Coated slow releasing fertilizer and its prepn

A slow-release fertilizer and packaged technology, applied in the form of fertilizer, organic fertilizer, fertilizer mixture, etc., can solve the problems of high fertilizer production cost and large investment in equipment, and achieve the effect of improving the quality of agricultural products, low production cost and easy realization

Inactive Publication Date: 2006-05-17
INST OF SOIL & FERTILIZER SHANDONG ACAD OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production of slow and controlled release fertilizers by organic polymer fluidized bed coating technology has many defects, mainly in the high production cost of fertilizers and the large investment in equipment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056]Embodiment 1: Get 400 kilograms of ordinary urea and add in the compound fertilizer granulation pan of 2.5 meters in diameter, open the granulation pan (normal speed), add 3.0 kilograms of urease inhibitors, 15.0 kilograms of lightly burned magnesium, 30.0 kilograms of common calcium magnesium phosphate fertilizers kg, 3.0 kg of zinc oxide and 22 kg of refined bentonite; spray the sulfuric acid aqueous solution with 30% content of mass until the coating material is completely wrapped on the surface of the urea particles. Coated urea enters a cooling cylinder with a diameter of 1.8 meters and a length of 12 meters for air-cooling treatment. After the fertilizer coming out of the cooling cylinder is sieved, the coated slow-release fertilizer is obtained.

Embodiment 2

[0057] Embodiment 2: Get 400 kilograms of large granular urea and add in the compound fertilizer granulation pan of 2.5 meters in diameter, open the granulation pan (normal speed), add 2.6 kilograms of urease inhibitors, 16.0 kilograms of lightly burned magnesium, common calcium magnesium phosphate fertilizer 32.0 kilograms, 3.5 kilograms of zinc oxide and 25 kilograms of refined bentonite; spray the sulfuric acid aqueous solution of 30% content by mass, until the coating material is all wrapped on the surface of urea particles. Coated urea enters a cooling cylinder with a diameter of 1.8 meters and a length of 12 meters for air-cooling treatment. After the fertilizer coming out of the cooling cylinder is sieved, the coated slow-release fertilizer is obtained.

Embodiment 3

[0058] Embodiment 3: get 400 kilograms of the compound fertilizer mass percentage (wherein nitrogen, phosphorus, potassium are respectively 15%, 8%, 12%) of 35% of nitrogen, phosphorus and potassium content to add in the compound fertilizer granulation dish of diameter 2.5 meters, open Granulating disc (normal speed), add 1.2 kg of urine enzyme inhibitor, 12.0 kg of light burnt magnesium, 24.0 kg of ordinary calcium magnesium phosphate fertilizer, 2.0 kg of zinc oxide and 20.0 kg of refined bentonite; spray 30% sulfuric acid aqueous solution until The coating material is completely wrapped on the surface of the NPK compound fertilizer particles. The coated compound fertilizer enters a cooling cylinder with a diameter of 1.8 meters and a length of 12 meters for air-cooling treatment, and the fertilizer coming out of the cooling cylinder is sieved to obtain a wrapped slow-release fertilizer.

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PUM

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Abstract

The present invention belongs to the field of slowly releasing fertilizer technology, and the coated slow releasing fertilizer has components including urea or nitrogen fertilizer, phosphate fertilizer and potash fertilizer, urease inhibitor, lightly burnt magnesia, fused calcium magnesium phosphate, zinc oxide, humic acid and refined bentonite. All the components are set inside pelletizing disc and sprayed with water solution of sulfuric acid, coating material is coated on to the surface of urea, and through further cold wind treatment and sieving; the coated slow releasing fertilizer is produced. The present invention has controlled slow releasing of fertilizer components to meet the requirement for crop to grow, and can reduce fertilizer consumption, prevent the environmental pollution of fertilizer, and improve soil quality.

Description

(1) Technical field [0001] The invention relates to a packaged slow-release fertilizer and a preparation method thereof, belonging to the technical field of slow-release fertilizers. (2) Background technology [0002] Macroelement chemical fertilizers are water-soluble compounds. The main types of nitrogen fertilizers are urea, ammonium sulfate, ammonium chloride and ammonium bicarbonate. Nitrogen fertilizers are easily lost after being applied to the soil. The ways of loss include leaching, gas loss and fixation. The utilization rate of nitrogen fertilizer is only about 30%, and a large amount of losses. Phosphate fertilizers are easily fixed by the soil after being applied to the soil, and even cause losses through leaching and runoff, and the utilization rate is only about 20%. Potassium fertilizer can also be lost through leaching and runoff in the soil, and its utilization rate is slightly higher, only about 35%. Fertilizer loss not only causes waste, but also serious...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G1/00C05C9/00C05D9/02C05F11/02C05G3/00C05G3/90C05G5/00
CPCY02P60/21
Inventor 刘兆辉江丽华张文君林海涛郑福丽王梅
Owner INST OF SOIL & FERTILIZER SHANDONG ACAD OF AGRI SCI
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