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Double-control composite slow-release fertilizer and method for preparing same

A slow-release fertilizer and compound technology, which is applied in fertilizer mixtures, fertilization devices, applications, etc., can solve the problems of unsatisfactory slow-release effect of cemented slow-release fertilizers, reduce secondary environmental pollution, be easy to operate, and improve fertilizer The effect of utilization

Active Publication Date: 2006-09-06
SOIL & FERTILIZER INST CHINESE ACAD OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The slow-release effect of cemented slow-release fertilizers is often not ideal

Method used

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  • Double-control composite slow-release fertilizer and method for preparing same
  • Double-control composite slow-release fertilizer and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Take 27kg of urea, 18kg of monoammonium phosphate, 15kg of potassium sulfate, 30kg of weathered coal humic acid, 10kg of phosphate rock powder, crush them through a 60-70 mesh sieve, and mix 60kg of nitrogen, phosphorus, and potassium fertilizer raw materials with 30kg of weathered coal humic acid Mix well, and add about 10±2kg of water to make the raw material mixture have a certain humidity; the raw material mixture is granulated in a granulating disc machine; the granulated material is sent to a rotary drying drum for drying; After the powder and large particles larger than 5mm are sieved, they are all used as returned materials and recycled; add 10kg of phosphate rock powder to the disc granulator for particles larger than 2mm but smaller than 5mm, roll and coat them, dry or Air-dried is the finished product.

Embodiment 2

[0028] Take 20kg of urea, 26kg of monoammonium phosphate, 21kg of potassium sulfate, 23kg of weathered coal humic acid, 10kg of calcium-magnesium phosphate fertilizer, crush them through a 60-70 mesh sieve, and mix 67kg of nitrogen, phosphorus, and potassium fertilizer raw materials and 13kg of weathered coal humic acid Mix well, and add about 10±2kg of water to make the raw material mixture have a certain humidity; the raw material mixture is granulated in a granulating disc machine; the granulated material is sent to a rotary drying drum for drying; After the powder and large particles larger than 5mm are sieved, they are all used as returned materials for recycling; add 10kg of calcium magnesium phosphate fertilizer to the disc granulator for particles larger than 2mm but smaller than 5mm, roll and coat them, dry or Air-dried is the finished product.

Embodiment 3

[0030] Take 27kg of urea, 18kg of calcium phosphate, 15kg of potassium sulfate, 30kg of weathered coal humic acid, 10kg of calcium-magnesium phosphate fertilizer, pass through a 60-70 mesh sieve after crushing, and fully mix 60kg of nitrogen, phosphorus, and potassium fertilizer raw materials and 30kg of weathered coal humic acid. Mix well, and add about 10±2kg of water to make the raw material mixture have a certain humidity; the raw material mixture is granulated in a granulating disc machine; the granulated material is sent to the rotary drying drum for drying; the powder smaller than 2mm After sieving, the granules larger than 5mm and larger than 5mm are used as returned materials for recycling; add 10kg of calcium magnesium phosphate fertilizer to the disc granulator for particles larger than 2mm but smaller than 5mm, roll and coat them, and dry or air-dry , which is the finished product.

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Abstract

The present invention discloses a composite type of slow-release fertilizer with double control and its method for making. The said composite type of slow-release fertilizer with double control which comprises fertilizing materials of nitrogen, phosphor and kalium, cementing and bonding materials of agenthumic acid in weathered coal and clad materials is obtained by passing a screen of 60-70 meshes, mixing, pelleting, drying, bolting and cladding the said meterials. The invention adopts a measure of slow-release fertilizer wrapping slow-release fertilizer, enhances the slow-release effect and the availability ratio (10-15 %) of the fertilizer, releases slowly according to the nutrient need for the crops, simplifies the cropping agro-operation and derates the secondary environmental pollution, so it is an organic and inorganic composite type of slow-release fertilizer with multicomponent and multiple function; it is characterized in that it is of easy making technology and operation, low productive investment and cost, broad sources for stocks, high mechanical strength(>=12 N) of particles of fertilizer, no slaking, convenient transport and use, so its application prospect is broad in the production.

Description

technical field [0001] The invention relates to a fertilizer and a preparation method thereof, in particular to a coated and cemented double-control organic composite slow-release fertilizer and a preparation method thereof. Background technique [0002] At present, there are mainly two types of coating materials used in coated slow-release fertilizers developed at home and abroad, one is organic polymers (such as resin polyolefins), and the other is water-insoluble or slightly soluble inorganic materials ( Such as sulfur, phosphate rock powder, calcium magnesium phosphate fertilizer, etc.). The production of polymer-coated slow-release fertilizers requires special coating towers and solvents. The coating materials are expensive, and the production process costs are relatively high. The coating materials decompose slowly in the soil and tend to remain. However, the controlled release performance of polymeric materials is better. Polymer-coated slow-release fertilizers are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G1/00
Inventor 赵秉强李燕婷李秀英李小平王丽霞
Owner SOIL & FERTILIZER INST CHINESE ACAD OF AGRI SCI
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