Slow release urea and preparation method thereof

A technology for slow-release urea and urea, which is applied in the field of slow-release urea and its preparation, can solve the problems of secondary environmental pollution, complicated process and high cost, and achieves the effects of low price, abundant sources and simple production method.

Active Publication Date: 2014-08-13
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 attached figure 2 , using the industrial urea production process, based on the calculation of 1 t / h stable urea production, its nitrogen content is 0.42 tons, and 5% bentonite, 0.5% polyacrylamide, and 0.5% sodium sulfate are pumped at a constant speed through the powder delivery pump Put it into the urea melting slurry pipeline after the second steaming, and make it mix uniformly by a pipeline mixer, respectively 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 with one end closed, After cooling and crystallizing, place it horizontally in 1 L of water at room temperature for dissolution, and measure the urea content in the solution. The cumulative dissolution rate-time relationship of pure urea and slow-release urea is shown in Table 1.

[0038] Table 1 Example 1 novel slow-release urea standing water dissolution test result

[0039]

Embodiment 2

[0042] A kind of slow-release urea, it is made from the raw material of following weight (kg):

[0043]

[0044] The preparation method comprises the following steps:

[0045] (1) Add natural bentonite, polyacrylamide, and sodium sulfate into the urea melting slurry pipeline, and mix the urea slurry obtained by melting the urea with the pipeline mixer evenly by weight to obtain the 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 slow-release urea and ordinary urea were subjected to sand column leaching experiment, the method is as follows: sequentially put 0.5g of absorbent cotton and 150g of sand (30 mesh to 60 mesh) into the leaching device by wet packing, and then put equal amount of nitrogen into the leaching device respectively. Spread net-type slow-release urea and ordinary urea on the sand in their respective leaching pipe...

Embodiment 3

[0051] A kind of slow-release urea, it is made from the raw material of following weight (kg):

[0052]

[0053]

[0054] Referring to Example 2 for the preparation method, the obtained slow-release urea and ordinary urea were subjected to a sand column leaching experiment, and 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, in particular to a slow-release urea and a preparation method thereof. Background technique [0002] Fertilizer is an important means of production in modern agriculture. It plays a very important role in ensuring food security and increasing 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 variety of nitrogen fertilizer because of its high nitrogen content, low production cost, and 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", it is estimated that urea production accounted for 70% of ...

Claims

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Application Information

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Patent Type & Authority Patents(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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