Composite sustained-release urea of organic materials and method of producing the same

An organic material and slow-release urea technology, applied in the agricultural field, can solve the problems of low production process cost, unsatisfactory nutrient slow-release effect, poor controlled-release performance, etc., to reduce agricultural costs, uniform and smooth product particles, and enhance slow-release effect of effect

Active Publication Date: 2009-07-29
秦皇岛五弦维爱科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Insoluble or slightly soluble inorganic material-coated slow-release fertilizers can be produced by open-type ordinary granulation equipment, which has low production process costs and low fertilizer prices, but its controlled-release performance is relatively poor, and the nutrient slow-release effect is not ideal.

Method used

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  • Composite sustained-release urea of organic materials and method of producing the same
  • Composite sustained-release urea of organic materials and method of producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The weathered coal material is crushed, sieved (≥80 mesh), and then subjected to fermentation and composting treatment (see "Solid Waste Composting and Organic Compound Fertilizer Production", Li Guoxue, Zhang Fusuo, 2000, Beijing: Chemical Industry Press ), after being decomposed, the organic materials are dried (2~3% water content), crushed (fineness ≥100 mesh), and added into the urine or molten urea before granulation of industrial synthetic urea at a weight ratio of 3:7 (temperature 125°C, mass percentage concentration 96%), stirring and mixing, the heating steam pressure in the urea melting tank is 1.0 MPa. Then it is sent to the high-tower spray granulation equipment for spray granulation. The heat preservation steam pressure of the urine pipeline is 0.25MPa, the material temperature in the granulator is 62°C, and the water content of the material after granulation is 3 to 5%. After granulation, it enters the drying cylinder for drying, which is the finished product....

Embodiment 2

[0026] The organic waste dregs from food factories, wood processing enterprises and lignin wastes from the paper industry are crushed and sieved (≥80 mesh), and then subjected to fermentation composting (method as in Example 1). After the decomposed, the organic materials are dried ( Water content 2~3%), crushed (fineness ≥100 mesh), added to the urine or molten urea before granulation of industrial synthetic urea in a ratio of 2:3 by weight (temperature 125℃, mass percentage concentration 96%) , Stirring and mixing, the heating steam pressure in the urea melting tank is 1.0MPa, and then sent to the high-tower shotcreting equipment for shotcreting. The heat preservation steam pressure of the urine pipeline is 0.25MPa, the material temperature in the granulator is 62°C, and the water content of the material after granulation is 3 to 5%. After granulation, it enters the drying cylinder for drying, which is the finished product. The inlet temperature of the dryer is 150°C, and the ou...

Embodiment 3

[0028] The organic materials such as crop stalks and husks are crushed and sieved (≥80 mesh), and then subjected to fermentation and composting (the method is as in Example 1). After they are decomposed, the organic materials are dried (with water content of 2 to 3%) and crushed (fine (Degree ≥100 mesh), add the urine or molten urea before granulation of industrial synthetic urea (temperature 125℃, mass percentage concentration 96%) in a weight ratio of 1:1, stir and mix, and heat steam in the urea melting tank The pressure is 1.0MPa, and then it is sent to the high tower shotcreting equipment for shotcreting. The heat preservation steam pressure of the urine pipeline is 0.25MPa, the material temperature in the granulator is 62°C, and the water content of the material after granulation is 3 to 5%. After granulation, it enters the drying cylinder for drying, which is the finished product. The inlet temperature of the dryer is 140°C and the outlet temperature is 55°C.

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Abstract

The invention discloses a composite slow-release urea of organic materials and a preparation method thereof, belonging to the field of agriculture. The composite slow-release urea of organic materials is prepared by carrying out melting, mixing reaction, prilling and drying on 30-50 parts by weight of low-release materials of organic materials and 50-70 parts by weight of urea raw material. The fertilizer is characterized in that the utilization of N fertilizer in current season is improved by 5-10% by organic-inorganic combination, C-N mutual control and nutrient slow release; the unemployed nitrogen in fertilizer is promoted to maintain in the soil; nitrogen fertility of soil is increased and nitrogenous fertilizer loss is reduced. The fertilizer is simple in manufacturing technology, easy in operation, low in production investment, derates the production cost of secondary processing of film-coated slow-release fertilizer, has the characteristics of wide raw material sources, high grain mechanical strength (mechanical strength is more than or equal to 12N), no deliquescence, convenient transportation and fertilization and the like and enjoys wide application prospect in production.

Description

Technical field [0001] The invention relates to an organic material composite slow-release urea and a preparation method thereof, and belongs to the field of agriculture. Background technique [0002] At present, the slow-release fertilizers developed at home and abroad are mainly coated slow-release fertilizers. There are two main types of coating materials, one is organic polymer (such as resin polyolefin), and the other is poorly water-soluble or micro Soluble inorganic materials (such as sulfur, phosphate rock powder, calcium magnesium phosphate fertilizer, etc.). The production of high molecular polymer coated slow-release fertilizer requires a special coating tower and solvent. The coating material is expensive and the production process cost is high. The coating material decomposes slowly in the soil and easily remains. However, the controlled release performance of polymer materials is better. Due to the high price, high molecular polymer coated slow-release fertilizers a...

Claims

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Application Information

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IPC IPC(8): C05C9/00C05G3/08C05G3/90
CPCY02P60/21
Inventor 赵秉强李燕婷李秀英李小平王丽霞
Owner 秦皇岛五弦维爱科技开发有限公司
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