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Production method of novel slow release urea-formaldehyde compound fertilizer

A production method and urea-formaldehyde technology are applied in the directions of urea compound fertilizer, nitrogen fertilizer, fertilization device, etc., to achieve the effect of less investment, smooth particles and good color and luster.

Active Publication Date: 2014-04-23
山东聊城鲁西化工第五化肥有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome above-mentioned deficiencies in the prior art, provide a kind of production method of novel chemically synthesized granular urea-formaldehyde sulfur-based compound fertilizer, this method is easy to implement, the product quality of gained is stable, can improve the nitrogen content of compound fertilizer And it is not easy to agglomerate, and nitrogen can be released according to different growth periods of crops. As the weather temperature rises, the ground temperature also rises, and the crops grow vigorously. Nitrogen-containing substances provide crop growth needs, meet the nitrogen demand of different crops in different growth periods, and improve the utilization rate of fertilizers

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  • Production method of novel slow release urea-formaldehyde compound fertilizer

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Effect test

Embodiment 1

[0034] The production method of the novel granular urea-formaldehyde sulfur-based compound fertilizer of the present embodiment is as follows:

[0035] (1) Potassium bisulfate solution is made by the reaction of 98% concentrated sulfuric acid and Repone K: 98% concentrated sulfuric acid refers to the concentrated sulfuric acid that mass concentration is 98%, 120 ℃ of concentrated sulfuric acid temperature, adding speed is 2.34 cubic / hours; Potassium chloride contains around 61% K 2 O, adding speed is 5 tons / hour. The mass-to-volume ratio of the potassium chloride added and the 98% concentrated sulfuric acid of reaction is potassium chloride: concentrated sulfuric acid=1000: 0.85 (kg: m 3 ).

[0036] (2) Potassium hydrogen sulfate solution is mixed with phosphoric acid to generate mixed acid slurry: the concentration of described phosphoric acid is 19.5%, and the density of potassium hydrogen sulfate solution is 1.70 g / ml, and potassium hydrogen sulfate solution is mixed wi...

Embodiment 2

[0049] The production method of the novel granular urea-formaldehyde sulfur-based compound fertilizer of the present embodiment is as follows:

[0050] (1) Potassium bisulfate solution is made by the reaction of 98% concentrated sulfuric acid and potassium chloride: the concentration of concentrated sulfuric acid is 98%, the temperature of concentrated sulfuric acid is 120 ° C, and the addition speed is 4.75 cubic / hour; potassium chloride contains about 61% K 2 O, adding speed is 10 tons / hour. The mass ratio of the added potassium chloride and 98% concentrated sulfuric acid is 1 ton of potassium chloride: 0.87 cubic concentrated sulfuric acid. (i.e. potassium chloride: concentrated sulfuric acid = 1000: 0.87 (kg: m 3 ))

[0051] (2) Potassium hydrogen sulfate solution is mixed with phosphoric acid to generate mixed acid slurry: the concentration of described phosphoric acid is 22%, and the density of potassium hydrogen sulfate solution is 1.50 g / ml, and potassium hydrogen su...

Embodiment 3

[0060] The production method of the novel granular urea-formaldehyde-based compound fertilizer of the present embodiment is as follows:

[0061] (1) Potassium bisulfate solution is made by the reaction of 98% concentrated sulfuric acid and potassium chloride: concentrated sulfuric acid concentration 98%, concentrated sulfuric acid temperature 120 ℃, adding speed is 2.74 cubic / hour; Potassium chloride contains about 61% K 2 O, adding speed is 6 tons / hour. The volume mass ratio of the potassium chloride added and the 98% vitriol oil of reaction is 1000: 0.83 (kg: m 3 ).

[0062] (2) Potassium hydrogen sulfate solution is mixed with phosphoric acid to generate mixed acid slurry: the concentration of described phosphoric acid is 20.0, and the density of potassium hydrogen sulfate solution is 1.50 g / ml, and potassium hydrogen sulfate solution is mixed with phosphoric acid to generate the density of mixed acid slurry was 1.39 g / ml.

[0063] (3) After pre-neutralizing the mixed ac...

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Abstract

The invention discloses a production method of a novel slow release urea-formaldehyde compound fertilizer, which comprises the following steps: (1) mixing a potassium hydrogen sulfate solution and phosphoric acid to generate mixed acid slurry; (2) ammoniating to pre-neutralize the mixed acid slurry, and then adding urea-formaldehyde slurry; (3) ammoniating to neutralize the obtained slurry, and granulating by carrying out atomization spray in a granulation device; and (4) after the granulation process, producing the required product by using the conventional technology. The product produced by using the method has uniform and stable quality, smooth particles, good color degree, high strength and obvious slow release effect, is white in color, is difficult to agglomerate, and can meet the nutrient demands of different crops at different growth periods, thereby ensuring that the nutrient release amounts are basically in agreement with the nutrient demands of the crops at different growth periods, and achieving better social and economic benefits.

Description

technical field [0001] The invention relates to a production method of a compound fertilizer, in particular to a production method of a new granular urea-formaldehyde sulfur-based compound fertilizer which is fast-acting, slow-release, long-acting and not easy to agglomerate. Background technique [0002] At present, general chemically synthesized compound fertilizers are produced by the reaction of phosphate rock and sulfuric acid to generate dilute phosphoric acid, and then mixed with potassium bisulfate, the reactant of potassium chloride and sulfuric acid, in a certain proportion to obtain mixed acid, which is then mixed with acid and ammonia in a neutralization reactor. After neutralization, the generated slurry enters the granulator for atomization and is sprayed onto the material curtain to form compound fertilizer particles. The compound fertilizer produced by this method has certain defects: that is, the nitrogen content is difficult to increase due to the limitation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G1/00C05C9/02
Inventor 陈运锋吕新春焦延涛王广辉王汝申玄先路张兴华陈春良
Owner 山东聊城鲁西化工第五化肥有限公司
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