Production process of urea formaldehyde synergistic compound fertilizer

A production process and urea-formaldehyde technology, applied in the field of compound fertilizers, can solve the problems of inability to achieve controlled nutrient release, P and K leaching loss, and low granulation rate, and achieve increased microbial mineral decomposition and polysaccharide secretion, slowing The effect of enhancing the release effect and promoting the growth of crops

Inactive Publication Date: 2018-09-04
拉多美(宁陵)化肥有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Existing urea-formaldehyde slow-release fertilizers still have disadvantages such as low granulation rate, serious dust loss, high filler cost, easy caking, inability to achieve nutrient controlled release, serious P and K leaching losses, etc., so research and development do not require coating, The urea-formaldehyde production process with high granulation rate, not easy to agglomerate, low cost, high fertilizer efficiency, and controllable release of N, P, and K nutrients is of great significance

Method used

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  • Production process of urea formaldehyde synergistic compound fertilizer
  • Production process of urea formaldehyde synergistic compound fertilizer
  • Production process of urea formaldehyde synergistic compound fertilizer

Examples

Experimental program
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Effect test

Embodiment 1

[0028] A kind of urea-formaldehyde synergistic compound fertilizer production process, comprises the following steps:

[0029] 1. Add urea to formaldehyde solution, the molar ratio of urea to formaldehyde is 1.3:1, heat to dissolve, add sodium hydroxide to adjust the pH value to 7.0-7.5, keep the temperature at 40-60°C, add reaction for 1 hour, and obtain methylol urea solution;

[0030] 2. Add industrial sulfuric acid or phosphoric acid to the hydroxymethyl urea solution, adjust the pH value to 4.0-4.5, stir, and condense for 1 hour to obtain a urea-formaldehyde solution for later use;

[0031] 3. Weigh urea, diammonium phosphate, and potassium chloride, add water to dissolve, stir evenly, add bentonite and stir to form an emulsion, then add sodium carboxymethyl cellulose, continue stirring until completely dissolved, add a cross-linking agent to react, and obtain a composite water Gel microspheres are washed with water and dried to constant weight to obtain gel materials, w...

Embodiment 2

[0038] A kind of urea-formaldehyde synergistic compound fertilizer production process, comprises the following steps:

[0039] 1. Add urea to formaldehyde solution, the molar ratio of urea to formaldehyde is 1.3-1.6:1, heat to dissolve, add sodium hydroxide to adjust the pH value to 7.0-7.5, keep the temperature at 40-60°C, add reaction for 1 hour, and obtain methylol urea solution;

[0040] 2. Add industrial sulfuric acid or phosphoric acid to the hydroxymethyl urea solution, adjust the pH value to 4.0-4.5, stir, and condense for 1 hour to obtain a urea-formaldehyde solution for later use;

[0041] 3. Weigh urea, diammonium phosphate, and potassium chloride, add water to dissolve, stir evenly, add bentonite and stir to form an emulsion, then add sodium carboxymethyl cellulose, continue stirring until completely dissolved, add a cross-linking agent to react, and obtain a composite water Gel microspheres are washed with water and dried to constant weight to obtain gel material...

Embodiment 3

[0048] A kind of urea-formaldehyde synergistic compound fertilizer production process, comprises the following steps:

[0049] 1. Add urea to formaldehyde solution, the molar ratio of urea to formaldehyde is 1.3-1.6:1, heat to dissolve, add sodium hydroxide to adjust the pH value to 7.0-7.5, keep the temperature at 40-60°C, add reaction for 1 hour, and obtain methylol urea solution;

[0050] 2. Add industrial sulfuric acid or phosphoric acid to the hydroxymethyl urea solution, adjust the pH value to 4.0-4.5, stir, and condense for 1 hour to obtain a urea-formaldehyde solution for later use;

[0051] 3. Weigh urea, diammonium phosphate, and potassium chloride, add water to dissolve, stir evenly, add bentonite and stir to form an emulsion, then add sodium carboxymethyl cellulose, continue stirring until completely dissolved, add a cross-linking agent to react, and obtain a composite water Gel microspheres are washed with water and dried to constant weight to obtain gel material...

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Abstract

The invention discloses a production process of a urea formaldehyde synergistic compound fertilizer. According to the production process, bentonite compound hydrogel packaging urea, diammonium phosphate and potassium chloride is taken as a solid material, urea formaldehyde is sprayed to the solid material for granulation, charcoal and a microbial agent are added in powder applying manner, so thatthe double-control release of a nitrogen fertilizer and the controllable release of a phosphorus fertilizer and a potassium fertilizer can be realized, and the activity of the microbial agent is improved. Compared with existing products, the product prepared by virtue of the production process provided by the invention has the advantages that the particle size is uniform, dust is little, the appearance is mellow and full, the agglomeration does not easily occur, nutrients are uniformly released, the period is long, the loss does not easily occur, the complete release is realized, the utilization rates of fertilizers N, P and K are increased, and the relatively high validity of the nutrients including nitrogen, phosphorus and potassium is maintained in each growth period of crops; and the product can be completely decomposed by microorganisms, does not have residue and is environmentally friendly, capable of improving microbial florae of soil and preventing hardening and accordant withthe requirements on the development of green ecological agriculture.

Description

technical field [0001] The invention relates to the technical field of compound fertilizers, in particular to a production process for urea-formaldehyde synergistic compound fertilizers. Background technique [0002] At present, my country consumes 32% of the world's total chemical fertilizers with 9% of the world's land, and the amount of fertilizer per unit area is more than three times the world's average level. The nutrient utilization rate of chemical fertilizers has always been low. Only 30% to 35%, phosphate 10% to 25%, potash 35% to 50%. Due to improper fertilization and low fertilizer utilization rate, a large amount of chemical fertilizers are lost, resulting in huge waste of resources, economic losses and serious environmental pollution, so it is urgent to improve fertilizer utilization rate. [0003] Slow-release fertilizers can effectively control the release rate of nutrients, prolong the period of fertilizer effectiveness, maximize the utilization rate of fert...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G3/04C05G3/08C05G3/80C05G3/90
CPCC05B7/00C05G3/00C05G3/80C05G3/90C05G5/12C05C9/00C05C9/02C05D1/02C05D9/00C05F11/08Y02A40/22Y02P60/21
Inventor 王晓春罗冬贵蒋振华刘仁军
Owner 拉多美(宁陵)化肥有限公司
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