Abstract: Based on the present situation of the sulfuric acid titanium dioxide production process，the comprehensive utiliza- tion of titanium dioxide waste acid and the preparation of Ti-rich material were combined.The experimental study on titanium concentrate leaching to prepare Ti-rich material with titanium dioxide waste acid was carried out.The influences of acid-min- eral ratio，leaching temperature，and time etc.on the grade of Ti-rich material were investigated.Research results showed that：in a acid-mineral ratio（mL/g） of 8∶1，leaching temperature of 150 ℃，and leaching time of 7~8 h，the Ti-rich material with TiO₂ grade of more than 80% could be obtained.Through XRD analysis，the main phase FeTiO₃ of the titanium concentrate has been converted into the TiO₂ phase of the Ti-rich material after acid leaching

Key words: titanium dioxide waste acid, pressure leaching, titanium concentrate, Ti-rich material