Recovery of aluminium and lithium from gypsum residue
#0183;#32;Based on the Bayer process, the gypsum residue from the lithium extraction process was digested by alkali to extract its aluminium and lithium. aluminium extraction and % lithium extraction were recorded at caustic ratio (Na 2 O/Al 2 O 3 molar ratio) of, digestion temperature of 136 #176;C and digestion time of 60 min.