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Slow release urea and preparation method thereof

A technology of slow-release urea and urea, applied in the field of slow-release urea and its preparation, can solve problems such as complex process, high cost, and secondary pollution of the environment, and achieve the effect of abundant sources, simple production method, and low price

Active Publication Date: 2013-01-30
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned processes achieve slow release by synthesizing urea analogues with low solubility or spraying water-proof materials on the surface of urea particles, all of which have problems such as high cost, complicated process, and possible secondary pollution of the environment, which limit the popularization and application

Method used

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  • Slow release urea and preparation method thereof
  • Slow release urea and preparation method thereof
  • Slow release urea and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Refer to the manual attached figure 2 , Adopting industrialized urea production process, calculated according to the production of 1 t / h stable urea, its nitrogen content is 0.42 tons, and 5% bentonite, 0.5% polyacrylamide, and 0.5% sodium sulfate are pumped through a powder transfer pump. Pour the urea melted slurry pipeline after the second steaming, and mix it evenly through the pipeline mixer. Pour the obtained slow-release slurry and the original urea slurry solution into a glass tube with an inner diameter of 1 cm and a length of 10 cm, which is closed at one end. After cooling and crystallization, it was placed horizontally in 1 L of water at room temperature to dissolve and the urea content in the solution was determined. The cumulative dissolution rate-time relationship of pure urea and sustained-release urea is shown in Table 1.

[0038] Table 1 Experimental results of static water dissolution of the new sustained-release urea in Example 1

[0039]

Embodiment 2

[0042] A sustained-release urea, which is prepared from the following weight (kg) raw materials:

[0043]

[0044] The preparation method includes the following steps:

[0045] (1) Add natural bentonite, polyacrylamide, and sodium sulfate into the urea melt pipeline, and the urea slurry obtained after melting with urea through a pipeline mixer is evenly mixed by weight to obtain a mixed slurry;

[0046] (2) The mixed slurry enters the fluidized bed through the nozzle to complete the granulation process and produce large particles of slow-release urea.

[0047] The obtained sustained-release urea and ordinary urea were subjected to sand column leaching experiment, the method is as follows: 0.5g absorbent cotton and 150g sand (30 mesh to 60 mesh) were wet packed into the leaching device in turn, and then the same amount of nitrogen was built in Net-type slow-release urea and ordinary urea are spread on the sand in the respective leaching tubes, then covered with 30g dry sand, leached wi...

Embodiment 3

[0051] A slow-release urea, which is prepared from the following weight (kg) raw materials:

[0052]

[0053]

[0054] The preparation method refers to Example 2, and the obtained sustained-release urea and ordinary urea were subjected to a sand column leaching experiment. The leaching rate results are shown in Table 3:

[0055] Table 3 Example 3 Addition method cumulative dissolution rate sand column leaching experiment

[0056]

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Abstract

The invention discloses a slow release urea, which comprises the following effective components in parts by weight: 85-98.8 parts of urea, 1-14% parts of bentonite, 0.01-0.5 part of polyacrylamide and 0.01-0.5 part of sodium salt or solution of the sodium salt on the basis of the sodium content. The invention provides a new thought for lowering the urea releasing rate, the slow release action on the urea is different from coated urea and stable urea, the slow release action of the slow release urea is through the diffusion process of moisture in a urea crystal, and water-proof layers are formed layer by layer from outside to inside along with moisture osmosis so as to achieve the slow release purpose.

Description

Technical field [0001] The invention relates to the field of slow-release urea, specifically a slow-release urea and a preparation method thereof. Background technique [0002] Fertilizer is an important means of production for modern agriculture. It plays a very important role in ensuring food security and promoting farmers' income. It is an important basic industry related to the national economy and people's livelihood. Nitrogen is the most important nutrient element for crop growth. Among nitrogen fertilizers, urea is the most important type of nitrogen fertilizer due to its high nitrogen content, low production cost, convenient transportation and storage. The proportion of urea in nitrogen fertilizer gradually increased during the "Eleventh Five-Year Plan" period, the proportion of urea production in nitrogen fertilizer rose from 55.8% to more than 60%. At the end of the "Twelfth Five-Year Plan", the proportion of urea production in nitrogen fertilizer is expected to increas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05C9/00
Inventor 倪晓宇吴跃进余立祥张红李玉顺赵连紫邱冠男刘斌美吴林
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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