Recovery method and application of lithium iron phosphate waste

• Main Authors: XIA YANG, RUAN DINGSHAN, CHEN RUOKUI, QIAO YANCHAO, LI CHANGDONG, DUAN JINLIANG
• Format: Patent
• Language: Chinese; English
• Published: 17.08.2021
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS THEREOF; ELECTRICITY; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS; ORGANIC CHEMISTRY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention belongs to the technical field of battery recovery, and discloses a recovery method and application of lithium iron phosphate waste. The method comprises the following steps: mixing the lithium iron phosphate waste with water to prepare slurry, adding alkali to adjust the pH value to be alkaline, heating to react, filtering and separating to obtain filter residues; dissolving the filter residue in acid, filtering and separating, taking filtrate, adding a solution containing oxalate, reacting, aging, filtering and separating to obtain a filter cake and a precipitation mother solution; and pulping, washing and removing free water from the filter cake to obtain ferrous oxalate. The method comprises the following steps: adding the alkali to adjust the pH value, dissolving the filter residue with acid, carrying out solid-liquid separation, removing the filter residue, adding an oxalate-containing substance into the filtrate, heating and precipitating to obtain the ferrous oxalate precipitate. Compare