Method for recovering iron and phosphorus in waste lithium iron phosphate battery

• Main Authors: WANG ZHONGCHAO, CHEN JIAQI, ZHANG HAO, LI BOQIU, YANG JING, MAO SHUYAN, HU YAN
• Format: Patent
• Language: Chinese; English
• Published: 21.06.2024
• Subjects: ARTIFICIAL STONE; CEMENTS; CERAMICS; CHEMISTRY; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; COMPOUNDS THEREOF; CONCRETE; INORGANIC CHEMISTRY; LIME, MAGNESIA; MANUFACTURE OF IRON OR STEEL; METALLURGY; METALLURGY OF IRON; NON-METALLIC ELEMENTS; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; REFRACTORIES; SEPARATION; SLAG; TRANSPORTING; TREATMENT OF NATURAL STONE

The invention discloses a method for recycling iron and phosphorus in waste lithium iron phosphate batteries, and belongs to the technical field of lithium battery recycling. The invention provides a process for efficiently separating phosphorus and iron elements in the ferrophosphorus slag by using a salt-assisted carbon thermal reduction-water leaching method and recovering a Fe product from the ferrophosphorus slag, and the comprehensive recovery rate of iron by using the process disclosed by the invention is as high as 99.3%. Lithium sulfonate and ferrocene are introduced into the sheet-type zirconia ceramic nanofiltration membrane through a chemical reaction, the compatibility with fine suspended particles containing lithium and iron can be improved, the content of metal impurities in the filtrate can be reduced, efficient separation of iron and phosphorus in the ferrophosphorus slag can be improved, the metal content in the filtrate is lower than 8%, and the minimum metal content can reach 0.06%. 本发明公开了