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.
CN1948227AActive Publication Date: 2007-04-18汉枫缓释肥料(江苏)有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
汉枫缓释肥料(江苏)有限公司
Publication Date
2007-04-18

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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.
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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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