CN104140345A - Preparing method of urea formaldehyde controlled-release compound fertilizer by urea fusion production - Google Patents
Preparing method of urea formaldehyde controlled-release compound fertilizer by urea fusion production Download PDFInfo
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- CN104140345A CN104140345A CN201310162229.0A CN201310162229A CN104140345A CN 104140345 A CN104140345 A CN 104140345A CN 201310162229 A CN201310162229 A CN 201310162229A CN 104140345 A CN104140345 A CN 104140345A
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Abstract
The invention relates to the field of compound fertilizers and provides a preparing method of a urea formaldehyde controlled-release compound fertilizer by urea fusion production. The preparing method is characterized in that: urea and formaldehyde are adopted as raw materials for synthesis of urea formaldehyde; the process includes a step of urea formaldehyde synthesis by fully-automatic urea fusion and a step of spraying pulp and granulating; the urea, a certain amount of the formaldehyde and a small amount of water are added into a mixer; under stirring, a fusion state in which the urea is the main component is formed by indirect heating; a proper ratio of the formaldehyde and 5% of water are added during urea fusion; steam is utilized for indirect heating; the temperature is 110-125 DEG C; and a urea liquid containing a certain amount of the urea formaldehyde is formed by polymerization under the catalytic function of aqueous ammonia. By adoption of the technical scheme, after the urea formaldehyde controlled-release compound fertilizer is applied into the soil, the urea formaldehyde rapidly fuses into colloid and is tightly adsorbed and mixed with the soil, thus guaranteeing no nutrient loss for a long term, reducing the using amount of the fertilizer and reducing pollution of the fertilizer to rivers and lakes.
Description
Technical field
The present invention relates to composite fertilizer field, is a kind of method that urea melting is produced urea formaldehyde slow-release compound fertilizer of preparing.
Background technology
Generally, the nitrogenous source in Chemical Mixed Fertilizer be take urea and ammonium chloride as main.Because chloride ion content is high in ammonium chloride, easily cause the hardening soil, the volatility of ammonium chloride is high on the other hand, its effective rate of utilization less than 30%.Urea is a kind of high density nitrogenous fertilizer, belongs to neutral readily avaiable fertilizer, also can be used for producing multiple compound manure.Not residual any objectionable impurities in soil, long-term application does not have detrimentally affect.So in selecting the raw material of Chemical Mixed Fertilizer, urea is better than ammonium chloride.
The release validity period of the nitrogen in conventional Chemical Mixed Fertilizer, phosphorus, potassium is about 100 days, and plant growth time major part is more than 120 days, therefore, forms disappearance and requires to supplement, particularly nitrogen element at some fertilizer of later stage.
Urea formaldehyde slow-release compound fertilizer applies behind soil, and urea formaldehyde melts and merged by soil adsorbed close for colloid fast, thereby guarantees that nutrient does not run off for a long time.Urea divides and takes off and can be converted in microorganism in a short time, and the inorganic nitrogen that crop directly absorbs discharges nutrient fast, forms the quick-acting compositions (10 to 40 days) in urea-formaldehyde fertilizer; Urea formaldehyde must be through for a long time, repeatedly the decomposing and just can be converted into the absorbable inorganic nitrogen of crop of microorganism, so just formed the long-acting composition in urea-formaldehyde fertilizer (80 to 120 days).
Reduce the consumption of fertilizer simultaneously, reduced the pollution of fertilizer to rivers and lakes.
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Summary of the invention
The present invention aims to provide a kind of method that urea melting is produced urea formaldehyde slow-release compound fertilizer of preparing, and to simplify urea formaldehyde production of compound fertilizer technique, improves utilization rate of fertilizer, reduces environmental pollution, reduces the number of times that topdresses, and reduces agricultural cost.
Technical scheme of the present invention is: it is characterized in that, take urea and formaldehyde as the synthetic urea formaldehyde of raw material, technique is the synthetic urea formaldehyde of full-automatic urea melting and spray granulating two steps, urea and a certain amount of formaldehyde and a small amount of water are added to mixing tank, under mechanical stirring, indirect heating forms take urea as main molten state, during urea melting, drop into the formaldehyde of appropriate proportioning and 5% water, use steam indirect heating, temperature is 110-125 ℃, and under ammonia-catalyzed effect, polymerization obtains the urine that contains a certain amount of urea formaldehyde; The feed liquid of molten state is delivered to tablets press through transport pipe and is sprayed in tablets press and pulverize other fertilizer and the additive mixing granulations such as phosphorus, potassium through a plurality of nozzles, then drying, the cooling product that obtains.
Owing to adopting technique scheme, urea formaldehyde slow-release compound fertilizer applies behind soil, and urea formaldehyde melts and merged by soil adsorbed close for colloid fast, thereby guarantees that nutrient does not run off for a long time.Urea formaldehyde must be through for a long time, repeatedly the decomposing and just can be converted into the absorbable inorganic nitrogen of crop of microorganism, so just formed the long-acting composition in urea-formaldehyde fertilizer (80 to 120 days).Reduce the consumption of fertilizer simultaneously, reduced the pollution of fertilizer to rivers and lakes.
Embodiment
Below in conjunction with embodiment, the present invention is further illustrated.
