Production method of tower type prilling slow release fertilizer

A slow-release fertilizer and granulation technology, applied in nitrogen fertilizer, fertilizer form, fertilization device and other directions, can solve the problems of not enough economy, the appearance of particles is not round enough, and the height of the tower can be reduced, so as to improve the utilization rate of fertilizer, the product is round and shiny, reduce the The effect of nitrogen loss

Active Publication Date: 2009-07-08
SHANGHAI RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The tower body of this method is too high, and the cost of each meter of the granulation tower is about 100,000, and the cost of 100 meters is about 10 million. For most small and medium-sized enterprises, the investment in the production of a single formula is too large to be worth the candle.
[0004] Chinese patent CN147380A discloses a new oil-cooled spray granulation process for producing compound fertilizers. Oil-cooled granulation consumes about 4% of the oil, which increases the production cost of the enterprise. In addition, the oil is applied to the Farmland has caused pollution to the soil. At present, few companies are using this method
[0005] Chinese patent (application number 2006101590915) discloses a kind of production method of high-tower slow-release compound fertili

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Take 240kg of solid urea, 50kg of formaldehyde solution with 40% concentration, stir and mix and heat to 60°C, mix with 340kg of monoammonium phosphate, 250kg of potassium chloride, gypsum powder (CaSO 4 ) 160kg mixed, and the mixed slurry is sprayed from the top of the tower together with 30kg of dilute sulfuric acid (20% concentration), the effective height of the tower is 40m, and the inner diameter of the tower is 10m, so that high-concentration granular nitrogen, phosphorus and potassium compound fertilizers are obtained. Contains N 15.00%, P 2 o 5 15.00%, K 2 O 15.00%. The particle strength of the product is greater than 30 Newton / particle.

Embodiment 2

[0028] Get 400kg of urea solution at the outlet of the urea secondary evaporator, the concentration is 99.7% by weight and 160kg, the concentration is 50% formaldehyde solution to mix, the mixed solution is then preheated to 50°C, 200kg of diammonium phosphorus after pre-crushing, Mix 300kg of potassium sulfate, 80kg of calcium carbonate powder, and 1.5kg of zinc sulfate. The mixed slurry is sprayed down from the top of the tower together with 20kg of dilute sulfuric acid (30% concentration). The effective height of the tower is 60m, and the inner diameter of the tower is 20m. The compound fertilizer of nitrogen, phosphorus and potassium, the specification of which is N-P 2 o 5 -K 2 O=22-9-15, the particle strength of the product is greater than 40 Newton / particle. The compound fertilizer can be used as a special fertilizer for tobacco, and the application effect is obvious.

Embodiment 3

[0030] Take 200kg of urea solution at the outlet of the second-stage evaporator of the urea plant, with a concentration of 95.0% by weight, mix it with 40kg of formaldehyde solution with a concentration of 45%, and then mix it with 100kg of monoammonium phosphate preheated to 80°C, 400kg of general calcium, and potassium sulfate 200kg, 100kg of dolomite and 3kg of borax are mixed, and the mixed slurry and 10kg of dilute sulfuric acid (40% concentration) are sprayed from the top of the tower with a height of 40m to obtain a medium-concentration granular nitrogen, phosphorus, and potassium compound fertilizer. Product specifications for N-P 2 o 5 -K 2 O=10-10-10, the particle strength of the product is greater than 40 Newton / particle.

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Abstract

The invention relates to a method for making a slow-release fertilizer through tower granulation, which comprises: heating and mixing solid urea or a urea solution and a formaldehyde solution to form mixed slurry, wherein the mol ratio of the urea to formaldehyde is 1-8:1, and the temperature of the mixed slurry is between 40 and 80 DEG C; mixing a phosphorus fertilizer preheated to a temperature of between 50 and 80 DEG C, one or more selected from a nitrogenous fertilizer, a potassium fertilizer or solid filler, and a urea-formaldehyde solution; and adding a small amount of dilute sulfuric acid solution into the mixed slurry, spraying the mixed slurry from the top of a tower, and making the granular compound fertilizer. The method utilizes the principle that condensation reaction of the urea and the formaldehyde in an acid solution is exothermic reaction to achieve the aim of flash evaporation of moisture, reduces the height of the granulation tower, simultaneously reduces the temperature of the mixed slurry, and can produce composite fertilizers with various formulas. The compound fertilizer is slowly released and difficult to agglomerate.

Description

technical field [0001] The invention relates to a method for manufacturing slow-release fertilizers by tower granulation, in particular to a method for manufacturing nitrogen-containing or nitrogen-phosphorus or nitrogen-phosphorus-potassium slow-release fertilizers by tower granulation. Background technique [0002] In recent years, tower granulation has been rapidly popularized in my country due to its good sphericity, good surface gloss and high yield. However, because this method is limited to high nitrogen, the production formula is limited, and it can only produce high nitrogen, low phosphorus and medium potassium, which is not suitable for the needs of most enterprises in my country to produce multiple formulas. [0003] Chinese patent CN1546441A discloses a method for manufacturing compound fertilizer by tower granulation of molten slurry, the melting temperature is (130°C-145°C), and the tower height is 60m-100m. At such a high granulation temperature, the residenc...

Claims

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Application Information

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IPC IPC(8): C05G1/00C05G5/00C05C9/00
CPCY02P60/21
Inventor 朱东明杨焕银曹卫宇陈明良梁济段立松葛建国张伟
Owner SHANGHAI RES INST OF CHEM IND
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