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Method for selectively recycling lithium from lithium iron phosphate waste

A lithium iron phosphate and lithium recovery technology, applied in the field of selective lithium recovery, can solve the problems of increasing the difficulty of high-purity lithium products, and achieve the effects of low reagent cost, short process and mild reaction conditions

Active Publication Date: 2017-06-30
GUANGDONG GUANGHUA SCI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the obtained leaching solution contains phosphate groups, which increases the difficulty of subsequent preparation of high-purity lithium products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Add 158g of expired lithium iron phosphate cathode powder into water to make slurry, then add 0.6mol sodium persulfate to the aqueous solution and perform mechanical stirring. The reaction conditions are controlled as follows: solid-liquid ratio 1:2kg / L, reaction temperature 25°C, The time is 1 hour, and the pH is about 2.5 during the process, without adding acid or alkali to control. After the reaction was completed, the lithium-containing aqueous solution and iron phosphate solid were obtained by filtration. The concentration of lithium in the solution was 21.9 g / L, and the leaching rate was 99.3%. Add 200g / L Na to the leaching solution 2 CO 3 The solution is subjected to lithium precipitation, and the precipitate is filtered, washed and dried to obtain white crystals, and the purity of lithium carbonate reaches 99.5%.

Embodiment 2

[0018] Discharge and crush the used lithium iron phosphate battery soft pack, weigh 1000g (containing 289g of lithium iron phosphate powder) and add it into water to make slurry, then inject oxygen into the aqueous solution, and carry out mechanical stirring. The reaction conditions are controlled as follows: oxygen flow rate 1L / min, solid-liquid ratio 1:1.5kg / L, reaction temperature 38°C, time 10 hours, pH 10.0 or so. After the reaction was completed, the lithium-containing aqueous solution and iron phosphate solid were obtained by filtration. The concentration of lithium in the solution was 8.4g / L, and the leaching rate was 98.4%. After heating and evaporating the leaching solution to increase the concentration of lithium in it, CO is introduced 2 Lithium precipitation is carried out, and the precipitate is filtered, washed, and dried to obtain white crystals, and the purity of lithium carbonate reaches 99.6%.

Embodiment 3

[0020] Break the waste lithium iron phosphate positive electrode sheet to less than 1cm, weigh 800g (containing 450g of lithium iron phosphate) and add it into water to make slurry, then pass ozone into the aqueous solution, and carry out mechanical stirring. The reaction conditions are controlled as follows: ozone flow rate 1mol / h. The solid-to-liquid ratio is 1:5kg / L, the reaction temperature is 50°C, the reaction time is 5 hours, and the pH is about 11.0. After the reaction was completed, the lithium-containing aqueous solution and iron phosphate solid were obtained by filtration. The concentration of lithium in the solution was 4.9 g / L, and the leaching rate was 98.3%. The leaching solution is heated and evaporated, and the crystallized product obtained is a product containing 98.6% of lithium hydroxide after being filtered, washed and dried.

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Abstract

The invention discloses a method for selectively recycling lithium from lithium iron phosphate waste through a direct oxidization method. The method is characterized by comprising the steps that the lithium iron phosphate waste is added into a water solution, meanwhile, an oxidizing agent is added, stirring is carried out, lithium iron phosphate and the oxidizing agent react to generate iron phosphate, lithium ions enter the solution, and therefore a pure lithium-containing solution and iron phosphate solids are obtained. The adopted oxidizing agent comprises one or a mixture of persulfate, ozone, oxygen, pypocholoride and hydrogen peroxide. The molar weight of the oxidizing agent is 0.6-20 times that of lithium iron phosphate. The lithium-containing solution can be directly used for preparing a high-purity lithium product. According to the method, efficient and selective leaching of lithium can be achieved simply by adding a certain amount of oxidizing agent, and the method is mild in reaction condition, short in process and simple in equipment.

Description

technical field [0001] The invention relates to a method for selectively recovering lithium from lithium iron phosphate waste, and belongs to the fields of electronic waste recycling and resource utilization. Background technique [0002] In recent years, under the background of the era of green and environmental protection, my country's new energy vehicles have experienced rapid growth. Lithium iron phosphate power batteries are widely used in power vehicles, energy storage power stations and other fields due to their excellent safety, stability and cycle performance, low price and no pollution. With the continuous improvement of production capacity, the number of waste lithium iron phosphate batteries is increasing, and the resulting resource shortage and environmental problems are becoming more and more serious. Therefore, it is of great practical significance to develop a clean and efficient method for treating lithium iron phosphate battery waste. [0003] The more tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54C22B26/12C22B7/00
CPCC22B7/00C22B26/12H01M10/54Y02P10/20Y02W30/84
Inventor 张家靓王成彦胡军涛
Owner GUANGDONG GUANGHUA SCI TECH
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