Method for producing urea formaldehyde polyglutamic acid compound fertilizer from phosphorus and potassium mixed acid raffinate

By employing a multi-stage neutralization reaction system and ammoniation pretreatment, the problem of easy loss of polyglutamic acid activity in the production of compound fertilizer from phosphorus and potassium mixed acid extraction residue was solved, achieving uniform nutrient release and physical stability of particles, thereby improving the functional stability and resource utilization efficiency of compound fertilizer.

CN122010613APending Publication Date: 2026-05-12KINGENTA NORSTERRA CHEM CO LTD
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Patent Information

Application Number
CN202512020071.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-30
Publication Date
2026-05-12

AI Technical Summary

Technical Problem

In existing technologies, when producing compound fertilizer from the residual liquid of phosphorus and potassium mixed acid extraction, polyglutamic acid is prone to structural degradation and destruction of active groups due to acid-base fluctuations and high temperatures, making it difficult to fully exert its growth-promoting and stress-resistant functions, thus affecting the slow-release and synergistic effects of the fertilizer.

Method used

A multi-stage neutralization reaction system is adopted, the pH value is controlled in a stepwise manner, a γ-type polyglutamic acid solution is added, and ammonia pretreatment and coating process are combined to form a stable acid-base environment. The slow-release properties of urea-formaldehyde are utilized to protect the functional components through energy recycling.

Benefits of technology

It effectively reduces the loss of polyglutamic acid activity, improves the binding capacity of phosphorus and potassium nutrients, achieves uniform nutrient release and physical stability of particles, and enhances the functional stability and resource utilization efficiency of compound fertilizer.

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Abstract

The invention relates to the technical field of fertilizer production and industrial solid waste resource utilization, and particularly discloses a method for producing a urea formaldehyde polyglutamic acid compound fertilizer from phosphorus and potassium mixed acid raffinate. According to the method, phosphorus-potassium mixed acid slurry, polyglutamic acid and urea formaldehyde are used as main raw materials, and the preparation method comprises the steps of raw material reaction and mixed acid preparation, multi-stage neutralization and functional agent mixing, slow-release nitrogen source mixing, returned material pretreatment and granulation, screening and wrapping, process waste heat recovery and the like. The product disclosed by the invention can be applied as a special compound fertilizer with nutrient slow release and biological stimulation functions, and has the advantages of balanced nutrients, high utilization rate and capability of improving soil. Besides, according to the preparation method, high-valued resource utilization of the phosphorus-potassium mixed acid raffinate is achieved, and through ammoniation pretreatment of returned materials and systematic recovery of reaction waste heat, the preparation method has the advantages that the raw material cost is reduced, the product performance is improved, and the production energy consumption is reduced.
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