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A method for resource utilization of waste lithium-ion battery roasting tail gas

A lithium-ion battery, resource-based technology, applied in battery recycling, recycling technology, alkali metal fluoride, etc., can solve secondary pollution resources, waste, not mentioned activated carbon and alkaline hydroxide or oxide recovery Treatment process and other problems, to achieve the effect of low energy consumption, low reagent cost, and resource utilization

Active Publication Date: 2020-08-07
GUANGDONG GUANGHUA SCI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Similarly, this method does not mention the recovery process of activated carbon and alkaline hydroxide or oxide after the reaction, which is easy to cause secondary pollution and waste of resources

Method used

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  • A method for resource utilization of waste lithium-ion battery roasting tail gas

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The waste lithium iron phosphate battery was placed in a rotary kiln for indirect reduction roasting, the roasting temperature was controlled at 500°C, and the roasting time was 2h. Use 1mol / L sodium hydroxide solution to spray and absorb the roasting tail gas to F - The concentration is 8.0g / L, and the filter residue containing lithium phosphate and lithium fluoride and the filtrate containing sodium fluoride are obtained by filtration. The filtrate was evaporated and crystallized at 120°C, and when the volume was evaporated to 31% of the volume of the original filtrate, it was filtered immediately, and the obtained filtrate was a crystal of sodium fluoride. Dissolve the filter residue with 6mol / L hydrochloric acid, add calcium oxide 1.2 times the total molar weight of F and P, and at the same time add 3mol / L sodium hydroxide to adjust the pH to 8.5, and filter to obtain calcium fluoride, calcium oxide and calcium phosphate The mixed filter residue and lithium-contain...

Embodiment 2

[0023] The waste nickel-cobalt-manganese ternary battery was placed in a rotary kiln for indirect reduction roasting, the roasting temperature was controlled at 550°C, and the roasting time was 2h. Use 2mol / L sodium hydroxide solution to spray and absorb the roasting tail gas to F - The concentration is 8.5g / L, and the filter residue containing lithium phosphate and lithium fluoride and the filtrate containing sodium fluoride are obtained by filtration. The filtrate was evaporated and crystallized at 125°C, and when the volume was evaporated to 28% of the volume of the original filtrate, it was filtered immediately, and the filtrate obtained was a crystal of sodium fluoride. Dissolve the filter residue with 5 mol / L hydrochloric acid, add calcium oxide 1.3 times the total molar weight of F and P, and at the same time add 3 mol / L sodium hydroxide to adjust the pH to 9.5, and filter to obtain calcium fluoride, calcium oxide and calcium phosphate The mixed filter residue and lith...

Embodiment 3

[0025] The waste lithium iron phosphate battery was placed in a rotary kiln for indirect reduction roasting, the roasting temperature was controlled at 500°C, and the roasting time was 2h. Use 1mol / L sodium hydroxide solution to spray and absorb the roasting tail gas to F - The concentration is 10.0g / L, and the filter residue containing lithium phosphate and lithium fluoride and the filtrate containing sodium fluoride are obtained by filtration. The filtrate was evaporated and crystallized at 110°C, and filtered immediately when the volume was evaporated to 36% of the volume of the original filtrate, and the obtained filtrate was a crystal of sodium fluoride. Dissolve the filter residue with 6mol / L hydrochloric acid, add calcium oxide 1.3 times the total molar weight of F and P, and at the same time add 3mol / L sodium hydroxide to adjust the pH to 9.0, and filter to obtain calcium fluoride, calcium oxide and calcium phosphate The mixed filter residue and lithium-containing fil...

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Abstract

The invention discloses a method for the resource utilization of waste lithium ion battery roasting tail gas. Indirect reduction roasting is performed on waste lithium ion batteries in a rotary kiln,and battery powder and metal current collectors which are used for the recycling of follow-up processes after roasting, crushing and sieving; after tail gas generated during roasting is absorbed through the spraying of an alkaline solution, mixed filter residues of lithium phosphate and lithium fluoride and sodium fluoride containing filtrate can be obtained through filtering; a sodium fluoride product and crystallization mother liquor can be obtained after the evaporation, crystallization and filtration of the filtrate, and the crystallization mother liquor can return to be absorbed through spraying; calcium oxide or calcium hydroxide is added to precipitate fluorine and phosphor after the acid dissolution of the filter residues, mixed filter residues of calcium fluoride, calcium oxide and calcium phosphate which can be used as ceramic raw materials and lithium containing filtrate can be obtained after filtering; and a lithium carbonate product and alkaline filtrate are obtained afterthe concentration, lithium precipitation and filtering of the filtrate, and the alkaline filtrate can return back to the alkaline solution to adjust the pH of the solution. The method is simple in technology, short in process and low in reagent cost, and secondary pollution cannot be generated, so that the recycling problems of fluorine, phosphor and lithium in waste lithium ion battery roastingtail gas can be effectively solved.

Description

technical field [0001] The invention relates to the field of waste power battery recycling, in particular to a method for resource utilization of waste lithium ion battery roasting tail gas. Background technique [0002] Since the commercialization of lithium-ion batteries in the 1990s, due to their advantages such as high voltage, high energy density, long cycle life, good safety and no memory effect, they have gradually replaced other types of secondary batteries and are widely used in Mobile communications, notebook computers, portable tools, electric bicycles and other fields. Due to the large consumption of lithium-ion batteries, it will cause serious pollution to the environment. At the same time, waste lithium-ion batteries, especially batteries, contain a lot of resources such as cobalt, lithium, copper, aluminum, nickel, iron, manganese, graphite, etc., which will also cause serious pollution. Waste of resources. Therefore, it is necessary to recycle waste lithium...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/54C01D15/08C01D3/02C04B35/626
CPCC01D3/02C01D15/08C04B35/62204C04B35/626H01M10/54Y02W30/84
Inventor 王成彦杨成荆乾坤张家靓马保中曹志河陈永强邢鹏张文娟
Owner GUANGDONG GUANGHUA SCI TECH
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