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Method for recovering lithium in waste and old lithium iron phosphate batteries

A lithium iron phosphate battery and lithium recovery technology, applied in battery recycling, waste collector recycling, recycling technology, etc., can solve the problems of large acid consumption, leachate containing impurities and high-salt wastewater, etc.

Active Publication Date: 2017-06-13
SINO SCI PROCESS BEIJING SCI&TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above-mentioned methods of wet leaching and recovery of lithium elements, both iron and lithium elements are leached at the same time, and then further separation of iron and lithium elements often consumes a large amount of acid solution, accompanied by impurities in the leaching solution and a large amount of high-salt wastewater.

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  • Method for recovering lithium in waste and old lithium iron phosphate batteries

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (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.

[0038] Table 1 Composition of lithium-containing powder obtained by roasting and sorting lithium iron phosphate batteries (wt%)

[0039] Fe P Li 25.7 14.4 3.2

[0040] (2) The obtained positive electrode powder is added to the Ca(OH)-containing 2 Alkaline suspension, oxygen is introduced during the reaction (the volume ratio of oxidant / positive electrode powder solution is 10), iron and phosphate are converted into water-insoluble compounds, and lithium is converted into water-soluble lithium hydroxide . The mass concentration of calc...

Embodiment 2

[0044](1) Break the positive electrode material of the waste lithium iron phosphate battery into pieces of 1~20mm×1~20mm, and roast at 1000°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.

[0045] Table 2 Composition of lithium-containing powder obtained by roasting and sorting lithium iron phosphate batteries (wt%)

[0046] Fe P Li 19.2 8.7 1.7

[0047] (2) The obtained positive electrode powder is added to the Ca(OH)-containing 2 Alkaline suspension, while adding KMnO 2 Solution (positive electrode powder solution / KMnO 2 Solution mass ratio 20, KMnO 2 The solution concentration is 10%), converting iron and phosphate into water-insoluble compounds, and converting lithium into water-soluble lithium hydroxide. The mass ...

Embodiment 3

[0051] (1) Break the positive electrode material of the waste lithium iron phosphate battery into pieces of 1~20mm×1~20mm, roast at 1200°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.

[0052] Table 3 Composition of lithium-containing powder obtained by roasting and sorting lithium iron phosphate batteries (wt%)

[0053] Fe P Li 23.1 10.5 2.1

[0054] (2) The obtained positive electrode powder is added to the Ca-containing solution, and H 2 o 2 Solution (positive electrode powder solution / H 2 o 2 Solution mass ratio 30, H 2 o 2 The solution concentration is 15%), converting iron and phosphate into water-insoluble compounds, and converting lithium into water-soluble lithium hydroxide...

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Abstract

The invention provides a method for efficiently recovering lithium in waste and old lithium iron phosphate batteries. The method comprises that waste and old lithium iron phosphate batteries are roasted and sorted to form lithium-containing positive pole powder, lithium-containing positive pole powder and a calcium-containing alkaline solution undergo a reaction under conditions of oxidation so that iron and phosphate radical are converted into a water-insoluble compound and lithium is converted into water soluble lithium hydroxide, and the reaction products are filtered so that a lithium hydroxide solution is obtained and can be used for further preparation of lithium hydroxide or lithium carbonate products. The method replaces the conventional wet acid leaching method in waste and old lithium iron phosphate battery recovery and is free of a strong acid so that production of a large amount of high-salt waste water is avoided. The method realizes selective leaching of lithium, prevents iron impurities from entering the leaching liquid from the source, can produce a high-purity lithium product, has simple processes, utilizes chemical agents having wide sources, has simple process conditions, can prepare a high-purity lithium product through a one-step method, greatly improves recovery efficiency of waste and old lithium iron phosphate batteries and has a good industrial application prospect.

Description

technical field [0001] The invention belongs to the technical field of recycling secondary resources and circular economy, and in particular relates to a method for recovering lithium from waste lithium iron phosphate batteries. Background technique [0002] Energy and the environment are growing concerns. With the depletion of oil resources and the increasing harm of air pollution caused by vehicle exhaust emissions, electric vehicles and hybrid electric vehicles have attracted the attention of governments and automobile companies in various countries. With the development of electric vehicles, lithium iron phosphate batteries have been widely used due to their advantages such as rich raw material resources, low price, no pollution to the environment, stable structure and good thermal stability. With the extensive use of lithium iron phosphate batteries, the recycling of used batteries has become a new task. Recycling can not only reduce the impact of used batteries on the...

Claims

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Application Information

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IPC IPC(8): H01M10/54
CPCH01M10/54Y02W30/84
Inventor 王雪
Owner SINO SCI PROCESS BEIJING SCI&TECH CO LTD
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