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Phosphogypsum agricultural fertilizer and preparation method and application thereof

A technology of phosphogypsum and granules, which is applied in application, nitrogen fertilizer, agriculture, etc., can solve the problems of unsatisfactory fertilizer efficiency of urea phosphogypsum, and achieve the effects of easy industrialization promotion and implementation, simple operation process and low cost

Pending Publication Date: 2021-12-31
GUIZHOU RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the researcher found that the fertilizer efficiency of urea phosphogypsum is still unsatisfactory through pot experiments on the urea phosphogypsum obtained by the prior art.

Method used

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  • Phosphogypsum agricultural fertilizer and preparation method and application thereof
  • Phosphogypsum agricultural fertilizer and preparation method and application thereof
  • Phosphogypsum agricultural fertilizer and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Take phosphogypsum through grinding and granulation to form particles with a particle size between 2.8mm and 5mm, place the particles at a temperature of 300°C, and calcinate them for 15 minutes under the protection of a nitrogen atmosphere to obtain phosphogypsum particles;

[0031] Take urea, add water according to the mass ratio of liquid to solid ratio of 1:1.5, melt the urea into a solution, then immerse the phosphogypsum particles, stir at 100r / min for 5min, filter out the particles, and store them at -5°C to 0 Freeze-drying treatment between ℃ for 1h, that is.

Embodiment 2

[0033] Such as figure 2 As shown, corn stalks were crushed into 1 cm particles, added to phosphogypsum for grinding, and the added amount accounted for 1% of the mass of phosphogypsum, and other steps were prepared according to the preparation method of Example 1 to obtain phosphogypsum agricultural fertilizer.

Embodiment 3

[0035] Such as image 3 As shown, the phosphogypsum particles prepared in Example 2 were sent to a refrigerator with a storage temperature of <5°C for cooling treatment for 10 minutes, and then the phosphogypsum agricultural fertilizer was prepared according to the preparation method in Example 2.

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Abstract

The invention relates to the technical field of solid waste resource utilization, in particular to a phosphogypsum agricultural fertilizer and a preparation method and application thereof. The method comprises the following steps: grinding and granulating phosphogypsum so as to expose impurities in the phosphogypsumin the grinding process, and performing granulation forming to facilitate subsequent phosphogypsum agricultural fertilizer forming; performing calcination treatment to realize escape of internal volatile components from inside to outside of the particles, and promoting formation of a plurality of pores in the particles; and after the agricultural fertilizer is melted into a liquid state, immersing the phosphogypsum particles into the liquid, and performing stirring, so that the phosphogypsum particles adsorb nutrients of the agricultural fertilizer, the phosphogypsum and the agricultural fertilizer are organically compounded, and the fertilizer efficiency of the phosphogypsum agricultural fertilizer is improved. The structural performance of the phosphogypsum particles is enhanced and the pulverization and dispersion time of the phosphogypsum is changed through a grinding-granulating-calcining process, and the slow-release effect is improved.

Description

technical field [0001] The invention relates to the technical field of solid waste resource utilization, in particular to a phosphogypsum agricultural fertilizer and its preparation method and application. Background technique [0002] Phosphogypsum is the industrial waste discharged from the wet-process phosphoric acid process. Generally, every ton of wet-process phosphoric acid (in P 2 o 5 In total), 4 to 4.5 tons of phosphogypsum will be produced. The stockpiling of a large amount of phosphogypsum not only easily leads to environmental pollution and waste of land resources, but also makes it difficult for phosphogypsum to be utilized as a resource, resulting in a heavy burden on phosphorus chemical enterprises and poor economic benefits. [0003] At present, the comprehensive utilization of phosphogypsum resources has been preliminarily studied, and corresponding results have been achieved, making phosphogypsum widely used in building materials, chemicals, and agricultu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G3/40C05G5/12
CPCC05G3/00C05G3/40C05G5/12C05C9/00C05D3/02C05D9/00
Inventor 周昌平熊艳林陈梅梅司孝刚王文章彭星运田光雨
Owner GUIZHOU RES INST OF CHEM IND
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