Study on the Oxidative Desulfurization Mechanism of Panzhihua Ilmenite

The oxidation roasting can effectively remove the harmful element S of the ilmenite.In this work,the existence form of S element,process conditions of oxidative desulfurization and desulfurization mechanism for Panzhihua ilmenite were studied in detail.The results show that most of S for Panzhihua il-menite exists in the form of FeS and a small amount of S exists in the solid solutions of FeTiO₃ and sili-cate.In the oxidation roasting process,FeS of ilmenite is first removed and then S existed in the solid so-lutions is removed.When the oxidation temperature is between 650 and 750℃,only FeS is removed in the oxidation process;the rate of desulfurization reaction is great and the highest desulfurization ratio of ilmenite is about 85%~87%.The removal of S existed in the solid solutions requires much higher roastingt emperature and its reaction rate is relatively slower.When the oxidation temperature reaches to 950~1 050℃,most of FeS and S existed in the solid solutions could be removed after ilmenite is roasted for 60 min and the desulfurization ratio reaches to 96%~98%.