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Production method of large-granule slow-release fertilizer

A production method and slow-release fertilizer technology, which is applied in the field of large-grain slow-release fertilizer production methods, can solve the problems of complex nutrient release mechanism and high cost, and achieve the effects of short process flow, less returning materials, and convenient and flexible operation

Inactive Publication Date: 2013-03-20
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Physicochemical slow-release fertilizers use both physical and chemical methods to treat fertilizers. The nutrient release mechanism of this type of slow-release fertilizer is more complicated, and the slow-release effect is better, but the cost is generally higher.

Method used

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  • Production method of large-granule slow-release fertilizer

Examples

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Comparison scheme
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example 1

[0026] Coating material configuration: Mix 22.5 kg of toluene diisocyanate, 7.5 kg of glycerin, 1.5 kg of epoxy resin, 1.5 kg of xylene, and 1 kg of diatomaceous earth for later use.

[0027] First, 250 kg of granular urea (46% nitrogen) preheated to 70 degrees is added to the drum coating machine, and the coating material configured above is evenly added to the material in the drum coating machine for coating. After the coating is completed, 315 kg of monoammonium phosphate (containing 11% nitrogen and 44% phosphorus pentoxide), 300 kg of potassium chloride (50% of potassium oxide), and 10 kg of 0.5% polyacrylamide solution are evenly added in sequence. Mix evenly, and put the mixture into an extrusion granulator for extrusion granulation. The semi-finished product after granulation is placed at 80 degrees for 5 hours, then naturally cooled and sieved to obtain the finished product.

example 2

[0029] Coating material configuration: Mix 24 kg of toluene diisocyanate, 6 kg of tung oil, 2 kg of epoxy resin, 3 kg of xylene, and 1.5 kg of diatomaceous earth for later use.

[0030] First, 275 kg of granular urea (46% nitrogen) preheated to 75 degrees is added to the drum coating machine, and the coating material configured above is evenly added to the material in the drum coating machine for coating. After the coating is completed, 225 kg of monoammonium phosphate (containing 11% nitrogen and 44% phosphorus pentoxide), 460 kg of potassium sulfate (50% potassium oxide content), and 15 kg of 0.2% polyacrylamide solution are evenly added in sequence, and mixed Evenly, the mixture is added to the extrusion granulator for extrusion granulation. The semi-finished product after granulation was placed at 80 degrees for 2 hours and then naturally cooled and sieved to obtain a finished product with a particle diameter of 40 mm and a single particle weight of 38 grams.

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Abstract

The invention relates to a production method of a large-granule slow-release fertilizer, belonging to the technical field of manufacturing of fertilizers. The production method comprises the following steps: adding granular urea which is preheated to 50-100 DEG C into a rotating drum coating machine, and coating by using a mixed solution of polyisocyanate, polyalcohol, epoxy resin, dimethylbenzene and inorganic powdery filler as a coating material; after finishing the coating, adding monoammonium phosphate, potassium chloride (or potassium sulfate) and polyacrylamide solution, evenly mixing, and adding the mixture into an extrusion granulator to carry out extrusion granulation; and standing the granulated semi-finished product at 60-100 DEG C for 1-10 hours for curing, naturally cooling, and screening to obtain the finished product. The large-granule slow-release fertilizer with the diameter of 10-100 millimeters and the weight of 10-500g can be produced according to the size of the mold of the extrusion granulator. Compared with the common small-granule slow-release fertilizer, the large-granule slow-release fertilizer has the advantages of lower cost, stable nutrient release, uniform nutrition in every granule, and fixed weight, can implement precise fertilizer application, and reduces the fertilizer application frequency and labor investment.

Description

technical field [0001] The invention relates to a production method of large-grain slow-release fertilizer, which belongs to the field of fertilizer manufacturing technology, and specifically relates to the production of large-grain slow-release fertilizer by using urea, monoammonium phosphate, potassium chloride (or potassium sulfate) and the like as main raw materials technical method. Background technique [0002] Slow-release fertilizer refers to a type of fertilizer in which the nutrient release rate of the fertilizer is much lower than the normal dissolution rate of the soluble fertilizer nutrient in the soil. After the fertilizer is applied to the soil, the nutrient is slowly converted into an effective nutrient that can be absorbed and utilized by plants. This type of fertilizer The nutrient release process of fertilizers is limited by technical measures, so that the nutrient release mode is coordinated or synchronized with the crop nutrient uptake. There are many t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G5/00
Inventor 张文辉谷守玉万亚珍
Owner ZHENGZHOU UNIV
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