Effect of TiO2 content on metallurgical properties and mineral structure of fluxed pellets
In order to promote the efficient utilization of low-silica ferrotitanium concentrate powder in the pellet roasting and blast furnace ironmaking process,the fluxed pellets produced by the belt roaster pellets production line are taken as the test object,and the suitable titanium content of fluxed pellets is explored based on the characteristics of pellets with different TiO2 contents,and the changes of metallurgical properties and microstructure of fluxed pellets under different TiO2 content conditions are studied.The results show that when the mass fraction of fluxed pellets TiO2 exceeds 1.0％,the compressive strength decreases from 2 772 N/P to 2 530 N/P.The reduction degree is increased from 62.9％to 66.9％at 1 h.The reductive expansion index is stable below 9％;the pulverization rate of low-temperature reduction is decreased significantly,from 89.3％to 78.9％for＞6.3 mm,from 94.9％to 88.7％for＞3.15 mm,and from 4.2％to 6.4％for＜0.05 mm.In terms of mineral phase structure,the solid-phase ratio remains stable,the porosity is increased from 30.29％to 36.4％,and the number of large pores is increased significantly,the density of the sphere surface is decreased,and the liquid-phase ratio is decreased from 22.72％to 15.66％.Therefore,in order to ensure that the fluxed pellets have good metallurgical properties and mineral phase structure,the mass fraction of TiO2 should not exceed 1.0％.
belt roasterfluxed pelletsTiO2metallurgical propertiesmineral phase structure
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