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Process for selectively recovering lithium in waste lithium iron phosphate battery by means of mechanochemical activation method

A lithium iron phosphate battery, mechanochemical technology, applied in battery recycling, recycling technology, waste collector recycling, etc., can solve the problems of cumbersome process, secondary pollution, slow process, etc., achieve low reaction temperature, and realize reuse , the effect of easy operation

Inactive Publication Date: 2020-02-07
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the traditional hydrometallurgical process such as slowness, low leaching rate, cumbersome process, high cost, and secondary pollution, and develop a method that can be simple, fast, high leaching rate, no secondary pollution, and environmentally friendly. Realize highly selective leaching of lithium, and recover phosphorus and iron in situ at the same time, and realize resource recycling of waste lithium iron phosphate batteries with added value

Method used

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  • Process for selectively recovering lithium in waste lithium iron phosphate battery by means of mechanochemical activation method
  • Process for selectively recovering lithium in waste lithium iron phosphate battery by means of mechanochemical activation method
  • Process for selectively recovering lithium in waste lithium iron phosphate battery by means of mechanochemical activation method

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Embodiment 1

[0022] according to figure 1 Flowchart, the positive electrode sheet is collected after the waste lithium iron phosphate battery is discharged, and the positive electrode sheet is cut into 4*2cm small strips with scissors, placed in a tube furnace under a nitrogen atmosphere at 360°C for 2 hours, and then taken out to obtain aluminum foil and positive electrode materials; With cathode material LiFePO 4 As a raw material, add an appropriate amount of water and a stoichiometric co-grinding agent for mechanochemical activation treatment, grind at a speed of 600rpm for 30min, then transfer to a round-bottomed Erlenmeyer flask, add 4vol.% leaching agent solution, and carry out solidification after leaching for 60min. Liquid separation and collection of leaching liquid and leaching residue ( figure 2 ); the leaching solution was evaporated at 105°C for several hours, and the remaining appropriate amount of lithium-containing solution was moved to a water bath with a water temperat...

Embodiment 2

[0024] according to figure 1 Flowchart, the positive electrode sheet is collected after the waste lithium iron phosphate battery is discharged, and the positive electrode sheet is cut into 4*2cm small strips with scissors, placed in a tube furnace under a nitrogen atmosphere at 360°C for 2 hours, and then taken out to obtain aluminum foil and positive electrode materials; With cathode material LiFePO 4 As a raw material, add an appropriate amount of water and a stoichiometric compound co-grinding agent for mechanochemical activation treatment, wherein the molar ratio of lithium iron phosphate to co-grinding agent is 1:0.5:0.5, grind at 600rpm for 30min and then transfer to a circular Bottom Erlenmeyer flask, add 4vol.% leaching agent solution, leaching for 60 minutes, then carry out solid-liquid separation to collect the leaching solution and leaching residue; the leaching solution evaporates water at 105°C for a few hours, and the remaining appropriate amount of lithium-conta...

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Abstract

The invention provides a process for selectively recovering lithium in waste lithium iron phosphate battery by means of a mechanochemical activation method, and belongs to a new solid waste reclamation technology in the field of environmental protection and resource comprehensive utilization. According to the process, the core principle is to carry out mechanical activation in the first place, sothat an excellent activation effect can be achieved through adding an inter-grinding agent; and then a composite leaching agent is used for selectively leaching the lithium in a positive electrode material of an lithium iron phosphate battery into a solution, at the moment, lithium and iron are completely separated while iron and phosphorus, together with carbon powder, enter leaching residue in the form of iron phosphate precipitate, so that in-situ recovery of iron and phosphorus is achieved. The process has the characteristics of short flow, simple operation, low energy consumption, environmental friendliness, no secondary pollution and a wide application prospect.

Description

technical field [0001] The invention relates to a method for the harmless treatment of waste lithium iron phosphate power batteries and the recovery of valuable elements, which belongs to the new technology of solid waste recycling in the field of environmental protection and comprehensive utilization of resources, and is especially suitable for lithium in various lithium-containing waste batteries. selective recycling. Background technique [0002] Lithium iron phosphate batteries have the advantages of high specific energy density and good cycle performance, and are widely used in electric vehicles, hybrid electric vehicles and other vehicles as power sources. With the rapid development of the new energy automobile industry, the limited service life of power batteries has led to the decommissioning of a large number of waste lithium iron phosphate batteries. Clean recovery of valuable metals, especially strategic metal lithium, has important resource and economic benefits....

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B26/12H01M10/54
CPCC22B7/006C22B26/12H01M10/54Y02P10/20Y02W30/84
Inventor 张付申阿来拉姑张聪聪
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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