Shell body nitrogen fixing slow release composite fertilizer

A compound fertilizer and nitrogen fixation technology, applied in fertilizer mixtures, fertilization devices, applications, etc., can solve the problems of only 35% utilization rate, less than 40% effective utilization rate, high cost of polymer inert film, and achieve low cost, adsorption The effect of high efficiency and strong wrapping ability

Inactive Publication Date: 2007-06-20
天津芦阳肥业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The effective utilization rate of conventional chemical fertilizers is less than 40%, especially the utilization rate of nitrogen fertilizer is only 35%
However, the cost of using polymer inert film is high, and the price of the slow-release fertilizer produced by it is as high as 900-1500 US dollars in the international market. Therefore, field crops cannot accept it at all.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Prepare the shell nitrogen-fixing slow-release compound fertilizer containing nitrogen, phosphorus and potassium, and its ingredients are:

[0041] Solid material: organic diatomaceous earth 7%

[0042] Calcium Sulfate 8%

[0043] Ordinary Calcium Superphosphate 8%

[0044] Monoammonium Phosphate 29%

[0045] Potassium Chloride 16.5%

[0046] Bentonite 3%

[0047] Liquid urea: 28.5%

Embodiment 2

[0049] The production process of the shell nitrogen-fixing slow-release compound fertilizer of embodiment 1:

[0050] While the shell nitrogen-fixing slow-release compound fertilizer adopts the above formula, the production process has the following changes in the process conditions compared with the current urea spray granulation technology:

[0051] (1) The spraying pressure is higher and the atomization is finer

[0052] The spraying pressure of urea solution is above 0.4Mpa, and the nozzle is changed from spraying urea solution alone to adding hot compressed air and high-pressure water vapor for atomization, so the urea droplets are finer, the pressure is higher, and the compound fertilizer granules are harder and wrapped. more uniform.

[0053] (2) Higher granulation temperature

[0054] In the granulation process, the granulation is changed from adding water to adding high-pressure steam, and the pressure is above 0.8Mpa, so the granulation temperature and pressure are...

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PUM

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Abstract

The present invention relates to a shell nitrogen-fixing slowly-released composite fertilizer. It is characterized by that its composition includes the following components: (by wt%) 5-10% of organic diatomite, 6-10% of calcium sulfate, 6-10% of general calcium perphosphate, 23-35% of monoammonium phosphate, 10-20% of potassium chloride and 23-33% of urea.

Description

technical field [0001] The invention belongs to the technical field of chemical fertilizers, in particular to a nitrogen-fixing slow-release compound fertilizer with a casing. Background technique [0002] At present, the long-term and large-scale application of chemical fertilizers not only increases the yield of crops, but also has a great negative impact on soil, crops and the environment. Studies have shown that conventional chemical fertilizers have a large amount of nutrients, concentrate and release quickly in the early stage of application, which will be lost due to leaching, decomposition, and volatilization, and may even reduce crop production due to poisoning and burning seedlings. Among them, nitrogen fertilizer has the greatest loss and the lowest utilization rate. The effective utilization rate of conventional chemical fertilizers is less than 40%, especially the utilization rate of nitrogen fertilizer is only 35%. The loss of fertilizer not only wastes limit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G1/00C05G3/00
Inventor 杨金宝李全成李云利杨在得
Owner 天津芦阳肥业股份有限公司
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