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Method for producing urea formaldehyde controlled-release compound fertilizer

A production method and urea-formaldehyde slow-release technology are applied in fertilization devices, fertilizer mixtures, applications and other directions, can solve the problems of high production cost and complex production process, and achieve the effects of low production cost, short process flow, and not easy to agglomerate

Active Publication Date: 2014-07-23
HENAN LEEF FERTILIZER
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The quality of the product produced by this method is good, but the production process is complicated and the production cost is high
And under strong acid condition, in compound fertilizer liquid, add urea, formaldehyde solution and make the technology of urea-formaldehyde compound fertilizer through one-step reaction, there is no report at home and abroad

Method used

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  • Method for producing urea formaldehyde controlled-release compound fertilizer

Examples

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example 1

[0019] Add 358kg of urea, 1800kg of water, 200kg of potassium chloride and 136kg of monoammonium phosphate into the reactor, stir at room temperature to dissolve it to obtain a mixed solution, the stirring speed is 350r / min, and then add 305kg of the mass concentration to 36% to 38%. Add the formaldehyde solution into the reaction kettle, add 1kg of catalyst, stir, raise the temperature to 30°C, adjust the pH value of the solution to 1 with phosphoric acid, and keep it warm for 40 minutes to obtain a compound fertilizer slurry, and pump the mixed slurry into the spraying machine Granulation in the granulation dryer. After the dried granular urea-formaldehyde compound fertilizer is screened and cooled, the unqualified particles with a particle size of less than 1 mm are directly returned to the granulator for granulation, and the particles larger than 4 mm are crushed and returned to granulation. Re-granulate in the machine, and the qualified particles are packaged into finished...

example 2

[0021] Add 272 g of urea, 2000 kg of water, 200 kg of potassium sulfate, 227 kg of monoammonium phosphate, 2 kg of copper sulfate pentahydrate, 4 kg of zinc sulfate heptahydrate, 2 kg of magnesium sulfate heptahydrate and 2 kg of borax into the reaction kettle, stir to dissolve at room temperature to obtain a mixed solution , the stirring speed is 400r / min, and then 288kg of formaldehyde solution with a mass concentration of 36% to 38% is added to the reaction kettle, 3kg of catalyst is added, stirred, the temperature is raised to 45°C, the pH value of the solution is adjusted to 2.5 with sulfuric acid, and the temperature is kept React for 2 hours to obtain compound fertilizer slurry, and pump the mixed slurry into the spray granulation dryer for granulation. After the dried granular urea-formaldehyde compound fertilizer is screened and cooled, unqualified particles with a particle size of less than 1 mm Directly return to the granulator for granulation. The particles larger t...

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Abstract

The invention relates to a method for producing a urea formaldehyde controlled-release compound fertilizer, belongs to the technical field of fertilizer manufacture, and aims to produce the finished fertilizer product by adding a certain amount of potassic fertilizer, phosphatic fertilizer and catalyst in the process of producing a urea formaldehyde controlled-release fertilizer, further reacting in the existence of strong acid to synthesize urea formaldehyde compound fertilizer slurry, spraying granulation, screening and cooling. The dosage of the catalyst is 0.2-2 percent of the total mass of urea; copper sulfate pentahydrate, zinc sulfate heptahydrate, borax and other raw materials are added in the reacting process, and the requirement of crops on medium trace nutritional elements can be met. The method has the advantages of simple operation process, flexible production, low cost and the like, and the product is comprehensive in nutrition and has the characteristics of uniform and full particles, high strength and nutrition, adjustable controlled-release property and the like. Therefore, the method has great advantages on production process and economy.

Description

technical field [0001] The invention relates to a production method of urea-formaldehyde slow-release compound fertilizer, which belongs to the technical field of fertilizer manufacturing, and specifically relates to the production of urea-formaldehyde slow-release compound fertilizer by using urea, formaldehyde solution, potassium chloride (or potassium sulfate), and monoammonium phosphate as raw materials. The technical method of compound fertilizer. Background technique [0002] Slow-release fertilizers are also called slow-acting fertilizers. The compounds containing nutrients in the fertilizers are released slowly in the soil or the rate of nutrient release can be controlled to a certain extent for the continuous absorption and utilization of crops. Compared with quick-acting fertilizers, slow-release fertilizers release nutrients slowly, and the fertilizer effect is long-term and stable, which can greatly improve the utilization rate of fertilizers. The slow-release f...

Claims

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Application Information

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IPC IPC(8): C05G3/00C05G3/04C05G3/80
Inventor 张文辉万亚珍谷守玉梅丹丹
Owner HENAN LEEF FERTILIZER
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