Method for recovering waste lithium iron phosphate battery positive pieces

A technology of lithium iron phosphate battery and recycling method, which is applied in the direction of battery recycling, waste collector recycling, recycling technology, etc., to achieve the effect of reducing environmental pollution problems

Active Publication Date: 2013-09-04
STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At home and abroad, most of the research on the recycling of waste lithium batteries is about lithium-ion secondary batteries for small digital products such as lithium cobalt oxide system. In recent years, lithium iron phosphate batteries have developed rapidly, and the research on the recovery and extraction process of lithium iron phosphate batteries is the first time.

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  • Method for recovering waste lithium iron phosphate battery positive pieces

Examples

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Effect test

Embodiment 1

[0026] Disassemble the lithium iron phosphate battery, take out the positive electrode, weigh 11.8564 grams, heat at 200°C for 4 hours, put the pretreated positive electrode waste in a beaker, add 250ml of NaOH to soak, and dissolve the positive aluminum foil completely within 4 hours. And the separation from the surface coating layer; after filtering the above, add a certain amount of acid in the filtrate to leach Al, and use Al(OH) 3 Precipitated in the form; the solid residue of the filter was dissolved in the mixed acid solution of sulfuric acid + hydrochloric acid, iron existed in the solid in the form of ferric phosphate, and lithium entered the solution as an ion component, stirred at 50°C for 12 hours; filtered, the filtrate contained lithium ions, Add saturated sodium carbonate at 95°C, lithium is precipitated as lithium carbonate solid, and hydrochloric acid is added to the filter residue, and iron enters the solution in the form of ions to realize separation from sol...

Embodiment 2

[0028] Disassemble the lithium iron phosphate lithium battery, take out the positive electrode, weigh 12.3321 grams, heat at 300°C for 3 hours, put the pretreated positive electrode waste in a beaker, add 250ml of NaOH to soak, and the positive aluminum foil is completely dissolved in 4 hours , and separate from the surface coating layer; after filtering the above, add a certain amount of acid to the filtrate to leach Al, and use Al(OH) 3 Precipitated in the form; the solid residue of the filter was dissolved in the mixed solution of sulfuric acid + bromic acid, iron existed in the solid in the form of ferric phosphate, and lithium entered the solution as an ion component, stirred at 50°C for 12 hours; filtered, the filtrate contained lithium ions, Add saturated sodium carbonate at 95°C, lithium is precipitated as solid lithium carbonate, nitric acid is added to the filter residue, iron enters the solution in the form of ions, and is separated from solid impurities, stirred at ...

Embodiment 3

[0030] Disassemble the lithium iron phosphate battery, take out the positive electrode, weigh 11.2381 grams, heat in a high-temperature furnace at 350°C for 2.5 hours, put the pretreated positive electrode waste in a beaker, add 250ml of NaOH to soak, and leave the positive electrode aluminum foil for 4 hours Completely dissolve and separate from the surface coating layer; after filtering the above, add a certain amount of acid to the filtrate to leach Al, and use Al(OH) 3 Precipitated in the form; the solid residue of the filter was dissolved in the mixed acid solution of hydrochloric acid + hydrogen peroxide, iron existed in the solid in the form of ferric phosphate, and lithium entered the solution as an ion component, stirred at 50°C for 12 hours; filtered, the filtrate contained lithium ions, add saturated sodium carbonate at 95°C, lithium is precipitated as lithium carbonate solid, nitric acid is added to the filter residue, iron enters the solution in the form of ions, a...

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Abstract

The invention discloses a method for recovering Al, Fe and Li in waste lithium iron phosphate battery positive pieces through an acid-alkali leaching process. The method comprises the following steps: dismounting the lithium iron phosphate battery positive pieces, dissolving the positive pieces by using an alkali, filtering, and dissolving obtained filter residues by a mixed acid solution for making Fe exist in an iron phosphate precipitate form and be separated from impurities comprising carbon black and the like and a lithium-containing solution; adding the lithium-containing solution to a 95DEG C saturated sodium carbonate solution for precipitation to obtain lithium carbonate; and adding an acid to obtain an iron-containing precipitate for leaching iron ions, and adding an alkaline solution to obtain Fe(OH)3. Al, Fe and Li in the waste lithium iron phosphate battery positive pieces are simply and effectively recovered through using low-concentration acids and alkalis and routine chemicals, and raw materials having economic benefits are recovered through using simple and effective equipment and the method.

Description

technical field [0001] The invention relates to a method for recovering the positive electrode waste sheet of lithium iron phosphate waste battery by an acid-base leaching method, in particular to a method for recovering aluminum, iron and lithium in the positive electrode waste sheet of lithium iron phosphate waste battery by the acid-base leaching method. Background technique [0002] Lithium-ion batteries have the advantages of long cycle life, high specific energy, stable discharge voltage, small size, and no memory effect. Lithium-ion batteries can be used in portable devices, satellites, reserve power, electric vehicles and other fields, and have broad development prospects. In 2010, the market size of lithium-ion batteries in my country reached 27.61 billion yuan, an increase of 37.9% over 2009. It is estimated that the global shipment of lithium-ion batteries will reach 3.99 billion pieces in 2013, and the growth momentum of the lithium-ion battery market will remai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54C22B7/00
CPCY02P10/20Y02W30/84
Inventor 贾蕗路吴越裴锋伍发元刘晓磊皮元丰毛荣军朱小勇
Owner STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST
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