Acid methods of red mud processing: problems and prospects

摘要

The paper shows the capability of extracting therare-earth metals by strong acids (HCI, HNO_3, H_2SO_4)from red mud of the aluminous production with minimum saltbackground. The experimental-industrial realization of thecomplex processing flowsheet of red mud with the help of usedpickling solutions from the ferrous metallurgy is confirmedwith obtaining Al-Fe-coagulant and Si-stoff. A basicopportunity is established as to extraction of rare-earth metals,Al and Si from red mud with the help of organic acids andmicroorganisms, which produce them. The flowsheet of rare-metal extraction from red mud using biosorption has been developed and used.