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Preparation method of slow-release and long-acting compound fertilizer

A compound fertilizer, long-term technology, applied in inorganic fertilizers, ammonium salt fertilizers, calcareous fertilizers, etc., can solve the problems of high manufacturing cost, few fertilizer components, complicated preparation, etc. high effect

Inactive Publication Date: 2018-06-22
广西亿润生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing slow-release fertilizers mainly have the following disadvantages: 1) the fertilizer effect is single, and the fertilizer components contained are few; 2) the preparation is complicated, and the manufacturing cost is relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The preparation method of slow-release long-acting compound fertilizer comprises the following steps:

[0022] 1) Mix urea with a particle size of 0.15-0.25mm, ammonium chloride with a particle size of 0.25-0.5mm, monoammonium phosphate with a particle size of 0.5-1mm, and kaolin with a particle size of 1-2mm according to the weight of 3.5:1.8:1.2:2.5 Specific mixing, when mixing, adding a starch slurry with a concentration of 10wt% to adjust the water content of the mixture to 5wt%, to obtain a mixed monomer fertilizer;

[0023] 2) The mixed monomer fertilizer is granulated with a granulator, the initial temperature of the granulation zone is 63°C, liquid ammonia and a concentration of 88wt% phosphoric acid are fed into the granulation, the phosphoric acid contains 0.5wt% calcium chloride, mixed The input amount of monomer fertilizer is 20t / h, the input amount of liquid ammonia is 0.35t / h, the input amount of phosphoric acid is 0.25t / h, and the output of the granulator...

Embodiment 2

[0026] The preparation method of slow-release long-acting compound fertilizer comprises the following steps:

[0027] 1) Put urea with a particle size of 0.15-0.25mm, ammonium chloride with a particle size of 0.25-0.5mm, monoammonium phosphate with a particle size of 0.5-1mm, and kaolin with a particle size of 1-2mm according to the weight of 3:1.8:1.5:2 Specific mixing, when mixing, adding a starch slurry with a concentration of 12wt% to the water content of the mixture is adjusted to 5.5wt%, to obtain a mixed monomer fertilizer;

[0028] 2) The mixed monomer fertilizer is granulated with a granulator, the initial temperature of the granulation zone is 65°C, and liquid ammonia and a concentration of 70wt% phosphoric acid are fed into the granulation, the phosphoric acid contains 0.6wt% calcium chloride, mixed The input amount of monomer fertilizer is 25t / h, the input amount of liquid ammonia is 0.3t / h, the input amount of phosphoric acid is 0.25t / h, and the output of the gran...

Embodiment 3

[0031] The preparation method of slow-release long-acting compound fertilizer comprises the following steps:

[0032] 1) Put urea with a particle size of 0.15-0.25mm, ammonium chloride with a particle size of 0.25-0.5mm, monoammonium phosphate with a particle size of 0.5-1mm, and kaolin with a particle size of 1-2mm according to the weight of 3.5:2:1:2.5 Specific mixing, when mixing, adding a starch slurry with a concentration of 15wt% to the water content of the mixture is adjusted to 4.5wt%, to obtain a mixed monomer fertilizer;

[0033] 2) The mixed monomer fertilizer is granulated with a granulator, the initial temperature of the granulation zone is 63°C, liquid ammonia and a concentration of 90wt% phosphoric acid are fed into the granulation, and the phosphoric acid contains 0.1wt% calcium chloride, mixed The input amount of monomer fertilizer is 20t / h, the input amount of liquid ammonia is 0.4t / h, the input amount of phosphoric acid is 0.2t / h, and the output of the granu...

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Abstract

The invention discloses a preparation method of slow-release and long-acting compound fertilizer. The preparation method comprises the following steps: 1) mixing urea, ammonium chloride, monoammoniumphosphate and kaolin according to the weight ratio of (3 to 4) to (1.5 to 2) to (1 to 1.5) to (2 to 3); in an adding process, adding starch slurry until the moisture content of a mixture is 4.5 to 5.5weight percent, so as to obtain mixed monomer fertilizer; 2) granulating the mixed monomer fertilizer by utilizing a granulating machine; in a granulating process, introducing liquid ammonia and phosphoric acid, wherein the phosphoric acid contains calcium chloride and a discharged material of the granulating machine is wet fertilizer; 3) drying the wet fertilizer by utilizing a drying machine; after drying, cooling and sieving to obtain a finished product. The method is simple and easy to operate and low in preparation cost; the prepared fertilizer contains various nutrient components and has good fertilizer efficiency and long fertilizer effect.

Description

technical field [0001] The invention relates to the technical field of fertilizers, and relates to a preparation method of a slow-release long-acting compound fertilizer. Background technique [0002] Slow-release fertilizers are also called slow-release fertilizers or controlled-release fertilizers. The compounds containing nutrients in the fertilizers are released slowly in the soil or the release rate of nutrients can be controlled to a certain extent for the continuous absorption and utilization of crops. The purpose of using slow-release fertilizers: 1) Reduce the loss of fertilizer nutrients, especially nitrogen in the soil; 2) Reduce the number of fertilization operations, save labor and costs; 3) Avoid damage to seeds or seedlings caused by excessive fertilization . Slow-acting fertilizers are divided into three categories: 1) insoluble compounds in water, such as magnesium ammonium phosphate, etc.; 2) coated or coated fertilizers, such as sulfur-coated urea; 3) car...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G3/08C05G3/90
CPCC05B7/00C05G3/00C05G3/90C05C3/00C05C9/00C05D3/00C05D9/00
Inventor 方南元钟利平
Owner 广西亿润生物科技有限公司
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