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Preparation method of slow-release nitrogen fertilizer

A nitrogen fertilizer and slow-release technology, applied in the direction of nitrogen fertilizer, ammonium salt fertilizer, fertilization device, etc., can solve the problems that the release rate of fertilizer nutrients is greatly affected, the loss of nutrient elements is wasteful and economical, and limits large-scale application, etc., to achieve high ion exchange and Adsorption performance, improvement of nitrogen utilization rate, and effect of reducing soil nutrient loss

Pending Publication Date: 2018-07-27
CHINA NAT RICE RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the nitrogen utilization rate of fertilizers in my country is only about 30%. The loss and waste of a large number of nutrient elements not only brings huge economic losses to the society, but also pollutes the environment on which human beings rely, such as the atmosphere, soil, and water, causing serious damage. Non-point source pollution
Recent studies have shown that the research and development of new slow / controlled release fertilizers can basically synchronize the nutrient release rate with crop nutrient absorption, which can greatly improve fertilizer utilization efficiency and reduce agricultural non-point source pollution, which meets the requirements of the national sustainable development strategy. Controlled-release fertilizers, such as sulfur-coated urea, resin-coated urea, and sulfur-resin double-coated urea, have factors such as high cost of coating materials, complex granulation process, and environmental factors that have a greater impact on the nutrient release rate of fertilizers. Large-scale application in agricultural production

Method used

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  • Preparation method of slow-release nitrogen fertilizer
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  • Preparation method of slow-release nitrogen fertilizer

Examples

Experimental program
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Effect test

Embodiment 1

[0025] (1). After the natural zeolite mordenite and clinoptilolite are mechanically pulverized, they are mixed by 1:1 for subsequent use after passing through a 100 mesh sieve; 100 parts of the above-mentioned mixed zeolite are added to 900 parts of 3% hydrochloric acid solution by mass fraction, Stir and soak at room temperature for 12 hours and then centrifuge. Repeat this process 3 times. Finally, dry the zeolite at 100°C and crush it through a 100-mesh sieve to obtain acidic modified zeolite powder;

[0026] (2) The modified zeolite powder is mixed with the granulation aid powder passing through a 100 mesh sieve in a mass ratio of 85:15, and put into a drum granulator for granulation after metering by a microcomputer;

[0027] (3) The above-mentioned granulated zeolite is sent to the closed drum fluidized bed after being dried and screened, and the ammonia gas generating device connected with the fluidized bed is first started so that the ammonia concentration in the fluidi...

Embodiment 2

[0029] (1). After the natural zeolite mordenite and clinoptilolite are mechanically pulverized, they are mixed by 1:1 for subsequent use after passing through a 100 mesh sieve; 100 parts of the above-mentioned mixed zeolite are added to 900 parts of a mass fraction of 2% hydrochloric acid solution, Stir and soak at room temperature for 12 hours and then centrifuge. Repeat this process 3 times. Finally, dry the zeolite at 100°C and crush it through a 100-mesh sieve to obtain acidic modified zeolite powder;

[0030] (2) The modified zeolite powder is mixed with the granulation aid powder passing through a 100 mesh sieve in a mass ratio of 85:15, and put into a drum granulator for granulation after metering by a microcomputer;

[0031] (3) The above-mentioned granulated zeolite is sent to the closed drum fluidized bed after being dried and screened, and the ammonia gas generating device connected with the fluidized bed is first started to maintain the ammonia concentration in the ...

Embodiment 3

[0033] (1). After the natural zeolite mordenite and clinoptilolite are mechanically pulverized, they are mixed by 1:1 for subsequent use after passing through a 100 mesh sieve; 100 parts of the above-mentioned mixed zeolite are added to 900 parts of 3% hydrochloric acid solution by mass fraction, Stir and soak at room temperature for 12 hours and then centrifuge. Repeat this process 3 times. Finally, dry the zeolite at 100°C and crush it through a 100-mesh sieve to obtain acidic modified zeolite powder;

[0034] (2) The modified zeolite powder is mixed with the granulation aid powder passing through a 100 mesh sieve in a mass ratio of 85:15, and put into a drum granulator for granulation after metering by a microcomputer;

[0035] (3) The above-mentioned granulated zeolite is sent to the closed drum fluidized bed after being dried and screened, and the ammonia gas generating device connected with the fluidized bed is first started to maintain the ammonia concentration in the fl...

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Abstract

The invention provides a preparation method of slow-release nitrogen fertilizer. The preparation method comprises the following steps: adding zeolite particles into an acid solution or a metal chloride solution; after stirring, separating; drying obtained solids and crushing and sieving to obtain modified zeolite powder; mixing the modified zeolite powder and a granulation auxiliary agent, and granulating and molding; putting the molded zeolite particles into a sealed fluidized bed; injecting nitrogen gas into the fluidized bed to adsorb nitrogen gas molecules into the molded zeolite particles; then injecting an atomized urea solution into the fluidized bed to adsorb urea molecules into the zeolite particles, wherein the mass of the urea solution is 20 percent to 40 percent of the mass ofthe molded zeolite particles; drying and sieving to obtain the slow-release nitrogen fertilizer. The preparation method provided by the invention has the advantages of reasonable design, convenient raw material sources, simple operation, low cost and strong practicability.

Description

technical field [0001] The invention belongs to the technical field of fertilizer production, in particular to a method for preparing slow-release nitrogen fertilizer based on zeolite. Background technique [0002] Rice is one of the main food crops in my country. Its planting area accounts for 1 / 4 of the country's food crops, and its output accounts for more than half. There are two peak periods of fertilizer demand in rice growth, namely the tillering period and the booting period, in which urea is a high-quality nitrogen fertilizer with high nitrogen content, fast fertilizer efficiency and large dosage. After urea is applied to the soil, it will be rapidly decomposed and converted into ammonia under the action of urease and lost. At the same time, the growing environment of rice from turning green to tillering stage needs sufficient water and nitrogen nutrients, and water-soluble nutrients are prone to runoff loss. At present, the nitrogen utilization rate of fertilizers...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/08C05C9/00C05G3/90
CPCC05C3/00C05C9/005C05G3/90C05C9/00C05D9/00C05D9/02Y02P60/21
Inventor 曹小闯金千瑜李晓艳朱练峰张均华朱春权
Owner CHINA NAT RICE RES INST