Method for preparing lithium carbonate by employing discarded lithium iron phosphate battery

A lithium iron phosphate battery and lithium carbonate technology, applied in lithium carbonate;/acid carbonate, battery recovery, recycling technology, etc., can solve the problem of low purity of lithium carbonate, low extraction efficiency, and high loss of lithium And other issues

Inactive Publication Date: 2016-11-16
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method comprises the following steps: roasting lithium iron phosphate waste at 500-800 DEG C for 1-4 hours; adding sulfuric acid to leaching the roasted material, and filtering to obtain a mixed solution of lithium phosphate, iron phosphate and iron sulfate; heating the mixed solution to 80-100 DEG C , and adjust the pH value to 2-2.5, react for 1-4 hours, filter, wash and dry to obtain iron phosphate; Sodium adjusts the pH value to 10-12, reacts for 0.5-2 hours, filters, washes, and dries to obtain battery-grade lithium carbonate, but this method loses a lot of lithium, the extraction efficiency of lithium is low, and the purity of the prepared lithium carbonate is not high

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  • Method for preparing lithium carbonate by employing discarded lithium iron phosphate battery

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Embodiment 1

[0036] A method for reclaiming and preparing lithium carbonate from scrapped lithium iron phosphate battery positive plates, comprising the following steps:

[0037] (1) Use a crusher to crush the scrapped positive electrode sheet into a block positive electrode sheet smaller than 6cm;

[0038] (2) Calcining the block-shaped positive electrode sheet at 600°C for 1 hour in a high-temperature furnace with a nitrogen atmosphere;

[0039] (3) Use vibrating sieve to vibrate and separate the calcined block positive electrode sheet to obtain positive electrode material and recycled aluminum foil;

[0040] (4) Grinding the obtained positive electrode material with a grinder until the particle size is below 75 μm;

[0041] (5) After grinding, the positive electrode material was mixed with 5mol / L sulfuric acid solution at a solid-to-liquid ratio of 1:6 (g:ml), and stirred and reacted at 70°C for 3 hours;

[0042] (6) Add a TOPO-kerosene extraction system with a volume ratio of 1:1 to ...

Embodiment 2

[0045] A method for reclaiming and preparing lithium carbonate from scrapped lithium iron phosphate battery positive plates, comprising the following steps:

[0046] (1) Use a crusher to crush the scrapped positive electrode sheet into a block positive electrode sheet smaller than 6cm;

[0047] (2) Calcinate the block-shaped positive electrode sheet at 500°C for 2 hours in a high-temperature furnace with a nitrogen atmosphere;

[0048] (3) Use vibrating sieve to vibrate and separate the calcined block positive electrode sheet to obtain positive electrode material and recycled aluminum foil;

[0049] (4) Grinding the obtained positive electrode material with a grinder until the particle size is below 75 μm;

[0050] (5) After grinding, the positive electrode material was mixed with 3mol / L sulfuric acid solution at a solid-to-liquid ratio of 1:12 (g:ml), and stirred and reacted at 90°C for 1 hour;

[0051] (6) Add TOPO-kerosene extraction system with a volume ratio of 3:1 to t...

Embodiment 3

[0054] A method for reclaiming and preparing lithium carbonate from scrapped lithium iron phosphate battery positive plates, comprising the following steps:

[0055] (1) Use a crusher to crush the scrapped positive electrode sheet into a block positive electrode sheet smaller than 6cm;

[0056] (2) Calcinate the block-shaped positive electrode sheet at 400°C for 3 hours in a high-temperature furnace with a nitrogen atmosphere;

[0057] (3) Use vibrating sieve to vibrate and separate the calcined block positive electrode sheet to obtain positive electrode material and recycled aluminum foil;

[0058](4) Grinding the obtained positive electrode material with a grinder until the particle size is below 75 μm;

[0059] (5) After grinding, the positive electrode material was mixed with 1mol / L sulfuric acid solution at a solid-to-liquid ratio of 1:15 (g:ml), and stirred and reacted at 80°C for 2 hours;

[0060] (6) Add a TOPO-kerosene extraction system with a volume ratio of 2:1 to...

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Abstract

The invention discloses a method for preparing lithium carbonate by employing a discarded lithium iron phosphate battery. The method comprises the steps of crushing a discarded positive pole piece into blocks; calcining the massive positive pole piece in a high temperature furnace into which nitrogen is introduced; carrying out vibrating separation on the calcined positive pole piece through a vibrating screen; grinding a positive pole material which is obtained through vibrating separation; carrying out mixing and stirring reaction on the ground positive pole material and an acid liquid at a certain ratio; adding a TOPO-kerosene extracting agent to an acid leaching liquid to extract lithium and then carrying out reverse extraction through a stripping agent to obtain a lithium solution; and adding a sodium carbonate solution to the lithium solution and carrying out precipitation to prepare lithium carbonate. By the method for preparing the lithium carbonate by employing the discarded lithium iron phosphate battery, the recovery technology is simple; the equipment investment is low; the environmental pollution is small; the lithium loss is small; the extraction efficiency on lithium is high; the prepared lithium carbonate is high in purity; and the method is suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of recycling waste lithium ion batteries, and in particular relates to a method for preparing lithium carbonate by using a waste lithium iron phosphate battery. Background technique [0002] Lithium iron phosphate is considered to be a positive electrode material with great development potential in the field of power batteries due to its excellent safety, environmental protection, cycle stability and high specific capacity. With the continuous rise of the new energy industry and the rapid development of the electric vehicle industry, the demand for lithium iron phosphate batteries has increased sharply. In 2015, the production and sales volume of electric vehicles in my country was 379,000. It is estimated that the number of electric vehicles in my country will reach 7 million in 2020. It can be predicted that the application prospects of lithium iron phosphate batteries will be very broad, and the consumpti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54C01D15/08
CPCY02W30/84H01M10/54C01D15/08
Inventor 马小路
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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