Experimental Study on Fluidized Bed Oxidative Modification of Panzhihua Titanium Slag

The parameters of fluidized oxidation of Panzhihua titanium slag were determined by TG-DSC and theoretical calculations,and the roasting experiments at different temperatures were carried out.Furthermore,the titanium slag after modification by fluidized oxidation was characterized by Raman,XRD and SEM,respectively.The results show that the titanium slag has a relatively uniform particle size distribution,which is suitable for roasting by fluidization.The transitions of the main Ti-containing phases,successively from titanium oxides of low-valence state to anatase titanium dioxide and finally to rutile,occur during the fluidized oxidation of the slag.The ferrous anosovite phase is transformed into rutile and brookite phases.The oxidation rate increases with increase of the temperature.In the process of strong oxidation,a large number of small pores and microcracks are produced in the solid solution of anosovite.At 850～1 100 ℃,more surface microcracks and internal small pores are formed at a higher oxidation temperature,with more destruction of the lattice of the anosovite solid solution.