Recycling device and recycling method for positive electrode material of waste lithium iron phosphate battery

• Main Authors: HU MINYI, WANG CHANG, SUN HAO, ZHANG SHUQIONG, GE JIANHUA, OUYANG QUANSHENG, CHEN XUE, ZHOU WEI, JIANG GUANGHUI, ZHAO QUNFANG
• Format: Patent
• Language: Chinese; English
• Published: 25.07.2023
• Subjects: APPARATUS THEREFOR; BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS THEREOF; ELECTRICITY; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTIONOF COMPOUNDS OR NON-METALS; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention discloses a recovery device and a recovery method of a waste lithium iron phosphate battery positive electrode material, an anode area and a cathode area are arranged in an electrolytic bath, oxygen is conveyed to the anode area and the cathode area through an oxygen filling pipe, the anode area is subjected to a coupling oxidation reaction, and lithium iron phosphate is jointly leached through oxygen oxidation and electrooxidation; according to the method, high-efficiency leaching of the waste lithium iron phosphate material is achieved, valuable metal is recycled through oxygen reduction of a cathode, generation of by-products is reduced, lithium in the waste lithium iron phosphate material can be removed in the electrolysis process and enters a cathode area through a cation diaphragm, lithium is combined with hydroxyl ions in cathode electrolyte, lithium hydroxide is generated, and the waste lithium iron phosphate material is recycled. Filter residues in the anode region contain iron phosphat