Reactive type sustained-release fertilizer compounded by nitrification inhibitor/urea formaldehyde and preparation method thereof

A technology of nitrification inhibitors and slow-release fertilizers, applied in fertilizer mixtures, applications, fertilization devices, etc., can solve problems such as ecological environmental pollution, nitrate excess, environmental pollution, etc., to reduce release, improve production capacity, and speed up sticking The effect of knot properties

Active Publication Date: 2010-09-01
SHANGHAI RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Second, environmental pollution
The production process of chemical fertilizers will not only have adverse effects on the surrounding environment, but also after the application of fertilizers, nitrogen nutrients will be leache

Method used

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  • Reactive type sustained-release fertilizer compounded by nitrification inhibitor/urea formaldehyde and preparation method thereof
  • Reactive type sustained-release fertilizer compounded by nitrification inhibitor/urea formaldehyde and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]In the 50% aqueous solution containing 60 grams of urea, add 162 grams of 37% formaldehyde solution and 84 grams of dicyandiamide, at this moment urea: formaldehyde: the mol ratio of dicyandiamide is 1: 2: 1, heat and mix at 55 ℃ To react, add 0.61 g of 98% sulfuric acid at the same time, control the pH value to 3-4, and perform polycondensation reaction for 2 hours to form a mixed slurry containing slow-release nitrogen. The above-mentioned mixed slurry is transported into the drum granulator, and the pulverized powdered potassium chloride, ammonium phosphate and filler are added, and it can be directly granulated to become a qualified nitrogen, phosphorus and potassium slow-release compound fertilizer.

Embodiment 2

[0035] In the 96% aqueous solution containing 600 grams of urea, add 162 grams of 37% formaldehyde solution and 84 grams of dicyandiamide, at this moment urea: formaldehyde: the mol ratio of dicyandiamide is 10: 2: 1, heat and mix at 95 ℃ , add 10.2 grams of 85% sulfuric acid at the same time, control the pH value of 3 to 4, and form a mixed slurry containing slow-release nitrogen in the polycondensation reaction for 0.5 hours, transport the above mixed slurry into a disc granulator, add Powdered potassium chloride, ammonium phosphate, and fillers can be directly granulated into qualified nitrogen, phosphorus, and potassium slow-release compound fertilizers.

Embodiment 3

[0037] In the 50% aqueous solution containing 60 grams of urea, add 162 grams of 37% formaldehyde solution and 168 grams of calcium cyanamide, at this moment urea: formaldehyde: the mol ratio of calcium cyanamide is 1: 2: 2, at 90 ℃ Heat and mix, add 1.4 grams of 90% phosphoric acid at the same time, control the pH value of 3 to 4, polycondensate for 3 hours to form a mixed slurry containing slow-release nitrogen, transport the above mixed slurry into a drum granulator, add after The crushed powdered potassium sulfate, ammonium phosphate, and fillers can be directly granulated into qualified nitrogen, phosphorus, and potassium slow-release compound fertilizers.

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Abstract

The invention relates to a reactive type sustained-release fertilizer compounded by nitrification inhibitor/urea formaldehyde and a preparation method thereof. The reactive type sustained-release fertilizer mainly comprises the following main raw materials of: the nitrification inhibitor, urea and formaldehyde, wherein the nitrification inhibitor is dicyandiamide or calcium cyanamide. The preparation method comprises the following steps of: according to a raw material proportion, adding the formaldehyde into urea melt or urea solution in proportion to obtain a mixture; simultaneously adding the nitrification inhibitor and a catalyst into the mixture and fully mixing the mixture to prepare slurry which contains sustained-release nitrogen; and then mixing the prepared slurry and components which contain phosphate fertilizer, potassic fertilizer, returned materials and the like to prepare the sustained-release compound fertilizer.

Description

technical field [0001] The present invention relates to a chemical fertilizer and a preparation method thereof, in particular to a composite reaction slow-release fertilizer obtained by polycondensation reaction using nitrification inhibitor dicyandiamide or calcium cyanamide, urea and formaldehyde and a preparation method thereof . Background technique [0002] Nitrogen fertilizer is an important means of production in agricultural production. Due to the particularity of nitrogen transformation in the soil and the irrational application of nitrogen fertilizer, the utilization rate of nitrogen fertilizer is only 30% to 35%, which not only causes a huge waste of economy and resources, but also poses a serious threat to the environment and food safety. [0003] Low nitrogen use efficiency generally creates two main problems: [0004] One is waste of resources. Based on the average annual nitrogen application rate of 25.3 million tons (converted to pure N) from 2001 to 2004 ...

Claims

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Application Information

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IPC IPC(8): C05G3/08C05G3/90
CPCY02P60/21
Inventor 曹卫宇何佩华陈国华周志英马征平
Owner SHANGHAI RES INST OF CHEM IND
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