Abstract: The processes of acid leaching oxidizing modification and microwave digestion to prepare high quality Ti concen- trate from Panzhihua Ti-slag were contrastively studied.The as-prepared products were characterized by XRD，SEM，and other techniques.It was found that Ti-slag had a low leaching reactivity in the oxidizing modification，and its impurities could not be removed effectively by atmospheric leaching.However，Ti-slag had a much better leaching reactivity in microwave digestion process which was helpful to destroy the dense structure.Besides，the best microwave digestion conditions were that the hydrochloric acid mass fraction was 25%，the ratio of acid to ore was 4 mL/g，and the pressure was 0.2 MPa.Under those conditions superior Ti concentrate contained over 88% TiO2，Fe of 2%~3%（mass fraction），and MgO+CaO（mass fraction）< 1.5%，which met the requirements of raw material of titanium oxide by fluidized chloridization process.

Key words: Ti-slag, Ti-rich feedstock, oxidizing modification, microwave digestion