Abstract：Six groups of roasting slag samples under different temperatures in rotary kiln were simulated in laboratory. The morphology change of vanadium spinel,the change of phase content ,the occurrence law of vanadium and the phase transformation mechanism under different temperatures were studied. The morphology change results showed that the vanadium spinel underwent the following five processes: dense and smooth block-shaped-rimmed texture of iron oxide-complete cryptocrystalline material of vanadium spinel-recombination of small particles-growth. The content analysis results by mineral liberation analysis(MLA) indicated that limestone, fayalite, vanadium spinel and dolomite decreased gradually, while the content of augite increased gradually. Meanwhile, the iron oxide solid solution, some vanadium spinel crystals, calcium vanadate solid solution and pseudobrookite solid solution increased firstly and then decreased. The vanadium was mainly occured in oxides, which accounted for about 80%. The second occurrence state was silicate, which accounted for about 14%. In addition, very few vanadium elements were distributed in other carbonate minerals. The phase transformation mechanism in whole calcination process could be classified into four reaction processes, i.e., outward diffusion of Fe-inward diffusion of O-chemical combination of oxides-growth of embryo crystals of compounds.
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