Method for efficiently removing fluorine from waste lithium battery

• Main Authors: CAI YONG, RUAN DINGSHAN, CHEN RUOKUI, QIAO YANCHAO, LI CHANGDONG, OUYANG SHIBAO
• Format: Patent
• Language: Chinese; English
• Published: 21.01.2022
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; ELECTRICITY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; PRETREATMENT OF RAW MATERIALS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; PRODUCTION AND REFINING OF METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention discloses a method for efficiently removing fluorine from a waste lithium battery. The method comprises the following steps of mixing aluminum and a sodium hydroxide solution for reaction to obtain a sodium metaaluminate solution, introducing sulfuric acid into the sodium metaaluminate solution, carrying out stirring for reaction at a certain temperature to obtain a fluorine removal agent, adding a sodium fluoroaluminate seed crystal and the fluorine removal agent into an impurity-removed battery powder leaching solution, introducing a sodium carbonate solution at the same time, carrying out reaction at a certain temperature, controlling the pH value of a reaction endpoint, carrying out solid-liquid separation after the reaction is finished to obtain a fluorine-removed liquid and filter residues, adding a sodium hydroxide solution into the filter residues, carrying out reaction, and carrying out solid-liquid separation to obtain a filtrate containing fluorine and aluminum and insoluble residues.