Study on Leaching of Fe,Al and Ti from Red Mud with Sulfuric Acid

A systematic study has been made on the leaching of Fe,Al and Ti from red mud with sulphuric acid as leaching agent.Through the investigation on effects of reaction temperature,reaction time,liquid to solid phase ratio,concentration of sulphuric acid,particle size of red mud,calcination temperature and calcination time on the leaching rate,optimum conditions for three metals were determined.Experimental results showed that at reaction temperature 60 ℃,sulphuric acid concentration 12 mol/L,liquid to solid phase ratio 5,reaction time 1 h,particle size of red mud 0.15～0.18 mm,calcination temperature 600 ℃ and calcination time 5 hrs,the leaching rates of Fe,Al and Ti were 46.7%,63.3% and 54.3% respectively.The reaction kinetics was studied with unreacted shrinking core model and the kinetic equations of three metal ions were determined through simulation analysis of experimental data.