PROCESS FOR PROCESSING RED MUD AND PRODUCING RARE-EARTH METAL SALTS

The invention relates to a process for processing red mud, said process comprising the following steps: (a) providing red mud waste of alumina production (in the following: red mud); (b) further, providing waste containing organic material, and converting to synthesis gas by high temperature pyrolysis; (c) converting the sodium oxide present in the red mud in the form of soluble glass to sodium carbonate with carbonic acid; (d1) magnetizing the Fe2O3 hematite ferric oxide present in the red mud and separating the anti-ferromagnetic Fe2O3 hematite ferric oxide from the remained slurry by magnetic separator; (d2) converting the Fe2O3 hematite ferric oxide present in the red mud to Fe3O4 magnetite ferrous ferric oxide with synthesis gas, and separating the Fe3O4 magnetite ferrous ferric oxide from the remained slurry by magnetic separator; (e) treating the remained slurry obtained in steps (d1) or (d2) with strong acid, thus obtaining metal sulphate solution and SiO2 and TiO2 suspension.