METHOD FOR REMOVING FLUORINE IN WASTE LITHIUM BATTERIES

• Main Authors: OUYANG, Shibao, CHEN, Ruokui, RUAN, Dingshan, QIAO, Yanchao, LI, Changdong, CAI, Yong
• Format: Patent
• Language: Chinese; English; French
• Published: 06.04.2023
• Subjects: CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; PRETREATMENT OF RAW MATERIALS; PRODUCTION AND REFINING OF METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The present invention belongs to the technical field of processing waste lithium batteries, and disclosed is a method for removing fluorine from waste lithium batteries. The method comprises the following steps: adding an oxidizing agent and a first acid to waste lithium battery powder to perform oxidation and acid leaching as well as solid-liquid separation to obtain a fluorine-containing purification liquid; adding aluminum hydroxide to the fluorine-containing purification liquid to perform a precipitation reaction, adding an acid to adjust the pH, and performing solid-liquid separation to obtain a defluorinated liquid and sodium hexafluoroaluminate; adding aluminum hydroxide to the defluorinated liquid to perform a secondary precipitation reaction, adding an acid to adjust the pH, performing solid-liquid separation, collecting the liquid phase for extraction and obtaining a nickel cobalt manganese sulfate solution. In the present invention, after oxidation and leaching of waste lithium batteries by using a