Preparation for coating material containing phosphate fertilizer and coating method thereof

A technology of coating and phosphate fertilizer, which is applied in the field of preparation of slow-release phosphate-containing fertilizers, can solve problems such as difficult and complex processes, and achieve the effects of increased strength, low cost, and simple modification treatment methods

Inactive Publication Date: 2008-09-24
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this technology, polymer material polyacrylic acid is connected to the attapulgite structure, which is complicated and difficult.

Method used

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  • Preparation for coating material containing phosphate fertilizer and coating method thereof
  • Preparation for coating material containing phosphate fertilizer and coating method thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0023] Take 1000 grams of naturally differentiated attapulgite clay of about 200 mesh, add enough mass ratio of 2-3% sodium carbonate aqueous solution to soak and age for about 48 hours, then stir with a mechanical stirrer for 1-2 hours, filter and separate Take out the attapulgite, wash it with water for 2 to 3 times, then dry it and grind it finely. It is determined that the viscosity of the treated attapulgite is 15-20% higher than that of the non-modified one.

example 2

[0025] Take 1,000 grams of naturally differentiated attapulgite of about 200 meshes, add sufficient mass ratio of 6-10% phosphoric acid aqueous solution, soak for 2-4 hours, filter, wash with water for 2-3 times, and then dry it and finely ground. The treated attapulgite material is slow-release due to its structural characteristics. It is determined that the viscosity of the modified attapulgite is 11-18% higher than that of the non-modified one.

[0026] Preparation of Slow Release Phosphate Fertilizer

[0027] Sieve the diammonium phosphate with 8 mesh and wire mesh with a hole diameter of 3.50mm to remove coarse or fine particles, take 1000 grams of diammonium phosphate with a particle size of 2.50-3.50mm, and pour it into a drum coating machine. Adjust the inclination angle of the coating machine so that the diammonium phosphate rotates evenly in the drum in the form of a material curtain; adjust the angle of the airflow atomizer so that the axis of the nozzle is perpen...

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Abstract

The present invention discloses a preparation method of a slow-release phosphorus fertilizer, and a preparation method that is used for a coating material that is used for the slow-release phosphorus fertilizer. The slow-release phosphorus fertilizer is a coated fertilizer that is coated by a coating outside the phosphorus fertilizer; the coating material is made of improved attapulgite. For the improvement of the attapulgite, the attapulgite is improved by dipping the aqueous solution of sodium carbonate or phosphoric acid; then the improved attapulgite is separated, dried and milled for dispersion.

Description

technical field [0001] The invention relates to a preparation method of a slow-release phosphorus-containing fertilizer and a preparation method of a coating material used in the preparation of the slow-release phosphorus fertilizer. The slow-release phosphate fertilizer involved in the present invention is a coated phosphate fertilizer coated with a coating on the outside of the phosphate fertilizer, and the used coating material is attapulgite. Background technique [0002] Fertilizers are indispensable in agricultural production, and the use of chemical fertilizers has become more common, and the amount of use is increasing year by year. However, due to improper use, the utilization rate of chemical fertilizers is low, which brings huge economic losses to agriculture, and also brings some environmental problems. Modern fertilizers should take on the important task of protecting the ecological environment entrusted by fertilizer science. It is the development direction of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
Inventor 张国林刘伟生蔺海明曹发魁宋颖
Owner LANZHOU UNIVERSITY
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