Occurrence State of CaO in Panzhihua Ilmenite and Its Influence on the Quality of Synthetic Rutile

The phase structure and morphology of Panzhihua ilmenite and the synthetic rutile produced by Panzhihua ilmenite were deeply analyzed by XRD and SEM.It shows that CaO mainly dissolves with SiO₂,MgO,FeO and TiO₂ in silicate accompanying phase of the ilmenite.During the production of synthetic rutile,the silicate cannot be destructed by high-temperature redox modification and hydrochloric acid leaching,which leads to the enrichment of CaO in synthetic rutile and further influence on the quality of synthetic rutile.It is proposed that CaO in the ilmenite can be effectively removed and high-quality synthetic rutile can be produced by deeply grinding and adjusting the beneficiation parameters for the ilmenite.Cao component can also be separated by high gradient magnetic concentration of titanium-rich material to produce synthetic rutile satisfying the requirements for international large-scale boiling chlorination furnace.