Preparation method of elemental sulfur based ammonium phosphate slow release fertilizer

A technology of sulfur-based ammonium phosphate and slow-release fertilizer, applied in ammonium orthophosphate fertilizers, phosphate fertilizers, alkaline orthophosphate fertilizers, etc., can solve the problems of inability to produce ammonium phosphate products with affinity, accelerated burning speed, and poor liquid sulfur dispersion. , to achieve long-term release, promote absorption, and prevent product agglomeration

Inactive Publication Date: 2018-11-06
GUIYANG KAILIN FERTILIZER CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, sulfur is a secondary flammable solid, and the combustion speed is greatly accelerated when mixed with oxidants. It forms explosive mixtures with oxidants such as chlorate, nitrate, perchlorate, and permanganate, which will cause an explosion after a little impact or friction. Sulfur should not be in direct contact with copper, silver and their alloys. It is very easy to react with these substances at room temperature. Sulfur is a poor conductor of electricity and is negatively charged after friction. If sulfur dust floats in the air to form an explosive mixture, it is easy to be ignited by static electricity dust explosion
[0004] At present, the production method of elemental sulfur-based ammonium phosphate is mainly to wrap sulfur powder on the surface of ammonium phosphate products, but it is easy to cause sulfur to fall off, or add liquid sulfur to the raw material phosphoric acid for ammonia neutralization and granulation, etc., but the dispersion of liquid sulfur Poor, can not produce affinity with ammonium phosphate products, which can easily cause safety hazards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The present embodiment provides a kind of preparation method of elemental sulfur-based ammonium phosphate slow-release fertilizer, comprising:

[0023] S1 sulfur sol: mix sulfur with 70% ethanol in a mass ratio of 1:3, add emulsifier with sulfur content of 1%, stabilizer with 5% and mix evenly, then add to sulfur in 3 times Mix 1.5 times the amount of water evenly;

[0024] S2 blending: mixing sulfur sol with 2% dispersant of sulfur sol and 2 times of diammonium phosphate;

[0025] S3 granulation;

[0026] S4 coating: Soak the granulated particles in an ethanol solution containing 1.04 g of tetraethyl orthosilicate for 4 hours, wherein the mass fraction of the ethanol solution is 70%;

[0027] S5 cleaning: wash the coated fertilizer with alcohol three times in centrifugation, and dry it in vacuum at 50°C for 9 hours to obtain the silicon dioxide membrane material-coated elemental ammonium sulfophosphate slow-release fertilizer;

[0028] The emulsifier is composed of ...

Embodiment 2

[0032] The present embodiment provides a kind of preparation method of elemental sulfur-based ammonium phosphate slow-release fertilizer, comprising:

[0033] S1 Sulfur Sol: Mix sulfur with 60% ethanol at a mass ratio of 1:2, add 1% emulsifier and 2% stabilizer and mix evenly, then add to sulfur in 3 times Mix 1.5 times the amount of water evenly;

[0034] S2 blending: mixing sulfur sol with 2% dispersant of sulfur sol and 1 times of diammonium phosphate;

[0035] S3 granulation;

[0036] S4 Coating: Soak the granulated particles in an ethanol solution containing 0.208 g of tetraethyl orthosilicate for 2 hours, wherein the mass fraction of the ethanol solution is 60%;

[0037] S5 cleaning: wash the coated fertilizer with alcohol three times in centrifugation, and dry it in vacuum at 45°C for 8 hours to obtain the silicon dioxide membrane material-coated elemental ammonium sulfophosphate slow-release fertilizer;

[0038] The emulsifier is composed of diacetyl tartrate monogl...

Embodiment 3

[0042] The present embodiment provides a kind of preparation method of elemental sulfur-based ammonium phosphate slow-release fertilizer, comprising:

[0043] S1 Sulfur Sol: Mix sulfur with 65% ethanol at a mass ratio of 2:5, add emulsifier with sulfur content of 3%, stabilizer with 4% and mix evenly, then add to sulfur in 4 times Mix evenly with 1.8 times the amount of water;

[0044] S2 blending: mixing sulfur sol with 3% dispersant of sulfur sol and 1.5 times of diammonium phosphate;

[0045] S3 granulation;

[0046] S4 coating: Soak the granulated particles in an ethanol solution containing 0.80 g of tetraethyl orthosilicate for 3 hours, wherein the mass fraction of the ethanol solution is 65%;

[0047] S5 Cleaning: wash the coated fertilizer with alcohol three times in centrifugation, and dry it in vacuum at 48°C for 8.5 hours to obtain the silicon dioxide membrane material-coated elemental ammonium sulfophosphate slow-release fertilizer;

[0048] The emulsifier is com...

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PUM

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Abstract

The invention relates to the technical field of fertilizer processing, in particular to a preparation method of an elemental sulfur based ammonium phosphate slow release fertilizer. The preparation method comprises the following steps of preparation of sulfur sol, mixing, pelleting, coating and cleaning. The preparation method provided by the invention is simple in technology and safe to operate;a prepared coated elemental sulfur based ammonium phosphate product well controls the release rate of nitrogen, phosphorus and sulfur, realizes long-acting release of nutrient elements; and in addition, the contained sulfur and silicon components can promote absorption of other nutrient elements and improve the stress resistance growth of crops.

Description

technical field [0001] The invention relates to the technical field of fertilizer processing, in particular to a preparation method of elemental sulfur-based ammonium phosphate slow-release fertilizer. Background technique [0002] Sulfur is one of the essential nutritional elements for crops and one of the basic elements that constitute sulfur-containing amino acids and proteins. It can synthesize other important biologically active substances, participate in physiological activities such as enzyme activation, and can also increase other essential elements such as phosphorus and nitrogen. Utilization of nutrient elements, therefore, sulfur can regulate plant metabolism, increase yield and improve quality. [0003] Elemental sulphur-based ammonium phosphate contains high concentration of sulfur, and the cost of transportation and application is lower than other sulfur fertilizers; secondly, it releases slowly and has a long validity period. Elemental sulphur-based ammonium p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
CPCC05B7/00C05G3/00C05G5/30C05D9/00
Inventor 吴有丽项双龙罗焕虎廖吉星何润林罗付浪徐立钦何花王采艳唐丽君韩朝应
Owner GUIYANG KAILIN FERTILIZER CO LTD
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