Change of phase composition and valuable elements in V-Ti pellet during softening-melting and dripping process
The change of phase composition and valuable elements in the process of softening-melting and dripping of acidic V-Ti pellet of Pangang were quantitatively studied by simulating the smelting at-mosphere in blast furnace.The results show that Ti and V gradually migrated from titanohematite and ilmenite to slag phase during the softening-melting and dripping process of V-Ti pellet.TiO2 could not only be reduced to Ti into metal iron,but also generate a large amount of titanium carbonitride.In the dripping test,the yield of V in metallic iron was 36.03％,which was much higher than 3.13％of Ti and 17.20％of Si.The absorbing S from coke by slag and metallic iron and the desulfurization reaction between them were carried out simultaneously,and the ratio of S in metallic iron decreased from 72.84％after softening-melting test to 50％after dripping test.Pyroxene and anosovite were more than 80％in the flooding slag of softening-melting test,and more than 70％of V and Ti in this slag were dis-tributed in anosovite.While in residual slag of softening-melting test,pyroxene decreased obviously,olivine and spinel increased obviously,and V and Ti increased obviously in spinel.During the dripping test,TiO2 was gradually reduced until the sum of TiC and TiN mass fraction exceeded 20％,so the slag was gradually transformed from high titanium-type slag with TiO2 mass fraction over 30％to low titani-um-type slag with TiO2 mass fraction less than 10％,and anosovie and its V and Ti in the residual slag were significantly reduced,while olivine and its distribution of V and Ti were increased.
blast furnaceV-Ti pelletsoftening-smelting and drippingphase compositionvaluable elementtitanium carbonitride
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