Preparation method of sulfur coated urea for rice

A technology for coating urea and rice with sulfur, which can be used in applications, fertilizer mixtures, fertilization devices, etc., and can solve the problems of low production cost and the like

Inactive Publication Date: 2012-12-26
汉枫缓释肥料(江苏)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved in the present invention is to overcome the deficiencies of the existing sulfur-coated urea production process for rice, provide a method to effectively solve the pr

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0007] Example 1: Large particles of urea are passed through flowing molten sulfur to coat the urea, and then molten paraffin is sprayed, and then cooled to room temperature (the above is a conventional process). After the cooling process, add dolomite powder (CaO.MgO.2H 2 O), after mixing and sieving through the trommel, the conditioning agent under the sieve is returned from the screw feeder to the addition port of the trommel, according to the specification of sulfur-coated urea, and the addition amount and remaining amount of the conditioning agent are calculated to control the adsorption of the conditioning agent The amount is 2% of the weight of sulfur-coated urea, and the oversize is the finished sulfur-coated urea.

Example Embodiment

[0008] Example 2: The operation steps and methods are the same as above, except that the conditioning agent is diatomaceous earth, the particle size is 100 mesh, and the adsorption capacity is 1.2%.

Example Embodiment

[0009] Example 3: The operation steps and methods are the same as above, except that the conditioning agent is dolomite powder with a particle size of 105 mesh and an adsorption capacity of 1.2%.

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PUM

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Abstract

The present invention discloses a preparation method of a sulfur coated urea for rice. According to the preparation method, large particle urea passes through flowing melting sulfur to achieve urea coating; then melting paraffin wax is sprayed, and cooling is performed to a room temperature; after cooling, a conditioning agent is added to the sulfur coated urea, wherein the conditioning agent is dolomite powder or diatomite, and is adsorbed on the surface of the sulfur coated urea particles, an absorption amount is 1.2-3% of the weight of the sulfur coated urea, and addition of the conditioning agent is performed inside a roller sieve; after mixing screening, the resulting material on the sieve is the finished product. The sulfur coated urea prepared by the method of the present invention has the following characteristics that: a surface structure of the sulfur coated urea particles is changed, diffusion speed of water on the surface of the sulfur coated urea particles is increased so as to rapidly sink in the water, a floatation problem of the existing sulfur coated urea is effectively solved, a fertilizer application is improved, production cost is relatively low, and product quality is not affected.

Description

technical field [0001] The invention relates to a method for preparing sulfur-coated urea for rice, belonging to the technical field of slow-release fertilizers. Background technique [0002] Sulfur-coated urea (SCU for short) is a coated slow-release nitrogen fertilizer. In the soil environment, urea gradually diffuses through the coating, mainly through cracks, small cavities and incomplete natural formation on the coating surface. The structure releases nutrients slowly. Sulfur-coated urea, as a kind of slow-release fertilizer, is increasingly widely used. Compared with ordinary quick-release fertilizers, it has the following advantages: improve fertilizer efficiency and high utilization rate; reduce water pollution and avoid soil compaction; reduce fertilization times and comprehensive costs; effectively reduce Salt index, improve the quality of work; sulfur is a medium element, which can provide nutrients for crops. At present, the production process of sulfur-coated ...

Claims

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Application Information

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IPC IPC(8): C05G3/08C05G3/90
Inventor 喻武远陈年军李天兵
Owner 汉枫缓释肥料(江苏)有限公司
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