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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, poor controlled-release performance, and unsatisfactory nutrient slow-release effect, so as to reduce agricultural costs, enhance the slow-release effect, and uniform product particles smooth effect

Active Publication Date: 2012-11-14
秦皇岛五弦维爱科技开发有限公司
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  • 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

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The weathered coal material is crushed, sieved (≥80 mesh), and fermented and composted (for the method, see "Solid Waste Composting and Organic Compound Fertilizer Production", edited by Li Guoxue and Zhang Fusuo, 2000, Beijing: Chemical Industry Press ), after being decomposed, the organic material is dried (water content 2~3%), pulverized (fineness ≥ 100 mesh), and the urine or molten urea before the industrial synthetic urea granulation is added in the ratio of 3: 7 by weight (temperature 125 DEG C, mass percentage concentration 96%), stirring and mixing, the heating steam pressure in the urea melting tank is 1.0MPa. Then send it to the high-tower spray granulation equipment for spray granulation. The steam pressure of the urine pipeline insulation is 0.25MPa, the temperature of the material in the granulator is 62°C, and the water content of the material after granulation is 3-5%. After granulation, enter the drying cylinder for drying, which is the finished produc...

Embodiment 2

[0026] Organic waste residues such as food factories, wood processing enterprises and paper industry lignin wastes are crushed, sieved (≥80 mesh), and fermented and composted (method as in Example 1), and the organic materials are dried after they are well decomposed ( water content 2-3%), pulverized (fineness ≥ 100 mesh), and added to the urine or molten urea (temperature 125°C, mass percentage concentration 96%) in the ratio of 2:3 by weight before granulation of industrially synthesized urea , stirring and mixing, the heating steam pressure in the urea melting tank is 1.0MPa, and then sent to the high-tower spray granulation equipment for spray granulation. The steam pressure of the urine pipeline insulation is 0.25MPa, the temperature of the material in the granulator is 62°C, and the water content of the material after granulation is 3-5%. After granulation, enter the drying cylinder for drying, which is the finished product. The inlet temperature of the dryer is 150°C a...

Embodiment 3

[0028] Organic materials such as crop stalks and chaff are crushed, sieved (≥80 mesh), and fermented and composted (as in Example 1). degree ≥ 100 mesh), add the urine or molten urea (temperature 125°C, mass percentage concentration 96%) in the ratio of 1:1 by weight before industrial synthetic urea granulation, stir and mix, and heat steam in the urea melting tank The pressure is 1.0MPa, and then sent to the high-tower spray granulation equipment for spray granulation. The steam pressure of the urine pipeline insulation is 0.25MPa, the temperature of the material in the granulator is 62°C, and the water content of the material after granulation is 3-5%. After granulation, enter 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 unemployednitrogen 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, belonging to the field of agriculture. Background technique [0002] At present, the slow-release fertilizers developed at home and abroad are mainly film-coated slow-release fertilizers. There are two types of film materials used, one is organic polymers (such as resin polyolefins), and the other is insoluble or slightly water-soluble fertilizers. Soluble inorganic materials (such as sulfur, phosphate rock powder, calcium magnesium phosphate fertilizer, etc.). The production of polymer-coated slow-release fertilizers requires special coating towers and solvents. The coating materials are expensive, and the production process costs are high. The coating materials decompose slowly in the soil and tend to remain. However, the controlled release performance of high molecular polymer materials is better. Due to the high price, polymer-coated slow-re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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