Embodiment 1: full-automatic urea melting is produced urea formaldehyde slow-release compound fertilizer, and raw material consists of urea 430kg, formaldehyde 10kg, Repone K 100kg, monoammonium phosphate 125kg, carbon ammonium 25kg, ammonium chloride 250kg, amendment 70kg.
The water that adds formaldehyde and 5% during appropriate urea melting, by steam indirect heating, to 110-125 ℃, under ammonia-catalyzed effect, polymerization obtains the urine that contains a certain amount of urea formaldehyde.By automatic control system, automatically adjusted the flow of urine; urine through fusion tank melting; by Melting pump, be forced into 0.3MPa; by 4 special nozzles, along axial line, become 35 ° of angular direction to be sprayed onto on the pulverulent material of nitrogenous fertilizer, phosphate fertilizer and potash fertilizer in tablets press with vertical direction; in tablets press, cause particle; pass through dram, cooling cylinder, final sizing becomes the urea formaldehyde slow-release compound fertilizer particle of qualified 28-6-6 proportioning again.
Embodiment 2: full-automatic urea melting is produced urea formaldehyde slow-release compound fertilizer, and raw material consists of urea 374kg, formaldehyde 2kg, Repone K 320kg, monoammonium phosphate 160kg, carbon ammonium 16kg, unslaked lime 20kg, amendment 126kg.
The water that adds formaldehyde and 5% during appropriate urea melting, by steam indirect heating, to 110-125 ℃, under ammonia-catalyzed effect, polymerization obtains the urine that contains a certain amount of urea formaldehyde.By automatic control system, automatically adjusted the flow of urine; urine through fusion tank melting; by Melting pump, be forced into 0.3MPa; by 4 special nozzles, along axial line, become 35 ° of angular direction to be sprayed onto on the pulverulent material of nitrogenous fertilizer, phosphate fertilizer and potash fertilizer in tablets press with vertical direction; in tablets press, cause particle; pass through dram, cooling cylinder, final sizing becomes the urea formaldehyde slow-release compound fertilizer particle of qualified 19-7-19 proportioning again.
Claims (1)
1. prepare the method that urea melting is produced urea formaldehyde slow-release compound fertilizer for one kind, it is characterized in that, take urea and formaldehyde as the synthetic urea formaldehyde of raw material, technique is the synthetic urea formaldehyde of full-automatic urea melting and spray granulating two steps, urea and a certain amount of formaldehyde and a small amount of water are added to mixing tank, under mechanical stirring, indirect heating forms take urea as main molten state, during urea melting, drop into the formaldehyde of appropriate proportioning and 5% water, use steam indirect heating, temperature is 110-125 ℃, and under ammonia-catalyzed effect, polymerization obtains the urine that contains a certain amount of urea formaldehyde; The feed liquid of molten state is delivered to tablets press through transport pipe and is sprayed in tablets press and pulverize other fertilizer and the additive mixing granulations such as phosphorus, potassium through a plurality of nozzles, then drying, the cooling product that obtains.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310162229.0A CN104140345A (en) | 2013-05-07 | 2013-05-07 | Preparing method of urea formaldehyde controlled-release compound fertilizer by urea fusion production |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310162229.0A CN104140345A (en) | 2013-05-07 | 2013-05-07 | Preparing method of urea formaldehyde controlled-release compound fertilizer by urea fusion production |
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| CN104140345A true CN104140345A (en) | 2014-11-12 |
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| CN201310162229.0A Pending CN104140345A (en) | 2013-05-07 | 2013-05-07 | Preparing method of urea formaldehyde controlled-release compound fertilizer by urea fusion production |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104909881A (en) * | 2015-05-27 | 2015-09-16 | 深圳市芭田生态工程股份有限公司 | Additive for preventing potassium fertilizer from powder generation, and application method thereof |
| CN104945070A (en) * | 2015-07-09 | 2015-09-30 | 史丹利化肥（平原）有限公司 | Energy-saving production technology and device for urea-based compound fertilizer |
| CN108821846A (en) * | 2018-06-01 | 2018-11-16 | 山东农业大学 | A kind of high molecular slow-release fertilizer using gutter oil synthesis |
| CN117430471A (en) * | 2023-10-23 | 2024-01-23 | 嘉施利（应城）化肥有限公司 | Urine-based slow-release compound fertilizer generated by high tower granulation process and preparation method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104909881A (en) * | 2015-05-27 | 2015-09-16 | 深圳市芭田生态工程股份有限公司 | Additive for preventing potassium fertilizer from powder generation, and application method thereof |
| CN104945070A (en) * | 2015-07-09 | 2015-09-30 | 史丹利化肥（平原）有限公司 | Energy-saving production technology and device for urea-based compound fertilizer |
| CN108821846A (en) * | 2018-06-01 | 2018-11-16 | 山东农业大学 | A kind of high molecular slow-release fertilizer using gutter oil synthesis |
| CN117430471A (en) * | 2023-10-23 | 2024-01-23 | 嘉施利（应城）化肥有限公司 | Urine-based slow-release compound fertilizer generated by high tower granulation process and preparation method thereof |
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Application publication date: 20141112 |