Post-treatment method of granular fertilizer

A granular fertilizer and coating liquid technology, which is applied in the form of fertilizer, fertilizer mixture, fertilization device, etc., can solve the problems of high requirements for pre-coated materials, limited adhesion of pre-coated layer thickness, and limited improvement of substrate surface properties. , to achieve the effect of improved smoothness and roundness, less cost increase, and reduced roughness

Active Publication Date: 2010-03-03
CHINA NAT OFFSHORE OIL CORP +2
View PDF3 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned fertilizer surface pre-coating technology involves coating new substances on the fertilizer surface. First, there will be relatively high requirements for pre-coating materials. Second, the thickness of the pre-coating layer and the adhesion to the substrate are limited. Correspondingly Limited improvement of the surface properties of the substrate

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Post-treatment method of granular fertilizer
  • Post-treatment method of granular fertilizer
  • Post-treatment method of granular fertilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1, coating large granular urea

[0031] 1) Preparation of coating solution: Take 150g of water, preheat to 70-80°C, add 2.0g of carboxymethylcellulose sodium (CMC-Na), and then add 200g of urea to obtain a slightly viscous clear liquid; among them, The mass concentration of urea is 56.8%, and the mass concentration of CMC-Na is 0.56%.

[0032] 2) Weigh 4.0kg of 2.00-4.75mm large-grained urea provided by China BlueChemical Co., Ltd., and put it into a stainless steel drum with a diameter of 50 cm and 4 uniformly distributed lifting plates, and adjust the rotating speed of the drum so that the urea is in a good flow state. Preheat it to 60-70°C with an electric heater and keep it warm. Then, the coating solution was metered in by a peristaltic pump, and the amount of liquid added at one time was 63.5 g, and the time was about 30 seconds. After the coating solution is added, the surface of the particles is quickly wetted, and then dried quickly under the actio...

Embodiment 2

[0034] Embodiment 2, coating large granular urea

[0035] 1) Preparation of coating solution: Take 100g of water, preheat to 40°C, add 2.0g of modified starch (produced by Anhui Huainan Shanhe Pharmaceutical Excipients Co., Ltd.), and then add 75g of urea and 10g of ammonium nitrate to obtain a slightly viscous clarification Liquid; wherein, the mass concentration of urea and ammonium nitrate is 45.4%, and the mass concentration of modified starch is 1.1%.

[0036]2) Weigh 6.0kg of 2.00-4.75mm large granular urea provided by Zhonghai Chemical Company, put it into a stainless steel drum with a diameter of 50 cm and 4 uniformly distributed lifting plates, and adjust the rotating speed of the drum so that the urea is in a good flow state. Preheat it to 70°C with an electric heater and keep it warm. Then, the coating liquid is metered in by a peristaltic pump, and the amount of liquid added at one time is 45 g, and the time is about 30 seconds. After the coating solution is adde...

Embodiment 3

[0037] Embodiment 3, coating 15-15-15 potassium nitrosulfate type compound fertilizer

[0038] 1) Preparation of coating liquid: take 200 g of water, preheat to 80° C., and then add 500 g of ammonium nitrate to obtain a clear liquid; wherein, the mass concentration of ammonium nitrate is 71.4%.

[0039] 2) Weigh 4.0kg of 2.00-4.75mm 15-15-15 potassium nitrosulfate type compound fertilizer produced by China-Arab Fertilizer Company, put it into a stainless steel drum with a diameter of 50cm and 4 evenly distributed lifting plates, adjust The rotational speed of the drum makes the compound fertilizer in a good flow state. Preheat it to 80°C with an electric heater and keep it warm. Then, the coating liquid is metered into the coating liquid through a peristaltic pump, and the amount of liquid added at one time is 72 g, and the time is about 35 seconds. After the coating solution is added, the surface of the particles is quickly wetted, and then dried quickly under the action of...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a post-treatment method of granular fertilizer. The method includes the following steps: 1) preheating the granular fertilizer to certain temperature, placing the granular fertilizer in a revolving drum and causing the fertilizer granules to be in flow state; and 2) coating coating liquid on the surface of the granular fertilizer and then drying the granular fertilizer, wherein the solvent of the coating liquid is water, a solute comprises urea and / or ammonium nitrate and the mass concentration of the urea and / or the ammonium nitrate in the coating liquid is 30-80 percent; and the total coating quantity on the surface of the granular fertilizer is counted by dry basis and is 0.5-10 percent of the mass of the granular fertilizer. Through the treatment, the smoothnessand surface flatness of the granular fertilizer can be improved obviously under the precondition of not changing the nutrient content of fertilizer basically, thus obtaining smooth granular fertilizer core with high quality, further improving the nutrient release of coated controlled release fertilizer and reducing production cost.

Description

technical field [0001] The invention relates to a post-treatment method for the surface of granular fertilizer, through which the smoothness and roundness of granular fertilizer can be improved. Background technique [0002] Fertilizers, especially chemical fertilizers, are sources of nutrients necessary for crop growth. In recent years, the nutrient controlled release fertilizer technology has been developed rapidly, and the coating method is the main way to obtain controlled release fertilizers. [0003] Coating generally involves coating a new layer of water-blocking materials on the surface of inorganic fertilizers, including sulfur, resins, waxes, inorganic minerals, etc. In most cases, the price of the outer coating material is much higher than the wrapped fertilizer core, and we hope to consume as little film material as possible. There are various defects on the surface of the fertilizer, such as holes, irregularities, cracks, etc. Generally speaking, the coating a...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C05G5/00C05G3/00
Inventor茹铁军王金铭贲艳英
OwnerCHINA NAT OFFSHORE OIL CORP