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Method for preparing battery grade lithium carbonate by recovering lithium from lithium iron phosphate waste battery

A technology for lithium ferrous phosphate and waste batteries, applied in battery recycling, waste collector recycling, lithium carbonate;/acid carbonate, etc., can solve the problems of low lithium yield, low product purity, and product impurity content Advanced problems, to achieve the effect of improving lithium recovery rate, high product purity, and high lithium recovery rate

Active Publication Date: 2017-05-31
GANFENG LITHIUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has a large amount of slag, low production efficiency, less than 60% lithium yield, and low product purity
The main problems of this method are that the iron-lithium powder roasting process has a lot of dust, the total yield of lithium is low, and the product quality is poor (calcium, phosphorus impurities are high) and other shortcomings.
[0006] How to solve the problems of large dust, low lithium yield and high impurity content in the roasting process of lithium iron phosphate powder is the main difficulty in the current research on lithium extraction from lithium iron phosphate waste batteries, and it is also the main technology to be solved by the patent of the present invention question

Method used

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  • Method for preparing battery grade lithium carbonate by recovering lithium from lithium iron phosphate waste battery
  • Method for preparing battery grade lithium carbonate by recovering lithium from lithium iron phosphate waste battery
  • Method for preparing battery grade lithium carbonate by recovering lithium from lithium iron phosphate waste battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] A. Battery dismantling: Lithium ferrous phosphate powder is separated from lithium iron phosphate waste batteries through discharging, dismantling, sorting, crushing and other processes;

[0054] B. disc granulation: take by weighing the lithium iron phosphate powder 100.0kg that step A separates, analyze wherein lithium content is 3.8%, add the magnesium chloride solution of 20.0kg 10.0% (wt%) in the lithium iron phosphate powder, stir 30min, then carry out disc granulation, the average particle size is 10.0mm;

[0055] C. High-temperature roasting: roast the granulated material in step B at 600°C for 3 hours, and continuously blow in air during the roasting process;

[0056] D. Acidification leaching: the material after roasting is first added with water to adjust slurry, and adding 64.0Kg of hydrochloric acid with a weight ratio of 31.0%, leaching at normal temperature for 30min, keeping the pH value of the material at 1.0, obtaining iron phosphate, lithium phosphate...

Embodiment 2

[0061] A. Battery dismantling: Lithium ferrous phosphate powder is separated from lithium iron phosphate waste batteries through discharging, dismantling, sorting, crushing and other processes;

[0062] B. disc granulation: take by weighing the lithium iron phosphate powder 100.0kg that step A separates, analyze wherein lithium content is 3.6%, add the magnesium sulfate solution of 12.5kg 15.0% (wt%) in the lithium iron phosphate powder, Stir for 60min, then carry out disk granulation, the average particle size is 5.0mm;

[0063] C. High-temperature roasting: roast the granulated material in step B at 500°C for 4 hours, and continuously blow in oxygen during the roasting process;

[0064] D. Acidification leaching: the material after roasting is first added with water to adjust slurry, and adding 38.0Kg of sulfuric acid with a weight ratio of 98%, leaching at normal temperature for 60min, keeping the pH value of the material at 0.5, obtaining ferric phosphate, lithium phosphat...

Embodiment 3

[0069] A. Battery dismantling: Lithium ferrous phosphate powder is separated from lithium iron phosphate waste batteries through discharging, dismantling, sorting, crushing and other processes;

[0070] B. disc granulation: take by weighing the lithium iron phosphate powder 100.0kg that step A separates, analyze wherein lithium content is 3.4%, add the magnesium nitrate solution of 25kg 5.0% (wt%) in the lithium iron phosphate powder, stir 45min, then disc granulation, the average particle size is 20.0mm;

[0071] C. High-temperature roasting: roast the granulated material in step B at 800°C for 1 hour, and continuously blow air into it during the roasting process;

[0072] D. Acidification leaching: add water to the material after roasting, and add 28.3Kg of nitric acid with a weight ratio of 65%, leaching for 45min at normal temperature, keeping the pH value of the material at 1.5, obtaining ferric phosphate, lithium phosphate, Lithium-containing solution mixed with ferric ...

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Abstract

The invention relates to a method for preparing battery grade lithium carbonate by recovering lithium from a lithium iron phosphate waste battery. The lithium iron phosphate waste battery is taken as a raw material to prepare the battery grade lithium carbonate. The method comprises the following steps: (1) carrying out battery disassembling; (2) carrying out disk granulation; (3) carrying out high-temperature roasting; (4) carrying out acidification leaching; (5) carrying out deep transition; (6) carrying out alkalization edulcoration; (7) carrying out lithium deposition by sodium carbonate. The method has the beneficial effects that the method for preparing the battery grade lithium carbonate by recovering the lithium from the lithium iron phosphate waste battery has the advantages of high recovery rate, environment friendliness, high product purity and the like, the main content of a product exceeds 99.5%, and meets battery grade product requirements, and the method has the characteristics of simple technology and low production cost and is suitable for industrial production.

Description

technical field [0001] The invention relates to a method for recycling lithium waste batteries, in particular to a method for recovering lithium from lithium ferrous phosphate waste batteries to prepare battery-grade lithium carbonate. Background technique [0002] Due to the advantages of high specific energy, long service life, high rated voltage, high power endurance, low self-discharge rate, light weight, and high and low temperature adaptability, lithium-ion batteries have become a popular choice for digital, communication, aviation, and portable electronic products. preferred power source. With its popularization and application in power vehicles and high-power energy storage facilities, its demand will grow explosively. In 2015, the global lithium-ion battery production reached 100.75GWh, of which small batteries accounted for 66.28%, power batteries accounted for 28.26%, and energy storage batteries accounted for 5.46%. In 2015, my country's lithium-ion battery pro...

Claims

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Application Information

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IPC IPC(8): H01M10/54C01D15/08
CPCY02W30/84H01M10/54C01D15/08C01P2006/80
Inventor 李良彬白有仙谢绍忠高贵彦章小明刘超彭爱平李芳芳刘明
Owner GANFENG LITHIUM CO LTD
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