Experiment on gas-based reduction of adding aggregate in vanadium-titanium magnetite ore
The treatment of vanadium-titanium magnetite ore by gas-based reduction process has gradually attracted the attention of researchers.However,the metallization rate of vanadium-titanium magnetite ore reduced by this process is low at present.Aiming at the problem of low metallization rate for gas-based reduction of vanadium-titani-um magnetite ore,the effects of the amount of semicoke,reduction atmosphere,reduction temperature and reduc-tion time on the metallization rate and compressive strength of gas-based reduction for vanadium-titanium magnetite ore were studied using semicoke as aggregate.The phase change and microstructure change of the reduction product were analyzed by X-ray diffraction(XRD)and scanning electron microscopy(SEM),and the mechanism of semi-coke was obtained.The results show that the addition of semicoke can improve the effect of gas-based reduction of vanadium-titanium magnetite ore.Under the conditions of reduction atmosphere φ(H2)/φ(CO)=2.5,reduction temperature 1 100 ℃ and reduction time 60 min,the metallization rate of the sample without semicoke is only 81.78％.Under the same conditions,when the addition amount of semicoke is 6％,the metallization rate of sample can reach 92.35％.The reduction process of titanium-iron compounds is Fe2.75 Ti0.25 O4 → Fe2 TiO4 → FeTiO3 →FeTi2O5 →TiO2 and Fe,with the increase of reduction temperature,the metal iron phase gradually gathers and con-nects into a piece,and the slag phase is obviously separated from the iron phase.After the addition of semicoke,the number of pores inside the sample increases significantly,which promotes the diffusion of reducing gas into the sam-ple,promotes the reduction to continue,and finally improves the reduction effect of the sample.The research result provides theoretical guidance for gas-based reduction of vanadium-titanium magnetite ore.
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