Producing process of sulfur-coated urea sustained and controlled release synergistic fertilizer

A technology of sulfur-coated urea and production process, which is applied in the direction of urea compound fertilizer, fertilizer mixture, nitrogen fertilizer, etc., can solve the problems of soil secondary pollution and low cost of coating materials, and achieve control of nutrient release, increase of nutrient and comprehensive utilization The effect of low production rate and production cost

Inactive Publication Date: 2014-10-22
云中英
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Problems solved by technology

[0004] The object of the present invention is to provide a slow-controlled release and synergistic fertilizer production process for sulfur-coated urea. First, molten liquid sulfur is used for coating treatment, and then molten paraffin is used for secondary coating and sealing treatment. The coating material The cost is low, which reduces the production cost, and the effect of slow and controlled release is good, which completely solves the problem of secondary soil pollution existing in traditional coated slow / controlled release fertilizers

Method used

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Embodiment 1

[0022] A slow and controlled release synergistic fertilizer production process of sulfur-coated urea, comprising the following steps:

[0023] (1) The large-grain urea with a particle size of 3-4mm is measured by an electronic belt scale and then enters the coating machine. The inlet temperature of the coating machine is 95°C-100°C, and the outlet temperature is 45°C-55°C to form a material curtain. The flow velocity is 5m / s and the flow rate is 10t / h;

[0024] (2) The temperature 100 ℃ hot air sent by the preheater is heat-exchanged with the above-mentioned material curtain downstream, so that the urea is preheated, and the preheating temperature requirement is 85 ℃;

[0025] (3) Coating molten sulfur at a temperature of 150°C under a pressure of 0.35MPa through multiple sets of nozzles, the thickness of the coating is 0.05mm, and the spraying pressure is 0.35MPa;

[0026] (4) The material after sulfur coating in step (3) is melted with paraffin wax at 145°C-155°C, and subje...

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Abstract

The invention discloses a producing process of a sulfur-coated urea sustained and controlled release synergistic fertilizer. The producing process comprises the steps of firstly carrying out coating treatment with molten liquid sulfur, and then carrying out secondary coating mouth-sealing treatment with molten paraffin wax. The producing process has the advantages that the coating material is low in cost, the production cost is reduced, the sustained and controlled release effect is good, and the problem that a traditional coated sustained / controlled release fertilizer has secondary pollution on soil is completely solved.

Description

technical field [0001] The invention relates to a fertilizer production process, in particular to a slow-controlled release and synergistic fertilizer production process of sulfur-coated urea, belonging to the field of fertilizer production processes. Background technique [0002] my country is a large agricultural country with a large population and relatively little land. It accounts for 9% of the world's land but feeds 22% of the world's population. Although my country's agricultural output has been increased by increasing the amount of chemical fertilizers used, in addition to the joy of high yields, the problem of environmental pollution is worrying. The effective nutrient volatilization and leaching of chemical fertilizers have reduced the utilization rate of fertilizers. It has caused a serious waste of resources, and also polluted the ecological environment of soil and water systems. [0003] The practice of agricultural production shows that due to the comprehensive...

Claims

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Application Information

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IPC IPC(8): C05G3/00C05G3/04C05C9/00C05G3/80
Inventor 云中英王恒涛杨鑫徐芹雷刘启前时钰淇
Owner 云中英
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