Method for extracting lithium from electrolytic aluminum waste residues

The invention discloses a method for extracting lithium from electrolytic aluminum waste residues, which comprises the following steps: reacting slag powder with sulfuric acid, carrying out water immersion and filtration on a mixed solution after the reaction is completed, adding hydrogen peroxide and alkali liquor into filtrate for reaction, filtering, washing filter residues, evaporating and concentrating, then adding saturated sodium carbonate, stirring to prepare slurry, adding calcium oxide into the slurry for reaction, and filtering to obtain the lithium from the electrolytic aluminum waste residues. And filtering, introducing carbon dioxide into the filtrate for reaction, filtering, washing and drying to obtain the battery-grade lithium carbonate. The leaching reaction time is short, and the efficiency of extracting lithium from the electrolytic aluminum waste residues can be effectively improved; the reaction conditions are milder, the reaction can be generally completed at 70-90 DEG C, high-temperatu