,including Fe,V,Ti,Cr and other elements,which has a very high comprehensive utilization value.As most of the Hongge ore in Panxi is sealed.So the currently available Cr-bearing vanadium-titanium magnetite for the development and utilization are mainly concentrated in Chengde.The"BF-BOF" process is the main wayfor smelting.However,the BF is a complex performance.A reasonable choice of burden structure can achieve the purpose of reduction and protect sustainable development for China's steel industry.China has rich containing Cr-bearing vanadium-titanium magnetite and in the context of great value in use,the paper present experimental program on Cr-bearing vanadium-titanium magnetite containing the new charge structure development.Under laboratory conditions,this study researched a variety of performance of trial-related materials and basis of iron ore fines and also did a test preparation containing Cr-bearing acid vanadium-titanium sinter.On this basis,the study did the systematic study of the impact of softening and dropping performance for Cr-Bearing sinter of different basicity and didt he experimental study for pellet from the spot.In addition,considered the actual production conditions,to ensure basicity R=1.10 under the same conditions,by varying the proportion of sinter and pellets to adjust the integrated charge components and analyzed from softening,melting performance,material column permeability,dropping and other performance.Buy this study,the following conclusions can be gained:(1)From the performance of the chemical composition,the four kinds of Cr-bearing vanadium-titanium magnetite powder belong to low silicon iron ore fines,has higher valuable utilization;looking from the microcosmic morphology of four kinds of Cr-bearing vanadium titanium destruction of large particle iron ores,smooth edge without gaps and poor granulation performance;From the perspective of water absorption,red iron powderbe better than Cr-bearing vanadium titanium magnetite,inferred adding some red iron may improve granulation performance.(2)From the preparation by sintering pottest of acid Cr-bearing vanadium-titanium sinter,showed that acid sinter has slow combustion seed,low productivity,uneven particle size distribution,but it has high strength,and RDI+3.15 has excellent performance.Self-fluxing Cr-bearing vanadium-titanium sinter has lower strength,and RDI±3.15 is low.Considering the basicity R=0.4 acid sinter,it's better than natural basicity Cr-bearing vanadium-titanium sinter(R=0.28),and better than the self-fluxing Cr-bearing vanadium-titanium sinter ore.Acid sinter(R=0.4)has uniform structure,main magnetite is constituted of silicate-based binder,a small amount of lace-like hematite.It's appropriate to produce a small amount of acid sinter when the basicity is R=0.4.(3)Integrated the single burden structure of softening and dropping performance to show that:the softening starting temperature sintered ore rises with Increasing basicity,pellet softening starting temperature is low;as the molten zone basicity increase sinter decreased first after the rise,dropping its same temperature trends,When the basicity is greater than R=2.4,the dropping temperature can be more than 1550? with poor dropping performance;In contrast to the pellets,sinter has bandwidth reflowing zone and down position.(4)Integrated the mix burden structure of softening and dropping performance to show that:The new burden structure "(ultra)high basicity sinter + acid pellet + acid sinter'compares with the existing burden of "high basicity sinter + acid pellet " in the softening,permeability,etc.There are some advantages to improve the acid pellet in production capacity utilization problems or expensive.It makes it possible with the so good production and high quality for(ultra)high basicity Cr-bearing vanadium-titanium sinter in application.