Internal absorption type quick-acting and slow-release fertilizer and preparation method thereof

A compound fertilizer and adsorption technology, applied in urea compound fertilizer, organic fertilizer, inorganic fertilizer, etc., can solve the problem that nitrate nitrogen and amide nitrogen cannot be mixed

Inactive Publication Date: 2019-04-05
河北百禾丰化肥有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that nitrate nitrogen and amide nitrogen cannot be mixed, the present invention provides a preparation method of internal adsorption type quick-acting-slow-release compound fertilizer. ~1.5mm) as the fertilizer core, the pretreated heavy calcium porous framework material (TSP, chemical formula: Ca(H 2 PO 4 ) 2 ) as a shell layer, wrapped on the surface of urea masterbatch to make composite structure fertilizer particles, and then mixed with nitrate nitrogen and ammonium nitrogen to granulate, using heavy calcium porous framework material to absorb nitrate nitrogen and ammonium nitrogen, and isolate nitrate nitrogen Nitrogen and urea, to solve the problem that nitrate nitrogen and amide nitrogen cannot be mixed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] This embodiment provides a method for preparing an internal adsorption type quick-acting-slow-release compound fertilizer, which is carried out according to the following steps and operating conditions:

[0033] S1: Material pretreatment: 25 parts by weight of heavy calcium materials are stacked and ammonified to reduce the acidity of heavy calcium materials. The specific operation is: spray ammonia (concentration 25%~28%) on the surface of heavy calcium materials, spray The amount is 10%~15% of the mass of the heavy calcium material. Then mix the heavy calcium material with ammonium carbonate into a pile, and stack it for 40-45 days at 30-40°C under ventilated conditions to reduce the acidity of the heavy calcium material. The heavy calcium is heavy calcium superphosphate, the content of available phosphorus is ≥ 43.5%, and the particle size is 0.5-2.5mm, which is purchased commercially.

[0034] S2: Coating: Heat 55 parts by weight of small granule urea (0.2~1.5mm) m...

Embodiment 2

[0038] This embodiment provides a method for preparing an internal adsorption type quick-acting-slow-release compound fertilizer, which is carried out according to the following steps and operating conditions:

[0039] S1: Material pretreatment: carry out drying ammoniation treatment on 20 parts by weight of heavy calcium material to reduce the acidity of heavy calcium material. At the bottom of the dryer, pass ammonia gas into the dryer from the bottom of the dryer, so that the ammonia gas passes through the heap of heavy calcium materials from bottom to top for 2 to 3 days to reduce heavy calcium acidity of the material. There is an air distribution bottom plate at the bottom of the dryer, and there are a number of small ventilation holes on the air distribution bottom plate. The heavy calcium is heavy calcium superphosphate, the content of available phosphorus is ≥ 43.5%, and the particle size is 0.5-2.5mm, which is purchased commercially.

[0040] S2: Coating: Heat 55 pa...

Embodiment 3

[0044] This embodiment provides a method for preparing an internal adsorption type quick-acting-slow-release compound fertilizer, which is carried out according to the following steps and operating conditions:

[0045] S1: Material pretreatment: 15 parts by weight of heavy calcium materials are treated with a combination of stacking ammoniation and drying ammoniation to reduce the acidity of heavy calcium materials. 25%~28%) sprayed on the surface of the heavy calcium material, the spraying amount is 10%~15% of the mass of the heavy calcium material, and then the heavy calcium material and ammonium carbonate are mixed into piles, and stacked at 30~40°C under ventilation 15 days; (2) In the dryer, at 40~60°C, pile the heavy calcium material on the bottom of the dryer, and pass ammonia gas into the dryer from the bottom of the dryer, so that the ammonia gas Pass through the heap of heavy calcium materials from bottom to top for 0.5 to 1 day to reduce the acidity of heavy calcium...

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Abstract

The invention relates to a preparation method of an internal absorption type quick-acting and slow-release fertilizer. The preparation method comprises S1, performing material pretreatment, specifically, ammonifying calcium triple superphosphate materials to reduce pH of the calcium triple superphosphate materials to obtain a pH-regulated calcium triple superphosphate skeleton material; S2, heating small-grain-size urea masterbatch inside a rotary drum to 60-80 DEG C, spraying bonding agent onto the surface of the urea masterbatch through an atomizing nozzle to ensure that the surface of all the urea masterbatch is stuck with the bonding agent, and then dispersing the calcium triple superphosphate skeleton material from the S1 onto the surface of the urea masterbatch to obtain urea-cored and calcium triple superphosphate-shelled composite structured fertilizer particles, wherein the bonding agent is composed of 65-75% of tung oil and 25-35% of paraffin; S3, adding ammonium nitrogen, nitrate nitrogen, monomammonium phosphate and potassium fertilizer into the rotary drum for mixing with the composite structured fertilizer particles produced in the S2, and performing pelletizing; S4,drying the pellets at 90-120 DEG C, drying down and screening the dried pellets through a 5-6-mesh sieve. The preparation method of the internal absorption type quick-acting and slow-release fertilizer solves the problem of mixing failure of nitrate nitrogen and urea, improves fertilizer effects and avoids fertilizer interruption.

Description

technical field [0001] The invention relates to the technical field of fertilizers, in particular to an internal adsorption type quick-acting-slow-release compound fertilizer and a preparation method thereof. Background technique [0002] At present, with the development of agriculture, the development of compound fertilizers at home and abroad is dominant in the industry. At present, quick-acting-slow-release technology is also gradually applied to compound fertilizers, and ammonium-collecting nitrogen (NH4 + ) and amide nitrogen (containing -CO-NH-functional groups, such as urea, biuret) in one slow-release fertilizer to extend the release period of the fertilizer. However, there is a nutrient release gap period in this technology, which needs to be supplemented with nitrate nitrogen (nitrate or nitrite). However, the mixture of nitrate nitrogen and amide nitrogen will cause slurry reaction due to moisture absorption, and the fertilizer is easy to agglomerate during stor...

Claims

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Application Information

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IPC IPC(8): C05G3/00
CPCC05B1/04C05G3/00C05G5/30C05G3/20C05B7/00C05C1/00C05C3/00C05C5/02C05C9/00C05D5/00C05F11/02
Inventor李云利王福生安德刚董晓伟
Owner河北百禾丰化肥有限公司