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Method for preparing acid-resistant superabsorbent slow-release fertilizer from waste lithium iron phosphate batteries

A lithium iron phosphate battery and super water-absorbing technology, which is applied in secondary batteries, acid electrolytes, nitrogen fertilizers, etc., can solve the problems of poor water absorption, high cost, and inability to alleviate crop growth hazards, and achieve high water absorption rate, high water absorption capacity, The effect of excellent high water absorption and low fertilizer slow release properties

Active Publication Date: 2022-06-21
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the slow-release compound fertilizer has a wide variety of raw materials, is expensive, and has poor water absorption, which cannot alleviate the harm of drought to crop growth.

Method used

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  • Method for preparing acid-resistant superabsorbent slow-release fertilizer from waste lithium iron phosphate batteries
  • Method for preparing acid-resistant superabsorbent slow-release fertilizer from waste lithium iron phosphate batteries
  • Method for preparing acid-resistant superabsorbent slow-release fertilizer from waste lithium iron phosphate batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The waste lithium iron phosphate powder is added to the sodium persulfate solution, the molar ratio of the lithium iron phosphate powder and the sodium persulfate solution is 2:1.4, and the filtered solid part is added to the sodium sulfide aqueous solution, and the concentration of the sodium sulfide aqueous solution is 0.10 mol / L, add phosphoric acid to adjust the pH of the mixed solution to 6, and filter to obtain a hydrogen phosphate mixed solution with a concentration of 0.8 mol / L (calculated as dihydrogen phosphate). Urea, acrylic acid, ammonium persulfate and N,N-methylenebisacrylamide are added to the above-mentioned hydrogen phosphate mixed solution, the mass ratio of acrylic acid and hydrogen phosphate mixture is 6:1, and the mass ratio of urea and hydrogen phosphate mixture is 6:1, the mass percentage of the mixture of N,N-methylenebisacrylamide and hydrogen phosphate is 6%. 80 degrees, react in nitrogen atmosphere for 1 hour to obtain acid-resistant super-ab...

Embodiment 2

[0039] The waste lithium iron phosphate powder is added to the sodium persulfate solution, the molar ratio of the lithium iron phosphate powder and the sodium persulfate solution is 2:1.4, and the filtered solid part is added to the sodium sulfide aqueous solution, and the concentration of the sodium sulfide aqueous solution is 0.10 mol / L, adding phosphoric acid to adjust the pH of the mixed solution to 5, and filtering to obtain a hydrogen phosphate mixed solution with a concentration of 0.6 mol / L (calculated as dihydrogen phosphate). Urea, acrylic acid, benzoyl peroxide and N,N-methylenebisacrylamide are added to the above-mentioned hydrogen phosphate mixed solution, the mass ratio of acrylic acid and hydrogen phosphate mixture is 14:1, and the mass ratio of urea and hydrogen phosphate mixture is The ratio is 14:1, the mass percentage of the mixture of benzoyl peroxide and hydrogen phosphate is 35%, and the percentage of the mixture of N,N-methylenebisacrylamide and hydrogen ...

Embodiment 3

[0041] The waste lithium iron phosphate powder is added to the sodium persulfate solution, the molar ratio of the lithium iron phosphate powder and the sodium persulfate solution is 2:1.4, and the filtered solid part is added to the sodium sulfide aqueous solution, and the concentration of the sodium sulfide aqueous solution is 0.10 mol / L, add phosphoric acid to adjust the pH of the mixed solution to be 6, filter to obtain a hydrogen phosphate mixed solution, the concentration is 1.0 mol / L (calculated by dihydrogen phosphate), urea, acrylic acid, benzoyl peroxide and N,N -Methylenebisacrylamide is added to the above-mentioned hydrogen phosphate mixed solution, the mass ratio of acrylic acid and hydrogen phosphate mixture is 10:1, the mass ratio of urea and hydrogen phosphate mixture is 10:1, benzoyl peroxide and hydrogen phosphate The mass percentage of the salt mixture is 25%, and the mass percentage of the mixture of N,N-methylenebisacrylamide and hydrogen phosphate is 8%. 8...

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Abstract

The invention relates to a method for preparing acid-resistant superabsorbent slow-release fertilizer from waste lithium iron phosphate batteries, which belongs to the new technology of resource utilization of solid waste for environmental protection and comprehensive utilization of resources. Using waste lithium iron phosphate batteries, a hydrogen phosphate mixed solution with a specific ratio is obtained. This process reduces the activation energy of the condensation reaction of the system and promotes the formation of porous protrusions and a smooth and compact three-dimensional structure of the product. At the same time, the hydrogen phosphate mixture passes through and carboxyl The hydrogen bond is grafted onto the molecular chain, and its pH buffering effect can help the product maintain high water absorption capacity and low fertilizer release rate under acidic conditions. The acid-resistant superabsorbent polymer prepared by the invention has excellent acid resistance and stability, and still has high water absorption rate and low nitrogen, phosphorus and potassium fertilizer release rate under acidic conditions. Compared with the existing patents, the invention has simple process, simple types of raw materials, low cost, excellent acid resistance of the product, and can meet the needs of plants for water and fertilizer at the same time.

Description

technical field [0001] The invention relates to a new method for recycling high value-added resources of waste and old lithium iron phosphate batteries, in particular to a slow-release fertilizer with excellent acid resistance, high water absorption and low fertilizer slow-release rate prepared by using waste and old lithium iron phosphate batteries, especially It is suitable for high value-added regeneration and recycling of various phosphorus-containing wastes, and belongs to a new technology of solid waste resource utilization for environmental protection and comprehensive utilization of resources. Background technique [0002] Lithium iron phosphate battery has the characteristics of environmental protection, safety and low cost. Its market share is increasing year by year, and it is one of the main types of scrapped power batteries. Lithium iron phosphate batteries contain iron and phosphorus, which are nutrients for plant growth and have high economic value in agricult...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/00C05G3/40C05G3/80C05G3/90H01M10/0525H01M10/54
CPCC05B17/00C05G3/00C05G3/40C05G3/80C05G3/90H01M10/54H01M10/0525H01M2300/0008C05C3/00C05C9/00C05D9/00Y02P60/21
Inventor 张付申岳晓辉
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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