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Method for recycling metal in waste lithium iron phosphate batteries

A technology for lithium iron phosphate batteries and waste batteries, applied in battery recycling, waste collector recycling, recycling technology and other directions, can solve the problems of limited practical application, high energy consumption process, long process flow, etc., to simplify the recycling process, The effect of high efficiency and a wide range of pharmaceutical sources

Inactive Publication Date: 2017-08-04
SINO SCI PROCESS BEIJING SCI&TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Based on the current recovery process of hydrometallurgy or pyrometallurgy, although it is possible to recycle lithium iron phosphate batteries and obtain various products such as lithium iron phosphate cathode materials or lithium carbonate, the direct preparation of lithium iron phosphate cathode materials by warm calcination is often a technical process. long, requires strict control of reaction conditions, and requires high-energy-consuming processes to assist production, so the practical application is very limited

Method used

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  • Method for recycling metal in waste lithium iron phosphate batteries

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Effect test

Embodiment 1

[0063] (1) Break the positive electrode material of the waste lithium iron phosphate battery into pieces of 1~20mm×1~20mm, and roast at 800°C for 2 hours. During the roasting process, CaO can be sprayed to prevent the generation of fluorine-containing gas. The mass ratio of body is controlled at 300:1. After the calcination, metals such as aluminum and copper are removed by sieving to obtain lithium-containing powder.

[0064] Table 1 Composition of lithium-containing powder obtained by roasting and sorting lithium iron phosphate batteries (wt%)

[0065] Fe P Li 23.2 12.4 2.1

[0066] (2) The battery material powder containing aluminum, iron, and lithium obtained by roasting and sorting waste batteries is added to NaOH alkali solution to dissolve aluminum and aluminum oxides to obtain iron-containing lithium residues. The concentration of NaOH lye is 2mol / L.

[0067] (3) The obtained iron-containing lithium-containing residue is ball milled to obtain ...

Embodiment 2

[0072] Table 2 Composition of lithium-containing powder obtained by roasting and sorting lithium iron phosphate batteries (wt%)

[0073] Fe P Li 27.2 14.4 3.1

[0074] (2) The battery material powder containing aluminum, iron and lithium obtained by roasting and sorting the waste battery is added to the Ca(OH) 2 In the alkaline solution, aluminum and aluminum oxides are dissolved to obtain a residue containing iron and lithium. Ca(OH) 2 The concentration of lye is 2mol / L.

[0075] (3) The obtained iron-containing lithium-containing residue is ball milled to obtain iron-containing lithium-containing powder passed through a 200-mesh sieve, and the ball milling time is 2 hours.

[0076] (4) The obtained lithium-containing powder is intensively leached in a mixed solution of ammonium salt and ammonia, the ammonium salt concentration is 3mol / L, the leaching S / L is 80g / L, the leaching temperature is 40°C, the leaching time is 20min, and the leaching is st...

Embodiment 3

[0079] (1) Break the positive electrode material of the waste lithium iron phosphate battery into pieces of 1~20mm×1~20mm, roast at 800°C for 2 hours, and spray CaCO during the roasting process 3 To prevent the generation of fluorine-containing gas, the mass ratio of battery waste to calcium-containing powder is controlled at 300:1. After the calcination, metals such as aluminum and copper are removed by sieving to obtain lithium-containing powder.

[0080] Table 3 Composition of lithium-containing powder obtained by roasting and sorting lithium iron phosphate batteries (wt%)

[0081] Fe P Li 23.5 10.1 1.7

[0082] (2) The battery material powder containing aluminum, iron and lithium obtained by roasting and sorting the waste battery is added to the Ca(OH) 2 In the alkaline solution, aluminum and aluminum oxides are dissolved to obtain a residue containing iron and lithium. Ca(OH) 2 The concentration of lye is 2mol / L.

[0083] (3) The obtained iron-...

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Abstract

The invention provides a method for recycling metal in waste lithium iron phosphate batteries. The method comprises the following steps: roasting and sorting the waste lithium iron phosphate batteries to obtain lithium-containing positive electrode powder; carrying out enhanced leaching on the lithium-containing powder in a mixed solution of ammonium salt and / or ammonia; converting divalent iron into trivalent iron in an oxidative environment and forming sediment, so as to obtain a lithium-containing solution; and filtering the lithium-containing solution and preparing a high-purity lithium product, so as to obtain high-value products including lithium hydroxide or lithium carbonate and the like. Compared with a traditional wet-process acid leaching process, an acidic leaching agent is not used any more so that a condition that a lot of high-salt wastewater is generated is avoided; the lithium element is selectively leached in an enhanced leaching manner; the leaching efficiency is high and the consumption amount of a leaching solution is small; a high-purity lithium-containing solution can be obtained; finally, the purity of the obtained lithium products is high and a flow is short; chemical agents have a wide source and technological conditions are simple; the lithium element can be selectively leached in the enhanced leaching manner and the high-purity lithium products are harvested; and the recycling benefits of the waste lithium iron phosphate batteries are improved and the method has a good industrial application prospect.

Description

technical field [0001] The invention belongs to the technical field of recycling of secondary resources and circular economy, and in particular relates to a method for recycling metals in waste lithium iron phosphate batteries. Background technique [0002] Under the dual pressure of energy saving and emission reduction, new energy vehicles have become the direction of the future development of the automobile industry. With the vigorous promotion of the government, the new energy automobile industry will enter the rapid development stage from the initial stage. As one of the most critical components of new energy vehicles, the demand for power batteries is growing rapidly. Among them, lithium iron phosphate batteries are widely used in new energy vehicles due to their high theoretical capacity, good discharge platform, excellent cycle stability and low price. Reasonable recycling of waste lithium iron phosphate materials will promote the development of the new energy autom...

Claims

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Application Information

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IPC IPC(8): H01M10/54C22B1/02C22B7/00C22B26/12
CPCC22B1/02C22B7/008C22B26/12H01M10/54Y02W30/84Y02P10/20
Inventor 王雪
Owner SINO SCI PROCESS BEIJING SCI&TECH CO LTD
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