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A kind of full-component resource recovery method of lithium iron phosphate-carbon waste

A technology of lithium iron phosphate and a recovery method, which is applied in the field of solid waste material resource recovery and circular economy, can solve the problems of low recovery rate, long microbial culture period, safety, etc., and achieves strong operability, simple and reliable reaction process. control, high application value and the effect of market promotion prospects

Active Publication Date: 2022-08-09
HUNAN INSTITUTE OF ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electrolysis method separates and recycles lithium or iron elements by electrolyzing waste lithium iron phosphate materials. The process does not involve the use of acid-base solutions. The process is relatively short, but there are potential safety hazards, and the efficiency of batch processing is low.
The biodegradation method uses the metabolites of microorganisms to dissolve and leach lithium iron phosphate waste, and comprehensively recovers various elements. It is green and pollution-free, but the recovery rate is not high and the microbial cultivation period is long.

Method used

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  • A kind of full-component resource recovery method of lithium iron phosphate-carbon waste
  • A kind of full-component resource recovery method of lithium iron phosphate-carbon waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Weigh 20 g of lithium iron phosphate / carbon waste, and its component contents are: carbon 1.4112 g, lithium 0.8226 g, iron 6.5889 g, and phosphorus 3.6498 g. Prepare 300 mL of 0.5 mol / L sulfuric acid solution, add 40 g of ammonium persulfate, and after complete dissolution, add lithium iron phosphate / carbon waste. The reaction was mechanically stirred at 80°C and 300rpm for 4h, and filtered to obtain filtrate 1 (mixed solution of lithium sulfate and ammonium sulfate) and filter cake 1 (iron phosphate / carbon precipitation);

[0037] 6.0g of ammonium carbonate was added to the filtrate 1, and the reaction was mechanically stirred at 80°C and 400rpm for 5h, and filtered to obtain filtrate 2 (mixed solution of lithium carbonate and ammonium sulfate) and filter cake 2 (lithium carbonate precipitation);

[0038] 1.5g phosphoric acid solution (85wt.%) was added to the filtrate 2, and the reaction was mechanically stirred at 50°C and 400rpm for 2h, and filtered to obtain filtra...

Embodiment 2

[0044] Weigh 20 g of lithium iron phosphate / carbon waste, and its component contents are: carbon 1.4112 g, lithium 0.8226 g, iron 6.5889 g, and phosphorus 3.6498 g. Prepare 250 mL of 0.7 mol / L sulfuric acid solution, add 50 g of ammonium persulfate, and after complete dissolution, add lithium iron phosphate / carbon waste. The reaction was mechanically stirred at 70° C. and 400 rpm for 6 h, and filtered to obtain filtrate 1 (mixed solution of lithium sulfate and ammonium sulfate) and filter cake 1 (iron phosphate / carbon precipitation).

[0045] 8.0g of ammonium carbonate was added to the filtrate 1, and the reaction was mechanically stirred at 90°C and 300rpm for 4h, and filtered to obtain filtrate 2 (mixed solution of lithium carbonate and ammonium sulfate) and filter cake 2 (lithium carbonate precipitation);

[0046] 2g phosphoric acid solution (85wt.%) was added to the filtrate 2, and the reaction was mechanically stirred at 40°C and 400rpm for 3h, and filtered to obtain filt...

Embodiment 3

[0052] Weigh 20 g of lithium iron phosphate / carbon waste, and its component contents are: carbon 1.4112 g, lithium 0.8226 g, iron 6.5889 g, and phosphorus 3.6498 g. Prepare 200 mL of 1 mol / L sulfuric acid solution, add 60 g of ammonium persulfate, and after complete dissolution, add lithium iron phosphate / carbon waste. The reaction was mechanically stirred at 90°C and 250rpm for 3h, and filtered to obtain filtrate 1 (mixed solution of lithium sulfate and ammonium sulfate) and filter cake 1 (iron phosphate / carbon precipitation);

[0053] 10g of ammonium carbonate was added to the filtrate 1, and the reaction was mechanically stirred at 95°C and 300rpm for 3h, and filtered to obtain filtrate 2 (lithium carbonate, ammonium sulfate mixed solution) and filter cake 2 (lithium carbonate precipitation);

[0054] 2g phosphoric acid solution (85wt.%) was added to filtrate 2, and the reaction was mechanically stirred at 50°C and 400rpm for 3h, and filtered to obtain filtrate 3 (ammonium ...

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Abstract

The invention discloses a full-component resource recovery method of lithium iron phosphate-carbon waste, belonging to the technical field of solid waste material resource recovery and circular economy. The invention mainly analyzes the whole components of the discarded battery material lithium iron phosphate-carbon waste, detects the content of each element in the waste, and then performs acid leaching-oxidation, filtration, Selective precipitation, evaporative crystallization and other steps, the lithium iron phosphate-carbon waste and added reaction reagents are co-resourced into lithium carbonate, lithium phosphate, carbon, iron hydroxide, compound fertilizers and other products. The invention realizes the resource utilization of all the components in the lithium iron phosphate-carbon waste, all the components in the lithium iron phosphate-carbon waste and all the added reagents finally realize reasonable and value-added resource utilization, and does not The generation of new waste products, waste water and waste gas increases the environmental burden, which is in line with the development concept of green circular economy.

Description

technical field [0001] The invention relates to the technical field of solid waste material resource recovery and circular economy, in particular to a full-component resource recovery method of lithium iron phosphate-carbon waste. Background technique [0002] Lithium iron phosphate batteries have good safety, long life and low price. In recent years, they have been widely used in the field of power and energy storage. According to real lithium research data, the shipment of lithium iron phosphate materials in 2015 was 32,000 tons, which will increase to 124,000 tons in 2020; correspondingly, the installed capacity of lithium iron phosphate batteries in 2015 was 10.57GWh, which will increase in 2020. to 23.2GWh. With the rapid expansion of the production scale of lithium iron phosphate batteries, a large amount of lithium iron phosphate-carbon waste will be generated during the production process of lithium iron phosphate batteries; since the life of lithium iron phosphate ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/54
CPCH01M10/54Y02W30/84
Inventor 刘万民
Owner HUNAN INSTITUTE OF ENGINEERING
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