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Ammonium magnesium phosphate-coated fertilizer and preparation method thereof

A magnesium ammonium phosphate coating and magnesium ammonium phosphate technology, which is applied to ammonium orthophosphate fertilizers, alkaline orthophosphate fertilizers, ammonium salt fertilizers, etc., can solve the problems of complex production process and short fertilizer release cycle, and achieve extended release cycle, reduce brittleness, and improve impact resistance

Active Publication Date: 2018-02-02
WUHAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of short fertilizer release period and complex production process in the prior art

Method used

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  • Ammonium magnesium phosphate-coated fertilizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 100kg of fertilizer with a particle size of 3-4mm is added to the blast fluidized bed, preheated at 80°C, and 5kg of soybean oil preheated at 80°C is sprayed on the surface of the fertilizer. Spray 18kg of ammonium magnesium phosphate powder with a particle size of 200-270 mesh on the surface of the fertilizer sprayed with binder, dry at 80°C for 60 minutes, and finally spray 4kg of paraffin wax melted at 80°C on the fertilizer wrapped with ammonium magnesium phosphate, Prepare magnesium ammonium phosphate coated fertilizer.

[0029] Among them, the fertilizer granules include: ammonium phosphate 16wt%, ammonium sulfate 40wt%, potassium dihydrogen phosphate 34wt%, chelated copper 0.4wt%, chelated iron 0.4wt%, chelated magnesium 0.8wt%, chelated 0.4wt% of zinc, 0.5wt% of chelated calcium, 0.5wt% of borax and 7wt% of palygorskite powder. The particle size of the palygorskite powder is 200-300 mesh, and water is added to granulate by drum granulation.

Embodiment 2

[0031] 100kg of fertilizer with a particle size of 3-4mm is added to the blast fluidized bed, preheated at 65°C, and 3kg of cottonseed oil preheated at 65°C is sprayed on the surface of the fertilizer. Spray 15kg of ammonium magnesium phosphate powder with a particle size of 200-270 mesh on the surface of the fertilizer coated with binder, dry at 65°C for 30 minutes, and finally spray 2kg of paraffin wax melted at 65°C on the fertilizer wrapped with ammonium magnesium phosphate. Prepare magnesium ammonium phosphate coated fertilizer.

[0032] Among them, the fertilizer granules include: ammonium phosphate 15wt%, ammonium sulfate 35wt%, potassium dihydrogen phosphate 25wt%, chelated copper 0.2wt%, chelated iron 0.2wt%, chelated magnesium 0.7wt%, chelated 0.2wt% of zinc, 0.4wt% of chelated calcium, 0.5wt% of borax, and 3wt% of palygorskite powder. The particle size of the palygorskite powder is preferably 200-300 mesh, and water is added to granulate by drum granulation.

Embodiment 3

[0034] 100kg of fertilizer with a particle size of 3-4mm is added to the blast fluidized bed, preheated at 85°C, and 5kg of palm oil preheated at 85°C is sprayed on the surface of the fertilizer. Spray 20kg of ammonium magnesium phosphate powder with a particle size of 200-270 mesh on the surface of the fertilizer sprayed with binder, dry at 85°C for 60 minutes, and finally spray 4kg of paraffin wax melted at 85°C on the fertilizer wrapped with ammonium magnesium phosphate, Prepare magnesium ammonium phosphate coated fertilizer.

[0035] Among them, the fertilizer granules include: ammonium phosphate 20wt%, ammonium sulfate 35wt%, potassium dihydrogen phosphate 30wt%, chelated copper 0.5wt%, chelated iron 0.5wt%, chelated magnesium 0.9wt%, chelated 0.4wt% of zinc, 0.5wt% of chelated calcium, 0.7wt% of borax, and 10wt% of palygorskite powder. The particle size of the palygorskite powder is preferably 200-350 mesh, and water is added to granulate by drum granulation.

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Abstract

The invention discloses an ammonium magnesium phosphate-coated fertilizer and a preparation method thereof. The preparation method includes spraying ammonium magnesium phosphate powder on the surfacesof fertilizer granules sprayed with preheated binders evenly, drying and spraying a sealing agent on the fertilizer granules coated with the ammonium magnesium phosphate. The ammonium magnesium phosphate-coated fertilizer prepared according to the preparation method has the advantages that with paraffin as the sealing agent, the coating effect can be better and the nutrient release period of thefertilizer can be prolonged, brittleness of an ammonium magnesium phosphate coating can be reduced and impact resistance of the coated fertilizer is improved; the ammonium magnesium phosphate-coated fertilizer can be up to the standards of slow-release fertilizers, the initial nutrient release rate is not more than 15%, the accumulated nutrient release rate in 28 days is not more than 80%, and theaccumulated nutrient release rate in the nutrient release period is not less than 80%.

Description

technical field [0001] The invention belongs to the field of agricultural production, and more specifically relates to a magnesium ammonium phosphate coated fertilizer and a preparation method thereof. Background technique [0002] Chemical fertilizers play an important role in agricultural production, and 50% of the increase in food production in developing countries comes from the role of chemical fertilizers. However, the seasonal utilization rate of chemical fertilizers is low (at present, the utilization rate of nitrogen fertilizer in the current season in my country is only 20% to 35%, the utilization rate of phosphorus fertilizer is 10% to 20%, and the utilization rate of potassium fertilizer is 30% to 60%, which is far lower than that of developed countries in the world. At the same time, the large-scale application of chemical fertilizers has also caused a series of environmental problems such as soil salinization, compaction, and water eutrophication. [0003] Howe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
CPCC05B7/00C05G3/00C05G5/30C05C3/00C05D3/00C05D5/00C05D9/00C05D9/02
Inventor 李建芬程群鹏李红霞秦振华宋光森
Owner WUHAN POLYTECHNIC UNIVERSITY
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