Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for selectively recovering lithium in waste lithium iron phosphate anode material by high temperature solid phase method

A technology of lithium iron phosphate and cathode material is applied in the field of selective recovery of lithium in waste lithium iron phosphate cathode material by high-temperature solid-phase method, which can solve the problems of waste of phosphorus resources, complicated process and high processing cost, and achieves clean and simple process. , the effect of high leaching rate

Inactive Publication Date: 2018-08-28
INST OF PROCESS ENG CHINESE ACAD OF SCI
View PDF8 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method first uses alkali and then acid to decompose the lithium iron phosphate positive electrode material, the process is complicated, and the processing cost is high; at the same time, iron is precipitated in the form of iron phosphate and mixed with impurities such as carbon black to be discharged as waste residue, and it has not been commercialized. , resulting in waste of iron and phosphorus resources

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for selectively recovering lithium in waste lithium iron phosphate anode material by high temperature solid phase method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] This embodiment provides a method for recovering lithium in waste lithium iron phosphate positive electrode material by solid phase method, the specific method is:

[0043] (1) After mixing the waste lithium iron phosphate cathode material with sodium sulfate (auxiliary agent), oxidize and calcinate it at 600°C under the condition of introducing a large amount of ozone (oxidant), so that the binder in the waste lithium iron phosphate cathode material Decomposition and volatilization, the added mass of sodium sulfate is 1.5 times the theoretical mass required to form lithium sulfate, and the calcination time is 360min to obtain clinker. The ferrous ion in lithium iron phosphate is oxidized to trivalent at high temperature, and the sulfuric acid in lithium and additive The water-soluble lithium salt formed by the combination of roots;

[0044] (2) After the calcined clinker is cooled, it is leached in water at 25°C for 240 minutes, and the lithium salt is leached into the...

Embodiment 2

[0049] This embodiment provides a method for recovering lithium in waste lithium iron phosphate positive electrode material by solid phase method, the specific method is:

[0050] (1) After mixing the waste lithium iron phosphate positive electrode material with potassium hydrogen sulfate, oxidize and calcinate it at 800°C under the condition of feeding a large amount of oxygen, so that the binder in the waste lithium iron phosphate positive electrode material is decomposed and volatilized, and potassium hydrogen sulfate The added mass is 1.5 times of the theoretical mass required to form lithium sulfate, and the calcination time is 240min to obtain clinker, a water-soluble lithium salt formed by the combination of lithium and hydrogen sulfate in the auxiliary agent;

[0051] (2) After the calcined clinker is cooled, it is leached in water at 60°C for 120 minutes, and the lithium salt is leached into the liquid phase, while iron and phosphorus exist in the solid phase in the fo...

Embodiment 3

[0055] This embodiment provides a method for recovering lithium in waste lithium iron phosphate positive electrode material by solid phase method, the specific method is:

[0056] (1) After mixing the waste lithium iron phosphate cathode material with ammonium sulfate, oxidize and calcinate it at 1200°C under the condition of introducing a large amount of air to decompose and volatilize the binder in the waste lithium iron phosphate cathode material, and add a mass of ammonium sulfate To form 1.5 times the theoretical mass required for lithium sulfate, the calcination time is 120min to obtain clinker, a water-soluble lithium salt formed by the combination of lithium and sulfate in the auxiliary agent;

[0057] (2) After the calcined clinker is cooled, it is leached in water at 110° C. for 30 minutes, and the lithium salt is leached into the liquid phase, while iron and phosphorus exist in the solid phase in the form of ferric phosphate precipitation to obtain a slurry;

[0058...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a method for selectively recovering lithium in a waste lithium iron phosphate anode material by high temperature solid phase method. The method comprises the following steps: (1), mixing the waste lithium iron phosphate anode material and auxiliary agent, and calcining to obtain clinker containing water-soluble lithium salt; (2), after the clinker in the step (1) is cooled,leaching with an aqueous solution to obtain a slurry; (3), filtering the slurry in the step (2), and washing the filter residues to obtain lithium-rich solution and iron phosphate slag. The method selectively extracts the lithium in the waste lithium iron phosphate anode material rather than synchronously extracting the phosphorus and the iron. The flow is simple. The process is clean. No waste water or waste gas are discharged and the recovery rate of the lithium can reach over 95 percent.

Description

technical field [0001] The invention belongs to the technical field of resource recovery, and relates to a method for recovering lithium in positive electrode materials, in particular to a method for selectively recovering lithium in waste lithium iron phosphate positive electrode materials by a high-temperature solid-phase method. Background technique [0002] Lithium iron phosphate cathode material (LFP for short) has attracted much attention due to its advantages of abundant raw material sources, low price, non-toxicity, high theoretical capacity, good thermal stability and good cycle performance, and is the development direction of power batteries. With the increase in the use of lithium iron phosphate power batteries, the disposal of waste lithium iron phosphate batteries will become a key link in the field of new energy. If the waste battery cathode material is not safely disposed of, it will cause great harm to the environment and public safety. The current conventio...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C22B26/12C22B7/00H01M10/54
CPCC01B25/375C01D15/00C01D15/08C01P2006/80C22B26/12H01M10/54Y02P10/20Y02W30/84
Inventor 郑诗礼张洋王晓健范兵强李平张盈乔珊周宏明
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com