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Sulfur-coated urea fertilizer and preparation method thereof

A sulfur-coated urea and sulfur-coated technology, which is applied in fertilizer mixtures, fertilization devices, applications, etc., can solve the problems of unstable nutrient release characteristics, high production costs, and high prices of fertilizers, and is suitable for large-scale popularization and production. The effect of cost reduction and simple production process

Active Publication Date: 2010-08-18
BEIJING ACADEMY OF AGRICULTURE & FORESTRY SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the sealing layers used in production are paraffin and other substances. Although these substances are cheap, their sealing performance is not good, and the nutrient release characteristics of fertilizers are unstable.
Although the slowing and controlling performance of fertilizers is greatly improved by using a sulfur-coated layer and a polymer-coated layer, due to the high price of this type of sealing agent material, and the fertilizer must be sprayed and coated twice, the production cost is high, making this kind of slowing and controlling The popularization and application of fertilizer has been greatly restricted

Method used

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  • Sulfur-coated urea fertilizer and preparation method thereof
  • Sulfur-coated urea fertilizer and preparation method thereof
  • Sulfur-coated urea fertilizer and preparation method thereof

Examples

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Effect test

Embodiment 1

[0018] 1) Preheat 900kg of urea to 66°C with hot air, heat 100kg of sulfur to 150°C to dissolve, and spray it onto the surface of urea granules through a nozzle under a gauge pressure of 10MPa to obtain sulfur-coated urea granules;

[0019] 2) Prepare sealant component a and component b:

[0020] ①Preparation of sealant component a urea-formaldehyde resin: Add 280 g of an aqueous solution with a mass percentage concentration of 37% formaldehyde into the reaction kettle, add a 30% mass percentage concentration of NaOH aqueous solution to adjust the pH value to 7.5-8, and then heat up To 40°C, add 80g urea and 1.5g polyvinyl alcohol (number average molecular weight is 15000, molecular weight distribution is 2000-20000), continue to heat up to 80-90°C, keep warm for 30 minutes, then add 20g urea and 10g melamine to continue Reaction, after incubating at 80-90°C for 15 minutes, add formic acid aqueous solution with mass percent concentration of 20% to adjust the pH value to 4-6, c...

Embodiment 2

[0029] 1) Preheat 650kg of urea to 66°C with hot air, heat 350kg of sulfur to 150°C to dissolve, and spray it onto the surface of urea granules through a nozzle under a gauge pressure of 10MPa to obtain sulfur-coated urea granules;

[0030] 2) Prepare sealant component a and component b:

[0031]①Preparation of sealant component a urea-formaldehyde resin: Add 280 g of an aqueous solution with a mass percentage concentration of 37% formaldehyde into the reaction kettle, add a 30% mass percentage concentration of NaOH aqueous solution to adjust the pH value to 7.5-8, and then heat up To 40°C, add 80g urea and 1.5g polyvinyl alcohol (number average molecular weight is 15000, molecular weight distribution is 2000-20000), continue to heat up to 80-90°C, keep warm for 30 minutes, then add 20g urea and 10g melamine to continue Reaction, after incubating at 80-90°C for 15 minutes, add formic acid aqueous solution with mass percent concentration of 20% to adjust the pH value to 4-6, co...

Embodiment 3

[0039] 1) Preheat 800kg of urea to 66°C with hot air, heat 200kg of sulfur to 150°C to dissolve, and spray it onto the surface of urea granules through a nozzle under a gauge pressure of 10MPa to obtain sulfur-coated urea granules;

[0040] 2) Prepare sealant component a and component b:

[0041] ①Preparation of sealant component a urea-formaldehyde resin: Add 280 g of an aqueous solution with a mass percentage concentration of 37% formaldehyde into the reaction kettle, add a 30% mass percentage concentration of NaOH aqueous solution to adjust the pH value to 7.5-8, and then heat up To 40°C, add 80g urea and 1.5g polyvinyl alcohol (number average molecular weight is 15000, molecular weight distribution is 2000-20000), continue to heat up to 80-90°C, keep warm for 30 minutes, then add 20g urea and 10g melamine to continue Reaction, after incubating at 80-90°C for 15 minutes, add formic acid aqueous solution with mass percent concentration of 20% to adjust the pH value to 4-6, c...

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Abstract

The invention discloses a sulfur-coated urea fertilizer and a preparation method thereof. The preparation method of the sulfur-coated urea fertilizer comprises the following steps: 1) spraying sulfur heated to 150 DEG C on the surfaces of urea particles preheated to 66 DEG C under the pressure of 10 MPa to obtain sulfur-coated urea particles; and 2) mixing a sealant component a, a sealant component b and talc powder well, coating the surfaces of the sulfur-coated urea particles obtained in a step 1) with the mixture and drying the obtained product to obtain the sulfur-coated urea fertilizer, wherein the sealant component a is urea formaldehyde resin, and the sealant component b is a mixture consisting of ammonium chloride, ammonium persulfate, citric acid, hexamethyl tetra-ammonium and zinc sulphate. The sulfur-coated urea fertilizer provided by the invention has the advantages of obviously reduced production cost, coating effect equivalent to that of urea fertilizers taking paraffin as sealant, simple production process and great suitability for large-scale popularization and use.

Description

technical field [0001] The invention relates to the field of urea fertilizers, in particular to a sulfur-coated urea fertilizer and a preparation method thereof. Background technique [0002] Since TVA in the United States adopted sulfur-coating technology to produce slow-release nitrogen fertilizers in 1961, sulfur-coated urea has experienced more than 40 years of development, and the technology is becoming more and more mature. Sulfur-coated fertilizers can not only make the fertilizers slow-acting, but also sulfur is the fourth nutrient element needed by crops. At present, countries such as Canada, the United States, Japan, and China have all developed sulfur-coated urea products with their own characteristics. With the increase in the amount of chemical fertilizers worldwide, the amount of sulfur-coated slow-release fertilizers is also increasing steadily. , The average annual growth rate of daily slow-release / controlled-release fertilizer consumption is about 4% to 5%....

Claims

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Application Information

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IPC IPC(8): C05G3/08C05G3/90
Inventor 谷佳林徐秋明刘宝存邹国元杨宜斌
Owner BEIJING ACADEMY OF AGRICULTURE & FORESTRY SCIENCES
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