Method for recovering lithium from waste lithium batteries

A waste lithium battery, lithium recycling technology, applied in battery recycling, waste collector recycling, recycling technology, etc., can solve the problems of high processing cost, only about 50%, lithium recycling, etc., and achieve considerable economic benefits and separation effects good effect

Inactive Publication Date: 2017-09-29
HUNAN BRUNP RECYCLING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, some processes in the wet process cannot recover the lithium in it, which directly leads to the loss of lithium.
The process of recovering lithium in the prior art mostly adopts the method of fluoride salt precipitation or carbonate precipitation, wherein the recovery rate of fluoride salt precipitation is about 60%, and the treatment cost is high, while the recovery rate of carbonate precipitation is only about 50%. and face many technical problems

Method used

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  • Method for recovering lithium from waste lithium batteries
  • Method for recovering lithium from waste lithium batteries

Examples

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Embodiment 1

[0018] A method for reclaiming lithium from waste lithium batteries, comprising the following process steps:

[0019] 1) Heat-treat the positive electrode sheet of lithium cobaltate waste battery or the positive electrode sheet of leftover material to remove the binder, and then obtain the waste lithium cobaltate powder after physical crushing and screening process, and the content of main metal elements is shown in Table 1 below;

[0020] 2) Take 100g of waste lithium cobaltate powder, add 30g of elemental sulfur, mix evenly and place it at 500°C for anaerobic calcination to obtain metal sulfide and lithium compound;

[0021] 3) Cool the calcined material, add 400ml of pure water and stir evenly, so that the lithium compound reacts with water and dissolves in water, while the metal sulfide remains in the solid, and after being fully washed, filter to obtain a filter residue containing metal sulfide and a Lithium aqueous solution, drying the filter residue after washing, its p...

Embodiment 2

[0025] A method for reclaiming lithium from waste lithium batteries, comprising the following process steps:

[0026] 1) Heat-treat the positive electrode sheet of nickel-cobalt lithium manganese oxide waste battery (type 111) or scrap positive electrode sheet to remove the binder, and then undergo physical crushing and screening to obtain waste nickel-cobalt lithium manganese oxide powder, in which the main metal elements The content is shown in Table 2 below;

[0027] 2) Take 100g of waste nickel-cobalt-lithium manganese oxide powder, add 100g of sodium sulfide, mix well, place it at 300°C for anaerobic calcination, and obtain metal sulfide and lithium compound;

[0028] 3) Cool the calcined material, add 300ml of pure water and stir evenly, so that the lithium compound reacts with water and dissolves in water, while the metal sulfide remains in the solid, and after being fully washed, filter to obtain the filter residue containing metal sulfide and containing Lithium aqueo...

Embodiment 3

[0032] A method for reclaiming lithium from waste lithium batteries, comprising the following process steps:

[0033] 1) Heat-treat the positive electrode sheet of nickel-cobalt lithium manganese oxide waste battery (high nickel type) or scrap positive electrode sheet to remove the binder, and then obtain waste nickel-cobalt lithium manganese oxide powder after physical crushing and screening process, in which the main metal The element content is shown in Table 3 below;

[0034] 2) Take 100g of waste nickel-cobalt-lithium manganese oxide powder, add 120g of pyrite powder, mix evenly and place it at 700°C for anaerobic calcination to obtain metal sulfide and lithium compound;

[0035] 3) Cool the calcined material, add 250ml of pure water and stir evenly, so that the lithium compound reacts with water and dissolves in water, while the metal sulfide remains in the solid, and after being fully washed, filter to obtain a filter residue containing metal sulfide and a Lithium aque...

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Abstract

The invention discloses a method for recovering lithium from waste lithium batteries. The method comprises the following steps: subjecting the positive electrode materials of waste lithium batteries and a sulfuration agent, carrying out calcining and then carrying out solid-liquid separation so as to separate a lithium-containing aqueous solution. According to the invention, the sulfuration-calcining method is employed for recovery of the lithium-containing aqueous solution; in the lithium-containing aqueous solution having undergone filtering once, the concentration of lithium is 15 g/L or above; the total recovery rate of lithium is as high as 97.43% or above; and good separation effect on lithium and nickel-cobalt-manganese is obtained. The method provided by the invention is applicable to comprehensive recovery of waste batteries, suitable for large-scale production and free of environmental pollution, and produces considerable economic benefits.

Description

technical field [0001] The invention relates to the field of waste battery recovery, in particular to a method for recovering lithium from waste lithium batteries. Background technique [0002] At present, the main recovery method of waste lithium batteries is wet recovery, that is, the positive electrode powder is obtained by mechanical means, and then the positive electrode powder is dissolved with acid, and then the chemical precipitation method, salting out method, ion exchange method, solvent extraction method, electrochemical method are used. Valuable metals in it can be recovered by law. However, some processes in the wet process cannot recover the lithium in it, which directly leads to the loss of lithium. The process of recovering lithium in the prior art mostly adopts the method of fluoride salt precipitation or carbonate precipitation, wherein the recovery rate of fluoride salt precipitation is about 60%, and the treatment cost is high, while the recovery rate of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54
CPCH01M10/54Y02W30/84
Inventor 乔延超唐红辉陈若葵谭群英
Owner HUNAN BRUNP RECYCLING TECH
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