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Improved sulfur coated thiourea slow release fertilizer and its manufacturing method

A technology of applying sulfur urea and slow-release fertilizer, which is applied in urea compound fertilizer, fertilizer mixture, nitrogen fertilizer, etc., can solve the problem of increased energy consumption, impact resistance and wear resistance of the coating of sealant-coated drum and conditioner-coated drum. It can reduce the energy consumption, good toughness and easy operation.

Active Publication Date: 2007-04-18
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

[0005] Although these sulfur-coated urea products generally have good slow-release characteristics after being made, the impact resistance and abrasion resistance of the coating are low. After handling, transportation, blending and coating operations, the coating will be mechanically damaged. Degradation, resulting in poor sustained release, in addition, due to the increase of the sealant-coated drum and the increased energy consumption of the modifier-coated drum, the operation is complicated and expensive
And some patents announce that the sulfur layer is coated with a polymer, which has good release and impact strength, such as US5599374, but the price is expensive and the operation is more complicated, so it is difficult to be accepted

Method used

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  • Improved sulfur coated thiourea slow release fertilizer and its manufacturing method

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Embodiment 1

[0016] 740 grams of urea, preheated at 60°C, coated with 230 grams of sulfur and kept at 155°C, and then coated with 30 grams of EVACOTE produced by Canadian International Group in the same drum  7089, kept at 95°C for coating, then cooled to 35°C by fluidized bed cooler 1, and then cooled to 25°C by solid heat exchanger to obtain the finished product (34-0-0-23S).

Embodiment 2

[0018] 700 grams of urea, preheated at 60°C, coated with 270 grams of sulfur and kept at 155°C, and then coated with 30 grams of EVACOTE produced by Canadian International Group in the same drum  7089, kept at 95°C for coating, then cooled to 35°C by fluidized bed cooler 1, and then cooled to 25°C by solid heat exchanger to obtain the finished product (32-0-0-27S).

Embodiment 3

[0020] 740 grams of urea, preheated at 60°C, coated with 245 grams of sulfur and kept at 155°C, and then coated with 15 grams of EVACOTE produced by Canadian International Group in the same drum  7089, kept at 92°C for coating, then cooled to 35°C by fluidized bed cooler 1, and then cooled to 25°C by solid heat exchanger to obtain the finished product (34-0-0-24.5S).

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Abstract

The present invention discloses a kind of sulfur-coated urea slowly-released fertilizer and its preparation method. It is characterized by that the urea granule surface has first coating sulfur, and on the urea granule sulfur coating layer a composite coating layer containing hydrocarbon wax and polymer also is set. The above-mentioned two coating layers can be implemented by adopting one-step process and utilizing two coolers.

Description

1. Technical field: [0001] The present invention relates to an improved sulfur-coated urea slow-release fertilizer and its manufacturing method, more specifically to the slow-release fertilizer coated with urea according to the composition coating sequence of sulfur layer, hydrocarbon wax and polymer, and the fertilizer has Very good controlled release and good toughness, improved impact strength and wear resistance, meanwhile, the composition coating of hydrocarbon wax and polymer is biodegradable and environmentally friendly. 2. Background technology: [0002] Sulfur-coated urea (SCU) slow-release fertilizer, first developed by TVA in the United States in 1957, is a relatively mature slow-release fertilizer. In the conventional method of manufacturing sulfur-coated urea, granular urea with a nominal size range of 1.7-2.9mm has been preheated in a fluidized bed heater at 70-80°C before being added to a rotating horizontal drum-shaped drum (its length 12 feet and 5.5 feet i...

Claims

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Application Information

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IPC IPC(8): C05C9/00C05G3/08C05G3/90
Inventor 吕云峰李金凯
Owner 汉枫缓释肥料(江苏)有限公司
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