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
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  • 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 n

Method used

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  • 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

Example Embodiment

[0052] Example 1

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

[0054] Table 1 Data of lithium iron phosphate powder,%

[0055]

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

[0057] (2) The dealuminized material obtained in step (1) is subjected to aerobic calcination reaction at 480°C, the aerobic calcination reaction time is 0.5h, the oxygen volume fraction is controlled to 20%, and the calcined material data obtained after the reaction is completed is as follows:

[0058] Table 2 Baking material data,%

[0059] Li

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

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

Example Embodiment

[0073] Example 2

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

[0075] Table 6 Data of lithium iron phosphate powder,%

[0076]

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

[0078] (2) The dealuminized material obtained in step (1) is subjected to aerobic roasting reaction at 800°C, the aerobic roasting reaction time is (1h), the oxygen volume fraction is controlled to 50%, and the calcined material data obtained after the reaction is completed is as follows:

[0079] Table 7 Baking material data,%

[0080] Li

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

Example Embodiment

[0093] Example 3

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

[0095] Table 11 Data of lithium iron phosphate powder,%

[0096]

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

[0098] (2) The aluminized material obtained in step (1) is subjected to aerobic calcination reaction at 1050°C, the aerobic calcination reaction time is 90 minutes, and the oxygen volume fraction is controlled to 60%. After the reaction is completed, the calcined material data obtained is as follows:

[0099] Table 12 Baking material data,%

[0100] Li

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

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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

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Application Information

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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
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