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A method for selectively extracting lithium from lithium iron phosphate waste

A lithium iron phosphate, selective technology, applied in chemical instruments and methods, alkali metal carbonates, recycling by waste collectors, etc., can solve the problems of poor filtering effect, low leaching rate, poor filtering effect of filter residue, etc. The effect of high value, simple process and considerable economic benefits

Active Publication Date: 2020-12-11
GUANGDONG BRUNP RECYCLING TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this invention, the oxidant is added first to make pulp, and then the acid is added to adjust the value. The resulting filter residue has poor filtration effect and low lithium leaching rate.
During the reaction process, the oxidizing agent is added in advance, and with the addition of acid, the iron leaches and rapidly oxidizes and precipitates, forming many fine crystal nuclei to obtain nano-scale iron phosphate, and the filtering effect is poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for selectively extracting lithium from lithium iron phosphate waste, comprising the following steps:

[0030] Slurry and stir 100 g (0.57 mol) of lithium iron phosphate waste (lithium content 3.94% wt) and 250 ml of water; add 30 g of concentrated sulfuric acid to the above slurry, and simultaneously heat up to 75 ° C; add sodium carbonate and chloric acid to the slurry A mixed solution of sodium 1:10, adjust the pH value to 3.2; the adjusted slurry continues to react for a certain period of time, adding sodium carbonate and sodium chlorate mixed solution in the process to maintain pH stability; filter the fully reacted slurry to obtain Lithium solution 280ml (lithium concentration: 13.96g / L) and ferrophosphorus slag.

[0031] Add sodium carbonate to the obtained lithium solution to adjust the pH value to 10.3, remove impurities therein, and obtain a pure lithium solution; add 30% sodium carbonate solution to the pure lithium solution, react for 2 hours, filte...

Embodiment 2

[0033] A method for selectively extracting lithium from lithium iron phosphate waste, comprising the following steps:

[0034] Slurry and stir 100 g (0.57 mol) of lithium iron phosphate waste (lithium content 3.94% wt) and 200 ml of water; add 65 g of concentrated hydrochloric acid to the above slurry, and simultaneously heat up to 55 ° C; add sodium chlorate and hydrogen peroxide to the slurry For a mixed solution with a solid-to-liquid ratio of 1:5, adjust the pH value to 2.5; continue to react the adjusted slurry for a certain period of time for 4 hours, add hydrogen peroxide and sodium chlorate mixed solution during the process to maintain pH stability; filter the fully reacted slurry, 310ml of lithium solution (lithium concentration: 12.49g / L) and ferrophosphorus slag were obtained.

[0035] Add lithium carbonate to the obtained lithium solution to adjust the pH value to 9.8, remove impurities therein, and obtain a pure lithium solution; add 30% sodium carbonate solution ...

Embodiment 3

[0037] A method for selectively extracting lithium from lithium iron phosphate waste, comprising the following steps:

[0038] Slurry and stir 100 g (0.57 mol) of lithium iron phosphate waste (lithium content 3.94% wt) and 350 ml of water; add 30 g of concentrated sulfuric acid to the above slurry, and simultaneously heat up to 85 ° C; add sodium hypochlorite solution to the slurry to adjust the pH value to 3.8; the adjusted slurry continued to react for a certain period of time for 4 hours, and sodium hypochlorite solution was added during the process to maintain pH stability; the fully reacted slurry was filtered to obtain 400ml of lithium solution (lithium concentration: 9.81g / L) and ferrophosphorus slag .

[0039] Add sodium carbonate and lithium carbonate mixture to the obtained lithium solution to adjust the pH value to 10.1, remove impurities therein to obtain a pure lithium solution; add 30% sodium carbonate solution to the pure lithium solution, react for 2 hours, fil...

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Abstract

The invention discloses a method for selectively extracting lithium from lithium iron phosphate waste materials. The method comprises the following steps that water is added into the lithium iron phosphate waste material for slurry, then acid is added, and the temperature is heated to 40-100 DEG C, the pH value of the system is adjusted to 2-4, the temperature and the pH value range are kept, reacting is carried out for 1-10 hours, and filtering and separating are carried out on the reacted slurry so as to obtain a lithium solution and phosphorus iron slag; and the acid is one of concentratedhydrochloric acid, concentrated sulfuric acid or concentrated nitric acid. According to the method, the lithium in the waste lithium iron phosphate material is recycled, the lithium recovery rate is up to 98% or above, and the purity of the further prepared lithium carbonate reaches 99.0% or above; the method is simple in process, and low in energy consumption; and the selective extraction of thelithium in the waste lithium iron phosphate material is realized, the product value is high, considerable economic benefits are achieved, and the recovery and development of lithium iron phosphate waste batteries are facilitated.

Description

technical field [0001] The invention belongs to the field of recycling high-value waste resources, and in particular relates to a method for selectively extracting lithium from lithium iron phosphate waste. Background technique [0002] Lithium iron phosphate is currently the most widely used lithium-ion battery material, and is regarded by many industry insiders as the future development direction of lithium batteries. Since the 21st century, with the blowout development of the lithium battery new energy market, the problem of disposal of waste lithium iron phosphate batteries has become increasingly prominent, and its recycling has become the research focus of all walks of life. [0003] Chinese patent application CN106910959A proposes a method for selectively recovering lithium from lithium iron phosphate waste. This system uses lithium iron phosphate waste plus oxidant to make pulp, and at the same time adds acid to adjust the pH value, and controls the pH value to 2-11 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B26/12H01M10/54C01D7/00
CPCC01D7/00C22B7/007C22B26/12H01M10/54Y02W30/84Y02P10/20
Inventor 唐红辉乔延超戴曦陈若葵李长东
Owner GUANGDONG BRUNP RECYCLING TECH CO LTD
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