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

Method for extracting lithium and iron phosphate from lithium iron phosphate waste

A technology of lithium iron phosphate and iron phosphate, which is applied in the field of waste recycling, can solve the problems of general iron phosphate product indicators, many process flows, and poor removal effect of positive electrode aluminum, and achieve low cost, short process flow, and good The effect of economic benefits

Inactive Publication Date: 2019-01-11
CHENGDU LV LI ENVIRONMENTAL PROTECTION TECH CO LTD
View PDF12 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this invention is that it can make full use of the P, Fe, and Li resources in the lithium iron phosphate waste, and the resource recovery rate is high; the disadvantage is that there are many technological processes, it is necessary to add phosphoric acid ball mills, and it is easy to introduce impurities such as magnetic substances. Very good removal effect, the main target product is lithium carbonate, and the obtained iron phosphate product index is average

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 extracting lithium and iron phosphate from lithium iron phosphate waste
  • Method for extracting lithium and iron phosphate from lithium iron phosphate waste
  • Method for extracting lithium and iron phosphate from lithium iron phosphate waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] (1) Weigh 200g of lithium iron phosphate powder. The data is as follows:

[0054] Table 1 Lithium iron phosphate powder data, %

[0055]

[0056] Add 500mL of 1moL / L NaOH solution and soak for 30min. After the violent reaction is over, separate the solid and liquid and wash. The obtained alkaline aluminum liquid is treated separately, and the obtained solid is aluminum-removing material.

[0057] (2) Carry out the aerobic roasting reaction at 480° C. for the aluminum removal material obtained in step (1). The time for the aerobic roasting reaction is 0.5 h, and the oxygen volume fraction is controlled to 20%. After the reaction is completed, the data of the roasted material obtained are as follows:

[0058] Table 2 roasted material data, %

[0059] Li

[0060] *Note: ND means not detected, the same below.

[0061] (3) Cool the roasted material obtained in step (2) to below 100°C, add 200mL of water, slowly add 36mL of concentrated sulfuric acid, stir fo...

Embodiment 2

[0074] (1) Weigh 500g of lithium iron phosphate powder. Data are as follows:

[0075] Table 6 Lithium iron phosphate powder data, %

[0076]

[0077] Add 1000mL of 1.5moL / L NaOH solution, soak for 120min, and after the violent reaction is over, separate the solid and liquid and wash. The obtained alkaline aluminum liquid is treated separately, and the obtained solid is aluminum-removing material.

[0078] (2) Carry out aerobic roasting reaction at 800° C. for the aluminum-removing material obtained in step (1). The time for the aerobic roasting reaction is (1 h), and the oxygen volume fraction is controlled to 50%. After the reaction is completed, the roasted material data obtained are as follows:

[0079] Table 7 roasted material data, %

[0080] Li

[0081] (3) Cool the calcined material obtained in step (2) to below 100°C, add 650mL of water, add 350mL of hydrochloric acid (30%), stir and react for 60min, control the pH end point to 1.8, and obtain the pickl...

Embodiment 3

[0094] (1) Weigh 1000g of lithium iron phosphate powder. The data is as follows:

[0095] Table 11 Lithium iron phosphate powder data, %

[0096]

[0097] Add 2000mL of 2moL / L NaOH solution and soak for 180min. After the violent reaction is over, separate the solid and liquid and wash. The obtained alkaline aluminum liquid is treated separately, and the obtained solid is aluminum-removing material.

[0098] (2) The aluminum-removing material obtained in step (1) is subjected to an aerobic roasting reaction at 1050°C. The time for the aerobic roasting reaction is 90 minutes, and the oxygen volume fraction is controlled to 60%. After the reaction is completed, the data of the roasted material obtained are as follows:

[0099] Table 12 roasted material data, %

[0100] Li

[0101] (3) Cool the calcined material obtained in step (2) to below 100°C, add 2100mL of nitric acid (3mol / L), stir and react for 120min, and control the pH end point to 3.0 to obtain an acid d...

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 extracting lithium and iron phosphate from lithium iron phosphate waste, comprising the following steps: (1) immersing lithium iron phosphate powder with NaOH to obtain an aluminum removal material; (2) performing an aerobic calcination reaction on the aluminum removal material to obtain a calcined material; (3) cooling the calcined material, and adding acid tocarry out a leaching reaction to obtain pickle liquor and iron phosphate; (4) performing solid-liquid separation on the pickle liquor to obtain an iron phosphate solid and an acidic lithium liquid; (5) washing the iron phosphate and drying to obtain battery-grade iron phosphate; and (6) regulating pH value of the acidic lithium liquid to alkaline level and filtering to obtain a purified lithium liquid. The method of the invention has simple process and no requirement for raw materials; the consumption of acid and alkali in the extraction process is low, and the by-products are few; the qualityof the obtained product iron phosphate is stable, and index requirements of the battery-grade product are met; and the elements such as lithium, iron and phosphorus are effectively recovered and theyield is high, and the method is easy to achieve industrial production.

Description

technical field [0001] The invention belongs to the technical field of recycling waste materials, and in particular relates to a method for extracting lithium and iron phosphate from lithium iron phosphate waste materials. Background technique [0002] Lithium-ion batteries are the most widely used lithium batteries at present. Lithium-ion batteries can be divided into: lithium iron phosphate (LFP), lithium nickelate (LNO), lithium manganese oxide (LMO), lithium cobaltate (LCO) according to the positive electrode material , and ternary lithium nickel cobalt manganate (NCM), ternary lithium nickel cobalt aluminate (NCA), etc. Compared with traditional lead-acid batteries or other new secondary batteries, lithium-ion batteries have huge advantages. The main advantages are: ①The voltage platform of lithium-ion batteries is high; the working voltage of lithium iron phosphate single batteries is 3.2V, and lithium cobalt oxide and The average working voltage of a lithium single b...

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
IPC IPC(8): C01B25/37C01D15/08C01D15/02C01D15/06C01D15/04
CPCC01B25/375C01D15/02C01D15/04C01D15/06C01D15/08C01P2006/80
Inventor 周应涛
Owner CHENGDU LV LI ENVIRONMENTAL PROTECTION TECH CO LTD
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