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A method for preparing battery-grade lithium carbonate with waste lithium iron phosphate pole pieces

A technology of lithium iron phosphate and lithium carbonate, applied in lithium carbonate;/acid carbonate, battery electrodes, secondary batteries, etc. Waste of elements and other issues, to achieve the effect of simple method, high recovery rate and strong pertinence

Active Publication Date: 2020-09-01
湖南金凯循环科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the method of recycling lithium iron phosphate pole pieces can separate and recover different elements in lithium iron phosphate pole pieces, but the leaching rate of lithium element is not high enough, resulting in a lot of waste of lithium elements, and the prepared lithium carbonate is not pure enough , containing more impurities of aluminum hydroxide and iron hydroxide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method for preparing battery-grade lithium carbonate with waste lithium iron phosphate pole pieces, comprising the steps of:

[0021] Step 1. Weigh 20g of waste lithium iron phosphate pole pieces and release the remaining power;

[0022] Step 2. Put the waste lithium iron phosphate pole pieces that have released the electricity in step 1 into a roasting furnace, heat to 800°C, and oxidize and roast for 1 hour, so that the binder and conductive carbon black are burned to obtain lithium iron phosphate. Pole piece firing material of active material and current collector aluminum foil;

[0023] Step 3, put the pole piece roasted material obtained in step 2 into a pulverizer for pulverization to obtain a mixed powder of lithium iron phosphate pole piece powder and aluminum powder, and then use a 100-mesh sieve to sieve the mixed powder, and ferric phosphate The lithium pole piece powder is separated from the aluminum powder, and the oversize is aluminum powder, and the un...

Embodiment 2

[0028] Compared with Example 1, the only difference is that the molar ratio Li / H=1.05 of the lithium element in the lithium iron phosphate pole piece powder to the hydrogen element in the hydrochloric acid in step 4, the mass solid-liquid ratio of the lithium iron phosphate pole piece powder and hydrochloric acid is 1:2, other conditions are the same as in Example 1.

Embodiment 3

[0030] Compared with Example 1, the only difference is that the molar ratio Li / H=1.1 of the lithium element in the lithium iron phosphate pole piece powder to the hydrogen element in the hydrochloric acid in step 4, the mass solid-liquid ratio of the lithium iron phosphate pole piece powder and hydrochloric acid is 1:3, other conditions are the same as in Example 1.

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PUM

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Abstract

A method for preparing battery grade lithium carbonate from waste lithium iron phosphate electrode sheets relates to that technical field of lithium batteries. The method comprises the steps of: 1, releasing electricity; 2, performing oxidizing and roasting to obtain electrode sheet roast material containing lithium iron phosphate active material and current collector aluminum foil; 3, pulverizingthe roasted material and performing screening to obtain separated aluminum powder and lithium iron phosphate electrode sheet powder; 4, detecting the content of the lithium element in the lithium iron phosphate electrode sheet powder, preparing an acid solution according to a certain molar ratio according to the content of the lithium element, adding the lithium iron phosphate electrode sheet powder into the acid solution according to a certain mass-solid-liquid ratio for reaction, and finally filtering to obtain a first mixed liquid; 5, adding sodium hydroxide into the first mixed solution for reaction, and filtering to obtain a second mixed solution; 6, reacting the second mixed solution with the sodium carbonate solution and filtering to obtain battery-grade lithium carbonate. The invention can effectively improve the leaching rate of the lithium element and the purity of lithium carbonate.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a method for preparing battery-grade lithium carbonate from waste lithium iron phosphate pole pieces. Background technique [0002] Lithium iron phosphate batteries are widely used in our lives and have high demand. When making this lithium battery, battery-grade lithium carbonate materials are required. The lithium carbonate can be synthesized from natural lithium elements and other compounds, but due to the shortage of lithium elements, And from the perspective of energy utilization, many producers will choose to recover lithium elements from waste lithium iron phosphate pole pieces, and then produce battery-grade lithium carbonate. [0003] At present, the method of recycling lithium iron phosphate pole pieces can separate and recover different elements in lithium iron phosphate pole pieces, but the leaching rate of lithium element is not high enough, resulting in a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/54H01M4/58H01M10/0525C01D15/08
CPCC01D15/08C01P2006/80H01M4/5825H01M10/0525H01M10/54Y02E60/10Y02W30/84
Inventor 颜群轩颜群湘肖绍辉
Owner 湖南金凯循环科技股份有限公司
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