Method for recycling multiple components of waste lithium iron phosphate battery

Abstract

The invention discloses a method for recycling multiple components of a waste lithium iron phosphate battery. The method comprises the following steps of breaking a shell of the discharged waste lithium iron phosphate battery, disassembling and separating, treating the battery core to obtain a solvent recovery solution, crushing and sorting the battery core to obtain lithium iron phosphate coarse powder, copper powder and aluminum powder, adding the lithium iron phosphate coarse powder into an acid solution to react, filtering to obtain an acid leaching solution and carbon residues, washing the carbon residues with water, and drying to obtain high-carbon graphite, adjusting the PH value of the acid leaching solution, adding a reducing agent to remove copper, and filtering to obtain a copper-removed solution and copper slag, adding an oxidizing agent and a proper amount of phosphorus source into the copper-removed solution to obtain ferric orthophosphate, adding alkali liquor into the iron precipitation liquid to obtain aluminum-removed liquid and aluminum slag, adding alkali liquor into the aluminum precipitation liquid to obtain alkalized liquid and alkaline slag, and evaporating and concentrating the alkalized solution to obtain a lithium-rich solution, and adding the lithium-rich solution into a sodium carbonate solution to obtain lithium carbonate. The invention relates to the technical field of battery recycling, and particularly provides a method for recycling multiple components of a waste lithium iron phosphate battery.

Description

technical field [0001] The invention relates to the technical field of battery recycling, in particular to a multi-component recycling method for waste lithium iron phosphate batteries. Background technique [0002] Driven by the new energy vehicle industry, our power battery industry has ushered in explosive growth. The shipment of power batteries has risen from 0.03GWh in 2009 to 57GWh in 2018, an increase of over a thousand times; as of the end of March 2020, The cumulative total output of new energy vehicles in my country exceeds 4.28 million, and the cumulative supporting capacity of power batteries is about 209GWh. The scale of the new energy vehicle industry ranks first in the world and shows a gradual growth trend. [0003] The lifespan of lithium power batteries is usually 5 to 8 years. The power batteries of new energy vehicles promoted in the early stage have been scrapped on a large scale. By the end of 2020, the cumulative decommissioned power batteries will reac...

AI Technical Summary

Problems solved by technology

High-performance lithium iron phosphate materials cannot be prepared without chemical removal of impurities

[0021] From the above method, it can be seen that the existing lithium iron phosphate waste battery recycling method has significant technical defects. The method of manually dismantling and obtaining the positive electrode sheet alone cannot meet the needs of large-scale production, and dismantling lithium batteries in the air is prone to fire Combustion and other accidents, at the same time, the electrolyte and solvent will decompose in humid air and cannot be recycled; so how to improve the dismantling efficiency of waste batteries, and at the same time use chemical methods such as wet methods to remove impurities, and use the active components of waste batteries as positive electrodes The form of raw materials to solidify is the main purpose of our new method